JPH01313691A - Vacuum pump - Google Patents

Abstract

PURPOSE:To supply a splash of oil to a bearing, even when a pump is in high speed rotation, by providing an oil splashing guide of plate shape so as to cover a side in which a speed in the periphery of a slinger has a component in the upper direction when the pump is in operation. CONSTITUTION:Screw rotors 1, 2 are rotatably supported by bearings 5, 6. By splashing oil in an oil reservoir 13, provided in a housing 12, by a disk- shaped slinger 11, splashing oil is supplied to the bearing 6 in a suction side. By rotating the slinger 11, a flow of oil or its scattering is guided by a cone- shaped splashing guide 12a of the housing 12, being changed in a direction having component in the upper direction further in the direction of rotor axial direction bearing side, and the oil is injected dropping to the bearing 6. In this way, a supply amount of bearing oil can be ensured even in the time of high speed rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to the oil supply and installation of RI horizontal 1D vacuum pumps, and particularly to a splash type oil supply device suitable for pumps whose rotors rotate at high speed.

[Conventional technology]

As described in Japanese Patent Application No. 61-175388, the conventional device does not have a guide that covers the side of the outer periphery of the slinger that has an upward component (the side that splashes oil). (At least not within the radius of the slinger where the guide effect is likely to occur.) Therefore, the only oil that was splashed onto the bearing was droplets directly splashed by the slinger.

[Problem to be solved by the invention]

Normally, the shape of the slinger is disc-shaped, and although it depends on the properties of the oil, the amount of oil splashed by the slinger decreases as the speed increases, and at speeds of several thousand RPM or more, the amount of oil splashed by the slinger decreases at speeds of about 10,000 RPM or more. Then it will hardly bounce up. In this case, in conventional devices, oil is not supplied to the bearing, resulting in poor lubrication. In order to improve this, it is possible to make the slinger shaped like an impeller, but this increases the cost. The purpose of the present invention is to
The purpose of the slinger is to supply oil droplets to the bearing in a relatively easy way, without making it straight, even during high-speed rotation.

[Means to solve the problem]

This object is achieved by providing a guide that covers the outer circumference of the slinger on the splash side.

[Effect]

Even when a simple disk-shaped slinger rotates at high speed, a nearly horizontal flow or splash of oil occurs for f minutes, so this direction is changed by the guide, and a part of the flow or splash is transferred to the bearing. , and indirect splash refueling takes place.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 8. FIG. 1 is a cross-sectional view of the main body of the dry screw vacuum pump, and FIG. 2 is a vertical cross-sectional view. Figure 3 is the second
It is an A-Alil'i plane view of the figure.

Reference numeral 1 denotes a male screw rotor, and 2Vi female screw rotor 4 is supported by bearings 5 and 6 on casings 3 and 4, and is engaged with each other by timing gears 7 and 8 to rotate synchronously. The gear 8 also serves as a pinion and meshes with a pull gear (not shown), which is driven by a [71 device (not shown)]. The rotor ri rotates in the direction of the red stamp in Figure 3, 9 is the suction port, l
O is the discharge port. The discharge side bearing 5ri is forcibly lubricated by a lubricating device (not shown). Reference numeral 11 denotes a disk-shaped slinger attached to the female rotor 2, which splashes oil from the oil eIl 18 provided in the housing 12, thereby spraying the suction side bearing 6 with oil. ■4 and 15 are shaft seal devices that prevent bearing lubricating oil from entering the rotor N (working chamber).

The part of the inner surface of the housing 12 that covers the outer circumference of the slinger 11 has a conical shape with the central axis parallel to the rotor axis and the apex on the opposite side of the bearing 6, and the distance from the outer circumference of the slinger to the outer circumference of the slinger is It is less than half the radius. The downward and substantially horizontal flow or scattering of oil that always occurs due to the rotation of the slinger is guided by the conical inner surface 12a of the housing 1z, and is directed upward and toward the bearing side in the axial direction of the rotor. It is strained in the same direction and poured onto the bearing. The inner surface 12a serves as an oil splash guide. The amount of oil splashed directly upward by the slinger towards the bearing side varies greatly depending on the properties of the oil and the rotation speed.

According to this embodiment, the slinger that is constantly generated can supply the oil that is splashed in a substantially horizontal direction to the bearing. Even if the amount of oil applied directly to the bearing by the slinger decreases, the bearing will not have insufficient sliding.

〔Effect of the invention〕

According to the invention, the direction of the almost horizontal oil flow or splash generated by the slinger is changed by the guide, and the oil can be splashed up indirectly even when the oil is not splashed up by the slinger itself. .

Depending on this rounding and conditions, a certain amount of bearing oil supply can be secured even if a simple shaped slinger without the ability to flip up is used.

[Brief explanation of the drawing]

FIG. 1 is a plane view of a main body of a dry screw vacuum pump according to an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view, and FIG. 8 is a cross-sectional view taken along line AA in FIG. ■...Male rotor 2...Female rotor 8...
・Main casing 4...Suction side casing
5...Discharge side bearing 6...Suction side bearing 7...
・Female timing gear 8...Male timing gear 9...Suction port 10...Discharge port 11...
・Slinger 12...Housing 13...Oil sump
12a...Flip-up guide-0 1st (2)

Claims (1)

[Claims] 1. The shaft is supported in the casing in a substantially horizontal direction, and consists of two rotors that rotate synchronously, and is attached to the rotor shaft and an oil sump provided near the bearing of the rotor shaft. In a vacuum pump that uses an oil splasher to lubricate the bearing of the rotor shaft, a plate-shaped oil is used to cover at least the side of the slinger where the speed of the outer periphery has an upward component during pump operation. A vacuum pump characterized by having a flip-up guide. 2. The vacuum pump according to claim 1, wherein the plate-shaped oil splashing guide has a curved surface that moves away from the shaft center as it approaches the bearing side in the axial direction of the rotor. 3. The shaft is supported in a substantially horizontal direction within the casing, and consists of two rotors that rotate synchronously. Oil is removed by an oil reservoir provided near the bearing of the rotor shaft and a slinger attached to the rotor shaft. This method replenishes the bearing of the rotor shaft by applying oil to the bearing of the rotor shaft.
In a vacuum pump in which the rotor rotates in an upward direction (on the side between the rotors), the casing housing the slinger covers at least the side where the speed of the slinger's outer periphery has an upward component during pump operation, and the slinger's outer periphery. A vacuum pump characterized in that the gap between the sulin and the sulin has an inner surface that is smaller than the maximum radius of the sulin. 4. The vacuum pump according to claim 3, wherein the inner surface of the casing covering the slinger has a curved surface that moves away from the shaft center as it approaches the bearing side in the axial direction of the rotor.