JPH11230074A - Oil cooled rotary compressor and oil separator to be used for it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent pollution from being generated in discarding and to prevent adverse effect to lubricating oil. SOLUTION: A separating element 4 to be held in an oil separator of an oil-cooled compressor is wound and formed on a porous cylinder 13 by sequentially overlapping a cohesion layer protective film 10 formed of a metallic net, a cohesion layer 11 formed by laminating glass woven closer than the protective film, and an cohesion layer protective film 12 formed of a metallic net. The cohesion layer 11 is formed of a glass fiber having the diameter of about 1 μm. A separating layer 14 formed of glass wool having the diameter larger than the coagulating layer, a wire mesh, non-woven fabric is attached inside the cylinder 13, a cylindrical expand metal 15 is attached inside the separating layer 14, and a bottom cover 16 is formed on the lower part of the separating element 4. Glass fiber, polypropylene, polyethylene, etc., are used for respective layers of the separating element 4 without using polyvinyl chloride.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-cooled rotary compressor and an oil separator used therefor, and more particularly to an oil-cooled compressor suitable for a screw type compressor and an oil separator used therefor. .

[0002]

2. Description of the Related Art Conventional oil-cooled rotary compressors are:
It is described in JP-A-8-319980. In this publication, the filter medium of the oil separating element is not described in detail, but the lubricating oil injected during the compression stroke of the compressor is a submicron fine oil mist.
Therefore, the oil separation element needs to be composed of the following two layers. ◆ (1) An aggregate layer of glass wool or the like having a fine fiber diameter for collecting and collecting oil mist. ◆ (2) A separation layer on the downstream side for dropping and catching oil droplets having an enlarged particle diameter.

[0003] When a compressor is operated, compressed air passes through the coalesced layer of the oil separator. Fluctuation of the flow velocity occurs due to switching between the load and no load of the compressor, and the fluctuation of the flow velocity may cause fibers such as glass wool to scatter. In order to prevent the scattering of the fibers, holding materials are provided inside and outside the coagulated layer of the oil separator. This holding material is made by coating a glass fiber woven in a net shape with polyvinyl chloride.

[0004] Since the oil separating element of the oil separator has a high temperature of about 100 ° C during operation, a glass fiber net having high heat resistance is suitable as a holding material. However, when glass fibers are used, terminal treatment is required. Therefore, polyvinyl chloride is coated on the glass fiber, and a terminal treatment is performed by heat welding.

[0005]

The above-mentioned prior art uses a glass fiber net coated with polyvinyl chloride and has the advantage of being easily available. However, there are the problems described below.

(3) The oil separation element is a consumable and needs to be replaced after being used for about one year. However, if incinerated as waste, it contains polyvinyl chloride. May occur.

(4) Polyvinyl chloride used as a coating material is liable to be decomposed and deteriorated mainly by a dehydrogenation reaction by heat, ultraviolet rays, oxygen and the like. Therefore, in order to reduce this deterioration, an organic tin compound, an antimony compound, an epoxy compound or the like is added as a stabilizer.
These additives contain heavy metals, albeit in trace amounts, and heavy metal wastes are not preferred. If the epoxy compound is used at a high temperature for a long period of time, it may elute into the lubricating oil and react with an antioxidant or the like contained in the lubricating oil to form sludge or the like.

The present invention has been made in view of these problems of the prior art, and prevents the generation of harmful substances such as dioxin by not using polyvinyl chloride for an oil separator used in an oil-cooled compressor. The purpose is to: Another object is to provide an oil-cooled compressor that protects the global environment. Another object is to reduce the deterioration of lubricating oil in an oil-cooled compressor.

[0009]

In order to achieve the above object, a compressor has a rotor rotatably supported in a compressor body, and heat generated when the working gas is compressed by rotation of the rotor. In the oil-cooled rotary compressor that dissipates heat with lubricating oil, an oil separator is provided downstream of the compressor body to separate oil contained in the working gas, and the oil separator has a plurality of cylindrical layers. Metal, glass fiber, polypropylene, with an oil separation element, exposing all layers of multiple layers
It is composed of any of polyethylene, polyester, nylon and non-woven fabric.

[0010] Preferably, the plurality of layers include a filter medium,
A metal wire mesh layer adjacent to the filter medium and coarser than the filter medium; a filter medium and glass fiber, polypropylene, polyethylene,
A layer composed of any of polyester, nylon and nonwoven fabric; a layer not containing polyvinyl chloride.

[0011] More preferably, the filter medium is made of any one of glass fiber, polypropylene, polyethylene, polyester, nylon and non-woven fabric.

Another feature of the present invention to achieve the above object is an oil separator of an oil-cooled rotary compressor, which comprises an exposed metal, glass fiber, polypropylene, polyethylene,
It has an oil separation element having a plurality of layers consisting of any layer of polyester, nylon and non-woven fabric. And preferably, each layer of the element is free of PVC.

With the above-described structure, the fibers of the condensed layer made of fine fibers are stably held without scattering even when the flow rate of the compressed air changes. Also, there is no possibility of causing pollution at the time of disposal, and there is no adverse effect on the lubricating oil.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of the present invention. FIG. 1 is a system diagram of an oil-cooled rotary compressor, and FIG. 2 is an oil separator provided in the oil-cooled rotary compressor shown in FIG. FIG. 3 is a vertical sectional view of an oil separator equipped with the element shown in FIG.

In an oil-cooled rotary compressor provided with a screw compressor or the like, a rotor is rotatably held in a compression chamber of a compressor body 1. The compressor body 1 sucks a working gas such as air from the suction side by rotation of the rotor, and changes its volume by rotation of the rotor in the compression chamber. Thereby, the working gas is compressed and becomes a high-temperature compressed gas, which is sent from the discharge side to the demand side. Due to this compression action, the working gas generates a large amount of heat. Therefore, a large amount of oil is injected to cool the compression chamber. On the other hand, the rotor is held by a bearing (not shown) in the compression chamber so that the rotor held in the compression chamber can rotate at high speed. Lubricating oil is also injected for lubricating the bearing. Further, oil is also injected to seal a gap formed between the male and female rotors of the screw compressor. The same lubricating oil is used for each of these oils to simplify the oil system. The same lubricating oil is contained in the working gas a discharged from the compressor 1. Therefore, it is necessary to separate the lubricating oil component from the working gas and supply only the working gas component to the demand destination.

In order to separate the lubricating oil component from the working gas, the compressed gas containing a large amount of oil discharged from the compressor discharge port a
Is led into the first container 2 and primary separation of oil is performed by a collision action or a turning action. Thereafter, the compressed gas “a” is passed through a pipe to the head 5 mounted on the second container 3.
Flows into. In the head 5, the flow direction of the gas is changed, and the gas is guided to a space formed by the second container 3 formed by pressing a thin metal plate and the cylindrical separation element 4.

The high-temperature compressed air and oil mist that have flowed into the separation element 4 pass through the cohesive layer protective film 10 formed of a metal net. Since this film is much coarser than the next cohesive layer 11, It does not contribute to oil mist separation. Next, the compressed air and the oil mist pass through the aggregation layer 11 in which the glass wool is laminated. This aggregated layer 11 is 1
It is composed of glass fibers having a fiber diameter of about μm, and the diameter of the oil mist gradually increases during repeated collisions with the glass fibers.

Thereafter, the compressed air containing the oil mist is
It again passes through the aggregation layer protective film 12 formed of a metal net. Incidentally, the aggregated layer protective film 12, the aggregated layer 11, and the aggregated layer protective film 10 are wound around the cylinder 13 in this order and shaped. The cylinder 13 is formed by molding a metal plate having a large number of holes into a cylindrical shape.

The oil droplets formed by the growth of the compressed air and the oil mist are made of a material suitable for dropping the grown oil droplets, such as glass wool having a coarser fiber diameter (thicker fiber diameter), a wire mesh, and a nonwoven fabric than the coagulated layer. Flows into the separation layer 14 composed of. Next, after passing through the cylindrical expanded metal 15 holding the separation layer 14, the oil droplets travel down the inner surface of the separation element 4 and fall by their own weight. The dropped oil drops
It accumulates in the bottom cover 16 at the bottom of the separation element 4. A collection pipe 7 is inserted through the head 5 into the bottom cover 16 where oil droplets accumulate, and the collected oil is sucked up by the collection pipe 7 and returned to the compressor body 1.

The compressed air from which the oil has been separated passes through the check valve 6a and the pressure-holding valve 6b attached to the head 5, and flows out of the head 5. These members are fixed between the bottom cover 16 and the upper cover 17 with an adhesive 18. In addition,
An oil tank is formed at a lower portion of the first container 2 for the primary separation, and after the primary separated oil is appropriately cooled by the oil cooler 9, the male and female of the compressor body 1 are again returned from the tank. It is injected between the two rotors and onto the bearings, and is repeatedly circulated for use.

Since the amount of air used fluctuates, the capacity of the compressor is adjusted using the suction throttle valve 20 and the like. At this time, not only the capacity of the compressor but also the flow velocity of the oil separating element 4 changes. When the compressor is started or stopped, it is necessary to release the pressure inside the compressor to the atmosphere. At this time, the flow velocity also changes greatly. Since such a change in the flow velocity occurs repeatedly during operation of the compressor, the coagulated layer 11 of the oil separation element 4 formed of fine fibers is not scattered even if the flow velocity fluctuates, and is held in the oil separator. Need to be done. In the present embodiment, since the wire mesh is used for the holding members 10 and 12 of the aggregated layer 11, there is no possibility that the above-mentioned fibers are scattered. Furthermore, since no PVC is used, the oil separation element 4 which is a consumable
There is no problem such as pollution when discarded, and there is no adverse effect on lubricating oil. In addition,
The same effect can be obtained by forming the material of the holding member other than a wire net, for example, by forming a glass fiber into a net shape.

In the above embodiment, a wire mesh is used as the holding material. However, instead of the wire mesh, a resin material not containing polyvinyl chloride, for example, a material such as polypropylene, polyethylene, polyester resin, or nylon, is used. A material containing no metal-based stabilizer or epoxy-based compound may be used. Also in this case, since no polyvinyl chloride is used as in the above-described embodiment, there is no problem of pollution at the time of disposal and no adverse effect on the lubricating oil. Furthermore, when manufacturing the oil separation element 4, there is a step of winding the material around the cylindrical expanded metal 15 or the metal cylinder 13 from the inner layer. In the case of the above-described embodiment, in this step, end treatment such as welding, bonding, or sewing is necessary, but in this embodiment, heat welding is possible, and the production can be performed similarly to the case of polyvinyl chloride. It can be simple.

[0023]

As described above, according to the present invention, since polyvinyl chloride is not used as the element material of the oil separator used in the oil-cooled rotary compressor, the disposal cost after use can be reduced. Since no pollutants such as dioxin are generated, environmental pollution can be prevented. Also,
Since the deterioration of the lubricating oil can be prevented, the life and reliability of the oil-cooled rotary compressor can be improved.

[Brief description of the drawings]

FIG. 1 is a system diagram of an oil-cooled rotary compressor according to one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of an oil separation element of the oil separator used in the oil-cooled rotary compressor according to one embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of an oil separator used in an oil-cooled rotary compressor according to one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Compressor main body, 2 ... First container, 3 ... Second container, 4
... oil separation element, 5 ... head, 11 ... cohesive layer, 12
... Aggregating layer protective film, 13 ... Cylinder, 14 ... Separation layer, 15 ... Expanded metal, 16 ... Bottom cover.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B01D 39/16 B01D 35/02 E

Claims (7)

[Claims] An oil-cooled rotary type compressor having a rotor rotatably supported in a compressor body and radiating heat generated when a working gas is compressed by the rotation of the rotor with lubricating oil. An oil separator for separating oil contained in a working gas is provided downstream of the compressor main body, the oil separator includes an oil separation element having a plurality of cylindrical layers, and the plurality of layers. All layers of exposed metal, glass fiber, polypropylene,
An oil-cooled rotary compressor comprising any one of polyethylene, polyester, nylon and non-woven fabric. 2. The oil-cooled rotary mold according to claim 1, wherein the plurality of layers include a filter medium and a metal mesh layer adjacent to the filter medium and having a coarser mesh than the filter medium. Compressor. 3. The oil-cooled rotary compressor according to claim 2, wherein said filter medium is made of any one of glass fiber, polypropylene, polyethylene, polyester, nylon and non-woven fabric. 4. The method according to claim 1, wherein the plurality of layers include a filter medium and a layer adjacent to the filter medium and formed of any one of glass fiber, polypropylene, polyethylene, polyester, nylon, and non-woven fabric which is coarser than the filter medium. The oil-cooled rotary compressor according to claim 1, wherein: 5. The oil-cooled rotary compressor according to claim 1, wherein the plurality of layers are layers containing no polyvinyl chloride. 6. An oil separator for an oil-cooled rotary compressor, comprising:
An oil separator having an oil separation element having a plurality of layers composed of any of exposed metal, glass fiber, polypropylene, polyethylene, polyester, nylon, and non-woven fabric. 7. The oil separator according to claim 6, wherein each layer of said element does not contain polyvinyl chloride.