JPH0731099Y2 - Oil adsorber in refrigeration equipment - Google Patents

Description

[Detailed Description of the Invention] << Industrial Application Field >> The present invention relates to the structure of an oil adsorber in a refrigeration system, and in particular, an improvement of the oil adsorber in a refrigeration system using an oil-lubricated compressor. Regarding

<< Prior Art >> In a refrigeration system, high-pressure gas compressed by a compressor is cooled by a cooler and then supplied to a cold head, and the high-pressure gas is adiabatically expanded by the cold head to obtain cold. In this case, when the lubricating oil of the compressor flows into the cold head, the heat accumulator is wrapped in an oil film and heat transfer deteriorates.Therefore, place an oil separator and an oil adsorber in the downstream side of the cooler in order. The oil separator performs two-step oil separation using a porous element such as sintered metal and oil separation using a fibrous element such as glass wool or steel wool. % Oil was separated and the remaining oil was adsorbed by activated carbon in the oil adsorber.

<Problems to be solved> However, when the packing density of the fibrous element is increased, the oil capture rate is increased, but the flow path resistance is correspondingly increased and the gas pressure flowing into the cold head is reduced, The packing density of the fibrous element could not be increased above a certain level. As a result, high-pressure gas mixed with lubricating oil with a large particle size will flow into the conventional oil adsorber, and when the high-pressure gas passes through the activated carbon layer, the oil particles in the gas will undergo sufficient Brownian motion. Could not be done. As a result, the adsorption capacity of activated carbon could not be fully utilized and the oil could not be completely removed by the adsorption layer.

The present invention has been made in view of such a point, and an object thereof is to provide an oil adsorber in a refrigeration system that can fully utilize the adsorption capacity of activated carbon.

<< Means for Solving the Problem >> In order to achieve the above-mentioned object, the present invention provides an oil adsorber (6) used in a cooling device in which the space inside the oil adsorber (6) is divided into upper and lower two spaces. The partition wall (15) (16) is divided into three parts, the uppermost space is connected to the gas lead-out path (25), the activated carbon layer (21) is arranged in the central space, and the oil adsorber (6) is arranged. A protrusion (12a) protruding from the bottom wall (12) of the oil absorber to the lowest space in the oil adsorber (6) is provided.
A gas introduction port (14) for introducing high-pressure gas into the oil adsorber (6) is provided on the upper surface of 2a), and a portion of the lower partition wall (16) facing the gas introduction port (14) faces downward. The filter support part (18) is provided by recessing, the upper partition wall (15) has air permeability, and the lower partition wall (16) is the filter support part (1).
The parts other than 8) are configured to have air permeability, and the cylindrical filter material (19) for ultrafine particles is arranged in the lower space of the oil adsorber (6) to remove the filter material (19). While fitting the upper end part to the filter support part (18), and fitting the lower end part of the filter material (19) to the protrusion part (12a),
It is characterized in that the gas inlet (14) is surrounded by a filter material (19).

<< Operation >> The present invention operates as follows, for example, as shown in FIG. 1 and FIG.

That is, the high-pressure gas (refrigerant gas) from which the lubricating oil component has been separated and removed by the oil separator (5) after being compressed and cooled is the oil adsorber from the gas inlet (14) through the filter material (19). It flows into the lowest space in (6). This high-pressure gas contains particles of the lubricating oil component that have been separated and removed by the oil separator (5), but the filter material (19) has a particle size of the lubricating oil component in the high-pressure gas. Big things, for example
Those larger than 0.1μ are removed. Further, the flow velocity of the high-pressure gas can be suppressed to some extent by passing through the filter material (19).

The high-pressure gas that has passed through the filter material (19) flows through the lower partition wall (16) into the activated carbon layer (21) arranged in the central space of the oil adsorber (6). The particles of the lubricating oil in the high-pressure gas have a diameter of 0.1 μm or less and a low flow rate, and thus are reliably captured by the activated carbon (20) of the activated carbon layer (21) by Brownian motion. The high-pressure gas that has passed through the activated carbon layer (21) is discharged from the gas discharge path (25) and supplied to the cold head (2).

<< Embodiment >> A drawing shows an embodiment of the present invention. Fig. 1 is a vertical sectional view of an oil adsorber, and Fig. 2 is a schematic configuration diagram of a refrigerator.

This refrigerator is a closed-cycle cryogenic refrigerator that uses helium gas as a refrigerant, and is composed of a compressor unit (1) and a cold head (2). The compressor unit (1) is composed of an oil-lubricated hermetic compressor (3), a cooler (4), an oil separator (5) and an oil adsorber (6). ) Is configured such that the porous element (7) made of sintered metal or the like and the fibrous element (8) made of glass wool, steel wool or the like separates oil in two stages. The lubricating oil component separated by the oil separator (5) is returned to the compressor (3) through the oil return passage (9).

As shown in FIG. 1, the oil adsorber (6) has a bottom wall (12) of a bottomed cylindrical container (11) whose upper surface is formed with a filter medium exchange port (10).
A gas introduction port (14) of the gas introduction path (13) is opened, and the inside of the container is divided into three spaces by two partition walls (15) (16) having air permeability. The lower partition wall (16) is supported by the bottom wall (12) via the lower support (17), and the central portion thereof is recessed downward to form the filter support portion (18).
The tubular filter material for ultrafine particles (19) formed of a porous material such as a sintered metal, a microfiber or a membrane between the filter support portion (18) and the bottom wall (12) is the gas inlet ( It is arranged so that it surrounds 14). Activated carbon (20) is filled in the central space sandwiched between the upper and lower partition walls (15) (16), and this central space is filled with the activated carbon layer (21).
It is formed on. The filter medium exchange port (10) of the cylindrical container (11) is sealed by a flange (22), and the filling pressure of the activated carbon layer (21) is adjusted between the upper partition wall (15) and the flange (22). The spring (23) is arranged. The gas outlet passage (25) communicates with the upper space (24). The upper and lower partition walls (15) (16) are formed by a punching plate and felt, respectively, and the lower partition wall (16)
The filter support part (18) has a structure in which the gas permeability is shielded so that the inflowing gas does not directly flow into the activated carbon layer.

In the above embodiment, the gas inlet (14) is opened higher than the inner surface of the bottom wall of the cylindrical container (11), but this is in the high pressure gas introduced from the gas inlet (14). This is to prevent the separated oil content from being taken away by the inflow gas even if the contained oil content is separated in the gas introduction chamber portion and adheres to the inner surface of the bottom wall in the form of an oil film.

In the oil adsorber (6) configured as described above, among the oil components that cannot be completely separated by the oil separator, particles larger than the gap diameter of the filter material (19) for ultrafine particles are the filter material (19).
Therefore, the oil particle diameter of the lubricating oil mixed in the high-pressure gas after passing through the filter material (19) becomes, for example, ultrafine particles of 0.1 μ or less that facilitates Brownian motion. The fine particles are reliably captured by the activated carbon (20) of the activated carbon layer (21).

<Effect> In the present invention, a filter material for ultrafine particles and an activated carbon layer are arranged in an oil adsorber arranged between the oil separator of the refrigeration system and the cold head, and the high-pressure gas flowing from the oil separator is arranged. Since it is configured to pass through the filter material and the activated carbon layer in that order, of the oil that could not be separated by the oil separator, particles larger than the gap diameter of the filter material for ultrafine particles are captured by the filter material. Therefore, after passing through the filter material, the lubricating oil mixed in the high-pressure gas becomes ultrafine particles having an oil particle diameter of, for example, 0.1 μ or less. Further, the flow rate of the high-pressure gas is reduced by passing the filter material. The ultrafine oil particles are surely captured by the activated carbon due to the Brownian motion in the activated carbon layer, so that the oil adsorption device can exhibit high adsorption performance. Moreover, the high-pressure gas supplied from the oil adsorber to the cold head becomes a dry gas body without lubricating oil, and the heat accumulator is not covered with an oil film inside the cold head, and high cooling performance is exhibited for a long time. Can be made.

For example, when the filter material is formed into a flat plate and laid on the lower side of the activated carbon layer, the filter material is placed so that no gap is created between the inner peripheral surface of the oil adsorber and the edge of the filter material. It must be set inside to prevent high pressure gas from flowing into the activated carbon layer without passing through the filter material.
It takes time and effort to set the filter material. On the other hand, in the present invention, by simply fitting the lower end portion of the filter material to the protruding portion and the upper end portion to the filter supporting portion, the gas inlet is surrounded by the filter material without any gap, and the high-pressure gas causes the filter material to pass through. Since it can be prevented from flowing into the activated carbon layer without passing through, the filter material can be set easily and quickly.

Moreover, since the gas introduction port is provided on the upper surface of the protrusion, it is located at a position higher than the bottom wall of the oil adsorber. As a result, it is possible to prevent the lubricating oil component accumulated at the bottom of the oil adsorber from flowing into the gas inlet and obstructing the inflow of high-pressure gas.

In addition, the high-pressure gas that has flowed into the oil adsorber diffuses into the space at the bottom of the oil adsorber at a substantially uniform flow rate by passing through the filter material, so the high-pressure gas becomes almost all of the activated carbon in the activated carbon layer. The contact can be made evenly and the activated carbon is effectively used.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a vertical sectional view of an oil adsorber, and FIG. 2 is a schematic configuration diagram of a refrigerator. 2 ... Cold head, 3 ... Compressor, 4 ... Cooler,
5 ... Oil separator, 6 ... Oil adsorber, 19 ... Filter material, 12 ... Oil adsorber bottom wall, 12a ... Projection, 14 ... Gas inlet, 15/16 ... Partition wall , 18 …… Filter support, 21 …… Activated carbon layer. 25 …… Gas outlet.

Claims (1)

[Scope of utility model registration request] 1. An oil-lubricated compressor (3) for compressing a refrigerant gas, a cooler (4) for cooling a high-pressure gas formed by the compressor (3), and a high-pressure gas thus cooled. And an oil separator (5) for removing lubricating oil,
An oil adsorber (6) and a cold head (2) to which the high-pressure gas that has passed through the oil adsorber (6) is supplied are arranged downstream of the oil separator (5) in the flow direction of the high-pressure gas. In the refrigerating device, the space inside the oil adsorber (6) is divided into upper and lower partition walls (15).
It is divided into three by (16), and the gas outlet (2
5) is connected and activated carbon layer (21) in the central space
And a protrusion (12a) protruding from the bottom wall (12) of the oil adsorber (6) to the lowest space in the oil adsorber (6) is provided, and the upper surface of this protrusion (12a) Is provided with a gas introduction port (14) for introducing the high-pressure gas into the oil adsorber (6), and a portion of the lower partition wall (16) facing the gas introduction port (14) is located on the lower side. The filter support portion (18) is provided by being recessed, the upper partition wall (15) has air permeability, and the lower partition wall (1
6) is configured to have air permeability in a portion other than the filter support portion (18), and has a cylindrical filter material (19) for ultrafine particles in the lowermost space in the oil adsorber (6). The filter material (19) and the upper end of the filter material (19) is fitted to the filter support portion (18).
An oil adsorber in a refrigerating apparatus, characterized in that the lower end of (9) is fitted into the protrusion (12a) and the gas inlet (14) is surrounded by the filter material (19). .