JP5531991B2 - Air conditioner for vehicles - Google Patents

Description

  The present invention relates to a vehicle air conditioner including a heating heat exchanger that heats air blown into a passenger compartment.

  There exists a thing of patent documents 1, 2 as such a vehicle air conditioner.

  In the thing of patent document 1, there exist a cylinder head side flow path which cools a cylinder head as a cooling water flow path inside an engine, and a cylinder block side flow path which cools a cylinder block, and it passed the cylinder head side flow path. The cooling water is configured to flow into one heating heat exchanger.

  Moreover, in the thing of patent document 2, two heat exchangers for heating for heating air are provided, the cooling water flowing out from one cooling water outlet provided in the engine is divided, and each heating is performed. Is flowing into the heat exchanger.

US Pat. No. 5,337,704 European Patent Application No. 1008471

  By the way, in recent years, there is a demand for an engine mounted on a vehicle to ensure a required output and to make it smaller than before. In order to realize this, knocking may occur when the compression ratio is increased or when the supercharging pressure is increased in an engine with a supercharger. Therefore, it is necessary to improve anti-knocking performance. Therefore, it is conceivable to positively cool the cylinder head in order to improve the knocking resistance.

  However, the cylinder block needs to be maintained at a predetermined temperature or higher in order to suppress an increase in friction inside the engine. Therefore, a cylinder head side flow path and a cylinder block side flow path are provided as cooling water flow paths inside the engine, and the cooling water flow rate of the cylinder head side flow path is made larger than the cooling water flow rate of the cylinder block side flow path. It is possible.

  However, in this case, the cooling water temperature after cooling the cylinder head becomes lower than the minimum temperature required for heating, and as in the technique described in Patent Document 1, only the cooling water that has cooled the cylinder head is used as a heat source. When the air blown into the room is heated, there arises a problem that the air temperature cannot be raised sufficiently. Incidentally, conventionally, the cooling water temperature after cooling the cylinder head is about 80 to 90 ° C., which exceeds the minimum temperature required for heating, and thus such a problem does not occur.

  Therefore, as a heat exchanger for heating, the first heat exchange unit that exchanges heat between the cooling water that has cooled the cylinder head and the blown air, and the blown air that is heated by the cooling water that has cooled the cylinder block and the first heat exchange unit And a second heat exchanging part that exchanges heat with each other.

  According to this, in the first heat exchanging unit, the cooling air that has cooled the cylinder block is used as a heat source, and the blown air is heated, and then in the second heat exchanging unit, the cylinder that is hotter than the cooling water after cooling the cylinder head Since the blown air heated by the first heat exchange unit is further heated using the cooling water after block cooling as a heat source, the air temperature after passing through the heating heat exchanger can be sufficiently increased.

  However, if a cooling water inlet is provided on one end in the left-right direction of the first heat exchange unit, and similarly, a cooling water inlet is provided on one end in the left-right direction of the second heat exchange unit, the conditioned air after passing through the heat exchanger for heating. , A temperature distribution occurs in which the temperature differs in the left-right direction of the heat exchanger for heating.

  In particular, since the cooling water flow rate in the cylinder block side flow path is smaller than the cooling water flow rate in the cylinder head side flow path, the cooling water flowing into the second heat exchange unit is smaller than the cooling water flowing into the first heat exchange unit. Flow rate. For this reason, in the 2nd heat exchange part, the amount of heat radiation from the cooling water in the vicinity of the cooling water inlet is large, and the temperature difference in the left-right direction in the blown air of the second heat exchange part is in the blown air of the first heat exchange part. It becomes larger than the temperature difference in the left-right direction. As a result, in the above-described heating heat exchanger, the problem of the temperature distribution in the conditioned air after passing through the heating heat exchanger becomes significant.

  An object of this invention is to provide the vehicle air conditioner which can reduce the temperature difference of the left-right direction which arises in the air-conditioning wind after passing the heat exchanger for heating in view of the said point.

In order to achieve the above object, according to the first aspect of the present invention, the heating heat for heating the blown air into the vehicle interior using the first liquid and the second liquid having a higher temperature and a lower flow rate than the first liquid as heat sources. With an exchange (2)
The heating heat exchanger (2) includes a first heat exchange section (10) for exchanging heat between the first liquid and the blown air, and a blown air heated by the second liquid and the first heat exchange section (10). A second heat exchange part (20) for exchanging heat,
First heat exchange portion (10) is configured to have a first inlet for liquid (10a) in the left-right direction end side and lower side of the heating heat exchanger (2), an outlet (10b) of the first liquid upwardly Yes, and
Second heat exchange section (20), the heating heat exchanger while have a left-right direction end side and the second liquid to the lower inlet of (2) (20a), an outlet of the second liquid upwardly (20b) It is characterized in that to have a.

  According to this, since the positions of the liquid inlets of the first and second heat exchange units are reversed left and right, the horizontal temperature distribution generated in the blown air of the first and second heat exchange units can be reversed left and right. As a result, the temperature difference in the left-right direction generated in the conditioned air after passing through the heat exchanger for heating can be reduced.

Furthermore, according to this, since the temperature distribution in the vertical direction in which the upper side becomes low temperature and the lower side becomes high temperature in the conditioned air after passing through the heat exchanger for heating can be formed, the upper conditioned air is passed from the face outlet to the upper body of the occupant. By blowing out the air and blowing the lower conditioned air toward the feet of the occupant from the foot outlet, the passenger's comfort can be improved by making the temperature distribution in the passenger compartment a chilly foot heat type.

In the invention according to claim 1, for example, as described in claim 2, the first, second heat exchange portion (10, 20) are both a laminated plurality of tubes (11, 21) The plurality of tubes (11, 21) communicate with one end in the longitudinal direction, and communicate with the inlet side tank portion (12, 22) on the liquid inlet side and the other end in the longitudinal direction of the plurality of tubes (11, 21). And an outlet side tank portion (13, 23) which becomes a liquid outlet side,
The inlet side tank parts (12, 22) of the first and second heat exchange parts (10, 20) are positioned on the lower side, and the outlet side tank parts (13) of the first and second heat exchange parts (10, 20). 23) is located on the upper side,
The first heat exchange part (10) is provided with an inlet (10a) for the first liquid on one end side in the left-right direction of the heat exchanger for heating (2) in the inlet side tank part (12).
The second heat exchange section (20) employs a configuration in which an inlet (20a) for the second liquid is provided on the other side in the left-right direction of the heating heat exchanger (2) in the inlet-side tank section (22). it can.

Further, in the invention described in claim 1 , for example, as described in claim 3 , the first and second heat exchange sections (10, 20) are both a plurality of stacked tubes (11, 21). ), A first tank portion (12, 22) communicating with one end in the longitudinal direction of the plurality of tubes (11, 21), and a second tank communicating with the other end in the longitudinal direction of the plurality of tubes (11, 21). Part (13, 23),
The first tank portions (12, 22) of the first and second heater cores (10, 20) are located on one side in the left-right direction of the heating heat exchanger (2), and the first and second heater cores (10, 20) The second tank part (13, 23) is located on the other side in the left-right direction of the heat exchanger for heating (2),
The first heat exchanging part (10) is provided with a partition wall (16) inside the first tank part (12), and the first heat exchange part (10) is located below the partition wall (16) of the first tank part (12). A liquid inlet (10a) is provided, and a first liquid outlet (10b) is provided in an upper part of the partition wall (16) of the first tank section (12);
The second heat exchanging part (20) is provided with a partition wall (26) inside the second tank part (23), and is second below the partition wall (26) of the second tank part (23). A configuration in which a liquid inlet (20a) is provided and a second liquid outlet (20b) is provided in an upper portion of the second tank portion (23) above the partition wall (16) can be employed.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

It is a schematic block diagram of the vehicle air conditioner in 1st Embodiment. It is a side view of the heat exchanger 2 for a heating in FIG. (A), (b) is a front view of the 1st, 2nd heater cores 10 and 20 of FIG. 2, respectively. It is the IV-IV sectional view taken on the line in FIG. 3 (a), (b). (A), (b), (c) is a conceptual diagram which respectively shows the blowing air temperature distribution of the 1st heater core 10, the 2nd heater core 20, and the heat exchanger 2 for a heating in 1st Embodiment. (A), (b), (c) is a conceptual diagram which shows the blowing air temperature distribution of the 1st heater core 10, the 2nd heater core 20, and the heat exchanger 2 for a heating in the comparative example 1, respectively. (A), (b), (c) is a conceptual diagram which respectively shows the blowing air temperature distribution of the 1st heater core 10, the 2nd heater core 20, and the heat exchanger 2 for a heating in 2nd Embodiment. (A), (b) is a front view of the 1st and 2nd heater cores 10 and 20 of the heat exchanger for heating in a 3rd embodiment, respectively. (A), (b), (c) is a conceptual diagram which respectively shows the blowing air temperature distribution of the 1st heater core 10, the 2nd heater core 20, and the heat exchanger 2 for a heating in 3rd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other are given the same reference numerals in the drawings in order to simplify the description.

(First embodiment)
FIG. 1 shows a schematic configuration of a vehicle air conditioner in the present embodiment. The vehicle air conditioner of the present embodiment is mounted on a hybrid vehicle or the like that obtains driving force for vehicle traveling from an engine (internal combustion engine) and a traveling electric motor.

  The vehicle air conditioner 1 according to the present embodiment includes a heating heat exchanger 2 that heats the air blown into the vehicle interior by exchanging heat between the cooling water of the engine 30 and the air blown into the vehicle interior. . The cooling water is water or water containing additive components.

  The heat exchanger 2 for heating has the 1st heater core 10 and the 2nd heater core 20, and both are integrated. The 1st heater core 10 and the 2nd heater core 20 are equivalent to the 1st heat exchange part and the 2nd heat exchange part of the heat exchanger for heating in the present invention, respectively.

  Cooling water that has cooled the cylinder head 31 of the engine 30 flows into the first heater core 10, and cooling water that has cooled the cylinder block 32 of the engine 30 flows into the second heater core 20. The first heater core 10 is located on the upstream side of the air flow, and the second heater core 20 is located on the downstream side of the air flow.

  Here, in the engine 30, the cylinder block 32 is a block body that constitutes a cylinder bore (columnar hole) in which a piston reciprocates. The cylinder head 31 is a block body that closes the top dead center side opening of the cylinder bore and constitutes a combustion chamber.

  A first cooling water inlet 31 a and a first cooling water outlet 31 b as a first outlet portion are provided on the cylinder head 31 side of the engine 30, and cooling water for cooling the cylinder head 31 flows inside the cylinder head 31. A cooling water passage on the cylinder head side is formed. The cooling water flowing in from the first cooling water inlet 31a flows through the cylinder head 31 and then flows out from the first cooling water outlet 31b.

  Similarly, a second cooling water inlet 32 a and a second cooling water outlet 32 b as a second outlet are provided on the cylinder block 32 side of the engine 30, and cooling for cooling the cylinder block 32 is provided inside the cylinder block 32. A cooling water passage on the cylinder block side through which water flows is formed. The cooling water flowing in from the second cooling water inlet 32a flows through the cylinder block 32 and then flows out from the second cooling water outlet 32b. Thus, in this embodiment, the cooling water which cooled the cylinder block 32 flows out from the 2nd cooling water exit 32b, without joining the cooling water which cooled the cylinder head 31. FIG.

  Thus, the engine 30 of this embodiment has two cooling systems. During steady operation of the engine 30, the cooling water flow rate in the cooling water flow path on the cylinder head side is made larger than the cooling water flow rate in the cooling water flow path on the cylinder block side so that the cylinder head 31 is more positive than the cylinder block 32. It is designed to cool down. This is because the anti-knock performance is improved by lowering the temperature of the cylinder head 31, and the low viscosity of the engine oil is maintained by maintaining the cylinder block 32 at a high temperature, thereby increasing the friction inside the engine. It is for suppressing.

  In the heat exchanger 2 for heating, the cooling water inlet 10a of the first heater core 10 is connected to a first cooling water outlet 31b on the cylinder head 31 side of the engine 30 via a pipe, and the first cooling water outlet The cooling water flowing out from 31 b flows into the first heater core 10. On the other hand, the cooling water inlet 20a of the second heater core 20 is connected to a second cooling water outlet 32b on the cylinder block 32 side of the engine 30 via a pipe, and the cooling water flowing out from the second cooling water outlet 32b It flows into the second heater core 20.

  Therefore, in this embodiment, low temperature and large flow rate cooling water flows into the first heater core 10, and high temperature and small flow rate cooling water flows into the second heater core 20. Specifically, the temperature and flow rate of the cooling water flowing into the first heater core 10 are in the range of 30 to 60 ° C. and 5 to 15 L / min, and the temperature and flow rate of the cooling water flowing into the second heater core 20 are It is the range of 40-90 degreeC and 0.2-3 L / min.

  As will be described later, each of the first heater core 10 and the second heater core 20 has an independent heat exchange core portion. Therefore, the cooling water flowing into the first heater core 10 exchanges heat with air at the heat exchange core portion of the first heater core 10 without being mixed with the cooling water flowing into the second heater core 20. Similarly, the cooling water flowing into the second heater core 20 exchanges heat with air at the heat exchange core portion of the second heater core 20 without being mixed with the cooling water flowing into the first heater core 10.

  Then, the cooling water flowing out from the cooling water outlet 10b of the first heater core 10 and the cooling water flowing out from the cooling water outlet 20b of the second heater core 20 merge on the downstream side of the cooling water flow of the heat exchanger 2 for heating. Then, it branches at the branch part 41 and flows into each of the first cooling water inlet 31a and the second cooling water outlet 32a of the engine 30.

  In addition, as shown in FIG. 1, the water pump 42 is disposed in the middle of the cooling water flow path between the heat exchanger 2 for heating and the branch portion 41. The water pump 42 is an adjusting unit that forms a cooling water flow and adjusts the cooling water flow rate. The water pump 42 is a mechanical or electric pump, and controls the coolant flow rate by controlling the rotation speed by a control device (not shown).

  The engine 30 communicates with a radiator (not shown), and the cooling water flowing out from the cylinder head 31 radiates heat with the radiator, and the cooling water after heat radiation can flow into the cylinder head 32 and the cooling water flowing out from the cylinder block 32. Radiates heat with the radiator, and the cooling water after heat radiation can flow into the cylinder block 32.

  Next, the heating heat exchanger 2 will be described in detail. FIG. 2 shows a side view of the heat exchanger 2 for heating, and FIGS. 3A and 3B show front views of the first and second heater cores 10 and 20 viewed from the downstream side of the air flow. The up and down arrows in the figure indicate the up and down direction parallel to the direction of gravity when mounted on the vehicle, and the same applies to other figures. Further, the vehicle at this time is located on a horizontal surface, not an inclined surface.

  As shown in FIGS. 2, 3 (a) and 3 (b), the first and second heater cores 10, 20 of the heating heat exchanger 2 are both stacked flat tubes 11, 21. And communicated with one end side in the longitudinal direction of the plurality of tubes 11, 21 and communicated with the other end side in the longitudinal direction of the plurality of tubes 11, 21; The outlet side tank parts 13 and 23 used as the cooling water exit side are provided.

  The heat exchanger 2 for heating is housed in an air conditioning case (not shown) together with a blower (not shown) that forms blown air toward the passenger compartment, and is mounted on the vehicle. Specifically, in the heat exchanger 2 for heating, the second heater core 20 is positioned on the downstream side of the air flow from the first heater core 10, and the inlet side tank portions 12 and 22 of the first and second heater cores 10 and 20. Is located on the lower side, the outlet side tank portions 13 and 23 of the first and second heater cores 10 and 20 are located on the upper side, and the longitudinal direction of the tubes 11 and 21 is parallel to the vertical direction. Mounted on the vehicle.

  The first heater core 10 and the second heater core 20 have the same size in the left-right and up-down directions when viewed in the air flow direction. Thereby, all of the air after passing through the first heater core 10 passes through the second heater core 20.

  In both the first and second heater cores 10 and 20, the plurality of tubes 11 and 21 extend in one direction (vertical direction) and are arranged in a line in the vehicle left-right direction, which is a direction perpendicular to the one direction. Are stacked. The inlet side tank parts 12 and 22 and the outlet side tank parts 13 and 23 are elongated in the stacking direction of the tubes 11 and 21. Therefore, the vehicle left-right direction corresponds to the stacking direction of the tubes 11, 21 and the longitudinal direction of the inlet-side tank portions 12, 22.

  Further, the first and second heater cores 10 and 20 include corrugated fins 14 and 24 that are joined to the outer surfaces of the tubes 11 and 21 to promote heat transfer. In the first and second heater cores 10 and 20, the first and second heat exchange core portions 15 and 25 of the all-pass type, that is, the unidirectional flow type, are formed by the laminated structure of the tubes 11 and 21 and the fins 14 and 24, respectively. Is configured.

  Therefore, in the 1st, 2nd heat exchange core parts 15 and 25, the cooling water which flowed into entrance side tank parts 12 and 22 is distributed to a plurality of tubes 11 and 21, respectively, and inside a plurality of tubes 11 and 21 is carried out. Cooling water flows from bottom to top.

  Further, as shown in FIGS. 3A and 3B, cooling water inlets 10a and 20a are provided in the inlet side tank portions 12 and 22 of the first and second heater cores 10 and 20, respectively. The cooling water outlets 10b and 20b are provided in the outlet side tank portions 13 and 23 of the second heater cores 10 and 20, respectively.

  In the present embodiment, the cooling water inlet 10a and the cooling water outlet 10b of the first heater core 10 are arranged at one end in the left-right direction of the heating heat exchanger 2 when the heating heat exchanger 2 is viewed in the air flow direction (FIG. 3). The cooling water inlet 20a and the cooling water outlet 20b of the second heater core 20 are located on the other side in the left-right direction of the heating heat exchanger 2 (on the right side in FIG. 3B). ing.

  Therefore, in the first heater core 10, the cooling water flows in the inlet side tank portion 12 from the left side to the right side in FIG. 3 (a), and in the outlet side tank portion 13 from the right side to the left side in FIG. 3 (a). Flowing. On the contrary, in the second heater core 20, the cooling water flows in the inlet side tank portion 22 from the right side to the left side in FIG. 3 (b), and in the outlet side tank portion 23 in the left side in FIG. 3 (b). Flowing from right to right.

  In addition, as shown in FIG. 2, the inlet side tank portions 12 and 22 of the first and second heater cores 10 and 20 are integrated, and the inside of one inlet side tank 50 is divided into two by a partition wall 51. It consists of partitioning.

  Here, FIG. 4 shows a cross-sectional view taken along line IV-IV in FIGS. FIG. 4 is a cross-sectional view of the inlet side tank portions 12 and 22 of the first and second heater cores 10 and 20. As shown in FIG. 4, the inlet side tank portions 12, 22 of the first and second heater cores 10, 20 are specifically tank interiors formed by a common tank body member 52 and a common core plate 53. The space is configured by dividing the space into a space on the first heater core 10 side and a space on the second heater core 20 side by a partition wall 51. A common tank body member 52 that mainly constitutes a tank internal space, a common core plate 53 into which a plurality of tubes are inserted, and a partition wall 51 are made of metal such as aluminum and brazed. Yes.

  As shown in FIG. 2, the outlet side tank portions 13 and 23 of the first and second heater cores 10 and 20 are also integrated in the same manner as the inlet side tank portions 12 and 22, and one outlet side tank 60 is provided. Is divided into two by a partition wall 61.

  In the air conditioning case, the bypass air passage through which the blown air flows, bypassing the heating heat exchanger 2, the air after passing through the bypass air passage, and the air after passing through the heating heat exchanger 2 are mixed. An air mix door that adjusts the ratio is provided. And the air flow path through which the air after passing through the heat exchanger 2 for heating flows is connected to the foot blower outlet on the lower side, and to the defroster blower outlet and the face blower outlet on the upper side.

  Next, the operation of the vehicle air conditioner 1 of the present embodiment will be described.

  A control device (not shown) of the vehicle air conditioner 1 controls the blower so as to obtain an air flow amount corresponding to the target blown air temperature TAO during heating, and controls the air mix door so as to be in a desired position. The target blown air temperature TAO is calculated according to the air conditioning heat load determined by the set temperature and the environmental conditions, and is the target temperature of the air blown out from the outlet to the vehicle interior.

  Thereby, in the 1st heater core 10, blowing air is heated by heat exchange with the cooling water after cylinder head 31 cooling. The cooling water after cooling the cylinder head 31 actively cools the cylinder head 31, and thus is cooler than the minimum temperature required for heating, but has a larger flow rate than the cooling water after cooling the cylinder block 32. It has a lot of heat. Therefore, in the present embodiment, in order to extract as much heat as possible of the cooling water after cooling the cylinder head 31, as compared with the second heater core 20, the cooling water flow rate inside the first heater core 10 is increased, and the air and the cooling water. The heat transfer coefficient is increased. For this reason, in the 1st heater core 10, much calorie | heat amount can be supplied to ventilation air from the cooling water of the large flow volume after the cylinder head 31 cooling. As a result, the temperature of the air after passing through the first heater core 10 is close to the cooling water temperature before flowing into the first heater core 10 (the inlet water temperature of the first heater core).

  And in the 2nd heater core 20, the ventilation air after the 1st heater core 10 passage is heated by heat exchange with the cooling water after cylinder block 32 cooling. Since the cooling water after cooling the cylinder block 32 is hotter than the cooling water after cooling the cylinder head 31, the temperature of the blown air after passing through the second heater core 20 is higher than the blown air after passing through the first heater core 10. Can be raised.

  By the way, unlike this embodiment, if the air is heated using only the cooling water that has cooled the cylinder head 31 as the heat source, as in the technique described in Patent Document 1, the air temperature cannot be sufficiently increased, and the heating is not performed. Not satisfied. Further, when the cooling water after cooling the cylinder head 31 that has flowed out of the engine and the cooling water after cooling the cylinder block 32 are all mixed, the temperature of the cooling water after mixing becomes lower than the minimum temperature required for heating. For this reason, since the energy transfer efficiency from cooling water to air becomes low, even if the air is heated using the mixed cooling water as a heat source, the air temperature cannot be sufficiently increased and heating is not established.

  In contrast, in the present embodiment, the engine 30 is provided with the first cooling water outlet 31b and the second cooling water outlet 32b, and the low-temperature side cooling water after cooling the cylinder head 31 is caused to flow out from the first cooling water outlet 31b. The high-temperature side cooling water after cooling the cylinder block 32 is allowed to flow out from the second cooling water outlet 32b. Then, the low temperature side cooling water flowing out from the first cooling water outlet 31b is caused to flow into the first heater core 10 without mixing both cooling waters, and the high temperature side cooling water flowing out from the second cooling water outlet 32b is supplied to the second cooling water. It flows into the heater core 20.

  Thus, in this embodiment, since the 2nd heater core 20 heats the blowing air to the vehicle interior by using the high temperature side cooling water flowing out from the second cooling water outlet 32b as a heat source, the first cooling water outlet 31b Compared with the case where only the cooling water on the low temperature side of the outflow is used as the heat source, or the case where the mixed water obtained by mixing the low temperature side cooling water and the high temperature side cooling water is used as the heat source, the air temperature after being heated by the second heater core 20 Can be high.

  Further, in the present embodiment, after the blower air is heated with the first heater core 10 using the low-temperature side cooling water as the heat source, the heated air is heated with the second heater core 20 using the high-temperature side cooling water as the heat source. The amount of heat of both the cooling water on the low temperature side and the cooling water on the high temperature side can be used effectively.

  That is, according to the present embodiment, the air blown into the vehicle interior is heated with one heater core using a mixture of the entire cooling water flowing out from both the first and second cooling water outlet portions 31b and 32b as a heat source. Compared with the case, the energy transmission efficiency from the cooling water to the air in the whole cooling water in the heater core can be increased. As a result, even when the amount of air blown by the blower is large, the air can be raised to a sufficiently high temperature, and heating can be established.

  Next, main features of the vehicle air conditioner 1 of the present embodiment will be described.

  5A, 5B, and 5C show the blown air temperature distribution of the first heater core 10, the second heater core 20, and the heating heat exchanger 2 as a whole in this embodiment. On the other hand, FIGS. 6A, 6 </ b> B, and 6 </ b> C show the blown air temperature distribution of the first heater core 10, the second heater core 20, and the heating heat exchanger 2 as a whole in Comparative Example 1, respectively. In addition, the area | region enclosed with the broken line in FIG. 5, 6 is blowing air temperature distribution. 5 (a), 5 (b), 6 (a), and 6 (b) are provided when air having no temperature distribution is passed through one of the first and second heater cores 10 and 20. FIG. 5 (c) and FIG. 6 (c) show the temperature distribution of the air blown from one of the first and second heater cores 10 and 20, and FIG. Is the temperature distribution.

  As shown in FIGS. 6A and 6B, the heating heat exchanger 2 of Comparative Example 1 includes a cooling water inlet 10a and a cooling water outlet 10b of the first heater core 10, and a cooling water inlet of the second heater core 20. Unlike the first embodiment, both the 20a and the cooling water outlet 20b are located on one end in the left-right direction (left side in FIG. 6) of the heat exchanger 2 for heating. It is the same as the form.

  First, as shown in FIGS. 5 (a) and 5 (b) and FIGS. 6 (a) and 6 (b), cooling water inlets 10a and 20a are provided at one end in the left-right direction of the first and second heater cores 10 and 20, respectively. Therefore, for the following reasons, the air distribution from the first and second heater cores 10 and 20 has a temperature distribution in which the temperature differs in the left-right direction.

  That is, in the first heater core 10, the left and right directions in which the cooling water flow rate on the side close to the cooling water inlet 10a among the plurality of tubes 11 is large and the cooling water flow rate on the side farther from the cooling water inlet 10a among the plurality of tubes 11 is small. The flow distribution at is generated. In particular, in the first heater core 10 of the present embodiment, since the cooling water inlet 10a and the cooling water outlet 10b are located on the same side in the left-right direction, the side close to the cooling water inlet 10a among the plurality of tubes 11 has a plurality of Since the water flow path from the cooling water inlet to the cooling water outlet is shorter and the water flow resistance is smaller than the side farther from the cooling water inlet 10a in the tube 11, such a flow distribution in the left-right direction is likely to occur. In addition, when the cooling water inlet 10a is provided at one end in the left-right direction of the inlet side tank unit 12, the cooling water temperature is lowered in the inlet side tank unit 12 due to heat radiation to the air as the distance from the cooling water inlet 10a increases.

  For this reason, the air distribution of the first heater core 10 has a temperature distribution in which the same side as the position of the cooling water inlet 10a has a high temperature in the left-right direction and the opposite side to the position of the cooling water inlet 10a has a low temperature.

  Also in the air blown from the second heater core 20 of the present embodiment, the same side as the position of the cooling water inlet 20a in the left-right direction becomes high temperature as in the first heater core 10, and the opposite side to the position of the cooling water inlet 20a becomes low temperature. This produces a temperature distribution. However, in the second heater core 20, the cooling water flow rate is smaller than that of the first heater core 10, so that the heat radiation from the cooling water on the side close to the cooling water inlet 20 a among the plurality of tubes 21 is large, and the second heater core 20 The temperature difference in the left-right direction in the air blown from the heater core 20 becomes larger than the temperature difference in the left-right direction in the air blown from the first heater core 10.

  And in the comparative example 1, as shown to Fig.6 (a), (b), in the 1st, 2nd heater cores 10 and 20, since the position of the cooling water inlets 10a and 20a is on the same side in the left-right direction, The blown air from the first and second heater cores 10 and 20 has a high temperature side and a low temperature side on the same side in the left-right direction and the same temperature distribution.

  For this reason, as shown in FIG.6 (c), the temperature distribution that temperature differs greatly in the left-right direction will arise in the blowing air of the heat exchanger 2 for a whole. As a result, for example, the conditioned air after passing through the heat exchanger 2 for heating branches into one side and the other side in the left-right direction of the vehicle, and the conditioned air is blown out from the air outlet on the driver seat side and the air outlet on the passenger seat side. In this case, there is a difference in the temperature of the air blown between the driver seat and the passenger seat.

  On the other hand, in this embodiment, as shown in FIGS. 5A and 5B, the positions of the cooling water inlets 10a and 20a are reversed left and right in the first and second heater cores 10 and 20, respectively. The left and right temperature distributions generated in the air blown from the first and second heater cores 10 and 20 can be reversed.

  For this reason, according to this embodiment, as shown in FIG.5 (c), the temperature difference of the left-right direction produced in the blowing air of the heat exchanger 2 for a whole can be reduced. As a result, the conditioned air after passing through the heat exchanger 2 for heating branches into one side and the other side in the left-right direction of the vehicle, and the conditioned air is blown out from the air outlet on the driver seat side and the air outlet on the passenger seat side. In this case, the difference in the temperature of the blown air between the driver seat side and the passenger seat side in the passenger compartment is reduced.

  Incidentally, in this embodiment, the cooling water inlets 10a and 20a of the first and second heater cores 10 and 20 are both positioned below, and the cooling water outlets 10b and 20b of the first and second heater cores 10 and 20 are both. Since it is located on the upper side, as shown in FIG. 5C, in the blown air of the heating heat exchanger 2 as a whole, there is a temperature distribution in the vertical direction in which the upper side has a low temperature and the lower side has a high temperature.

  Thereby, the conditioned air after passing through the heat exchanger 2 for heating is branched to the upper side and the lower side, the upper conditioned air is blown out from the face outlet toward the upper body of the occupant, and the lower conditioned air is blown from the foot outlet. By blowing out toward the feet of the occupant, the passenger's comfort can be improved with the temperature distribution in the passenger compartment as a head-chill type.

(Second Embodiment)
FIGS. 7A, 7B, and 7C show the blown air temperature distribution of the first heater core 10, the second heater core 20, and the heating heat exchanger 2 as a whole in the present embodiment.

  As shown in FIGS. 7A and 7B, the heat exchanger 2 for heating according to the present embodiment includes cooling water inlets 10a and 20a and a cooling water outlet 10b in the first and second heater cores 10 and 20, respectively. , 20b is different from the heat exchanger 2 for heating of the first embodiment in that it is arranged on a different side in the left-right direction.

  That is, as shown in FIG. 7A, the first heater core 10 has the cooling water inlet 10a positioned on one end side in the left-right direction (left end side in the figure) and the cooling water outlet 10b positioned on the other end side in the left-right direction (shown in the figure). It is located on the right end side. On the other hand, in the second heater core 20, as shown in FIG. 7B, the cooling water inlet 20a is positioned on the other end in the left-right direction (right end side in the figure), and the cooling water outlet 20b is on one end in the left-right direction (shown in the figure). It is located on the left side.

  Even in this case, in the first and second heater cores 10 and 20, the cooling water flow rate on the side close to the cooling water inlets 10 a and 20 a among the plurality of tubes 11 and 21 is large. The flow rate distribution in the left-right direction that the cooling water flow rate on the side far from 10a and 20a is small occurs. Further, when the cooling water inlets 10a and 20a are provided at one end in the left-right direction of the inlet side tank portions 12 and 22, heat is radiated to the air as the distance from the cooling water inlets 10a and 20a increases in the inlet side tank portions 12 and 22. As a result, the temperature decreases.

  Further, in the second heater core 20, the cooling water flow rate is smaller than that of the first heater core 10, so that the heat radiation from the cooling water on the side close to the cooling water inlet 20 a among the plurality of tubes 11 is large.

  For this reason, as shown in FIGS. 7A and 7B, the air distribution from the first and second heater cores 10 and 20 has a temperature distribution in which the temperature differs in the left-right direction.

  Also in this embodiment, as in the first embodiment, the positions of the cooling water inlets 10a and 20a in the first and second heater cores 10 and 20 are set as shown in FIGS. 7 (a) and 7 (b). Since the left and right are reversed, the temperature distribution in the left and right direction generated in the air blown from the first and second heater cores 10 and 20 can be reversed to the left and right. For this reason, also by this embodiment, as shown in FIG.7 (c), the temperature difference of the left-right direction produced in the blowing air of the heat exchanger 2 for a whole can be reduced.

(Third embodiment)
FIGS. 8A and 8B are front views of the first and second heater cores 10 and 20 of the heating heat exchanger according to the present embodiment as viewed from the downstream side of the air flow.

  In the first and second embodiments, the first and second heater cores 10 and 20 are all-pass types in which cooling water flows in one direction through a plurality of tubes. However, in the present embodiment, the first and second heater cores are used. 10 and 20 are of the U-turn type in which the cooling water flows in one direction and then the cooling water flows in the opposite direction. Hereinafter, differences from the first embodiment will be mainly described.

  As shown in FIGS. 8 (a) and 8 (b), the first and second heater cores 10 and 20 of the heating heat exchanger 2 are both laminated with a plurality of flat tubes 11 and 21 and a plurality of tubes. First tank portions 12 and 22 that communicate with one longitudinal end of the tubes 11 and 21, second tank portions 13 and 23 that communicate with the other longitudinal end of the plurality of tubes 11 and 21, and the tube 11 , 21 and fins 14 and 24 joined to the outer surface, and the laminated structure of the tubes 11 and 21 and the fins 14 and 24 constitutes first and second heat exchange core portions 15 and 25.

  In the present embodiment, the first tank portions 12 and 22 of the first and second heater cores 10 and 20 are positioned on one side in the left-right direction (left side in the drawing), and the second tanks of the first and second heater cores 10 and 20 are located. The heat exchanger 2 for heating is mounted on the vehicle so that the tank parts 13 and 23 are located on the other side in the left and right direction (right side in the figure), and the longitudinal direction of the tubes 11 and 21 is parallel to the horizontal direction. Is done.

  The first heater core 10 is provided with a partition wall 16 at the center in the longitudinal direction of the first tank portion 12 located on the left side of FIG. 8A, and is a lower portion than the partition wall 16 of the first tank portion 12. Is provided with a cooling water inlet 10a, and a cooling water outlet 10b is provided above the partition wall 16 of the first tank portion 12.

  For this reason, in the 1st heater core 10, after the cooling water which flowed in from cooling water inlet 10a flows in the tube 11 located in the lower half among a plurality of tubes 11 from the left side of the figure to the right side, The inside of the tube 11 located in the upper half of the tubes 11 flows from the right side to the left side in the figure.

  On the other hand, the second heater core 20 is provided with a partition wall 26 at the center in the longitudinal direction of the second tank portion 23 located on the right side in FIG. 8B, and is lower than the partition wall 26 of the second tank portion 23. A cooling water inlet 20 a is provided in the side portion, and a cooling water outlet 20 b is provided in the upper portion of the partition wall 26 of the second tank portion 23.

  Therefore, in the second heater core 20, contrary to the first heater core 10, the cooling water flowing in from the cooling water inlet 20 a passes through the tube 21 located in the lower half of the plurality of tubes 21 from the right side to the left side in the drawing. Then, the gas flows in the tube 21 located in the upper half of the plurality of tubes 21 from the left side to the right side in the drawing.

  9A, 9B, and 9C show the blown air temperature distribution of the first heater core 10, the second heater core 20, and the heating heat exchanger 2 as a whole in this embodiment.

  As shown in FIGS. 9 (a) and 9 (b), the cooling water inlets 10a and 20a are provided at the left and right ends of the first and second heater cores 10 and 20, and the cooling water flows while dissipating heat. The air distribution from each of the first and second heater cores 10 and 20 has a temperature distribution in which the temperature differs in the left-right direction. That is, in the lower half of the blown air, the cooling water inlets 10a, 20a side has a high temperature in the left-right direction, the side far from the cooling water inlets 10a, 20a has a medium temperature, and in the upper half of the blown air, the cooling water outlets 10b, 20b. The side away from the temperature becomes medium temperature, and the cooling water outlets 10b, 20b side becomes low temperature.

  In the present embodiment, since the positions of the cooling water inlets 10a and 20a are reversed left and right in the first and second heater cores 10 and 20, the horizontal direction generated in the air blown from the first and second heater cores 10 and 20 is reversed. The temperature distribution can be reversed. For this reason, according to this embodiment, as shown in FIG.9 (c), the temperature difference of the left-right direction produced in the blowing air of the heat exchanger 2 for a whole can be reduced.

  Also in this embodiment, the cooling water inlets 10a and 20a of the first and second heater cores 10 and 20 are both positioned below, and the cooling water outlets 10b and 20b of the first and second heater cores 10 and 20 are both. 9 is also located above, as shown in FIG. 9 (c), in the blown air of the heating heat exchanger 2 as a whole, there is a vertical temperature distribution in which the upper side has a low temperature and the lower side has a high temperature.

  Therefore, the present embodiment also provides the same effects as those of the first embodiment.

(Other embodiments)
(1) In the first and second embodiments, the inlet side tank portions 12 and 22 of the first and second heater cores 10 and 20 are integrated, but the inlet side tank portions 12 and 22 may be separated. good. Similarly, in the first and second embodiments, the outlet side tank parts 13 and 23 are integrated, but these outlet side tank parts 13 and 23 may be separated. The same applies to the first tank portions 12 and 22 and the second tank portions 13 and 23 of the third embodiment.

  Further, in each of the above-described embodiments, the cooling water outlets 10b and 20b are provided in the first and second heater cores 10 and 20, respectively, but one cooling water outlet of the heating heat exchanger 2 may be provided. For example, in the heat exchanger 2 for heating shown in FIG. 2, the partition wall 61 inside one outlet side tank 60 may be omitted, and one cooling water outlet may be provided in one outlet side tank 60.

  In the above-described embodiments, the left-right direction of the heat exchanger 2 for heating coincides with the left-right direction of the vehicle, but may not coincide with the left-right direction of the vehicle.

  (2) In each of the above-described embodiments, the cooling water flowing out from the first cooling water outlet 31b of the engine 30 is only the cooling water that has cooled the cylinder head 31, but with respect to the cooling water that has cooled the cylinder head 31. The cooling water in which a part of the cooling water for cooling the cylinder block 32 is mixed may be used. In short, it is only necessary that the cooling water mainly cooling the cylinder head 31 flows out from the first cooling water outlet 31b of the engine 30.

  Similarly, the cooling water flowing out from the second cooling water outlet 32b of the engine 30 was only the cooling water that cooled the cylinder block 32, but the cylinder head 31 was cooled with respect to the cooling water that cooled the cylinder block 32. Cooling water mixed with a part of the cooling water may be used. In short, the cooling water mainly cooling the cylinder block 32 flows out from the second cooling water outlet 32b of the engine 30, and the cooling water flowing out from the second cooling water outlet 32b rather than the cooling water flowing out from the first cooling water outlet 31b. As long as the temperature is higher.

  However, the cooling water flowing out from the second cooling water outlet 32b of the engine 30 has a higher temperature than when all of the cooling water after cooling the cylinder head 31 and the cooling water after cooling the cylinder block 32 are mixed. To do. Thereby, it is because a high temperature cooling water can be made to flow out from the engine 30 compared with the case where both cooling water is mixed together.

  (3) In each of the embodiments described above, the cooling water flowing into the second heater core 20 was only the cooling water flowing out from the second cooling water outlet 32b of the engine 30, but the cooling water flowing out from the first cooling water outlet 31b. A part of the cooling water may be mixed.

  In short, it is only necessary that the cooling water mainly flows out from the second cooling water outlet 32 b and has a higher temperature than the cooling water flowing into the first heater core 10 and flows into the second heater core 20. However, the cooling water flowing into the second heater core 20 has a temperature higher than the average temperature when the cooling water flowing out from the second cooling water outlet 32b and the cooling water flowing out from the first cooling water outlet 31b are all mixed. . This is because the air temperature after heating by the second heater core 20 can be increased as compared with the case where both the cooling waters are all mixed.

  (4) In each of the above-described embodiments, the first heater core 10 uses the cooling water after cooling the cylinder head as a heat source, and the second heater core 20 uses the cooling water after cooling the cylinder block as a heat source. The two heater core 20 may use another liquid as a heat source. The present invention can be applied when the first heater core 10 uses the first liquid as a heat source and the second heater core 20 uses the second liquid having a higher temperature and a lower flow rate than the first liquid as a heat source.

  For example, in a vehicle air conditioner mounted on a hybrid vehicle, the coolant of an electric device such as an inverter can be used as the first liquid, and the engine coolant can be used as the second liquid. Further, for example, in a vehicle air conditioner mounted on an electric vehicle, a cooling liquid of an electric device such as an inverter is used as the first liquid, and a high-temperature liquid heated by heating means such as an electric heater is used as the second liquid. Can do. Thus, the vehicle air conditioner of the present invention can be mounted on vehicles other than hybrid vehicles.

DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 2 Heating heat exchanger 10 1st heater core (1st heat exchange part)
10a Cooling water inlet (first liquid inlet)
10b Cooling water outlet (first liquid outlet)
DESCRIPTION OF SYMBOLS 11 Tube 12 Inlet side tank part, 1st tank part 13 Outlet side tank part, 2nd tank part 20 2nd heater core (2nd heat exchange part)
20a Cooling water inlet (second liquid inlet)
20b Cooling water outlet (second liquid outlet)
21 Tube 22 Inlet side tank part, first tank part 23 Outlet side tank part, second tank part

Claims (3)

A heat exchanger (2) for heating that heats the air blown into the vehicle interior using the first liquid and the second liquid having a higher temperature and a lower flow rate than the first liquid as a heat source,
The heating heat exchanger (2) is heated by the first heat exchange unit (10) for exchanging heat between the first liquid and the blown air, and the second liquid and the first heat exchange unit (10). A second heat exchange section (20) for exchanging heat with the blown air,
Said first heat exchange unit (10) is left-right direction end side and thereby have a inlet (10a) of said first liquid downward, the first liquid outlet above the heating heat exchanger (2) the (10b) possess,
Said second heat exchange unit (20) is configured to have a second inlet of the liquid (20a) in the left-right direction end side and the lower side of the heating heat exchanger (2), of the second liquid upwardly air conditioning system characterized by chromatic outlet (20b). The first and second heat exchange sections (10, 20) are both in communication with the plurality of stacked tubes (11, 21) and one end in the longitudinal direction of the plurality of tubes (11, 21). An inlet side tank portion (12, 22) serving as an inlet side and an outlet side tank portion (13, 23) serving as a liquid outlet side communicating with the other end in the longitudinal direction of the plurality of tubes (11, 21). Prepared,
The inlet side tank parts (12, 22) of the first and second heat exchange parts (10, 20) are positioned on the lower side, and the outlet side of the first and second heat exchange parts (10, 20). The tank parts (13, 23) are located on the upper side,
The first heat exchange part (10) is provided with an inlet (10a) for the first liquid on one end side in the left-right direction of the heat exchanger for heating (2) in the inlet side tank part (12),
The second heat exchange part (20) is provided with an inlet (20a) for the second liquid on the other end side in the left-right direction of the heating heat exchanger (2) in the inlet side tank part (22). The vehicle air conditioner according to claim 1 , wherein The first and second heat exchange sections (10, 20) are both in communication with the stacked tubes (11, 21) and one end side in the longitudinal direction of the tubes (11, 21). A tank portion (12, 22) and a second tank portion (13, 23) communicating with the other end in the longitudinal direction of the plurality of tubes (11, 21),
The first tank portions (12, 22) of the first and second heater cores (10, 20) are positioned on one side of the heating heat exchanger (2) in the left-right direction, and the first and second heater cores ( 10, 20 of the second tank parts (13, 23) are located on the other side in the left-right direction of the heat exchanger for heating (2),
The first heat exchange part (10) is provided with a partition wall (16) inside the first tank part (12), and is lower than the partition wall (16) of the first tank part (12). The first liquid inlet (10a) is provided in the part, and the first liquid outlet (10b) is provided in the upper part of the partition wall (16) of the first tank part (12);
The second heat exchange part (20) is provided with a partition wall (26) inside the second tank part (23), and is lower than the partition wall (26) of the second tank part (23). The inlet of the second liquid (20a) is provided in the portion, and the outlet of the second liquid (20b) is provided in the upper portion of the partition wall (16) of the second tank portion (23). The vehicle air conditioner according to claim 1 .

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