JPH04174257A - Refrigerator - Google Patents

Abstract

PURPOSE:To reduce noise by connecting a liquid reservoir to a suction side tube of a compressor through a pressure reducing unit separately from a refrigerating cycle. CONSTITUTION:Liquid (oil, liquid refrigerant stored in a compressor) to be reversely fed to an outer tube at the low pressure side of a compressor 2 is guided to a liquid reservoir 8 to be stored through a pressure reducing unit 9 at the time of stoppage of the compressor 2. The liquid refrigerant stored in the reservoir 8 can be gradually returned to the compressor 2 by the unit 9 at the time of restarting the compressor 2. As a result, the liquid reversely fed to a low pressure side tube 7 at the time of restarting is not fed at once in large quantity to the cylinder of the compressor 2, thereby stabilizing the operation of a vane for partitioning between high and low pressures. Thus, so-called vane damage due to collision with a roller is prevented to reduce noise.

Description

[Detailed description of the invention] (b) Industrial application field The present invention relates to a refrigeration system equipped with an internal high-pressure compressor.

(b) Conventional technology Conventionally, this type of refrigeration equipment was
− Internal high-pressure compressor, as stated in publications, etc.
The refrigeration cycle consists of a condenser, pressure reducing device, and evaporator.
A check valve is connected to the suction side piping of the compressor.

The check valve prevents liquid refrigerant from flowing back from the evaporator when the compressor is stopped, thereby preventing damage to the valve due to liquid compression.

(c) Problems to be Solved by the Invention However, the above configuration has the following problem of noise generation, and improvements are desired.

Internal high-pressure type hermetic compressors have a large pressure difference between the high pressure side and the low pressure side in the cylinder during normal operation (maintained), but when the compressor stops, sliding between the cylinder and roller and between the vane and roller occurs. Gas gradually leaks from the high-pressure side to the low-pressure side in the gap, and as a result, the pressure on the low-pressure side inside the cylinder increases compared to during normal operation.For this reason, when the compressor is stopped, the gas stored in the compressor Liquid such as oil or liquid refrigerant flows into the low-pressure side piping through the gap and inside the cylinder and becomes stagnant.

Then, when the engine is restarted, a large amount of the liquid stagnant in the low-pressure side pipe flows into the cylinder at once, causing a liquid compression phenomenon that impedes the operation of the vanes, resulting in so-called vane flying, which causes noise. .

The present invention has been developed in view of the above, and is designed to prevent vane flying caused by liquid compression during the transition time until the compressor reaches a stable state upon restart, and to achieve refrigeration with low compressor noise. The purpose is to provide equipment.

(d) Means for Solving the Problems The present invention configures a refrigeration cycle with an internal high-pressure compressor, a condenser, a pressure reducing device, and an evaporator, and connects the suction side piping of the compressor to the refrigeration cycle. A liquid reservoir is connected via a pressure reducing device.

(E) Function The refrigeration system of the present invention has the above-described configuration, so that when the compressor is stopped, the liquid (oil and liquid refrigerant stored inside the compressor) flowing back into the external piping on the low pressure side of the compressor is removed through the pressure reducing device. When the compressor is restarted, the liquid refrigerant stored in the liquid reservoir can be gradually returned to the compressor by a pressure reducing device. As a result, when restarting, a large amount of liquid that has flowed back into the low-pressure side piping does not flow into the compressor cylinder at once, which stabilizes the operation of the vane that partitions high and low pressure, and prevents the so-called vane from colliding with the roller. Can prevent flying and reduce noise.

Kube) Example Hereinafter, the refrigeration apparatus of the present invention will be explained based on the drawings.

1 is a refrigeration cycle constructed by connecting an internal high-pressure compressor 2, a condenser 3, a capillary tube 4, and an evaporator 5. 6 is a check valve connected to the suction side piping 7 on the low pressure side between the compressor 2 and the evaporator 50. Reference numeral 8 denotes a liquid reservoir connected to the suction side pipe 7 via a capillary tube 9 separately from the refrigeration cycle 1. Here, the internal high-pressure compressor 2 has a closed container as a high-pressure gas chamber, and when the compressor 2 is stopped, this high-pressure gas flows into the suction side pipe 7.
Since the flow backs into the evaporator 5 through the
This is prevented by

In the refrigeration system configured in this way, first the compressor 2
When the compressor 2 stops, liquid such as oil or liquid refrigerant stored in the compressor 2 accumulates in the cylinder through the side clearance of the vane, flows out from the cylinder from the suction side of the cylinder, and flows out from the suction side. Accumulates in piping 7. At this time, the suction side pipe 7
is equipped with a check valve 6, so that the evaporator 5
The liquid in the suction side pipe 7 passes through the capillary tube 9 and is stored in the liquid reservoir 8. Thereafter, when the compressor 2 is restarted, the liquid stored in the liquid reservoir 8 is gradually returned to the compressor 2 through the suction side piping 7 while its flow rate is controlled by the kinapilary tube 9. As a result, when restarting, a large amount of the liquid stored in the low-pressure pipe 7 will not flow into the cylinder of the compressor 2 at once, stabilizing the operation of the vanes that partition high and low pressure, and It is possible to reduce noise by preventing so-called vane flying caused by collision.

This result was also confirmed from the experimental results shown in FIGS. 2 and 3. That is, when the refrigeration cycle 1 according to this embodiment is applied, the noise level (A characteristic) as shown in Fig. 2 is measured, and when the conventional refrigeration cycle is applied, the noise level is measured as shown in Fig. 3'. The following noise level (A characteristic) was measured.As a result, it was confirmed that according to this example, the noise level could be halved compared to the conventional method, especially within 2 seconds immediately after starting the compressor.

(G) Effects of the Invention As described above, according to the present invention, when the compressor is stopped, the liquid (oil and liquid refrigerant stored inside the compressor) flowing back into the external piping on the low pressure side of the compressor is removed by a pressure reducing device. When the compressor is restarted, the liquid refrigerant stored in the liquid reservoir can be gradually returned to the compressor by a pressure reducing device. As a result, when restarting, a large amount of liquid that has flowed back into the low-pressure side piping will no longer flow into the compressor cylinder at once, which will stabilize the operation of the vanes that partition high and low pressure, and prevent so-called vanes from colliding with rollers. Can prevent flying and reduce noise.

[Brief Description of the Drawings] Fig. 1 is a refrigeration cycle of a refrigeration system showing an embodiment of the present invention, Fig. 2 is a noise characteristic diagram of the present embodiment, and Fig. 3 is a noise characteristic diagram of a conventional refrigeration system. . 1... Refrigeration cycle, 2... Internal high pressure compressor, 3
... Condenser, 4... Capillary tube, 5...
・Evaporator, 6. Check valve, 7. Suction side piping, 8 Liquid reservoir,
9. Capillary tube.

Claims (1)

[Claims] (1) A refrigeration cycle is composed of an internal high-pressure compressor, a condenser, a pressure reduction device, and an evaporator, and a liquid reservoir is connected to the suction side piping of the compressor via a pressure reduction device separate from the refrigeration cycle. A refrigeration device featuring: