JPH0623885Y2 - Adsorber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an adsorber suitable for a helium compression unit or the like in a cryogenic refrigerator.

(Prior Art) A Gifford-McMahon cycle or an improved Solvay cycle is often used in this type of cryogenic refrigerator due to its reliability and price, but in these cycles, an oil-lubricated helium compression unit is used.

A system diagram of this type of helium compression unit is shown in FIG. The helium gas compressed by the compressor 1 enters the gas cooler 2, where it is cooled by cooling water and then enters the oil separator 3, where the mist of lubricating oil contained in the gas is removed. Then enter Adsorber 4,
Here, after the vapor of the lubricating oil contained in the gas is removed,
It is sent to the expansion mechanism of a cryogenic refrigerator (not shown). The low-pressure helium gas flowing from the cryogenic refrigerator is sucked into the compressor 1 again via the surge bottle 5.

The lubricating oil heated by lubricating the compressor 1 enters the oil cooler 6, where it is cooled by the cooling water and then returns to the compressor 1 again. The lubricating oil separated by the oil separator 3 is also returned to the compressor 1. 7 is a relief valve,
It is interposed in a bypass circuit 8 that connects the outlet of the oil separator 3 and the outlet of the surge bottle 5.

Details of the conventional adsorber 4 are shown in FIG. In FIG. 2, 10 is a casing, 11 is granular activated carbon as an adsorbent filled in the casing 10, and 12 is granular activated carbon.
Cushioning materials arranged above and below the 11 layers hold the granular activated carbon 11 so that it will not be destroyed. 13
Is a punching metal, which is arranged below and above the cushion material 12.

The helium gas horizontally flows from a gas inlet 14 that opens at the lower part of the side wall of the casing 10 into an inlet chamber 15 formed below the punching metal 13, where the direction of the flow is turned upward and the punching metal 13 and cushion are provided. The material 12, the granular activated carbon 11, the cushion material 12, and the punching metal 13 are passed in this order into the outlet chamber 16 formed above the gas outlet, where the flow direction is reversed and the gas outlet is opened at the upper side wall of the casing 10. It is discharged from 17. Then, in this process, the vapor of the lubricating oil contained in the helium gas becomes granular activated carbon 11
Is adsorbed on.

(Problems to be solved by the invention) In the conventional adsorber described above, the helium gas flows horizontally at a high speed into the inlet chamber 15 formed below the punching metal 13 from the gas inlet 14 opening at the lower portion of the side surface of the casing. Therefore, a large amount of gas flows from the gas inlet 14 toward the gas outlet 17 in the shortest distance without having a uniform velocity distribution. As a result, the granular activated carbon 11 that does not touch the helium gas is generated, and at the same time, the granular activated carbon 11 that contacts a large amount of the helium gas is generated, so the capacity of the adsorber must be increased, and as a result, the adsorber becomes large and heavy. There was a problem that the cost increased.

(Means for Solving Problems) The present invention has been proposed to address the above problems, and the gist of the present invention is that gas accompanied by mist of lubricating oil and steam is generated in the lower part of the casing. After the vapor of the lubricating oil is adsorbed by the adsorbent in the process of entering the formed inlet chamber and flowing through the adsorbent layer such as granular activated carbon filled above it, the outlet chamber formed on the upper part thereof In the adsorber that flows out through the gas supply pipe, a gas supply pipe that is laterally inserted into the inlet chamber and extends horizontally over almost the entire width of the inlet chamber is provided in the lower portion of the casing, and the gas supply pipe has a sidewall having substantially the entire length. The adsorber is characterized in that a plurality of injection ports for ejecting the gas toward the bottom surface of the inlet chamber are provided at equal intervals over the.

(Operation) In the present invention, since it has the above configuration, the gas accompanied by mist and steam is ejected from the injection port toward the bottom surface of the inlet chamber, diffuses and inverts by colliding with the bottom surface,
The velocity distribution becomes uniform and the adsorbent flows at a uniform velocity over the entire area of the layer.

(Embodiment) One embodiment of the present invention is shown in FIG.

A gas supply pipe 18 penetrates the lower part of the side wall of the casing 10 and extends horizontally in an inlet chamber 15 formed below the punching metal 13. A tip end of the gas supply pipe 18 is closed by a lid 19, and a large number of injection ports 20 opening downward are formed at a lower surface of the tip portion at predetermined intervals.
Other configurations are similar to those of the conventional one shown in FIG. 2, and corresponding members are designated by the same reference numerals.

Then, the helium gas supplied through the gas supply pipe 18 is jetted downward from the numerous injection ports 20 into the inlet chamber 15, and is diffused and inverted by colliding with the bottom surface of the inlet chamber 15, With uniform velocity distribution, punching metal 13, cushion material 12, layer of granular activated carbon 11, cushion material 12, punching metal 13 pass through the entire surface in this order to enter outlet chamber 16, where it is turned and gas outlet 17 Drained from. During this time,
The mist of the lubricating oil remaining in the helium gas without being separated by the oil separator 3 is separated and removed when the helium gas collides with the bottom surface of the inlet chamber 15, and the vapor of the lubricating oil contained in the helium gas is granular activated carbon. It is adsorbed when flowing through 11 layers.

In the above embodiment, the vapor of the lubricating oil is adsorbed by passing the high pressure helium gas accompanied by the mist and vapor of the lubricating oil through the layer of granular activated carbon, but any mist and vapor other than the lubricating oil may be adsorbed. The gas can be passed through a bed of any adsorbent.

(Effect of the Invention) In the present invention, the gas accompanied by the mist of the lubricating oil and the vapor is ejected from the injection port toward the bottom surface of the inlet chamber, and when it collides with the bottom surface, it diffuses and inverts, and a uniform velocity distribution Then, it flows through the bed of the adsorbent at a uniform speed over its entire area.

Therefore, since all of the adsorbent contacts the gas almost uniformly, the load of the adsorbent becomes uniform, the adsorbing ability of the adsorber is improved, and the life of the adsorbent is extended. As a result, the adsorber becomes lightweight, compact, and inexpensive. Further, since the mist contained in the gas is removed when it collides with the bottom surface of the inlet chamber and is reversed, the load of the adsorbent can be further reduced. In addition, a gas supply pipe that is horizontally inserted into the inlet chamber from the side and extends horizontally over substantially the entire width of the inlet chamber is provided at the lower portion of the casing, and a space is provided on the side wall of the gas supply pipe over substantially the entire length thereof. Since a plurality of nozzles are provided separately from each other, a large amount of gas can be supplied from the plurality of nozzles into the inlet chamber at a predetermined speed over the entire width, while the structure is simple and inexpensive. And the distance from the bottom of the entrance chamber becomes uniform.

Therefore, the gas ejected from the plurality of nozzles can be collided with the bottom surface of the inlet chamber at a substantially uniform speed, so that the mist of the lubricating oil in the gas can be efficiently separated and the gas can be reversed by colliding with the bottom surface of the inlet chamber. The rising speed of the generated gas can be made uniform.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical sectional view showing an embodiment of the present invention, FIG. 2 is a vertical sectional view of a conventional adsorber, and FIG. 3 is a system diagram of a helium compression unit. Casing …… 10, inlet chamber …… 15, adsorbent …… 11, outlet chamber …… 16, injection port …… 20

Continuation of the front page (56) References Shown 54-45250 (JP, U) Shown 62-83156 (JP, U) Shown 28-7779 (JP, Y1)

Claims (1)

[Scope of utility model registration request] 1. A lubricating oil mist and a gas accompanied with steam enter an inlet chamber formed in a lower part of a casing, and pass through a layer of an adsorbent such as granular activated carbon filled above the inlet chamber. After adsorbing the vapor by the adsorbent, the adsorber flows out through the outlet chamber formed in the upper part of the adsorber, and is inserted into the inlet chamber from the side of the lower portion of the casing over substantially the entire width of the inlet chamber. A horizontally extending gas supply pipe is provided, and a plurality of nozzles for ejecting the gas toward the bottom surface of the inlet chamber are provided on the side wall of the gas supply pipe at intervals over substantially the entire length thereof. Adsorber.