JPS61252495A - Laterally laminated type heat exchanger - Google Patents

Abstract

PURPOSE:To prevent a dead space due to the lowering of the heat exchange performance and the inclination of the heat exchanger as a whole and to reduce the quantity of water splashing by specifying the fin pitch of corrugated fins and the fin height thereof. CONSTITUTION:The fin pitch fp of corrugated fins 2 is set in a range of 3.2-4.0mm and the height (h) of the fin is set in a range of 14-20mm. In a case where the fin pitch fp is more than 3.2mm and the fin height H is more than 14mm, the quantity of water splashing can be effectively suppressed. However, in a case where the fin pitch fp exceeds 4.0mm, the heat transfer area of the fin 2 is reduced, and the lowering of the performance of the heat exchanger becomes remarkable. Further, even if the fin height H exceeds 20mm, not only the fin efficiency but also the number of tube elements 1 in the same capacity is reduced, and this causes the abrupt lowering of the performance.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a W4-layer heat exchanger, such as the one used as an evaporator in a car cooler, and particularly to a W4-layer heat exchanger, in which a plurality of plate-like tube elements forming refrigerant passages are connected to each other. The present invention relates to a type of stacked heat exchanger that is stacked one above the other with an air flow gap including corrugated fins therebetween.

Conventional technology The well-known laminated heat exchanger is generally
A tank in which a heat exchange section is formed by alternately stacking a pair of press-worked metal molded plates to form heat medium passages and corrugated fins, and a heat exchange medium is stored at one or both ends of the heat exchange section. It has advantages such as being able to easily follow changes in load and having relatively excellent performance relative to its volume. Therefore, when such a laminated heat exchanger is used as an evaporator for a car cooler, it generally includes a heat exchange medium passage formed by each pair of molded plates. A vertical heat exchanger with tube elements arranged vertically (
For example, it is often used as Utility Model Publication No. 56-6847). The main reason for this is that by arranging the tube elements vertically, water droplets generated as condensation water from air flowing through the air circulation gap including the fins between them are quickly directed downward along the upper and lower tube elements. By being able to be excluded.

However, due to the structure of the car, for example, if the space to accommodate the evaporator is longer horizontally than vertically, or in other words, if it is longer horizontally, the heat exchanger may be of a vertical type. It is better to use it horizontally than to use it.
In some cases, it is possible to increase the effective area for heat exchange and make it more efficient.

Problems to be Solved by the Invention However, when the tube element is configured as a horizontal type (for example, Japanese Utility Model Publication No. 53-32375), the condensed water adheres to the upper surface of the tube element and heat is generated. The urging force of the air flowing through the exchanger pushes the water to the leeward side and concentrates on the edge of the tube element, which is then blown away by the circulating air and flies into the interior of the car, creating a so-called water splash problem. The problem was that it was easy to do.

To solve this problem of water splashing, a condensation water flux receiving groove is installed on the periphery of the tube element, especially on the air outflow side, so that the condensation water on the top surface of the tube element can be quickly discharged to the outside of the heat exchanger. However, there is a limit to increasing the size of the bundle groove in a limited space because, on the other hand, it causes a decrease in heat exchange performance due to the narrowing of the refrigerant passage in the tube element. It wasn't something. It has also been considered to tilt the entire heat exchanger to facilitate the flow of condensed water, but this creates dead space, which poses problems in terms of effective use of the installation space, and depending on the model, tilting itself may not be possible. there were.

This invention was made in view of the above circumstances, and aims to provide a horizontal stacked heat exchanger that solves the problem of water splashing without deteriorating heat exchange performance or creating dead space. purpose.

Means for Solving the Problem In order to achieve this objective, the inventor conducted various experiments and research and analyzed the mechanism of water splashing of condensed water. As a result, the corrugated fins present between the tube elements It has been found that water splashing can be suppressed by setting the fin height and fin pitch of corrugated fins within a certain range, and has completed the present invention. be.

That is, the present invention, as shown in FIGS. 1 to 4, includes a plate-shaped tube element (1) and a corrugated fin (
2) in a horizontal stacked heat exchanger in which multiple stages of corrugated fins (2) are stacked alternately and vertically, the fin pitch (fO) of the corrugated fins (2) is set in a range of 3.2 to 4.0-. The gist of the present invention is a horizontal stacked heat exchanger characterized in that the fin height H) is set in the range of 14 to 20 am.

The tube element (1) has a flat heat exchange medium passage (1a) in the middle part, and has a flat heat exchange medium passage (1a) at both ends.
It has a tank part (1b) that communicates with the tube element (1a) and has a relatively large expansion height, and has a tank part (1b) that communicates with the adjacent tube element (1a).
1) The tank parts (1b) in (1) are integrated by soldering. Further, a concave condensation water flux receiving groove (3) having a predetermined depth is formed in the peripheral edge of the tube element (1). Generally, such a tube element (1) is produced by press-forming two metal sheets into four parts with different depths at both ends and the middle part, and into an oppositely directed concave part with a predetermined depth and width at the peripheral edge. This is done by stacking the molded plates facing each other and joining and integrating each plate at the top surface of the recessed portion of the periphery.

The corrugated fin (2), as shown in FIG.
Each folded piece (2a) continuous to the upper and lower curved folded parts
(2a) are folded vertically at equal intervals in the length direction of the fin. In addition, corrugated fins (
2) is a state in which the width in the air flow direction shown by the arrow (W) in Fig. 3 is set to be approximately the same as the width of the tube element (1), and both ends thereof are aligned with both ends of the tube element. It is located in Corrugated fin (2) is
Generally, aluminum is used, and preferably one with cut and raised louvers is used.

In the figure, (4) (4') are the upper and lower side plates placed on the outside of the outermost corrugated fin (2) < 2), (5) (5') are for the inflow and outflow of the heat exchange medium. One member of the inlet header and one member of the outlet header, (6) (6”) are the heat exchange medium inlet pipe and the same outlet pipe, (7) is arranged in the heat exchange medium passage (1a) of the tube element (1). The inner fin (8) is a heat exchange medium inlet hole that opens into the tank portion (1b) of the uppermost tube element (1).

By the way, in this invention, the fin pitch (fp) and fin height 1-1) of the corrugated fin (2) are 3.2a≦fp≦4.0 and 14j*≦H≦20a, respectively.
The condition is that it is set in the range of m+. This condition was discovered by the inventor through the following analysis of the water splash phenomenon and elucidation of the correlation between the amount of water splash, the fin pitch of the corrugated fin, and the fin height. That is, the water droplets of condensed water condensed on the corrugated fins (2) or tube elements (1) are pushed toward the air outflow side by the urging force of the circulating air, and the condensed water droplets condensed on the corrugated fins (2) or the tube elements (1) are pushed toward the air outflow side, and are moved to the condensation water flux receiving grooves (3).
However, if the amount of dehumidification increases beyond the discharge capacity of the bundle receiving groove (3), the water overflowing from the bundle receiving groove (3) will flow down to the adjacent folded piece (2a) at the end of the corrugated fin (2).
) (2a) rises due to capillary forces and forms water II (9) of height h). This water film (9) reduces the air flow area between the adjacent folded pieces (2a) and increases the air passage speed above the water film. When the water film (9) is not present, the air passing speed is about 3 to 4 m/s, but when the air passing speed above the water film exceeds about 6 to 77 FL/s, water droplets are carried away by the air, It has been practically confirmed that water splashing occurs. Therefore, in order to prevent the occurrence of water splashing, the adjacent folded pieces (2a) (
2a) It is sufficient to secure as large an air flow area above the water film (9) as possible to suppress the air passage speed to about 67 FL/S or less, and for this purpose, the fin pitch (fl))
is increased to weaken the capillary force between adjacent folded pieces (2a) (2a), creating a water film (9) that is a factor in reducing the air circulation area.
They came up with the idea of suppressing the fin height h) and increasing the fin height H) to directly expand the air circulation area. From this point of view, the inventor conducted further experiments and found that the amount of water splash can be effectively suppressed when the fin pitch (fp) is 3.2 m or more and the fin height H) is 14 mm or more. be. However, the fin pitch (fp) is 4. If it exceeds 0m, the heat transfer area of the fins (2) will decrease, and the performance of the heat exchanger will be significantly reduced.If the fin height H) exceeds 20m, not only will the fin efficiency decrease. , the number of tube elements (1) in the same volume decreases, leading to a sharp drop in performance. Therefore, the fin pitch ([p) and fin height H) are limited to the above range.

Note that although the illustrated heat exchanger is shown as having a condensation water flux receiving groove (3) on the peripheral edge of the tube element (1), the heat exchanger is not provided with a condensation water flux receiving groove (3). Also good. However, it goes without saying that the presence of the bundle receiving groove (3) increases the drainage capacity and is more effective in suppressing the water splash phenomenon.

As described in detail, the horizontal stacked heat exchanger according to the present invention has corrugated fins with a fin pitch of 3.2 to 4.0.
m, and the fin height is 14 to 2.
Since it is set in the 0 range, it is possible to reduce the amount of water splashed without deteriorating heat exchange performance or creating dead space due to tilting the entire heat exchanger as in the conventional case. can.

Example Next, examples of this invention will be shown.

We created corrugated fins (2) that combined four types of fin pitches: 2゜8.3.2.3゜6.4.0am+ and four types of fin heights: 10.12.14.16. A heat exchanger shown in FIG. 1 was manufactured using these corrugated fins.

Then, each heat exchanger is operated under normal operating conditions,
The amount of water scattered from the heat exchanger within a certain period of time was actually measured, and the water splash of the heat exchanger using corrugated fins with a fin pitch of 2.8 rin and a fin height of 12 fins was 100%.
A relative comparison was made of the water droplets of each heat exchanger. The results are shown graphically in FIGS. 5 and 6. Note that FIG. 5 shows the fin pitch (fE) on the horizontal axis, and FIG. 6 shows the fin height (H) on the horizontal axis.

From the graph shown in FIG. 5, the fin pitch (rp) is 3.
It can be seen that water splash is effectively suppressed when the fin height is 2M or more, and the graph shown in Figure 2 shows that the fin height H)
It can be seen that when the distance is 14#l1m or more, the amount of water splash is effectively suppressed.

In addition, in order to investigate changes in heat exchange performance as the fin height H) of the corrugated fin increases, the heat exchange amount of the heat exchanger was investigated with various fin heights. The results are shown in the graph of FIG. 7 as a relative comparison where the fin height is 10a111 as 100%. As is clear from this graph, when the fin height H) exceeds 20 chambers, the heat exchange performance deteriorates significantly.

[Brief explanation of drawings]

The drawings show an embodiment of the horizontal stacked heat exchanger according to the present invention, and FIG. 1 is a front view with some parts omitted, and FIG.
The figure is an enlarged front view showing a part of the corrugated fin as seen from the air outflow side, Figure 3 is a cross-sectional view along ■-■ in Figure 1,
Fig. 4 is a plan view showing a part of the side plate cut away;
5 to 7 are diagrams showing the test results in the embodiment of the present invention, and FIGS. 5 and 6 are diagrams showing the relationship between the fin pitch of corrugated fins, the fin height, and the water carrier, and FIG. FIG. 2 is a diagram showing the relationship between fin height and heat exchange performance of a heat exchanger. (1)... Plate tube element, (2)... Corrugated fin, ('p)... Fin pitch, (H)
...Fin height. Applicant for the above patent: Showa Aluminum Co., Ltd. Figure 3 Figure 4 ¥ Toyofudo 8 8 8

Claims (1)

[Claims] In a horizontal stacked heat exchanger in which plate-like tube elements and corrugated fins are alternately stacked in multiple stages in the vertical direction, the fin pitch of the corrugated fins is 3.
A horizontal laminated heat exchanger characterized in that the fin height is set in a range of 2 to 4.0 mm, and the fin height is set in a range of 14 to 20 mm.