JP2005306227A - Cooling device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform stable cooling with a heat exchanger for cooling on the ceiling side without diverting a refrigerant. <P>SOLUTION: This cooling device 1 for a vehicle includes a plurality of heat exchangers 41 and 45 for refrigeration, and is mounted to the vehicle V. The cooling device 1 comprises a primary cycle 3 constituting a freezing cycle for circulating the refrigerant, a secondary cycle 5 constituting a circulation cycle for circulating a liquid refrigerant, and a chiller heat exchanger 15 for heat-exchanging the refrigerant circulating through the primary cycle 3 and the liquid refrigerant circulating through the secondary cycle 5 as a common component of the primary cycle 3 and the secondary cycle 5. At least one heat exchanger 41 of the plurality of heat exchangers 41 and 45 is arranged as a component of the secondary cycle 5 on the ceiling of the vehicle V. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cooling apparatus for a vehicle provided with a cooling air outlet, for example, near a ceiling.

  In a vehicle cooling device, as a method of reducing the feeling of wind speed during cooling, so-called mild flow is generally performed in which each cooling air is reduced (mild) by blowing out cooling air using a large number of air outlets. It has been broken.

  However, when the amount of cooling air is small in this mild flow system, there is a possibility that the wind speed is too low and knee cooling or the like may occur, and a countermeasure has been desired.

  Therefore, as a countermeasure for cooling the knee, a vehicle cooling device of a type in which an outlet is installed near the ceiling is known.

  For example, in the vehicle cooling device disclosed in Patent Document 1, a cooling air blowing duct extends from the air conditioner in the instrument panel on the front side of the passenger compartment to the vicinity of the ceiling, and the cooling air sent from the air conditioner. Is guided to the vicinity of the ceiling through the duct and blown into the passenger compartment.

Further, for example, in the cooling apparatus for a vehicle disclosed in Patent Document 2, a cooling unit (evaporator and blower) separate from a cooling unit including a refrigeration cycle including an evaporator installed on the front side (front side) of the vehicle, for example. Ambient air that is installed near the ceiling, diverts the refrigerant from the vehicle front side cooling unit, supplies it to the ceiling evaporator as a reduced pressure refrigerant, evaporates the refrigerant by the heat absorption of the evaporator, and is cooled by the evaporation (heat absorption) Is blown into the passenger compartment through the blower.
JP 2001-341518 A JP 11-157330 A

  However, in the configuration disclosed in the former publication, it is necessary to extend the duct from the instrument panel side in front of the vehicle to the ceiling, but the installation of the duct having a passage area capable of blowing a desired amount of cooling air in the vehicle interior It was very difficult to secure a space, and it was difficult to set a sufficient amount of cooling air blown from the ceiling.

  Further, in the configuration disclosed in the latter publication, the refrigerant on the cooling unit side is divided and supplied to the evaporator on the ceiling side. For this reason, at the time of refrigerant diversion, the cooling power on the cooling unit side changes due to a change in the refrigerant supply amount to the ceiling evaporator, and the cooling effect by this cooling unit may be reduced, and the direct temperature distribution of the evaporator deteriorates There was fear.

  The present invention has been made in consideration of the above-described conventional problems, and provides a vehicle cooling apparatus that can perform stable cooling by a ceiling-side cooling heat exchanger without diverting refrigerant. The purpose is to do.

  The invention described in claim 1 is a vehicular cooling device that includes a plurality of cooling heat exchangers and is mounted on a vehicle, the primary cycle constituting a refrigeration cycle for circulating the refrigerant, and the circulation of the liquid refrigerant A chiller heat exchanger that exchanges heat between the refrigerant that circulates in the primary cycle and the liquid refrigerant that circulates in the secondary cycle. The at least one cooling heat exchanger among the plurality of cooling heat exchangers is disposed on the ceiling of the vehicle as a component of the secondary cycle.

  The invention according to claim 2 is characterized in that the liquid refrigerant is circulated using at least one other cooling heat exchanger among the plurality of cooling heat exchangers as a component of the secondary cycle. .

  According to the first aspect of the present invention, the chiller heat exchanger exchanges heat between the refrigerant circulating in the primary cycle and the liquid refrigerant circulating in the secondary cycle including the cooling air blowing unit disposed on the ceiling side. Therefore, the liquid refrigerant on the secondary cycle side can be cooled without circulating the refrigerant on the primary cycle side to the secondary cycle side.

  Accordingly, the liquid refrigerant cooled by the heat exchanging function of the chiller heat exchanger is cooled by the cooling heat exchanger on the ceiling side without diverting the refrigerant circulating in the primary cycle, thereby stably cooling the vehicle interior. Wind can be blown.

  According to invention of Claim 2, each heat exchanger for cooling can be reduced in size compared with the case where a gaseous refrigerant is used, for example.

  Hereinafter, the present invention will be specifically described with reference to an embodiment illustrated in the drawings.

  FIG. 1 is a perspective view showing a schematic configuration of a vehicle cooling apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a refrigeration cycle configuration of the vehicle cooling apparatus shown in FIG. As shown in FIGS. 1 and 2, the vehicle cooling device 1 includes a refrigerant circulation primary cycle (refrigeration cycle) 3 mounted on the front side (front side) of the vehicle V, for example, on the front side of the instrument panel. And a secondary cycle for circulating the cooling water attached from the front side of the vehicle V to the vicinity of the ceiling.

  That is, as shown in FIG. 1, the primary cycle 3 includes an external heat exchanger (condenser) 7 installed on the front side of the vehicle of the fan F and the radiator R for cooling the engine E, and the external heat exchanger 7. An adiabatic expansion orifice 11 connected to the refrigerant pipe 9 through the refrigerant pipe 9, a refrigerant circulation type chiller heat exchanger 15 connected to the orifice 11 through the refrigerant pipe 13, and the chiller heat exchanger 15 And a refrigerant storage reservoir 19 (not shown in FIG. 1) connected to the reservoir 19 via a refrigerant pipe 17, and a compressor 23 connected to the reservoir 19 via a refrigerant pipe 21. The compressor 23 is connected to the external heat exchanger 7 via the refrigerant pipe 25, thereby constituting a refrigeration cycle.

  On the other hand, the secondary cycle 5 is a circulation cycle in which cooling water used for cooling the engine E by the radiator R, for example, is circulated, part of which is the front side of the instrument panel and the rest is the front pillar (A pillar). ) It is installed on the ceiling side through FP.

  That is, the secondary cycle 5 is installed on the front side of the instrumental panel, and is installed on the front side of the instrument panel and the reservoir 31 for accumulating cooling water for engine cooling, and is connected to the reservoir 31 via the water pipe 33. A chiller heat exchanger 15 that is connected and shared with the primary cycle 3 is provided.

  In other words, the chiller heat exchanger 15 performs heat exchange between the refrigerant flowing in the primary cycle 3 and the cooling water flowing in the secondary cycle 5.

  The secondary cycle 5 is installed on the front side of the instrumental panel, and is connected to the compressor 37 connected to the chiller heat exchanger 15 via the water pipe 35, and connected to the compressor 37 and forwards. A water pipe 39 installed in the left front pillar FP1 and a ceiling side heat exchanger 41 connected to the water pipe 39 and mounted near the ceiling of the vehicle V are provided.

  Further, the secondary cycle 5 is connected to the ceiling-side heat exchanger 41 and is connected to the water pipe 43 installed in the front pillar FP2 on the right side toward the front, and to the water pipe 43, and the instrumental panel. A front-side heat exchanger 45 installed on the front side, and this front-side heat exchanger 45 is connected to the reservoir 31 via a water pipe 47 to constitute a cooling water circulation cycle. The front side heat exchanger 45 is disposed in a flow path of air flowing into the vehicle interior.

  Further, as shown in FIG. 2, the secondary cycle 5 is provided in the middle of the bypass pipe 49 and a bypass pipe 49 for bypassing the ceiling side heat exchanger 41 connecting the water pipe 39 and the water pipe 43. And an electromagnetic valve 51 for opening and closing the bypass pipe.

  Next, the operation of this embodiment will be described.

  During operation of the vehicle cooling device 1 according to the present embodiment, in the primary cycle 3, the refrigerant that has flowed through the refrigerant pipe 25 by the operation of the compressor 23 is condensed in the external heat exchanger 7, and the condensed high-pressure refrigerant is Then, the refrigerant flows into the orifice 11 through the refrigerant pipe 9 and is adiabatically expanded by passing through the orifice 11 to become low-temperature and low-pressure and flows into the chiller heat exchanger 15.

  On the other hand, in the secondary cycle 5, the solenoid valve 51 is in a closed state, and the cooling water (heated cooling water after cooling of the engine E) that flows out of the reservoir 31 by driving the compressor 37 passes through the water pipe 33. It flows into the heat exchanger 15.

  At this time, since the low-temperature refrigerant flows into the chiller heat exchanger 15 from the refrigeration cycle of the primary cycle 3, the cooling water flowing into the chiller heat exchanger 15 from the secondary cycle 5 side is exchanged with the chiller heat exchanger. Heat is exchanged with the refrigerant flowing through the vessel 15, and as a result, the refrigerant is heated and the cooling water is cooled.

  The refrigerant heated by heat exchange with the cooling water flows into the compressor 23 through the refrigerant pipe 17 and the like, and the above-described refrigeration cycle operation is repeatedly performed.

  On the other hand, the cooling water cooled by heat exchange with the refrigerant flows into the ceiling side heat exchanger 41 through the water pipe 39 and is evaporated by the heat absorbing action in the ceiling side heat exchanger 41. At this time, the air flowing through the ceiling side heat exchanger 41 is cooled by the above-described heat absorption action, and is blown out from the ceiling side heat exchanger 41 to the vehicle interior as cooling air. A blower having a function of blowing air to the indoor side may be installed near the ceiling, and the vehicle interior may be cooled through this blower.

  And the cooling water which flowed out the ceiling side heat exchanger 41 flows into the front side heat exchanger 45, and is evaporated by the endothermic action in this front side heat exchanger 45. At this time, the air flowing through the front-side heat exchanger 45 is cooled by the above-described heat absorption action, and is blown out from the front-side heat exchanger 45 into the vehicle interior as cooling air. Note that a blower having a blowing function for the interior side may be installed at a position facing the vehicle interior, and the vehicle interior may be cooled via the blower.

  The cooling water that has flowed out of the front side heat exchanger 45 flows through the water pipe 47 and is accumulated in the reservoir 31. Thereafter, the above-described cooling water circulation cycle is repeatedly performed by the operation of the compressor 37.

  As described above, according to the present embodiment, the refrigerant circulating in the primary cycle 3 and the cooling water circulating in the secondary cycle 5 including the ceiling side heat exchanger 41 and the front side heat exchanger 45 are chilled with heat. By exchanging heat with the exchanger 15, the coolant on the secondary cycle side can be cooled without circulating the refrigerant on the primary cycle side to the secondary cycle side.

  For this reason, the vehicle interior can be cooled by the ceiling side heat exchanger 41 by the cooling water cooled by the heat exchange function of the chiller heat exchanger 15 without diverting the refrigerant circulating in the front side refrigeration cycle. .

  As a result, even when a plurality of heat exchangers 41 and 45 are used on the front side and the ceiling side, the effect on the refrigeration capacity of the refrigeration cycle on the front side is reduced, and stable cooling of the vehicle interior can be performed. it can.

  Moreover, in this embodiment, the deterioration of the direct temperature distribution of a heat exchanger can be suppressed.

  Furthermore, in this embodiment, since it is not necessary to divide the refrigerant and make it flow through the ceiling-side heat exchanger 41, it is possible to realize refrigerant saving and reduce refrigerant flow noise.

  In the present embodiment, for example, cooling water that is a liquid refrigerant is circulated to each of the heat exchangers 41 and 45 to realize the cooling function, so that each of the heat exchangers can be downsized. The cooling device 1 as a whole can be simplified.

  In the present embodiment, even when HFC152a or CO2 is used as the refrigerant that circulates in the primary cycle 3, the refrigerant circulation is performed outside the passenger compartment (the front side of the instrument panel), so that there is a possibility that a refrigerant leakage problem may occur. Can be reduced.

  In the present embodiment, by using a plurality of (two) heat exchangers 41 and 45 each having a function of air cooling from the front side and the ceiling to the inside of the vehicle and a cooling air blowing function, the cooling power is converted into each heat exchanger 41. , 45 can be dispersed to each other, and a small and / or thin heat exchanger having a small evaporation capacity can be used as each heat exchanger. Moreover, since the air volume of each heat exchanger 41 and 45 can also be reduced, the noise resulting from the ventilation from the heat exchangers 41 and 45 can be prevented.

  Moreover, according to this embodiment, it can respond also to an idling stop.

  Furthermore, the ceiling side heat can be lowered by circulating the cooling water in the cooling water circulation cycle of the secondary cycle 5 during parking.

  In the present embodiment, by opening the solenoid valve 51 in the cooling water circulation cycle in the secondary cycle 5, the ceiling side heat exchanger 41 is bypassed, and the cooling water is flowed only to the front side heat exchanger 45 so that the front side is It is also possible to preferentially cool.

  Further, in the present embodiment, the number of heat exchangers installed on the ceiling side is one, but for example, as shown in FIG. 3, it is connected in parallel with the ceiling side heat exchanger 41 and arranged on the rear side of the passenger compartment. It is also possible to attach the rear-side heat exchanger 53. If comprised in this way, a cooling wind can be ventilated to the whole vehicle interior, and it becomes possible to improve a cooling effect.

1 is a perspective view showing a schematic configuration of a vehicle cooling device according to an embodiment of the present invention. It is a block diagram which shows the refrigerating cycle structure of the vehicle air conditioner shown in FIG. It is a perspective view which shows schematic structure of the cooling device for vehicles concerning the modification of one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle cooling device 3 Primary cycle 5 Secondary cycle 7 External heat exchanger 11 Orifice 15 Chiller heat exchanger 19, 31 Reservoir 23, 37 Compressor 41 Ceiling side heat exchanger 45 Front side heat exchanger 51 Solenoid valve

Claims (2)

A vehicle cooling device (1) including a plurality of cooling heat exchangers (41, 45) and mounted on a vehicle (V),
A primary cycle (3) constituting a refrigeration cycle for circulating refrigerant;
A secondary cycle (5) constituting a circulation cycle for circulating the liquid refrigerant;
With
The chiller heat exchanger (15) for exchanging heat between the refrigerant circulating in the primary cycle (3) and the liquid refrigerant circulating in the secondary cycle (5) includes the primary cycle (3) and the secondary cycle ( 5) as a common component,
At least one cooling heat exchanger (41) among the plurality of cooling heat exchangers (41, 45) is arranged on the ceiling of the vehicle (V) as a component of the secondary cycle (5). A vehicle air-conditioning apparatus. The liquid refrigerant is circulated using at least one other cooling heat exchanger (45) of the plurality of cooling heat exchangers (41, 45) as a component of the secondary cycle (5). The cooling apparatus for a vehicle according to claim 1, wherein the cooling apparatus is for a vehicle.

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