JPH08271092A - Refrigerator - Google Patents

Abstract

PURPOSE: To obtain a highly durable and reliable refrigerator in which liquid compression does not occur, by a method wherein two or more accumulators are provided and the open end of an inlet pipe of the accumulator on the downstream side of a refrigerant flow path is located at a higher elevation than the open end of an outlet pipe of the accumulator on the upstream side of the refrigerant flow path. CONSTITUTION: An accumulator 7 on the upstream side of a refrigerant flow path and an accumulator 8 on the downstream side of the refrigerant flow path are provided to completely gasify liquid refrigerant that remains un-evaporated at an evaporator 4, and connected by a piping. An open end 10 of the inlet pipe of the accumulator 8 on the downstream side of the refrigerant path is located at a higher elevation than an open end 9 of the outlet pipe of an accumulator 7 on the upstream side of the refrigerant flow path. Therefore, the liquid refrigerant is restrained from flowing into a piping between the accumulator 8 and a compressor 1 during defrosting operation and returns to the compressor 1 after it turns to gas refrigerant completely by the abrupt expansion in the accumulator 8 at the start-up time of the compressor 1. As a result, troubles of compressing parts such as a cylinder due to liquid compression can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accumulator.
The present invention relates to a refrigerator having one or more refrigeration cycles.

[0002]

2. Description of the Related Art In recent years, in refrigerating cycles of refrigerators, how to gasify the refrigerant returned to the compressor has become a problem.

A conventional refrigeration cycle will be described below with reference to FIG. As shown in FIG. 2, the refrigerating cycle of the refrigerator comprises a compressor 1, a condenser 2, a capillary tube 3, an evaporator 4 and an accumulator 5. In this refrigeration cycle, the refrigerant is compressed by the compressor 1 and condensed by the condenser 2 to become a high temperature and high pressure liquid refrigerant. Then, the liquid refrigerant whose pressure has been reduced through the capillary tube 3 is evaporated in the evaporator 4, and the liquid refrigerant that has not been completely evaporated in the evaporator 4 is completely gasified by the accumulator 5 and returns to the compressor 1 and again the compressor. It is compressed by 1 and circulates.

In such a refrigeration cycle, when there is a large amount of liquid refrigerant immediately after the compressor is started, or when there is a large amount of liquid refrigerant that cannot be completely evaporated in the evaporator 4 due to a decrease in heat load, the accumulator 5 completely removes it. There was a problem that the gas could not be gasified and returned liquid was compressed in the compressor, causing a failure in the compression part such as the cylinder.

Therefore, in order to solve this problem, as a conventional refrigerator, by arranging an accumulator 5 as shown in FIG. 3, only the gas is returned to the compressor 1. It is provided with an expandable member 6 made of a shape memory alloy at the inlet of the main body of the accumulator 5 and deflecting the flowing direction of the refrigerant by the deforming and expanding operation of the expandable member 6 according to the temperature change of the refrigerant flowing into the accumulator 5. .

[0006]

In such a conventional method, the refrigerant gasified in the evaporator 4 is defrosted during defrosting.
Since it liquefies again in the pipe between the evaporator 4 and the accumulator 5 having a lower temperature and flows into the accumulator 5, when the compressor 1 is started, the liquid refrigerant is rapidly expanded due to the sudden suction of the compressor 1. However, there is a problem that the liquid refrigerant is returned as it is, and liquid compression is caused.

When the amount of the liquefied refrigerant is large, it overflows from the opening end of the accumulator outlet pipe and flows into the pipe between the accumulator 5 and the compressor 1, so that the compressor 1
At the time of starting, the liquid refrigerant cannot be rapidly expanded due to the rapid suction of the compressor 1, and the liquid refrigerant is returned as it is, which causes a problem of causing liquid compression.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a refrigerator having a refrigeration cycle with high durability and reliability in which liquid compression does not occur.

[0009]

In order to achieve the above-mentioned object, the present invention comprises a compressor for compressing a refrigerant into a high-temperature high-pressure gas refrigerant, a condenser for condensing the high-temperature high-pressure gas refrigerant, and a condenser. Refrigerator provided with a refrigeration cycle formed by connecting a capillary tube for depressurizing the liquid refrigerant, an evaporator for evaporating the liquid refrigerant, and an accumulator for completely gasifying the liquid refrigerant that has not completely evaporated in the evaporator In the above, two or more accumulators are provided, and the open end of the accumulator inlet pipe on the downstream side of the refrigerant flow path is installed above the open end of the accumulator outlet pipe on the upstream side of the refrigerant flow path.

[0010]

According to the present invention, the refrigerant gasified in the evaporator at the time of defrosting is liquefied again in the pipe between the evaporator and the accumulator whose temperature is lower than that of the evaporator and flows into the accumulator when the compressor is started. Although it tries to return to the compressor as it is as a liquid refrigerant, it can be returned to the compressor as a complete gas refrigerant due to the rapid expansion by the accumulator on the downstream side of the refrigerant flow path.

When the amount of liquefied refrigerant is large, it overflows from the opening end of the accumulator outlet pipe and flows into the pipe between the accumulator and the compressor, and returns to the compressor as liquid refrigerant when the compressor starts up, but the refrigerant flow Since the opening end of the accumulator inlet pipe on the downstream side of the passage is installed above the opening end of the accumulator outlet pipe on the upstream side of the refrigerant passage, it suppresses the inflow of liquid refrigerant into the pipe between the accumulator and the compressor during defrosting. When the compressor is started, it can be returned to the compressor as a complete gas refrigerant by the accumulator on the downstream side of the refrigerant channel.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A refrigerator according to an embodiment of the present invention will be described below with reference to the drawings. In the figure, the same reference numerals as those of the conventional example indicate the same members, and detailed description thereof will be omitted.

As shown in FIG. 1, a refrigerator according to an embodiment of the present invention includes a compressor 1 for compressing a refrigerant into a high-temperature high-pressure gas refrigerant.
A condenser 2 that cools and condenses the gas refrigerant, a capillary tube 3 that decompresses the liquid refrigerant, an evaporator 4 that evaporates the liquid refrigerant, and a liquid refrigerant that has not completely evaporated in the evaporator 4. The accumulator 7 on the upstream side of the refrigerant flow path to be gasified and the accumulator 8 on the downstream side of the refrigerant flow path are connected and connected. The inlet pipe opening end 10 of the accumulator 8 on the downstream side of the refrigerant flow path is provided above the outlet pipe opening end 9 of the accumulator 7 on the upstream side of the refrigerant flow path.

In the above structure, during defrosting, the refrigerant gasified in the evaporator 4 is liquefied again in the pipe between the evaporator 4 having a lower temperature than the evaporator 4 and the accumulator 7 on the upstream side of the refrigerant passage. It flows into the accumulator 7 on the upstream side of the road. When the amount of liquefied refrigerant is large, it overflows from the outlet pipe opening end 9 of the accumulator 7 on the upstream side of the refrigerant flow path, flows into the pipe between the accumulator 7 on the upstream side of the refrigerant flow path and the compressor 1, and is compressed. When the machine 1 is started, the liquid refrigerant tries to return to the compressor 1 as it is, but the accumulator 8 on the downstream side of the refrigerant channel is provided and the accumulator 8 on the downstream side of the refrigerant channel.
The inlet pipe opening end 10 of the above is provided above the outlet pipe opening end 9 of the accumulator 7 on the upstream side of the refrigerant flow path, so that during defrosting, between the accumulator 8 and the compressor 1 on the downstream side of the refrigerant flow path of the liquid refrigerant. The inflow into the pipe is suppressed, and the compressor 1 is returned to the compressor as a complete gas refrigerant by rapid expansion by the accumulator 8 on the downstream side of the refrigerant flow path at the time of startup.

As described above, the accumulator 7 on the upstream side of the refrigerant passage and the accumulator 8 on the downstream side of the refrigerant passage are provided, and the inlet pipe opening end 10 of the accumulator 8 on the downstream side of the refrigerant passage has the accumulator on the upstream side of the refrigerant passage. By providing the outlet pipe 7 above the outlet pipe opening end 9, the refrigerant can be completely gasified and returned to the compressor 1 even at the time of startup after defrosting.

[0016]

As described above, in the refrigerator of the present invention, the compressor for compressing the refrigerant into the high-temperature high-pressure gas refrigerant, the condenser for cooling the high-temperature high-pressure gas refrigerant to condense, and the pressure reduction of the liquid refrigerant. Capillary tube, evaporator for evaporating liquid refrigerant, refrigerant pipe upstream accumulator for completely gasifying liquid refrigerant not completely evaporated in the evaporator, and connecting pipe for refrigerant flow downstream accumulator Then, the refrigerating cycle is configured, and since the accumulator inlet pipe opening end on the refrigerant channel downstream side is installed above the accumulator outlet pipe opening end on the refrigerant channel upstream side,
Even when the amount of liquid refrigerant that has flowed into the accumulator on the upstream side of the refrigerant channel during defrosting is large and overflows from the opening end of the accumulator outlet pipe on the upstream side of the refrigerant channel, between the accumulator and the compressor on the downstream side of the refrigerant channel The inflow of the liquid refrigerant into the pipe can be suppressed, and the liquid refrigerant is completely gasified and returned to the compressor due to the rapid expansion in the accumulator on the downstream side of the refrigerant flow path when the compressor is started. Therefore, it is possible to prevent a failure of a compression part such as a cylinder due to liquid compression, and it is possible to provide a refrigerator having a highly reliable compressor.

[Brief description of drawings]

FIG. 1 is a refrigeration cycle diagram of an embodiment of a refrigerator according to the present invention.

FIG. 2 is a refrigeration cycle diagram of a refrigerator having a conventional accumulator.

FIG. 3 is a refrigeration cycle diagram of a refrigerator having a partially improved conventional accumulator.

[Explanation of symbols]

1 Compressor 2 Condenser 3 Capillary tube 4 Evaporator 7 Accumulator on the upstream side of the refrigerant flow path 8 Accumulator on the downstream side of the refrigerant flow path 9 Outlet pipe opening end of the accumulator 7 on the upstream side of the refrigerant flow path 10 Accumulator on the downstream side of the refrigerant flow path 8 inlet pipe opening end

Claims (1)

[Claims] 1. A compressor for compressing a refrigerant into a high-temperature high-pressure gas refrigerant, and a condenser for condensing the high-temperature high-pressure gas refrigerant.
A capillary tube for reducing the pressure of the condensed liquid refrigerant,
A refrigerator provided with a refrigeration cycle in which an evaporator that evaporates the liquid refrigerant and an accumulator that completely gasifies the liquid refrigerant that has not been completely evaporated in the evaporator are connected in a refrigerator, and two or more accumulators are provided. A refrigerator characterized in that the opening end of the accumulator inlet pipe on the downstream side of the refrigerant passage is provided above the opening end of the accumulator outlet pipe on the upstream side of the refrigerant passage.