JPH04155163A - Stacked evaporator - Google Patents

Abstract

PURPOSE:To improve the heat-exchange efficiency of the title evapolator, and to increase the cooling capacity thereof, by a method wherein at one part in which the dryness of a refrigerant is small, refrigerant pathways are formed so that a heat transfer area becomes larger, and the other part in which the dryness thereof is large, the refrigerant pathways are formed so that the refrigerant is well mixed. CONSTITUTION:Each tube element 1b for which insert fins 5 are held between tube plates 1a to be refrigerant pathways, or each tube element 1d for which two tube plates 1c wrought in the shape of irregularities are put together, and each corrugated fin 2 are alternately stacked, and thus the title evaporator is formed. The tube elements 1b are arranged on the side of an inlet pipe 3 for a refrigerant, and the tube elements 1d are arranged on the side of an outlet pipe 4 therefor. Since the tube elements 1b in which the insert fins 5 having a large heat transfer area are held for the refrigerant pathways, are located within the range of X, the efficiency of heat-exchange is made larger. On the other hand, although the dryness of the refrigerant on the downstream side is as large as nearly equal to one by evaporation, the deflected flow of the refrigerant is restrained since guides for mixing the refrigerant liquid and the refrigerant gaseous are formed. In ranging the whole of the part of Y, therefore, the heat-exchange between the refrigerant and air is equally performed, and thus the efficiency of the heat--exchanges is improved and the capacity of cooling is increased.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a stacked evaporator used in an air conditioner.

[Conventional technology]

The stacked evaporator has a tube plate 1 as shown in Figure 6.
．． Corrugated fin 2. It is composed of an inlet vibrator 3 and an outlet vibrator 4, and the liquid refrigerant flows through the plurality of tube plates 1 into which it flows from the inlet vibrator 3, exchanges heat with air, evaporates, and becomes a gas refrigerant. The structure is such that it flows out from Kabaib 4.

As seen in the conventional stacked evaporator and Japanese Patent Laid-Open No. 63-267868, a plurality of tube plates 1 having the same shape are used to form a refrigerant passage. on the other hand.

Since the refrigerant undergoes a phase change from liquid to gas inside the evaporator, its degree of freshness also changes from 0 to 1. When the degree of freshness is low, the heat transfer area in contact with the refrigerant is increased to promote evaporation, and when the degree of softness is greatly reduced, the refrigerant that is still in a liquid state is thoroughly mixed with the gaseous refrigerant to promote evaporation of the liquid refrigerant. The heat exchange efficiency of the evaporator is best achieved by promoting the flow of liquid refrigerant and preventing it from flowing into the flow path where only liquid refrigerant has a small resistance.However, in the conventional stacked evaporator Since all tube plates 1 have the same shape 1,
The shape of the refrigerant passage section is the greatest common divisor shape regardless of the degree of refrigerant flow, which has the disadvantage that the heat exchange efficiency of the evaporator cannot be improved and the cooling capacity cannot be increased.

[Problem to be solved by the invention]

The above-mentioned conventional technology has a problem in that the shape of the refrigerant passage is not suitable for changes in the degree of susceptibility of the refrigerant, and an improvement in cooling capacity cannot be expected.

An object of the present invention is to provide a stacked evaporator with increased cooling capacity.

[Means to solve the problem]

In order to achieve the above objective, the heat transfer area of the refrigerant passage in the part where the refrigerant's filtration degree C is small is increased, and the refrigerant passage is shaped so that the refrigerant in the part where its filtration degree is high mixes well. It is something.

Sulfur [Operation] Peng Increases the heat transfer area of the refrigerant passage in small parts where the refrigerant's sensitivity is close to 0. This increases the amount of heat exchange between the refrigerant and the hotter air stream, promoting evaporation of the liquid refrigerant. In addition, the refrigerant's sensitivity is 1
The large part of the refrigerant passage near the gas refrigerant has a structure that allows the liquid refrigerant to mix well with the gas refrigerant, making it easier for the liquid refrigerant to evaporate, and preventing the liquid refrigerant from being biased toward the liquid refrigerant, which has a lower density and lower flow resistance than the gas refrigerant. prevent the flow from occurring. As a result, the refrigerant evaporates efficiently inside the evaporator, and heat exchange with the air is also performed efficiently1, thereby improving the heat exchange efficiency of the evaporator and increasing the cooling capacity.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In FIG. 3, a tube unit 1b is shown in which insert fins 5 are inserted into the tube plate 1a to form a refrigerant flow path, and in FIG.

As shown in FIG. 1, a tube unit 1d consisting of a tube plate 1c whose portion corresponding to the refrigerant flow path is textured is stacked alternately with corrugated fins 2 to form an evaporator. Figure 2 shows a schematic diagram of the refrigerant flow inside the evaporator. The tube unit 1b is disposed closer to the inlet vibrator 3 of the refrigerant, and the tube unit 1d is disposed closer to the outlet vibrator 4 for assembly. That is, as shown in FIG. 2, the evaporator is divided into two parts, an upstream side X and a downstream side Y of the refrigerant, and the tube unit lb is placed in the X part and the tube unit lcl is placed in the Y part.

Since the upstream fragility of the refrigerant is small, close to 0, it is efficient to secure as much heat exchange with the air as possible.
Furthermore, since the refrigerant is a liquid, even if a member such as an insert fin is installed in the refrigerant passage to reduce the cross-sectional area of one passage by 4X, the increase in passage resistance is small. If the tube unit 1b in which the large insert fins 5 are provided in the refrigerant passage is provided in the range of X shown in FIG. 1, the heat exchange efficiency will be increased.

On the other hand, on the downstream side of the refrigerant, the degree of freshness is close to 1 due to evaporation, but gas refrigerant has a larger specific volume than liquid refrigerant, so the flow resistance is greater, and the refrigerant flow is filled with more liquid refrigerant, which has lower resistance. It tends to flow unevenly towards the aisles where the water is flowing. Therefore, if a guide is provided to mix the liquid refrigerant and gas refrigerant well in the refrigerant passage, drifting of the refrigerant can be suppressed.
The entire Y portion uniformly exchanges heat with the air, improving heat exchange efficiency and increasing cooling capacity.

FIG. 5 shows a second embodiment of the present invention. An insert fin 5a divided in the middle is inserted into a tube plate 1a to form a tube unit le. This tube unit 1e is provided at a portion Y shown in FIG. 1 where the refrigerant is highly sensitive.

Since the liquid refrigerant and the gas refrigerant are well mixed at the divided portions of the insert fins 5a, the heat exchange efficiency is improved and the cooling capacity is increased.

〔Effect of the invention〕

As explained above, according to the present invention, the heat transfer area is large in areas where the refrigerant's susceptibility is small, and the liquid refrigerant and gas refrigerant mix well in areas where the refrigerant's susceptibility is large, improving heat exchange efficiency. This has the effect of increasing cooling capacity.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the present invention, with Figure 1 being a front view of the evaporator, Figure 2 being a schematic diagram showing the flow of refrigerant, and Figures 3 and 4 showing the evaporator. FIG. 5 is a perspective view showing a second embodiment of the present invention, and FIG. 6 is a perspective view showing a conventional example. 1, la, lc... tube plate, 5, 5a insert fin, lb, ld, le... tube unit.

Claims (1)

[Claims] 1. A laminated type evaporator is produced by combining two tube plates to form a refrigerant passage to form a tube unit, and then assembling the tube unit and corrugated fins by stacking them alternately and brazing them together in a brazing furnace. 1. A stacked evaporator characterized in that insert fins are provided in a plurality of refrigerant passages in a portion of the refrigerant inlet nearer to the refrigerant inlet where the degree of refrigerant is small. 2. In the stacked evaporator according to claim 1, the plurality of refrigerant passages in the portion where the refrigerant is more sensitive near the refrigerant outlet portion are provided with uneven portions for good mixing of the liquid refrigerant and the liquid refrigerant. A stacked evaporator featuring: 3. In the stacked evaporator according to claim 1, the plurality of refrigerant passages in the portion where the refrigerant is more sensitive near the refrigerant outlet portion are provided with divided portions of the insert fins for good mixing of the liquid refrigerant and the liquid refrigerant. A stacked evaporator characterized by the following: