JP6836892B2 - Moisture removal device in oil, water removal method in oil and vacuum pump system - Google Patents

Description

The present invention relates to an oil moisture removing device, an oil moisture removing method, and a vacuum pump system.

An oil-lubricated oil rotary vacuum pump is a typical example of equipment that uses oil. In this vacuum pump, water vapor is sucked into the vacuum pump together with air, and the water vapor is condensed and liquefied in the vacuum pump. The water accumulated in the vacuum pump due to the condensate can be drained by opening, for example, the drain valve provided in the vacuum pump. However, when oil and water are emulsified, the oil and water do not separate as continuous layers, making it difficult to remove the water from the vacuum pump.

Under such circumstances, there is a method of separating the emulsion generated in the vacuum pump into oil and water outside the vacuum pump and returning the oil in the emulsion to the vacuum pump (see, for example, Patent Document 1). In this method, the water in the emulsion is grown into large water droplets by passing the emulsion through an oil-water separation filter. Then, the oil and water are separated by utilizing the difference in specific gravity between the greatly grown water droplets and the oil.

Japanese Unexamined Patent Publication No. 06-193564

However, in the above method, an oil-water separation filter is provided in a container for containing oil, and water droplets are also dispersed in this container. Therefore, when the oil is recovered from this container, the water droplets dispersed in the oil may be recovered at the same time. Further, it takes a long time for a continuous layer of water to be stably formed under the oil in this container. Therefore, the oil cannot be easily recovered by this method.
As described above, the above method cannot easily recover the oil from the emulsion with a high recovery rate.

In view of the above circumstances, an object of the present invention is to provide an oil moisture removing device, an oil moisture removing method, and a vacuum pump system that can easily recover oil from an emulsion with a high recovery rate.

In order to achieve the above object, the oil-in-oil moisture removing device according to one embodiment of the present invention includes a first oil-water separation unit, a second oil-water separation unit, and a first pump.
The first oil-water separation unit is emulsified by passing a first liquid in which oil and water are emulsified through a filter. Here, the first liquid is taken from an instrument that uses oil. Then, the first oil-water separation unit can change the first liquid into a second liquid in a state of being separated into oil and water.
The second oil-water separation unit has a first storage chamber, a second storage chamber, and a hydrophilic oil-repellent sheet. The second containment chamber is located above at least a part of the first containment chamber and can be supplied with the second liquid. The hydrophilic oil-repellent sheet is arranged between the first storage chamber and the second storage chamber, and can selectively pass water in the second liquid.
The first pump can move the second liquid from the first oil-water separation unit to the second storage chamber of the second oil-water separation unit.
As a result, the oil in the emulsion collected from the equipment that uses the oil can be easily recovered with a high recovery rate.

The above-mentioned oil moisture removing device may further include a drain and a second pump.
The drain is connected to the first containment chamber and can drain the water contained in the first containment chamber.
The second pump can move the oil contained in the second storage chamber to the device.
As a result, the oil in the emulsion collected from the equipment that uses the oil is easily returned to the equipment with a high recovery rate.

In the above-mentioned oil-moisture removing device, the first pump may be provided downstream of the first oil-water separation section and may be provided upstream of the second oil-water separation section.
As a result, the first liquid does not directly pass through the first pump, and the first pump is less likely to deteriorate.

In the above-mentioned oil moisture removing device, the first storage chamber and the second storage chamber may be open to the atmosphere.
As a result, the water contained in the second liquid is stored in the first storage chamber by its own weight, and the oil is stored in the second storage chamber.

In the above-mentioned oil-moisture removing device, in the first oil-water separation unit, the filter may have a first filter and a second filter. The second filter may be provided upstream of the first filter. The first filter can change the first liquid into the second liquid. The second filter can remove sludge contained in the first liquid.
As a result, the sludge contained in the first liquid is removed by the second filter, and the second liquid having less sludge can be dropped onto the hydrophilic oil-repellent sheet.

In the above-mentioned oil moisture removing device, the second storage chamber has a supply port for supplying the second liquid and an oil drain port for discharging the oil in the second liquid. You may. The supply port may be provided at a position higher than the oil drain port. When the hydrophilic oil-repellent sheet is viewed from above, the hydrophilic oil-repellent sheet has a rectangular shape with the direction from the supply port to the oil drain port as the longitudinal direction.
As a result, the direction in which the oil in the second liquid flows on the hydrophilic oil-repellent sheet becomes substantially the same as the longitudinal direction of the hydrophilic oil-repellent sheet, and a sufficient area for using the hydrophilic oil-repellent sheet is secured.

In the above-mentioned oil moisture removing device, the hydrophilic oil-repellent sheet may be arranged obliquely with respect to a horizontal plane.
As a result, the oil in the second liquid is less likely to accumulate on the hydrophilic oil-repellent sheet, and a sufficient area for the water in the second liquid to come into contact with the hydrophilic oil-repellent sheet is secured.

In the above-mentioned oil-moisture removing device, the second oil-water separating portion may further have a retention suppressing mechanism for suppressing the retention of the second liquid on the hydrophilic oil-repellent sheet.
As a result, the oil in the second liquid is less likely to accumulate on the hydrophilic oil-repellent sheet, and a sufficient area for the water in the second liquid to come into contact with the hydrophilic oil-repellent sheet is secured.

Further, in order to achieve the above object, in the method for removing water in oil according to one embodiment of the present invention, a first liquid collected from an apparatus using oil and in an emulsified state of oil and water is used as a filter. It involves changing the first liquid into a second liquid that is separated into oil and water by passing it through and emulsifying.
A hydrophilic oil-repellent sheet capable of selectively passing water in the second liquid is used, and the water in the second liquid is transferred to the first storage chamber in the second liquid. The oil is distributed to the second containment chamber, respectively.
As a result, the oil can be easily recovered with a high recovery rate from the emulsified liquid collected from the equipment that uses the oil.

Further, in order to achieve the above object, the vacuum pump system according to one embodiment of the present invention includes a vacuum pump, a first oil-water separation unit, a second oil-water separation unit, a first pump, a drain, and the like. A second pump is provided.
The first oil-water separation unit is emulsified by passing a first liquid in which oil and water are emulsified through a filter. Here, the first liquid is taken from a vacuum pump. Then, the first oil-water separation unit can change the first liquid into a second liquid in a state of being separated into oil and water.
The second oil-water separation unit has a first storage chamber, a second storage chamber, and a hydrophilic oil-repellent sheet. The second containment chamber is located above at least a part of the first containment chamber and can be supplied with the second liquid. The hydrophilic oil-repellent sheet is arranged between the first storage chamber and the second storage chamber, and can selectively pass water in the second liquid.
The first pump can move the second liquid from the first oil-water separation unit to the second storage chamber of the second oil-water separation unit.
The drain is connected to the first containment chamber and can drain the water contained in the first containment chamber.
The second pump can move the oil contained in the second storage chamber to the vacuum pump.
As a result, with respect to the emulsified liquid collected from the vacuum pump, the oil is easily recovered with a high recovery rate, and this oil is returned to the vacuum pump.

As described above, according to the present invention, oil can be easily recovered from the emulsion with a high recovery rate.

It is a schematic block diagram which shows the structure of the moisture removal apparatus in oil which concerns on this embodiment. FIG. A is a schematic cross-sectional view showing a first oil-water separation portion according to the present embodiment. FIG. B is a diagram schematically showing the state of the emulsion before being passed through the first oil-water separation section. FIG. C is a diagram schematically showing the state of the emulsion after passing through the first oil-water separation section. FIG. A is a schematic cross-sectional view showing a cross section of the second oil-water separation portion according to the present embodiment. FIG. B is a schematic top view showing the upper surface of the second oil-water separation portion according to the present embodiment. A and B are schematic cross-sectional views showing the operation of the second oil-water separation unit according to the present embodiment. It is a schematic flow chart which shows the water moisture removal method in oil which concerns on this embodiment. FIG. A is a schematic cross-sectional view showing a first modification of the second oil-water separation portion according to the present embodiment. FIG. B is a schematic cross-sectional view showing a second modification of the second oil-water separation portion according to the present embodiment. FIG. A is a schematic cross-sectional view showing a third modification of the second oil-water separation portion according to the present embodiment. FIG. B is a schematic top view showing a third modification of the second oil-water separation portion according to the present embodiment. It is the schematic sectional drawing which shows the 4th modification of the 2nd oil-water separation part which concerns on this embodiment. It is a schematic sectional drawing which shows the 5th modification of the 2nd oil-water separation part which concerns on this embodiment. It is the schematic sectional drawing which shows the 6th modification of the 2nd oil-water separation part which concerns on this embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. XYZ axis coordinates may be introduced in each drawing.

[Configuration of water removal device in oil]
FIG. 1 is a schematic block diagram showing the configuration of the oil moisture removing device 1 according to the present embodiment.
The oil-in-oil moisture removing device 1 shown in FIG. 1 includes an oil-water separation unit 10 (first oil-water separation unit), an oil-water separation unit 20A (second oil-water separation unit), a pump 31 (first pump), and the like. A pump 32 (second pump), a flow path 41 (first flow path), a flow path 42 (second flow path), a flow path 43 (third flow path), and a drain 50 are provided. To do. Further, FIG. 1 shows a device 60 for which the water moisture removing device 1 in oil is used and which uses oil.

First, the overall outline of the oil moisture removing device 1 will be described.

In the oil-moisture removing device 1, the flow path 41, the oil-water separation unit 10, the flow path 42, the oil-water separation unit 20A, and the flow path 43 are connected in series in this order. The flow path 41 is connected between the device 60 and the oil-water separation unit 10. The flow path 42 is connected between the oil-water separation unit 10 and the oil-water separation unit 20A. The flow path 43 is connected between the oil-water separation unit 20A and the device 60. The flow paths 41, 42, 43 are made of, for example, resin or metal, and may be made of a flexible pipe. In the oil moisture removing device 1, the flow path 41 is the most upstream flow path, and the flow path 43 is the most downstream flow path. In FIG. 1, the direction of the liquid flowing in the water moisture removing device 1 in oil is indicated by an arrow.

The pump 31 is provided in the middle of the flow path 42. For example, the pump 31 is provided downstream of the oil-water separation unit 10 and upstream of the oil-water separation unit 20A. The pump 32 is provided in the middle of the flow path 43. For example, the pump 32 is provided downstream of the oil-water separation unit 20A. Pumps 31 and 32 are, for example, liquid transfer pumps such as diaphragm pumps, tube pumps and bimol pumps. Regarding the flow path 42, the flow path portion 42a is upstream from the pump 31, and the flow path portion 42b is downstream from the pump 31. Regarding the flow path 43, the flow path portion 43a is upstream from the pump 32, and the flow path portion 43b is downstream from the pump 32.

The flow path 41 is the first flow path for collecting the liquid emulsified by the device 60 (hereinafter, the emulsified liquid 1e (first liquid)). Here, the emulsified liquid 1e is a liquid in which oil and water are emulsified. The emulsion 1e is visually cloudy, for example. Then, when the pumps 31 and 32 are started, the oil-water separation unit 10 is sucked through the flow path 42, and the emulsified liquid 1e moves from the device 60 into the oil-water separation unit 10 via the flow path 41. When the emulsion 1e is supplied to the oil-water separation unit 10, the emulsion 1e is emulsified by the oil-water separation unit 10 to become a transparent liquid 1t (oil phase and water phase), and the flow path 42 is passed from the oil-water separation unit 10. It moves to the most downstream of the flow path 42 via the route. The transparent liquid 1t is, for example, transparent when viewed visually.

Here, the pump 31 provided in the middle of the flow path 42 can maintain the particle size distribution of the water 1w at the time of inhalation and discharge the water 1w and the oil 1o. That is, the pump 31 transfers the water 1w and the oil 1o from the flow path portion 42a to the flow path portion 42b while maintaining the particle size distribution of the water 1w in the flow path portion 42a. For example, even if water particles of 1 mm or less are newly generated in the water 1w that has passed through the pump 31, the particle size distribution of the water particles of 1 mm or less is 1% or less of the particle size distribution of the water 1w in the flow path portion 42b. is there. For example, when a population of 1000 or more water 1w flows from the upstream to the downstream of the pump 31, and a population of 1000 water 1w is arbitrarily collected downstream of the pump 31, the particle size is 1 mm or less. The rate of water 1w present is 1% or less (10 out of 1000) in the downstream population. Similarly, even if new oil particles of 1 mm or less are generated in the oil 1o that has passed through the pump 31, the particle size distribution of the oil particles of 1 mm or less is 1% or less of the particle size distribution of the oil 1o in the flow path portion 42b. Is. For example, when a population of 1000 or more oils 1o flows from the upstream to the downstream of the pump 31, and a population of 1000 oils 1o is arbitrarily collected downstream of the pump 31, the particle size is 1 mm or less. The rate of oil 1o present is 1% or less (10 out of 1000) in the downstream population. Such a particle size distribution of water 1w or oil 1o can be obtained by, for example, a laser diffraction method.

When the transparent liquid 1t is supplied to the oil-water separation unit 20A, the oil 1o and the water 1w contained in the transparent liquid 1t are distributed to the storage chambers 21 and 22 in the oil-water separation unit 20A, respectively. Then, by the operation of the pump 32, the oil 1o is returned to the device 60 from the storage chamber 22 in the oil-water separation unit 20A via the flow path 43. On the other hand, the water 1w is drained from the storage chamber 21 in the oil-water separation section 20A via the drain 50. When the oil-water separation section 20A and the flow path 43 are provided at a position higher than the device 60, the oil 1o is returned to the device 60 from the storage chamber 22 in the oil-water separation section 20A via the flow path 43 by its own weight. be able to. In this case, the pump 32 can be removed from the oil moisture removing device 1.

The device 60 is, for example, a device that uses oil for rust prevention, lubrication, vibration prevention, refrigerant, cooling, operation, and the like. The oil is, for example, an oil used for sealing purposes, a lubricating oil used for sliding parts, an oil for suppressing oxidative corrosion, a hydraulic oil used for hydraulic equipment, and the like. As an example, the device 60 is an oil-lubricated oil rotary vacuum pump. When the device 60 is an oil-lubricated oil rotary vacuum pump, examples of the oil include mineral oil and synthetic oil.

Further, when the device 60 is an oil-lubricated oil rotary vacuum pump, the vacuum pump system is configured by combining the device 60 and the oil moisture removing device 1. For example, when the emulsion 1e generated in the vacuum pump is collected by the oil moisture removing device 1, the oil 1o and the water 1w are separated in the oil moisture removing device 1, and the oil 1o is used in the oil rotary vacuum pump. Returned. Then, the water 1w contained in the emulsion 1e is drained through the drain 50.

Further, in the oil moisture removing device 1, the pump 31 may be provided not in the middle of the flow path 42 but in the middle of the flow path 41. However, since the sludge 1s contained in the emulsified liquid 1e is removed in advance by the oil-water separating portion 10 (described later), the pump 31 is preferably provided in the middle of the flow path 42. As a result, the emulsion 1e containing the sludge 1s does not directly pass through the pump 31, and the pump 31 is less likely to deteriorate.

Further, since the emulsion 1e has a higher specific gravity than the oil, it stays below the oil in the device 60. Therefore, it is desirable that the flow path 41 for sucking the emulsion 1e is connected to the bottom of the device 60, and the flow path 43 for returning the oil is connected to the upper part of the device 60.

Next, the details of the configuration of the oil-water separation unit 10 (first oil-water separation unit) and the oil-water separation unit 20A (second oil-water separation unit) constituting the oil-in-oil moisture removing device 1 will be described.

FIG. 2A is a schematic cross-sectional view showing the first oil-water separation unit 10 according to the present embodiment. FIG. 2B is a diagram schematically showing the state of the emulsion 1e before being passed through the first oil-water separation unit 10. FIG. 2C is a diagram schematically showing the state of the emulsion 1e after passing through the first oil-water separation unit 10. The arrow indicates the direction in which the liquid flows.

As shown in FIG. 2A, the oil-water separating portion 10 has a cylindrical tubular portion 15a, a disc-shaped upper lid 15b, a disc-shaped lower lid 15c, and a filter member 14. The filter member 14 includes a filter 12 (first filter), a filter 11 (second filter), and a filter 13 (third filter). The filter 11, the filter 12, and the filter 13 are arranged in this order in the Z-axis direction. For example, the filter 11 is provided upstream of the filter 12, and the filter 12 is provided upstream of the filter 13. Since the filter 13 is made of the same material as the filter 11 in the filter member 14, the filter 13 can be appropriately removed.

The lower lid 15c is connected to the flow path 41. The upper lid 15b is connected to the flow path portion 42a. The tubular portion 15a is connected to the upper lid 15b and the lower lid 15c. Each of the upper lid 15b and the lower lid 15c is removable to the tubular portion 15a. An O-ring may be appropriately provided between each of the upper lid 15b and the lower lid 15c and the tubular portion 15a.

In the oil-water separation portion 10, the cylinder portion 15a, the upper lid 15b, and the lower lid 15c function as a storage case. By removing either the upper lid 15b or the lower lid 15c from the tubular portion 15a, any of the filters 11, 12, and 13 housed in the tubular portion 15a can be easily replaced with a new one. The shape of the storage case shown is an example, and is not limited to this example.

The filters 11 and 13 contain, for example, a polyurethane resin. This polyurethane resin is, for example, foamed polyurethane. A filter 12, for example, a melamine resin is included. This melamine resin is, for example, melamine foam.

As shown in FIG. 2B, the emulsified liquid 1e immediately after being collected from the device 60 exists in the flow path 41 upstream of the oil-water separation unit 10. The emulsion 1e contains sludge 1s in addition to the emulsion 1e. Here, the sludge 1s is rust powder, worn metal powder, oil oxide, carbon powder, dust, etc. generated in the equipment 60. The sludge 1s is removed in advance by the filter 11 in the oil-water separation unit 10. As a result, the sludge 1s in the emulsion 1e is extremely reduced downstream of the filter 11.

Further, the filter 11 also functions as a layer for spreading the emulsion 1e in the tubular portion 15a in the X-axis direction and the Y-axis direction. For example, when there is no filter 11 and the filter 12 is arranged immediately downstream of the flow path 41, the emulsion 1e is affected by the flux formed in the flow path 41 and is near the center of the filter 12. Will pass through.

On the other hand, in the oil-water separation section 10 in which the filter 11 is arranged between the filter 12 and the flow path 41, the emulsified liquid 1e flowing out from the flow path 41 once spreads in the filter 11 in the X-axis direction and the Y-axis direction. Then, the emulsion 1e spread in the X-axis direction and the Y-axis direction flows into the filter 12. As a result, the emulsion 1e spreads evenly in the filter 12 and a sufficient volume used in the filter 12 can be obtained. The sludge 1s that was not removed by the filter 11 is removed by the filter 13. The pore diameter in the filter 13 may be smaller than the pore diameter in the filter 11.

When the emulsion 1e reaches the filter 12, for example, the minute water particles dispersed in the emulsion 1e are captured by the fibers of the melamine resin of the filter 12, aggregated, and eventually have a diameter larger than that of the minute water particles. It grows into large water droplets. Then, the liquid that has passed through the filter 12 and reached the flow path portion 42a becomes a transparent liquid 1t (second liquid) in a state of being separated into the oil 1o and the ball-shaped water 1w (FIG. 2C). ).

As described above, when the emulsified liquid 1e passes through the filter 12 of the oil-water separation unit 10, the emulsified liquid 1e is demulsified and the emulsified liquid 1e changes into a transparent liquid 1t separated into oil 1o and water 1w. Then, the transparent liquid 1t moves from the oil-water separation portion 10 to the most downstream of the flow path portion 42b via the flow path portion 42a by the operation of the pump 31. The transparent liquid 1t that has moved to the most downstream of the flow path portion 42b is not separated in the same container by utilizing the difference in specific gravity between water and oil, but is subjected to the hydrophilic oil-repellent sheet 23s described below. Oil 1o and water 1w are separated into separate storage chambers 21 and 22, respectively.

FIG. 3A is a schematic cross-sectional view showing a cross section of the second oil-water separation portion 20A according to the present embodiment. FIG. 3B is a schematic top view showing the upper surface of the second oil-water separation unit 20A according to the present embodiment.

As shown in FIG. 3A, the oil-water separating portion 20A includes a hydrophilic oil-repellent sheet 23s, a housing 25, an inclined plate 26, a support plate 27, a supply port 24a, an oil drain port 24b, and a drain port 24c. Has. The hydrophilic oil-repellent sheet 23s is housed in the housing 25. The outer circumference of the hydrophilic oil-repellent sheet 23s is held by the frame 23f. The hydrophilic oil-repellent sheet 23s may be supported by, for example, a net. The hydrophilic oil-repellent sheet 23s and the frame 23f are collectively referred to as a filter cartridge. Further, the shape of the housing 25 when viewed from above is rectangular (FIG. 3B). The shape of the housing 25 is not limited to a rectangular shape, and may be a circular shape.

The hydrophilic oil-repellent sheet 23s is, for example, a sheet through which water 1w in 1t of a transparent liquid can be selectively passed. The frame 23f supports the hydrophilic oil-repellent sheet 23s, and is itself supported by the locking portion 25l and the support plate 27 of the housing 25. From the portion where the frame 23f and the support plate 27 come into contact with each other, an inclined plate 26 is provided toward the supply port 24a.

Further, the oil-water separation portion 20A includes a storage chamber 21 (first storage chamber) surrounded by a housing 25, a support plate 27, and a hydrophilic oil-repellent sheet 23s, a housing 25, an inclined plate 26, and a hydrophilic oil-repellent sheet. It has a containment chamber 22 (second containment chamber) surrounded by 23s. The containment chamber 22 is located above at least a portion of the containment chamber 21. In the example of FIG. 3A, the accommodation chamber 22 is provided over the entire accommodation chamber 21. The containment chamber 21 and the containment chamber 22 are open to the atmosphere. The hydrophilic oil-repellent sheet 23s is arranged between the storage chamber 21 and the storage chamber 22. When the pump 31 operates, the transparent liquid 1t moves from the oil-water separation unit 10 to the storage chamber 22 via the flow path 42.

Further, the oil-water separation portion 20A has a space 28 surrounded by the housing 25, the inclined plate 26, and the support plate 27. Regarding the space 28, for example, it is possible to provide an opening in the support plate 27 and connect it to the storage chamber 21. In this case, the accommodation chamber 21 and the space 28 may be combined into the accommodation chamber 21.

The supply port 24a is provided in the accommodation chamber 22. The supply port 24a is connected to the flow path portion 42b. That is, the flow path portion 42b is connected to the accommodation chamber 22 via the supply port 24a. Further, the supply port 24a is located at a position higher than the oil drain port 24b and the inclined plate 26. For example, the lower end of the supply port 24a is located higher than the upper end of the inclined plate 26. The transparent liquid 1t that has reached the flow path portion 42b is supplied to the storage chamber 22 via the supply port 24a by the operation of the pump 31.

The oil drain port 24b is provided in the storage chamber 22. The oil drain port 24b is connected to the flow path portion 43a. That is, the flow path portion 43a is connected to the storage chamber 22 via the oil drain port 24b. The oil drain port 24b is located above the drain 50 and the hydrophilic oil repellent sheet 23s. For example, the lower end of the oil drain port 24b is positioned so as to be at the same height as the upper surface of the hydrophilic oil repellent sheet 23s.

The drainage port 24c is connected to the drain 50. The drain 50 is connected to the storage chamber 21 via the drain port 24c. For example, the lower end of the drainage port 24c is positioned so as to be at the same height as the upper surface of the bottom portion 25b of the housing 25.

The hydrophilic oil-repellent sheet 23s is a sheet having hydrophilicity and oil-repellent property. For example, in the hydrophilic oil-repellent sheet 23s, a hydrophilic and oil-repellent material (see, for example, Japanese Patent Application Laid-Open No. 2015-187220) is coated on glass fiber, PET (Poly-Ethylene-Terephthalate) fiber, etc. as a base material. It is a sheet that has been made. For example, water can permeate into the hydrophilic oil-repellent sheet 23s due to the hydrophilicity of the hydrophilic oil-repellent sheet 23s. On the other hand, the oil is repelled by the oil-repellent property of the hydrophilic oil-repellent sheet 23s and cannot penetrate into the hydrophilic oil-repellent sheet 23s.

When the hydrophilic oil-repellent sheet 23s is viewed from above, the hydrophilic oil-repellent sheet 23s has a rectangular shape (for example, a rectangle) with the direction from the supply port 24a to the oil drain port 24b as the longitudinal direction. That is, the longitudinal direction of the hydrophilic oil-repellent sheet 23s coincides with the direction from the supply port 24a to the oil drain port 24b (Y-axis direction). As a result, the direction in which the transparent liquid 1t flows on the hydrophilic oil-repellent sheet 23s becomes substantially the same as the longitudinal direction (Y-axis direction) of the hydrophilic oil-repellent sheet 23s, and the area where the hydrophilic oil-repellent sheet 23s is used is sufficient. Is secured in. If the direction in which the transparent liquid 1t flows on the hydrophilic oil-repellent sheet 23s is orthogonal to the longitudinal direction of the hydrophilic oil-repellent sheet 23s, the transparent liquid 1t flows in the lateral direction of the hydrophilic oil-repellent sheet 23s. The area where the hydrophilic oil-repellent sheet 23s is used cannot be sufficiently secured because it crosses the vicinity of the central portion of the surface.

4A and 4B are schematic cross-sectional views showing the operation of the second oil-water separation unit 20A according to the present embodiment.

For example, as shown in FIG. 4A, when the transparent liquid 1t is supplied to the storage chamber 22 from the supply port 24a, the transparent liquid 1t flows down along the inclined plate 26. 1 t of the transparent liquid is dropped onto the hydrophilic oil-repellent sheet 23s near the inclined plate 26. As a result, the transparent liquid 1t comes into contact with the hydrophilic oil-repellent sheet 23s near the inclined plate 26. Here, 1w of water in 1t of the transparent liquid has a higher specific gravity than oil 1o. As a result, the water 1w moves to the lower side of the oil 1o and comes into contact with the hydrophilic oil-repellent sheet 23s preferentially over the oil 1o. When the water 1w comes into contact with the hydrophilic oil-repellent sheet 23s, the water 1w in the transparent liquid 1t selectively passes through the hydrophilic oil-repellent sheet 23s due to the weight of the water 1w, and the water 1w moves from the storage chamber 22 to the storage chamber 21. Moving. That is, 1w of water in 1t of the transparent liquid is stored in the storage chamber 21.

On the other hand, the oil 1o cannot pass through the oil-repellent hydrophilic oil-repellent sheet 23s and remains on the hydrophilic oil-repellent sheet 23s. As a result, the oil 1o in the transparent liquid 1t is stored in the storage chamber 22. The hydrophilic oil-repellent sheet 23s has an oil-repellent effect on oil 1o. As a result, the oil 1o does not get wet with the hydrophilic oil-repellent sheet 23s, and when a force is applied to the oil 1o, the oil 1o is in a state where it can move on the hydrophilic oil-repellent sheet 23s.

As described above, in the present embodiment, the oil 1o and the water 1w are stored in the same storage chamber, and the oil 1o and the water 1w are not separated in the same storage chamber by utilizing the difference in specific gravity between the oil and the water. , Oil 1o and water 1w are separated by a hydrophilic oil-repellent sheet 23s, and oil 1o and water 1w are stored in separate storage chambers 21 and 22 respectively. It has been found that even if the emulsion 1e is directly dropped onto the hydrophilic oil-repellent sheet 23s, water does not fall under the hydrophilic oil-repellent sheet 23s.

Subsequently, as shown in FIG. 4B, when the new transparent liquid 1t is supplied to the storage chamber 22 from the supply port 24a, the water 1w in the new transparent liquid 1t is stored via the hydrophilic oil-repellent sheet 23s. Moving from the chamber 22 to the storage chamber 21, the oil 1o remains on the hydrophilic oil-repellent sheet 23s. Further, the new oil 1o applies a pressing force to the oil 1o already remaining on the hydrophilic oil-repellent sheet 23s. As a result, the oil 1o remaining in the storage chamber 22 flows in the direction from the supply port 24a toward the oil drain port 24b, and is discharged from the storage chamber 22 to the flow path portion 43a via the oil drain port 24b. Then, the oil 1o in the storage chamber 22 is sucked through the flow path portion 43a by the operation of the pump 32 and moves to the most downstream of the flow path portion 43b. Further, by the operation of the pump 32, the oil 1o moves to the device 60. On the other hand, the water 1w stored in the storage chamber 21 is discharged to the drain 50 via the drain port 24c.

In the present embodiment, a continuous layer of water (a layer in which water droplets are united) is formed under the oil layer in the same container, and the oil is not recovered from this container but separated by the oil-water separation unit 10. Both the oil 1o and the water 1w are supplied to the oil-water separation unit 20A, and the oil 1o and the water 1w are distributed to the separate storage chambers 21 and 22 by the hydrophilic oil-repellent sheet 23s in the oil-water separation unit 20A. As a result, the step of forming a continuous water layer under the oil layer can be omitted, and oil with higher purity can be recovered with a high recovery rate. Further, the purity of the water 1w drained to the drain 50 is high, and it is not necessary to remove the oil from the water 1w drained to the drain 50 again.

Further, in the oil-in-oil moisture removing device 1, the storage chambers 21 and 22 of the oil-water separation unit 20A are open to the atmosphere, and the water 1w in the transparent liquid 1t moves from the storage chamber 22 to the storage chamber 21 by its own weight. That is, the water 1w in the transparent liquid 1t moves from the storage chamber 22 to the storage chamber 21 without pressurizing the storage chamber 22.

For example, when the storage chamber 22 is pressurized to forcibly move the water 1w from the storage chamber 22 to the storage chamber 21, the oil 1o in the transparent liquid 1t may also pass through the hydrophilic oil-repellent sheet 23s together with the water 1w. On the other hand, in the oil moisture removing device 1, the accommodating chambers 21 and 22 are opened to the atmosphere, and the water 1w is moved from the accommodating chamber 22 to the accommodating chamber 21 by its own weight. As a result, the oil 1o is surely stored in the storage chamber 22 without passing through the hydrophilic oil-repellent sheet 23s. Further, the oil moisture removing device 1 does not require a complicated mechanism for adjusting the pressure in the storage chambers 21 and 22.

As described above, when the oil moisture removing device 1 is used, the oil in the emulsion collected from the device 60 that uses the oil can be easily recovered with a high recovery rate.

Further, the oil-water separating portions 10 and 20A are both small in size, and the filters 11, 12, 13 in the oil-water separating portion 10 and the hydrophilic oil-repellent sheet 23s in the oil-water separating portion 20A can be easily replaced. This facilitates maintenance of the oil moisture removing device 1.

[Method of removing water in oil]
The oil moisture removal device 1 described above follows the steps shown below. FIG. 5 is a schematic flow chart showing a method for removing water in oil according to the present embodiment.

First, the emulsified liquid 1e collected from the device 60 using oil is passed through the filter 12 to be emulsified, so that the emulsified liquid 1e is changed to a transparent liquid 1t in a state of being separated into oil 1o and water 1w. (Step S10).
Next, using the hydrophilic oil-repellent sheet 23s that allows the water 1w in the transparent liquid 1t to pass selectively, the water 1w in the transparent liquid 1t is stored in the storage chamber 21, and the oil 1o in the transparent liquid 1t is stored. Allocate to chambers 22 (step S20).
Next, the oil 1o stored in the storage chamber 22 is returned to the device 60, and the water 1w stored in the storage chamber 21 is discarded (step S30).
By such a method, the oil 1o is easily recovered with a high recovery rate from the emulsion 1e collected from the device 60.

[Modification example of the second oil-water separation part]
FIG. 6A is a schematic cross-sectional view showing a first modification of the second oil-water separation portion according to the present embodiment. FIG. 6B is a schematic cross-sectional view showing a second modification of the second oil-water separation portion according to the present embodiment.

In the oil-water separation portion 20B shown in FIG. 6A, the hydrophilic oil-repellent sheet 23s is arranged obliquely with respect to the horizontal plane (XY plane). For example, the hydrophilic oil-repellent sheet 23s is arranged so as to form a downwardly inclined surface in the direction from the supply port 24a to the oil drain port 24b. With such a structure, the oil 1o easily moves on the hydrophilic oil-repellent sheet 23s and is less likely to accumulate on the hydrophilic oil-repellent sheet 23s. As a result, a sufficient area for the water 1w to come into contact with the hydrophilic oil-repellent sheet 23s is secured, and the efficiency of using the hydrophilic oil-repellent sheet 23s increases.

Also in the oil-water separating portion 20C shown in FIG. 6B, the hydrophilic oil-repellent sheet 23s is arranged so as to be inclined downward in the direction from the supply port 24a to the oil drain port 24b. However, the oil-water separation portion 20C is not provided with the inclined plate 26 and the support plate 27. In the oil-water separation section 20C, the space 28 disappears, and the space under the hydrophilic oil-repellent sheet 23s becomes the storage chamber 21. With such a structure, the same effect as that of the oil-water separating unit 20B can be obtained, and the structure becomes even simpler than that of the oil-water separating unit 20B.

The oil-in-oil moisture removing device 1 having the oil-water separating section 20B or the oil-water separating section 20C is provided with a level gauge that can confirm that the hydrophilic oil-repellent sheet 23s is surely arranged diagonally with respect to the horizontal plane. May be good.

Further, the second oil-water separating portion may further have a retention suppressing mechanism for suppressing the retention of the transparent liquid 1t on the hydrophilic oil-repellent sheet 23s. A specific example thereof will be described below.

FIG. 7A is a schematic cross-sectional view showing a third modification of the second oil-water separation portion according to the present embodiment. FIG. 7B is a schematic top view showing a third modification of the second oil-water separation portion according to the present embodiment.

The oil-water separating portion 20D shown in FIGS. 7A and 7B has a plurality of fins 100 provided on the hydrophilic oil-repellent sheet 23s, and a rotating shaft 101. The outer shape of the hydrophilic oil-repellent sheet 23s in the oil-water separating portion 20D is, for example, circular. The rotating shaft 101 extends from the bottom 25b of the housing 25 toward the hydrophilic oil-repellent sheet 23s and penetrates the hydrophilic oil-repellent sheet 23s. The rotating shaft 101 is provided perpendicular to the hydrophilic oil-repellent sheet 23s.

The plurality of fins 100 can rotate about the rotation shaft 101. Each of the plurality of fins 100 is arranged at equal intervals about the rotation axis 101. Each of the plurality of fins 100 is distorted in an arc shape in the XY plane (FIG. 7B). Each of the plurality of fins 100 has a notched hole 100h. However, the present embodiment also includes a configuration in which the hole 100h is not provided. The fin 100 has water and oil repellency. The hole 100h faces the hydrophilic oil-repellent sheet 23s. Each of the plurality of fins 100 is not in contact with the hydrophilic oil repellent sheet 23s. For example, the hydrophilic oil-repellent sheet 23s and the fin 100 are separated from each other to the extent that the oil 1o does not stay on the hydrophilic oil-repellent sheet 23s.

The supply port 24a is provided at a position lower than the upper end of the fin 100. Further, in the examples of FIGS. 7A and 7B, the oil drain port 24b is provided at a position facing the supply port 24a. This arrangement is an example, and for example, the angle formed by the line connecting the supply port 24a and the rotating shaft 101 and the line connecting the oil drain port 24b and the rotating shaft 101 may be smaller than 180 degrees.

When the transparent liquid 1t is supplied from the supply port 24a in the oil-water separation unit 20D, the transparent liquid 1t pushes any side surface of the plurality of fins 100, and the plurality of fins 100 rotate about the rotation shaft 101. When the plurality of fins 100 rotate, the oil 1o sandwiched between the adjacent fins 100 in the rotation direction also moves in the rotation direction and moves to the oil drain port 24b. After that, the oil 1o is discharged to the flow path portion 43a via the oil drain port 24b. On the other hand, the water 1w passes through the hydrophilic oil-repellent sheet 23s due to its own weight and is stored in the storage chamber 21. Further, the water 1w is drained to the drain 50 through the drain port 24c.

Further, in the oil-water separation unit 20D, each of the plurality of fins 100 has a hole portion 100h, and when the plurality of fins 100 rotate, a vortex of oil 1o is generated under the fins 100. As a result, the oil 1o is less likely to stay on the hydrophilic oil-repellent sheet 23s.

By having such a mechanism, the oil 1o becomes easier to move on the hydrophilic oil-repellent sheet 23s, and is less likely to accumulate on the hydrophilic oil-repellent sheet 23s. As a result, a sufficient area for the water 1w to come into contact with the hydrophilic oil-repellent sheet 23s is secured, and the efficiency of using the hydrophilic oil-repellent sheet 23s is further increased. The plurality of fins 100 can also be rotated by an external drive source.

FIG. 8 is a schematic cross-sectional view showing a fourth modification of the second oil-water separation portion according to the present embodiment.

In the oil-water separating portion 20E shown in FIG. 8, the hydrophilic oil-repellent sheet 23s has a tubular shape. Both ends of the tubular hydrophilic oil-repellent sheet 23s are supported by annular holders 103a and 103b. The rotating shaft 102 penetrates into the tubular hydrophilic oil-repellent sheet 23s. The rotating shaft 102 is supported by the housing 25. The rotation shaft 102 is arranged so as to be oblique to the horizontal plane. For example, the rotating shaft 102 is arranged so as to descend in the direction from the supply port 24a to the oil drain port 24b. As a result, the tubular hydrophilic oil-repellent sheet 23s is also arranged so as to descend in the direction from the supply port 24a to the oil drain port 24b. The central axis of the tubular hydrophilic oil-repellent sheet 23s and the stop axis of the rotating shaft 102 coincide with each other. Further, the tubular hydrophilic oil-repellent sheet 23s is supported from the inside by a frame (not shown) attached to the rotating shaft 102.

In the oil-water separation unit 20E, the storage chamber 21 and the storage chamber 22 are separated by a tubular hydrophilic oil-repellent sheet 23s. That is, in the oil-water separation unit 20E, the inside of the tubular hydrophilic oil-repellent sheet 23s is the storage chamber 22. Then, the rotating shaft 102 is rotated about the central axis of the rotating shaft 102 by a drive source provided outside the oil-water separating portion 20E. As a result, the tubular hydrophilic oil-repellent sheet 23s rotates about the central axis of the hydrophilic oil-repellent sheet 23s.

Further, in the oil-water separation unit 20E, a part of the supply port 24a is inserted into the tubular hydrophilic oil-repellent sheet 23s. For example, a part of the supply port 24a is inserted into the tubular hydrophilic oil-repellent sheet 23s so as not to come into contact with the rotating shaft 102. Further, a part of the oil drain port 24b is inserted into the tubular hydrophilic oil repellent sheet 23s. A part of the oil drain port 24b is inserted near the lowest position of the slanted tubular hydrophilic oil repellent sheet 23s, for example.

When the transparent liquid 1t is supplied from the supply port 24a into the tubular hydrophilic oil-repellent sheet 23s (accommodation chamber 22), the oil 1o does not pass through the hydrophilic oil-repellent sheet 23s and is inclined and rotated. It moves along the inside of the sheet 23s to the oil drain port 24b. After that, the oil 1o is discharged to the flow path portion 43a via the oil drain port 24b. In the oil-water separating portion 20E, since the hydrophilic oil-repellent sheet 23s is inclined and rotating, the oil 1o is hard to collect in the tubular hydrophilic oil-repellent sheet 23s. The angular velocity of the tubular hydrophilic oil-repellent sheet 23s is adjusted so that the oil 1o does not pass through the hydrophilic oil-repellent sheet 23s due to centrifugal force.

On the other hand, the water 1w passes through the hydrophilic oil-repellent sheet 23s by its own weight or centrifugal force and is stored in the storage chamber 21. Then, the water 1w is drained to the drain 50 through the drain port 24c. In the oil-water separation unit 20E, the contact property of the water 1w with the hydrophilic oil-repellent sheet 23s is further improved by giving the water 1w a centrifugal force in addition to its own weight. As a result, the oil 1o and the water 1w are more efficiently separated by the hydrophilic oil-repellent sheet 23s.

FIG. 9 is a schematic cross-sectional view showing a fifth modification of the second oil-water separation portion according to the present embodiment.

In the oil-water separation portion 20F shown in FIG. 9, a spiral screw 105 is provided in a tubular hydrophilic oil-repellent sheet 23s that is inclined at an angle. The screw 105 is supported by a frame and a rotating shaft 102 that support the tubular hydrophilic oil-repellent sheet 23s. That is, when the tubular hydrophilic oil-repellent sheet 23s rotates, the screw 105 also rotates. Here, when the screw 105 is viewed from the supply port 24a, the screw 105 rotates clockwise. Further, the blades constituting the screw 105 have water and oil repellency. A part of the rotating shaft 102 is fitted to the oil drain port 24b. Further, the rotating shaft 102 around the holder 103b has a hole structure and a hollow structure for discharging the oil 1o to the oil drain port 24b.

When the transparent liquid 1t is supplied into the tubular hydrophilic oil-repellent sheet 23s from the supply port 24a, the oil 1o cannot pass through the hydrophilic oil-repellent sheet 23s. Further, the oil 1o swirls in the space separated by the blades of the screw 105 in the tubular hydrophilic oil-repellent sheet 23s. After that, the oil 1o reaches the vicinity of the holder 103b, which is downstream of the tubular hydrophilic oil-repellent sheet 23s. Then, the oil 1o is discharged to the oil drain port 24b and the flow path portion 43a via the inside of the rotating shaft 102.

In the oil-water separating portion 20F, since the hydrophilic oil-repellent sheet 23s is inclined and rotating, the oil 1o is hard to collect in the tubular hydrophilic oil-repellent sheet 23s. Further, the rotation of the screw 105 forcibly moves the oil 1o in the tubular hydrophilic oil-repellent sheet 23s, which makes it more difficult for the oil 1o to accumulate. On the other hand, the water 1w passes through the hydrophilic oil-repellent sheet 23s by its own weight or centrifugal force and is stored in the storage chamber 21. Then, the water 1w is drained to the drain 50 through the drain port 24c. As a result, the oil 1o and the water 1w are separated more efficiently.

FIG. 10 is a schematic cross-sectional view showing a sixth modification of the second oil-water separation portion according to the present embodiment.

In the oil-water separating portion 20G shown in FIG. 10, the tubular hydrophilic oil-repellent sheet 23s having the screw 105 is arranged so as to be perpendicular to the horizontal plane. That is, the longitudinal direction of the tubular hydrophilic oil-repellent sheet 23s having the screw 105 coincides with the vertical direction (Z-axis direction).

The supply port 24a is provided on the upper portion 25u of the housing 25. The rotating shaft 102 is supported by the upper portion 25u of the housing 25. A part of the rotating shaft 102 is fitted to an oil drain port 24b provided on the bottom 25b of the housing 25. Further, the rotating shaft 102 around the holder 103b has a hole structure and a hollow structure for discharging the oil 1o to the oil drain port 24b.

When the transparent liquid 1t is supplied into the tubular hydrophilic oil-repellent sheet 23s from the supply port 24a, the oil 1o does not pass through the hydrophilic oil-repellent sheet 23s, and the screw 105 is provided in the tubular hydrophilic oil-repellent sheet 23s. It swirls in the space separated by the blades of. Then, the oil 1o reaches the vicinity of the holder 103b, which is downstream of the tubular hydrophilic oil-repellent sheet 23s. After that, the oil 1o is discharged to the oil drain port 24b and the flow path portion 43a via the inside of the rotating shaft 102.

In the oil-water separating portion 20G, since the hydrophilic oil-repellent sheet 23s is rotating, the oil 1o is hard to collect in the tubular hydrophilic oil-repellent sheet 23s. Further, the rotation of the screw 105 forcibly moves the oil 1o in the tubular hydrophilic oil-repellent sheet 23s, which makes it more difficult for the oil 1o to accumulate. On the other hand, the water 1w passes through the hydrophilic oil-repellent sheet 23s by centrifugal force and is stored in the storage chamber 21. Then, the water 1w is drained to the drain 50 through the drain port 24c. As a result, the oil 1o and the water 1w are separated more efficiently.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made.

1 ... Moisture removal device in oil 1e ... Emulsified liquid 1s ... Sludge 1o ... Oil 1w ... Water 1t ... Clear liquid 10 ... Oil-water separation part 11, 12, 13 ... Filter 14 ... Filter member 15a ... Cylinder part 15b ... Top lid 15c ... Bottom Lid 20A, 20B, 20C, 20E, 20D, 20F, 20G ... Oil-water separation section 21, 22 ... Storage room 23s ... Hydrophilic oil-repellent sheet 23f ... Frame 24a ... Supply port 24b ... Oil drain port 24c ... Drain port 25 ... Housing 25b ... Bottom 25u ... Top 25l ... Locking part 26 ... Inclined plate 27 ... Support plate 28 ... Space 31, 32 ... Pump 41, 42, 43 ... Flow path 42a, 42b, 43a, 43b ... Flow path part 50 ... Drain 60 ... Equipment 100 ... Fins 100h ... Holes 101, 102 ... Rotating shafts 103a, 103b ... Holder 105 ... Screws

Claims (9)

The first liquid was separated into oil and water by passing a first liquid, which was taken from an oil-using device and in an emulsified state of oil and water, through a filter to deemulsify. A first oil-water separator that can be transformed into a second liquid that is in a state,
A first containment chamber, a second containment chamber located above at least a part of the first containment chamber and to which the second liquid can be supplied, the first containment chamber and the said A second containing a hydrophilic oil-repellent sheet arranged between the second storage chamber and capable of selectively passing water in the second liquid and arranged obliquely with respect to a horizontal plane. 2 oil-water separation part and
An oil-moisture removing device including a first pump capable of moving the second liquid from the first oil-water separation unit to the second storage chamber of the second oil-water separation unit. The device for removing water in oil according to claim 1.
A drain connected to the first containment chamber and capable of draining water contained in the first containment chamber,
An oil moisture removing device further comprising a second pump capable of transferring the oil contained in the second storage chamber to the device. The device for removing water in oil according to claim 1 or 2.
The first pump is an oil-moisture removing device provided downstream of the first oil-water separation unit and upstream of the second oil-water separation unit. The device for removing water in oil according to any one of claims 1 to 3.
The first containment chamber and the second containment chamber are oil moisture removing devices that are open to the atmosphere. The device for removing water in oil according to any one of claims 1 to 4.
In the first oil-water separation section, the filter is
A first filter capable of changing the first liquid into the second liquid,
It has a second filter capable of removing sludge contained in the first liquid, and has.
The second filter is an oil moisture removing device provided upstream of the first filter. The device for removing water in oil according to any one of claims 1 to 5.
The second storage chamber has a supply port to which the second liquid is supplied and an oil drain port from which the oil in the second liquid is discharged.
The supply port is provided at a position higher than the oil drain port.
When the hydrophilic oil-repellent sheet is viewed from above, the hydrophilic oil-repellent sheet is a rectangular oil removing device having a longitudinal direction from the supply port to the oil drain port. The first liquid was separated into oil and water by passing a first liquid, which was taken from an oil-using device and in an emulsified state of oil and water, through a filter to deemulsify. A first oil-water separator that can be transformed into a second liquid that is in a state,
A first containment chamber, a second containment chamber located above at least a part of the first containment chamber and to which the second liquid can be supplied, the first containment chamber and the said. A second oil-water separation section having a hydrophilic oil-repellent sheet arranged between the second storage chamber and capable of selectively passing water in the second liquid.
With a first pump capable of moving the second liquid from the first oil-water separation unit to the second storage chamber of the second oil-water separation unit.
Equipped with
The second oil-water separation unit further have a suppressing retention suppression mechanism of retention of the second liquid in the hydrophilic and oil-repellent sheet,
The retention suppressing mechanism has a rotating shaft penetrating the hydrophilic oil-repellent sheet and a plurality of fins provided on the hydrophilic oil-repellent sheet and rotatable about the rotating shaft.
The side surfaces of the plurality of fins are pushed by the second liquid supplied to the second storage chamber, and the plurality of fins rotate about the rotation axis, so that the second liquid becomes the plurality of fins. A device for removing water in oil that moves in the direction of rotation and suppresses the retention on the hydrophilic oil-repellent sheet. The first liquid was separated into oil and water by passing a first liquid, which was taken from an oil-using device and in an emulsified state of oil and water, through a filter to deemulsify. Change to a second liquid in the state,
The water in the second liquid can be selectively passed through, and the hydrophilic oil-repellent sheet arranged obliquely with respect to the horizontal plane is used to store the water in the second liquid in the first state. A method for removing water in oil, which distributes the oil in the second liquid to the chamber and to the second storage chamber. With a vacuum pump
The first liquid collected from the vacuum pump and in which oil and water are emulsified is passed through a filter to be emulsified, so that the first liquid is separated into oil and water. A first oil-water separator that can be transformed into a second liquid,
A first containment chamber, a second containment chamber located above at least a part of the first containment chamber and to which the second liquid can be supplied, the first containment chamber and the said A second containing a hydrophilic oil-repellent sheet arranged between the second storage chamber and capable of selectively passing water in the second liquid and arranged obliquely with respect to a horizontal plane. 2 oil-water separation part and
A first pump capable of moving the second liquid from the first oil-water separation unit to the second storage chamber of the second oil-water separation unit.
A drain connected to the first containment chamber and capable of draining water contained in the first containment chamber,
A vacuum pump system including a second pump capable of transferring oil contained in the second storage chamber to the vacuum pump.