JP2007218164A - High speed rotation apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high speed rotation apparatus such as a turbo blower provided with an internal lubricating device of low oil consumption not having limitation in use conditions without causing increase of weight and size, and complication of a structure. <P>SOLUTION: This apparatus is provided with a motor chamber 18 including a motor mechanism rotating the rotary shaft, the internal lubricating mechanism pumping up lubricating fluid for lubricating a bearing 16 of the rotary shaft from an oil sump 17 by a pump mechanism provided on the rotary shaft 11 and collecting the same to the oil sump 17 through the motor chamber 18 after supplying the same at least to the bearing 16, and an introducing means introducing gas of the motor chamber 18 into lubricating fluid in the oil sump 17 together with an exhaust mechanism exhausting gas of the motor chamber 18. The gas is exhausted with passing through the inside of the lubricating oil. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a high-speed rotating device such as a turbo blower provided with an internal lubricating device using oil or the like as a lubricating liquid.

  Oil mist generated during operation of the turbo blower rides on the flow of vacuum exhaust and is discharged to the outside of the main body simultaneously with the vacuum exhaust.

Conventionally, oil mist is collected and collected by using an external oil mist separator 101 as shown in FIG. 7 or using a porous filter 102 inside the blower as shown in FIG.
JP2004-183620A

  With the use of the external oil mist separator 101 of FIG. 7 and the use of the porous filter inside the blower of FIG. 8, there is a limit of the collection capacity, rough drawing at the start / stop of the blower, and oil drawing due to air release, Oil consumption increases depending on the operation time and the number of start-ups. Therefore, it is necessary to monitor and manage the oil amount regularly.

  Furthermore, in the case of the external oil mist separator shown in FIG. 7, it is impossible to avoid an increase in weight / size and a complicated structure. In addition, regarding the use of the porous filter inside the blower in FIG. 8, the range of conditions of the vacuum exhaust amount effective for mist collection is limited due to the restrictions on the coarseness of the filter and the pressure loss, and it can be used under a wide range of operating conditions. It becomes difficult to suppress oil mist discharge.

  The present invention solves the above-mentioned problems, and provides a high-speed rotating device such as a turbo blower equipped with an internal lubrication device that does not increase in weight, size, and complexity of the structure, and has no restrictions on use conditions, low oil consumption, and an internal lubricating device. The purpose is to provide.

  In order to solve the above problems, the present invention provides a motor chamber having a motor mechanism for rotating a rotating shaft and a lubricating liquid for lubricating a bearing of the rotating shaft from a tank chamber by a pump mechanism provided on the rotating shaft. In a high-speed rotating device having an internal lubrication mechanism that is sucked up and supplied to at least a bearing and then collected in the tank chamber through the motor chamber, and an exhaust mechanism that exhausts the gas in the motor chamber, Introducing means for introducing gas into the lubricating liquid is provided, and the gas passes through the lubricating liquid and is exhausted by the exhaust mechanism.

The following configurations are also included in the present invention.
(1) The introduction means is constituted by a tubular member immersed in a lubricating liquid.
(2) A shielding plate is immersed in the lubricating liquid so that the gas guided into the lubricating liquid moves in the exhaust direction while being exposed to the lubricating liquid.
(3) In order to prevent the lubricating liquid sucked up from the tank from being discharged to the outside, a lubricating liquid trap chamber is provided in the middle of the exhaust path from the tank to the outside. Further, the trapping chamber is provided with a return hole for the lubricating liquid to the tank, and the return hole is provided with a filter for preventing the lubricating liquid from being sucked from the tank.

  In the present invention, the oil mist generated during the turbo blower operation can be efficiently recovered into the oil sump without increasing the weight / size of the apparatus and complicating the structure and without restricting the use conditions.

  A high-speed rotating device of this embodiment will be described with reference to FIG. In the high-speed rotating device of this embodiment, for example, carbon dioxide gas used in a gas laser is provided in the middle of the gas circulation path 10 and circulated by an impeller 11 that rotates at high speed.

  The impeller 12 is fixed to the rotating shaft 11, and a rotor member 14 and a stator member 15 constituting a motor are fixed to the rotating shaft 11 and the housing 13, respectively.

  The rotary shaft 11 is pivotally supported by the bearing 16 and is provided with a pump mechanism in which a hollow hole is formed and the lubricating liquid of the oil sump 17 in which the rotary shaft 11 is immersed is sucked and guided to the bearing 16.

  Further, the motor chamber 18 is evacuated to prevent the oil mist of the lubricating liquid in the motor chamber 18 from entering the gas circulation path 10 through the gap of the seal portion 19 separating the gas circulation path 10 and the motor chamber 18. A vacuum pump 20 for exhausting is connected.

  Further, the exhaust path of the motor chamber 18 by the vacuum pump 20 always passes through the lubricating liquid of the oil sump 17 so that the gas in the motor chamber 18 containing oil mist passes through the oil sump 17 and is then exhausted by the vacuum pump 20. The nozzle 21 is immersed in the oil so that the gas bubble b introduced to the oil sump 17 is exposed to the lubricating liquid as much as possible, and the bubble b is placed in the oil at a deep position of the oil sump 17. It is configured to open. Thereby, since the time for which the bubble b is in contact with the lubricating liquid can be lengthened, the collection and recovery efficiency of the oil mist is improved.

  As shown in FIG. 2a, the nozzle 21 itself is extended to guide the gas bubble b into the oil, and as shown in FIG. 2b, the partition member 22 between the motor chamber 18 and the oil sump 17 is oiled. The gas bubble b may be guided into the oil from the hole 23 of the partition member 22 by extending toward the bottom surface of the sump 17.

  Further, as shown in FIGS. 1 and 3, a shielding plate 24 is provided along the oil surface in the oil sump 17 so that the bubbles opened in the oil sump 17 are not immediately opened on the oil surface. However, since the time during which the bubble b is in contact with the lubricating liquid can be lengthened, the oil mist collection and recovery efficiency is improved.

  Further, as shown in FIG. 4, by using a permeable material (porous material) for the shielding plate 25, the bubble b is exposed to the oil for a long time, and the bubble b is applied to the shielding plate 25. By penetrating, the bubbles b are subdivided and the surface area in contact with the oil is increased, so that the oil mist can be effectively adsorbed and removed. Thereby, by suppressing the undulation of the oil surface and subdividing the bubbles b, it is possible to suppress the splash of the oil mist in the same manner. And since it is a porous material, the oil penetrates, so even if the thickness is increased, the volume occupied in the oil sump 17 can be suppressed, and the amount of oil in the oil sump 17 is not greatly affected. Therefore, the fragmentation of bubbles can be promoted.

  Further, as shown in FIG. 1, an oil trap chamber 26 is provided in the middle of an exhaust path from the oil sump 17 to the vacuum pump 20 through a hole 30 provided with a blow-off prevention filter. By forming a reflux path to the oil sump 17 through the oil return hole 27, the oil contained in the exhaust from the oil sump 17 can be collected, which is effective in that the oil can be reused.

In addition, it is effective to incorporate the following mechanism in the space in order to more effectively suppress the roughing when the blower is started / stopped and the discharge due to the oil that is generated when the air is released.

For example, as shown in FIG. 5, a filter 28 (plate shape, cylindrical shape, etc.) is mounted in the chamber 26, and rough evacuation, oil mist blown out from the oil sump 17 when released into the atmosphere is collected, or As shown in FIG. 6, it is effective to provide a partition wall alternately in the space (chamber) to form the labyrinth structure 29, and to intercept and collect the oil mist blown out from the oil sump 17 during roughing and release to the atmosphere. It is.

The schematic of the high-speed rotation apparatus which concerns on the Example of this invention is shown. The structure of the nozzle in the high-speed rotation apparatus of FIG. 1 is shown. The structure of what used the shielding board in the modification of the high-speed rotation apparatus of FIG. 1 is shown. The structure of what used the shielding board of the transparent material in the modification of the high-speed rotation apparatus of FIG. 1 is shown. 1 shows a modification of the high-speed rotating device in FIG. 1 in which a filter is attached to an oil trap chamber. FIG. 3 shows a modification of the high-speed rotating device of FIG. 1 in which a labyrinth structure is adopted for the oil trap chamber. The structure of the conventional high-speed rotation apparatus (1) is shown. The structure of the conventional high-speed rotation apparatus (2) is shown.

Explanation of symbols

11 Rotating shaft 16 Bearing 17 Oil sump 18 Motor chamber

Claims (5)

After a motor chamber having a motor mechanism for rotating the rotating shaft and a lubricating liquid for lubricating the bearing of the rotating shaft are sucked up from the tank chamber by a pump mechanism provided on the rotating shaft and at least supplied to the bearing, In high-speed rotating equipment having an internal lubrication mechanism that passes through the motor chamber and is collected in the tank chamber, and an exhaust mechanism that exhausts the gas in the motor chamber, an introduction unit that guides the gas in the motor chamber to the inside of the lubricating liquid is provided. The high-speed rotating device is configured such that the gas passes through the inside of the lubricating liquid and is exhausted by the exhaust mechanism. The high-speed rotating device according to claim 1, wherein the introducing means is a tubular member immersed in a lubricating liquid. 3. A high-speed rotating device according to claim 1, wherein a shielding plate is immersed in the lubricating liquid so that the gas guided into the lubricating liquid moves in the exhaust direction while being exposed to the lubricating liquid. . 4. A lubricant trap chamber is provided in the course of an exhaust path from the tank to the outside in order to prevent the lubricant sucked up from the tank from being discharged to the outside. High-speed rotating equipment described in 1. The trap chamber is provided with a return hole for the lubricating liquid to the tank, and the return hole is provided with a filter for preventing the lubricating liquid from being sucked from the tank. High-speed rotating equipment.

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