JPS58160589A - Grease seal vertical roots gas compressor - Google Patents

Abstract

PURPOSE:To improve seal efficiency through a grease seal, by using the upper line of a dam to gradually control a flow of grease supplied to a grease reservoir in the bottom of a grease separator chamber. CONSTITUTION:Grease G accumulated to a grease reservoir 14 softens its surface part by a temperature rise of a casing 2 due to rotation of Roots rotors 10, 10' and temperature of compressed gas sucked from a suction port 3 and discharged via a grease separator chamber 5 from a delivery opening 4 to a delivery port 8, and the grease flows little by little into the casing 2 from the upper edge of a dam 12 and outflow ports 13. Accordingly, seal efficiency by a grease seal is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses grease that has a larger molecular weight than conventional oil sealing oil and is far superior in automatic separation from gas, and uses a grease to vertically connect a pair of Roots rotors rotating in the meshing direction. The grease-sealed gas compressor is adapted to the mechanism of a vertical Roots-type gas compressor arranged in the direction, and a pair of Roots rotors are arranged in the vertical direction under =L inside a cocoon-shaped casing. A grease separation chamber with a discharge port at the top is provided in communication with the discharge opening on the side of the casing, and a dam is erected between the bottom of the discharge opening and the grease separation chamber, which communicates the separation chamber with the inside of the casing. death,
The dam is characterized in that a grease outlet communicating between the bottom of the grease separation chamber and the inside of the casing is provided, and a grease reservoir for a grease elbow is provided in the bottom of the grease separation chamber.

Among Roots-type gas compressors used for compressing and pumping gas or for vacuum suction, it is well known that oil-sealed type gas compressors use fluid oil to seal the gap between the Roots rotor and the inner surface of the casing. It is well known that a vast volume of oil separation chamber or oil separation device is required to separate the sealing oil mixed into the gas, and the screw compressor has been praised for its small size and high performance. Since it is also an oil-sealed type, the oil separation device is large-sized, and if the separation device is included, there is no possibility of miniaturization.

The present invention aims to eliminate the above-mentioned defects of oil-sealed gas compressors due to sealing oil, and is adapted to the vertical Roots-type mechanism as described above.

Grease used for the purpose of grease sealing has a large molecular weight,
The viscosity is also high, but it tends to soften significantly depending on the operating temperature of the compressor, so depending on the performance of the compressor, the viscosity can be increased to 9/C71+, 3 to 9~jkg/c-
It is necessary to select the grease according to the compression capacity, such as up to 3 JC9 to 7 ky/crl+, for example /k
For Roots type compressors up to g/cJ, lithium-based full vanier A J , A J , heat resistance / 30'C
Grease of up to 3 to 9/c- to 7 kg is sufficient.
/cl and as the compression pressure increases, choose a silicone-based grease with a heat resistance of /10'C to 300°C. However, in any case, separation of grease particles on the discharge side is easy, and the separation chamber is especially It does not need to be large-sized or require separation aids such as oil elements, wire mesh, felt, etc., and can be downsized by configuring the grease separation chamber as part of the casing.

An embodiment of the invention will be described with reference to the accompanying drawings.

In the figure, reference numeral 2 denotes a vertical cocoon-shaped casing with integrally formed installation legs 1, and a suction port 3 is formed on one side of the casing 1, and a discharge opening q is provided on the other side.

In addition, an inclined bottom 6 inclined toward the opening is provided on the outside of the discharge log.
A vertical grease separation chamber S is provided so as to hang over the upper surface of the outer surface of the casing, and a discharge port t and a grease supply port 9 with a stopper are provided in the ceiling 7 thereof.

Inside the outside of the casing is a leaf-shaped roots rotor 10.1.
0' are arranged in the vertical direction to form a vertical shape, and their axis 1/S
11' protrudes outside the casing. There is a gap between the pair of Roots rotors 10S/Q' and the upper and lower curved surfaces outside the casing. A gap S of approximately /11111 is generated.

Those rotors 10S and 10' rotate in an arrow direction Make it in the meshing direction of the lines.

Δ The bottom ga of the discharge opening q is connected to the lower end of the inclined bottom B of the grease separation chamber S, and a dam /- is provided upwardly from the bottom &a. The height of the dam 12 is based on the axis/
The distance between the axes of lSl/' should be about the same as the center or slightly lower than that, and a through hole should be cut into it up to the bottom ψa and penetrated into the dam lλ using several thin longitudinal grooves of grease. It can also be eggplant.

A grease reservoir is provided on the inclined bottom 6 (this inclined bottom 6 may be horizontal) of the separation chamber S, into which grease G is supplied from a grease supply port 9 using a grease pump or the like. Due to the viscosity of the grease G, it swells up to the upper end of the dam as shown in the diagram to prevent the avalanche-like flow into and out of the casing.

To explain the operation of this embodiment, the grease G accumulated in the grease reservoir/4A configured above the sloped bottom of the grease separation chamber S is caused by the temperature rise of the casing co due to the rotation of the roots rotors io and io' and the suction. The surface part is softened by the temperature of the compressed gas that is sucked in from the port 3 and discharged from the discharge opening q through the grease separation chamber S to the discharge port t, and a small amount of gas is injected into the casing from the upper edge of the dam/J and the diversion lono 3. The excess adhesion is returned to the left side of the figure by the meshing portion a of both rotors 1oSio', and is adhered to the circumferential surfaces of both the upper and lower rotors 10, 10' in the form of a thin film. The adhered grease is also transferred to the inner surface of the casing 2 and closes the gap S, so that the pressure gas in the high pressure part on the discharge rod side is transferred to the suction port 3 due to the unique viscosity of the grease.
There is no backflow to the low pressure area on the side. Also, some of the grease G is dispersed in the compressed gas and moves from above the dam/2 of the discharge opening q into the grease separation chamber S, but since the grease is a polymer, there are differences in specific gravity within the chamber S. The grease is easily separated and reduced to the grease filling soil in the grease reservoir lψ, and due to the circulation of the grease, the grease lump assumes an agitated shape.

According to experiments, the amount of consumption in the 1 kg/c-pressure compressor shown in Figs. 1 to 3 was almost zero even after three months of continuous operation.

As is clear from the description of the embodiments described above, the present invention is a roots-type gas compressor used for pressurized gas delivery or vacuum suction, in which a vertical roots rotor set is arranged in the vertical direction, and grease separation is performed. A discharge opening provided in the chamber, a casing, and an upper edge of a dam that protrudes upward from the bottom of the opening to prevent a large amount of grease from flowing out and to control the gradual flow of grease that is supplied to the grease reservoir at the bottom of the grease separation chamber. , the arrangement of the grease outlet etc. is rationally matched to the configuration of the vertical Roots rotor casing, and the sealing efficiency is better than that of conventional oil seals. The separation of grease particles carried by the compressed gas that moves to the grease separation chamber with a slight loss of speed is extremely good.For this reason, a miniaturized grease separation chamber is provided outside the casing, and the entire gas compressor is separated. Can be manufactured in small volume. Further, even if the grease separation chamber is small, it has various effects such as eliminating the need for separation auxiliary materials such as felt and wire mesh, which are likely to be clogged by grease that is made of high molecular weight, viscous, and condensable at room temperature.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of the present invention, in which FIG. 7 is a longitudinal sectional side view of the center, FIG. 2 is a longitudinal sectional side view taken along the line A-A in FIG. FIG. Co → casing, q → discharge opening, qa bottom, S△ → grease separation chamber, l゛ → discharge port, l- → dam, 13 → grease outlet, 14I → grease reservoir, G → grease applicant Anlet Co., Ltd.

Claims (1)

[Claims] A pair of upper and lower Roots rotors are arranged vertically inside a cocoon-shaped casing, and communicated with a discharge opening on the side of the casing to provide a grease separation chamber having a discharge opening at the top, and the separation chamber and the casing. A dam is erected between the bottom of the discharge opening communicating with the inside and the grease separation chamber,
A vertical Roots type grease sealed gas compression device characterized in that the dam is provided with a grease outlet that communicates the bottom of the grease separation chamber with the inside of the casing, and a grease reservoir for a grease elbow is provided in the bottom of the grease separation chamber. Machine.