JPH025329Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an evaporator, and its main purpose is to improve the function of separating and discharging condensed water.

Generally, as shown in Fig. 1, a flat tube heat exchanger is used as an evaporator, which is a combination of flat tubes 1 bent in a zigzag shape and heat transfer fins 2 installed between the flat tubes 1. Heat exchange is performed between the refrigerant flowing in the flat tube 1 and the air flowing between the heat transfer fins 2.

This type of evaporator has the disadvantage that condensed water droplets that condense on the outer surface of the evaporator fly out into the room through the outlet grill along with the air flow, and countermeasures for this defect have become an important issue. There is.

Measures to prevent condensed water from splashing out indoors as described above include creating a large space in the air passage downstream of the evaporator that can reduce the air flow velocity and separate gas and liquid, and It is possible to install a filter to prevent leakage, but creating an unnecessary large space in the duct downstream of the evaporator or installing a filter will increase the size of the entire device and increase the cost, so it is not practical. It's difficult to serve.

Therefore, a tube with a large number of narrow grooves carved on the outer surface of a flat tube to allow the condensed water to flow out through the grooves has already been developed (see Japanese Utility Model Publication No. 7975/1983). Simply providing narrow grooves on the outer surface of the flat tube does not allow all of the condensed water to flow out accurately, and a considerable amount of the condensed water escapes together with the air.

The purpose of the present invention is to deal with the problems of the conventional device as described above, and as shown in Figures 2 to 6 below.
The embodiment shown in the figure will be explained.

In the present invention, as shown in Fig. 3, a groove 11 with a nearly triangular cross-sectional shape and a depth D that is approximately the same as the thickness of the flat tube is formed on the outer surface of a flat tube 1 made of an extruded aluminum or aluminum alloy material. Form in the longitudinal direction. As shown in FIG. 3A, the grooves 11 are formed in the upper and lower parts of the reinforcing ribs 12 of the flat tube 1, every other groove on the upper and lower surfaces.

The heat transfer fin 2 made of a corrosion-resistant aluminum alloy or the like is provided with a large number of small holes 21 within the range of porosity of 12 to 18%, and the diameter of the small holes 21 is smaller than the bending pitch P of the heat transfer fin 2. The small size should be approximately 2.2 to 2.6 mmφ.

The heat transfer fins 2 are combined with the flat tube 1 configured as described above and brazed in a furnace to form an integrated coil 3, and as shown in FIGS. 4 and 5, the ends of the heat transfer fins 2 are It has a convex part 41 that comes into contact with it and a concave part 42 into which the bending radius part 13 of the flat tube 1 fits, and it fits into the convex part 41, the concave part 42, and the concave part 42 by bending it by 90 degrees as shown in FIG. Using a water-absorbing heat insulating material 4 having ears 43 that continuously cover both sides of the flat tube bent radius part 13 etc., the water-absorbing heat insulating material 4 is attached to both ends of the coil 3 as shown in FIG. As shown in FIG. 5, the heat insulating material 4 is inserted and fitted into the reinforcing material 5, which has a U-shaped cross section and is installed in the evaporator storage duct 6 as shown in FIG. As shown, the ear portion 43 is bent at the flanges 51, 51 of the reinforcing member 5, and is assembled and fixed in a state that covers the entire both side surfaces of the convex portion 41 and the concave portion 42, including both side surfaces of the flat tube bent radius portion 13. be done. In FIG. 2, 7 is a heat insulating material stretched over the inner surface of the duct 6.

According to the present invention having the above-mentioned configuration, condensed water near the outer surface of the flat tube 1 and the part where the heat transfer fin 2 is brazed to the flat tube 1 is drained through the triangular cross-section formed on the surface of the flat tube 1. The flow enters the groove 11 and is sucked into the water-absorbing heat insulating material 4 at both ends of the flow coil 3.

In addition, the condensed water that wets the surface of the heat transfer fins 2 accumulates in the form of water droplets in the many small holes 21 due to surface tension, and since the hole diameter is small (approximately 2.2 to 2.6 mmφ), water retention is good and air flow is improved. without being carried to
After the water droplets grow to a certain size, they fall all at once onto the flat tube 1, and as described above, they travel through the grooves 11, flow laterally, and are sucked into the water-absorbing heat insulating material 4.

In the past, the condensed water that flowed sideways on the flat tube fell at the side end and splashed, and the splash flew into the room along with the airflow, but as described above, with the present invention. Both ends of the flat tube 1 and the heat transfer fins 2 are covered with water-absorbing heat insulating material 4.
The above-mentioned splashing of water droplets does not occur at all, and since the water-absorbing heat insulating material 4 is covered with the U-shaped reinforcing material 5, its water retention is extremely good, and at the same time, the condensed water sucked in is absorbed by its own weight. By using the U-shaped reinforcing member 5 as a guide, the water flows down quietly, and problems such as water being carried by the air flow and splashing into the room can be almost completely prevented.

Furthermore, it goes without saying that by providing a large number of small holes 21 in the heat transfer fins 2, it is possible to improve the heat transfer coefficient, and in conjunction with providing the grooves 11 in the flat tube 1, it is possible to significantly reduce the overall weight. .

[Brief explanation of the drawing]

Fig. 1 is a front explanatory view showing a general flat tube type evaporator, Fig. 2 is a front view showing an embodiment of the present invention, Fig. 3 A is a sectional view taken along line AA in Fig. 2, and Fig. 3 B is an enlarged view of the main part of Fig. A, Fig. 4 is a longitudinal sectional front view of one side of the coil in Fig. 2, and Fig. 5 A and B are sectional views taken along B-B and C-C in Fig. 4. , FIGS. 6A and 6B are cross-sectional views of the water-absorbing heat insulating material before it is inserted and assembled into the U-shaped reinforcing material, corresponding to FIG. 1...Flat tube, 11...Groove, 12...Reinforcement rib, 13...Bending radius portion, 2...Heat transfer fin, 21...Small hole, 3...Coil, 4...Water-absorbing heat insulating material , 41... Convex portion, 42... Concave portion, 43...
Ear part, 5... Reinforcement material, 6... Evaporator storage duct.

Claims (1)

[Scope of claims for utility model registration] (1) A flat tube bent in a zigzag shape,
In an evaporator consisting of heat transfer fins installed between the flat tubes, grooves with a nearly triangular cross-sectional shape and a depth approximately equal to the plate thickness of the flat tubes are formed on the outer surface of the flat tubes at the top and bottom of the reinforcing ribs. The heat transfer fins are formed in the longitudinal direction, and the heat transfer fins are provided with a large number of small holes smaller than the bending pitch of the heat transfer fins, with a perforation ratio within the range of approximately 12 to 18%, and the flat tubes and heat transfer fins are An evaporator characterized by having water-absorbing heat insulating material covering both sides. (2) The water-absorbing heat insulating material has a convex part where the end of the heat transfer fin comes into contact, a concave part into which the bent radius part of the flat tube fits, and an outside part that is inserted into the reinforcing material with a U-shaped cross section. Utility model registration claim 1, characterized in that the flat tube is bent by a reinforcing material and fitted into a recess, and has ears that cover the front and rear surfaces of the bent rounded part. Evaporator as described in Section.