JP2005221093A - Heat exchanger for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger for a vehicle, improved in heat exchange effectiveness. <P>SOLUTION: An elastic deformed part 6 is provided on each plate part 5 of fins 3 stacked on a radiator, and the elastic deformed parts 6 are connected to each other to form a connecting member 7, which is thermally deformed to be freely expanded and contracted. The connecting member 7 is provided in the longitudinal direction of the tube 2, whereby the connecting member 7 is contracted in the region where the air passing the radiator has high flow velocity and low temperature so that the space between the plate parts 5 of the fins gets narrower to increase the heat exchange amount, and the contracted connecting member 7 is pulled in the region where the flow velocity of air is low and the temperature of the air is high so that the space between the plate parts 5 of the fins 3 gets wider to decrease ventilation resistance. Further, the vacuum effect of the fan is added to increase the heat exchange amount more than before, so that the heat exchange effectiveness can be remarkably improved than that of the conventional radiator. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an improvement in a vehicle heat exchanger, and more particularly, a vehicle heat exchanger provided with corrugated fins.

Generally, a vehicle heat exchanger such as a radiator or a condenser that cools cooling water from an engine is disposed in front of the vehicle.
A radiator 50, which is a conventional vehicle heat exchanger, will be described with reference to FIGS.
As shown in FIG. 3, the radiator 50 includes a plurality of vertically long tubes 2 arranged side by side at predetermined intervals in the horizontal direction, and is in contact with each tube 2 and is laminated between the tubes 2 in the longitudinal direction of each tube 2. And the upper tank 10 and the lower tank 11 that are disposed in the upper and lower portions of each tube 2, communicate with each tube 2 and temporarily store cooling water, Heat exchange is performed between the air passing between the fins 51 and the refrigerant flowing in each tube 2.
Here, in the conventional radiator 50, as shown in FIG. 4 showing an enlarged portion A of FIG. 3, the fins 51 come into contact with each other between the adjacent tubes 2 and 2 at a predetermined pitch P, and A plurality of layers are stacked in the longitudinal direction.

  Further, as a conventional technique for improving the heat exchange rate between the air passing between the fins and the refrigerant in the tube, Patent Document 1 arranges the refrigerant passages and fins alternately in a plurality of rows and arranges the fins. In the vehicle heat exchanger that performs heat exchange between the air passing through the refrigerant and the refrigerant flowing in the refrigerant passage, by providing an air flow disturbance portion at the air inflow side edge of the fin, It is disclosed that the inflowing air collides with the airflow disturbance unit to form a turbulent flow, thereby improving the heat exchange rate.

  Further, in Patent Document 2 and Patent Document 3, by arranging a plate made of a shape memory alloy behind the radiator, the plate becomes curved when the temperature exceeds the set temperature, and the amount of air flowing into the radiator is increased. In addition, it is disclosed that when the temperature is equal to or lower than the set temperature, the plate becomes flat and the amount of air flowing into the radiator is reduced to efficiently perform heat exchange.

Japanese Utility Model Publication No. 3-124175 Japanese Utility Model Publication No. 62-145821 Japanese Utility Model Publication No. 1-97033

  However, in the invention of Patent Document 1, the air flow disturbing portion provided at the air inflow side edge of the fin causes the air flowing between the fins of the radiator to branch in various directions to form a turbulent flow to However, there is room for improvement because the heat exchange rate of the part where the amount of air flowing into the radiator is small (the flow rate is slow) is not taken into consideration. In other words, a bumper or the like is arranged in front of the radiator, and the flow velocity of the air passing through the radiator varies greatly depending on the position of the grille hole of the bumper. It hardly contributes and the performance of the heat exchanger is not fully demonstrated.

  Therefore, at the manufacturing stage of the radiator, it is possible to improve the heat exchange rate by reducing the fin pitch at the part where the air flow rate is high and increasing the fin pitch at the part where the air flow rate is low. In this case, the conditions are restricted, and for example, efficient heat exchange cannot be performed under various conditions such as idling, high speed traveling, and uphill traveling.

  Further, in the inventions of Patent Document 2 and Patent Document 3, an attempt is made to improve the heat exchange rate by arranging a plate or the like made of a shape memory alloy behind the radiator, but the amount of air flowing into the radiator is taken into consideration. Therefore, the heat exchange rate cannot be improved at a site where the air inflow amount is small.

  This invention is made | formed in view of this point, and it aims at providing the heat exchanger for vehicles which improves a heat exchange rate.

According to the present invention, as means for solving the above-mentioned problems, in the invention described in claim 1, a plurality of tubes are arranged in parallel at predetermined intervals, and fins are interposed between the tubes in a stacked state. In the vehicle heat exchanger that performs heat exchange between the refrigerant flowing inside the tube and the air passing through the fin, the fin includes a contact portion that contacts the tube, and the mutual Each plate portion laminated between the contact portions, each plate portion is provided with an elastic deformation portion, a connecting member for connecting the elastic deformation portions is provided along the longitudinal direction of the tube, and the connection member is provided It is characterized by comprising a member that is thermally deformable in a stretchable manner.
By comprising in this way, a fin pitch is changed according to a driving | running | working state, a fin is collected in the location where driving wind hits a lot, and the surface area of the fin which hits driving wind is increased.

The invention described in claim 2 is characterized in that, in the invention described in claim 1, the elastically deforming portion of the plate portion has a bellows shape.
By comprising in this way, the surface area of the whole fin is further increased.

The invention described in claim 3 is characterized in that, in the invention described in claim 1 or 2, the connecting member has a bellows shape.
With this configuration, the amount of deformation can be increased by the bellows shape, so that the variable amount of the fin pitch is further increased.

The invention described in claim 4 is characterized in that, in the invention described in any one of claims 1 to 3, the plate portion of the fin on the end side of the tube is formed of a non-deformable member. is there.
With this configuration, even if the connecting member expands and contracts, the fins arranged on the end side of the tube are not deformed and do not contact the upper tank or the lower tank.

According to the present invention, each fin includes a contact portion that comes into contact with each tube, and a plate portion that is stacked between the contact portions. The elastic deformation portion is provided on the plate portion, and the elastic deformation portion. Since the connecting member for connecting each other is provided along the longitudinal direction of the tube, and this connecting member is composed of a member that is thermally deformable in a stretchable manner, the connecting member that expands and contracts between the stacked plates due to a temperature change is provided. It becomes dense or sparse, and the fin pitch can be automatically adjusted according to various driving conditions, and the surface area of the fin that hits the driving wind is reduced by making the space between the plates where the flow speed of the driving wind is high close. It is possible to increase the heat exchange rate.
In addition, the elastic deformation portion and the connecting member of each plate portion are formed in a bellows shape, thereby increasing the deformation amount of each plate and increasing the surface area of the fin plate portion where the traveling wind hits to further increase the heat exchange rate. Can be improved.
Furthermore, by configuring the plate portion arranged on the end side between the tubes with a non-deformable member, the plate portion does not contact the upper tank or the lower tank even if the fin is deformed, and therefore deterioration of the fin can be prevented. .

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to FIGS. 1 and 2 and with reference to FIG. The same members and corresponding parts as in the conventional example will be described using the same reference numerals.
Since the configuration of the vehicle heat exchanger (hereinafter referred to as a radiator) 1 according to the embodiment of the present invention is the same as that of the conventional radiator 50 shown in FIG. 3, the description thereof is omitted here.
As shown in FIG. 1, the radiator 1 according to the embodiment of the present invention has a plurality of fins 3 interposed between the tubes 2 in the longitudinal direction of the tubes 2. Is made of an elastically deformable metal provided with a contact portion 4 that contacts the tube 2 and a plate portion 5 that extends between the left and right contact portions 4.

  Each plate portion 5 is provided with a predetermined range of an elastic deformation portion 6 near the center thereof, and the elastic deformation portion 6 is formed in a bellows shape so as to be elastically deformable. In addition, a connecting member 7 extending along the longitudinal direction of the tube 2 is connected to the elastic deformation portion 6 at the center of the plate portion 5 of each of the fins 3 stacked by a connecting means (not shown). Are connected by a connecting member 7. The connecting member 7 is made of a member made of a shape memory alloy that is thermally deformable in a stretchable manner, and has a bellows shape. Further, the connecting means is connected so that the elastically deforming portion 6 of the fin 3 can follow when the connecting member 7 expands and contracts due to a temperature change.

  Further, as shown in FIGS. 1 and 2, the plate portion 5a of the fin 3 disposed at the end of the tube 2 on the upper tank 10 (see FIG. 3) side is formed of a non-deformable member, and the connecting member 7 expands and contracts. Even if it is, it is comprised so that it may not deform | transform. In addition, the plate part of the fin 3 arrange | positioned at the edge part by the side of the lower tank 11 (refer FIG. 3) of the tube 2 is also formed with the non-deformable member.

Next, the operation of the radiator 1 according to the embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 2, the portion where the flow velocity of air into the radiator 1 is high and the temperature is low (part B in FIG. 1) is connected by the connecting member 7 as the connecting member 7 contracts in the direction of arrow C. As the elastically deforming portions 6 of the plate portions 5 of the fins 3 gathered in the B portion, the space between the plate portions 5 of the B portion becomes dense, and the surface area of the fins 3 hitting the traveling wind increases. The amount of heat exchange is increased.
On the other hand, the portion where the passage speed of air into the radiator 1 is slow and the temperature is high (other than the portion B in FIG. 2) is pulled by the contracting connecting member 7, so that the interval between the plate portions 5 of the fins 3 is increased. It becomes sparse and the ventilation resistance is reduced, and the suction effect of a fan (not shown) is added, so that the heat exchange amount is increased as compared with the conventional case.
Further, when the fan has the air flow velocity into the radiator 1 during idling or the like, the pitch of the fins 3 is automatically constant, and there is no difference in the amount of heat exchange.

  As described above, according to the radiator 1 according to the embodiment of the present invention, each plate portion 5 of the fins 3 to be stacked is provided with the elastic deformation portion 6 having a bellows shape, and the elastic deformation portion 6 of each plate portion 5 is provided. Are connected along the longitudinal direction of the tube 2 by the connecting member 7 made of a member that is thermally deformable in a stretchable manner. Therefore, the portion where the flow velocity of air into the radiator 1 is high and the temperature is low is the connecting member 7. As a result of the contraction, the space between the plate portions 5 of the fins 3 becomes close and the amount of heat exchange increases, and the portion where the flow rate of air into the radiator 1 is slow and the temperature is high is a connecting member that contracts. Since the distance between the plate portions 5 of each fin 3 becomes sparse by being pulled by 7, the airflow resistance is reduced, and the heat suction amount of the fan is increased and the heat exchange amount is increased as compared with the conventional radiator. 50 Remote heat exchange rate between the refrigerant flowing through the air and the tube 2 passing between the fins 3 can be greatly improved.

  In the above embodiment, the range in which the plate portion 5 having the elastic deformation portion 6 and the connecting member 7 for connecting the plate portions 5 are not particularly limited, and may be provided on the entire surface of the radiator 1. Department may be sufficient. A configuration in which the plate portion 5 having the elastic deformation portion 6 is provided at a predetermined interval, that is, a configuration in which the plate portion 5 having no elastic deformation portion 6 is interposed between the plate portions 5 having the elastic deformation portion 6. But you can. In particular, it is preferable to provide the plate portion 5 having the elastic deformation portion 6 at a location where the traveling wind efficiently hits.

FIG. 1 is a view showing a laminated state of fins which is a configuration of a radiator which is a vehicle heat exchanger according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a state where the fin is deformed. FIG. 3 is a diagram illustrating a configuration of a general radiator. FIG. 4 is an enlarged view of a portion A in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Radiator 2 Tube 3 Fin 4 Contact part 5 Plate part 6 Elastic deformation part 7 Connection member

Claims (4)

A plurality of tubes are arranged in parallel at predetermined intervals, fins are interposed between the tubes, and heat exchange is performed between the refrigerant flowing inside the tubes and the air passing through the fins. In the vehicular heat exchanger,
The fin includes a contact portion that contacts the tube and each plate portion that is stacked between the contact portions, and an elastic deformation portion is provided on each plate portion, and the elastic deformation portions are connected to each other. A vehicle heat exchanger characterized in that a member is provided along the longitudinal direction of the tube, and the connecting member is formed of a member that is thermally deformable in a stretchable manner. The vehicle heat exchanger according to claim 1, wherein the elastic deformation portion of the plate portion has a bellows shape. The vehicle heat exchanger according to claim 1 or 2, wherein the connecting member has a bellows shape. The vehicle heat exchanger according to any one of claims 1 to 3, wherein the plate portion of the fin on the end side of the tube is formed of a non-deformable member.

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