JPH0328275Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention is an evaporator that is incorporated into an automobile air conditioner and used to cool air blown into a vehicle interior. This invention relates to improvements to the heat transfer fins.

(Prior Art) As shown in FIG. 1, an evaporator used in an air conditioner for an automobile is a corrugated heat transfer fin 2 in which a strip-shaped thin metal plate is formed in a zigzag pattern between meandering flat irregularly shaped tubes 1. , 2 sandwiched between each other, or as shown in FIG. , 3 with similar heat transfer fins 2, 2 sandwiched between flat tube parts 4, 4, etc. are used.

In the evaporator configured in this way, the liquid refrigerant flowing from the inlet pipe 5 into the irregularly shaped pipe 1 or the liquid pipe element 3 (hereinafter collectively referred to as the refrigerant pipe H) interacts with the air passing between the fins 2 and 2. exchange heat,
The air is cooled, and water vapor contained in the air condenses and adheres to the surfaces of the heat transfer fins 2, 2. A large amount of this condensed water is generated on the leeward side of the fins 2 where the air temperature is lower, and is pushed by the air flow in the fins 2 and moves to the leeward side end of the fins 2.
That is, the condensed water w mainly accumulates on the curved part 6 of the heat transfer fin 2 as shown in FIG. 3, and is pushed by the air flow and flows along the refrigerant pipe H as shown in FIG. flow and move to the leeward end.

On the other hand, as shown by arrow A in FIG. 4, this air flow has a high flow velocity and a large amount of air in the central part where the resistance is lowest, but there is less air flow in the vicinity of the refrigerant pipe H where the flow resistance is large. If condensed water adheres to areas where there is little air flow, the areas where heat exchange efficiency should be the highest will have the lowest heat exchange efficiency, and the evaporator will not be able to provide sufficient cooling capacity.

Therefore _, as shown in FIG.
r ₂ ) is cut and raised, and the condensed water w flowing on the flat plate part 7 through the through hole 8 created by this cut and raised is allowed to fall before reaching the leeward end. This prevents water from splashing from the outside and increases heat exchange efficiency.

However, even if the condensed water w flowing through the flat plate part 7 falls from the through hole 8, the condensed water w flowing along the both sides of the flat plate part 7 will flow along the inside or outside of the curved part 6 as described above. , there is a risk of water splashing from the leeward end.

(Problem to be solved by the invention) Therefore, in order to prevent splashing water, conventional methods have been used, such as those in which the louver r is cut up closer to the refrigerant pipe (see Fig. 6), or the leeward end 2a of the heat transfer fin 2 is tilted at an angle. In the case of a stacked evaporator shown in Fig. 7, there is a notch that allows the condensed water to fall vertically through the refrigerant pipe H, etc. (see Fig. 7 A and B). For ease of molding, a tub part 9 is formed at the leeward end, and the condensed water flows through this tub part 9.
Although various proposals have been made to allow water to flow down in the vertical direction, the current situation is that there are few that reliably prevent water from flying away.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide an evaporator that reliably prevents condensed water from flying to the leeward side.

[Structure of the invention] (Means for solving the problem) In order to achieve the above object, the present invention includes a plurality of flat plate parts arranged parallel to each other with respect to the air flow between the refrigerant pipes through which the refrigerant flows inside. In the evaporator having a heat transfer fin interposed therein, a raised portion consisting of a wall portion that gradually expands from the upstream side to the downstream side is formed at the downstream end portion of the flat plate portion in the air flow direction. This is an evaporator.

Preferably, the heat transfer fins are formed by cutting and raising a large number of louvers on a flat plate portion.

It is preferable that the heat transfer fin has a drainage port at a position adjacent to the refrigerant pipe on the side of the raised abutment part.

(Function) In this way, by forming an abutment portion consisting of a wall portion that gradually expands downstream from approximately the center of the downstream end portion of the heat transfer fin in the air flow direction, the central portion through which a large amount of air flows can be formed. The airflow is deflected to the side by the raised part located at the top of the refrigerant pipe, making it possible to collide with the side of the refrigerant pipe where a large amount of water droplets are flowing, improving heat exchange performance due to the deflection. In addition, the amount of condensed water that flies to the leeward side from the downstream end of the heat transfer fins is extremely reduced, and water droplets on the fins flow through the refrigerant pipes, so water does not drain from the downstream end of the fins. Sex also improves.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 8 is a perspective view showing the main parts of the evaporator according to the present invention, FIG. 9 is a sectional view of the main parts of FIG. 8, and FIG.
The figure is a front view showing the main parts of FIG.
The same members as those shown in the figures are designated by the same reference numerals.

The evaporator 10 of this embodiment is a deformed tube evaporator similar to that shown in FIG. The louver R is cut out.

The louver R is cut and raised on the flat plate part 7 with a substantially uniform width l, and approximately the front half of the heat transfer fin 2 is cut and raised from the louver R that is inclined downward with respect to the air flow direction. The louver R following this is inclined upward with respect to the air flow direction.

Particularly in this embodiment, the raised part 1 that deflects the air flow of the flat plate part 7 of the heat transfer fin 2 to the side
1 is formed. This raised part 11 is the flat plate part 7
The wall portion 12 is formed by a predetermined length S from the downstream end of the flat plate portion 7 and gradually expands toward the downstream side from approximately the center of the downstream end portion of the flat plate portion 7 in the air flow direction. It is preferable that the height h of the wall portion 12 gradually increases toward the downstream side, but the formation of the wall portion 12 does not necessarily start from the center of the flat plate portion 7, but rather at a position slightly shifted from the center of the flat plate portion 7. You may start from

If such a wall portion 12 is formed, water droplets and airflow flowing down on the flat plate portion 7 will be deflected to the sides by the wall portion 12. For example, as shown in FIG. Even when a large amount of air is flowing, the airflow is deflected to the side as shown by the arrow, and the airflow collides with the side of the refrigerant pipe H, where a large amount of water droplets are flowing. Become. This not only further prevents water from flying away from the central part of the flat plate part 7, but also allows the air flow to wash away condensed water, allowing the drain port 13 provided on the side of the heat transfer fin 2 to
You can also drop water through it.

In addition, the drain port 13 is located on the side of the abutment part 11 in order to drain the water diverted by the abutment part 11 and the condensed water that has flowed down along the refrigerant pipe H. It is preferable to open it at a position adjacent to the refrigerant pipe H.

The abutment raised portion 11 can be easily formed by the following method.

Recent heat transfer fins are extremely thin, about 0.5 to 0.6 mm thick, and are made of soft materials such as aluminum plates, so they can be easily cut with a regular cutter knife. Therefore, with the evaporator molded and the heat transfer fins 2 fixed to the refrigerant pipes H,
If the cutter knife is cut upward from the bottom, the fins 2 will be pushed up by the cutter knife and will rise upwards, making it easy to form a shape that directs water droplets, etc. that would otherwise flow downwind to the side. .

Moreover, when such a cutting method is used, the raised part 11 formed by the cut is low on the windward side and high on the leeward side,
The shape is extremely convenient for drainage.

Further, the downstream end of the heat transfer fin 2 is shaped to direct the airflow upward, so that it can be used, for example, in a cooler unit 1 of an automobile air conditioner as shown in FIG.
4, in the case where the outlet is opened slightly above the casing (this is to prevent condensed water from easily scattering from the outlet 15 to the leeward side), the air flow is controlled by the heat transfer fins 2. Since the air is naturally directed toward the outlet 15 side, there is no risk that the air flow resistance in the evaporator will increase.

Although the embodiments described above relate to a deformed tube evaporator, the present invention is not limited thereto, and can also be applied to a laminated type evaporator. In particular, in a laminated type evaporator, if a gutter is formed at the downstream end of the air flow and the condensed water falls along the gutter, an evaporator with even higher water splash prevention effect can be obtained.

(Effects of the invention) As described above, according to the invention, the flat plate part of the heat transfer fin incorporated in the evaporator is provided with a raised part that deflects the air flow downward to the side at the downstream end portion in the air flow direction. As a result, the airflow can be deflected to the side, ensuring contact between the air and the refrigerant pipes, improving heat exchange efficiency, and condensed water flying to the leeward side from the downstream end of the heat transfer fins. It becomes extremely small. Particularly in the abutment part, condensed water is pushed to the side, and water droplets on the fins flow through the refrigerant pipes, which improves water drainage from the downstream end of the fins.

[Brief explanation of the drawing]

Figures 1 and 2 are schematic front views illustrating conventional evaporators, Figure 3 is an enlarged front view of the main parts of Figure 1, Figure 4 is a sectional view taken along the - line in Figure 3, and Figure 5 is a front view of a conventional evaporator. 4 is a cross-sectional view taken along the - line in FIG.
Figures A and B are schematic sectional views showing other conventional examples;
The figure is a perspective view of a main part showing an embodiment of the present invention, FIG. 9 is a cross-sectional equivalent view showing a horizontal cross-section of FIG. 8, FIG. 10 is a schematic front view of FIG. 8, and FIG. 1 is a sectional view of a cooler unit incorporating an evaporator according to the present invention. 2... Heat transfer fin, 7... Flat plate part, 10... Evaporator, 11... Raised part, 12... Wall part, 13... Drain port, R... Louver.

Claims (1)

[Claims for Utility Model Registration] (1) In an evaporator in which a heat transfer fin having a plurality of flat plate parts parallel to each other with respect to the air flow is interposed between refrigerant pipes through which refrigerant passes, What is claimed is: 1. An evaporator characterized in that an evaporator is formed at a downstream end in an air flow direction with an abutment portion consisting of a wall portion that gradually expands from the upstream side to the downstream side. (2) The evaporator according to claim 1, wherein the heat transfer fins are formed by cutting and raising a large number of louvers from the flat plate portion. (3) Utility model registration claim 1, characterized in that the heat transfer fin has a drainage port at a position adjacent to the refrigerant pipe on the side of the raised part.
Item 2 is the evaporator described in Item 2.