JPS5832729Y2 - Oil separator for oil-cooled rotary compressor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an oil separator for an oil-cooled rotary compressor.

The oil-cooled rotary compressor contains a large amount of oil mist in the discharge gas from the compressor, and is equipped with an oil separator to separate the oil mist from the discharge gas.

FIG. 1 shows a conventional oil-cooled rotary compressor equipped with an oil separator. In the figure, 1 is an oil-cooled screw compressor, and 2 is a screw rotor (hereinafter referred to as rotor) of the compressor.

The rotor 2 is directly connected to an electric motor 4 through a shaft coupling 3 and is driven by the electric motor 4.

Air is drawn into the compressor from the intake port of the compressor through the blockage valve 5, is compressed by the rotating rotor 2, and is sent to the discharge port 40.
It is discharged from the discharge pipe 6.

Oil for lubricating, sealing, and cooling the compressor is supplied from the oil supply lower into the compressor, and after lubricating, sealing, and cooling the compressor, it is discharged from the discharge pipe 40 to the discharge pipe 6 together with compressed air.

The mixed fluid of compressed air and oil discharged into the discharge pipe 6 enters the oil separator 8, where it is separated into air and oil.

The separated oil accumulates in the oil tank 12 at the bottom of the oil separator 8, and is guided from the oil outlet 41 through the oil supply pipe 19 to the oil cooler 18 by the pressure inside the oil separator, where it is cooled and then transferred to the compressor. The oil is returned to the oil supply lower through the oil supply pipe 20 connected to the oil supply pipe 20 and circulated.

On the other hand, clean air from which oil has been removed is discharged from the fluid outlet 16 of the oil separator 8, and is supplied to working equipment such as pneumatic tools through the pressure holding valve 17 and the valve 32, and is consumed.

The pressure holding valve 17 maintains the pressure inside the oil separator 8 so that the amount of oil supplied under pressure from the oil separator 8 to the compressor does not decrease, and so that oil separation within the oil separator 8 does not deteriorate. is maintained at a predetermined pressure (approximately 4 kg/cm2 in the case of a general-purpose compressor) or higher.

The air consumption of working equipment is reduced, and the pressure inside the oil separator 8 is reduced to the specified pressure (approximately 7 kg/cnn2 in the case of a general-purpose compressor).
), the blocking valve 5 closes to reduce or block the amount of air sucked into the compressor.

An air release valve 21 is provided between the fluid outlet 16 of the oil separator 8 and the pressure holding valve 17, and when the compressor is stopped, the air release valve 21 is opened to release the compressed air in the oil separator 8 to the atmosphere. This removes high-pressure air from the compressor discharge side and reduces the starting torque when restarting the compressor.

A fluid inlet 10 is provided in the upper side wall of the cylindrical container 9 of the conventional oil separator 8 shown in FIG.

The upper lid 15 of the cylindrical container 9 has an air release valve 21. Pressure holding valve 1
7 and a fluid outlet 16 connected to the valve 32, and an oil separation element 14 provided to cover the fluid outlet 16.
, an inner cylinder 11 circumferentially surrounding the oil separation element 14;
The oil separation element 14 is held by an upper lid 15, a lower lid 25, and a hanging bolt 24.

When the compressor is in operation, a mixed fluid of compressed air and oil discharged from the compressor discharge port 40 into the discharge pipe 6 enters the oil separator 8 from the fluid population 10 .

The mixed fluid entering the oil separator 8 has a slow flow rate in the space A between the cylindrical container 9 and the inner tube 11, and is subjected to the action of gravity to separate large oil particles.

The oil separated from the mixed fluid falls into an oil tank 12 at the bottom of the cylindrical container 9 and accumulates therein.

The mixed fluid that entered the space B between the inner cylinder 11 and the oil separation element 14 through the opening 1 at the lower end of the inner cylinder 11 was further separated from oil by the oil separation element 14, and became clean. Air is discharged from the fluid outlet 16 and supplied to the work equipment.

On the other hand, the oil separated by the oil separation element 14 and accumulated in the lower part 27 of the oil separation element 14 is removed from the lower lid 25.
is recovered to the suction side of the compressor through a recovery hole (not shown) provided in the .

Generally, in the above type of oil separator, when the oil separated in the oil separator falls into the oil tank 12, it entrains air and falls, so the air caught in the oil becomes fine bubbles and forms into the oil tank. Contained in 12 oils.

Further, since the inside of the oil separator is pressurized, a large amount of air is dissolved in the oil in the oil tank 12.

When the air consumption of working equipment increases rapidly during compressor operation, or when the air release valve 21 is opened when the compressor is stopped, the pressure inside the oil separator 8 will drop rapidly, causing the oil in the oil tank 12 to drop. The air contained in the oil and the air dissolved in the oil gasify and expand, and the oil tank 12 always contains a large amount of oil necessary for lubricating, sealing, and cooling the compressor. A so-called foaming phenomenon occurs in which a large amount of bubbles are generated.

When a conventional oil separator is downsized, the distance between the lower end of the inner cylinder 11 and the oil surface cannot be made sufficiently long, so the bubbles due to the forming phenomenon reach the lower end of the inner cylinder 11, causing the bubbles to fill the space. Parts A and B are penetrated upward.

The bubbles that have entered the space B follow the air flow and reach the oil separation element 14, and the bubbles that have entered the space A also follow the air flow, go around the opening 13 at the lower end of the inner cylinder 11, and reach the bottom of the opening 13. It reaches the oil separation element 14 while drawing in some foam.

These large amounts of bubbles are defoamed as they pass through the oil separation element 14 according to the air flow, and eventually a large amount of oil enters the inside of the oil separation element 14, and this oil is passed through the oil separator according to the air flow. 1- It causes trouble that it leaks outside.

For this reason, in the conventional oil separator, the distance between the lower end of the inner cylinder 11 and the oil surface cannot be reduced beyond a certain level, and a small and lightweight oil separator cannot be achieved.

The object of the present invention is to provide a small and lightweight oil separator for an oil-cooled rotary compressor that does not cause the above-mentioned troubles.

The present invention consists of an intake port for sucking gas, an oil supply port for supplying oil for lubrication, sealing, and cooling of the compressor into the compressor, and a mixed fluid of compressed gas and oil supplied from the oil supply port. An oil separator for an oil-cooled rotary compressor is provided with a discharge port for discharging the water to the outside of the compressor, the oil separator includes a vertical cylindrical container with an open top end, and a discharge port disposed at the top of the cylindrical container. a fluid inlet that communicates with the cylindrical container, an upper lid provided on the upper part of the cylindrical container to cover the opening, a fluid outlet provided in the upper lid, and an oil separation element provided to cover the fluid outlet; an inner cylinder provided to surround the oil separation element; an oil tank at the bottom of the cylindrical container for storing oil for lubricating, sealing, and cooling the compressor; and an oil filler port at the bottom of the oil tank. In an oil separator for an oil-cooled rotary compressor configured with a communicating oil outlet, between the oil separation element and the oil tank,
By installing a truncated conical plate with an opening in the center in a medium-low position, it extinguishes the foam caused by the foaming phenomenon and prevents the foam from rising, preventing the foam from reaching the oil separation element. This is a small and lightweight oil separator for an oil-cooled rotary compressor that does not cause the above-mentioned troubles.

The present invention will be explained in detail below based on the drawings.

FIGS. 2 and 3 show an embodiment of the present invention, with FIG. 2 being a longitudinal sectional view thereof, and FIG. 3 being a sectional view taken along the line II in FIG. 2.

Note that the same symbols are used for the same parts as in FIG.

As shown in FIGS. 2 and 3, the oil separator of the present invention is provided with a fluid port 10 communicating with the outlet of the upper side wall compressor of the cylindrical container 9 of the oil separator 8, and the cylindrical container 9 A fluid outlet 16 is provided on the upper lid 15 of the cylindrical container 9, an oil separation element 14 is provided to cover the fluid outlet 16, and an inner cylinder 11 is provided to circumferentially surround the element 14. Machine lubrication.

An oil tank 12 is provided to store oil for sealing and cooling.
An oil outlet 41 is provided at the bottom of 2 to communicate with the oil supply port of the compressor.

The oil separation element 14 is held by an upper lid 15, bolts 24 and a lower lid 25.

A pressure retention valve 17 and a valve 32 are connected to the fluid outlet 16,
A release valve 21 is connected between the fluid outlet 16 and the pressure holding valve 17.

A partition plate 29.31 is provided in a space A between the circumferential container 9 and the inner cylinder 11 so as to surround the fluid population 10, and a passage 35 is formed by the partition plate 29.31.

The partition plate 31 is provided so that the fluid entering the space A from the fluid port 10 swirls in a certain direction within the space A, that is, so as to close one end of the passage 35 near the fluid port 10.

The partition plate 29 is provided so that the fluid that enters the space A from the fluid population 10 does not flow into the space B, which is the inside of the inner cylinder 11, for a certain section from the opening 13 at the lower end, but instead rotates.

The inner cylinder 11 is provided with an inlet 34 into which the fluid swirling within the space A flows, and a reinforcing wire mesh 30 is attached to the inlet 34.

The opening position of the inflow port 34 is the position where the fluid entering the space A from the fluid port 10 goes around the space A and enters the inner cylinder 11, that is, the fluid port 1 of the partition plate 31.
0 and close to the partition plate 31.

A truncated conical plate 28 is provided between the oil separation element 14 and the oil tank 12 at the bottom of the oil separator 8 in a medium-low position,
An opening 36 is provided in the central portion of the conical plate 28.

A mixed fluid of compressed air and oil discharged from the compressor into the discharge pipe 6 enters the passage 35 from the fluid port 10.

The mixed fluid that has entered the passage 35 is swirled in a certain direction and passes through the passage 35 for a certain section, during which oil is separated.

The mixed fluid flowing into the space A from the passage 35 flows into the inner cylinder 1.
It enters the space portion B through the inlet 34 in the side wall of No. 1 and the opening 13 at the lower end.

Here, since the inlet 34 is opened at a position opposite to the fluid inlet 10 and close to the partition plate 31 with respect to the partition plate 31, the mixed fluid entering the space part B from the inlet port 34 enters the space part A. , making sure to separate the oil thoroughly during this time.

The mixed fluid swirling and descending within the space portion A is guided by a truncated conical conical plate 28 provided in a medium and low position, and spirally descending (as shown in FIG. 2), forming a conical shape. It turns around near the opening 36 of the plate 28, and enters the space B through the opening 13 at the lower end of the upper inner cylinder, which rises as a forced whirlpool.

During this time, the oil is centrifuged from the mixed fluid.

The mixed fluid that has entered space B is oil separation element 1.
4, the oil is further separated, and clean air is supplied from the fluid outlet 16, through the pressure holding valve 17, and the valve 32 to the working equipment for consumption.

The oil separated by the oil separation element 14 and accumulated in the lower part 27 of the oil separation element 14 is recovered to the suction side of the compressor through a recovery hole (not shown) provided in the lower lid 25.

Note that the oil separated by the passage 35, the space A, and the wire mesh 30 falls on the conical plate 28, falls through the opening 36 of the conical plate 28, and accumulates in the oil tank 12.

The oil accumulated in the oil tank 12 is forced by the pressure in the oil separator 8 from the oil outlet 41 through the oil supply pipe 19 to the oil cooler, cooled, and then supplied to the compressor.

When the compressor is in operation, the air consumption of working equipment increases rapidly, or when the air release valve 21 is opened when the compressor is stopped, the pressure within the oil separator 8 decreases rapidly.

Since a large amount of oil for lubricating, sealing, and cooling the compressor is always stored in the oil tank 12, a so-called foaming phenomenon occurs and a large amount of bubbles are generated.

These bubbles rise from the oil surface and reach the conical plate 28,
The flow velocity of the air flowing through the opening 36 of the conical plate 28 becomes very large as the pressure in the oil separator decreases, so the bubbles that collect near the opening 36 are extinguished by this air flow. Also, the conical plate 2 provided in the middle and low state
8 prevents bubbles from rising, so that almost no bubbles enter the upper part of the conical plate 28.

In this way, in the oil separator of the present invention, even if the oil separator is made small, the conical plate can prevent the rise of foam caused by the foaming phenomenon and can also eliminate foam.
No bubbles will enter the spaces A and B, and therefore no large amount of oil will flow out of the oil separator.

As a result of experiments, in an oil-cooled screw compressor with a discharge air volume of 3.3 m3/min, conventional oil with an inner diameter of 35 Qmnl, a height of 280 mm from the bottom of the cylindrical container to the oil surface, and a height of the oil separator of 640 mm. In the separator, in order to prevent the bubbles generated by the forming phenomenon from reaching the oil separation element, the distance from the bottom end of the inner cylinder to the oil surface was required to be at least 180 mm, but in the oil separator of the present invention, The distance could be set to 140 mm.

This will increase the height of the oil separator from 640mm to 600m.
m, and the oil separator could be made smaller and lighter.

As described above, the present invention has a very large implementation effect.

As described in detail above, the present invention includes an intake port for sucking gas, an oil supply port for supplying oil for lubricating, sealing, and cooling the compressor into the compressor, and a supply port for supplying compressed gas and oil from the oil supply port. A separator for an oil-cooled rotary compressor is provided with a discharge port for discharging mixed fluid with oil to the outside of the compressor, and the separator includes a vertical cylindrical container with an open top end, and an upper part of the cylindrical container. a fluid inlet communicating with the discharge port, an upper lid provided at the top of the cylindrical container to cover the opening, a fluid outlet provided in the upper lid, and an oil provided to cover the fluid outlet. Lubricating the compressor at a separating element, an inner cylinder provided to surround the separating element, and a lower part of the cylindrical container;
An oil separator for an oil-cooled rotary compressor comprising an oil tank for storing oil for sealing and cooling, and an oil outlet communicating with the oil supply port at the bottom of the oil tank, the oil separation element and the oil tank. A truncated cone-shaped conical plate with an opening in the center is installed in a medium-low position between the two, so that bubbles generated by the forming phenomenon can be extinguished by the conical plate and the bubbles can be prevented from rising. Therefore, bubbles do not reach the oil separation element, and troubles such as oil leaking out of the oil separator can be reliably prevented, and the oil separator can be made small and lightweight.

Although the present invention does not necessarily require a structure in which the mixed fluid entering the oil separator is swirled in a fixed direction as shown in the above embodiment,
If the conical plate of the present invention is installed in an oil separator that has a structure in which the mixed fluid that enters the oil separator is swirled in a fixed direction, the mixed fluid that is swirling and descending inside the oil separator will be guided by the conical plate and will spiral downward. After swirling downward in a shape, it rises in a forced whirlpool and reaches the oil separation element, so that the oil is efficiently centrifuged from the mixed fluid, and the mixture that enters from the fluid inlet is sent to the oil separation element. This has the effect of improving the oil separation effect because the route and transit time can be lengthened.

Furthermore, by providing the conical plate, it is possible to prevent the fluid flowing in from the fluid tank 10 from acting directly on the oil level of the oil tank 12, so that the oil level of the pond tank 12 is stabilized, and the oil level of the oil tank, which has often occurred in the past, can be prevented. It is also possible to prevent problems such as a drop in oil separation efficiency due to the scattering of oil from the debris.

[Brief explanation of drawings]

FIG. 1 shows an oil-cooled rotary compressor equipped with a conventional oil separator. FIGS. 2 and 3 show an embodiment of the present invention, with FIG. 2 being a longitudinal sectional view thereof, and FIG. 3 being a sectional view taken along the line II in FIG. 2. 7...Oil filler port, 8...Oil separator, 9.
... Cylindrical container, 10 ... Fluid inlet, 1
1... Inner cylinder, 12... Oil tank, 13...
...Opening, 14...Oil separation element,
15... Upper lid, 16... Fluid outlet, 28... Conical plate, 29... Partition plate,
30...wire mesh, 31...partition plate, 34
...Inlet, 35...Passway, 36...
...Opening, 40...Discharge port, 41...
・Oil outlet.

Claims (1)

[Claims for Utility Model Registration] Lubrication and sealing of the air intake port and the compressor. An oil-cooled rotary compressor equipped with an oil supply port that supplies cooling oil into the compressor, and a discharge port that discharges a mixed fluid of compressed gas and oil supplied from the oil supply port to the outside of the compressor. An oil separator comprising: a vertical cylindrical container with an open top; a fluid inlet communicating with the discharge port at the top of the cylindrical container; an upper lid provided, a fluid outlet provided on the upper lid, an oil separation element provided to cover the fluid outlet, an inner cylinder provided to surround the oil separation element, and the cylindrical container. At the bottom of the compressor, lubrication and sealing. In an oil separator for an oil-cooled rotary compressor, the oil separator is comprised of an oil tank for storing cooling oil and an oil outlet communicating with the oil filler port at the bottom of the oil tank, between the oil separation element and the oil tank. An oil separator for an oil-cooled rotary compressor, characterized in that a truncated conical plate with an opening in the center is provided in a medium-low position.