JPS5916699Y2 - Stacked evaporator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stacked evaporator, particularly one in which the liquid pipe itself is improved.

- Attach the product 1 type evaporator 1 (as shown in Figure 1) with the piece 2 as shown in Fig. A large number of these units are connected in an array, and corrugated fins 4 are interposed between the liquid pipe units.

That is, the piece 2 has bulges 5 and 6 at both ends, and these bulges 5 and 6 are connected by an intermediate member 7 having a flat U-shaped cross section perpendicular to the axis. If the center is aligned, liquid pools 8.9 will be created at both ends, and the liquid pools 8, 9 at both ends will be formed.
A liquid pipe unit 3 can be formed in which the liquid pipes 9 are connected through a flat liquid pipe 10.

A multilayer evaporator can be obtained by connecting a large number of the liquid reservoirs 8 and 9 of the unit 3 while communicating with each other through the through holes 11, and providing the corrugated fins 4 between the liquid pipes 10.

Inner fins 12 are provided in the liquid pipes 10 of the laminated evaporator 1 in order to increase heat transfer efficiency and improve pressure resistance.As is clear from FIG. 10 has a wave shape with a uniform pitch P in the cross section perpendicular to the axis.

In this evaporator, the liquid pipe 10 is vertically divided almost equally, so when the refrigerant rises in the liquid pipe 10 from the bottom to the top, the front side of the liquid pipe (the upper side of the air flow) The same flow rate of refrigerant always flows regardless of whether it is on the back side (the part on the downstream side of the air flow) or the back side (the part on the downstream side of the air flow).

Therefore, although the refrigerant flowing near the front side, where fresh, high-load air comes into contact, undergoes sufficient heat exchange and evaporates, and in some cases may become overheated and gas, the refrigerant flowing near the back side heats up. Because the exchanger's low-load air comes into contact with it, there is a situation where heat exchange is not sufficient.

Therefore, the present invention was made in order to eliminate such conventional drawbacks and obtain an evaporator with high heat exchange efficiency.
This is achieved by making the flow rate in the cross section perpendicular to the axis of the liquid tube different between the front side and the back side.

Next, the present invention will be explained with reference to the drawings.

What is shown in Fig. 4 is an evaporator (second,
The same members as in Fig. 3 are given the same reference numerals as 7),
The structure other than the liquid pipe 10 is the same as that of the heat exchanger described above, so a description thereof will be omitted.

The liquid pipe 10 is formed by press-molding the flat part 7a of the intermediate body 7 into a corrugated shape 13, and by aligning them in the middle, the heat transfer area of the liquid pipe 10 is increased from the upstream side 14 to the downstream side in the air flow direction. The side 15 is made larger to improve the heat exchange efficiency of the entire evaporator.

In other words, by reducing the refrigerant flow resistance on the front side of the liquid pipe 10 and increasing the same flow resistance on the back side, the flow of the refrigerant will be different between the front side and the back side, and heat exchange will be performed throughout the entire liquid pipe 10. In order to make it even, the flat part 7a of the intermediate body constituting the liquid pipe 10 is press-molded into a wave shape,
The pitch of this waveform is made coarser on the upstream side and denser on the downstream side.

In particular, in this embodiment, the wavy tips 13a are spaced apart so that they do not come into contact with each other.

In this way, when the heat load fluctuation of the air is large and the refrigerant flowing in the liquid pipe cannot follow it, the refrigerant on the downstream side 15 can be moved to the upstream side 14 through this interval. The condition of the refrigerant throughout the liquid pipe can be made uniform, and the heat exchange efficiency of the entire evaporator can be improved.

Next, the effect will be explained.

In Figs. 2 and 4, the refrigerant that has flowed into the liquid reservoir 9 is in the liquid pipe 1.
0 to the liquid reservoir 8.

In this case, with the conventional model, fresh air would come into contact with the front side, and heat-exchanged air would come into contact with the back side.
The refrigerant flowing on the front side evaporates well, but the refrigerant flowing on the back side does not exchange enough heat.

However, in the present invention, the liquid flow passage 17 of the liquid pipe 10
Since the flow resistance is different between the front side and the back side, a large amount of refrigerant flows on the front side, and a relatively small amount flows on the back side.

Therefore, in this evaporator, heat exchange is performed in substantially the same way between the front side and the back side of the liquid pipe 10.

In other words, by changing the flow rate of the refrigerant in response to changes in the heat load on the air side, the heat exchange rate of the entire evaporator is made homogeneous, preventing the risk of the refrigerant becoming overheated and gasified in a part as in the past, and ensuring uniformity throughout the entire evaporator. A heat exchange will take place.

Although the liquid pipe described above has a wavy side wall, the present invention is not limited to this in any way, and can be modified to various shapes such as an uneven shape or a triangular shape. .

As described above, according to the present invention, a waveform is formed in the cross section perpendicular to the axis of the intermediate body constituting the liquid pipe, and the waveform is formed so that the fluid flow resistance on the front side and the back side of the liquid pipe is different. By making the pitches different, sufficient heat exchange occurs only on the front side, where air with a high heat load is sufficiently exposed.
As a result, heat exchange is performed uniformly throughout the evaporator without using inner fins, and extremely excellent effects such as no part of the evaporator where the refrigerant is overheated and gasified are produced.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of pieces constituting a conventional laminated evaporator, Fig. 2 is a partially cutaway schematic front view of the same laminated evaporator, and Fig. 3 is a cross-sectional view taken along line III-III in Fig. 2. FIG. 4 is an axis-perpendicular cross-sectional view of the main part of the laminated evaporator according to the present invention, and FIG. 5 is a perspective view of pieces constituting the heat exchanger according to the present invention. 2... Piece, 3... Liquid pipe unit,
4...Fin, 5.6...Bulge, 7
...Intermediate, 8,9...Liquid pool, 1
0...Liquid pipe, 13...Waveform, 14...
...Upstream side, 15...Downstream side.

Claims (1)

[Scope of utility model registration request] By forming bulges at both ends of a thin plate and by aligning the pieces with a U-shaped cross section in the middle, the bulges at both ends become a liquid reservoir, and the intermediate body becomes a liquid reservoir. In a stacked evaporator in which a large number of liquid pipe units formed into liquid pipes communicating with each other are arranged and connected to each other via corrugated fins, the side walls of the flat liquid pipes are formed into a corrugated shape. The stacked evaporator is characterized in that the pitch of the air flow is coarse in the upstream region and dense in the downstream region.