JP5366671B2 - Cyclone oil separator, compression refrigeration apparatus and air compression apparatus provided with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cyclone type oil separator for separating oil mixed in fluid using a centrifugal force. <P>SOLUTION: In this cyclone type oil separator including a shell 11 having an inner wall of which a transverse cross-section is circular, a fluid inlet pipe 15 for allowing the fluid including oil into the shell 11, a fluid outlet pipe 16 connected to the shell 11 for distributing the fluid after separating the oil, and an oil outlet pipe 17 connected to the shell 11 for recovering the separated oil, the fluid inlet pipe 15 is connected to the shell 11 so that the tangential line on the outer peripheral side of a bent pipe 15a and the tangential line of the inner wall of the shell 11 are agreed with each other at a terminal end part of the bent pipe part 15a. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a cyclonic oil separator that separates oil mixed in a fluid, a compression refrigeration apparatus including the same, and an air compression apparatus including the same.

  In a screw compressor for refrigerant and an oil-cooled screw compressor for air, oil is injected into a bearing, a screw rotor, and the like for the purpose of lubrication and clearance sealing. The injected oil is discharged together with the compressed fluid from the screw rotor to the high pressure part. In the high pressure section, an oil separator is generally provided to separate fluid and oil. In recent years, an oil separator is often used in a cyclone system in which a fluid and oil are swirled in a shell having a cylindrical surface, and the oil is attached to the inner wall of the shell by centrifugal force and separated from the fluid. (See, for example, Patent Document 1).

JP 2003-83272 A (page 2-3, FIG. 3)

In the case of a refrigerant compressor or an air compressor, the fluid in the inlet pipe is an annular spray flow, and most of the oil adheres to the inner wall of the inlet pipe. However, when the fluid flows into the cyclone type oil separator from the inlet pipe, most of the oil, except the oil flowing around the small part of the inlet pipe wall where the shell inner wall and the inlet pipe are in contact, Splash into space. At this time, the oil becomes oil droplets of various diameters.
In particular, the oil adhering to the inlet tube wall on the swivel center tube side becomes oil droplets drifting in the vicinity of the swirl center tube when flowing into the shell of the oil separator. Oil droplets with a small diameter among them have a long distance to the inner wall of the shell and a small mass, so the moving speed due to the centrifugal force is low, and it is difficult to adhere to the inner wall of the shell. Furthermore, oil droplets having a small diameter are susceptible to the fluid swirling around the swivel center tube because of their small inertia, and are often drifted around the swirl center tube and are sent out without being separated from the fluid.
These small diameter oil droplets flowing in the vicinity of the swirling center tube have deteriorated the oil separation efficiency of the cyclone type oil separator.

The present invention has been made to solve the above-described problems, and a first object is to reduce the amount of oil droplets flowing around the swivel center tube when oil flows into the shell of the oil separator. Thus, a cyclonic oil separator that improves oil separation efficiency is obtained.
The second object is to obtain a compression refrigeration apparatus and an air compression apparatus having the cyclonic oil separator.

A cyclonic oil separator according to the present invention includes a shell whose inner wall has a circular cross section, a fluid inlet pipe that is connected to an upper portion of the shell and flows a fluid containing oil into the shell, and is connected to the shell. A fluid outlet pipe for delivering the separated fluid, and an oil outlet pipe connected to the shell for recovering the separated oil, the fluid inlet pipe having a curved pipe portion in the vicinity of the shell. , The outer peripheral side tangent at the terminal end of the curved pipe part is connected to the shell so that the tangent of the inner wall of the shell matches, and the terminal end of the curved pipe part is connected to the inner wall of the shell, The fluid inlet pipe has a plurality of curved pipe portions, and the fluid inlet pipe has a wire mesh on the inner wall on the inner peripheral side of the curved pipe portion before the outlet .

  In the cyclonic oil separator according to the present invention, the oil adhering to the inner wall of the fluid inlet pipe is an inner wall from the inner peripheral side to the outer peripheral side of the bent pipe part due to centrifugal force generated when passing through the bent pipe part. Move to. Since the amount of oil adhering to the wall surface on the inner peripheral side of the fluid inlet pipe is less than that in the conventional system, the amount of oil droplets having a small diameter scattered in the space between the swivel center pipe and the shell is reduced. The cyclone type oil separator improves the oil separation efficiency by reducing the oil having a small diameter that is difficult to separate from the fluid in the vicinity of the swivel center tube.

1 is a front view of a cyclonic oil separator according to Embodiment 1. FIG. FIG. 2 is a top view of FIG. 1. 3 is an internal state diagram of a fluid inlet pipe outlet according to Embodiment 1. FIG. 4 is a top view of a fluid inlet pipe having a straight pipe portion according to Embodiment 1. FIG. 4 is a top view of a fluid inlet pipe having a plurality of curved pipe portions according to Embodiment 1. FIG. 5 is a top view of a cyclonic oil separator according to Embodiment 2. FIG. 6 is a structural diagram of a fluid inlet pipe outlet according to Embodiment 2. FIG. 6 is a top view of a cyclonic oil separator according to Embodiment 3. FIG. It is a front view of FIG. 6 is a top view of a cyclonic oil separator according to Embodiment 4. FIG. It is a front view of FIG. It is a block diagram of the compressor integrated with the cyclone type oil separator which concerns on either of the said embodiment. It is the block diagram which applied the cyclone type oil separator which concerns on either of the said embodiment to the compression-type refrigeration apparatus. It is the block diagram which applied the cyclone type oil separator which concerns on either of the said embodiment to the air compressor.

Embodiment 1 FIG.
1 and 2 are views showing a cyclonic oil separator according to Embodiment 1 of the present invention.
In FIG. 1, a cyclonic oil separator 10 includes a shell 11 whose inner wall has a circular cross section, an upper end plate 13 attached to the upper portion of the shell 11, a lower end plate 14 attached to the lower portion of the shell 11, and an upper portion. The shell 11 attached from the mirror surface 13 and the coaxial turning center pipe 12 are provided. Further, the cyclonic oil separator 10 has a fluid inlet pipe 15 for flowing fluid into the shell 11, a fluid outlet pipe 16 for sending fluid from the upper end plate 13, and an oil outlet pipe 17 for discharging oil from the lower end plate 14. . When separating the oil, the lower part of the cyclonic oil separator 10 becomes an oil reservoir.
In FIG. 2, the fluid inlet pipe 15 is connected to the shell 11 and has a curved pipe portion 15 a in the vicinity of the shell 11. The fluid inlet pipe 15 is connected to the shell 11 so that the tangent of the outer peripheral side of the curved pipe portion 15a and the tangent of the inner wall of the shell 11 coincide with each other at the terminal portion of the lower curved pipe portion 15a through which oil and fluid flow. Connected. Regarding the coincidence between the tangent on the outer peripheral side of the curved pipe portion 15a and the tangent on the inner wall of the shell 11 in the present invention, the oil flowing on the outer peripheral side wall surface of the curved pipe portion 15a does not scatter and smoothly flows into the inner wall of the shell 11. Including approximate agreement of degree.

The flow of oil and fluid in the cyclone type oil separator 10 of Embodiment 1 is shown below. The oil and fluid poured into the shell 11 from the fluid inlet pipe 15 are discharged into the shell 11 and descend while swirling. When the oil flows into the shell 11 from the fluid inlet pipe 15, the oil is scattered as oil droplets of various sizes in the space between the turning center pipe 12 and the inner wall of the shell 11. The scattered oil droplets move to the outside of the shell 11 by centrifugal force acting when turning, adhere to the inner wall of the shell 11, and are separated from the fluid. The oil droplets adhering to the inner wall of the shell 11 are dropped by its own weight and collected at the lower part of the cyclonic oil separator 10.
When the fluid reaches the lower end of the turning center tube 12, the fluid flows into the turning center tube 12 and is sent out toward the fluid outlet tube 16.

  In Embodiment 1 of the present invention, a large amount of oil is biased from the inner peripheral side of the curved pipe portion 15a to the inner wall on the outer peripheral side by centrifugal force acting when passing through the curved pipe portion 15a. FIG. 3 is a diagram showing an internal state in the vicinity of the outlet of the fluid inlet pipe 15 where the oil film 18 is biased toward the outer peripheral side. When the amount of oil flowing on the inner wall on the inner peripheral side is reduced at the connecting portion between the shell 11 and the fluid inlet pipe 15, the generation of small oil droplets that scatter and flow near the swivel center pipe 12 and are difficult to separate from the fluid is suppressed. It is done. As a result, the cyclone oil separator 10 has the effect of increasing the oil recovery capability and increasing the oil separation rate.

FIG. 4 is a view showing a fluid inlet pipe having a straight pipe portion according to Embodiment 1 of the present invention.
In FIG. 4, the fluid inlet pipe 15 has a straight and short straight pipe portion 15 c between the end of the bent pipe portion 15 a and the inlet of the shell 11. The cyclone oil separator 10 is provided with the straight pipe portion 15c, so that the effect that the fluid inlet pipe 15 and the shell 11 are easily joined can be obtained.

FIG. 5 is a view showing a fluid inlet pipe having a plurality of curved pipe portions according to Embodiment 1 of the present invention.
In FIG. 5, the fluid inlet pipe 15 has a plurality of curved pipe portions 15 a-b on the same swirling direction and substantially the same plane as the fluid swirling in the shell 11. Each curved pipe part is connected, and the oil passing through the plurality of curved pipe parts is biased to the inner wall on the outer peripheral side of the curved pipe parts 15a-b due to the centrifugal force acting when passing through the curved pipe parts 15a-b. . When there is less oil flowing inside the inner peripheral side, the occurrence of small oil droplets that scatter and flow near the swivel center tube 12 and are difficult to separate from the fluid is suppressed compared to when one curved pipe portion is used. It is done. As a result, the cyclonic oil separator 10 has the effect of increasing the oil recovery capability and improving the oil separation efficiency.

  When a plurality of curved pipe portions are provided in the fluid inlet pipe 15, a short straight pipe portion 15d may be provided between the curved pipe portions.

Embodiment 2. FIG.
FIG. 6 is a diagram showing a cyclonic oil separator according to Embodiment 2 of the present invention.
In FIG. 6, the fluid inlet pipe 15 is provided with a wire mesh 30 in the vicinity of the connection portion with the shell 11 on the inner wall on the inner peripheral side of the curved pipe portion 15 a. FIG. 7 is a cross-sectional view of the vicinity of the outlet of the fluid inlet pipe 15 to which the wire mesh 30 is attached. Other configurations are the same as those of the first embodiment of the present invention. The oil flowing in the fluid inlet pipe 15 flows biased to the inner wall on the outer peripheral side of the curved pipe portion 15a, but some flows as oil droplets in the fluid inlet pipe 15. When the oil droplets pass through the wire mesh, the oil droplets are repeatedly collected and discharged by the wire mesh, and the diameter gradually increases. Even if the oil droplet whose diameter has been increased is discharged near the swivel center tube 12, centrifugal force due to swirl acts and moves to the inner wall of the shell 11 and adheres. The cyclone type oil separator 10 produces an oil droplet having a large diameter by the wire mesh 30, and an effect of increasing the oil separation efficiency can be obtained.

Embodiment 3 FIG.
8 and 9 are views showing a cyclonic oil separator according to Embodiment 3 of the present invention.
8 and 9, the turning center tube 12 has a wire mesh 30 on its outer periphery. Other configurations are the same as those in any of Embodiments 1 and 2 of the present invention. Oil droplets having a small mass that are difficult to separate from the fluid near the swivel center tube 12 flowing from the fluid inlet tube 15 are collected and discharged by the wire mesh 30, and the diameter gradually increases. The oil droplet having a larger diameter acts on the inner wall of the shell 11 due to the centrifugal force, and adheres. The cyclone type oil separator 10 produces an oil droplet having a large diameter by the wire mesh 30, and an effect of increasing the oil separation efficiency can be obtained.
Further, the cyclone type oil separator 10 of the present embodiment has a wire mesh 30 at the lower end of the swivel center tube 12, collects oil droplets having a small diameter, and increases the diameter of the oil droplets. It is possible to increase the oil separation efficiency by dropping it by its own gravity and separating it from the liquid.

Embodiment 4 FIG.
10 and 11 are views showing a cyclonic oil separator according to Embodiment 4 of the present invention.
10 and 11, the shell 11 has a wire mesh 30 on its inner wall. Other configurations are the same as those in any of Embodiments 1 to 3 of the present invention. The cyclone type oil separator 10 collects and collects oil droplets with a wire mesh 30 attached to the inner wall of the shell 11, thereby obtaining an effect of improving oil separation efficiency.

  Further, in the cyclone type oil separator 10 according to the present embodiment, the wire mesh 30 is attached to the inner wall of the shell 11, but even if the wire mesh 30 is attached without being in contact with the shell 11 at a position inside the inner wall of the shell 11. The same effect can be obtained.

  Although Embodiment 2-4 used the wire mesh 30, you may use a punching metal instead.

Embodiment 5 FIG.
FIG. 12 is a diagram showing a configuration of a compressor integrated with the cyclone type oil separator 10 according to any of the first to fourth embodiments.
In FIG. 12, the compressor 40 includes a compression mechanism 41 that compresses a fluid, and a cyclonic oil separator 10 that separates fluid and oil coming out of the compression mechanism 41. The compressor 40 is integrated with the cyclone oil separator 10, and the effect of improving the oil separation efficiency and reducing the size is obtained.

Embodiment 6 FIG.
FIG. 13 is a diagram showing a configuration in which the cyclonic oil separator 10 according to any of the first to fifth embodiments is applied to a compression refrigeration apparatus.
In FIG. 13, the compression refrigeration apparatus includes a refrigerant compressor 50 that compresses refrigerant, a cyclone oil separator 10 that separates mixed oil from the refrigerant when compressed by the refrigerant compressor 50, and a cyclone oil separator. 10 has a condenser 51 for depriving and condensing vaporization heat from the low-oil refrigerant obtained in 10, an expansion valve 52 for adjusting the pressure drop and flow rate of the refrigerant, and an evaporator 53 for evaporating the refrigerant by giving vaporization heat. In the compression refrigeration apparatus, the refrigerant obtained with the cyclone oil separator 10 has a small amount of oil, so that the capacity of the condenser 51 is increased and the effect of increasing the refrigeration efficiency is obtained.

Embodiment 7 FIG.
FIG. 14 is a diagram showing a configuration in which the cyclonic oil separator 10 according to any of the first to fifth embodiments is applied to an air compressor.
In FIG. 14, the air compressor includes a filter 61 that takes an excess component of air, an air compressor 60 that compresses air coming from the filter 61, and a cyclonic oil that separates oil mixed with air by the air compressor 60. It has the separator 10 and the air cooler 62 which cools air. In the air compressor, the capacity of the air cooler 62 is increased by the air having a small amount of oil obtained by the cyclonic oil separator 10, and the effect of increasing the air cooling efficiency is obtained.

  DESCRIPTION OF SYMBOLS 10 Cyclone-type oil separator, 11 Shell, 12 Turning center pipe, 13 Upper end plate, 14 Lower end plate, 15 Fluid inlet pipe, 15a-b Curved pipe part, 15c-d Straight pipe part, 16 Fluid outlet pipe 17 Oil outlet pipe , 18 Oil film, 30 Wire mesh, 40 Compressor, 41 Compression mechanism, 50 Refrigerant compressor, 51 Condenser, 52 Expansion valve, 53 Evaporator, 60 Air compressor, 61 Filter, 62 Air cooler.

Claims (6)

A shell whose inner wall has a circular cross section, a fluid inlet pipe connected to the upper part of the shell for flowing fluid containing oil into the shell, and a fluid outlet pipe connected to the shell for delivering fluid separated from oil An oil outlet pipe connected to the shell and recovering the separated oil,
The fluid inlet pipe has a curved pipe portion in the vicinity of the shell, and is connected to the shell so that a tangent line on the outer peripheral side coincides with a tangent line of the inner wall of the shell at a terminal portion of the curved pipe section. It is,
An end of the bent pipe portion is connected to the inner wall of the shell;
The fluid inlet pipe has a plurality of curved pipe portions;
The cyclonic oil separator according to claim 1, wherein the fluid inlet pipe has a wire mesh on the inner wall on the inner peripheral side of the curved pipe portion before the outlet . Comprising a swivel center tube attached to the upper inside of the shell;
The turning center tube, cyclonic oil separator of claim 1 Symbol mounting and having a wire mesh on its outer or lower end. The cyclone-type oil separator according to claim 1 or 2 , wherein the shell has a wire mesh on the inner wall or in the vicinity of the inner wall. The cyclone type oil separator according to any one of claims 1 to 3 , wherein the cyclone type oil separator is integrated with a compressor. A compression refrigeration apparatus comprising the cyclone oil separator according to any one of claims 1 to 4 . An air compressor comprising the cyclonic oil separator according to any one of claims 1 to 4 .

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