JP2018105509A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformize a fluid flow rate of each tube without increasing fluid resistance.SOLUTION: An inlet fluid passage 25 of an inlet tank 2 is divided into a first inlet space 251 and a second inlet space 252 by a partition plate part 61 of a straightening plate 6. By a guide plate part 62 of the straightening plate 6, a space between the second inlet space 252 and an inlet port 241 is blocked, and a fluid which has flowed in from the inlet port 241 is guided to the first inlet space 251. The fluid which has flowed in the first inlet space 251 flows to the second inlet space 252 via a communication port provided at the guide plate part 62. As the inlet fluid passage 25 is divided into two, a flow speed in the first inlet space 251 becomes higher, and hot water is more likely to reach a portion being separated from the inlet port 241 in the first inlet space 251. As a result, hot water is surely supplied even to a tube 11 at a position being separated from the inlet port 241, and a flow rate of the hot water flowing in each tube 11 from the first inlet space 251 is uniformized.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a heat exchanger that performs heat exchange between a first fluid that flows inside stacked tubes and a second fluid that flows between adjacent tubes.

  Conventionally, as this type of heat exchanger, an inlet tank that distributes the first fluid to the tube is joined to one end side in the tube longitudinal direction of the tube, and an outlet tank that collects the first fluid flowing out from the tube is used as the tube. What was joined to the tube longitudinal direction other end side is known.

  In the heat exchanger having such a configuration, the inlet fluid passage in the inlet tank extends in the tube stacking direction, and the pressure loss increases in the inlet fluid passage. For this reason, the flow rate of the first fluid flowing into the tube at a position away from the inlet of the inlet tank among the multiple tubes is larger than the flow rate of the first fluid flowing into the tube at a position near the inlet of the inlet tank. As a result, the fluid flow rate of each tube becomes non-uniform.

  Therefore, in the heat exchanger described in Patent Document 1, the fluid flow rate of the tube near the inlet of the inlet tank is closed by closing a part of the opening on the one end side of the tube near the inlet of the inlet tank. In order to make the fluid flow rate of each tube uniform.

Japanese Patent No. 4830918

  However, the conventional heat exchanger has a problem that the fluid resistance increases because a part of the opening on the one end side of the tube is blocked. In addition, when the flow direction of the first fluid when flowing into the inlet fluid passage is not orthogonal to the second fluid flow direction, the first fluid in the upstream portion in the second fluid flow direction in the in-tube flow path. There is a problem that a difference in flow rate occurs between the flow rate of the first fluid and the flow rate of the first fluid in the downstream portion in the second fluid flow direction.

  In view of the above points, the first object of the present invention is to equalize the fluid flow rate of each tube without increasing the fluid resistance. Further, the second difference is to reduce the flow rate difference between the flow rate of the first fluid in the upstream portion in the second fluid flow direction and the flow rate of the first fluid in the downstream portion in the second fluid flow direction in the flow path in the tube. Objective.

  In order to achieve the above object, in the invention according to claim 1, a plurality of tubes (11) through which the first fluid flows are stacked and a heat exchange core portion through which the second fluid flows between adjacent tubes. (1) and an inlet fluid passage (25) through which the first fluid flows are formed inside and joined so that one end side in the tube longitudinal direction (A) of the tube communicates with the inlet fluid passage. An inlet tank (2) that distributes to the tube, an outlet tank (3) that collects the first fluid flowing out from the tube, joined at the other end side of the tube in the tube longitudinal direction, and a rectifying plate that partitions the inside of the inlet fluid passage (6), an inlet (241) for allowing the first fluid to flow in is disposed at one end of the inlet tank in the tube stacking direction (B), and the rectifying plate flows through the inlet fluid passage through the second fluid. A communication port (63) is formed which bisects the first inlet space (251) and the second inlet space (252) along the direction, and partially communicates the first inlet space and the second inlet space. A partition plate part (61) is provided, which guides the first fluid flowing in from the inflow port to the first inlet space and flows into the second inlet space through the communication port.

  According to this, by dividing the inlet fluid passage into the first inlet space and the second inlet space, the flow velocity in the first inlet space is increased, and the tube located at a position away from the inlet of the inlet tank is also the first. Since the fluid flows reliably, the flow rate of the first fluid flowing into each tube from the first inlet space can be made uniform.

  In addition, by appropriately setting the opening area for each communication port, the pitch between adjacent communication ports, and the position of the partition plate portion in the second fluid flow direction, the entire flow rate of the first fluid flowing into the second inlet space is set. And the flow rate of the first fluid flowing into each part of the second inlet space can be made substantially equal. Thereby, the flow volume of the 1st fluid which flows in into each tube from 2nd inlet space can be equalize | homogenized. Further, for each tube, the flow rate difference between the flow rate of the first fluid in the upstream portion in the second fluid flow direction and the flow rate of the first fluid in the downstream portion in the second fluid flow direction in the tube flow path is reduced. be able to. As a result, the heat exchange performance is improved.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is a perspective view of the heat exchanger which concerns on 1st Embodiment. It is front sectional drawing of the principal part of the heat exchanger which concerns on 1st Embodiment. FIG. 3 is a left side view of FIG. 2. It is IV-IV sectional drawing of FIG. It is VV sectional drawing of FIG. It is a front view of the baffle plate in the heat exchanger which concerns on 1st Embodiment. FIG. 7 is a left side view of FIG. 6. FIG. 7 is a bottom view of FIG. 6. It is front sectional drawing of the principal part which shows the modification of the heat exchanger which concerns on 1st Embodiment. It is the figure shown in the same format as FIG. 5 about the heat exchanger which concerns on 2nd Embodiment. It is XI-XI sectional drawing of FIG. It is an expanded view before the bending process of the inlet tank in the heat exchanger which concerns on 2nd Embodiment. It is sectional drawing which shows the bending process process of the inlet tank in the heat exchanger which concerns on 2nd Embodiment. It shows the bending process of the inlet tank in the heat exchanger which concerns on 2nd Embodiment, and is the side view seen from the connection pipe 24 side. It is a front view of the baffle plate in the heat exchanger which concerns on 3rd Embodiment. FIG. 16 is a left side view of FIG. 15. FIG. 16 is a plan view of FIG. 15. It is sectional drawing of the principal part of the heat exchanger which concerns on 3rd Embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. Note that, in each of the following embodiments, parts that are the same as or equivalent to the matters described in the preceding embodiment are denoted by the same reference numerals, and the description thereof may be omitted. Moreover, in each embodiment, when only a part of the component is described, the component described in the preceding embodiment can be applied to the other part of the component.

(First embodiment)
A first embodiment of the present invention will be described. In the present embodiment, the present invention is applied to a heating heat exchanger (that is, a heater core) of a vehicle air conditioner. This heat exchanger uses engine cooling water (hereinafter referred to as hot water) as a first fluid. As a heat source, air (that is, conditioned air) as the second fluid is heated.

  As shown in FIGS. 1 to 5, the heat exchanger has tubes 11 and fins 12 and distributes hot water to a rectangular parallelepiped heat exchange core portion 1 that performs heat exchange between warm water and air, and a large number of tubes 11. A box-shaped inlet tank 2 and a box-shaped outlet tank 3 for collecting hot water from a large number of tubes 11 are provided.

  The tube 11 has a flow path through which hot water flows. The tube 11 has a flat shape, and one end side in the tube longitudinal direction A is joined to the inlet tank 2, and the other end side in the tube longitudinal direction A is joined to the outlet tank 3. A large number of tubes 11 are stacked between the inlet tank 2 and the outlet tank 3, and air flows between adjacent tubes 11.

  And heat exchange is performed between the hot water flowing through the tube 11 and the air flowing between the adjacent tubes 11. Fins 12 that promote heat exchange between hot water and air are arranged between adjacent tubes 11. Note that the tube longitudinal direction A, the tube stacking direction B, and the second fluid flow direction C are orthogonal to each other.

  The inlet tank 2 is disposed below the heat exchange core unit 1. The inlet tank 2 has a core plate 21 in which a tube insertion hole 211 into which a tube longitudinal end of the tube 11 is inserted is formed, and a tank main body portion 22 that is joined to the core plate 21 and constitutes a tank internal space. Yes. The core plate 21 and the tank main body 22 are both substantially U-shaped (or substantially U-shaped) in cross section, and the core plate 21 and the tank main body 22 are joined to extend in the tube stacking direction B. It has a shape.

  The inlet tank 2 includes a cap 23 that closes one end side in the longitudinal direction of the inlet tank 2, and a connection pipe 24 that is disposed on the other end side in the longitudinal direction of the inlet tank 2. An inflow port 241 through which hot water flows is formed in the connection pipe 24.

  The core plate 21, the tank main body 22, the cap 23, the tubes 11, and the fins 12 are made of metal (in the present embodiment, made of aluminum) and are integrally joined by brazing.

  The outlet tank 3 is disposed above the heat exchange core unit 1. Similar to the inlet tank 2, the outlet tank 3 includes a core plate, a tank main body, a cap, and a connection pipe.

  An inlet side cooling water pipe 4 that guides hot water to the heat exchanger is caulked and fixed to the connection pipe 24 of the inlet tank 2. An outlet-side cooling water pipe 5 that causes the hot water after heat exchange to flow out of the heat exchanger is caulked and fixed to the connection pipe of the outlet tank 3.

  An inlet fluid passage 25 through which hot water supplied via the inlet-side cooling water pipe 4 flows is formed inside the inlet tank 2. One end side of the tube 11 in the tube longitudinal direction A communicates with the inlet fluid passage 25.

  A rectifying plate 6 (see FIGS. 6 to 8) having a partition plate portion 61 and a guide plate portion 62 is disposed inside the inlet tank 2.

  The partition plate portion 61 is a plate-like member that extends in the tube stacking direction B and the tube longitudinal direction A, and is disposed at the center portion of the inlet fluid passage 25 in the second fluid flow direction C so as to pass the inlet fluid passage 25 through the second portion. The fluid is divided into a first inlet space 251 and a second inlet space 252 along the fluid flow direction C. In the first inlet space 251 and the second inlet space 252, the space located on the upstream side in the second fluid flow direction C is the first inlet space 251, and the space located on the downstream side in the second fluid flow direction C. Is the second inlet space 252.

  The guide plate portion 62 is a plate-like member that extends from the end portion on the inlet 241 side of the partition plate portion 61 toward the downstream side in the second fluid flow direction C. The guide plate portion 62 blocks the inlet 241 and the second inlet space 252 so that hot water flowing into the inlet 241 is guided to the first inlet space 251.

  A plurality of communication ports 63 that allow the first inlet space 251 and the second inlet space 252 to partially communicate with each other are formed in the partition plate portion 61. The hot water guided to the first inlet space 251 flows into the second inlet space 252 through the communication port 63.

  The communication port 63 is a hole, and a plurality of communication ports 63 are formed along the tube stacking direction B. The plurality of communication ports 63 have different opening areas and different pitches between adjacent communication ports 63.

  A protrusion insertion hole 221 is formed in a portion of the tank body 22 that faces the core plate 21 (in other words, the bottom of the tank body 22). A plurality of protrusion insertion holes 221 are formed along the tube stacking direction B.

  On the other hand, the rectifying plate 6 is formed with a protrusion 64 that protrudes toward the bottom of the tank body 22 at a portion of the partition plate 61 that faces the bottom of the tank body 22. A plurality of protrusions 64 are formed along the tube stacking direction B.

  Then, with the protrusion 64 inserted into the protrusion insertion hole 221, the rectifying plate 6 and the inlet tank 2 are integrally joined by brazing.

  Next, the operation of the heat exchanger of this embodiment will be described.

  The hot water guided to the inlet 241 via the inlet-side cooling water pipe 4 is guided by the guide plate portion 62 and flows into the first inlet space 251, in a direction away from the inlet 241 in the first inlet space 251. It flows (that is, toward the cap 23 side).

  Here, since the inlet fluid passage 25 is divided into the first inlet space 251 and the second inlet space 252, the flow velocity in the first inlet space 251 increases, and the first inlet space 251 moves away from the inlet 241. It becomes easy for hot water to reach the part. As a result, the hot water is reliably supplied also to the tubes 11 located away from the inflow port 241, and the flow rate of the hot water flowing into the tubes 11 from the first inlet space 251 is made uniform.

  A portion of the hot water flowing through the first inlet space 251 flows into the second inlet space 252 as appropriate through the plurality of communication ports 63 before reaching the most downstream portion of the first inlet space 251. The hot water that has reached the most downstream portion of the first inlet space 251 makes a U-turn and flows into the second inlet space 252.

  Here, the entire flow rate of the hot water flowing into the second inlet space 252 can be adjusted by appropriately setting the position of the partition plate portion 61 in the second fluid flow direction C. For example, when the partition plate portion 61 is positioned further downstream in the second fluid flow direction C, the flow rate of the hot water flowing into the tubes 11 from the first inlet space 251 increases, and thus the second inlet space 252. The total flow rate of hot water flowing into the water decreases.

  Moreover, the flow volume of the whole warm water which flows into the 2nd inlet space 252 can be adjusted by setting the opening area of the communicating port 63 suitably.

  Furthermore, by appropriately setting the opening area for each communication port 63 and the pitch between the adjacent communication ports 63, the flow rate of the hot water flowing into each part of the second inlet space 252 can be made substantially equal. As a result, the flow rate of the warm water flowing into each tube 11 from the second inlet space 252 is made uniform.

  Then, the total flow rate of the hot water flowing into the second inlet space 252 can be adjusted, and the flow rate of the hot water flowing into the tubes 11 from the second inlet space 252 is made uniform. In each tube 11, the flow rate difference between the flow rate of the hot water flowing from the first inlet space 251 and the flow rate of the hot water flowing from the second inlet space 252 can be reduced.

  In other words, for each tube 11, the flow rate of the hot water in the second fluid flow direction C upstream portion (that is, the windward side) and the downstream portion in the second fluid flow direction C (that is, the leeward side) in the tube flow path. The flow rate difference with the flow rate of hot water can be reduced. As a result, the heat exchange performance is improved.

  The hot water flowing into each tube 11 exchanges heat with the air flowing between the adjacent tubes 11 to heat the air. At this time, as described above, since the flow rate of the hot water flowing into each tube 11 is made uniform, the variation in the temperature distribution of the air after heat exchange is reduced. The hot water that has passed through the tube 11 is collected in the outlet tank 3 and circulated to the engine via the outlet-side cooling water pipe 5.

  According to this embodiment, the flow rate of the warm water flowing into each tube 11 can be equalized without blocking a part of the one end side opening in the tube 11, that is, without increasing the water flow resistance.

  In this embodiment, the partition plate portion 61 is disposed at the center of the inlet fluid passage 25 in the second fluid flow direction C. However, the partition plate portion 61 is disposed in the inlet fluid passage 25 in the second fluid flow direction C. You may arrange | position in site | parts other than a center part.

  For example, when the flow direction of the warm water flowing into the first inlet space 251 is not orthogonal to the second fluid flow direction C, the partition plate portion 61 is moved in the second fluid flow direction C in the inlet fluid passage 25. Displace from the center. Thereby, the flow rate in the 1st inlet space 251 can be adjusted, and the flow volume of the warm water which flows in into each tube 11 from the 1st inlet space 251 can be equalize | homogenized.

  In the present embodiment, the guide plate portion 62 blocks the gap between the inlet 241 and the second inlet space 252, but the guide plate portion 62 completely blocks the gap between the inlet 241 and the second inlet space 252. However, most of the hot water flowing into the inflow port 241 may be guided to the first inlet space 251, and a part of the hot water flowing into the inflow port 241 may be directly guided to the second inlet space 252.

  In the present embodiment, the partition plate portion 61 is a plate-like member extending in the tube stacking direction B and the tube longitudinal direction A. However, the flow path area of the first inlet space 251 is a part close to the inlet 241. The partition plate portion 61 may be inclined with respect to the tube stacking direction B, or the partition plate portion 61 may be stepped so as to gradually decrease toward a portion far from the tube. In this case, the guide plate portion 62 may be abolished by bringing the end portion on the inlet 241 side of the partition plate portion 61 close to the tank main body portion 22.

  In the present embodiment, the communication port 63 is a hole, but the communication port 63 may be a notch as in the modification shown in FIG.

(Second Embodiment)
A second embodiment will be described with reference to FIGS. In this embodiment, the point which formed the baffle plate in the inlet tank integrally is different from 1st Embodiment. In the present embodiment, description of the same or equivalent parts as in the first embodiment will be omitted or simplified.

  As shown in FIGS. 10 and 11, in the inlet tank 2, the core plate 21, the tank main body portion 22, and the rectifying plate 6 in the first embodiment are integrally formed by bending a single metal plate material.

  A method for forming the inlet tank 2 will be described. First, as shown in FIGS. 12, 13A, and 14A, a material 100 obtained by processing a metal plate into a rectangle is prepared. In this material 100, a notch 102 is processed adjacent to a planned guide plate portion 101 that will later become the guide plate portion 62. Moreover, although not shown in figure, in the site | part used as the partition plate part 61 later, several opening equivalent to the communicating port of 1st Embodiment is formed.

  Subsequently, as shown in FIG. 13B and FIG. 14B, the vicinity of both ends of the material 100 is bent 90 ° to form the rectifying plate 6 on one end side and the end plate 26 on the other end side. A tank plate portion 27 is formed between the current plate 6 and the end plate 26.

  Subsequently, as shown in FIGS. 13C and 14C, the vicinity of both ends of the tank plate portion 27 is bent by 90 ° so that the tank plate portion 27 has a U-shaped cross section.

  Subsequently, as shown in FIG. 10 and FIG. 14D, the guide plate portion planned portion 101 of the rectifying plate 6 is bent to form the guide plate portion 62.

  Subsequently, as shown in FIGS. 13 (e) and 14 (e), the tank plate portion 27 is bent 90 ° at two locations so that the tank plate portion 27 has a cylindrical shape extending in the tube stacking direction B. The tank plate portion 27 corresponds to the core plate 21 and the tank main body portion 22 in the first embodiment.

  In the inlet tank 2 subjected to the above processing, the inlet fluid passage 25 is formed in the tank plate portion 27, and the inlet fluid passage 25 is connected to the first inlet space 251 and the first inlet space 251 in the partition plate portion 61 of the rectifying plate 6. Divided into two inlet spaces 252.

  Subsequently, the inlet tank 2 in which the current plate 6 is integrally formed in this manner is brazed to the cap 23, the tube 11, and the like. At that time, the current plate 6 and the end plate 26 are also brazed.

  According to this embodiment, the same effect as that of the first embodiment can be obtained. In addition, according to the present embodiment, the number of parts can be reduced by using three parts (that is, the core plate 21, the tank body 22, and the current plate 6 in the first embodiment) as one part.

(Third embodiment)
A third embodiment will be described with reference to FIGS. This embodiment is different from the first embodiment in that a resin rectifying plate is used. In the present embodiment, description of the same or equivalent parts as in the first embodiment will be omitted or simplified.

  As shown in FIGS. 15 to 17, the rectifying plate 6 includes a partition plate portion 61, a guide plate portion 62, and positioning leg portions 65, and is integrally formed of resin.

  On one end side of the partition plate portion 61, a guide plate portion 62 and one positioning leg portion 65 are formed. Two positioning leg portions 65 are formed on the other end side of the partition plate portion 61. These positioning legs 65 are J-shaped.

  Then, as shown in FIG. 18, when the current plate 6 is inserted into the inlet tank 2, the guide plate portion 62 and the positioning leg portion 65 come into contact with the inner peripheral surface of the inlet tank 2 to position the current plate 6. .

  According to this embodiment, the same effect as that of the first embodiment can be obtained. Moreover, according to this embodiment, since the baffle plate 6 is shape | molded with resin, the baffle plate 6 can be manufactured easily.

(Other embodiments)
In each of the above embodiments, the present invention is applied to the heater core of the vehicle air conditioner. However, the present invention is not limited to this, and the present invention is applied to a heat exchanger such as a radiator for cooling the vehicle engine and a refrigerant condenser of the vehicle air conditioner. The present invention can be applied, and furthermore, the present invention can be widely applied to various heat exchangers other than those for vehicles.

  Further, the present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope described in the claims.

  Further, the above embodiments are not irrelevant to each other, and can be combined as appropriate unless the combination is clearly impossible.

  In each of the above-described embodiments, it is needless to say that elements constituting the embodiment are not necessarily indispensable except for the case where it is clearly indicated that the element is essential and the case where the element is clearly considered essential in principle. Yes.

  Further, in each of the above embodiments, when numerical values such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment are mentioned, it is clearly limited to a specific number when clearly indicated as essential and in principle. The number is not limited to the specific number except for the case.

  Further, in each of the above embodiments, when referring to the shape, positional relationship, etc. of the component, etc., the shape, unless otherwise specified and in principle limited to a specific shape, positional relationship, etc. It is not limited to the positional relationship or the like.

DESCRIPTION OF SYMBOLS 1 Heat exchange core part 2 Inlet tank 3 Outlet tank 6 Current plate 11 Tube 25 Inlet fluid passage 61 Partition plate part 62 Guide plate part 63 Communication port 241 Inlet port 251 1st inlet space 252 2nd inlet space

Claims (9)

A plurality of tubes (11) through which the first fluid flows are stacked and a heat exchange core portion (1) through which the second fluid flows between the adjacent tubes;
An inlet fluid passage (25) through which the first fluid flows is formed inside, and one end side in the tube longitudinal direction (A) of the tube is joined so as to communicate with the inlet fluid passage, and the first fluid is joined to the tube. An inlet tank (2) that distributes to
An outlet tank (3) for collecting the first fluid flowing out from the tube, wherein the other end side of the tube in the tube longitudinal direction is joined;
A rectifying plate (6) for partitioning the inlet fluid passage,
An inlet (241) through which the first fluid flows is disposed at one end of the inlet tank in the tube stacking direction (B),
The current plate bisects the inlet fluid passage along the second fluid flow direction into a first inlet space (251) and a second inlet space (252), and the first inlet space and the second inlet space. A communication port (63) that partially communicates with the second inlet space, and guides the first fluid flowing in from the inflow port to the first inlet space and into the second inlet space through the communication port. A heat exchanger comprising a plate portion (61).   The rectifying plate includes a guide plate portion (62) that cuts off the gap between the second inlet space and the inlet and guides the first fluid flowing in from the inlet to the first inlet space. The heat exchanger according to claim 1, wherein   The heat exchanger according to claim 1 or 2, wherein the inlet tank is formed by bending a plate material and integrally forming the rectifying plate.   The said inlet tank has the said inlet fluid channel | path formed by bending the site | part in which the said baffle plate is not formed among the said board | plate materials into the cylinder shape extended in the said tube lamination direction. Heat exchanger.   The heat exchanger according to any one of claims 1 to 4, wherein the partition plate portion is arranged so as to be shifted from a center position in the second fluid flow direction in the inlet fluid passage.   6. The communication port according to claim 1, wherein a plurality of the communication ports are formed along the tube stacking direction, and the plurality of communication ports have different opening areas. Heat exchanger.   The heat according to any one of claims 1 to 6, wherein a plurality of the communication ports are formed along the tube stacking direction, and a pitch between the adjacent communication ports is different. Exchanger.   The heat exchanger according to any one of claims 1 to 7, wherein the communication port is a hole.   The heat exchanger according to any one of claims 1 to 7, wherein the communication port is a notch.

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