JPS592456Y2 - Stacked refrigerant evaporator - Google Patents

Description

[Detailed description of the invention] The present invention relates to a stacked refrigerant evaporator used in automobile air conditioners, etc., and is designed to efficiently discharge condensed water in an evaporator of the type in which refrigerant flows in the left and right direction. This is the purpose.

As shown in FIGS. 1 and 2, a conventional stacked refrigerant evaporator includes a tube element 1 in which a pair of dish-shaped tube plates 1a and 1a are joined facing each other, and a flat thin plate bent into a bellows shape. A large number of corrugated fins 2 are alternately stacked, and the ends of the tube elements 1 are connected and positioned at the upper and lower ends to form a lower refrigerant inlet tank 3 and an upper refrigerant outlet tank 4.

5 is a refrigerant introduction pipe connected to the refrigerant inlet tank 3;
is a refrigerant discharge pipe connected to the refrigerant outlet tank 4.

As shown in FIG. 2, the ends of the tube element 1 have ribs lc, lc formed on the outside of the mating surfaces 1b of the tube plates 1a, la.

The ribs 1c, 1c are expanded at their outer ends so as to contact the corrugated fins 2, respectively.

The stacked refrigerant evaporator with the above configuration allows air to flow from the direction shown by the arrow X in FIG. 2, and evaporates from the bottom to the top inside the tube element 1 while exchanging heat with the flowing refrigerant to cool the circulating air. .

At this time, moisture in the air condenses and becomes water droplets, which adhere to the surface of the tube element 1 or the surface of the corrugated fins 2, but are blown away by the circulating air and the surfaces of the tube element 1 and the corrugated fins 2 are placed on the leeward side (
(in Fig. 2, from the bottom to the top of the paper), and at the leeward end part of the mating surface 1b and the corrugated fin 2
It flows downward from the space 7 between them, and the others are blown away from the ribs 1C and the ends of the corrugated fins 2 to the leeward side.

However, in a stacked refrigerant evaporator in which the tube elements 1 are arranged horizontally, the above-mentioned space 7 is located in the horizontal direction, so when draining condensed water, water droplets are caused by surface tension to flow to the ends of the ribs 1C and corrugated fins 2. It is difficult to separate from the air conditioner, resulting in a decrease in cooling performance.

The present invention was developed for the above-mentioned reasons. A large number of tube elements and corrugated fins are alternately stacked, and both ends of the tube elements are communicated with each other to form a refrigerant inlet tank and a refrigerant outlet tank. In a stacked refrigerant evaporator arranged in such a manner, drainage of condensed water is improved by making the downstream end of the air flow of the tube element a flat adhesive surface that does not come into contact with the corrugated fins.

The embodiment will be described in detail below according to the drawings. In FIGS. 3 to 5, the tube elements 1 and corrugated fins 2 are stacked alternately, and the cube elements 1 are arranged horizontally, and refrigerant artificial tanks are provided at both left and right ends. 3 and a refrigerant outlet tank 4 are provided.

As shown in FIG. 4, the tube plate 1a of the tube element 1 is provided with an adhesive surface 1d on one side edge of which the mating surface extends to the rib portion.

The side edge where the rib 1C is formed is located on the upstream side of the air flow so that air can flow from the direction of the arrow Y as shown in FIG. It is arranged so that the side edge on which the adhesive surface 1d is formed is located on the downstream side of the air flow.

In the stacked refrigerant evaporator having the above configuration, the tube element 1
The condensed water droplets adhering to the upper surface and the surface of the corrugated fin 2 are blown away by the circulating air, flowed from the upstream side to the downstream side (from the left side to the right side in Figure 5), and dripped from the downstream end. do.

As described above, the present invention consists of alternately stacking tube elements 1 in which tube sheets 1a and la are joined together and corrugated fins 2, and arranging the tube elements 1 horizontally, with refrigerant artificial tanks 3 at the left and right ends. In a stacked refrigerant evaporator in which a refrigerant outlet tank 4 is formed, the downstream end of the air flow of the tube element 1 is a flat adhesive surface 1d,
Since it is configured so that it does not come into contact with the corrugated fin 2,
Droplets of condensed water adhering to the upper surface of the tube element 1 or the surface of the corrugated fin 2 flow downstream due to the circulating air, and the air flow is increased from the flat adhesive surface 1d by enlarging the air flow path. Since the flow velocity decreases, water droplets on the tube element 1 drip from the adhesive surface 1d without scattering to the downstream side of the air flow.
In the stacked refrigerant evaporator configured as described above, condensed water is smoothly discharged, and a decrease in cooling efficiency can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional stacked refrigerant evaporator, and FIG. 2 is a view taken along the line A--A in FIG. 3 is a plan view of the stacked refrigerant evaporator of the present invention, FIG. 4 is an enlarged perspective view of the main part of the tube plate, and FIG. 5 is a view taken along the line B--B in FIG. 3. 1a: tube plate, 1b: mating surface, 1C: rib, 1d: joint surface, 1: tube element, 2 Nicol gate fin, 3
: Refrigerant inlet tank, 4: Refrigerant outlet tank.

Claims (1)

[Scope of utility model registration request] A large number of tube elements 1 and corrugated fins 2 are stacked alternately, and both ends of the tube element 1 are communicated with each other to form a refrigerant inlet tank 3 and a refrigerant outlet tank 4, and the tube element 1 is arranged horizontally. A stacked refrigerant evaporator characterized in that the end of the tube element 1 on the downstream side of the air flow is a flat adhesive surface 1d that does not come into contact with the corrugated fins 2.