JPS603147B2 - Refrigeration equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refrigeration system such as an air conditioner or a chiller unit, and particularly relates to a condenser of a refrigeration system.

FIG. 1 shows a conventional condenser for refrigeration equipment.

This condenser forms a refrigeration system together with a compressor, a pressure reducing device, an evaporator, etc. (not shown). In Figure 1, 1
is a condenser, 2 is a gas side header, 3 is a liquid side header, 4a is an inlet pipe of the highest speed passage among multiple passages, 5a is an outlet pipe, 4n is the highest of multiple passages. The inlet pipe of the lower passage, 5n is the outlet pipe. Compressor (not shown)
The soot that exits the gas side is diverted to each cold soot passage at the header 2, condenses in the condenser 1, becomes supercooled liquid, and is sent to the liquid side header 3.
and flows to a pressure reducing device (not shown). When there is a height difference between each passage of the condenser 1 having the above structure, specifically, when there is a height difference of days (m) between the uppermost passage pipe 5a and the lowermost passage pipe 5n as shown in the figure, Due to this difference in height, the flow rate of cold soot to each passage becomes uneven, and the condenser 1 is not used effectively, resulting in an increase in condensing pressure and a decrease in cooling capacity. This phenomenon will be explained below. FIG. 2 is an explanatory diagram when it is assumed that the refrigerant flows uniformly through each passage due to the relationship between the length of the refrigerant passage and the refrigerant pressure. FIG. 2 shows the shark upper passage and the lowermost passage as representative examples. Since the refrigerant flow rate is the same in both the top passage 4a-5a (solid line) and the bottom passage 4n-5n (broken line), the cold soot pressure changes from the @ point to the ■ point in the condenser 1 due to pipe friction. It continues to decline.

The pressures at the outlet pipes 5a and 5n are indicated by points ``■'' and are the same, but if we focus on the ``■'' part in the liquid chamber 3 shown in FIG. (with the density of the lady k9')
The pressure in the drop stage passage increases by an amount corresponding to , and becomes the @ point shown in FIG. As a result, the pressure difference between the gas side header 2 and the liquid side header 3 at point 2 is different in each passage by the amount due to the liquid header, and therefore there is a problem that the refrigerant flow rate in the uppermost passage increases. Uniformity occurs. Figure 3 shows the relationship between the length of the slip passage and the pressure when the cold soot flow rate is uneven due to the previous cause, and Figure 4 shows the flow rate of each passage. . In Fig. 3, in the uppermost passage (solid line), the pressure drop due to pipe friction in the condenser 1 is large due to the large flow rate of cold soot, as shown by -■, and in the liquid side passage 3, the pressure drop is large. Hy
The pressure increases by the amount of time and reaches point ■. On the other hand, in the lower passageway (broken line), the flow rate of the refrigerant is small, and the pressure drop due to pipe friction in the condenser 1 is small, as shown by points ■-■ in FIG. In this case, as shown in FIG. 4, the flow rate of cold soot to each passage is highest in the uppermost stage, and decreases as the height of the passage decreases. When the refrigerant flow rate in the condenser decreases, liquid-cooled soot tends to accumulate, so liquid-cooled soot accumulates in the lowest passage, making it impossible to effectively utilize the heat transfer area. As a result, the condensation pressure increases and
This will lead to a decrease in cooling capacity and coefficient of performance. The purpose of the present invention is to
The purpose is to eliminate the deficiencies of the conventional technology and effectively use the heat transfer area of the condenser.

The structure of the present invention is characterized in that, in a condenser having a plurality of refrigerant passages, the length of each passage is formed to be sequentially longer toward the higher level. An embodiment of the present invention will be described based on FIG.

The figure shows a condenser, and the condenser 10 is formed so that the cold soot passage located at the top has a longer passage length. In the condenser 10 having the above configuration, each cold soot passage 11a passes from the tube 12 to the gas side through each inlet pipe 4a, 4b...4n of the soot passage.
, 11b...11n, the flow rate of the cold soot is determined by the liquid head H' applied to the head 13 on the liquid side of the condenser outlet.
As shown in FIG. 6, the uppermost passage 11a has the largest number of passages, and the lower cold soot passages 11n have fewer passages.

The soot flow rate is also affected by the passage length, heat exchange amount, etc.
Considering the above, the length of each refrigerant passage is appropriately selected. That is, by forming the upper reijo pilgrimage 11a to be longer, it is possible to design a condenser in which the cold soot temperature on the condenser outlet side of each cold soot passage becomes equal, as shown in Fig. 7. . As explained above, according to the present invention, in a condenser having a plurality of cooling passages, the refrigerant temperature at each condenser outlet becomes equal, and the entire condenser can be used effectively.
Therefore, it is possible to prevent an increase in condensing pressure, a lack of cooling capacity or heating capacity, and a decrease in the coefficient of performance.

[Brief explanation of the drawing]

Figure 1 is a structural diagram of a conventional condenser, Figures 2, 3, and 4.
FIG. 5 is a structural diagram of a condenser showing an embodiment of the present invention, and FIGS. 6 and 7 are explanatory diagrams of the operation of the condenser shown in FIG. 5. 4a, 4b, 4n...Inlet pipe of cold soot passage, 5a, 5
b, 5n...Exit pipe of cold treatment passage, 10...
Condenser, 11a, 11b, 11n...refrigerant passage, 12...gas side header, 13...liquid side header. Ta'tu younger brother Z figure wo style 4th hair ``wo skin l Tsutomu et al side grandson wa figure

Claims (1)

[Claims] 1 A compressor, a condenser, a pressure reducing device, and an evaporator are sequentially connected via piping to form a refrigerant circuit, and a plurality of refrigerant passages for the condenser are formed, and the length of each refrigerant passage is set so that the passage points toward a higher position. A refrigeration device characterized in that the length is sequentially increased according to the following.