JP2017170984A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner for a vehicle capable of enhancing a temperature control property, while avoiding increase in a manufacturing cost and weight.SOLUTION: An air conditioner 10 for a vehicle comprises: an air conditioning case 12 including a scroll case part 34 which encases an air blower 14 therein. The scroll case part 34 is arranged between and above an evaporator 16 and a heat core 18, with a lower part thereof protruding into a cool wind passage 44 on downstream side of the evaporator 16. Thereby, an air stream passing the evaporator 16 can be deflected downward to the heater core 18 side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle air conditioner that is mounted on a vehicle and that adjusts the temperature of the vehicle interior by blowing air that has been temperature-adjusted by a heat exchanger into the vehicle interior.

  Conventionally, as in a vehicle air conditioner disclosed in Patent Document 1, air is taken into an air conditioning case under the action of a blower and is cooled by an evaporator as a cooling means, and a heater core as a heating means After the air heated by is mixed with a desired mixing ratio by driving the air mix damper, for example, the air is blown into the vehicle compartment from a plurality of air outlets provided in the air conditioning case. And in this vehicle air conditioner, the temperature controllability is improved by arranging the air mix damper on the downstream side of the heater core.

US Pat. No. 7,575,511

  However, the above-described vehicle air conditioner has a problem that the passage formed to the downstream of the evaporator and leading to the heater core is greatly curved, resulting in an increase in airflow resistance when air flows. In particular, when the vehicle air conditioner is mounted in a console provided between the driver and the passenger seat in the vehicle, the vehicle air conditioner is disposed in the passenger compartment, so that noise generated by ventilation resistance is generated. It becomes a big problem.

  Therefore, it is conceivable that the passage connecting the evaporator and the heater core has a straight shape. In this case, however, it becomes difficult to guide the air that has passed through the evaporator to the heater core, resulting in a decrease in temperature controllability. . Furthermore, although there is means for providing a rectifying rib for guiding air to the heater core in the above-described passage, the weight and the manufacturing cost increase.

  The present invention has been made in consideration of the above-described problems, and an object thereof is to provide a vehicle air conditioner capable of improving temperature controllability while avoiding an increase in manufacturing cost and weight.

To achieve the above object, the present invention provides an air conditioning case having a flow path therein, a cooling heat exchanger housed in the air conditioning case for cooling air, and a downstream side of the cooling heat exchanger. A heating heat exchanger for heating the air, a first passage connecting the cooling heat exchanger and the heating heat exchanger, and bypassing the heating heat exchanger formed downstream of the cooling heat exchanger. A second passage, a merging portion where the first passage and the second passage merge, an air mix damper provided in the merging portion, and a blower that sends out the sucked air to the cooling heat exchanger are housed. A vehicle air conditioner having a scroll case in communication with an air conditioning case,
The downstream side surface of the cooling heat exchanger and the upstream side surface of the heating heat exchanger are arranged to face each other,
The scroll case is provided between the cooling heat exchanger and the heating heat exchanger, and a part of the scroll case is disposed so as to protrude into the second passage.

  According to the present invention, in the vehicle air conditioner, the scroll case in which the blower is housed is provided between the cooling heat exchanger and the heating heat exchanger, a part of which is downstream of the cooling heat exchanger. In FIG. 2 so as to protrude into the second passage bypassing the heat exchanger for heating.

  Therefore, during the heating operation of the vehicle air conditioner, the air that has passed through the cooling heat exchanger and has flowed to the second passage is deflected by the projecting portion of the scroll case and led to the heating heat exchanger side. Therefore, for example, the temperature controllability can be improved without increasing the manufacturing cost and weight by providing a rectifying rib or the like.

  In addition, since the scroll case has a scroll wall having a circular cross section, the air that has passed through the cooling heat exchanger is preferably guided to the downstream side along the scroll wall, thereby reducing ventilation resistance. can do.

  Furthermore, by making the amount of protrusion of the scroll wall into the second passage less than half of the outer peripheral cross-sectional area of the scroll wall, the air flow that has passed through the cooling heat exchanger wraps around the scroll wall and stays there. Therefore, the pressure loss of the air flow can be reduced.

  According to the present invention, the following effects can be obtained.

  In other words, in a vehicle air conditioner, a scroll case in which a blower is housed is provided between a cooling heat exchanger and a heating heat exchanger, and a part of the scroll case is heated downstream of the cooling heat exchanger. By providing it so as to protrude into the second passage that bypasses the exchanger, for example, during heating operation, the air that has passed through the heat exchanger for cooling and has flowed into the second passage is caused by the protruding portion of the scroll case. Since it can be deflected and guided to the heat exchanger for heating, temperature controllability can be improved while avoiding an increase in manufacturing cost and weight by providing a rectifying rib or the like.

1 is an overall cross-sectional view of a vehicle air conditioner according to an embodiment of the present invention.

  DESCRIPTION OF EMBODIMENTS Preferred embodiments of a vehicle air conditioner according to the present invention will be described in detail below with reference to the accompanying drawings. In FIG. 1, reference numeral 10 indicates a vehicle air conditioner according to an embodiment of the present invention. In the following description, the left side (arrow A direction) of the vehicle air conditioner 10 shown in FIG. 1 will be described as the rear side of the vehicle, and the right side (arrow B direction) will be described as the front side of the vehicle.

  As shown in FIG. 1, the vehicle air conditioner 10 includes an air conditioning case 12 that constitutes each passage of air, a blower 14 disposed inside the air conditioning case 12, and an evaporator ( A cooling heat exchanger (16), a heater core (heating heat exchanger) 18 for heating the air, and a damper mechanism 20 for switching the flow of air flowing through the passages. The vehicle air conditioner 10 is used for a rear seat that blows air to the rear seat in the vehicle.

  The air-conditioning case 12 includes, for example, first and second divided cases 22 and 24 having a substantially symmetrical shape, and a lower case 26 attached to the lower part of the first and second divided cases 22 and 24. The second split cases 22 and 24 are provided so as to be split in the width direction orthogonal to the vehicle front-rear direction (arrows A and B directions), while the lower case 26 is opened in the first and second split cases 22, The lower part of 24 is obstruct | occluded and it is provided so that the 1st division | segmentation case 22 and the 2nd division | segmentation case 24 may be straddled.

  In addition, a vent air vent 28 that blows air in the vicinity of the occupant's face in the rear seat and a lower portion adjacent to the vent air vent 28 are provided in front of the air conditioning case 12 (in the direction of arrow B). A foot blower opening 30 for blowing air to the vicinity is opened.

  Further, the air conditioning case 12 is provided with a scroll case portion 34 having a cylindrical scroll wall 32 at a position on the upper side and the rear side of the vehicle (in the direction of arrow A), and the blower 14 is accommodated therein. At the same time, a spiral air passage 36 is formed so as to surround the outer peripheral side of the blower 14. That is, an air passage 36 is formed between the scroll wall 32 and the blower 14. The scroll case portion 34 is provided such that a lower portion thereof protrudes toward the cold air passage 44 formed on the downstream side of the evaporator 16. The protruding amount of the scroll wall 32 is set to be, for example, half or less of the outer peripheral cross-sectional area of the scroll wall 32. The scroll wall 32 may be protruded so as to be inside the flow path with respect to both tanks of the evaporator 16 when viewed from the air flow direction passing through the evaporator 16.

  The blower 14 includes, for example, a fan 38 that is rotationally driven under an energization action of a motor or the like, and is arranged so that the axial direction thereof is substantially parallel to the width direction of the air conditioning case 12. It is provided so as to straddle between the divided cases 24. That is, the vehicle air conditioner 10 is a full center type vehicle air conditioner in which a blower 14 is provided in the center of the air conditioning case 12.

  Further, the air passage 36 is formed counterclockwise from the lower side of the blower 14 when viewed from the first divided case 22 side, and extends toward the vehicle rear side (arrow A direction) while the passage cross-sectional area gradually increases. Exist. A nose portion 40 is formed at the end opened below the air passage 36, and the nose portion 40 is connected to the upstream side of the evaporator 16, which is the vehicle rear side (arrow A direction) in the air conditioning case 12.

  The lower case 26 is formed in a bottomed shape that covers the lower portions of the first and second divided cases 22 and 24, and hot water pipes 50 a and 50 b of a heater core 18 described later are inserted into the substantially central portion and taken out to the outside. A pipe insertion hole 42 is formed.

  The evaporator 16 is arrange | positioned so that it may stand in the downward direction of the air blower 14 inside the air conditioning case 12, for example, and the refrigerant | coolant is circulated through the several tube which is not shown in figure. Then, the air sent out from the blower 14 passes through the air passage 36 through the nose portion 40 and the inside of the evaporator 16, so that heat exchange between the air and the refrigerant is performed, and the cooled air passes through the evaporator 16. Supplied downstream.

  On the downstream side of the evaporator 16, a cold air passage (second passage) 44 that is formed above and flows air directly to the vent air outlet 28 without passing through the heater core 18, and below the cold air passage 44 is formed. Then, a warm air passage (first passage) 46 through which the air flows to the heater core 18 side is formed. In other words, the cold air passage 44 functions as a bypass passage that blows the air cooled by the evaporator 16 directly to the vent air outlet 28 without passing through the heater core 18.

  The heater core 18 is provided at a substantially central lower portion of the air conditioning case 12 on the downstream side (in the arrow B direction) of the evaporator 16, and one end portion is on the vehicle rear side (in the arrow A direction) and the other end portion is in the vehicle front side (in the arrow B direction). ) And are arranged substantially horizontally so as to be inclined by a predetermined angle. That is, the upstream side surface of the heater core 18 is provided so as to face the downstream side surface of the evaporator 16.

  The heater core 18 is provided with a pair of tanks 48a and 48b through which hot water heated by an internal combustion engine (not shown) circulates, and one tank 48a has a pair of hot water pipes 50a for supplying and discharging hot water, 50b is connected.

  Then, the hot water supplied from one hot water pipe 50a to the tank 48a returns to the tank 48a again through a plurality of tubes (not shown) and then circulates through the heater core 18 by being discharged through the other hot water pipe 50b. When the air passes through the inside, heat exchange between the air and the hot water is performed, and the heated air is supplied to the downstream side of the heater core 18.

  The damper mechanism 20 includes an air mix damper 52 provided at the junction of the cold air passage 44 and the hot air passage 46 on the downstream side of the heater core 18, a switching damper 54 that switches the ventilation state of the vent air outlet 28 and the foot air outlet 30. The switching damper 54 is provided on the downstream side of the air mix damper 52.

  The air mix damper 52 and the switching damper 54 are formed in substantially the same shape. For example, the air mix damper 52 and the switching damper 54 are provided so as to connect a pair of end walls 56 provided so as to be separated from each other by a predetermined distance and corner portions of the end walls 56. And a shielding wall 60 that connects the ends of the end wall 56 and is separated from the shaft 58. The air mix damper 52 and the switching damper 54 extend along the vehicle width direction in the air conditioning case 12, and the end portion of the shaft 58 is rotatable with respect to the first and second divided cases 22, 24. Supported by

  The air mix damper 52 rotates under the action of an actuator (not shown), so that the cool air flowing through the evaporator 16 and flowing through the cool air passage 44 and the hot air flowing through the heater core 18 and flowing through the hot air passage 46 are heated. On the other hand, the switching damper 54 moves to a position facing one of the vent air vent 28 and the foot air vent 30 by rotating under the drive action of an actuator (not shown). Either of these is selectively opened.

  The vehicle air conditioner 10 according to the embodiment of the present invention is basically configured as described above. Next, its operation and effects will be described.

  First, based on a control signal from a controller (not shown), air blown into the air conditioning case 12 by driving the blower 14 flows from the air passage 36 to the nose portion 40, and then passes through the evaporator 16. Cooled and supplied downstream.

  At this time, since the lower part of the scroll case 34 protrudes toward the cold air passage 44 by a predetermined amount, a part of the air that has passed through the evaporator 16 is deflected downward.

  When the cooling operation is performed, the air mix damper 52 rotates and the downstream passage of the heater core 18 is closed, so that the cold air that has passed through the evaporator 16 is on the hot air passage 46 side (the heater core 18 side). The air is directly blown from the vent air vent 28 into the vehicle compartment through the cool air passage 44.

  On the other hand, when the heating operation is performed, the air mix damper 52 is rotated to open the passage on the downstream side of the heater core 18 by a predetermined amount, so that a part of the air that has passed through the evaporator 16 is warm air passage 46. To the heater core 18 side. At this time, the air can be smoothly guided to the heater core 18 side (the hot air passage 46 side) provided below by the scroll wall 32 of the scroll case portion 34 protruding to the cold air passage 44 side.

  Then, at least a part of the air that has passed through the evaporator 16 is heated by passing through the heater core 18, and is blown from the foot blower opening 30 to the vicinity of the feet of the occupant in the passenger compartment as the temperature-adjusted warm air.

  As described above, in the present embodiment, in the full center type vehicle air conditioner 10 in which the blower 14 is provided at the center of the air conditioning case 12, a part of the scroll case portion 34 in which the blower 14 is accommodated, By arranging so as to protrude toward the cool air passage 44 formed on the downstream side of the evaporator 16 and bypassing the heater core 18, the air flow can be deflected downward and guided by the protruding portion of the scroll case portion 34. .

  Therefore, when performing the heating operation, the air that has passed through the evaporator 16 is preferably guided to the heater core 18 side by the scroll wall 32 of the scroll case part 34, thereby providing temperature controllability when adjusting the air to a desired temperature. Can be improved.

  Further, by moving the scroll case portion 34 toward the cold air passage 44 side, the height dimension of the air conditioning case 12 can be reduced by the amount of the movement, and accordingly, the vehicle air conditioner 10 is downsized. Can be achieved.

  Further, by making the scroll wall 32 of the scroll case portion 34 circular in cross section, the air that has passed through the evaporator 16 is preferably guided to the downstream side along the scroll wall 32, thereby reducing ventilation resistance. Can do.

  Furthermore, when the amount of protrusion of the scroll case 34 toward the cold air passage 44 is, for example, less than half of the outer peripheral cross-sectional area of the scroll wall 32 in the scroll case 34, the flow of air that has passed through the evaporator 16 is reduced. Since it is possible to prevent the air from flowing around and staying along the scroll wall 32, the pressure loss of the air flow can be reduced. In other words, the occurrence of air accumulation on the downstream side of the evaporator 16 is avoided.

  In addition, the vehicle air conditioner according to the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Vehicle air conditioner 12 ... Air conditioning case 14 ... Air blower 16 ... Evaporator 18 ... Heater core 20 ... Damper mechanism 26 ... Lower case 32 ... Scroll wall 34 ... Scroll case part 36 ... Air blow passage 40 ... Nose part 44 ... Cold wind passage 46 ... Temperature Air passage 52 ... Air mix damper 54 ... Switching damper

Claims (3)

An air conditioning case having a flow path therein, a cooling heat exchanger housed in the air conditioning case for cooling air, and a heating heat exchanger provided on the downstream side of the cooling heat exchanger for heating the air A first passage connecting the cooling heat exchanger and the heating heat exchanger, a second passage formed on the downstream side of the cooling heat exchanger and bypassing the heating heat exchanger, The air conditioning unit stores a merging portion where the first passage and the second passage merge, an air mix damper provided in the merging portion, and a blower that sends out sucked air toward the cooling heat exchanger. A vehicle air conditioner having a scroll case in communication with the case,
The downstream side surface of the cooling heat exchanger and the upstream side surface of the heating heat exchanger are arranged to face each other,
The scroll case is provided between the cooling heat exchanger and the heating heat exchanger, and a part of the scroll case is disposed so as to protrude into the second passage. apparatus. The vehicle air conditioner according to claim 1,
The vehicle air conditioner characterized in that the scroll case has a scroll wall formed in a circular cross section. The vehicle air conditioner according to claim 2,
The amount of protrusion of the scroll wall into the second passage is less than half of the outer peripheral cross-sectional area of the scroll wall.

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