JP2520573B2 - Gas cooling device for refrigerator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating machine gas cooling system which is a heat exchange device for efficiently cooling a high-temperature gas discharged from a low-stage side compressor in a multi-stage compression refrigerating system in a compact, lightweight manner. Regarding the device.

[0002]

2. Description of the Related Art Conventionally, in a multi-stage compression refrigerator, when the high temperature gas discharged from the low stage side is sucked into the high stage side compressor as it is, the high stage side compressor becomes overheated. Therefore, as shown in FIGS. 5 and 6, a high temperature gas is mixed with a low temperature evaporative liquid, and the gas is cooled by latent heat of vaporization of the low temperature liquid to prevent overheating of the high pressure side compressor. However, if the low-temperature liquid is sucked into the high-stage compressor without being evaporated, the compressor will be damaged by the liquid compression. Therefore, as shown in FIG. 5, the liquid separator mechanism is used to recover the unvaporized liquid. A large container with 20 was needed. Further, in order to eliminate the need for a large container for separating the non-evaporated liquid, as shown in FIG. 6, the two-phase flow of the high-temperature gas discharged from the low-stage compressor and the evaporative low-temperature liquid is mixed. Needed a long conduit 21 for

[0003]

SUMMARY OF THE INVENTION In view of the above, the present invention has an independent small size / multi-stage compression refrigeration facility for mixing an evaporative low temperature liquid with a low temperature side high temperature discharge gas.
The purpose is to construct a lightweight refrigerator gas cooling device, attach it compactly to the refrigeration compressor, efficiently cool the high temperature gas, and prevent overheating operation and liquid compression of the high-stage compressor. To do.

[0004]

In order to achieve the above object, the gas cooling device for a refrigerator of the present invention is a multi-stage compression refrigeration system, in which a low-stage discharge gas pipe from a low-stage compressor is connected. A hollow cylinder having a gas inlet at one end and a gas outlet connected to the suction side of the high-stage compressor at a side portion on the other end side is provided. Inside the cylindrical body, a perforated plate is spirally arranged, and from the other end of the cylindrical body, an evaporative low-temperature liquid pipe that has an outflow hole near the inlet and is depressurized to an intermediate pressure and cooled, The spiral perforated plate is provided so as to be eccentrically located from the center of the cylinder to form a spiral flow path in which the cross-sectional area of the flow path changes between left and right of the center of the cylindrical chamber.

The high-temperature discharge gas entering through the discharge gas inlet pipe has a high-speed swirl rate at a variable speed because the low-temperature vaporizing liquid pipe is provided at an eccentric position by penetrating the spiral porous plate. It is composed of a mixing chamber that generates a vortex and mixes it with the evaporative low-temperature liquid to cool it, and a gas cooler that is provided with a gas outlet pipe that sends the cooling gas to the suction side of the high-stage compressor by a pipe. There is. The mixing chamber has a structure in which a high temperature gas and an evaporative low temperature liquid enter from above and are spirally partitioned by a perforated plate for swirling both of them inside at high speed, and a vortex gas and liquid flow.

[0006]

The high-temperature gas discharged from the low stage flows from the low-stage discharge gas inlet of the gas cooler for the refrigerator, and when passing through the narrow spiral flow passage formed by the perforated plate, a high-speed gas having a swirl flow is generated. It becomes a swirling flow and flows downward. Since the liquid pipe is installed at an eccentric position from the center of the gas cooler for the refrigerator, the flow passage cross-sectional area changes, and the swirling flow speed fluctuates, further promoting the generation of vortex flow.

At the upper part of the apparatus, the evaporative low-temperature liquid flowing from the liquid pipe adheres to the perforated plate to form a liquid film, which is affected by the swirling flow of the high-temperature gas to form a uniform liquid film and flows to the downstream side. To do. At this time, the evaporative low-temperature liquid is heated and gasified by contact with the high-speed swirling flow of the high-temperature gas, and is mixed by the vortex flow to become the low-temperature gas.

A part of the liquid film attached to the perforated plate passes through the small holes of the perforated plate due to the pressure difference between the front side and the back side of the perforated plate to form liquid particles and is ejected into the downstream high temperature gas. Since the liquid particles pass through minute holes in the perforated plate, and because the liquid film thickness on the perforated plate surface is thin, the particle size is small and the heat transfer with the gas is good, facilitating the evaporation action of the liquid. It becomes a low temperature gas and mixes with the high temperature gas.

Further, since the perforated plate has a spiral shape,
Since a long pipe length and a wide heat transfer surface are formed as compared with the entire length of the gas cooling device for a refrigerator, liquid compression is prevented without being sucked into the high-stage compressor in a liquid particle state.

[0010]

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a flow sheet showing an outline of a multi-stage compression refrigerator,
Between the low temperature side high temperature discharge gas pipe 2 of the low pressure side compressor 1 and the high pressure side suction gas pipe 4 of the high pressure side compressor 3, the high temperature discharge gas inlet 7 on the low pressure side Light weight equipped with a mixing chamber 12 that allows low-temperature liquid to flow out through the low-temperature liquid pipe 8 and mixes and cools the low-temperature side high-temperature discharge gas and the evaporative low-temperature liquid.
A small gas cooler 5 is constructed. Ammonia for low temperature liquid
・ Use CFCs and other liquefied gases.

FIGS. 2 to 3 are detailed views of the gas cooler 5 described above. The gas cooler 5 is biased to one end of a hollow cylindrical body 6 of a predetermined length and is biased to a high temperature on the low stage side. A gas inlet 7 provided with the discharge gas pipe 2 is provided, and a porous plate 9 is provided inside the cylindrical body 6 from the gas inlet 7 side to the gas outlet 13 side formed on the other side surface of the cylindrical body 6. An evaporative low-temperature liquid pipe 8 is provided which forms a spirally arranged flow path and is provided with an outflow hole 11 through which the low-temperature liquid flows out from the other end side of the cylindrical body 6 closer to the inlet side of the spiral flow path. By installing the porous plate 8 at a position eccentric from the center of the cylindrical body, the mixing chamber 12 in which the spiral flow passage 10 in which the spiral flow passage cross-sectional area changes is formed.

The high-temperature discharge gas sent from the low-temperature side high-temperature discharge gas pipe 2 enters the inside of the cylindrical body 6 of the gas cooler 5 from the gas inlet 7 and is narrowly flowed by the perforated plate 9 in a spiral shape. A high-speed swirling flow is generated by passing through the passage 10, and at this time, since the evaporative low temperature liquid pipe 8 is installed at a position eccentric from the center of the gas cooling device for the refrigerator, the flow passage cross-sectional area changes. In other words, since the swirling flow velocity fluctuates, it is possible to further promote the generation of the vortex flow.

On the other hand, an evaporative liquid is used as the low temperature liquid. The low-temperature liquid flows out from the outflow hole 11 provided in the low-temperature liquid pipe 8 near the high-temperature discharge gas inlet 7, and flows down and adheres onto the spiral porous plate 9. Further, in the spiral narrow channel 10 formed by the perforated plate 9, the swirling flow of the discharge gas is generated at a high speed as described above, so that the evaporative low-temperature liquid flowing from the liquid pipe 8 is permeated. Although it adheres to the plate 9 to form a liquid film, it becomes a thin uniform liquid film under the influence of the high-speed swirl flow of the above-mentioned high-temperature gas shift, and a part of the liquid film is formed on the front and back of the porous plate 9. It passes through the small holes 9a of the perforated plate 9 due to the pressure difference,
It becomes a liquid droplet and flows to the downstream side and jets into the high temperature gas. Further, since the liquid particles pass through the minute holes 9a of the perforated plate 9 and the liquid film thickness of the perforated plate 9 is thin, the particle size is small and the heat transfer with the gas is good, and the temperature is high. It is possible to improve the contact and mixing performance between the gas and the low temperature liquid.

Therefore, the two-phase gas is smoothly and quickly mixed by the contact mixing of the high temperature gas and the low temperature liquid,
The heat exchange by the latent heat of vaporization of the evaporative low temperature liquid is extremely good, and the high temperature discharge gas can be instantly cooled in a short distance.
A low temperature gas is continuously fed from the gas outlet 13 of the cylindrical body to the suction gas pipe 4 on the suction side of the high-stage side compressor through the end of the spiral flow path. Incidentally, the gas cooling device of the present invention,
The horizontal arrangement using the cylindrical body shown in FIG. 1 in the horizontal direction or the vertical arrangement using the cylindrical body in the vertical shape as shown in FIGS.

[0015]

According to the present invention having the above-described structure, in a multistage compression refrigeration facility, a high temperature gas discharged from the low stage compressor of the multistage compressor is efficiently gasified with an evaporative low temperature liquid. Since they can be brought into contact with and mixed with each other to form a low-temperature gas, the mixing performance of the discharged high-temperature gas and the evaporative low-temperature liquid can be easily enhanced, and the high-temperature gas can be cooled quickly in a short distance. It is possible to obtain an efficient compact and lightweight gas cooling device for a refrigerator.

Further, since it can be compactly attached to the refrigeration compressor and the perforated plate has a spiral shape, it has a long pipe length and a wide heat transfer compared with the entire length of the gas cooling device for the refrigerator. Since the surface is formed, it is not sucked into the high-stage side compressor as it is in the liquid particle state, and it is possible to prevent overheating operation and liquid compression of the high-stage side compressor.

[Brief description of drawings]

FIG. 1 is a flow sheet showing an outline of a multistage compression refrigerator using a gas cooling device of the present invention.

FIG. 2 is a sectional view of a gas cooling device for a refrigerator of the present invention.

FIG. 3 is a plan view of FIG. 2;

FIG. 4 is an enlarged detailed view of a main part of FIG.

FIG. 5 is a flow sheet showing a cooling mechanism for high-temperature discharge gas of a conventional multistage compression refrigerator.

FIG. 6 is a flow sheet diagram showing a cooling mechanism in the case of the conventional long pipeline.

[Explanation of symbols]

 1 ... Low-stage compressor 2 ... High-temperature discharge gas pipe of low-stage compressor 3 ... High-stage compressor 4 ... Intake gas pipe of high-stage compressor 5 ... Gas cooler 6 ... Cylinder 7 ... High temperature Discharge gas inlet 8 ... Evaporative low-temperature liquid pipe 9 ... Perforated plate 9a ... Small hole 10 ... Spiral flow path 11 ... Outflow hole 12 ... Mixing chamber 13 ... Gas outlet

Claims (2)

(57) [Claims] 1. A low-stage high-temperature discharge gas cooling device,
Inside the cylindrical body connected to the low-stage high-temperature discharge gas pipe and having a gas inlet at the end, a perforated plate was spirally arranged, and an evaporative low-temperature liquid pipe with an outflow hole near the inlet was installed. , It is installed at a position eccentric from the center of the cylinder through the perforated plate to form a spiral flow passage with a variable cross-sectional area, generating a high-speed swirling vortex of high-temperature gas and flowing it down on the perforated plate. A refrigerating machine gas cooling device, characterized in that the refrigerating machine gas is brought into contact with and mixed with a low-temperature liquid to be cooled, and then sucked into a high-stage compressor from a gas outlet provided in a cylinder. 2. In the low-stage discharge gas cooling device, the low-temperature evaporative liquid adheres to the spiral porous plate, becomes a uniform liquid film under the influence of the swirling flow of the discharge gas, and liquid particles flow downstream. The gas cooling device for a refrigerator according to claim 1, which produces a gas.