JPS6250743B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a heat exchanger for an air conditioner using Freon refrigerant or the like, and is intended to improve the performance.

[Background of the invention]

In the conventional heat exchanger of this kind, as shown in FIG. 1, the pipe 1 of the heat exchanger has the same inner diameter from the inlet to the outlet in order to facilitate manufacturing. In such a structure, the refrigerant flow rate changes by 10:1 or more while the refrigerant is gasified or liquefied, and the heat transfer coefficient on the refrigerant side differs between the inlet side and the outlet side (approximately 2:1).
Therefore, the amount of heat exchanged between them becomes non-uniform, resulting in a decrease in performance.

[Purpose of the invention]

The present invention eliminates the above drawbacks.

[Summary of the invention]

That is, an improvement was made by inserting bars with different diameters into the pipe in order to change the flow rate of the refrigerant depending on the refrigerant condition.

[Embodiments of the invention]

Hereinafter, a second embodiment of the present invention will be explained using a condenser as an example.
This will be explained with reference to FIG. 3 is a fin, 4 is a refrigerant pipe, 5 is an inlet, 6 is an outlet, 7 is a pipe 4
It is a bar inserted inside, and its end face 8 is tapered so as to narrow the refrigerant flow area of the pipe 4 toward the outlet 6 side, and its outer diameter gradually increases. At the same time, as shown in the figure, an outlet 6 with a large amount of liquid component
The bar 7 inserted into the pipe 4 on the side has a larger outer diameter.

According to this structure, on the inlet 5 side, the refrigerant is at a high temperature and there is a temperature difference, so the amount of heat exchange is large, but the flow rate is also high on the outlet 6 side, so the refrigerant flow rate is increased, so the amount of heat exchange is large. It will be done. In this case, the pressure loss of the refrigerant is conventional, and the liquid area on the outlet 6 side is about 1/10 of the gas area on the inlet 5 side, so even if the cross-sectional area is reduced to 1/2, the refrigerant pressure There is almost no effect of increased loss, and on the contrary, it can be considered that there is no loss at all because the flow sufficiently fills the inner wall of the pipe. The end face of the bar 7 is tapered, which not only rectifies the flow and prevents an increase in pressure loss but also prevents the generation of noise from turbulence of the refrigerant. Alternatively, the bar 7 is provided on the straight part of the refrigerant pipe 4 to facilitate insertion, processing, etc., and to prevent it from being vibrated by the refrigerant, the bar 7 is easily provided with fins made of plastic so that it can be easily inserted and supported. It is set as.

FIG. 4 shows another embodiment, in which a metal object such as a ready-made copper pipe or aluminum pipe is assumed, and a plurality of hollow bars 9 with different finishing diameters are formed with both ends blind.
10 and 11 are arranged with the diameter increasing in stages toward the outlet 6 side, and in addition to obtaining the same effect as shown in FIG. 2, it also has the feature that it can be easily realized with a ready-made pipe. In addition to the above-mentioned performance improvement effect, this embodiment reduces the internal volume of the refrigerant pipe by using a blind bar, which reduces the amount of refrigerant required. The ripple effect is extremely large, as it can also prevent

〔Effect of the invention〕

As explained above, according to the present invention, a bar is inserted inside the refrigerant pipe, the outer diameter of which increases in the direction in which the liquid component increases, and the outer diameter of which increases as the liquid component increases. In addition to finely increasing the heat transfer coefficient on the refrigerant side and achieving uniform high performance throughout the heat exchanger, it also reduces the amount of refrigerant and prevents compressor lock-up accidents due to lack of refrigerating machine oil. You can get an exchanger.

[Brief explanation of the drawing]

Figure 1 is a schematic front sectional view of a conventional heat exchanger;
The figure is a schematic front sectional view of the heat exchanger of the present invention, FIG. 3 is a sectional view taken along the line AA in FIG. 2, and FIG. 4 is a schematic front sectional view of a heat exchanger showing another embodiment of the present invention. FIG. 5 is a sectional view taken along line BB in FIG. 4. 3... Fin, 4... Refrigerant pipe, 5... Inlet, 6... Outlet, 7... Bar, 8... End face, 9,
10,11...bar.

Claims (1)

[Claims] 1 Comprising a plurality of pipes with the same inner diameter and a bar inserted into a liquid region of a refrigerant flowing inside the pipe, the bar is tapered so that the outer diameter increases in the direction in which the liquid component in the liquid region increases. A heat exchanger for an air conditioner, wherein the bar has an outer diameter larger in the pipe where the liquid component is larger.