JPS58130968A - Refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vapor compression type refrigeration system that utilizes the latent heat of a refrigerant, and is particularly concerned with flow rate control of the refrigerant. Figure 1 shows the refrigerant cycle of a conventional refrigeration system. An example is shown in Figure 1, (11 is a compressor, (2) is a condenser, (3) is a heat exchanger disposed at the bottom of the accumulator (6), (4) is a capillary tube, 15 ) is an evaporator, and to+ is an accumulator (1), which are connected in sequence to constitute a refrigeration system.

In such a conventional refrigeration system, the refrigerant gas that has become high temperature and high strength in the compressor +11 is cooled and liquefied in the condenser (21), and then transferred to the accumulator (6) in the heat exchanger (13).
After exchanging heat with the refrigerant liquid stored in the heat exchanger (31) and increasing the supercooling of the refrigerant liquid in the heat exchanger (31), the cabillary tube (4
) is reduced in temperature and pressure, and is led to the evaporator 15). When the refrigerant liquid is gasified in the evaporator 15), it absorbs heat from the surroundings and performs freezing.

Thereafter, the refrigerant exchanges heat with the refrigerant liquid in the heat exchanger (3), becomes completely gasified, and is sucked into the compressor (1).

By the way, as the degree of subcooling of the inlet refrigerant liquid increases, the flow rate of the refrigerant increases, and as the degree of subcooling decreases, the flow rate of the refrigerant decreases. This characteristic plays an important role in maintaining the appropriate refrigerant flow rate in the refrigeration system.In other words, when the evaporation temperature falls and the required refrigerant flow rate decreases, the degree of supercooling decreases, reducing the refrigerant flow rate, and conversely evaporates. When the temperature rises, the degree of subcooling increases and the refrigerant flow rate is increased to try to maintain a proper refrigerant flow rate.

However, in the refrigeration system shown in Figure 41, the refrigerant liquid at the outlet of the condenser 12) is cooled by the heat exchanger (3), so as the evaporation temperature decreases, the degree of supercooling increases, and the evaporation rate increases. The degree of supercooling tends to decrease as the temperature rises, and the refrigerant flow rate cannot be maintained properly, causing liquid to return to the compressor fi+, or causing the condenser (2) (two liquids accumulate and high pressure rises). This caused problems such as overloading.

This invention was made in order to eliminate one drawback of the conventional ones as described above, and by providing a bypass flow path connecting the condenser outlet and the evaporator inlet, and flowing a part of the refrigerant liquid therein, It is an object of the present invention to provide a refrigeration system that can always maintain an appropriate flow rate of refrigerant to an evaporator.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows the configuration of one embodiment, and the same reference numerals as in FIG. 1 indicate the same or corresponding parts, so the explanation thereof will be omitted. In Figure 2, (30) is the condenser outlet pipe provided at the outlet of the condenser (21), (31) is the evaporator inlet pipe, (1!31211 is the condenser outlet pipe (30) and the evaporator inlet pipe) Bypass flow path connecting (31), jη
In the refrigeration system configured as described above, is a pressure reducing device provided in the bypass flow path.

A part of the refrigerant liquid at the outlet of the condenser (2) is led to the heat exchanger (3), similar to the conventional device, to completely gasify the refrigerant sucked into the compression fill+, and this heat exchange increases the degree of supercooling. increases and is guided to the capillary tube (41). On the other hand, the refrigerant liquid at the outlet of the other condenser (2) maintains the degree of supercooling at the outlet of the condenser 121, and passes through the bypass pipe σ to the decompression device. In a cooling device with such a configuration,
The effects of supercooling of the refrigerant liquid flowing through the heat exchanger (3) to the capillary tube (4) can be alleviated.1. It is possible to eliminate the problems that occurred with conventional refrigeration equipment. That is, when the evaporation temperature becomes high, the degree of supercooling increases, and when the 1A humidity temperature becomes low, the degree of supercooling decreases.

Appropriate refrigerant flow rate can be maintained at all times.

Note that the pressure reducing device may include a valve with a fenestrated throttle;
Alternatively, the opening may be changed using a system signal, such as an electric expansion valve.

Furthermore, if a capillary tube is used as the pressure reducing device, a similar effect can be achieved with an inexpensive device.

Although the above example shows a simple refrigeration device,
In addition to this type of refrigeration system, it can also be applied to other refrigeration cycles such as heat pump cycles, multistage refrigeration cycles, and multistage cascade refrigeration cycles, as well as those equipped with auxiliary equipment such as oil separators, dryers, and accumulators. It has a similar effect.

As described above, according to the present invention 1, by alleviating the influence of supercooling of the refrigerant at the entrance of the capillary tube, the optimal refrigerant flow rate can be maintained at all times in response to changes in the operating conditions of the refrigeration equipment, resulting in high reliability. This has the effect of providing a refrigeration system with good performance.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional refrigeration system, and FIG. 2 is a block diagram showing an embodiment of the present invention. In the figure, (1) is a compressor, (2) is a condenser, (3:
is a heat exchanger, (4) is a capillary tube, and (5) is an evaporator. 16+ is an accumulator, , 19. f21) is a bypass pipe, and @ is a pressure reducing device. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno - Figure 1 2 Figure 2 procedural amendment (voluntary) April 6, 1932 2, Title of invention Refrigeration device 3, Person making the amendment (1) S, @ Original target drawing 6, Contents of the amendment Figure 2 of the drawing will be corrected as shown in the attached sheet. Figure 2 above

Claims (1)

[Scope of Claims] A refrigeration system comprising a fi+ compressor, a condenser, a heat exchanger with the refrigerant sucked into the compressor, a capillary tube, and an evaporator connected in sequence, wherein an outlet of the condenser and an inlet of the evaporator are connected in sequence. 1. A refrigeration system characterized by having a bypass flow path connecting the refrigeration system and the bypass flow path, the bypass flow path being equipped with a pressure reducing device. (2) The refrigeration device according to claim 1, wherein the pressure reducing device is a capillary tube.