JP2010127508A - Combined heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combined heat exchanger compact in size capable of preventing the accumulation of oil mixed in a refrigerant and having high heat exchanging efficiency. <P>SOLUTION: In the combined heat exchanger 1 including a first air-cooled heat exchanger 5 for cooling water for a heating element 3 excluding an engine of an automobile, and a second air-cooled heat exchanger 7 for cooling a refrigerant for air-conditioning a cabin, the first air-cooled heat exchanger 5 has an inflow-side tank 11 into which the cooling water flows, and an outflow-side tank 13 from which the cooling water flows out, flow channel members 15 making the tanks 11, 13 communicated with each other, radiation fins 17 stacked alternately with the flow channel members 15, and a water-cooled heat exchanger 19 for cooling the refrigerant for air-conditioning the cabin. The water-cooled heat exchanger 19 is disposed in of the outflow-side tank 13, and the refrigerant flows in from an upper part of the water-cooled heat exchanger 19, then flows out from a lower part, and flows down to the second air-cooled heat exchanger 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a composite heat exchanger that handles a plurality of refrigerants (for example, cooling water for a radiator and a refrigerant for air conditioning) in a cooling system for an automobile.

  Patent Document 1 describes “a heat exchanger and a vehicle air conditioner”.

This heat exchanger is used in a vehicle air conditioner, and incorporates a heat exchanger for air conditioning refrigerant into the tank (header) of the air cooling heat exchanger for engine cooling water, and is used for air conditioning with air cooled cooling water. The refrigerant is cooled, and in this refrigerant heat exchanger, the refrigerant flows in from below and flows out from above.
JP 2006-162176 A

  The refrigerant for air conditioning circulates in the system in a state where the oil of the compressor is mixed, and the mixed oil exists in a state where a part of the mixed oil is separated from the refrigerant.

  As described above, in the heat exchanger of Patent Document 1, since the refrigerant is moved from below to above, oil may stay in the lower part of the heat exchanger. In addition, the lack of lubrication of the compressor can reduce the performance and reliability of the cooling system.

  Further, in recent vehicles, there are heating elements such as an internal combustion engine, an intercooler for a supercharger, an air conditioner, and an electric motor of a hybrid electric vehicle, and these heating elements are cooled (heat from the heating element). There is a need for a compact and efficient heat exchanger (composite heat exchanger).

  Accordingly, an object of the present invention is to provide a compact composite heat exchanger that prevents the stagnation of oil mixed in the refrigerant and is excellent in heat exchange efficiency.

  The composite heat exchanger according to claim 1 includes a first air-cooling heat exchanger that cools cooling water for a heating element other than an automobile engine, and a second air-cooling heat exchanger that cools a refrigerant for air conditioning in the passenger compartment. A composite heat exchanger used in the cooling system, wherein the first air-cooling heat exchanger includes an inflow side tank into which cooling water flows and an outflow side tank from which the cooling water flows, and a flow path member that connects the two tanks; And a heat-radiating fin alternately stacked with the flow path member, and a water-cooled heat exchanger that cools a refrigerant for air-conditioning of the passenger compartment, the water-cooled heat exchanger being disposed inside the tank, The air-cooled heat exchanger is disposed below the first air-cooled heat exchanger, and the refrigerant flows from above the water-cooled heat exchanger, flows out from below, and then flows into the second air-cooled heat exchanger. And

  A second aspect of the present invention is the composite heat exchanger according to the first aspect, wherein the first air-cooled heat exchanger and the second air-cooled heat exchanger are the same orthogonal to the flow of cooling air that cools them. It is arrange | positioned on the surface and the 2nd air cooling heat exchanger is arrange | positioned adjacent to a 1st air cooling heat exchanger, It is characterized by the above-mentioned.

  A third aspect of the present invention is the composite heat exchanger according to the first or second aspect, wherein the water-cooled heat exchanger includes a plurality of refrigerant flow path members serving as refrigerant flow paths, and cooling water. The refrigerant flow path member is arranged so that the flow of the refrigerant is in a substantially vertical direction.

  A fourth aspect of the present invention is the composite heat exchanger according to the third aspect, wherein at least a lower portion of the refrigerant flow path member is formed in a substantially arc shape.

  A fifth aspect of the present invention is the composite heat exchanger according to the third or fourth aspect, wherein the refrigerant flow path members are fixed to each other to form a refrigerant flow path therein, and the flow of the refrigerant A pair of shell tubes provided with refrigerant inlets and outlets provided in the vicinity of both ends in the direction, and refrigerant inlets fixed to the inside of both shell tubes and respectively corresponding to the refrigerant inlets and outlets And an inner fin having an outlet and a plurality of grooves formed along the flow of the refrigerant. The inner fin communicates with the inlet and the outlet of the inner fin, and the width direction of the flow. A notch for diffusing and converging the refrigerant to improve heat exchange efficiency is provided.

  A sixth aspect of the present invention is the composite heat exchanger according to the third or fourth aspect, wherein the refrigerant flow path members are fixed to each other to form a refrigerant flow path therein, and the flow of the refrigerant A pair of shell tubes provided with refrigerant inlets and outlets provided in the vicinity of both ends in the direction, and refrigerant inlets fixed to the inside of both shell tubes and respectively corresponding to the refrigerant inlets and outlets And an inner fin provided with an outlet and a plurality of grooves formed along the flow of the refrigerant, and the inner fin includes an inlet side and an outlet side fixing portion of the shell tube. It is provided with a notch that diffuses and converges the refrigerant in the width direction of the flow to improve heat exchange efficiency.

  The composite heat exchanger according to claim 1 is configured such that the refrigerant flows in from the upper side of the water-cooled heat exchanger and flows out from the lower side. Therefore, unlike the conventional example, the oil is suppressed from staying in the lower portion and heat exchange is performed. The efficiency is improved and insufficient lubrication of the compressor due to oil stagnation and deterioration of the performance and reliability of the cooling system are prevented. Moreover, if a water-cooled heat exchanger is arrange | positioned in the outflow side tank after being cooled, the heat exchange efficiency so much is obtained.

  In addition, since the refrigerant that has flowed out of the water-cooled heat exchanger flows down to the second air-cooled heat exchanger disposed below the first air-cooled heat exchanger, the water-cooled heat exchanger, the second air-cooled heat exchanger, The oil retention control function is greatly improved.

  In particular, in an apparatus such as a condenser or the above-described water-cooled heat exchanger in which the refrigerant is condensed and the volume is reduced, the flow rate is decreased, and the above-described effect due to the suppression of oil retention is remarkable.

  The composite heat exchanger of claim 2 can obtain the same effect as that of the structure of claim 1.

  The first air cooling heat exchanger and the second air cooling heat exchanger are arranged on the same plane orthogonal to the flow of the cooling air, and the first air cooling heat exchanger and the second air cooling heat exchanger are arranged adjacent to each other. As a result, the composite heat exchanger is extremely compact and has excellent on-vehicle properties. Therefore, it is used for vehicle cooling systems, and is used in engines, intercoolers for turbochargers, air conditioners, hybrid electric A heating element such as an electric motor of an automobile can be effectively cooled.

  The composite heat exchanger of claim 3 can obtain the same effect as that of the structure of claim 1 or claim 2.

  In addition, since the water-cooled heat exchanger is installed vertically so that the refrigerant flows substantially vertically (flows down) in the flow path member, a high oil retention effect is obtained.

  The composite heat exchanger of claim 4 can achieve the same effect as that of the structure of claim 3.

  In addition, since at least the lower part of the refrigerant flow path member is formed in a substantially circular arc shape, the oil flow becomes smooth, partial retention is suppressed, and the oil retention effect is further improved.

  Further, if the upper part of the refrigerant flow path member is formed in a substantially arc shape, the refrigerant is diffused in the width direction of each inner fin along the flow, so that the efficiency of heat exchange with the cooling water is further improved.

  The composite heat exchanger according to claim 5 can achieve the same effect as the structure of claim 3 or claim 4.

  In addition, by providing the inner fin with a notch communicating with its own inlet and outlet, the refrigerant is diffused and converged in a direction perpendicular to the flow, so that the heat exchange efficiency and the oil retention suppression effect are improved. improves.

  In addition, the pressure resistance of the shell tube is maintained high by fixing the inner fin on the inside.

  The composite heat exchanger according to claim 6 can achieve the same effects as the structure according to claim 3 or claim 4.

  In addition, since the inner fins are provided with notches along the fixed portions on the inlet and outlet sides of the shell tube, the refrigerant is diffused and converged in a direction orthogonal to the flow. The retention suppressing effect is improved.

  In addition, the pressure resistance of the shell tube is maintained high by fixing the inner fin on the inside.

<First embodiment>
The composite heat exchanger 1 (first embodiment of the present invention) will be described with reference to FIGS. The composite heat exchanger 1 is used in a cooling system 9 of a hybrid electric vehicle using an engine (internal combustion engine) and an electric motor 3 as driving power sources. FIG. 1 is a schematic diagram showing a part of the cooling system 9. 2 is a perspective view showing a state in which the composite heat exchanger 1, the cooling water sub-radiator 5 such as the electric motor 3 and the engine cooling water radiator 27 are combined, FIG. 3 is a perspective view of the sub-radiator 5, and FIG. FIG. 5 is a side view of the water-cooled heat exchanger 19, FIG. 6 is a perspective view of the water-cooled heat exchanger 19, and FIG. 7 is a water-cooled heat exchanger 19 incorporated in the outflow side tank 13 of the sub-radiator 5. FIG. 3 is an exploded perspective view of the cold heat exchanger 19.

  The composite heat exchanger 1 includes a sub-radiator 5 (first air-cooling heat exchanger) that cools cooling water for a drive device 3 and a control device (a heating element other than the engine) such as an inverter and a converter, and a vehicle compartment air conditioner. The sub-radiator 5 includes an inflow side tank 11 into which cooling water flows in and an outflow side tank 13 into which cooling water flows out, and is used in a cooling system 9 having a condenser 7 (second air cooling heat exchanger) for cooling the refrigerant. The flat tubes 15 (flow path members) for communicating the tanks 11 and 13, the heat radiation fins 17 alternately stacked with the flat tubes 15, and the water-cooled heat exchanger 19 for cooling the refrigerant for air conditioning in the passenger compartment. 4 and 5, the water-cooled heat exchanger 19 is disposed inside the outflow side tank 13, and as shown in FIG. 2, the condenser 7 is disposed below the sub-radiator 5, and as shown in FIG. Refrigerant is water-cooled heat exchanger It flows from above the vessel 19, after flowing out from the lower, flows down to the capacitor 7.

  Further, as shown in FIG. 2, the sub-radiator 5 and the condenser 7 are arranged on the same plane substantially orthogonal to the flow of cooling air (outside air flowing in from the front grill during traveling of the vehicle) for cooling them. The sub radiators 5 are arranged adjacent to each other.

  Further, as shown in FIG. 5, the water-cooled heat exchanger 19 has gaps 25 between the plurality of shell tubes 21 and 23 (refrigerant flow path members) serving as refrigerant flow paths. The shell tubes 21 and 23 are vertically arranged so that the flow of the refrigerant is substantially vertical (the direction of gravity).

  Moreover, the upper part and the lower part (at least lower part) of the shell tubes 21 and 23 are formed in the substantially circular arc shape.

  The sub-radiator 5 is attached with a reinforcement 26 (reinforcing member) on the upper and lower portions of the laminated flat tubes 15 and applies an appropriate load in the laminating direction to both ends of the flat tubes 15 to the tanks 11 and 13. It is formed by inserting.

  Further, as shown in FIG. 2, the sub-radiator 5 and the condenser 7 are vertically arranged in this order, and an engine radiator 27 is disposed downstream of the cooling air to cool the engine cooling water by the cooling air. .

  As shown in FIGS. 5 and 7, the water-cooled heat exchanger 19 includes shell tubes 21 and 23, inner fins 29 (refrigerant flow path members), a ring-shaped patch 31, and a plate-shaped sealing end patch 33. Has been. Further, as shown in FIGS. 4 and 6, the shell tubes 21 and 23 have edge portions 35 and 37, one of which is fitted into the other to form a seal, and beads 39 and 41 (protrusions) that are orthogonally opposed to each other. , Provided at the upper and lower sides (near both ends in the refrigerant flow direction), one of which is inserted into the other and has an inflow port 43, 45 and an outflow port 47, 49, and the inner fin 29 is It has inflow ports 51 and 53 corresponding to the inflow ports 43 and 45 and the outflow ports 47 and 49, respectively, and a large number of grooves 55 formed by processing the whole into a corrugated shape and along the flow of the refrigerant.

  The shell tubes 21 and 23 sandwich the inner fins 29, and the edge portions 35 and 37 are inserted into each other to form a seal tube. The shell tubes ASSY are formed into the inlet ports 43 and 45 and the outlet ports 47. , 49 are inserted into each other to form an indicium, the patch 31 is sandwiched therebetween, the beads 39, 41 are brought into contact with each other and laminated, a certain appropriate load is applied in the laminating direction, and the outermost shell tube 23 Inlet 45 and outlet 49 are sealed with end patch 33, and water-cooled heat exchanger 19 is formed by brazing together with patch 31 and beads 39, 41 while keeping gap 25 of each shell tube ASSY properly. To do. At this time, the corrugated top portions of the shell tubes 21 and 23 and the inner fin 29 are also brazed and joined. 2, 5, and 6, the inlet 43 of the innermost shell tube 21 is connected to the compressor side via an adapter 57, and the outlet 47 is connected to the condenser 7 side via an adapter 59. ing.

  In the cooling system 9, in the cooling system such as the drive motor 3, the cooling water circulated by the pump 61 flows into the tank 11 of the sub-radiator 5 and flows through each flat tube 15 as shown in FIGS. 2 and 3. It is cooled by cooling air through the radiation fins 17 and flows into the tank 13 to cool the drive motor 3 and the like.

  Further, the air-conditioning refrigerant compressed by the compressor into a high-temperature and high-pressure gas state flows into the shell tubes ASSY of the water-cooled heat exchanger 19 from the inlets 43 and 45 as shown in FIG. While flowing down 55, it is cooled by the cooling water flowing through the tank 13 of the sub-radiator 5 and flows out from the outlets 47 and 49 in a state where the degree of superheat is reduced or partially saturated, and further flows down Then, the refrigerant flows into the condenser 7 to be condensed, decompressed by the expansion valve, heat exchanged by the evaporator, compressed by the compressor, and this cycle is repeated.

  Next, the effect of the composite heat exchanger 1 will be described.

  Since the refrigerant moves in the water-cooled heat exchanger 19 from the upper side to the lower side (flows down), it is suppressed that the lubricating oil of the compressor mixed in the refrigerant stagnates downward, and the shell tubes 21 and 23 The effect of suppressing oil stagnation is improved by forming the lower part in a substantially circular arc shape, and the reduction of heat exchange efficiency due to oil stagnation and the performance and reliability of the cooling system 9 due to insufficient lubrication of the compressor are prevented.

  Further, the heat-cooling heat exchanger 19 is arranged in the outflow side tank 13 after the cooling water is cooled by the cooling air, so that a higher heat exchange efficiency is obtained.

  In addition, since the water-cooled heat exchanger 19 is placed vertically and the refrigerant flows down substantially in the vertical direction, the oil retention effect is further improved.

  Further, since the upper portions of the shell tubes 21 and 23 are also formed in a substantially arc shape, the refrigerant is diffused in the width direction of each inner fin 29 along the flow as indicated by an arrow 63 in FIG. The heat exchange efficiency is further improved.

  Further, in the water-cooled heat exchanger 19 and the condenser 7 in which the flow rate is lowered due to the condensation of the refrigerant and the volume being reduced, the above-described effect due to the suppression of oil retention is remarkable.

  Further, the sub-radiator 5 and the condenser 7 are arranged on the same plane orthogonal to the flow of the cooling air, and the condenser 7 is arranged adjacent to the lower side of the sub-radiator 5, so that the composite heat exchanger 1 is configured extremely compactly. Since it has excellent in-vehicle properties, it can be used in a vehicle cooling system 9 to effectively cool a heating element such as an engine, an air conditioner, and an electric motor 3.

<Second embodiment>
A second embodiment of the present invention will be described with reference to FIGS. 8 (a) and 8 (b).

  In the composite heat exchanger of the second embodiment, the inner fins 101 (refrigerant flow path members) fixed inside the shell tubes 21 and 23 extend to the arc portions at both ends in the flow direction of the shell tubes 21 and 23. Further, notches 103 and 105 communicating with the inflow port 51 and the outflow port 53, respectively, are provided on both sides in the width direction. The corrugated top of the inner fin 101 and both ends in the flow direction are brazed to the shell tube. For this reason, the tube pressure strength is secured up to the end in the flow direction.

  These notches 103 and 105 are provided over the entire width of the groove 55, and the refrigerant is diffused and converged in a direction (width direction) substantially perpendicular to the flow, and the refrigerant is spread over the entire width of the shell tubes 21 and 23. Since it is configured to flow, the contact area with the cooling water is enlarged, and the heat exchange efficiency is improved. Further, since the notch 105 is inclined so that the communication side of the outlet 53 is lowered, the oil is more reliably guided to the outlet by the inclined notch.

  The outer diameter r of the ring-shaped patch 31 is smaller than the outer diameter R of the inlets 43 and 45 and the outlets 47 and 49 side fixing portions 157 and 159 (FIG. 4) of the shell tubes 21 and 23. 105 extends from the outer periphery of the ring-shaped patch 31 to the outside. By providing the ring-shaped patch 31 between the adjacent tubes on the outer periphery of the inflow / outflow, the strength by the inner fin notches 103 and 105 is reinforced, and the durability is further improved.

  Further, both the inlet 51 and the outlet 53 are provided in the center of the inner fin 101 in the width direction, but the inlet 51 and the outlet 53 are offset in the width direction, and the notches 103 and 105 are correspondingly offset. If the lengths in the width direction are made unequal, the flow path length of the refrigerant is increased over the inflow port 51 side and the outflow port 53 side, and the heat exchange efficiency can be improved accordingly.

<Third embodiment>
A third embodiment of the present invention will be described with reference to FIGS. 9 (a) and 9 (b).

  In the composite heat exchanger of the third embodiment, notches 153 and 155 are provided in the inner fin 151 (refrigerant flow path member), and these notches 153 and 155 are the inlets 43, 45 and fixing portions 157 and 159 (FIG. 4) on the side of the outlets 47 and 49 are provided on both sides in the width direction.

  The notches 105 and 155 are provided over the entire width of the groove 55, and the coolant is cooled by diffusing and converging the refrigerant in a direction substantially perpendicular to the flow (width direction) and effectively using the entire width of the groove 55. The contact area with water is expanded to improve heat exchange efficiency.

  Also, in the inner fin 151, if the inflow port 51 and the outflow port 53 are offset in the width direction, and the lengths in the width direction of the notches 153 and 155 are made unequal in length, the flow rate is different from that of the inflow port 51 side. The flow path length of the refrigerant is increased over the outlet 53 side, and the heat exchange efficiency can be improved accordingly.

[Other Embodiments Included within the Scope of the Present Invention]
It should be noted that the present invention is not limited to the above-described embodiment, and various modifications can be made within the technical scope of the present invention.

2 is a schematic view showing a part of a cooling system 9. FIG. It is a perspective view which shows the state which combined the sub-radiator 5 for cooling water, such as the composite heat exchanger 1, the electric motor 3, and the radiator 27 for engine cooling water. 2 is a perspective view of a sub radiator 5. FIG. 4 is a cross-sectional view showing a water-cooled heat exchanger 19 incorporated in the outflow side tank 13 of the sub radiator 5. FIG. It is a side view of the water cooling heat exchanger 19. FIG. 2 is a perspective view of a water-cooled heat exchanger 19. FIG. 2 is an exploded perspective view of a water-cooled heat exchanger 19. FIG. (A) is a top view of the inner fin 101 used for 2nd Example, (b) is AA sectional drawing of Fig.8 (a). (A) is a top view of the inner fin 151 used for 3rd Example, (b) is BB sectional drawing of Fig.9 (a).

Explanation of symbols

1 Compound heat exchanger 3 Electric motors and control devices such as inverters and converters (heating elements other than engines)
5 Sub-radiator (first air-cooled heat exchanger)
7 Condenser (second air-cooled heat exchanger)
9 Cooling system 11 Inflow side tank 13 Outflow side tank 15 Flat tube (flow path member)
17 Radiation fins 19 Water-cooled heat exchangers 21, 23 Shell tubes (refrigerant flow path members)
29 Inner fin (refrigerant channel member)
43, 45 Inlet of shell tubes 21, 23 47, 49 Outlet of shell tubes 21, 23 51 Inlet of inner fin 29 53 Outlet of inner fin 29 55 Groove 101 of inner fin 29 Inner fin (refrigerant channel member) )
103, 105 Notch 151 of Inner Fin 101 Inner Fin (Refrigerant Channel Member)
153, 155 Notches 157, 159 of inner fin 151 Inlet ports 43, 45 and fixing portions on the side of outlet ports 47, 49 of shell tubes 21, 23

Claims (6)

A first air-cooled heat exchanger (5) that cools cooling water for a heating element (3) other than an automobile engine, and a second air-cooled heat exchanger (7) that cools a refrigerant for vehicle compartment air conditioning are provided. A combined heat exchanger (1) used in a cooling system (9),
The first air-cooling heat exchanger (5) includes an inflow side tank (11) into which cooling water flows in and an outflow side tank (13) from which outflow flows, and a flow path member (15) that connects the tanks (11, 13). ), Radiating fins (17) alternately stacked with the flow path members (15), and a water-cooled heat exchanger (19) for cooling the refrigerant for vehicle compartment air conditioning,
The water-cooled heat exchanger (19) is disposed inside the tank (11, 13),
The second air-cooled heat exchanger (7) is disposed below the first air-cooled heat exchanger (5),
The refrigerant flows from above the water-cooled heat exchanger (19) and flows out from below, and then flows into the second air-cooled heat exchanger (7). A composite heat exchanger (1) according to claim 1, comprising:
The first air-cooled heat exchanger (5) and the second air-cooled heat exchanger (7) are arranged on the same plane orthogonal to the flow of cooling air for cooling them, and the second air-cooled heat exchanger (7 ) Is arranged adjacent to the first air-cooled heat exchanger (5), the composite heat exchanger (1). A composite heat exchanger (1) according to claim 1 or claim 2,
The water-cooled heat exchanger (19) is formed by laminating a plurality of refrigerant flow path members (21, 23) serving as refrigerant flow paths while providing gaps (25) for the passage of cooling water therebetween. The composite heat exchanger (1), wherein the refrigerant flow path members (21, 23) are arranged so that the flow of the refrigerant is substantially vertical. A composite heat exchanger (1) according to claim 3, comprising:
The composite heat exchanger (1), wherein at least a lower part of the refrigerant flow path member (21, 23) is formed in a substantially arc shape. A composite heat exchanger (1) according to claim 3 or claim 4, wherein
The refrigerant flow path members are fixed to each other to form a refrigerant flow path therein, and refrigerant inlets (43, 45) and outlets (47, 49) provided near both ends of the refrigerant flow direction, A pair of shell tubes (21, 23) provided with both of them, fixed inside the shell tubes (21, 23), and corresponding to the refrigerant inlet (43, 45) and outlet (47, 49), respectively. An inner fin (101) having an inlet (51) and an outlet (53) for the refrigerant, and a plurality of grooves (55) formed along the refrigerant flow;
The inner fin (101) communicates with its own inlet (51) and outlet (53), and diffuses and converges the refrigerant in the width direction of the flow to improve heat exchange efficiency (103). , 105). A composite heat exchanger (1). A composite heat exchanger (1) according to claim 3 or claim 4, wherein
The refrigerant flow path members are fixed to each other to form a refrigerant flow path therein, and refrigerant inlets (43, 45) and outlets (47, 49) provided near both ends of the refrigerant flow direction, A pair of shell tubes (21, 23) provided with both of them, fixed inside the shell tubes (21, 23), and corresponding to the refrigerant inlet (43, 45) and outlet (47, 49), respectively. An inner fin (151) having a refrigerant inlet (51) and outlet (53) and a plurality of grooves (55) formed along the refrigerant flow;
The inner fin (151) is provided along the fixing portions (157, 159) on the inlet (43, 45) side and the outlet (47, 49) side of the shell tube (21, 23). The composite heat exchanger (1) is provided with notches (153, 155) for diffusing and converging the refrigerant in the width direction to improve heat exchange efficiency.

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