JP2007147126A - Heat exchanger for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radiator capable of preventing stress concentration to a tube of an outermost end by uniforming temperatures of tubes while securing rigidity of the radiator itself. <P>SOLUTION: In the heat exchanger for an automobile, a cooling air amount adjusting means 2 is provided between each side plate and the tube 13a of the outermost end for carrying out adjustment such that a cooling air amount passing between the side plate and the tube of the outermost end becomes less than cooling air amounts passing between other mutually adjacent tubes. The cooling air adjusting means is composed by a bent part 21 reducing an air passing area, formed by downwardly bending an air passing direction front side end of a fin 16 between the side plate and the tube of the outermost end into a substantially L-shape, so as to increase draft resistance of the cooling air amount passing between the side plate and the tube of the outermost end. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to an automotive heat exchanger formed by connecting a plurality of tubes so that cooling water can flow between tanks. Specifically, the temperature of each tube is equalized and positioned at the outermost end. It relates to measures to prevent stress concentration on the tube.

  In general, an automotive heat exchanger includes a plurality of tubes connected so that cooling water can flow between mutually facing tanks, and the plurality of tubes are connected to both the tanks via a core plate. Each of the tanks is fixed, and both ends of both tanks in the longitudinal direction of the core plate are connected by a connecting plate.

  By the way, each tube expands or contracts depending on the temperature of the cooling water flowing through it, but the connecting plate that extends in the same direction as each tube and is connected to the core plate is in direct contact with the cooling water. Therefore, the expansion and contraction according to the temperature of the cooling water is not performed like each tube. For this reason, when each tube expands and contracts, thermal stress acts on the fixing portion with the core plate, and the tube may be damaged.

Therefore, it has been known that the connecting plate is cut in the longitudinal direction to release the thermal stress acting on the fixing part with the core plate when each tube expands and contracts, thereby reliably preventing the tube from being damaged. (For example, refer to Patent Document 1).
JP-A-6-347191

  However, in the above-mentioned conventional one, since the connecting plate is cut in the longitudinal direction, when an external force such as a vehicle body vibration acts on the vehicle heat exchanger, the external force acts directly on the tube, The rigidity of the automotive heat exchanger itself is weak.

  In addition, since the connection plate is cooled by the cooling air passing between the connection plate and the outermost tube adjacent to the connection plate, the temperature of the cooling water flowing through the outermost tube is reduced by the fins. As a result, the outermost tube is excessively cooled as compared to the other tubes except the tube. In that case, the other tubes except the outermost tube are expanded by thermal expansion due to the temperature of the cooling water flowing through the inside, but the outermost tube is caused by a temperature difference from other tubes caused by excessive cooling. Therefore, tensile stress is concentrated on the outermost tube through the core plate that moves outward due to the extension of the other tubes.

  The present invention has been made in view of such points, and the object of the present invention is to make the temperature of each tube uniform and ensure the rigidity of the heat exchanger for an automobile itself, to the outermost tube. An object of the present invention is to provide an automotive heat exchanger capable of preventing stress concentration.

  In order to achieve the above object, in the present invention, the tanks facing each other are connected by a plurality of tubes so that cooling water can be circulated, and the plurality of tubes are connected to both the tanks via a core plate. A heat exchanger for automobiles is assumed on the assumption that the core plates are fixed to each other and the longitudinal ends of the core plate are connected by connecting plates. And there is provided a cooling air volume adjusting means for adjusting the cooling air volume passing between the connecting plate and the outermost tube adjacent to the connecting plate to be smaller than the cooling air volume passing between the tubes. Yes.

  Because of this specific matter, the longitudinal ends of each core plate are connected to each other by a connecting plate. Therefore, when an external force such as body vibration acts on the vehicle heat exchanger, the external force is directly applied to each tube. Therefore, the rigidity of the automotive heat exchanger itself is ensured.

  In that case, the amount of cooling air passing between the connecting plate and the outermost tube adjacent to the connecting plate is less than the amount of cooling air passing between the other tubes including the outermost tube. Since it is adjusted by the cooling air volume adjusting means, the temperature drop of the connecting plate cooled by the cooling air with a small cooling air volume passing between the connecting plate and the outermost tube is suppressed, and the inside of the outermost tube is Even if the temperature of the circulating cooling water is transmitted to the connection plate via the fins, the outermost tube is suppressed from being excessively cooled as compared with the other tubes. As a result, the temperature difference between the tubes is alleviated and becomes almost uniform, and the outermost tube also expands in parallel with the expansion due to the thermal expansion of the other tubes except this, and outwards from each other. It is possible to reliably prevent tensile stress that tends to concentrate on the outermost tube through the moving core plate.

  Further, in order to achieve the above object, in another solution provided by the present invention, a plurality of tubes are connected so that cooling water can be circulated between the opposing tanks, and the plurality of tubes are connected to each other. Similarly, it is premised on an automobile heat exchanger that is fixed to both tanks via a core plate and is connected between both longitudinal ends of the core plate by a connecting plate, and the core plate is connected to the connecting plate. There is a difference between the rigidity in the vicinity of the fixing part where the outermost tube adjacent to the fixing part is fixed and the rigidity in the vicinity of the fixing part where other tubes are fixed.

  Because of this specific matter, the longitudinal ends of each core plate are connected to each other by a connecting plate. Therefore, when an external force such as body vibration acts on the vehicle heat exchanger, the external force is directly applied to each tube. Therefore, the rigidity of the automobile heat exchanger itself is ensured in the same manner.

  In that case, each core plate is cooled by the cooling air because there is a difference between the rigidity in the vicinity of the fixing portion where the outermost tube is fixed and the rigidity in the vicinity of the fixing portion where the other tube is fixed. The cooling water temperature is transmitted to the connecting plate through fins and is cooled excessively, so that the outermost tube does not expand due to thermal expansion like other tubes due to the temperature difference with the other tubes. However, the tensile stress that tends to concentrate on the outermost tube through the core plate that is absorbed by the difference in rigidity near the anchoring area with respect to the core plate, and the difference in extension that occurs with the other tubes. Can be effectively prevented.

  Moreover, in addition to the cooling air volume adjusting means for reducing the cooling air volume passing between the connecting plate and the outermost tube less than the cooling air volume passing between the tubes, the vicinity of the fixing portion of the outermost tube described above When using a core plate where there is a difference between the rigidity of the tube and the rigidity near the other part where the tube is fixed, the connecting plate is cooled by the cooling air with a small amount of cooling air passing between the connecting plate and the outermost tube. The temperature difference between the tubes is almost uniformized, the difference in extension between the outermost tube and the other tubes is suppressed, and the suppressed extension difference is the core. Pull that tends to concentrate on the outermost tube through the core plate, which will be absorbed smoothly due to the difference in rigidity near the fixing site to the plate Stress can be more effectively prevented.

  In particular, the following configurations are listed as more specifically specifying the configuration of the core plate.

  That is, the core plate is formed so that the ventilation direction width of the portion located in the vicinity of the outermost tube is wider than the ventilation direction width of the portion located in the vicinity of the other tubes.

  With this specific matter, when the core plate is set so that the ventilation direction width of the portion located in the vicinity of the outermost tube is wider than the ventilation direction width of the portion located in the vicinity of the other tube, The tensile stress acting on the outermost tube when other tubes excluding the outermost tube are expanded due to thermal expansion is caused by the low rigidity part that has a wide width in the ventilation direction near the outermost tube and is easily bent. It is possible to effectively prevent tensile stress that is absorbed smoothly and concentrates on the outermost tube through the core plate.

  On the other hand, when the core plate is formed so that the ventilation direction width of the portion located near the tube at the outermost end is narrower than the ventilation direction width of the portion located near the other tube, The stress when the other tubes excluding the tube at the outer end expand due to thermal expansion is smoothly absorbed by the low-rigidity part that has a wide width in the ventilation direction and is easily bent in the vicinity of the other tube. It is possible to effectively prevent a tensile stress that tends to concentrate on the end tube.

  Further, in order to achieve the above object, in another solution provided by the present invention, a plurality of tubes are connected so that cooling water can be circulated between the opposing tanks, and the plurality of tubes are connected to each other. Similarly, it is premised on an automobile heat exchanger that is fixed to both tanks via a core plate and is connected between both longitudinal ends of the core plate by a connecting plate, and at least one of the two tanks. Water guide that actively guides cooling water to the outermost tube so that the flow rate of cooling water flowing in the outermost tube in one tank is larger than the flow rate of cooling water flowing in the other tubes. A board is provided.

  By this specific matter, the cooling water is actively introduced into the outermost tube by the water guide plate to suppress the temperature drop of the outermost tube, and the temperature difference between the tubes including the other tubes is further increased. It is relaxed and smoothed uniformly, and the outermost tube also extends completely in line with the thermal expansion of the other tubes except for this, and the outermost tube passes through the core plate moving outward. It becomes possible to more reliably prevent the tensile stress that tends to concentrate on the end tube. Furthermore, the temperature drop of the outermost tube can be easily suppressed only by providing a water guide plate in at least one of the two tanks, which is very advantageous in implementation.

  Moreover, in addition to the cooling air volume adjusting means for reducing the cooling air volume passing between the connecting plate and the outermost tube to be smaller than the cooling air volume passing between the tubes, at least one of the two tanks described above When a water guide plate is provided in the inside, cooling is performed to reduce the amount of cooling air passing between the water guide plate that actively introduces cooling water into the outermost tube and the connection plate and the outermost tube. The air flow adjustment means effectively suppresses the temperature drop of the outermost tube, and the temperature difference between each tube is made almost uniform. Thus, it is possible to more effectively prevent a tensile stress that tends to concentrate on the outermost tube through the core plates that move outward from each other.

  In addition to the core plate in which there is a difference between the rigidity in the vicinity of the fixing part of the tube at the outermost end and the rigidity in the vicinity of the fixing part of the other tube, a water guide plate is provided in at least one of the two tanks described above. When provided, cooling water is actively introduced into the outermost tube by the water guide plate, the temperature drop of the outermost tube is suppressed, and the temperature difference between the tubes is made almost uniform, In addition to suppressing the difference in extension between the tubes, the suppressed extension difference is smoothly absorbed by the difference in rigidity in the vicinity of the fixing portion with respect to the core plate. Thus, it is possible to more effectively prevent the tensile stress that tends to concentrate on the outermost tube.

  In short, in short, by connecting the two ends of both tanks in the longitudinal direction of the core plate with the connecting plate, it is possible to avoid the external force acting on the vehicle heat exchanger acting directly on each tube.

  And cooling air volume adjusting means for making the cooling air volume between the connecting plate and the outermost tube smaller than the cooling air volume between the tubes, rigidity near the fixing part of the outermost tube, and other tube fixing By using a core plate that has a difference in rigidity near the part or a water guide plate that actively guides cooling water to the outermost tube, while ensuring the rigidity of the automotive heat exchanger itself, The temperature between the tubes can be made almost uniform, and the tensile stress concentrated on the outermost tube can be surely prevented.

  The best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a front view of a radiator as an automotive heat exchanger according to a first embodiment of the present invention as viewed from the front of a vehicle body. The radiator 1 has a pair of upper and lower upper and lower ends extending substantially horizontally. A tank 11 (upper tank in FIG. 1) and a lower tank 12 (lower tank in FIG. 1) and the tanks 11 and 12 extend in a substantially vertical direction, and between the upper tank 11 and the lower tank 12. The plurality of tubes 13a and 13b are connected so that the cooling water can be circulated, and the cooling water flowing through the tubes 13a and 13b between the upper and lower tanks 11 and 12 is cooled by cooling air (running air). This is a so-called side flow type. The tubes 13a and 13b are attached to the upper and lower tanks 11 and 12 via a pair of upper and lower core plates 14 and 14 extending in a substantially horizontal direction. In this case, the upper and lower ends of each tube 13a, 13b are fixed to the core plates 14, 14 by brazing, respectively.

  The left and right ends of each core plate 14 are connected by panel-shaped side plates 15 and 15 as a pair of left and right connecting plates extending in a substantially vertical direction. Corrugated fins 16 are provided between the left and right side plates 15 and 15 and the outermost tubes 13a adjacent to the side plates 15 and between the adjacent tubes 13a, 13b and 13b. It is attached and the cooling effect of the cooling water which distribute | circulates the inside of each tube 13a, 13b is heightened. In this case, each of the tubes 13a and 13b has a substantially elliptical cross section arranged such that the cooling air flow direction is the major axis direction.

  As shown in FIG. 2, between each side plate 15 and the outermost tube 13a adjacent to the side plate 15, there is a space between the side plate 15 and the outermost tube 13a. Cooling air volume adjusting means 2 is provided for adjusting the cooling air volume to pass through the tubes 13a, 13b, 13b adjacent to each other to be smaller than the cooling air volume passing between the tubes. The cooling air volume adjusting means 2 is provided between the side plate 15 and the outermost tube 13a so as to increase the flow resistance of the cooling air flow passing between the side plate 15 and the outermost tube 13a. The fin 16 is provided with a bent portion 21 for bending the front end portion in the ventilation direction (the right end portion in FIG. 2) downward in a substantially L shape to reduce the ventilation area. Further, as shown in FIG. 3, the fins 16 between the outermost tube 13a and the other tubes 13b, 13b allow cooling air to flow so as to secure a ventilation area and not to increase the ventilation resistance of the cooling air volume. It is arranged to extend straight in the direction (substantially horizontal direction). In FIG. 1, 11 a is an inlet for introducing cooling water into the upper tank 11, and 12 a is an outlet for extracting cooling water from the lower tank 12.

  Therefore, in the first embodiment, the left and right ends of the core plates 14 of the upper and lower tanks 11 and 12 are connected to each other by the side plate 15, so that an external force such as vehicle body vibration acts on the radiator 1. In this case, the external force does not act directly on the tubes 13a and 13b, but acts on the side plates 15, and the rigidity of the radiator 1 itself is ensured.

  In this case, the amount of cooling air passing between the side plate 15 and the outermost tube 13a adjacent to the side plate 15 is larger than the amount of cooling air passing between the outermost tube 13a and the other tubes 13b, 13b. Cooling provided with a bent portion 21 for reducing the ventilation area by bending the front end portion of the fin 16 between the side plate 15 and the outermost tube 13a in a substantially L shape downwardly so that the ventilation area is reduced. Since it is adjusted by the air volume adjusting means 2, as shown in FIG. 4, in the present invention, the temperature of the side plate 15 cooled by the cooling air passing between the side plate 15 and the outermost tube 13a. Even when the temperature of the cooling water flowing through the outermost tube 13 a is transmitted to the side plate 15 via the fins 16, the decrease is suppressed compared to the conventional one. The tube 13a of the end is cooled excessively in comparison with the other tube 13b is suppressed as compared with the prior art. As a result, the temperature difference between the tubes 13a and 13b is alleviated and becomes almost uniform, and the outermost tube 13a also expands in a manner comparable to the expansion due to the thermal expansion of other tubes 13b. Therefore, it is possible to reliably prevent the tensile stress concentrated on the outermost tube 13a via the core plate 14 while ensuring the rigidity of the radiator 1 itself.

  Moreover, the cooling air volume adjusting means 2 is constituted by a bent portion 21 in which the front end portion in the ventilation direction of the fin 16 between the left and right side plates 15 and the outermost tube 13a is bent downward in a substantially L shape. Therefore, it is only necessary to bend the front end of the fin 16 in the ventilation direction into a substantially L shape without changing the layout of the existing fin 16 to form the bent portion 21, and the cooling air volume adjusting means 2 can be simplified. Can be configured.

  In the first embodiment, the cooling air volume adjusting means 2 is provided by the bent portion 21 in which the front end portion in the ventilation direction of the fin 16 between the side plate 15 and the outermost tube 13a is bent downward in a substantially L shape. The front end of the fin in the ventilation direction between the side plate and the outermost tube is bent in a substantially L shape upward, or between the side plate and the outermost tube. Bent part where the rear end of the fin in the ventilation direction is bent upward or downward in a substantially L shape, or the front end and rear end of the fin in the ventilation direction between the side plate and the outermost tube The cooling air flow rate adjusting means may be constituted by both bent portions that are bent in an approximately L shape upward or downward, and in this case also, ventilation between the side plate and the outermost tube is performed. Area is reduced and cooling air As the ventilation resistance increases, the amount of cooling air passing between the side plate and the outermost tube is adjusted to be smaller than the amount of cooling air passing between the other adjacent tubes. .

  Next, a second embodiment of the present invention will be described with reference to FIG.

  In the second embodiment, a water guide plate is provided in the tank in place of the cooling air volume adjusting means. The rest of the configuration excluding the cooling air volume adjusting means is the same as that of the first embodiment, and the same parts are denoted by the same reference numerals and detailed description thereof is omitted.

  That is, in the present embodiment, as shown in FIG. 5, in the upper tank 11 and the lower tank 12, the cooling water introduced into the outermost tube 13a is introduced into the other tubes 13b. Water guide plates 44 and 45 that are actively introduced as compared with water are provided.

  The water guide plate 44 in the upper tank 11 extends from a substantially central position in the vertical direction in the upper tank 11 in the left-right direction, and has a flat plate-like base portion 44a that divides the upper tank 11 in the vertical direction, and both left and right end portions of the base portion 44a. Bending portions 44b and 44b that are bent downward are provided. The water guide plate 44 is located between the left and right outermost tubes 13a at the left and right ends of the base portion 44a and the second tube 13b from the outermost end adjacent to the inside of the outermost tube 13a. It arrange | positions so that all the tubes 13b inside the tube 13a of the right and left outermost end may be covered from upper direction. In this case, the lower ends of the left and right bent portions 44b, 44b are arranged in a non-contact manner with a gap with respect to the lower surface in the upper tank 11, and the upper and lower portions of the water guide plate 44 that divides the upper tank 11 vertically. It enables circulation of cooling water in the space.

  And in the corresponding position (left end in FIG. 5) of the water guide plate 44 corresponding to the inlet 11a of the upper tank 11, a part of the cooling water introduced into the upper tank 11 from the water guide port 11a is placed below the water guide plate 44. On the other hand, a part of the cooling water introduced into the upper tank 11 is guided to the other tubes 13b except the outermost tube 13a. The remainder of the cooling water introduced into the inside is guided to the upper surface of the base portion 44a of the water guide plate 44 and is actively guided to the left and right outermost tubes 13a. That is, the water guide plate 44 in the upper tank 11 actively introduces the cooling water introduced into the outermost tube 13a from the introduction port 11a as compared with the cooling water introduced into the other tubes 13b. It has a function as the cooling water flow rate adjusting means 43.

  On the other hand, the water guide plate 45 in the lower tank 12 extends in the left-right direction at a substantially central position in the vertical direction in the lower tank 12, and has a flat plate-like base 45a that divides the lower tank 12 up and down, and both left and right ends of the base 45a. Bending portions 45b and 45b that are bent upward from the respective portions. The water guide plate 45 is located between the left and right outermost tubes 13a and the second tube 13b from the outermost end adjacent to the inner side of the outermost tube 13a. It arrange | positions so that all the tubes 13b inside the tube 13a of the right and left outermost end may be covered from the downward direction. In this case, the upper ends of the left and right bent portions 45b, 45b are arranged in a non-contact manner with a gap with respect to the upper surface in the lower tank 12, and the upper and lower portions of the water guide plate 45 that divides the lower tank 12 vertically. It enables circulation of cooling water in the space.

  Then, at the corresponding position (right end in FIG. 5) of the water guide plate 45 corresponding to the outlet 12a of the lower tank 12, the cooling water circulated in the other tubes 13b excluding the left and right outermost tubes 13a is led out. An opening 45c leading to 12a is provided.

  In this case, the cooling water flowing through the other tubes 13b except for the left and right outermost tubes 13a is once received by the water guide plate 45, and then the upper ends of the bent portions 45b and 45b and the upper surface of the lower tank 12 It flows to the space below the water guide plate 45 through the gap between the two and is led to the outlet 12a of the lower tank 12 through the opening 45c. On the other hand, the cooling water flowing through the right and left outermost tubes 13 a flows into the space below the water guide plate 45 without being received by the water guide plate 45 and is guided to the outlet 12 a of the lower tank 12. . That is, the water guide plate 45 in the lower tank 12 causes the cooling water introduced into the outermost tube 13a to be more actively led out from the outlet 12a than the cooling water introduced into the other tubes 13b. Thus, the water guide plate 45 in the lower tank 12 has a function of actively introducing the cooling water introduced into the outermost tube 13a in comparison with the cooling water introduced into the other tube 13b. have.

  Therefore, in the second embodiment, the cooling water is positively introduced into the outermost tube 13a by the water guide plates 44 and 45, and the temperature drop of the outermost tube 13a is suppressed, so that the space between the tubes 13a and 13b is reduced. The outermost tube 13a also expands in no way inferior to the expansion due to the thermal expansion of the other tubes 13b other than this, and the temperature difference at the outermost tube 13a is evenly smoothed. The tensile stress that tends to concentrate on the tube 13a can be prevented more reliably. Moreover, the temperature drop of the outermost tube 13a can be easily suppressed simply by providing the water guide plates 44 and 45 in the upper tank 11 and the lower tank 12, and this is very advantageous for implementation. Become.

  In the second embodiment, the water guide plates 44 and 45 are provided in the upper tank 11 and the lower tank 12, respectively, but the water guide plates may be provided only in at least one of the upper tank and the lower tank. .

  Moreover, in the said Example 2, the water guide plates 44 and 45 in the upper tank 11 and the lower tank 12 are used independently, a cooling water is actively introduce | transduced with respect to the outermost end tube 13a, and the outermost end tube Although the temperature drop of 13a is suppressed, in addition to the configuration of the cooling air volume adjusting means of the first embodiment, a water guide plate may be provided in each tank. In that case, by means of a water guide plate that actively introduces cooling water into the outermost tube, and a cooling airflow adjustment means that reduces the amount of cooling air that passes between each side plate and the outermost tube. Therefore, the temperature drop of the outermost tube is effectively suppressed, and the temperature difference between each tube is almost equalized. Without this, it is possible to more effectively prevent the tensile stress that tends to concentrate on the outermost tube through the core plate that moves outward.

  Next, a third embodiment of the present invention will be described with reference to FIGS.

  In the third embodiment, the configuration of the core plate is changed in place of the cooling air volume adjusting means. The rest of the configuration excluding the cooling air volume adjusting means and the core plate is the same as that of the first embodiment, and the same parts are denoted by the same reference numerals and detailed description thereof is omitted.

  That is, in this embodiment, as shown in FIG. 6, the upper and lower core plates 51 are in the vicinity of the fixing portion of the core plate 51 that fixes the outermost tube 13 a adjacent to the left and right side plates 15, that is, in the vicinity of both left and right ends. Is configured to be lower than the rigidity in the vicinity of the fixing portion of the core plate 51 to which the other tube 13b is fixed, that is, in the vicinity of the central portion excluding the left and right ends.

  Each of the core plates 51 has a ventilation direction width in the vicinity of both left and right ends of the core plate 51 located in the vicinity of the outermost tube 13a, and the inner tube 13b than the second tube 13b adjacent to the outermost tube 13a. It is formed so as to be wider than the width in the ventilation direction near the center of the core plate 51 located in the vicinity. In this case, the portions on the outer side of the center of each core plate 51 located near the second tube 13b adjacent to the outermost tube 13a are the left and right ends of the core plate 51 located near the outermost tube 13a. It is formed in a taper shape so that the ventilation direction width near the center converges to the ventilation direction width near the center of the core plate 51 located inside the second tube 13b adjacent to the outermost tube 13a. .

  Accordingly, in the third embodiment, the core located near the left and right ends of the core plate 51 to which the outermost tube 13a is fixed is positioned on the inner side of the second tube 13b adjacent to the outermost tube 13a. Since the ventilation direction width of the core plate 51 is changed so as to be lower than the rigidity in the vicinity of the central portion of the plate 51, the temperature of the cooling water passes through the fins 16 on the left and right side plates 15 cooled by the cooling air. Even if the tube 13a at the outermost end does not expand due to thermal expansion like the other tube 13b due to the temperature difference with the other tube 13b because it is transmitted and cooled excessively, as shown in FIG. When the other tubes 13b excluding the outermost tube 13a are expanded by thermal expansion, the present invention has a low rigidity portion that has a wide ventilation direction width and is easily bent. The tensile stress acting on each side plate 15 and the outermost tube 13a is smoothly absorbed by the vicinity of both left and right ends of the core plate 51, and the tensile stress acting on the left and right side plates 15 and the outermost tube 13a is absorbed. It is very small compared to the conventional one. Thereby, the tensile stress concentrated on the outermost tube 13a via the core plate 51 can be reliably prevented while ensuring the rigidity of the radiator 1 itself.

  Next, a fourth embodiment of the present invention will be described with reference to FIG.

  In the fourth embodiment, the configuration of the core plate is changed. The other configurations except for the core plate are the same as those in the third embodiment, and the same portions are denoted by the same reference numerals and detailed description thereof is omitted.

  That is, in this embodiment, as shown in FIG. 8, the upper and lower core plates 52 are fixed portions of the core plate 52 to which the other tubes b except the outermost tubes 13a adjacent to the left and right side plates 15 are fixed. The rigidity in the vicinity, that is, in the vicinity of the central portion excluding the left and right ends is configured to be higher than the rigidity in the vicinity of the fixing portion of the core plate 52 to which the outermost tube 13a is fixed, that is, in the vicinity of the left and right ends.

  Each core plate 52 is a core plate in which the outermost tube 13a is located near the center of the core plate 52 located on the inner side of the second tube 13b adjacent to the outermost tube 13a. It is formed so as to be wider than the width in the ventilation direction in the vicinity of the left and right ends of 52. In this case, the portion of the core plate 52 located near the second tube 13b adjacent to the outermost tube 13a is closer to the outer side than the second tube 13b adjacent to the outermost tube 13a. The airflow direction width near the center of the core plate 52 located inside is tapered so as to converge to the airflow direction width near the left and right ends of the core plate 52 located near the outermost tube 13a. .

  Therefore, in the above-described fourth embodiment, the core plate 52 to which the rigidity in the vicinity of the center portion of the core plate 52 located inside the second tube 13b adjacent to the outermost tube 13a is fixed is the outermost tube 13a. Since the width of the airflow direction of the core plate 52 is widely changed so as to be lower than the rigidity in the vicinity of the left and right ends of the cooling water, the temperature of the cooling water is passed through the fins 16 to the left and right side plates 15 cooled by the cooling air. Since the tube 13a at the outermost end is not cooled due to thermal expansion like the other tube 13b due to the temperature difference with the other tube 13b because the tube 13a is transmitted and cooled excessively, the outermost tube 13a is When the other tubes 13b other than the above are expanded due to thermal expansion, in the present invention, the inside of the core plate 52 having a low rigidity and a wide width in the ventilation direction is easy to bend. By the vicinity of the portion, the tensile stress acting on each side plate 15 and the outermost end tube 13a is smoothly passed through the left and right end portions of the core plate 52 when the other tubes 13b excluding the outermost end tube 13a are extended. The tensile stress that is absorbed and acts on the left and right side plates 15 and the outermost tube 13a is much smaller than that of the conventional one. Thereby, the tensile stress concentrated on the outermost tube 13a via the core plate 52 can be reliably prevented while securing the rigidity of the radiator 1 itself.

  In addition, this invention is not limited to said each Example, The other various modifications are included. For example, in the third and fourth embodiments, the core plate 51 in which the width in the ventilation direction is changed so that there is a difference between the rigidity in the vicinity of the fixing portion of the outermost tube and the rigidity in the vicinity of the fixing portion of the other tube. , 52 are used individually to smoothly absorb the tensile stress acting on each side plate 15 and the outermost tube 13a, but in addition to the configuration of the cooling air volume adjusting means of the first embodiment, A core plate may be used in which there is a difference between the rigidity in the vicinity of the fixing portion of the tube at the outer end and the rigidity in the vicinity of the fixing portion of the other tube. In that case, the temperature difference between each tube is made almost uniform by suppressing the temperature drop of each side plate by the cooling air with a small amount of cooling air passing between each side plate and the outermost tube, The difference in extension between the outermost tube and the other tube is suppressed, and the suppressed extension difference is smoothly absorbed by the difference in rigidity in the vicinity of the fixing portion with respect to the core plate. It becomes possible to more effectively prevent the tensile stress that tends to concentrate on the outermost tube through the core plate that moves outward.

  Further, in Examples 3 and 4, the core plate 51 has the mutual ventilation direction width changed so that there is a difference between the rigidity in the vicinity of the fixing part of the outermost tube and the rigidity in the vicinity of the fixing part of the other tube. 52 in addition to the water guide plates 44 and 45 in the upper tank 11 and the lower tank 12 in the second embodiment, the rigidity in the vicinity of the fixing portion of the outermost tube and the other tube A core plate having a difference in rigidity in the vicinity of the fixing portion may be used. In that case, the cooling water is positively introduced into the outermost tube by the water guide plate, and the temperature difference between the tubes is made almost uniform by suppressing the temperature drop of the outermost tube. In addition to suppressing the difference in extension between the tubes, the suppressed extension difference is smoothly absorbed by the difference in rigidity in the vicinity of the fixing portion with respect to the core plate. Thus, it is possible to more effectively prevent the tensile stress that tends to concentrate on the outermost tube.

  In each of the above-described embodiments, the case where the side flow type radiator 1 is used has been described. However, a pair of left and right tanks extending in a substantially vertical direction at both left and right ends of the radiator, and a horizontal direction between the tanks. A plurality of tubes that are connected to each other so that cooling water can flow between the tanks, and the cooling water flowing through the tubes between the left and right tanks is cooled by cooling air, so-called Of course, a cross-flow type radiator may be applied.

  Furthermore, the present invention is not limited to the case where each of the above-described embodiments is used individually by each configuration, and is used by a configuration combining any of the configurations of Embodiments 1 to 4. Of course it may be.

It is the front view which looked at the radiator concerning Example 1 of this invention from the vehicle body front. It is sectional drawing of the radiator similarly cut | disconnected in fin vicinity of the outermost end. It is sectional drawing of the radiator similarly cut | disconnected in the other fin vicinity inside the fin of the outermost end. It is a characteristic view which similarly shows the temperature characteristic of the side plate, the outermost end tube, and the second and third tubes from the outermost end. It is the front view which looked at the radiator concerning Example 2 of this invention from the vehicle body front. It is the top view which looked at the outer end vicinity of the core plate of the radiator concerning Example 3 of this invention from the vehicle body upper direction. It is a characteristic view which similarly shows the stress characteristic which acts on the side plate, the outermost end tube, and the second and third tubes from the outermost end. It is the top view which looked at the outer end vicinity of the core plate of the radiator concerning Example 4 of this invention from the vehicle body upper direction.

Explanation of symbols

1 Radiator (Automotive heat exchanger)
11 Upper tank
12 Lower tank
13a Outermost tube 13b Other tubes 14, 51, 52 inside the outermost tube
Core plate 15 Side plate (connection plate)
16 Fin 2 Cooling air volume adjusting means 44, 45

Claims (6)

The tanks facing each other are connected by a plurality of tubes so that the cooling water can be circulated, and the plurality of tubes are fixed to both the tanks via the core plate, and the longitudinal direction of the core plate In the automotive heat exchanger that is connected between both ends by a connecting plate,
Cooling air volume adjusting means for adjusting the cooling air volume passing between the connecting plate and the outermost tube adjacent to the connecting plate to be smaller than the cooling air volume passing between the tubes is provided. A heat exchanger for automobiles. The tanks facing each other are connected by a plurality of tubes so that the cooling water can be circulated, and the plurality of tubes are fixed to both the tanks via the core plate, and the longitudinal direction of the core plate In the automotive heat exchanger that is connected between both ends by a connecting plate,
The core plate is configured so that there is a difference between the rigidity in the vicinity of the fixing portion for fixing the outermost tube adjacent to the connecting plate and the rigidity in the vicinity of the fixing portion for fixing other tubes. A featured heat exchanger for automobiles. The automotive heat exchanger according to claim 1,
The core plate is configured such that there is a difference between the rigidity in the vicinity of the fixing part where the outermost tube adjacent to the connecting plate is fixed and the rigidity in the vicinity of the fixing part where the other tube is fixed. A heat exchanger for automobiles. In the automotive heat exchanger according to claim 2 or 3,
The core plate is configured so that a ventilation direction width of a portion located in the vicinity of the outermost tube is wider or narrower than a ventilation direction width of a portion located in the vicinity of the other tube. Heat exchanger. The tanks facing each other are connected by a plurality of tubes so that the cooling water can be circulated, and the plurality of tubes are fixed to both the tanks via the core plate, and the longitudinal direction of the core plate In the automotive heat exchanger that is connected between both ends by a connecting plate,
In at least one of the two tanks, the outermost tube is disposed so that the flow rate of the cooling water flowing in the outermost tube is larger than the flow rate of the cooling water flowing in the other tubes. A heat exchanger for an automobile, characterized in that a water guide plate that actively guides cooling water is provided. In the automotive heat exchanger according to claim 1 or 2,
In at least one of the two tanks, the outermost tube is cooled so that the flow rate of cooling water flowing in the outermost tube is larger than the flow rate of cooling water flowing in the other tubes. A heat exchanger for an automobile, characterized in that a water guide plate that actively guides water is provided.

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