JPH11351787A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a warm water erosion resistance by eliminating a flow of a fluid from an inlet pipe directly to an end plate or a tube directly thereunder. SOLUTION: A baffle plate 30 is mounted at a fluid introducing part formed by partitioning a tank 4 by a partition plate 5. A plurality of louvered pieces are provided at a plate body of the plate 30, a straightening plate in which openings of the pieces become channels is provided to supply the fluid to an inlet passage 1 at the tube 3 while straightening the fluid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger, and more particularly to a baffle plate arranged in an inlet tank of a heat exchanger (a fluid introduction side in the tank) to adjust a flow rate distribution of a fluid.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 8, by using an electric resistance welded tube or a roll-formed tube, or by double-folding one long plate, or by stacking two plates. A heat exchanger formed by providing a tank 4 above a flat tube 3 formed and having a fluid inflow path 1 and a return flow path 2 and partitioning the inside of the tank 4 by a partition plate 5 is known. is there.

The tank 4 comprises a tank plate 6, an end plate 7, and a partition plate 5 having a substantially inverted U-shaped cross section.
Through the tube insertion hole 7c of the tube 7, the distal end side of the insertion flat tube 3 is attached. The tank 4 is
Tank plate receiving portion 7a of end plate 7 on a flat plate
The end plate 7 is attached to the end plate 7 by fitting the front end of the side plate 6 a of the tank 4 to the end plate 7. One end of the partition plate 5 is engaged with a concave portion 6b formed in the center of the bottom plate of the tank plate 6, and the other end is attached to the center of the front end of the flat tube 3. An inlet pipe 8 and an outlet pipe 9 are attached to the tank plate 6.

In such a configuration, the entrance pipe 8
The fluid, such as engine cooling water, which flows in from the tank, is once introduced into the fluid introduction portion 4m of the tank 4, flows through the inflow passage 1 of the flat tube 3 toward the tip of the flat tube 3, and then returns in a U-turn. The fluid flows out of the outlet pipe 9 through the fluid outlet 4n in the tank 4 via the flow path 2, and is returned to the engine side.

However, according to such a configuration,
A large amount of fluid derived from the inlet pipe 8 will be supplied to the flat tube 3 corresponding to the inlet pipe 8, but little fluid will flow into the inflow path 1 of the flat tube 3 far away from the inlet pipe 8. Is not supplied, which causes a decrease in heat exchange efficiency.

Therefore, as shown in FIG. 9 and FIG.
No. 154,995. This is because a plurality of holes 11 are provided in the longitudinal direction of a baffle plate 10 provided to prevent the flow of the fluid introduced from the inlet pipe 8, and the diameter of the holes 11 is adjusted to the diameter of the inlet pipe 8.
It gradually increases as the distance from the camera increases. In this case, a bent piece 10b is formed at the end of the rising piece 10a on the side of the baffle plate 10, and an O-ring is provided between the bent piece 10b and the outer bent piece 6c provided at the tip of the tank plate 6. 12 and O
It is attached so that the bent piece 10b is pressed by the tank plate receiving portion 7a of the end plate 7 via the ring 13.

[0007]

Conventionally, however, the flow rate of the fluid at the inlet 4m side of the tank 4 can be made uniform to some extent by the hole 11, but the flow direction of the fluid flowing from the inlet pipe and the hole Are in the same direction, the fluid may directly collide with or flow into the end plate and the flat tube 3.
In particular, in a diesel engine, there is a problem that the casting sand flows out of the cast iron engine block into the cooling water, that the cooling water is contaminated due to the mixing of blow-by gas, that the casting sand is agglomerated, and that foreign matter such as engine cutting chips is mixed. When water directly collides with or flows into the end plate and the flat tube, a problem of hot water erosion in which the inside is mechanically cut off occurs.

As shown in FIG. 9, an outer bent piece 6c is provided on the tank plate 6, and a bent piece 10b provided on the baffle plate 10 is formed by the outer bent piece 6c and the tank plate receiving portion 7a of the end plate 7. According to the structure in which the baffle plate 10 is attached to the outside, the entire width of the tank plate 6 is increased by that amount because the outer bent piece 6c protrudes outward, and the outer bent piece 6c is bent with the outer bent piece 6c. Since the O-ring 12 is required between the O-ring 12 and the piece 10b, the number of parts is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and prevents a fluid from directly colliding or flowing into an end plate and a tube, and makes the flow rate of the fluid flowing into the tube side uniform. In addition to improving heat exchange efficiency, trapping of foreign matter such as solidification of casting sand and residual cutting chips during engine processing, the baffle plate can be attached with a simple structure without increasing the width of the tank plate.

[0010]

According to the first aspect of the present invention, a plurality of holes provided in a baffle plate are opposed to a rectifying piece at a predetermined interval.

According to the second aspect of the present invention, the straightening piece is formed from a cut and raised piece obtained by cutting and raising a baffle plate.

According to the third aspect of the present invention, the point that the passage area of each hole provided in the baffle plate is smaller than the passage area of the tube, and the passage height of each hole is smaller than the passage height of the tube. The points and the total channel area obtained by combining the channel areas of the holes were set so as to satisfy any one or all of the points larger than the total channel area of the tube.

According to the invention of claim 4, the opening side of the side plate of the baffle plate is gradually widened to form an inclined portion,
The side plate of the tank plate is also provided with an inclined portion inclined in the same direction as the above-mentioned inclined portion, and the baffle plate is supported by contact between the two inclined portions.

According to the fifth aspect of the present invention, the rectifying piece is provided so as to be located on the upstream side of each hole.

According to a sixth aspect of the present invention, a rectifying piece is provided downstream of each hole of the baffle plate.

According to the invention according to claim 7, each hole formed in the baffle plate extends in a direction perpendicular to the longitudinal direction of the baffle plate, and a plurality of cut-and-raised pieces formed in the longitudinal direction. Consists of openings.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 1 to 4
FIG. 9 is a diagram showing an embodiment of a heat exchanger according to the present invention, and the same components as those in FIG. 8 are denoted by the same reference numerals and description thereof is omitted. In each figure, a plurality of the flat tubes 3 are arranged in parallel with each other in the longitudinal direction of the tank 4, and fins 20 formed in a meandering manner are arranged between the tubes 3. Is done. The central portion of each of the tubes 3 has a partition portion 3f for partitioning the inflow path 1 and the return flow path 2, and the distal end side of each of the tubes 3 has a tube insertion hole formed in the end plate 7. 7c. The partition plate 5 assembled to the tank plate 6 and the end plate 7 has a plurality of concave portions 5a on its end face to be fitted with the partition portions 3f of the tube 3;
The inside of the tank 4 is divided into a fluid introduction section 4m and a fluid introduction section 4n.

A baffle plate 30 as shown in FIGS. 3 and 4 is located at the fluid introduction section 4m formed by being partitioned by the partition plate 5. In the baffle plate 30, a plurality of holes (slits) 32 extending in a direction perpendicular to the longitudinal direction of the plate body 31 are arranged in the plate body 31 formed of a long plate. Each of the holes 32 is formed by pressing a portion of the plate body 31 corresponding to each of the holes 32 in the upward direction. On the other hand, as shown in FIG. The cut-and-raised piece 33 constitutes the rectifying piece of the present application. In this case, the cut-and-raised piece 33 is integrated with the plate main body 31 via the rising pieces 33a at both ends. The same effect can be obtained by forming the cut and raised piece 33 by pressing a portion corresponding to each hole 32 of the plate body 31 in the lower direction.

With the rectifying piece composed of the cut and raised piece 33,
As shown in FIG. 5, the fluid M introduced in the direction of the plate body 31 does not flow directly from the hole 32 to the end plate side and the inflow path 1 side of the tube 3, and the fluid M formed by the cut-and-raised piece 33 has After the direction has been changed to the lateral direction after once hitting the plate body 31 from the side, it enters the end plate side and the direction of the inflow path 1 of the tube 3. That is, on the end plate side and on the upstream side of the inflow passage 1 of the tube 3, the fluid enters the inflow passage 1 after the flow is rectified in both directions of the baffle plate 30 by the baffle plate 30, so that the fluid directly flows into the end plate. The fluid does not collide and the flow rate of the fluid flow is made uniform. Therefore, even at the end plate and the tube near the inlet pipe 8, the flow rate does not protrude and increase, and becomes almost equal to the flow rate at a position away from the inlet pipe 8. 6 and 7 are diagrams showing the distribution of the flow rate for each tube when there is no baffle plate and when the baffle plate of the present invention is provided. As shown in FIG. Although the flow rate at the position P corresponding to the pipe 8 becomes large, according to the first embodiment, as shown in FIG. It can be understood that the flow rate hardly changes.

The baffle plate 30 has a side plate 34 which rises from three outer peripheries of the baffle plate main body 31 serving as a bottom plate. A corner portion of the side plate 34 is cut out to form a notch 35, Also,
One side plate 38 on the side facing the partition plate 5
Is lower in height. Each of the side plates 34 abuts on the front and rear side plates 6g of the tank plate 6 and the side plate 6h facing the partition plate 5 at the fluid introduction portion 4m,
The low side plate 38 is in contact with the surface of the partition plate 5, and the plate body 31 is positioned so as to be parallel to the bottom surface of the tank plate 6. In this case, each side plate 34
An inclined portion 36 is provided at a substantially central position of.
The inclined portion 36 is provided at a substantially middle portion of the side plate 34 of the baffle plate 30, and has a distal end surface 37 of the side plate 34.
It gradually inclines outwardly in the direction of.

The baffle plate 30 is fitted into the fluid introduction portion 4m of the tank 4 from the baffle plate main body 31 serving as a bottom plate.
7 is attached in a state where it substantially coincides with the tip 6t of the side plates 6g, 6h. In this case, an inclined portion 6x that is inclined in the same direction as the inclined portion 36 is also formed on the three side plates 6g and 6h of the tank plate 6 facing the side plate 34. As described above, the baffle plate 30 having a substantially inverted U shape is formed.
The inclined portion 36 is provided on the side plate 34, and the inclined portion 36 is brought into contact with the inner surface side of the inclined portion 6x provided on the side plates 6g and 6h of the tank plate 6, whereby the position of the inclined portion 36 is regulated by the inclined portion 6x. Thus, the baffle plate 30 is held at a fixed position by the spring force of the side plate. Since the side plate 38 of the baffle plate 30 abuts on the inside of the partition plate 5, the baffle plate 30 is not attached at an angle.
Therefore, the baffle plate 30 is connected to the introduction portion 4 m of the tank 4.
After being mounted inside, the end surface 7 of the end plate 7 is fitted to the rising portion 7m so that the end surface 37 of the side plate 34 is
The tip 6t of the side plates 6g, 6h is held by being pressed inward by the plate body 7g of the end plate 7, and the side plates 6g, 6h are firmly brazed and fixed inside the rising portion 7m.

In this embodiment, an important point is that the main body 31 and the cut-and-raised piece 33 constituting the rectifying piece are provided. Due to the cutting and raising, foreign matters such as agglomeration of molding sand (in many cases, agglomeration by a coupling agent) or relatively large foreign substances such as engine gasket sealing material and cutting chips during processing of engine parts are trapped. Sand can be prevented from entering the tube in the direction of the inflow path 1, and the problem of hot water erosion, which has conventionally been a problem, can be alleviated. The preferable relationship of the flow channel area for alleviating the problem of hot water erosion is as follows. a, the flow path area S1 of each hole 32 is equal to the flow path area S of the tube 3.
Less than 2. b, the flow path height of each hole 32 (the above-mentioned interval L) is smaller than the flow path height H of the tube 3. c, the total flow area of the flow path area S1 of each hole 32 is larger than the total flow area of the tube 3. By satisfying any or all of the above a and b, it is possible to improve the hot water erosion resistance. Further, by satisfying c, an increase in water flow resistance can be suppressed as much as possible.

Next, a structure for attaching the tank plate 6 to the end plate 7 will be described. A plurality of relatively high claws 7t are formed on a rising portion 7m provided on the outer periphery of the end plate 7 so that the claws 7t correspond to the inclined portions 6x formed on the side plates 6g and 6h of the tank plate 6. The tank plate 6
Can be reliably fixed to the end plate 7 side.

In the present invention, the size of the diameter of each hole 32 is not limited to being set to the same size over the whole, and the size of the diameter of the hole 32 increases as the distance from the inlet pipe 8 increases. May be gradually increased. However, also in this case, the distance L between the plate body 31 and the straightening piece formed of the cut and raised piece is always the same.

Each hole 32 does not necessarily extend in a direction perpendicular to the longitudinal direction of the baffle plate, but may extend in a direction parallel or oblique to the longitudinal direction. In addition, it is a matter of course that the rectifying piece may be provided on the downstream side of each hole of the baffle plate.

[0026]

According to the first aspect of the present invention, a plurality of holes are formed in the baffle plate, and the flow regulating pieces are opposed to each other with a certain interval in each hole. Flow can be rectified, and the flow rate of the fluid can be made uniform, so that the fluid can be uniformly supplied to each tube, improving the heat exchange efficiency and flowing in from the inlet pipe at the same time. Since the fluid does not directly hit the end plate directly below or flow into the tube, the erosion resistance against hot water is improved.

According to the second aspect of the present invention, since the straightening piece is formed from the cut and raised piece, the structure is simplified without increasing the number of parts.

According to the third aspect of the present invention, the point that the passage area of each hole 32 of the baffle plate is smaller than the passage area of the tube, and the passage height of each hole 32 is smaller than the passage height of the tube. Since the point and the total flow area of the flow area of each hole are set to satisfy one or all of the points larger than the total flow area of the tube, the flow resistance increases due to the baffle plate. While reducing as much as possible, solidification of the molding sand and foreign substances such as engine processing chips can be trapped, and erosion due to these can be prevented.

According to the fourth aspect of the present invention, the side plate of the baffle plate is formed with an inclined portion having a shape such that the diameter of the opening gradually increases, and the side plate of the tank plate is also inclined in the same direction as the inclined portion. Since the baffle plate is supported by the contact between the two inclined portions and the spring force of the side plate, the width of the tank plate is not increased as in the conventional case, and the number of parts is increased. The baffle plate can be securely fixed without the need.

According to the fifth aspect of the present invention, since the rectifying piece is provided so as to be located on the upstream side of each hole, the fluid flowing from the inlet pipe can be rectified well.

According to the sixth aspect of the present invention, since the flow regulating pieces are provided on the downstream side of each hole of the baffle plate, the fluid can be rectified well.

According to the present invention, each hole formed in the baffle plate is formed by a plurality of slits extending in a direction perpendicular to the longitudinal direction of the baffle plate and arranged in the longitudinal direction. And the erosion resistance of hot water can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing one embodiment of the present invention.

FIG. 3 is a sectional view showing one embodiment of the present invention.

FIG. 4 is a perspective view showing a main part of the present invention.

FIG. 5 is a diagram showing the operation of the embodiment of the present invention.

FIG. 6 is a diagram showing flow characteristics of a conventional heat exchanger.

FIG. 7 is a diagram showing a flow rate characteristic obtained by an embodiment of the present invention.

FIG. 8 is a sectional view of a main part showing an example of a conventional heat exchanger.

FIG. 9 is a cross-sectional view of a main part showing an example of a conventional heat exchanger.

FIG. 10 is a plan view of a main part showing an example of a conventional heat exchanger.

[Explanation of symbols]

1 inflow channel, 2 return channel, 3 flat tube, 4 tank, 5 partition plate, 6 tank plate, 7
End plate, 8 inlet pipe, 9 outlet pipe,
30 baffle plate, 31 baffle plate main body, 32 holes, 33 cut and raised piece, 34 side plate, 36 inclined portion, 37 tip surface.

Claims (7)

[Claims] 1. A heat exchanger in which a baffle plate is provided in an inlet tank, wherein a plurality of holes are formed in the baffle plate, and a flow regulating piece is opposed to each hole at a constant interval. A heat exchanger. 2. The heat exchanger according to claim 1, wherein the straightening piece is formed from a cut and raised piece obtained by cutting and raising the baffle plate corresponding to each of the holes. 3. The flow path of each hole provided in the baffle plate is smaller than the flow path area of the tube; the flow path height of each hole is smaller than the flow path height of the tube; 2. The heat exchanger according to claim 1, wherein a total flow area obtained by integrating the flow areas is set so as to satisfy one or all of the points larger than the total flow area of the tube. 4. A side plate of the baffle plate is formed with an inclined portion inclined outwardly with respect to a tip direction of the side plate, and a side plate of the tank plate is also provided with an inclined portion inclined in the same direction as the inclined portion. A heat exchanger configured to support the baffle plate by contact between the two inclined portions and a spring force of the side plate. 5. The heat exchanger according to claim 1, wherein the rectifying piece is provided so as to be located upstream of each hole. 6. The heat exchanger according to claim 1, wherein the rectifying piece is provided at a position downstream of each hole. 7. Each of the holes formed in the baffle plate includes:
2. The heat exchanger according to claim 1, comprising a plurality of cut-and-raised opening portions extending in a direction perpendicular to the longitudinal direction of the baffle plate and formed in the longitudinal direction.