JP4613832B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchanger such as a radiator.

  Conventionally, a plurality of tubes arranged in parallel, fins arranged between adjacent tubes, and header tanks arranged at both ends in the longitudinal direction of the tubes and communicating with the tubes, are flown through the tubes. There is a heat exchanger that performs heat exchange between one fluid and a second fluid that flows between tubes.

  In the heat exchanger having such a configuration, the first fluid is led out to the header tank on the surface on the outlet side of the second fluid to the header tank or the introduction pipe for guiding the first fluid into the header tank. The outlet piping is in communication.

In addition, the height from the end of the header tank to which the tube is connected to the end located on the opposite side in the longitudinal direction of the tube is larger than the pipe diameter of the inlet pipe and outlet pipe, and the second fluid It is the same on the inlet side and the outlet side, and the ventilation area on the second fluid inlet side of the core part composed of the tube and the fin is the same as the ventilation area on the second fluid outlet side (for example, Patent Document 1). reference).
Japanese Patent Laying-Open No. 2005-127676 (FIGS. 1 and 2)

  In the heat exchanger having the above-described structure, if the entire heat exchanger is enlarged, the amount of the second fluid flowing into the core portion can be increased, and the heat exchange performance between the first fluid and the second fluid can be improved. it can.

  However, when the size of the place where the heat exchanger is installed is limited, it is impossible to increase the overall size of the heat exchanger than the installation place, and thus the heat exchange performance cannot be improved. .

  In view of the above points, the present invention provides a heat exchanger having a novel structure capable of enhancing the heat exchange performance as compared with a conventional heat exchanger having the same overall heat exchanger size. With the goal.

  In order to achieve the above object, according to the present invention, at least one of the first and second header tanks (5, 6) is provided from an end (17) on the side connected to the tube on the second fluid outlet side surface. The first height (18) to the end (11) located on the opposite side in the longitudinal direction of the tube is equal to or larger than the diameter (14) of the pipe (5a, 6a), and the core On the side connected to the tube on the inlet side surface of the second fluid so that the area of the inlet side of the second fluid of the portion (4) is larger than the area of the outlet side of the second fluid of the core portion (4). The second height (19) from the end (16) to the end (11) located on the opposite side in the longitudinal direction of the tube has a shape lower than the first height (18). It is said.

  In the present invention, by making the second height lower than the first height, the area on the inlet side of the second fluid in the core part is made larger than the area on the outlet side of the second fluid in the core part. Thereby, compared with the conventional heat exchanger whose 1st height is the same as this invention and 2nd height is the same as 1st height, the 2nd fluid quantity which flows through a core part is reduced. The heat exchange performance can be enhanced.

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

(First embodiment)
This embodiment demonstrates the case where the heat exchanger which concerns on this invention is applied to the radiator which heat-exchanges the engine cooling water which cooled the vehicle engine, and air | atmosphere (air). 1 and 2 show a front view and a rear view of the radiator 1, respectively. FIG. 1 shows the air outlet side of the radiator 1, and FIG. 2 shows the air inlet side of the radiator 1.

  As shown in FIGS. 1 and 2, the radiator 1 is a fin tube type heat exchanger, and includes a plurality of tubes 2, fins 3 disposed between adjacent tubes 2, and the longitudinal direction of the tubes 2. Header tanks 5 and 6 are provided on both ends. 1 and 2, the vertical direction in the drawings is the longitudinal direction of the tube 2.

  The tube 2 is a tube through which engine coolant as the first fluid flows. The tube 2 is flat so that the flow direction of air as the second fluid (the direction perpendicular to the paper surface) coincides with the major axis direction. A plurality of them are arranged in parallel so that the longitudinal direction thereof coincides with the vertical direction.

  The fin 3 increases the heat transfer area with the air flowing outside the tube 2 to promote heat exchange between the engine coolant and the air, and is joined to the outer surface of the tube 2. In the present embodiment, corrugated fins that are formed in a wave shape are used as the fins 3. In the following, the substantially rectangular heat exchange part composed of the tube 2 and the fin 3 is referred to as a core part 4.

  The upper header tank 5 in the figure distributes the high-temperature engine coolant that has flowed out of the engine to each tube 2, and the lower header tank 6 in the figure is the engine coolant that has been cooled by the core 4. Is recovered from each tube 2 and returned to the engine.

  The upper and lower header tanks 5, 6 in the figure have a shape extending in the direction orthogonal to the longitudinal direction of the tube 2 at the longitudinal end of the tube 2, that is, in the horizontal direction, Communicate. The upper and lower header tanks 5 and 6 in the figure, as shown in FIG. 1, are respectively provided on the outlet side of the air flowing through the core part 4, that is, on the downstream side of the air flow, It communicates with the outlet pipe 6a. The introduction pipe 5a is connected to the engine cooling water outflow side of the engine, and the engine cooling water flowing out from the engine is introduced into the upper header tank 5 in the drawing by the introduction pipe 5a. On the other hand, the outlet pipe 6a is connected to the engine cooling water inflow side of the engine, and the engine cooling water flowing through the tube 2 is led out from the lower header tank 6 by the outlet pipe 6a.

  Here, the structure of the header tank 5 on the upper side in the drawing will be described in more detail. FIG. 3 is a sectional view taken along line AA in FIG.

  As shown in FIGS. 1 to 3, the upper header tank 5 includes a core plate 5 b to which the tube 2 is inserted and joined, and a tank body 5 c that forms a tank internal space together with the core plate 5 b.

  In the present embodiment, the tank body 5c is integrated with the introduction pipe 5a and is made of resin together with the introduction pipe 5a. The tank body 5c has a substantially U-shaped cross section, and the height 13 in the longitudinal direction of the tube 2 from the upper end surface 11 on the air outlet side of the core portion 4 to the end portion 12a fixed to the core plate 5b. However, the height 15 from the upper end surface 11 of the core portion 4 on the air inlet side to the end portion 12b fixed to the core plate 5b is larger than the height 13 on the air outlet side. Low shape.

  The core plate 5b is made of a metal such as an aluminum alloy, and the end portions 12a and 12b of the tank body 5c are inserted into the end portions 16 and 17 having a substantially U-shaped cross section. Caulking is fixed. When the core plate 5b is fixed to the tank body 5c, the end 16 on the air inlet side of the core plate 5b is located higher than the end 17 on the air outlet, and is indicated by a broken line in the figure. As shown, the surface on the side where the tube 2 is inserted is not horizontal but is in an inclined state. Moreover, the tip of the tube 2 is not horizontal but is slanted, and has a shape parallel to the surface of the core plate 5b where the tube 2 is inserted.

  In the present embodiment, packing made of an elastic material such as rubber (not shown) is disposed on the end portions 16 and 17 having a substantially U-shaped cross section of the core plate 5b, and between the core plate 5b and the tank body 5c. By interposing packing, the gap between the core plate 5b and the tank body 5c is sealed.

  For this reason, in this embodiment, the upper header tank 5 is connected to the tube 2 located at the lowest position on the air outlet side of the core portion 4 from the upper end surface 11 located at the highest position in the header tank 5. The first height 18 to the end 17 on the side is larger than the diameter 14 of the introduction pipe 5a, and is connected to the tube 2 at the lowest position on the air inlet side of the core 4 from the upper end surface 11. The second height 19 up to the end 16 on the second side is lower than the first height 18. The upper end surface 11 is located on the opposite side of the tube in the longitudinal direction with respect to the end portions 16 and 17 on the side connected to the tube. Thus, in this embodiment, in the upper header tank 5, the positions of the end portions 16 and 17 on the side connected to the tube 2 are different between the air inlet side and the outlet side.

  As shown in FIGS. 1 and 2, the lower header tank 6 is also configured to have a core plate 6b and a tank body 6c. The lower header tank 6 is obtained by reversing the upper header tank 5 in the vertical direction, and has the same shape as the upper header tank 5. In the lower header tank 6, the upper end surface 11 in FIG. 3 corresponds to the lower end surface.

  Therefore, in this embodiment, as can be seen by comparing FIG. 1 and FIG. 2, the core portion 4 has a longitudinal direction of the tube 2 on the air inlet side, that is, a length 20 in the vertical direction in the figure. The length is longer than the length 21 in the vertical direction in the drawing, and the air inlet side has a larger ventilation area (area in a plane perpendicular to the air flow) than the air outlet side.

  As shown in FIGS. 1 and 2, the upper and lower header tanks 5 and 6 are provided with protrusions 7 for assembling the radiator 1 to the vehicle body side, that is, the carrier (radiator support or front end panel). It has been. The upper header tank 5 is provided with a pressurized radiator cap 8, and the lower header tank 6 is provided with a plug 9 for closing a drain port for draining engine cooling water from the radiator 1. It has been.

  As shown in FIGS. 1 and 2, an insert 10 that extends substantially parallel to the longitudinal direction of the tube 2 and reinforces the core portion 4 is provided at the end of the core portion 4.

  In this embodiment, the metal parts such as the tube 2, the fin 3, the core plate 5b, and the insert 10 are all joined by brazing. Moreover, the radiator 1 of this embodiment can be manufactured by changing the shape of the tank main bodies 5c and 6b and the like with respect to the conventional method of manufacturing a radiator.

  Next, main effects of this embodiment will be described.

  (1) As described above, in the present embodiment, the upper header tank 5 is arranged on the air inlet side so that the ventilation area on the air inlet side of the core portion 4 is larger than the ventilation area on the air outlet side. The second height 19 from the upper end surface 11 to the end 16 on the side connected to the tube 2 is the first height 19 from the upper end surface 11 on the air outlet side to the end 17 on the side connected to the tube 2. Similarly, the lower header tank 6 has a shape lower than the height 18, and the second height from the lower end surface on the air inlet side to the end connected to the tube is the air outlet. The shape is lower than the first height from the lower end surface on the side to the end on the side connected to the tube.

  Thereby, the first height on the air outlet side and the second height on the air inlet side are the same, and these are the same as the first height 18 of the present embodiment. In comparison, since the amount of air flowing through the core portion 4 can be increased, the heat exchange performance of the radiator 1 can be enhanced.

  (2) Furthermore, the radiator 1 of the present embodiment has the effects described below.

  4 and 5 show a state in which the radiator according to the related art and the present embodiment is mounted on a vehicle, respectively. The radiator shown in FIG. 4 is different from the radiator 1 of the present embodiment in the shape of the header tank, and the height 34 from the upper end surface 32a of the upper header tank 32 to the end portion 32b on the side connected to the tube 33 is shown. However, it is the same on the air inlet side and the air outlet side, and is larger than the diameter 35 a of the introduction pipe 35. The portion where the tube 33 is located is the core portion 36.

  In a vehicle equipped with an air conditioner, as shown in FIG. 4, the radiator 31 is mounted behind the condenser 41 (downstream side of the air flow). At this time, the capacitor 41 has the same structure as the radiator 31, but is arranged so that the radiator is rotated by 90 °, the U-shaped insert 42 is positioned up and down, and the longitudinal direction of a tube (not shown) is left and right It matches the direction. In addition, the part below the insert in the figure is the core part 43.

  At this time, the upper ends of the capacitor 41 and the radiator 31 may be aligned as shown in FIG. In this case, if the diameter 35a of the introduction pipe 35 communicating with the header tank 32 of the radiator 31 is larger than the width of the insert 42 of the capacitor 41, the header tank 31 becomes larger than the insert 42. The upper end of the portion 36 is at a position lower than the upper end of the core portion 43 of the capacitor 41, and the header tank 32 of the radiator 31 provides air flow resistance. For this reason, on the upper end side of the capacitor 41 and the radiator 31, air flows avoiding the header tank 32 and air does not flow into the upper portion of the core portion 43 of the capacitor 41, so that the heat dissipation performance of the capacitor 41 can be effectively utilized. There wasn't.

  On the other hand, as shown in FIG. 5, in the case where the radiator 1 of the present embodiment is mounted behind the capacitor 41, even if the upper ends of the capacitor 41 and the radiator 1 are aligned, the header tank 5 is As described above, the height 19 on the air inlet side is lowered so that the ventilation area on the air inlet side is larger than the ventilation area on the air outlet side, while the height 18 at which the air outlet side can communicate with the introduction pipe 5a is set. Therefore, the flow of air flowing through the core portion 43 of the capacitor 41 and the core portion 4 of the radiator 1 can be improved as compared with the conventional radiator 31 shown in FIG.

  From the viewpoint of utilizing all the heat radiation performance of the capacitor 41, the height of the header tank 5 on the air inlet side is such that the air that has passed through the entire core portion 43 of the capacitor 41 flows through the core portion 4 of the radiator 1. It is preferable to set 19. For example, the height 19 on the air inlet side is set so that the position of the upper end of the core portion 4 on the air inlet side of the radiator 1 coincides with or is in the vicinity of the position of the upper end of the core portion 43 of the condenser 41. Set.

  4 and 5, the case where the upper ends of the radiator and the capacitor are aligned has been described as an example, but the same can be said when the lower ends are aligned. Further, in the present embodiment, the case where the radiator 1 is arranged so that the vertical direction in FIG. 1 matches the vertical direction is described as an example, but the vertical direction and vertical direction in FIG. The same applies to the case where the radiator 1 is arranged.

(Second Embodiment)
In the first embodiment, the case where the tank body 5c of the header tank 5 is made of resin has been described as an example. However, in the present embodiment, the case where the tank body 5c of the header tank 5 is made of metal such as aluminum will be described. . FIG. 6 shows a cross-sectional view of the header tank in the present embodiment. FIG. 6 corresponds to FIG.

  As shown in FIG. 6, the upper header tank 5 has a configuration in which an L-shaped core plate 5b and a tank body 5c are joined by brazing. The core plate 5b has an obtuse angle formed by the air inlet side surface 22 of the header tank 5 and the surface 23 on which the tube 2 is inserted. Similarly to the header tank 5 shown in FIG. The surface 23 on the side where the is inserted is not horizontal but oblique. Further, the tank body 5c and the introduction pipe 5a are configured as separate parts, and the introduction pipe 5a is fixed in a state of being inserted into an opening provided on the surface 24 on the air outlet side of the tank body 5c. .

  Also in this embodiment, the upper header tank 5 is connected to the tube 2 located at the lowest position on the air outlet side of the core portion 4 from the upper end surface 11 located at the highest position in the header tank 5. The first height 18 to the end 17 on the side is larger than the diameter 14 of the introduction pipe 5a, and is connected to the tube 2 at the lowest position on the air inlet side of the core 4 from the upper end surface 11. The second height 19 up to the end 16 on the second side is lower than the first height 18.

  Also, the lower header tank 6 has the same structure as the upper header tank 5, and the core plate 6b, the tank body 6c, and the outlet pipe 6a constituting the lower header tank 6 are respectively provided in the upper header tank 6. 5 corresponds to the core plate 5b, the tank body 5c, and the introduction pipe 5a.

  Thereby, also in this embodiment, it has the same effect as a 1st embodiment.

(Other embodiments)
In each of the above-described embodiments, for example, in the upper header tank 5, the upper end surface 11 located at the highest position in the header tank 5 is connected to the tube 2 located at the lowest position on the air outlet side of the core portion 4. In the above description, the first height 18 to the end portion 17 on the other side is larger than the diameter 14 of the introduction pipe 5a as an example, but it is only necessary that the header tank 5 and the introduction pipe 5a can communicate with each other. The first height 18 may be the same size as the diameter 14 of the introduction pipe 5a.

  In the first embodiment, the case where the present invention is applied to both the upper and lower header tanks 5 and 6 has been described as an example. However, if the present invention is applied to at least one of the tanks, the effect is obtained. Although there is a difference, the same effect as the effect (1) described in the first embodiment is obtained.

  In the first embodiment, in the effect (2), the case where the condenser and the radiator are arranged in parallel has been described as an example. However, the present invention is not limited to the condenser and the radiator, and other types of heat exchangers are arranged in parallel. The same effect can be obtained by applying the present invention to the heat exchanger arranged on the rear side. In this case, another heat medium (first fluid, second fluid) is used instead of engine coolant and air.

It is a front view by the side of the air outlet of the heat exchanger in a 1st embodiment of the present invention. It is a front view in the air inlet side of the heat exchanger in 1st Embodiment of this invention. It is the sectional view on the AA line in FIG. It is a side view which shows the state by which the conventional radiator is mounted in the vehicle. It is a side view showing the state where the radiator of a 1st embodiment is carried in vehicles. It is sectional drawing of the header tank in 2nd Embodiment of this invention.

Explanation of symbols

1 ... Radiator, 2 ... Tube, 3 ... Fin, 4 ... Core part,
5 ... Upper header tank, 6 ... Lower header tank.

Claims (2)

A tube (2) through which the first fluid flows;
A fin (3) joined to the outer surface of the tube (2) and facilitating heat exchange between the second fluid flowing outside the tube and the first fluid;
First and second header tanks (5, 6) disposed on both ends in the longitudinal direction of the tube (2) and communicating with the tube (2),
The first and second header tanks (5, 6) are provided on the outlet side surface of the second fluid flowing through the core (4) constituted by the tube (2) and the fin (3). Is connected to the pipe (5a, 6a) through which
At least one of the first and second header tanks (5, 6) is on the opposite side in the longitudinal direction of the tube from the end (17) on the side connected to the tube on the outlet side surface of the second fluid. The first height (18) to the end portion (11) located at the same length as the diameter (14) of the pipe (5a, 6a) or larger than that, and the core portion (4) The end portion on the side connected to the tube on the inlet side surface of the second fluid so that the inlet side area of the second fluid is larger than the outlet side area of the second fluid of the core portion (4). The second height (19) from 16) to the end (11) located on the opposite side in the longitudinal direction of the tube has a shape lower than the first height (18). Heat exchanger. Of the plurality of heat exchangers (41, 1), the second fluid flows through the cores (43, 4) that perform heat exchange between the fluids, and are arranged in parallel on the upstream side and the downstream side of the second fluid flow. The heat exchanger (1) according to claim 1, which is arranged on the downstream side of
In the first and second header tanks (5, 6), the second fluid that has passed through the entire area of the core (43) of the heat exchanger (41) disposed on the upstream side is disposed on the downstream side. The heat exchanger is characterized in that the second height (19) is set so as to flow into the core part (4) of the heat exchanger (1) to be operated.

Images