JPS5871A - Refrigerating cycle - 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 refrigeration cycle for performing cooling operation such as a refrigerator-freezer. In general, in equipment such as refrigerators, where the refrigeration compressor is composed of a compressor, condenser, capillary tube, cooler, suction pipe, etc. and operates intermittently depending on the temperature, it is necessary to stop the compressor. The high-temperature refrigerant on the high-pressure side flows through the capillary into the cooler, which had been at a low temperature due to cooling operation, in order to balance the pressures on the Shimada side and the low-pressure side. In this case, the high temperature gas refrigerant on the joint pressure side flows into the cooler, is cooled, and is condensed to become a liquid refrigerant. In other words, the condensation heat load is placed on the cooler installed inside the insulated equipment, and since the refrigerant in the high-pressure system decreases during that time, it is necessary to cool down the next compressor operation. This has the disadvantage that the start-up of the refrigerant supply to the container is delayed. In particular, the former condensation heat load increases as the ambient temperature rises, and the latter delay in the start-up of refrigerant supply to the cooler becomes more noticeable as the ambient temperature and discharge pressure decrease, both of which lead to a decrease in cooling efficiency. This is a contributing factor.

The present invention has been made to solve these drawbacks, and one embodiment thereof will be described below with reference to the drawings.

FIG. 1 shows a refrigeration cycle comprised of a compressor 1, a condenser 2, a capillary tube 3, a cooler 4 and a suction pipe 5 in a refrigerator (not shown). A refrigerant flow control valve 6 is located at the outlet of the condenser 2.
has been set up.

FIG. 2 shows a schematic cross-sectional view of the refrigerant flow control valve 6. At the end of the casing of this control valve 6 are refrigerant inlet and outlet pipes 8, 9 (
In the refrigerant circuit inside the casing 7, there is a bellows 10 (sensing part) sealed with a gas having a large coefficient of thermal expansion so as to expand and contract depending on the temperature of the refrigerant. A needle pin 12 is disposed via a spring 13 so as to come into contact with the bellows 10, and the needle pin 12 contacts a valve seat 11 formed to open and close a refrigerant circuit in the casing. Reference numeral 14 denotes a stopper that comes into contact with the top surface of the needle pin 12. When these are in contact (when the spring 13 is fully compressed), the bellows 10 adjusts the length of the needle pin 12 so that the valve seat 11 does not block the passage 11'. The height of the stopper 14 is set.

Next, the operation of the refrigeration cycle will be explained. When the compressor 1 operates, high-temperature refrigerant is fed into the condenser 2, the inner bellows in the control valve e rises, the needle pin 12 is pushed up by the spring 13, and a normal refrigeration cycle is performed.

When the compressor 1 stops, the supply of high-temperature gas refrigerant to the condenser 2 is stopped, and the gas temperature in the condenser rapidly decreases due to the ambient temperature, and the internal pressure of the bellows 1o in the control valve 6 also decreases. 10 contracts and is pressed by the spring 13, and the needle pin 12 seals the refrigerant circuit in the control valve 6 with the valve seat 11 of the casing 7, thereby preventing the high-temperature refrigerant from flowing into the cooler 4 on the high-pressure side. to be sealed. As a result of these control valve operations, when the compressor 1 is stopped, the amount of condensation heat load to the inside of the refrigerator due to the flow of high-temperature gas refrigerant in the condenser 2 into the cooler side is reduced, and the cooling while the compressor 1 is stopped is reduced. The temperature rise in container 4 is now kept well below the internal temperature, and the refrigerant remaining on the high-pressure side approaches the room temperature where the refrigerator is installed during the stoppage, and the pressure decreases, but the refrigerant remains at a level higher than that of the conventional refrigeration cycle. Since a large amount of refrigerant is retained on the high pressure side, the rising speed of refrigerant circulation to the cooler 4 becomes faster when the compressor 1 is next started. In particular, when the ambient temperature drops, the capacity of the condenser 2 becomes excessive, and more refrigerant is converted into liquid refrigerant in the condenser 2 during operation of the compressor 1, so this effect becomes even greater.

In addition, in the refrigeration cycle shown in FIG. 1 in which the control valve 6 is installed, when the cooler 4 is defrosted by a heater (not shown), the air is also supplied to the cooler 4 during defrosting (while the compressor is stopped). Since the refrigerant inflow is stopped, the heat capacity in the cooling @ 44 is reduced, and the defrost time is also shortened.

Furthermore, a temperature-sensitive capillary tube (indicated by the broken line 10' in FIG.
Needless to say, if it is arranged in the compressor body, condenser inlet, etc., the bellows action will be faster and the effects of the present invention will be further enhanced.

As explained above, the present invention has all the refrigerant flow control valves installed at the condenser outlet of the refrigeration cycle that open and close by detecting changes in the refrigerant temperature in the condenser or the temperature of high-pressure side equipment, thereby reducing the high temperature when the compressor is stopped. It is possible to improve the efficiency of the refrigeration cycle by preventing the intrusion of condensation heat load due to the inflow of gas refrigerant into the cooler and by accelerating the start-up speed of refrigerant circulation during the next compressor operation.
Furthermore, since the control valve operates based on temperature, it consumes less power than a control valve that requires electrical elements such as a solenoid valve.

[Brief explanation of drawings]

FIG. 1 shows a refrigeration cycle diagram according to an embodiment of the present invention, and FIG. 2 shows a sectional view of a refrigerant flow control valve. 6.--Refrigerant flow control valve, 1o...Bellows (sensing section).

Claims (1)

[Claims] In a refrigeration cycle consisting of a compressor, a condenser, a capillary tube, a cooler, a suction pipe, etc., in which the temperature is controlled by intermittent operation of the compressor, there is a condensed refrigerant at the outlet of the condenser when the compressor is in operation and when it is stopped. A refrigerant flow control valve is installed that operates by directly detecting temperature changes or high-pressure side equipment temperature changes with a sensor, and this control valve is closed when the compressor is stopped and opened when the compressor is running. Features a refrigeration cycle.