JP4768522B2 - Oil separator of oil-cooled compressor - Google Patents

Description

  The present invention relates to an oil separator that separates and recovers lubricating oil mixed in a discharge gas from a discharge gas of an oil-cooled compressor.

  Various oil separators having a structure for reducing noise generated when discharge gas from the compressor flows into the oil separator have been proposed.

  For example, Patent Document 1 proposes an apparatus having a silencer in which a casing surrounding a gas inflow portion is provided inside an oil separator, and a sound absorbing material layer facing the gas inflow portion is provided on the wall of the casing. . In this oil separator, the compressed gas flowing into the oil separator does not directly hit the inner wall surface of the oil separator, but hits the sound absorbing material layer to reduce energy, so that noise is reduced.

Further, Patent Document 2 proposes that a sound absorbing material is provided at the tip of the refrigerant inlet pipe inserted in the side wall of the oil separator. In this oil separator, since the energy is reduced by the sound absorbing material before the compressed gas flows into the oil separator, noise is reduced.
JP-A-8-128388 JP-A-2005-98534

  However, in the structure of Patent Document 1, since the silencer is installed inside the oil separator, it takes time and money to manufacture the silencer itself, and to attach the silencer to the oil separator, and the oil separator itself is to some extent. Therefore, there is a problem that it is difficult to make a compact structure.

  Further, in the structure of Patent Document 2, since the silencer is not provided in the oil separator, it is possible to make the oil separator itself a compact structure, but pressure loss is caused by the sound absorbing material provided in the refrigerant inlet pipe. As a result, the compressor performs extra work corresponding to the pressure loss, and the operation efficiency is deteriorated.

  Furthermore, in any structure of the above-mentioned patent document, the oil level of the oil reservoir portion undulates due to pressure fluctuation of the compressed gas, the oil accumulated in the oil reservoir portion scatters, and may be mixed again with the separated gas, There was also a problem that the oil separation performance deteriorated.

  The present invention has been made in view of the above-described conventional problems, reduces noise generated from an oil separator with a simple and inexpensive configuration, has good oil separation performance, and deteriorates the operation efficiency of the compressor. It is an object of the present invention to provide an oil separator that does not occur.

In order to solve the above problems, the present invention provides:
An oil separator for separating oil mixed in discharge gas from an oil-cooled compressor,
A gas inlet provided on the wall of the container body;
An oil reservoir provided vertically below the gas inlet in the container body;
An oil separator elements disposed in a vertically upward from the gas inlet in the container body,
A gas outlet provided in a wall of the container body above the oil separation element;
In an oil separator comprising an oil discharge port provided in a wall of the container body of the oil reservoir,
A sound absorbing material is provided at a position below the gas inlet in the container body and at least at the upper surface not immersed in the oil stored in the oil reservoir.

Here, “at least the upper surface is not immersed in the oil accumulated in the oil reservoir” of the sound absorbing material means that the upper surface of the sound absorbing material is above the oil level of the oil accumulated in the oil reservoir. Specifically, it means one of the following states.
(1) A state in which the sound absorbing material is above the oil reservoir and no part of the sound absorbing material is immersed in the oil in the oil reservoir.
(2) Although the part below the upper surface of the sound absorbing material is immersed in the oil in the oil reservoir, the upper surface of the sound absorbing material is above the oil surface of the oil reservoir.
(3) Although the part below the upper surface of the sound absorbing material is immersed in the oil in the oil reservoir, the upper surface of the sound absorbing material is substantially the same as the oil surface.
In other words, the oil level of the oil reservoir is substantially the same as or lower than the upper surface of the sound absorbing material.
This is because if the sound absorbing material is completely immersed in the oil stored in the oil reservoir, the gap inside the sound absorbing material is filled with the oil, so that the sound absorbing performance of the sound absorbing material is deteriorated.
The height of the oil level of the oil stored in the oil reservoir varies depending on the condition of the compressor, but can be kept constant by adjusting the amount of oil discharged from the oil discharge port.

  In the oil separator configured as described above, since the sound absorbing material insulates the oil reservoir from the gas layer above the oil reservoir, the pressure change of the compressed gas flowing into the container body from the gas inlet causes the oil reservoir to The oil surface does not swell, preventing oil scattering and re-mixing into the compressed gas.

  It is preferable to provide one or more sound absorbing materials different from the sound absorbing material between the sound absorbing material and the oil separation element.

The sound absorbing material is placed on a sound absorbing material support member,
The sound absorbing material support member preferably has an opening through which oil can pass and is fixed to the inner wall of the container body.

The sound absorbing material is placed on a sound absorbing material support member,
The sound-absorbing material support member preferably has an opening through which oil can pass, and floats on the oil stored in the oil reservoir by a float provided below the opening.

The sound absorbing material is placed on a sound absorbing material support member,
The sound absorbing material support member preferably has an opening through which oil can pass and is provided so as to be movable up and down in the container body.

  It is preferable to provide oil level control means for controlling the oil level of the oil reservoir so as not to exceed the upper surface of the sound absorbing material. In this case, the oil level control means controls the oil level by adjusting the oil circulation amount of the oil circulation path through which the oil in the oil reservoir is circulated from the oil discharge port to the oil-cooled compressor.

  It is preferable to provide a sound absorbing material position control means for controlling the position of the upper surface of the sound absorbing material. In this case, the sound absorbing material position control means adjusts the oil circulation amount of the oil circulation path through which the oil in the oil reservoir is circulated by returning it from the oil discharge port to the oil-cooled compressor. Control the position. Alternatively, the sound absorbing material position control means controls the position of the upper surface of the sound absorbing material by directly raising and lowering the sound absorbing material supporting means for supporting the sound absorbing material.

  According to the present invention, since the sound absorbing material is provided at a position below the gas inlet in the container body and at least the upper surface is not immersed in the oil stored in the oil reservoir, the sound absorbing material and the oil reservoir Insulates the upper gas layer, and the oil level in the oil sump does not swell due to the pressure fluctuation of the compressed gas flowing into the container body from the gas inlet, and the oil is scattered and re-mixed into the compressed gas. Is prevented. As a result, the noise generated from the oil separator is reduced with a simple and inexpensive configuration, the oil separation performance is good, and the operation efficiency of the compressor is not deteriorated.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 shows an oil separator 1 according to a first embodiment of the present invention. The oil separator 1 is composed of a cylindrical container body 2 installed in the vertical direction, that is, in the vertical direction. A gas inlet 3 connected to a discharge port of an oil-cooled compressor (not shown) is provided on the side wall of the container body 2. An oil sump 4 is provided vertically below the gas inlet 3 inside the container body 2, that is, at the bottom. An oil separation element 5 is installed vertically above the gas inlet 3 inside the container body 2. A gas outlet 6 is provided on the top wall of the container body 2 above the oil separation element 5, and an oil discharge port 7 is provided on the bottom wall of the container body 2 in the oil reservoir 4. The oil discharge port 7 is for returning the oil in the oil reservoir 4 to the oil-cooled compressor (not shown) for circulation.

  The oil separation element 5 is provided so as to divide the inside of the container body 2 into an upper space and a lower space. The oil separation element 5 is made of a material having sound absorption characteristics, and specifically, a porous material such as glass wool, stainless wool, aluminum fiber sintered material, and stainless steel is preferable.

  In the container main body 2, a sound absorbing material 8 is further provided at a position below the gas inlet 3 and at least a top surface not immersed in the oil stored in the oil reservoir 4. That is, the upper surface of the sound absorbing material 8 is above the oil level of the oil stored in the oil reservoir 4. More specifically, a part below the upper surface of the sound absorbing material 8 is immersed in the oil in the oil reservoir 4, but the upper surface of the sound absorbing material 8 is above the oil surface of the oil reservoir 4.

  Note that the sound absorbing material 8 is located above the oil reservoir 4, and none of the sound absorbing material 8 may be immersed in the oil in the oil reservoir 4. In addition, although the sound absorbing material 8 is immersed in the oil in the oil reservoir 4 at a portion below the upper surface, the upper surface of the sound absorbing material 8 may be substantially the same as the oil surface.

  The sound absorbing material 8 is provided so as to divide the inside of the container body 2 into an upper space and a lower space or an oil reservoir 4. The sound absorbing material 8 is made of a material having sound absorbing characteristics, like the oil separating element 5, and specifically, glass wool, stainless wool, aluminum fiber sintered material, and stainless steel porous material are suitable.

  The sound absorbing material 8 is placed on the sound absorbing material support member 9. The sound absorbing material support member 9 is formed of a punching metal having an opening through which oil can pass, and is fixed to the inner wall of the container body 2. The sound-absorbing material support member 9 is not limited to punching metal, but may be a rod-shaped grid. Further, the sound absorbing material support member 9 is not limited to the one fixed to the inner wall of the container body 2, and the peripheral edge is locked or sandwiched with the inner wall of the container body 2 so as to restrain the movement in the vertical direction and the radial direction. It may be anything.

  In the oil separator 1 having the above configuration, the oil-mixed gas that has flowed into the container body 2 through the gas inlet 3 from an oil-cooled compressor (not shown) forms a swirling flow along the inner wall of the container body 2. . Due to the centrifugal force caused by the swirling flow, the oil in the gas adheres to the inner wall of the container body 2, flows down in the vertical direction, and accumulates in the oil reservoir 4. The gas that forms the swirl flow moves upward in the vertical direction and passes through the oil separation element 5, where oil components that cannot be separated by the swirl flow are captured. The gas that has passed through the oil separation element 5 flows out from the gas outlet 6 and proceeds to the next stroke. Further, the oil component captured by the oil separation element 5 is dropped and collected in the oil reservoir 4. The oil separator 1 may form a turbulent flow instead of a swirling flow.

  An acoustic tube having an upper and lower sound absorbing structure is constituted by the oil separating element 5 and the sound absorbing material 8 respectively disposed above and below the gas inlet 3 in the vertical direction. For this reason, the sound pressure inside the oil separator 1 is reduced, and the radiation sound from the oil separator 1 is reduced. Since the sound-absorbing material support member 9 is fixed to the inner wall, the rigidity of the container body 2 is increased, contributing to the reduction of radiated sound.

  Further, since the lower oil reservoir 4 and the upper gas space are insulated by the sound absorbing material 8 installed on the oil surface portion of the oil reservoir 4, the oil reservoir 4 is accumulated in the oil reservoir 4 due to pressure fluctuation as in the prior art. The oil will not splash. For this reason, there is no decline in oil separation performance.

  Furthermore, since no conventional sound absorbing material is provided at the gas inlet 3, pressure loss does not occur and the operating efficiency of the compressor does not deteriorate.

  In the oil separator 1 of the first embodiment, an oil level control means for controlling the oil level of the oil reservoir 4 is provided so that the upper surface of the sound absorbing material 8 is not immersed in the oil stored in the oil reservoir 4. It is necessary to provide it. A specific example of this oil level control means will be described below with reference to FIG.

  In FIG. 2, the oil separator 1 is the same as that shown in FIG. 1, but an oil level position sensor 10 that detects the oil level of the oil reservoir 4 is provided. The gas inlet 3 of the oil separator 1 is connected to the discharge port of the oil-cooled compressor 11. Between the oil discharge port 7 of the oil separator 1 and the compressor 11, the oil in the oil reservoir 4 is stored in the oil tank 13 through the first adjustment valve 12, and the oil stored in the oil tank 13 is stored in the oil tank 13. An oil circulation path 15 is formed which is circulated back to the compressor 11 via the second regulating valve 14.

  The oil level position information detected by the oil level position sensor 10 is input to the controller 16. The controller 16 controls the first and second regulating valves 12 and 14 of the oil circulation path 15 based on the oil level information from the oil level position sensor 10 of the oil separator 1 to control the oil level.

  Specifically, when the controller 16 determines that the oil level has risen to near the lower surface of the sound absorbing material support member 9, the controller 16 opens both the first adjustment valve 12 and the second adjustment valve 14, and the oil level is increased. The inflow of oil from the reservoir 4 to the oil tank 13 is promoted, and the oil level of the oil reservoir 4 is lowered. Thereby, the state where the upper surface of the sound absorbing material 8 is not immersed in the oil stored in the oil reservoir 4 can be maintained. That is, the sound absorbing material 8 is not always immersed in the oil surface, a two-layer structure of the oil surface and gas can be avoided, and the sound deadening structure by the sound absorbing material 8 and the oil separation element 5 is maintained.

  FIG. 3 shows an oil separator 1A according to a second embodiment of the present invention. In the oil separator 1A of the second embodiment, the sound absorbing material 8a different from the sound absorbing material 8 is vertically moved in the space between the gas inlet 3 and the sound absorbing material 8 of the oil separator 1 of the first embodiment. Since the other structures and functions are the same as those of the first embodiment, the corresponding parts are denoted by the same reference numerals and description thereof is omitted.

  In the oil separator 1A of the second embodiment, since the two sound absorbing materials 8 and 8a are provided below the gas inlet 3, the sound pressure can be further reduced than in the case of the first embodiment. Further, the radiated sound from the oil separator 1A is further reduced.

  FIG. 4 shows an oil separator 1B according to a third embodiment of the present invention. The oil separator 1B according to the third embodiment uses the float type sound absorbing material support member 17, and the other structures and operations are the same as those in the first embodiment. The description will be omitted.

  As shown in FIG. 5, the float type sound absorbing material support member 17 is provided with a plurality of floats 19 provided on the lower surface of a support plate 18 provided with a cross-shaped reinforcing beam 18b inside an annular metal ring 18a. This is designed not to sink into the oil in the reservoir 4. As a result, the sound absorbing material 8 floats on the oil surface without being submerged in the oil reservoir 4. The sound absorbing material 8 is not required to be completely submerged in the oil reservoir 4, and a part of the sound absorbing material 8 may protrude on the oil surface.

  The support plate 18 is not limited to the above as long as it has an opening so that the oil adhering to the sound-absorbing material 8 falls to the oil reservoir 4 below. As shown in FIG. A perforated disk such as

  The float type sound absorbing material support member 17 does not contribute to the reduction of the radiated sound due to the rigidity improvement of the container body 2 unlike the fixed sound absorbing material support member 9 of the first embodiment. However, when the compressor is of an inverter driven variable speed and the fundamental frequency of the noise source changes, the sound absorbing material position control means for controlling the position of the sound absorbing material 8 supported by the float type sound absorbing material support member 17. By providing the sound pressure, the sound pressure can be reduced according to the change of the fundamental frequency. Hereinafter, a specific example of the sound absorbing material position control means will be described with reference to FIG.

  In FIG. 7, the oil-cooled compressor 11 includes a compressor body 20, a compressor driving motor 21, and an inverter 22 that drives the motor 21. The oil separator 1 </ b> B is the same as that shown in FIG. 4, but is provided with a position sensor 23 that detects the position of the upper surface of the sound absorbing material 8 supported by the float type sound absorbing material support member 17. The position sensor 23 may detect the position of the oil level. The gas inlet 3 of the oil separator 1 </ b> B is connected to the discharge port of the oil-cooled compressor 11. Between the oil discharge port 7 of the oil separator 1B and the compressor 11, a first oil circulation path 15a for circulating the oil in the oil reservoir 4 directly back to the compressor 11 and the oil in the oil reservoir 4 Is stored in the oil tank 13 via the first adjustment valve 12, and the second oil circulation path 15b for circulating the oil stored in the oil tank 13 back to the compressor 11 via the second adjustment valve 14 is provided. Is formed.

  The position information detected by the position sensor 23 and the rotational speed information of the oil-cooled compressor 11 are input to the controller 24. The controller 24 includes a rotation speed of the compressor 11, a fundamental frequency of pulsation sound generated in the oil separator 1B that changes in accordance with the rotation speed, and a sound absorbing material suitable for absorbing the pulsation sound of the fundamental frequency. 8 is stored in advance. Then, the controller 24 controls the first and second regulating valves 12 and 14 of the second oil circulation path 15b based on the oil level information from the position sensor 23 of the oil separator 1B and the rotation speed information from the compressor 11. And the upper surface of the sound absorbing material 8 is controlled to an appropriate position.

  Specifically, the controller 24 obtains an appropriate position of the upper surface of the sound absorbing material 8 from the rotational speed information from the compressor 11, and determines the appropriate position of the upper surface of the sound absorbing material 8 from the position sensor 23 of the oil separator 1B. Compare with location information. When the actual position of the upper surface of the sound absorbing material 8 is lower than the appropriate position, both the first adjusting valve 12 and the second adjusting valve 14 are closed, the inflow of oil from the oil reservoir 4 to the oil tank 13 is stopped, and the sound absorbing The upper surface of the material 8 is raised. Conversely, when the actual position of the upper surface of the sound absorbing material 8 is higher than the appropriate position, both the first adjustment valve 12 and the second adjustment valve 14 are opened to promote the inflow of oil from the oil reservoir 4 to the oil tank 13. Then, the upper surface of the sound absorbing material 8 is lowered. Thereby, the upper surface of the sound absorbing material 8 can be maintained at an appropriate position with a high silencing effect, and the sound pressure in the oil separator 1B can be reduced according to the change in the fundamental frequency of the pulsating sound.

  In the embodiment of FIG. 7, the position of the upper surface of the sound absorbing material 8 is adjusted by the float type sound absorbing material support member 17. However, the position of the sound absorbing material is not limited to the float type and is not immersed in the oil surface. Any device can be used as long as it can be adjusted.

  In addition, when the amount of oil sufficient to move the float type sound absorbing material support portion 17 up and down cannot be secured in the oil reservoir portion 4, the sound absorbing material support portion may be moved up and down smoothly mechanically. That is, a rail is provided on the inner wall of the container body of the oil separator, and the sound absorbing material support is supported so as to be movable up and down along the rail, and the sound absorbing material support is moved up and down by a ball screw and a motor. But you can.

  For example, in the oil separator 1C according to the fourth embodiment of the present invention shown in FIG. 8, instead of the float type sound absorbing material supporting member 17 of the third embodiment, the sound absorbing material supporting member that can be moved up and down mechanically. 25. This oil separator 1C is provided with a float type level sensor 26 and a microphone 27 in addition to the sound absorbing material support member 25. Since other structures and operations are the same as those of the third embodiment, the corresponding parts are not included. The same reference numerals are given and description thereof is omitted.

  As shown in FIG. 9, the sound absorber support member 25 of the oil separator 1C is provided at a portion where the metal ring 25a, the cross-shaped reinforcing beam 25b inside thereof, and the reinforcing beam 25b intersect, It consists of a metal small ring 25c having a screw hole into which the ball screw member 28 is screwed. A notch 25d is formed in a part of the metal ring 25a. A rail 29 provided on the inner wall of the container body 2 of the oil separator 1C is configured to fit into the notch 25d. 8 and 9, one notch 25d and one rail 29 are provided, but a plurality of notches may be provided. The ball screw member 26 is connected to a drive shaft of an oil-proof, waterproof, and explosion-proof stepping motor 30 through a coupling, and the stepping motor 30 is supported on the inner wall of the container body 2 by a hollow motor support member 31. A power line and a signal line to the stepping motor 30 are disposed in the hollow portion of the motor support member 31. When the stepping motor 30 is driven to rotate the ball screw member 28, the sound absorbing material support member 25 is movable in the vertical direction along the rail 29. It is desirable that the stepping motor 30 be as small as possible so that excessive pressure loss does not occur in the oil separator 1C due to its presence. From the same point of view, it is desirable to use a motor support member 31 that is as thin as possible, but it is necessary that the motor support member 31 has sufficient rigidity to support the stepping motor 30.

  The float type level sensor 26 is arranged in the vertical direction, the lower end communicates with the bottom of the container main body 2 of the oil separator 1C via the communication pipe 32, and the upper end communicates with the oil of the container main body 2 via the communication pipe 33. A tubular main body 26a communicated with the upper part above the surface, a float 26b accommodated in the main body 26a, and a reed switch 26c for detecting the position of the float 26b by detecting a magnet (not shown) built in the float 26b. When the oil level rises and reaches a predetermined height, a predetermined signal is output from the reed switch 26c.

  The microphone 27 is provided on the side surface of the container body 2 of the oil separator 1C, and collects pulsating sound generated inside the oil separator 1C.

  FIG. 10 shows a sound absorbing material position control system in the oil separator 1C. Parts corresponding to those in the system shown in FIG. The signal line of the stepping motor 30 of the oil separator 1C is connected to a motor drive circuit 34, and the motor drive circuit 34 is controlled by the controller 24. A signal line of the reed switch 26 c of the float type level sensor 26 is connected to the controller 24. The signal line of the microphone 27 is connected to an FFT (Fast Fourier Transform) analyzer 35. The FFT analyzer 35 performs frequency analysis of pulsating sound generated inside the oil separator 1 </ b> C, and the analysis result is input to the controller 24.

  The controller 24 stores in advance an appropriate position on the upper surface of the sound absorbing material 8 suitable for absorbing a pulsating sound having a predetermined fundamental frequency. The controller 24 uses the fundamental frequency of the actual pulsating sound generated inside the oil separator 1C, information on the appropriate position of the upper surface of the sound absorbing material 8 stored in advance, and the current position of the current upper surface of the sound absorbing material 8. Based on the information on (actual position), the stepping motor 30 is driven via the motor drive circuit 34 to control the upper surface of the sound absorbing material 8 to an appropriate position.

  Moreover, if the predetermined signal is not output from the reed switch 26c, the controller 24 considers that the oil level of the oil sump portion 4 is low, and closes both the first adjustment valve 12 and the second adjustment valve 14 to Inflow of oil from the reservoir 4 to the oil tank 13 is prevented (in general, the oil level of the oil reservoir 4 rises at this time). Conversely, when the controller 24 senses that a predetermined signal is output from the reed switch 26c, the controller 24 considers that the oil level of the oil reservoir 4 is high and opens both the first adjustment valve 12 and the second adjustment valve 14. Then, the inflow of oil from the oil reservoir 4 to the oil tank 13 is promoted (At this time, generally, the oil level of the oil reservoir 4 is lowered).

  As described above, the control of the position of the upper surface of the sound absorbing material 8 of the oil separator 1C is independent of the control of the oil level of the oil reservoir 4 and the control of the amount of oil supplied to the compressor body 20. . Therefore, it is possible to simultaneously reduce the sound pressure in the oil separator 1C and optimize the amount of oil supplied to the compressor body 20. Further, since the direct parameter (signal detected by the microphone 27) applied to the sound pressure in the oil separator 1C is used instead of the indirect parameter such as the rotation speed of the compressor 11, the oil separator 1C. The sound pressure can be reliably reduced.

FIG. 11 shows a noise reduction test in the noise separator 1A having the noise reduction structure shown in FIG. 1 and the oil separator without the noise reduction structure (with the sound absorbing material removed) in order to confirm the effect of noise reduction by the oil separator of the present invention. Went. The oil separator used is as follows.
Container body:
Material: STPG370-E
Thickness: 6.4mm
Inner diameter: 203.5mm
Straight line length: 580mm
Oil separation element:
Material: Stainless wool Thickness: 100mm
Height from gas inlet; 200mm
Sound absorbing material:
Material: Stainless wool Thickness: 90mm
Height from gas inlet; 380mm
In the muffling test, the sound pressure level (SPL) at a point 1 m away from the front of the oil separator with respect to noise having a frequency of 1/3 octave band was measured. As a result, as shown in the figure, it was confirmed that the oil separator having the silencing structure was reduced by 2 to 5 decibels compared to the oil separator having no silencing structure.

Sectional drawing of the oil separator of 1st Embodiment of this invention. Schematic which shows the oil level control system of the oil separator of FIG. Sectional drawing of the oil separator of 2nd Embodiment of this invention. Sectional drawing of the oil separator of 3rd Embodiment of this invention. The top view of the sound-absorbing-material support member of the oil separator of FIG. The top view which shows the modification of the sound-absorbing material support member of FIG. Schematic which shows the sound-absorbing-material position control system of the oil separator of FIG. Sectional drawing of the oil separator of 4th Embodiment of this invention. The top view of the sound-absorbing material support member of the oil separator of FIG. Schematic which shows the sound-absorbing-material position control system of the oil separator of FIG. The graph which shows the sound pressure level (SPL) in the point 1m away from the front of the oil separator with respect to the noise of the frequency of 1/3 octave band, which is an experimental result for confirming the effect of the present invention.

Explanation of symbols

1, 1A, 1B, 1C Oil separator 2 Container body 3 Gas inflow device 4 Oil reservoir 5 Separation element 6 Gas outlet 7 Oil outlet 8, 8a Sound absorbing material 9 Sound absorbing material support member 10 Oil surface position sensor 11 Oil cooling Type compressor 12 first adjustment valve 13 oil tank 14 second adjustment valve 15 oil circulation path 16 controller 17 float type sound absorbing material support member 18 support plate 19 float 23 position sensor 15a first oil circulation path 15b second oil circulation path 24 Controller 25 Sound absorbing material support member 26 Float type level sensor 26c Reed switch 27 Microphone 28 Ball screw member 29 Rail 30 Stepping motor 31 Motor support member 32 Communication tube 33 Communication tube 34 Motor drive circuit 35 FFT analyzer

Claims (10)

An oil separator for separating oil mixed in discharge gas from an oil-cooled compressor,
A gas inlet provided on the wall of the container body;
An oil reservoir provided vertically below the gas inlet in the container body;
An oil separator elements disposed in a vertically upward from the gas inlet in the container body,
A gas outlet provided in a wall of the container body above the oil separation element;
In an oil separator comprising an oil discharge port provided on the wall of the container body of the oil reservoir,
An oil separator, wherein a sound absorbing material is provided at a position below the gas inlet in the container body and at least the upper surface is not immersed in the oil stored in the oil reservoir.   The oil separator according to claim 1, wherein one or more sound absorbing materials different from the sound absorbing material are provided between the sound absorbing material and the oil separating element. The sound absorbing material is placed on a sound absorbing material support member,
The oil separator according to claim 1, wherein the sound absorbing material support member has an opening through which oil can pass and is fixed to an inner wall of the container body. The sound absorbing material is placed on a sound absorbing material support member,
2. The oil separation according to claim 1, wherein the sound-absorbing material support member has an opening through which oil can pass, and is suspended in oil stored in the oil reservoir by a float provided below the opening. vessel. The sound absorbing material is placed on a sound absorbing material support member,
2. The oil separator according to claim 1, wherein the sound absorbing material support member has an opening through which oil can pass and is provided so as to be movable up and down in the container body.   4. The oil separator according to claim 3, further comprising oil level control means for controlling the oil level of the oil reservoir so as not to exceed the upper surface of the sound absorbing material.   The oil level control means controls the oil level by adjusting an oil circulation amount of an oil circulation path through which oil in the oil reservoir is circulated by returning the oil from the oil discharge port to an oil-cooled compressor. The oil separator according to claim 6.   The oil separator according to claim 4 or 5, further comprising a sound absorbing material position control means for controlling a position of an upper surface of the sound absorbing material.   The sound absorbing material position control means controls the position of the upper surface of the sound absorbing material by adjusting an oil circulation amount of an oil circulation path through which oil in the oil reservoir is returned from the oil discharge port to the oil-cooled compressor. The oil separator according to claim 8.   10. The oil separator according to claim 9, wherein the sound absorbing material position control means controls the position of the upper surface of the sound absorbing material by directly raising and lowering the sound absorbing material supporting means for supporting the sound absorbing material.

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