JPH102640A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent return of liquid refrigerant to a compressor by providing a liquid level sensor for sensing a liquid level height in an accumulator, providing a hot gas bypass circuit for introducing hot gas discharged from the compressor into the accumulator, and inserting a solenoid valve into the circuit. SOLUTION: When a compressor 1 is operated, gas refrigerant in the compressor 1 is introduced into an evaporator 8 via a condenser 5, a receiver 6 and an expansion valve 7, evaporated and vaporized, and then sucked into the compressor 1 via an accumulator 9. At this time, when a liquid level of liquid refrigerant, refrigerator oil stored in the accumulator 9 is abnormally raised. A solenoid valve 14 receives a signal of a liquid level sensor 15 which has sensed it and opens. Then, hot gas of a high temperature and a high pressure discharged from the compressor 1 is introduced into a housing 10 of the accumulator 9 via a hot gas bypass circuit 13 and the valve 14. When a liquid level in the housing 10 is reset to a normal level height, the valve 14 is closed after a predetermined time is elapsed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner,
The present invention relates to a refrigerator such as a refrigerator and a refrigerated showcase.

[0002]

2. Description of the Related Art FIG. 2 shows a refrigerant circuit of this type of refrigeration system. When the compressor 1 is operated, the gas refrigerant discharged from the compressor 1 enters the condenser 5, where it is condensed and liquefied, then enters the expansion valve 7 via the receiver 6, and is adiabatically expanded by being throttled here. Next, it enters the evaporator 8, where it is evaporated and vaporized, and then passes through the accumulator 9 to the compressor 1.
Sucked into.

The accumulator 9 has a housing 10 and an inlet pipe 11 and a U-shaped outlet pipe 12 disposed therein. The gas refrigerant evaporated and vaporized by the evaporator 8 is supplied to the inlet pipe 11.
Then, the mist of the liquid refrigerant and the refrigeration oil accompanying the gas refrigerant is separated and accumulates at the bottom of the housing 10.

[0004] The gas refrigerant separated from the liquid refrigerant enters the discharge pipe 12 through the upper end opening 12A of the outlet pipe 12, and is sucked into the compressor 1 through the outlet pipe 12. On the other hand, the liquid refrigerant and the refrigerating machine oil 16 stored at the bottom of the housing 10 enter the outlet pipe 12 through a small-diameter oil return hole 12B drilled at the lower part of the U-shaped outlet pipe 12, and enter the outlet pipe 12. Gradually returns to the compressor 1 with the gas refrigerant flowing therethrough.

[0005]

If the conventional refrigeration system is stopped for a long time, the gas refrigerant liquefies and accumulates in the evaporator 8 and the suction pipe 17, and when the operation of the refrigeration system is restarted, a large amount of liquid refrigerant is accumulated. 9 and returns to the compressor 1, and the compressor 1
Could be broken by liquid compression. .

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its gist is that a compressor, a condenser, an expansion valve, an evaporator, and an accumulator are arranged in this order. In a refrigerating apparatus having a refrigerant circuit connected thereto, a hot gas discharged from the compressor and a hot gas discharged from the compressor is provided in the accumulator with a liquid level sensor for detecting a liquid level inside the accumulator. The refrigeration system is characterized in that a bypass circuit is provided, and an electromagnetic valve that opens when the liquid level sensor detects an abnormal liquid level is provided in the hot gas bypass circuit.

When the liquid level sensor detects an abnormal liquid level inside the accumulator, the solenoid valve is opened, and hot gas discharged from the compressor enters the accumulator via the hot gas bypass circuit and the solenoid valve. .

When the liquid level in the accumulator returns to the normal liquid level due to the introduction of the hot gas, the solenoid valve can be closed after a predetermined time has elapsed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is shown in FIG. The accumulator 9 is provided with a liquid level sensor 15 for detecting the liquid level inside the accumulator 9. Further, a hot gas bypass circuit 13 for introducing hot gas discharged from the compressor 1 into the accumulator 9 is provided.

The hot gas bypass circuit 13 has a solenoid valve 14 which is opened when the liquid level sensor 15 detects an abnormal liquid level.
Is interposed. The other configuration is the same as that of the conventional one shown in FIG. 2, and the corresponding members are denoted by the same reference numerals and description thereof will be omitted.

When the liquid level of the liquid refrigerant, refrigerating machine oil or the like stored in the accumulator 9 rises abnormally, the solenoid valve 14 is opened in response to a signal from the liquid level sensor 15 which detects this.

Then, the high-temperature and high-pressure hot gas discharged from the compressor 1 is introduced into the housing 10 of the accumulator 9 through the hot gas bypass circuit 13 and the solenoid valve 14 interposed therein, whereby the housing The liquid refrigerant inside 10 is evaporated and vaporized and enters the compressor 1 via the outlet pipe 12.

When the liquid level in the housing 10 returns to the normal liquid level, the solenoid valve 14 is closed after a predetermined time has passed after receiving a signal from the liquid level sensor 15 that has detected this.

[0014]

According to the present invention, when the liquid level sensor detects an abnormal liquid level inside the accumulator, the solenoid valve is opened, and the hot gas discharged from the compressor passes through the hot gas bypass circuit and the solenoid valve. Then, the refrigerant enters the accumulator and evaporates and evaporates the liquid refrigerant in the accumulator, so that the liquid refrigerant can be prevented from returning to the compressor, and therefore, the compressor can be prevented from being damaged.

When the liquid level in the accumulator returns to the normal liquid level due to the introduction of the hot gas, if the solenoid valve is closed after a lapse of a predetermined time, the performance of the refrigerating apparatus can be prevented from being reduced.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an embodiment of the present invention.

FIG. 2 is a refrigerant circuit diagram of a conventional refrigeration apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 5 Condenser 7 Expansion valve 8 Evaporator 9 Accumulator 15 Liquid level sensor 13 Hot gas bypass circuit 14 Solenoid valve

Claims (2)

[Claims] 1. A refrigerating apparatus comprising a refrigerant circuit in which a compressor, a condenser, an expansion valve, an evaporator, and an accumulator are connected in this order, wherein the accumulator detects a liquid level inside thereof. And a hot gas bypass circuit for introducing hot gas discharged from the compressor into the accumulator, wherein the hot gas bypass circuit is opened when the liquid level sensor detects an abnormal liquid level. A refrigeration apparatus characterized by having a valve interposed. 2. The refrigerating apparatus according to claim 1, wherein the liquid level in the accumulator returns to a normal liquid level by introducing the hot gas, and the solenoid valve is closed after a predetermined time has elapsed. .