JP2003065269A - Oil-sealed rotary vacuum pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil-sealed rotary vacuum pump that can solve an oil deterioration problem and effectively remove foreign matters remaining in a tank by improving oil being used and the construction of an oil tank. SOLUTION: In an oil-sealed rotary vacuum pump having an oil tank 1 which is equipped with an oil reservoir portion and an oil filter 5 and an oil discharge port 3 intercommunicating with the oil reservoir portion at the lower portion of the oil tank 1 and in which exhaust gas from the oil-sealed rotary pump is introduced into the oil tank 1 to discharge the exhaust gas while liquefying oil mist in the exhaust gas and make the liquefied oil flow into the oil reservoir portion, inert oil having large specific gravity is used as the oil and the oil filter 5 is disposed at a higher position than the oil level of the oil reservoir portion or substantially at the same height position as the oil level.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil rotary vacuum pump used in a laminating process in manufacturing a solar cell module.

[0002]

2. Description of the Related Art An oil rotary vacuum pump is often used as a vacuum generator in a laminating process performed in manufacturing a solar cell module, and an oil filled in an oil tank of this pump is generally used. Mineral oil is used in.

Further, as an oil tank of a conventional pump, the one illustrated in FIG. 2 has been used. That is, FIG.
In the above, 21 is an oil tank for accommodating an oil 22 composed of an appropriate amount of mineral oil in the oil sump at the bottom thereof, 23 is an oil discharge port provided at the bottom of the tank 21, 24 is an oil level gauge, and 25 is an oil level An oil filter installed in the lower part, 26 is an exhaust introduction port for introducing exhaust gas from the oil rotary pump into the tank 21, 27 is a lower guide wall, 28 is an upper guide wall, 29 is a top plate and an upper guide wall of the oil tank 21. An exhaust pipe installed between the exhaust pipe and the exhaust pipe, and 30 is an exhaust port. The exhaust gas from the oil rotary pump introduced into the oil tank 21 through the exhaust introduction port 26 advances between the guide walls 27 and 28 as shown by the arrow. In the exhaust pipe 29, the misted oil in the exhaust gas is liquefied and made to flow down onto the oil 22.

However, since the conventional oil rotary vacuum pump uses mineral oil as oil, it has the following problems. That is, in a laminating process of a solar cell module using an oil rotary vacuum pump, EVA (ethylene vinyl acetate) resin or the like used as a material of the cell module emits gas when pressurized and heated in a vacuum chamber. The generated gas deteriorates the oil 22 contained in the oil tank in the vacuum pump, which causes an increase in noise of the oil rotary pump and a failure of the pump. In order to prevent such a situation, it was necessary to frequently overhaul or change the oil.

[0005]

SUMMARY OF THE INVENTION In view of the above problems in an oil rotary vacuum pump used in a solar cell module laminating process and the like, an object of the present invention is to improve the oil used and the shape of the oil tank. It is an object of the present invention to provide an oil rotary vacuum pump that can solve the problem of deterioration and can effectively remove foreign matter accumulated in the tank.

[0006]

SUMMARY OF THE INVENTION The present invention has been made for the purpose of solving the above-mentioned problems, and its structure is such that an oil sump portion is provided at a lower portion of an oil tank in an oil rotary vacuum pump and the sump portion is connected to the oil sump portion. Oil rotary vacuum equipped with an oil tank that has an oil filter and an oil discharge port, and that exhausts from an oil rotary pump is introduced into this tank to liquefy the oil mist in the exhaust and let it flow down to the reservoir while exhausting it. In the pump, an inert oil having a large specific gravity is used as the oil, and the oil filter is installed above or almost at the same level as the oil surface of the oil reservoir. That is, in the oil rotary vacuum pump of the present invention, by using an inert oil as the oil, preferably a heavy inert oil having a specific gravity of about 2, the exhaust gas from the oil rotary pump contains gas and foreign matter. However, it is possible to suppress the deterioration of the oil due to the influence of the gas or foreign matter.

According to the present invention, in the above structure, the oil filter is installed above or substantially at the same level as the oil surface of the oil sump, so that the foreign matter accumulated on the upper layer of the oil in the oil sump due to having a smaller specific gravity than the oil. The oil can be efficiently removed, and the oil can be prevented from flowing out to the minimum when the filter is removed such as when the element of the oil filter is replaced. In addition, by installing a new upper oil discharge port almost at the same level as the oil level gauge, foreign matter that has been gravity-sorted with the oil and has come to the upper layer of the oil in the oil sump will be collected together with the oil in the upper layer that contains much of it. Can be effectively discharged.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view of an example of an oil tank in the oil rotary vacuum pump of the present invention.

An oil tank 1 has a large specific gravity in its bottom oil reservoir, for example, an inert oil having a specific gravity of about 2 is stored as an oil 2 for an oil rotary pump (not shown, the same applies hereinafter). A lower oil drain port provided at the bottom of the oil sump in the tank 1 is an oil level gauge for checking the amount of oil in the oil sump, and 5 is higher or almost equal to the oil level in the oil sump. Attached oil filter, 6
Is an exhaust inlet for introducing the exhaust gas from the oil rotary pump into the tank 1, 7 is a lower guide wall formed immediately above the oil surface of the oil in the oil sump inside the tank 1, 8
Is an upper guide wall above the wall 7, 9 is an exhaust pipe installed between the top plate 1a of the oil tank 1 and the upper guide wall 8, 10 is an exhaust port, and 11 is the same as the oil level gauge 4. The upper oil discharge port provided in the above constitutes an example of the oil tank in the oil rotary vacuum pump of the present invention. In the conventional oil tank 1, the demister provided at the inlets of the guide walls 7 and 8 is not installed in the present invention in order to remove foreign matters contained in the exhaust gas from the oil rotary pump. Foreign matter
This is because the upper drain port 11 or the oil filter 5 whose installation position has been devised is removed.

In the oil tank 1 described above, the exhaust gas from the oil rotary pump introduced into the tank 1 through the exhaust gas introduction port 6 is guided by the guide walls 7 and 8 and progresses as shown by the arrow.
The oil mist in the exhaust gas in the exhaust pipe 9 is liquefied and flows down onto the oil 2 in the oil reservoir, but the oil 2 for the oil rotary vacuum pump of the present invention is an inert oil. Therefore, the gas generated from EVA or the like in the exhaust gas is hardly deteriorated or does not deteriorate. Further, even if foreign matter is mixed in the exhaust gas and drops into the oil sump, the foreign matter collects in the upper layer of the oil 2 in the oil sump due to the difference in specific gravity between the foreign matter and the oil 2. be able to. As the oil 2, an inert oil is used, and for example, fluorine oil “BARRIERTAJ FLUID” manufactured by NOK Kluber Co. is suitable.

Thus, the oil 2 in the oil sump is filtered by the oil filter 5. In the present invention, however, the oil filter 5 is mounted above or substantially at the same level as the oil surface. The mixed foreign matter collected in the upper layer portion of the oil 2 can be effectively removed, and the outflow of the oil 2 can be minimized when the element of the oil filter 5 is replaced.

Further, in the present invention, since the upper oil drain port 11 is installed at the same height as the oil level gauge 4 separately from the lower oil drain port 3,
Foreign substances collected in the upper layer of the oil 2 can be effectively taken out of the tank. Furthermore, when replacing the oil, it is necessary to discharge all the oil as before and then fill the same amount of new oil. Since it is only necessary to replenish the same amount of oil as the oil reduced when the mixed foreign matter is discharged, it is possible to reduce the consumption of oil 2.

[0013]

Industrial Applicability Since the present invention is as described above, it is suitable as an oil rotary vacuum pump used for evacuation in the solar cell module laminating step, and
Even if the inert oil is more expensive than the mineral oil, the consumption can be reduced, so there is no big difference in running cost from the conventional oil rotary vacuum pump that uses the mineral oil. Does not increase the cost.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an example of an oil tank in an oil rotary vacuum pump of the present invention.

FIG. 2 is a vertical cross-sectional front view of an example of an oil tank in a conventional oil rotary vacuum pump.

[Explanation of symbols]

1 oil tank 2 Oil in the oil reservoir 3 Lower oil drain 4 Oil level gauge 5 Oil filter 6 Exhaust inlet 7 Lower guide wall 8 Upper guide wall 9 Exhaust stack 10 exhaust port 11 Upper oil drain port

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) F04C 29/02 351 F04C 29/02 351D 361 361Z (72) Inventor Kazuo Saito 2-23-12 Nakagawa, Adachi-ku, Tokyo F term (reference) 3H029 AA01 AA17 AA21 AB07 BB36 BB41 CC26 CC43

Claims (3)

[Claims] 1. An oil rotary vacuum pump is provided with an oil sump portion, an oil filter communicating with the sump portion, and an oil discharge port at a lower portion of an oil tank, and exhaust gas from the oil rotary pump is introduced into the tank during exhaustion. In an oil rotary vacuum pump equipped with an oil tank for liquefying the oil mist and discharging it while flowing down to the sump, an inert oil having a large specific gravity is used as the oil, and the oil filter is used for the oil sump of the oil sump. An oil rotary vacuum pump characterized by being installed above or almost at the same level as the surface. 2. The oil rotary vacuum pump according to claim 1, wherein an upper oil discharge port is newly provided in substantially the same position as the oil level gauge in the oil sump. 3. The oil rotary vacuum pump according to claim 1, which is used as a vacuum generator of a laminating apparatus in a solar cell module manufacturing process.