JPS6411323B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an oil degassing device for removing air bubbles, moisture, etc. contained in oil.

[Prior art]

BACKGROUND ART In a detection instrument such as a differential pressure gauge, the liquid sealed inside the instrument for pressure transmission, such as silicone oil, must at least be free of air bubbles. That is, the volume of such bubbles changes drastically due to pressure, and it is not preferable to use a detection instrument that extracts pressure as a displacement of silicone oil. Similarly, water contained in silicone oil also tends to evaporate, which is detrimental to pressure transmission.

Therefore, the silicone oil used in the above-mentioned detection instruments etc. needs to be deaerated and dehydrated before being sealed in the instrument. Conventionally, the above-mentioned silicone oil is placed in a vacuum chamber and boiled under reduced pressure to remove air bubbles and moisture from the oil, but this is not very desirable in terms of efficiency. It took too much time to satisfy the content tolerance.

In other words, the removal amount of low boiling point components such as water contained in liquids such as silicone oil mentioned above is expressed as a function determined by temperature, pressure and time, where temperature is the main component of silicone oil. In order to promote its own thermal decomposition, it is necessary to prepare the fibers at a temperature below a predetermined temperature. Also, as mentioned above, it is necessary to shorten the time from an efficiency standpoint, and for this purpose a method of lowering the pressure inside the container is adopted. is added to the lower layer. Therefore, it is only in the surface layer of the oil in the container that a reduced pressure with the original atmosphere can be obtained, and even if appropriate stirring means are used, it is not possible to efficiently obtain oil with high purity. It was difficult to say that it was possible.

[Summary of the invention]

The present invention has been made in view of the above circumstances, and utilizes the bumping phenomenon caused by heating oil in a closed container under reduced pressure to pump oil into a small diameter pipe that rises upward from the pedestal of an oil pulling channel member. By using a simple structure that uses a batsuful to pull the oil up to the upper cavity side with a tubular part and overflow it, and to flow down this oil in a thin layer, air bubbles and moisture contained in the oil can be removed in a short time. To provide an oil degassing device that can efficiently remove oil and easily obtain high purity oil.

〔Example〕

Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

FIG. 1 is a principle explanatory diagram showing an embodiment of an oil degassing device according to the present invention, and in the figure, reference numeral 1 is
is a substantially cylindrical sealed container in which a liquid that requires deaeration and dehydration treatment, such as silicone oil 2, is placed, and an oil inlet 3 is connected to the upper end of the container via an on-off valve 3a.
An oil outlet 4 is also provided at the lower end of the container 1 via an on-off valve 4a.
Note that 5 in the figure is a filter for removing impurities such as dust contained in the oil 2.

6 is a heater disposed at the lower end of the container 1 and heats the bottom of the container to a predetermined temperature; 7 is connected to the upper end side of the container 1 and is connected to a vacuum pump (not shown) to heat the container 1.
An exhaust passage 9 is arranged so as to surround the upper end side of the container 1, and is arranged to surround the upper end side of the container 1, and to keep the upper chamber 8 in a reduced pressure state below a predetermined value, and to exhaust air bubbles, moisture, etc. removed from the oil 2. This is a cooler that circulates water.

Now, according to the present invention, the suction port 10 is opened with a diameter expanded downward at the lower end side of the oil 2 accumulated on the bottom side of the container 1 having the above-described structure.
a, and the discharge port 10b on the upper end side of the small diameter tubular part rises to the upper cavity 8 side above the oil surface.
It is characterized in that it is provided with an oil pulling flow path member 10 having a flow path member 10 and a baffle 11 that receives oil overflowing from the discharge port 10b of this flow path member 10 and fluidizes the oil in a thin layer state. are doing.

To explain this in detail, the flow path member 10 is made up of a pedestal 12 having an inverted dish shape with a downwardly expanding opening serving as a suction port 10a, and a pipe body 13 which is a small diameter tubular portion erected in the center of the pedestal 12. A baffle plate 14 having a substantially umbrella shape and forming the buffle 11 is attached and fixed to the outer circumferential portion of the pipe body 13. In addition, 15 in the figure is the pipe body 13.
The umbrella body is arranged above the discharge port 10b at the upper end to prevent oil from bumping, and is attached to the pipe body 13 or the inner wall of the container 1 by means of a stay (not shown) or the like. Furthermore, a hole 12a is provided on the lower end side peripheral wall of the pedestal 12 for taking oil 2 into the suction port 10a of the pedestal 12 from around the suction port 10a.
is formed as appropriate, but it is not necessarily limited to this, and it will be obvious that the lower end of the pedestal 12 may be placed a little apart from the bottom of the container 1.

In addition, in this embodiment, a plurality of umbrella-shaped buttful plates 14 constituting the above-mentioned buttful 11 are attached to the pipe body 1.
3 is attached and fixed to the outer periphery of the pipe body 13 to form a multi-stage configuration, and an inverted umbrella-shaped baffle plate 16 is disposed in the middle of these umbrella-shaped buffle plates 14, 14, so that the oil can flow in the radial direction of the pipe body 13. It is configured so that it flows down alternately in the centripetal direction and the time it takes to flow down in a thin layer can be extended. Here, it will be easily understood that this inverted umbrella-shaped buttful plate 16 is attached and fixed to the pipe body 13 or the container 1 side by means of a stay or the like (not shown).

According to the above-described configuration, the oil 2 in the channel member suction port 10a, which has been heated to a high temperature by the heater 6, sequentially boils, and a part of the low boiling point components such as water contained in the oil 2 is vaporized. At the same time, a portion of the oil 2 is vaporized and rises inside the pipe body 13 in the form of bubbles. Due to this bumping phenomenon of the oil 2, the oil 2 still in liquid form is also pushed up inside the pipe body 13 along with bubbles, and rises from the discharge port 10b at the upper end into the upper cavity 8 which is in a reduced pressure state. It will be overflowing. Of this overflowing oil 2, the vaporized oil 2 further rises inside the container 1 and goes into the cooler 9.
When the temperature is lowered in the vicinity, it liquefies and flows down along the inner wall of the container 1 and the like. It goes without saying that the area near the cooler 9 is set at a temperature that does not liquefy low-boiling components such as air bubbles and moisture that rise with the vaporized oil, and only the low-boiling components are exhausted from above the container 1.

On the other hand, the oil 2 that overflows from the discharge port 10b while remaining in liquid form is absorbed by the baffle 11 on the outer circumferential side of the pipe body 13.
At this time, the oil 2 flows in a thin layer, so the low boiling point components such as air bubbles and water remaining in the oil 2 are extremely vaporized. The oil is in a state where it is easily separated from the oil 2, vaporized, and discharged from the exhaust passage 7 above the container 1. In addition, the oil flowing down from this buffer 11 flows back into the oil 2 in the container 1, and by repeating this state, low boiling point components such as air bubbles and moisture in the oil 2 are separated and exhausted, and the oil 2 in the container 1 is The silicone oil 2, which has a high boiling point and high purity, remains.

That is, according to the present invention, the oil 2 in the container 1 is pulled upward while being sequentially stirred by utilizing the bumping phenomenon caused by the oil pulling channel member 10 and the heating means (heater 6), and the oil 2 in the container 1 is pulled upward while being sequentially stirred. This method removes low boiling point components such as air bubbles and water inside the layer by flowing it down in a layered state.In particular, it is degassed by heating to boiling with the heater 6 and is heated under reduced pressure.
By going through a two-step process of deaeration by flowing down the oil 2 in a thin film form, it is possible to reliably remove the low boiling point components in the oil 2.

A schematic configuration of the specific device is shown in FIG. is bypass path 2
2 are provided, and on-off valves 23 are provided in other parts as appropriate. Further, the container 1 is provided with a pressure detector 24 that detects the internal pressure of the upper chamber 8 inside the container 1 .

25 is a temperature controller that controls the heater 6, and has a temperature detector 26 and a temperature detection end 26a.
is provided so as to be able to detect the oil temperature within the pedestal 12 of the oil pulling flow path member 10.

In the above-mentioned apparatus, first, the rotary pump 21 is driven to reduce the pressure inside the container 1 via the bypass path 22, and at the same time, the bypass path 22 is closed in the middle, the diffusion pump 20 is driven, and both pumps 20, At step 21, the inside of the container 1 is maintained at a predetermined reduced pressure value.
Next, the heater 6 is heated by the controller 25, and air bubbles, moisture, etc. in the oil 2 can be removed by repeating the above-described operations.

In such a device, for example, when silicone oil (No. 704) is used, and the oil depth in container 1 is 20 mm, the permissible value of the contained gas is
It has been confirmed through experiments that it can be processed in about 20 minutes to achieve 1.82 PPM, which is less than 1/10 of the conventional processing time and has a great practical effect. The heating temperature in the above experiment was approximately 240℃,
The degree of pressure reduction is approximately 2×10 ^-3 Torr, and it has been confirmed that the appropriate height of the pipe body 13 of the oil pulling channel member 10 is 80 mm in the case of No. 704 silicone oil.

It goes without saying that the present invention is not limited to the structure of the embodiment described above, and that the shape, structure, etc. of each part can be modified and changed as appropriate. For example, Batsuful 1, where overflowing oil flows down in a thin layer.
1, a multi-stage structure as in the above-mentioned embodiment has a greater effect, but this may be one stage or multiple stages, and its shape may be modified as appropriate.

Furthermore, the oil degassing device according to the present invention can be effectively applied as a degassing device for various oils in addition to the silicone oil in the embodiments.

〔Effect of the invention〕

As explained above, according to the oil deaerator according to the present invention, oil is heated and boiled in a closed container under reduced pressure, and the bumping phenomenon is utilized to remove the oil from the small diameter of the oil pulling channel member. It is pulled up into the upper cavity of the container by the tubular part and overflowed,
Since this oil is made to flow down in a thin layer in the Batsuful, despite its simple structure, it can quickly and reliably remove air bubbles and water contained in the oil, and dehydrate it. High-purity oil can be obtained efficiently and easily in a short time, and the heating temperature for this treatment can be low, and there are no problems such as decomposition of the oil's main components.It has various excellent effects. be.

[Brief explanation of the drawing]

FIG. 1 is an enlarged view of essential parts of an embodiment of an oil degassing device according to the present invention, and FIG. 2 is a system diagram showing a specific schematic configuration thereof. 1... Airtight container, 2... Oil, 6... Heater (heating means), 7... Exhaust passage, 8... Upper empty space,
10...Oil pulling channel member, 10a...Suction port, 10b...Discharge port, 11...Bassful, 1
2... Pedestal, 13... Pipe body, 14... Umbrella-shaped buttful plate, 16... Reverse umbrella-shaped buttful plate, 20,2
1... Pump (pressure reducing means).

Claims (1)

[Scope of Claims] 1. A sealed container for enclosing oil, heating means for heating the bottom of the container to boil the oil, depressurizing means for reducing the pressure in the upper space of the container, and an airtight container for sealing oil in the bottom of the container. A flow path member for pulling up oil, which has a suction port opened with a downwardly expanded diameter at the bottom end of the pedestal, and has a discharge port at the top end of a small diameter tubular part that rises above the oil surface from the top end of the pedestal. , a baffle for receiving the oil overflowing from the discharge port on the upper end side of the tubular part of the flow path member and causing the oil to flow down in a thin layer; An oil degassing device characterized in that the oil is caused to rise within the tubular portion of the flow path member and overflow from the discharge port due to a bumping phenomenon caused by the oil on the side being boiled by the heating means. 2 The oil pulling channel member is composed of an inverted dish-shaped pedestal whose diameter expands downward and whose suction port is an opening, and a small-diameter pipe body erected in the center of the pedestal, forming a buttful. 2. The oil degassing device according to claim 1, wherein an umbrella-shaped baffle plate is attached and fixed to the outer circumferential portion of the pipe body. 3 A plurality of umbrella-shaped buttful plates are attached and fixed in multiple stages to the outer periphery of the pipe body forming the oil pulling channel member, and a reverse umbrella-shaped buttful plate is installed in the middle of each stage. 3. The oil degassing device according to claim 2, wherein the oil degassing device is arranged such that the oil degassing device is arranged such that the oil degassing device is provided with the oil degassing device.