JP3028452B2 - Tube element for stacked heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated heat exchanger, and more particularly to a tube element.

[0002]

2. Description of the Related Art In a heat exchanger in which fins and tube elements are alternately stacked, a bead is conventionally formed in a heat exchange medium passage of a tube element to increase the heat exchange efficiency so that the heat exchange medium flows. It is considered to diffuse and increase the contact area with the heat exchange medium. In the present applicant, too, a large number of round beads are integrally press-formed on a forming plate constituting a tube element, and the conventional product is a tube element 41 as shown in FIG. Are formed at a right angle to the flow direction of the heat exchange medium flowing through the heat exchange medium passage 6 of each of the above. Each of the bead rows has a plurality of beads 20 arranged at equal intervals. If the row consists of 5 beads,
The (n + 1) th row is composed of six beads, and is provided so as to be repeated thereafter. The beads of the adjacent bead row are projected in the direction of forming the heat exchange medium passage 6 (vertical direction in the figure). They are arranged so that they do not overlap. Further, in every other bead row, all the beads overlap when projected in the direction in which the heat exchange medium passage 6 is formed, and the beads 2 have a uniform density as a whole.
0 is formed.

[0003]

For example, when a plurality of obstacles A are sequentially arranged in the traveling direction of the fluid as shown in FIG. It is known that it spreads on both sides of A and flows without hitting the obstacle A behind, and forms a so-called dead water area. In the bead 20 of the conventional tube element 4 as well, a dead water area is formed and heat exchange is performed. It is expected that there is a bead 20 that does not significantly contribute to the above. Such a bead in the dead water area should be rather absent in reducing the passage resistance, and it is preferable to reduce the passage resistance and flow the heat exchange medium as much as possible to promote heat exchange.

[0004] In addition to the problem of the dead water area, since the heat exchange medium tends to flow through the shortest flow path, for example, it has a U-shaped heat exchange medium passage 6 like a tube element in FIG. In an object, it tends to flow along the central ridge 10. In conventional tube elements, beads are formed at equal intervals at a uniform density throughout the passage,
There is no difference in passage resistance in the entire passage, and therefore, the heat exchange medium flows along the ridge, and a stagnation region of the heat exchange medium is formed as in the upper side of the tube element.

[0005] In view of the above, there is room for further improvement in the arrangement of the beads of the tube element.

[0006] Therefore, in the present invention, distribution to dead water areas is performed.
To improve the heat exchange efficiency by improving the arrangement of the bead of the tube element while considering the point of reducing the bead to be formed and the point of diffusing the fluid by adjusting the passage resistance. It is an issue.

[0007]

The gist of the present invention resides in that the fins and the fins are alternately stacked in a plurality of stages, and a passage of the heat exchange medium is formed by combining two forming plates. And the molding preform inside the passage.
In the tube element of the laminated heat exchanger in which a bead is formed so as to protrude from the sheet, the two forming plates
A bead projecting from one of the
The vias that are joined and formed on each molding plate
At equal intervals perpendicular to the longitudinal direction of the passage.
Arrange as many rows of beads side by side
The rows are in front of a row of beads interspersed with said beads at a first interval.
The beads are interspersed at a second interval different from the first interval.
Bead rows having a predetermined regularity in the longitudinal direction of the passage.
Are arranged alternately next to each other in the longitudinal direction.
The two matching bead rows are the beads that make up each bead row.
Are scattered at different positions in the direction perpendicular to the longitudinal direction.
That you are doing.

The gist of the invention of claim 2 is that the fins are alternately stacked in a plurality of stages, a passage of the heat exchange medium is formed by combining two forming plates, and the inside of the passage is formed. In the tube element of the laminated heat exchanger having a bead projecting from the forming plate, a bead projecting from one of the two forming plates.
The plate is joined with a bead projecting from the other
The bead formed in the forming plate is extended along the length of the passage.
As many rows of beads aligned perpendicular to the direction
Place this multiple bead row on the missing bead
A plurality of types of bead rows each having a predetermined portion
Missing part of the bead by arranging with regularity
To form a bead-free path in the passage
Two beads adjacent to each other in the longitudinal direction.
The row of beads is such that the beads constituting each row of beads are
That is, it is scattered at different positions in the direction perpendicular to the direction .

[0009]

Therefore, in the first aspect, the heat exchange medium
Beads at the first interval in the longitudinal direction of the passage where the air flows
Beads at a second interval different from the first interval.
Alternately with a bead row interspersed with a predetermined regularity
Two beads adjacent to each other in the longitudinal direction of the passage
Row of beads at different locations in the longitudinal and vertical directions of the aisle
Since the beads are scattered, the density of beads
Part, that is, dead water area where beads are not placed is regular
In addition, the flow resistance of the heat exchange medium can be promoted by reducing the passage resistance as compared with a tube element in which beads are arranged at a uniform density.

[0010] In the second aspect, the bead is missing.
Several types of bead trains with
In the longitudinal direction of the passage and in this longitudinal direction
The beads of two bead rows adjacent to the longitudinal direction of the passage
Vertically scattered at different positions and each bead row
Formed by the missing part of the bead
So that there is no bead in the passage
This way, this path will increase the bead density
The rough part, that is, the dead water area where the beads are not placed
Dead water that can be formed and beaded
Area can be reduced and there are no beads
Does the path have less passage resistance than other parts?
The heat exchange medium is easier to flow through this path,
Even if the passage is formed in a U-shape to straddle the ridge,
The inconvenience that flows unevenly along the strip is eliminated, and
You will be around.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a first embodiment, in which a laminated heat exchanger 1 is, for example, a four-pass evaporator in which fins 2 and tube elements 3 are alternately laminated in a plurality of stages. , The tube element 3 is formed by joining two forming plates 4 and 4 at the peripheral edge thereof, and has two tanks 5 on the air upstream side and the air downstream side on one end side and the other end between the tanks 5 on the other end side. Each has a heat exchange medium passage 6 through which the heat exchange medium passes.

The forming plate 4 is formed by pressing an aluminum plate. As shown in FIG. 2, two bowl-shaped bulging portions 8, 8 are formed at one end. At the same time, a passage-forming bulging portion 9 is formed, and the passage-forming bulging portion 9 is provided between the two tank-forming bulging portions 8, 8. A ridge 10 extending to near the end is formed. Each tank forming bulging portion 8 is provided with a passage forming bulging portion 9.
The ridge 10 is larger than the ridge 10 and
Is joined to the other ridge when joining at the periphery thereof, and the heat exchange medium passage 6 is partitioned to near the other end of the tube element 3 to form a U-shape as a whole. In the tube elements 3a at both ends, the outer forming plate is formed flat.

The tanks 5 of the adjacent tube elements 3 are abutted by the bulging portions 8 for forming the tanks of the respective forming plates 4, except for a blind tank 5a formed on one side of the substantially central tube element. Thus, they communicate with each other through communication holes 13 formed in the bulging portion 8 for tank formation.

An end plate 14 is joined to the tube elements 3a at both ends via the fins 2,
An entrance / exit portion 15 communicating with the tank 5 is provided between the end plate 14 and the end plate 14. The entrance 15 is formed by connecting two bowl-shaped members 16a and 16b, and one end thereof is opened so that piping can be connected.

Thus, the heat exchange medium entering from one of the inlet / outlet portions 15 enters the tank 5 on the side of the blind tank 5a of substantially half of the tube element, and rises along the heat exchange medium passage 6 along the ridge 10 from there. The U-turn is made above the ridge 10 and descends to reach the tank on the side opposite to the blind tank 5a side.
After that, it moves parallel to the remaining half of the tube element 3 tank, rises again along the heat exchange medium passage 6 along the ridge 10, makes a U-turn above the ridge 10, and descends, and goes to the blind tank 5a side From the tank 5 through the other entrance 15. For this reason, the heat of the heat exchange medium is transmitted to the fins 2 and exchanged with the air passing between the fins in the process of flowing through the heat exchange medium passage 6.

A bead 20 is integrally formed on the forming plate 4 of the tube element 3 constituting such a heat exchanger, and the bead 20 projects inward from the inner surface of the forming plate 4. It joins with the bead 20 of the molding plate 4 joined to each other, and contributes to the improvement of the heat exchange efficiency.

The beads 20 are formed as a number of bead rows arranged at regular intervals in a direction perpendicular to the direction (longitudinal direction) of the heat exchange medium passage 6, and the adjacent bead rows have a bead interval. Is different. In this embodiment, assuming that five beads are provided at regular intervals at an interval a on the n-stage surface, three beads are arranged at an interval b at the (n + 1) -th stage.
In the n + 2 step, there are five beads at the interval a again, and at the n + 3 step, three beads at the interval b, and so on. Interval b
Are repeatedly formed. In addition, the interval b is twice as large as the interval a .
As can be seen, the row of beads at the interval b corresponds to the longitudinal direction of the passage.
There are two types of beads with different bead positions in the vertical direction (B1, B
2), A → B1 → A → B2 → A → B1 in the longitudinal direction
→ A → B2 with a predetermined regularity.

Each bead 20 in the adjacent bead row is arranged so as not to overlap when projected in the longitudinal direction (vertical direction in the figure) of the heat exchange medium passage 6, in other words,
The beads constituting each bead row are connected to the heat exchange medium passage 6.
Dotted at different positions in the vertical direction to the longitudinal direction
In this embodiment, the closest bead in the next row from a certain bead is arranged so as to be inclined at 30 degrees with respect to the longitudinal direction of the heat exchange medium passage. Also in this case, a regular pattern in which the bead groups arranged at the interval a and the bead groups arranged at the interval b appear alternately is formed.

Further, as another embodiment of the tube element 4 (second embodiment), as shown in FIG. 3, the bead
Is perpendicular to the forming direction (longitudinal direction) of the heat exchange medium passage 6.
It is formed as a large number of bead rows aligned in a vertical direction. In adjacent bead rows, areas where the beads 20 are not formed are different, and areas where no beads of the adjacent bead rows are formed are connected to form beads. Path 21 that doesn't exist
May be formed in a direction different from the longitudinal direction of the heat exchange medium passage 6. In this embodiment, FIG.
As you can see, through the five rows of beads with missing beads
By arranging it with a predetermined regularity in the longitudinal direction of the road,
Forming a path 21 where no cables exist,
In two adjacent bead rows,
The beads that make up the row are different in the direction perpendicular to the longitudinal direction.
Scattered in the same position, without missing the conventional beads
The tube element having uniformly formed beads (see FIG. 8) is inclined at 30 degrees with respect to the longitudinal direction of the passage 6.
A meandering path 21 is formed .

Therefore, in each of the first and second embodiments, the bead in the dead water area is reduced, so that the area having a small passage resistance is formed in the entire heat exchange medium passage 6 without deteriorating the heat exchange efficiency. The heat exchange medium can be formed to promote the flow of the heat exchange medium to the region having a small passage resistance, to spread the heat exchange medium without stagnation over the entire tube element, and conversely to improve the heat exchange efficiency.

In evaluating the tube element having the above-described bead arrangement in comparison with a conventional tube element, the present applicant attempted the following experiment.

In each of the conventional tube element, the tube element of the first embodiment (hereinafter referred to as type 1), and the tube element of the second embodiment (hereinafter referred to as type 2), as shown in FIG. A heat generating plate 22 is attached to one entire surface of the forming bulging portion 9 using a silicone adhesive, and the heat insulating material 3 is covered so as to cover the entire surface.
0, an AC power supply is connected to the heat generating plate 22, and a certain amount of heat is applied to each tube element 4 to uniformly heat it. Then, a certain amount of tap water is supplied to the inlet pipe 2 having a length of 500 mm.
It is supplied to the tube element 4 through 3 and is led from one tank to the other tank via the heat exchange medium passage, and is discharged from the outlet pipe 24. Tap water supplied from the inlet pipe 23 is detected by the flow meter 25, and the surface temperature of each tube element is changed by changing the flow rate of tap water to 5 cc / sec, 10 cc / sec, and 20 cc / sec. It was decided to measure. The results are shown by the thermographics in FIGS.

Further, tap water is supplied at 5 cc / sec, 10 cc / sec,
0 cc / sec, the thermocouples 26, 2 provided at the inlet and outlet of the tube element 4 in each case.
7, the temperature difference between the inlet and outlet (°
C) was measured. Table 1 shows the results.

[0025]

[Table 1]

An inlet static pressure hole 31 formed in the inlet pipe 23 and an outlet static pressure hole 3 formed in the outlet pipe 24.
2, the pressure at the entrance and exit was measured by the pressure gauge 33, and the water resistance (mmHg) of the tube element 4 was determined. Table 2 shows the results.

[0027]

[Table 2]

Further, in order to observe how much the heat exchange varies in the direction perpendicular to the direction in which the heat exchange medium passage 6 is formed, the surface of the tube element 4 (the surface opposite to the side where the heat generating plate is provided) The average of the temperature difference (° C.) in the direction perpendicular to the flow direction of the fluid was measured by a thermocouple group 29 provided at a plurality of predetermined locations (24 locations). Table 3 shows the results.

[0029]

[Table 3]

The difference in temperature between the entrance and the exit indicates that the larger the difference, the more active the heat exchange is. According to the experimental results, the type 1 and the type 2 are almost the same as the conventional products. Slightly larger, 5cc / sec or 20cc
For a flow rate of / sec, type 1 has a larger temperature difference than type 2.

In terms of water flow resistance, type 1 and type 2
Although it was larger than the conventional product at 5 cc / sec, it was 10 cc / s
At ec, the flow rate of 20 cc / sec is smaller than that of the conventional product, and in view of the fact that the actual flow rate in the heat exchanger is around 10 cc / sec, it can be considered that the passage resistance is reduced in any case. In addition, type 2 has smaller water flow resistance than type 1.

The heat exchange is more uniform when the isotherms in FIGS. 5 to 7 are horizontal (perpendicular to the heat exchange medium passage) or as the temperature difference is smaller in Table 3. This is desirable, and type 1 and type 2
All can be said to be superior to conventional products.

Therefore, these experimental data show that Type 1 and Type 2 have improved heat exchange properties despite the fact that the number of beads is smaller than that of the conventional product. It can be said that the tube element has a bead arrangement in which the bead in the dead water area is reduced and the heat exchange medium spreads over the whole passage without stagnation than the conventional product.

[0034]

As described above, according to the first aspect of the present invention, a bead row at the first interval and a bead row at the second interval are provided.
Are arranged alternately in the longitudinal direction of the passage with a predetermined regularity,
Beads of two adjacent bead rows in this longitudinal direction
Are scattered at different positions in the longitudinal direction and the vertical direction, and
According to the invention of claim 2, the missing portion of the bead is
Several different types of bead trains can be
Arranged in the longitudinal direction, two adjacent ones in this longitudinal direction
Position the beads in the row of beads differently in the longitudinal and vertical directions
In addition to interspersing the beads,
The path that has no bead in the passage by the dropped part
Bead and water distribution in the dead water area.
Bead arrangement to reduce road resistance ,
The heat exchange medium can be spread over the entire passage to eliminate stagnation, and as a result, the heat exchange efficiency can be increased.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of a laminated heat exchanger.

FIG. 2 is a view showing an example (type 1) of a forming plate used for a tube element of a laminated heat exchanger.

FIG. 3 is a diagram showing another example of a forming plate (type 2) used for a tube element of a laminated heat exchanger.

FIG. 4 is a diagram showing an experimental device for evaluating the performance of a tube element.

FIG. 5 shows a thermographic of the tube element when the flow rate of tap water is 5 cc / sec,
(A) shows a conventional tube element, (b) shows a type 1 tube element, and (c) shows a type 2 tube element.

FIG. 6 shows a thermographic of a tube element when the flow rate of tap water is 10 cc / sec;
(A) shows a conventional tube element, (b) shows a type 1 tube element, and (c) shows a type 2 tube element.

FIG. 7 shows a thermographic of the tube element when the flow rate of tap water is 10 cc / sec,
(A) shows a conventional tube element, (b) shows a type 1 tube element, and (c) shows a type 2 tube element.

FIG. 8 is a view showing a conventional tube element of a laminated heat exchanger.

FIG. 9 is an explanatory diagram showing a flow of a fluid when there is an obstacle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stacked heat exchanger 2 Fin 3 Tube element 4 Forming plate 6 Heat exchange medium passage 20 Bead

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F28F 3/04

Claims (2)

(57) [Claims] 1. A heat exchange medium passage is formed by alternately stacking a plurality of fins with a plurality of tiers, and a bead protrudes from the formation plate inside the passage. In the tube element of the stacked heat exchanger, the beads protruding from one of the two forming plates are the other.
With the bead projecting from
The bead formed in the seat is aligned in the longitudinal direction of the passage.
As many rows of beads at equal intervals in the vertical direction.
The plurality of bead rows are arranged at a first interval.
And a second row different from the first interval
The row of beads interspersed with the beads at intervals is the length of the passage.
Alternately arranged in the hand direction with a predetermined regularity,
Two bead rows adjacent to each other in the direction
Beads constituting a row of beads are perpendicular to the longitudinal direction.
A tube element for a stacked heat exchanger, wherein the tube element is scattered at different positions in directions . 2. A are stacked in a plurality of stages alternate with fins, two inside the bi from the molding plate <br/> over de of the passageway together with the molding plates together passages of the heat exchange medium is formed In the tube element of the laminated type heat exchanger in which the protrusions are formed, the beats protruding from one of the two forming plates are the other.
With the bead projecting from
The bead formed in the seat is aligned in the longitudinal direction of the passage.
And place them in a number of vertically aligned rows of beads,
The multiple bead rows have missing portions of the beads.
Several types of bead rows having a predetermined regularity in the longitudinal direction.
By distributing it by the missing part of the bead
Forming a bead-free path in the passage,
Two bead rows adjacent to each other in the longitudinal direction are:
The beads constituting each bead row are aligned with the longitudinal direction.
Characterized in that they are scattered in different positions in the vertical direction .