JP3776607B2 - Oil separation mechanism of oil supply type compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an oil separation device for an oil supply type compressor.
[0002]
[Prior art]
In recent years, oil supply type compressors are widely used in various fields. An example of such an oil supply type compressor will be described with reference to FIGS. FIG. 4 is a longitudinal sectional side view showing an example of a conventional oil supply compressor, and FIG. 5 is a cross-sectional view showing an example of a conventional oil separation mechanism of the oil supply compressor. In the figure, the flow of compressed air before oil is removed is indicated by solid arrows, and the flow of compressed air after oil is removed is indicated by dotted arrows.
[0003]
In the oil supply type compressor 101, the sucked air is compressed by the compressor body 102. At this time, oil is sucked from the oil tank 104 connected to the compressor main body 102 via the oil supply passage 103 by the negative pressure generated in the compressor main body 102. As a result, the compressor body 102 is lubricated, sealed, and cooled, but the compressed compressed air contains oil. If compressed air containing oil is sent to a compressed air supply destination as it is, problems such as adhesion of oil and generation of oil odor occur at the compressed air supply destination. For this purpose, the compressed air exhausted from the compressor main body 102 passes through the oil tank 104 once, then passes through the filter 106 provided in the filter device 105, and the oil that could not be removed by the oil tank 104. Two-stage oil separation is performed to remove the oil.
[0004]
The oil tank 104 and the filter device 105 are connected via a bent pipe 107, and the compressed air is discharged from a discharge port 108 formed on a wall surface below the filter device 105. The compressed air discharged to the filter device 105 goes around the entire circumference of the filter 106 and passes through the filter 106, and only the compressed air is supplied to the compressed air supply destination.
[0005]
[Problems to be solved by the invention]
However, the flow rate of the compressed air that passes through the filter 106 is faster near the discharge port 108, and becomes slower as it moves away from the discharge port 108. The higher the flow rate of the compressed air that passes through the filter 106, the lower the oil separation performance. . The difference in the flow velocity of compressed air generated in each part of the outer peripheral surface of the filter 106 becomes a difference in the degree of oil separation in each part of the outer peripheral surface of the filter 106, and uniform separation is not performed on the entire periphery of the filter 106. There is a problem that the separation efficiency is lowered. Further, depending on the position where the discharge port 108 is formed, high-speed compressed air flows only into a portion of the filter 106 close to the discharge port 108. For this reason, there is a problem that the entire circumference of the filter 106 is not effectively used for oil separation, and the separation efficiency of the filter 106 is reduced. Further, there is a problem that the filter 106 near the discharge port 108 where compressed air is concentrated and discharged is so deteriorated that the life of the filter 106 is shortened.
[0006]
On the other hand, since the oil tank 104 and the filter device 105 are connected via the bent pipe 107, the oil separated from the compressed air tends to stay in the middle of the path between the oil tank 104 and the filter 106. . Then, when the supply of compressed air is restarted, the oil staying in the path is blown away by the compressed air discharged from the oil tank 104, and more oil is separated by the filter 106. There arises a problem that the separation efficiency is further reduced.
[0007]
An object of this invention is to improve the isolation | separation efficiency of the oil contained in compressed air.
[0008]
SUMMARY OF THE INVENTION An object of the present invention is to make oil separation uniformly by the entire circumference of the filter, prevent the filter from being locally degraded, and extend the life of the filter.
[0009]
[Means for Solving the Problems]
The invention according to claim 1 is an oil tank that stores oil to be supplied to the compressor body and is supplied with compressed air compressed by the compressor body, and is disposed above the oil tank and has compressed air inside A filter device including a cylindrical filter for filtration; a discharge port of compressed air provided on an upper surface of the oil tank; and the discharge port and the filter device connected to each other and discharged from the oil tank. The filter and the discharge passage are formed so that the discharge passage formed in a straight tube for guiding compressed air to the filter device and the distance between the filter and the discharge passage are equal over the entire circumference of the filter. A connecting passage to be connected; and a colliding object provided in a portion of the discharge passage that is located immediately above the discharge port and with which the compressed air discharged from the oil tank collides . Here, the entire circumference of the filter does not mean the entire outer peripheral surface of the filter, but means the circumference of the filter in a plane orthogonal to the axial direction.
[0010]
Therefore, by providing the connection passage, the length between the oil tank and the filter becomes equal over the entire circumference of the filter, and the compressed air discharged toward the filter uniformly flows around the entire circumference of the filter.
[0012]
The oil separated from the compressed air staying in the discharge passage when the compression operation is stopped is lowered by gravity in the discharge passage extended in the vertical direction and does not stay in the middle of the route. Fall into the tank.
[0014]
Furthermore, the oil mixed in the compressed air is separated from the compressed air by the impact when the compressed air discharged from the oil tank collides with the collision object, and the separated oil falls into the oil tank as it is. For this reason, the amount of oil to be separated by the filter is reduced.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a longitudinal side view showing an oil supply type compressor according to an embodiment of the present invention, FIG. 2 is a longitudinal side view showing an oil separation mechanism of the oil supply compressor according to an embodiment of the present invention, and FIG. These are the cross-sectional views of the filter apparatus of the oil supply type compressor of one embodiment of the present invention. In the figure, the flow of compressed air before oil is removed is indicated by solid arrows, and the flow of compressed air after oil is removed is indicated by dotted arrows.
[0018]
As shown in FIG. 1, an oil supply type compressor 1 shown in the present embodiment includes an oil tank 2 that stores oil, a compressor body 3 that compresses sucked air, a motor 4 that drives the compressor body 3, and A filter device 5 for separating oil mixed in the compressed air from the compressed air is provided in the case 6.
[0019]
Two screws (not shown) are provided inside the compressor body 3. An endless belt 10 is stretched between a pulley 7 attached to one screw shaft protruding from the compressor body 3 and a pulley 9 attached to a drive shaft 8 of the motor 4. Further, a fan 11 is attached to the drive shaft 8, and a cooler 12 that cools compressed air that has been compressed and heated to a high temperature is provided at a position facing the fan 11. In addition to this, an air dryer 13 for removing moisture in the cooled compressed air is provided in the case 6.
[0020]
The oil tank 2 and the compressor main body 3 of the oil supply type compressor 1 include an oil supply hose 14 in which oil stored in the oil tank 2 is supplied to the compressor main body 3, and compressed air compressed by the compressor main body 3. It is connected by an air supply hose 15 supplied to the oil tank 2. One end of the oil supply hose 14 is connected to an oil supply port 16 formed in the oil tank 2, and the other end is connected to an intake port 17 formed in the vicinity of the screw of the compressor body 3. When the air is compressed, oil is supplied from the suction port 17. Further, one end of the air supply hose 15 is connected to an exhaust port 18 formed on the exhaust side of the compressor body 3, and the other end is connected to an air supply port 19 formed on the wall surface above the oil tank 2. .
[0021]
The discharge port 20 formed directly above the oil tank 2 is connected to the filter device 5 via a joint 21 that is a discharge passage.
[0022]
The filter device 5 includes a bottomed cylindrical filter case 23 in which a supply port 22 connected to the joint 21 is formed at the bottom, and a filter cover 24 detachably provided on the filter case 23. A cylindrical filter 25 is held in the. A support member 26 as a collision object is provided directly above the supply port 22 on the inner peripheral portion of the filter case 23, and the support member 26 is fixed to the filter case 23 by ribs 27 extending in the radial direction of the filter case 23. The filter case 23 is integrated. An annular space 28 is formed between the inner peripheral surface of the filter cover 24 and the outer peripheral surface of the filter 25, and the annular space 28 is connected to the supply port 22 through a space 29 between the ribs 27 and 27. Connected. A connection space 30 from the supply port 22 to the filter 25 serves as a connection passage, and the connection space 30 has an equal path length from the supply port 22 to the entire circumference of the filter 25. Furthermore, one end of a pipe 31 supported by the support member 26 is provided on the inner peripheral portion of the filter 25. The other end of the pipe 31 faces the outside of the filter case 23.
[0023]
And the other end of the hose 32 whose one end is connected to the cooler 12 is connected to the pipe 31 facing the outside. One end of a hose 33 is connected to the cooler 12, and the other end of the hose 33 is connected to the air dryer 13.
[0024]
In such a configuration, when a switch (not shown) is turned on and the motor 4 is driven, the drive shaft 8 rotates. The driving force of the drive shaft 8 is transmitted to the screw through the endless belt 10, and the compressor body 3 is started. Further, the fan 11 attached to the drive shaft 8 rotates and blows air toward the cooler 12.
[0025]
In the compressor body 3, the suctioned air is compressed by the rotation of the screw. Due to this compression, a negative pressure is generated inside the compressor body 3, and oil is sucked from the suction port 17 by the generated negative pressure. For this reason, oil is contained in the compressed air that has been compressed, and this compressed air is once exhausted from the exhaust port 18 to the oil tank 2. The compressed air exhausted to the oil tank 2 is pushed by the subsequently exhausted compressed air, is pushed out from the discharge port 20, and is discharged from the supply port 22 to the filter device 5 via the joint 21. The discharged compressed air collides with the lower end surface of the support member 26 and is separated from the oil by the impact at the time of the collision. As a result, a certain amount of oil is separated before the filter 25, so that the amount of oil separated by the filter 25 is reduced. Then, the compressed air after the collision flows around the entire circumference of the filter 25 through the annular space 28. At this time, since the connection space 30 has an equal path length from the supply port 22 to the entire circumference of the filter 25, the compressed air uniformly flows into the annular space 28 along the entire circumference of the filter 25. Pass through.
[0026]
On the other hand, the oil separated by the collision with the lower end surface of the support member 26 falls to the oil tank 2 along the inner peripheral surface of the joint 21 by gravity because the joint 21 extends in the vertical direction. In addition, when the supply of compressed air is stopped, the oil separated from the compressed air staying in the joint 21 falls in the oil tank 2 through the joint 21 in the same manner. For this reason, the oil does not stay between the oil tank 2 and the filter device 5, so that excessive oil may circulate around the filter 25 even when the supply of compressed air is resumed. Absent.
[0027]
The compressed air that has passed through the filter 25 is guided from the pipe 31 to the cooler 12 via the hose 32. The compressed air that has been compressed to a high temperature is cooled by the air blown by the fan 11 and circulated to the air dryer 13 via the hose 33. The compressed air is supplied to a compressed air supply destination (not shown) after moisture contained in the compressed air is removed by the air dryer 13.
[0028]
In addition, the oil separation mechanism of the oil supply type compressor of the present invention may be any structure as long as the compressed air discharged from the oil tank uniformly flows around the entire circumference of the filter, and the oil supply type compression shown in the present embodiment. It is not limited to the machine.
[0029]
【The invention's effect】
The present invention has an equal path length from the supply port to the filter over the entire circumference of the filter, so that the compressed air uniformly flows around the entire circumference of the filter. Separation efficiency can be improved. In addition, since the compressed air is made to uniformly travel around the entire circumference of the filter, it is possible to effectively separate the oil around the entire circumference of the filter and prevent the filter from being locally deteriorated, thereby extending the life of the filter. Can be long.
[0030]
In addition, when a filter device is arranged above the oil tank and the compression operation is stopped, the oil separated from the compressed air staying in the discharge passage is dropped into the oil tank without staying in the middle of the path. Since it did in this way, when supply of compressed air is restarted etc., the oil blown off by compressed air and isolate | separated with a filter is lose | eliminated, and it can improve isolation | separation efficiency.
[0031]
In addition, because the collision object that the compressed air collides with is just above the discharge port, and the oil is separated by the impact when the compressed air collides with the collision object, the amount of oil separated by the filter is reduced. The separation efficiency in the filter can be improved. Further, since the amount of oil separated by the filter is reduced, the deterioration of the filter is reduced and the life of the filter can be extended.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view showing an oil supply type compressor according to an embodiment of the present invention.
FIG. 2 is a longitudinal side view showing an oil separation mechanism of an oil supply type compressor according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view of a filter device of an oil supply type compressor according to an embodiment of the present invention.
FIG. 4 is a longitudinal side view showing an example of a conventional oil supply type compressor.
FIG. 5 is a cross-sectional view showing a conventional example of an oil separation mechanism of an oil supply type compressor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Oil supply type compressor 2 Oil tank 3 Compressor main body 5 Filter apparatus 20 Discharge port 21 Discharge passage (joint)
25 Filter 26 Colliding object (support member)
30 Connection passage (connection space)

Claims (1)

An oil tank that stores oil to be supplied to the compressor body and is supplied with compressed air compressed by the compressor body;
A filter device disposed above the oil tank and having a cylindrical filter for compressed air filtration therein;
A compressed air outlet provided on the upper surface of the oil tank;
A discharge passage formed in a straight tube for connecting the discharge port and the filter device to guide the compressed air discharged from the oil tank to the filter device;
A connection passage that connects the filter and the discharge passage so that the distance between the filter and the discharge passage becomes equal over the entire circumference of the filter;
A collision object that is provided in a portion of the discharge passage that is located directly above the discharge port and that collides with the compressed air discharged from the oil tank;
An oil separation mechanism for an oil-feeding compressor.

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