JPH0415460A - Freezer device - Google Patents

Abstract

PURPOSE:To improve a defrosting efficiency by a method wherein a refrigerant storing device is communicated with an inlet port of an evaporator and the second bypassing circuit for communicating similarly a refrigerant circulation flow device with an outlet port of an evaporator as well as the first bypassing circuit having a solenoid valve is provided. CONSTITUTION:When a cooling operation is continued, a frosting state may occur at an evaporator 10. Under this condition, when a defrosting timer is operated, an operation of a compressor 3 is stopped and the first solenoid valve 8 and the second solenoid valve 11 are closed and then a circulation of the refrigerant in the freezing cycle is stopped. Concurrently, an electrical heater 7 for the refrigerant storing device 5 is electrically heated, the third solenoid valve 14 dispose din the first bypassing circuit and the fourth solenoid valve 16 disposed in the second bypassing circuit and opened. As a result, the refriger ant in the refrigerant 6 stored in the refrigerant storing device heated by the electrical heater 7 and boiled up by it passes from a connection port 5C into the evaporator 10 through the first bypassing circuit 13. The frosting in the evaporator is melted, cooled and liquified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a second refrigeration system aimed at improving defrosting efficiency.

[Conventional technology]

FIG. 3 is a perspective view showing a schematic configuration of an evaporator in a conventional refrigeration system. In this figure, (1) shows the evaporator main body consisting of a large number of plays 1 to fins (lΔ) and cooling pipes (IB) passing through these plays 1 to fins, and (2) shows the plate fins (lΔ) of the evaporator main body. IA) is a defroster installed in a state where heat can be exchanged.

If the refrigeration system including the evaporator configured in this manner continues to operate, frost will form on the evaporator body (1), and a defrosting timer (not shown) will operate to defrost the evaporator (1). 2) is energized, and the heat generated is caused by the fin (
IA) and the cooling pipe (IB) for defrosting.

[Invention or problem to be solved]

Conventional refrigeration equipment is constructed as shown below. Since the defrosting unit (2) is exposed to the air, some of the heat is transferred to the air inside the refrigerator, resulting in defrosting. In addition to being inefficient as it takes a long time to process, there is also the drawback of not having a negative impact on the stored items due to the rise in internal temperature.

The present invention was made to solve these problems, and aims to provide a refrigeration system that can defrost efficiently.

[Means to solve the problem]

The refrigeration apparatus according to the present invention includes a refrigerant reservoir having a built-in heating device for heating the refrigerant in the refrigeration cycle, and a first bypass that communicates the refrigerant reservoir with the inlet side of the evaporator and has a solenoid valve. The second bypass circuit also communicates the refrigerant reservoir with the outlet side of the evaporator.

[Effect]

According to this invention, when defrosting the evaporator, the circulation of the refrigerant in the refrigeration cycle is stopped, the heating device is operated to boil the refrigerant in the refrigerant reservoir, and the boiled refrigerant is passed through the first bypass circuit. Defrosting is performed by supplying the refrigerant to the evaporator, and the refrigerant that has been condensed by dissipating heat in the evaporator is returned to the refrigerant reservoir through the second bypass circuit.

Effective defrosting is achieved by repeating this cycle.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

In the figure, (3) is a compressor, (4) is a condenser, and (5)
is the refrigerant reservoir connection port (5Δ) (5B) (5G)
(5D), one of which (5A) is connected to the condenser (4).

(6) is a refrigerant stored in a refrigerant reservoir, and (7) is a heating device for heating the refrigerant provided in the refrigerant reservoir, and an electric heater or the like is used. (8) is the refrigerant reservoir connection port (5
B) the first solenoid valve connected to (9) the throttle device, α
0) is an evaporator, which is configured similarly to the evaporator main body (1) described above. (II) is a second solenoid valve. A refrigeration cycle (12) is constructed by sequentially connecting these as shown in FIG. Note that the first and second solenoid valves [8] (11) are opened during normal operation of the refrigeration cycle, and closed during defrosting of the evaporator. (1
3) is the first bypass circuit that connects the refrigerant reservoir connection port (5C) and the inlet side of the evaporator 00), and (14) is the first bypass circuit.
a third solenoid valve connected to the intermediate part of the bypass circuit;
During normal operation of the refrigeration cycle, the circuit is closed and the evaporator αO)
The circuit is opened during defrosting.

(15) is the refrigerant reservoir connection port (5D) and the evaporator 00)
(16) is a fourth solenoid valve connected to the middle part of the second bypass circuit, and like the third solenoid valve, the normal operation of the refrigeration cycle is It is sometimes closed and opened when the evaporator 00) is defrosted.

Next, the operation of this embodiment will be explained. In normal operation as a refrigeration system, high-temperature, high-pressure waste refrigerant discharged from the compressor (3) flows through the refrigeration cycle as shown by the solid arrow in the diagram, is condensed and liquefied in the condenser (4), and then connected Mouth (5
A) flows into the refrigerant reservoir (5).

After that, it flows out from the connection port (5B) and flows out from the first solenoid valve (8B).
), the pressure is reduced through the expansion device (9), and after being evaporated in the evaporator 00), it returns to the compressor (3).

If such cooling operation continues, frost will form on the evaporator QOI. In this state, when a defrost timer (not shown) set to a predetermined time operates, the operation of the compressor (3) is stopped and the first and second solenoid valves (8HI
]) is closed and the circulation of refrigerant in the refrigeration cycle is stopped.

At the same time, the electric heater ('71) of the refrigerant reservoir (5) is energized, and the third solenoid valve ('71) provided in the first bypass circuit is energized.
14) and the fourth solenoid valve (16) provided in the second bypass circuit are opened.

As a result, the refrigerant (6) in the refrigerant reservoir heated and boiled by the electric heater (power) passes from the connection port (5C) to the first bypass circuit (13) and evaporates, as shown by the dashed arrow in the figure. 00).

Inside the evaporator, the frost is melted, cooled and liquefied.

The liquefied refrigerant is transferred to the second bypass circuit (15) by gravity.
The refrigerant returns to the refrigerant reservoir (5) through the connection port (5D).

By repeating such circulation of the refrigerant, the evaporator is defrosted.

FIG. 2 is a refrigeration cycle diagram showing another embodiment of the present invention. In this figure, (17) is a check valve that is provided in the second bypass circuit and allows only the refrigerant to flow in the direction shown by the broken line arrow in the figure. By providing such a check valve, it is possible to prevent refrigerant from flowing into the evaporator QO from the refrigerant reservoir (5) via the second bypass circuit (15) during normal operation of the refrigeration system. The second bypass circuit (15)
This embodiment operates in the same manner as the embodiment shown in FIG. 1 without providing a solenoid valve.

Since the other configurations and functions are the same as those of the embodiment shown in FIG. 1, corresponding parts are given the same reference numerals and explanations will be omitted.

〔Effect of the invention〕

According to this invention, the refrigerant in the refrigerant reservoir is heated and supplied to the evaporator during defrosting.
In addition to being able to increase the defrosting efficiency, it also has the simplicity of the heater defrost method. Furthermore, since the heating device is built into the refrigerant reservoir, there is no adverse effect on stored items due to an increase in internal temperature.

[Brief explanation of the drawing]

Fig. 1 is a refrigeration cycle diagram showing one embodiment of the present invention, Fig. 2 is a refrigeration cycle diagram showing another embodiment of the invention, and Fig. 3 is a perspective view showing a schematic configuration of an evaporator in a conventional refrigeration system. It is a diagram. In the figure, (1) is the evaporator body, (1Δ) is the plate fin, (IB) is the cooling pipe, (2) is the defroster, (3) is the compressor, (4) is the condenser, ( 5) is a refrigerant reservoir, (7) is an electric heater, (9) is a throttle device, 00) is an evaporator, (1
3) is the first bypass circuit, (14) is the third solenoid valve,
(15) is a second bypass circuit, (16) is a fourth electromagnetic valve, and (17) is a check valve. In addition, in the figures, the same reference numerals indicate corresponding parts. Agent: Masuo Oiwa, patent attorney

Claims (1)

[Claims] A refrigeration cycle configured by sequentially connecting a compressor, a condenser, a refrigerant reservoir with a built-in heating device for heating the refrigerant, a first solenoid valve, a throttling device, an evaporator, and a second solenoid valve, and the refrigerant reservoir. a first bypass circuit that communicates between the refrigerant reservoir and the inlet side of the evaporator and has a third electromagnetic valve; a second bypass circuit that communicates the refrigerant reservoir and the outlet side of the evaporator;
A refrigeration system characterized in that, during defrosting of the evaporator, the first and second solenoid valves are closed, the third solenoid valve is opened, and the heating device is operated.