JP4844038B2 - Turbo rotating equipment - Google Patents

Description

  The present invention relates to a turbo rotating device applicable to, for example, a blower as an electric compressor for gas circulation in a gas laser oscillator device.

  For example, in the case of a flow type carbon dioxide gas laser oscillator device, it is compressed while flowing a mixed gas of carbon dioxide gas and other gas and supplied to the laser oscillator to resonate, and a gas circulation circuit is configured in the device. Yes. As a blower as one element in the configuration of the circulation circuit, a turbo rotating device that rotates a turbo blade at high speed to compress gas and supplies the gas to a laser oscillator is used.

In this type of turbo rotating device, a turbo blade is rotatably disposed above a housing,
A mechanism for compressing and discharging the gas is provided, and a motor for rotating the turbo blade at a high speed is disposed below. The rotating body including the rotor of the motor, the turbo blade, the rotating shaft, and the like is pivotally supported by a mechanical bearing and is provided with lubricating means using oil. Therefore, although oil mist is generated, a method of exhausting with a vacuum pump is employed so that the oil mist is not discharged together with gas compression (see Patent Document 1).

  The configuration of this turbo rotating device is as shown in FIG. FIG. 6 is a schematic longitudinal sectional view showing a turbo blade 7 rotatably disposed inside the housing 1 and a motor 2 for driving the turbo blade 7 at high speed. Both are connected by a rotating shaft 4. The motor 2 is composed of an electrode coil 2 K fixed to the housing 1 side and a rotor 2 M fixed to the rotary shaft 4 corresponding to the electrode coil 2 K, and an inverter is connected to the electrode coil 2 K. Electric energy is supplied from 3.

The rotary shaft 4 is rotatably held with respect to the housing 1 via an upper bearing 5 and a lower bearing 6. A turbo blade 7 is fixed to a mounting shaft 4 S formed above the rotary shaft 4. ing. A rotating body including the motor 2, the rotor 2 M, and the rotating shaft 4 is held by an upper bearing 5 and a lower bearing 6 that constitute a bearing mechanism. The upper bearing 5 and the lower bearing 6 are disposed in the motor chamber M 1.
When the turbo blade 7 is driven to rotate at a high speed by the motor 2, the gas is sucked from the intake port 1 K, compressed and discharged from the exhaust port 1 H. The intake port 1 K to the exhaust port 1 H form a gas compression chamber C 1. The gas from the exhaust port 1 H is supplied to the laser oscillator (not shown) through the gas circulation circuit (not shown) as described above.

  Incidentally, as shown in FIG. 6, the rotary shaft 4 has a hollow hole 4H formed on the shaft center. The lower part of the hollow hole 4H has a tapered shape with the inner hole expanding upward, The part is immersed in the lubricating oil L 2. Accordingly, the lubricating oil L that has entered the lower region of the hollow hole 4 H moves upward in the hollow hole 4 H under the action of the centrifugal force due to the rotation of the rotary shaft 4, The hollow hole 4 H causes a pump function. Thus, the lubricating oil L is sequentially sent upward and discharged outward from the injection hole 4 T to cool the motor 2 and lubricate the upper bearing 5 and the lower bearing 6. The lubricating oil L that has been lubricated and cooled is again stored in the lower oil tank 1 Y, sucked up again, and circulated.

  In this way, the lubricating oil L circulates to lubricate the upper bearing 5 and the lower bearing 6. By this lubrication, in particular, the sprayed oil L (oil mist) exists and floats in the motor chamber M 1. It will be. The presence of the atomized oil L 1 in the motor chamber M 1 makes lubrication in the upper bearing 5 and the lower bearing 6 and the like good, but when this oil mist flows into the gas compression chamber C 1, it flows into a laser oscillator and the like, and laser oscillation Reduce functionality.

  Therefore, the gas compression chamber C and the motor chamber M are blocked by the seal portion S 2 in the partition wall portion made of a member integral with the housing 1 or the housing 1. That is, the housing 1 is provided with a penetrating portion in a range in which the rotating shaft 4 can pass in a non-contact manner above the upper bearing 5, and a seal portion S is formed in cooperation with the rotating shaft 4. For example, a labyrinth seal shown in the drawing is applied to the seal portion S. The gap between the rotating shaft 4 and the penetrating portion of the seal portion S 1 by this labyrinth seal is normally set to several tens of microns. In addition to the labyrinth seal, a gas seal set to a minute parallel gap of several 10 microns is also employed. On the other hand, the motor chamber M is evacuated to vacuum by an external vacuum pump (not shown) via an exhaust pipe R 1. This is to prevent the motor chamber M 1 from being filled with the mist of the lubricating oil L 1 and leaking into the gas compression chamber C 2 through the small gap of the seal portion S 1 as described above.

  As described above, in the turbo type rotating device used for the laser oscillator, the presence of the oil L mist and the countermeasure are important, but the presence of the oil L 2 which is the source of the mist cannot be ignored. In particular, it is necessary to prevent the oil L discharged from the injection hole 4 T of the rotating shaft 4 from reaching the upper seal portion S as much as possible. Therefore, as shown in FIG. 6, the system for holding the upper bearing 5 and the seal portion 8 constituting the seal portion S are placed on the upper surface of the bearing holding member 9. 8 A is a through hole drilled for the rotating shaft 4 penetrating the seal portion 8, and 9 H is a through hole drilled in the central portion of the bearing holding member 9.

Further, the seal portion 8 and the bearing holding member 9 are fixed to the housing 1 via bolts 9 B shown in FIG. In addition, the following measures are taken in terms of strength. First, a high strength steel material or the like is adopted for the rotating body side, that is, the rotating shaft 4 constituting the seal portion S. On the other stationary side, that is, the sealing portion 8, rotational energy is shockedly propagated to the stationary side by contact during high-speed rotation. In order to prevent secondary disasters, soft lead materials or aluminum materials are used. In order to observe the deterioration of the upper bearing 5 and the lower bearing 6, a vibration meter (monitor) that measures the vibration of the equipment is installed. Or, a regular overhaul is performed to prevent failures in advance.
Japanese Laid-Open Patent Publication No. 2 0 00-2 0 9 8 15 (Page 1-3, FIG. 1-8)

  In the turbo rotating device having such a configuration, the deterioration of the bearing or the like progresses due to long-term use or repeated use at high speed. In particular, the head has a large-mass turbo blade 7 and the load on the upper bearing 5 and the lower bearing 6 which are the support shafts of the rotating shaft 4 is increased, so that the deterioration of the bearing easily proceeds. As this deterioration progresses, the shaft center of the rotating shaft 4 starts to shake, and when the turning of the rotating shaft 4 becomes excessive due to the progress of the deterioration, the seal portion 8 is struck by collision or sliding. With the progress of this cutting, the gap of the seal portion S gradually increases, and the above-described sealing function is destroyed, and each part of the rotating device is damaged and crushed, which is dangerous. There is a concern that the differential pressure between the motor chamber M and the gas compression chamber C 1 decreases due to the destruction of the seal portion S 1, and the oil L 2 flows backward. When the upper bearing 5 fails, the rotating shaft 4 develops a rubbing motion centering on the lower bearing 6 to continuously destroy the lower bearing 6, and the rotating shaft 4 loses the support and loses other members in the rotating equipment. For example, the turbo blade 7 may collide with the housing 1 and may cause excessive failure.

In order to solve the above-described problem, a turbo rotating device provided by the present invention includes an annular body having an inner peripheral surface that is adjacent to and surrounds an outer peripheral surface of a rotary shaft that rotationally drives a turbo blade. It is installed in a fixed part surrounding the rotating shaft in the rotating device. Therefore, when an abnormality occurs in the support of the rotating shaft due to deterioration or destruction of the bearing and the rotating shaft fluctuates or tilts, the annular body receives this, and the annular body is damaged and deformed to absorb the rotational energy of the rotating shaft. .
The turbo type rotating device provided by the present invention secondly has an annular body installed in the vicinity of the bearing. Therefore, the destruction of rotating equipment is minimized.

Furthermore, a third aspect of the present invention provides a turbo rotating device in which an annular body is made of a material softer than the material of the rotating shaft. Therefore, when the rotating shaft fluctuates or tilts, the rotating shaft contacts the annular body and absorbs rotational energy steadily.
Furthermore, a fourth aspect of the present invention provides a turbo type rotating device having a penetrating portion through which a rotating shaft penetrates a partition wall partitioning a gas compression chamber side by rotation of a turbo blade and a motor chamber on a side for rotationally driving the turbo blade. An annular body having an inner peripheral surface that is adjacent to and surrounds the outer peripheral surface of the rotating shaft is provided. Therefore, when the rotation shaft fluctuates or tilts, the rotation shaft contacts and fuses with the annular body.
Furthermore, a fifth aspect of the present invention provides a turbo-type rotating device in which the center axis of the annular body provided in the third aspect is deviated from the center of the rotating shaft. Therefore, when the rotating shaft collides with the annular body, the rotating shaft is restrained.
Furthermore, the sixth aspect of the present invention provides a turbo rotating device in which the material of the annular member provided in the fourth aspect is softer than the material of the rotating shaft. Therefore, when the rotating shaft collides, the restraint and fusion are ensured.

  When the runout of the axis of the rotating shaft increases due to deterioration of the bearing, etc., or when the rotating shaft fluctuates or tilts when the bearing breaks, the annular body receives this and absorbs the rotational energy of the rotating shaft. Alternatively, the annular body itself is deformed or damaged to absorb the rotational energy of the rotating shaft. In addition, since the annular body is installed in a fixed portion that surrounds the rotating shaft in the rotating device, impact absorption is effectively performed by the entire rotating device. Accordingly, it is possible to prevent excessive failure of the rotating device. In particular, the partition wall can be prevented from being broken by installing an annular body on the partition wall.

A feature of the present invention resides in that an annular body having an inner peripheral surface adjacent to and surrounded by an outer peripheral surface of rotation for rotationally driving the turbo blade is provided in a fixed portion of the rotating device. The annular body is preferably installed in the vicinity of the bearing portion of the rotating shaft as much as possible. Those satisfying these conditions are the best mode.
[Reference Example 1]

This reference example is shown in FIG. FIG. 1 is a view showing a longitudinal section of a turbo type rotary device similar to FIG. 6, and an annular body 1 on a fixed portion 1 F of the rotary device in the vicinity of the lower bearing 6 with respect to a rotary shaft 4 for rotating the turbo blade 7. 0 is installed. The fixed portion 1 F is a fixed portion that surrounds the rotating shaft 4 in the rotating device and extends to a position close to the rotating shaft 4.
That is, as shown in FIG. 1, the rotating shaft 4 for rotationally driving the turbo blade 7 is supported by the upper bearing 5 and the lower bearing 6, but the section M is fixed to the fixed portion 1 F that holds the lower bearing 6. A letter-shaped annular body 1 0 is installed in a shape in which the rotary shaft 4 is inserted. The annular body 1 0 is made of, for example, a copper-based material. The cross-sectional shape is M-shaped, and a hole 1 0 H through which the rotary shaft 4 passes is formed in the center. The base has an open cylindrical shape, and is fixed to the fixing portion 1 F which is a part of the housing 1 by a crown. The hole 1 0 H has a minimum diameter through which the rotary shaft 4 can pass, that is, an inner hole having an inner peripheral surface that is close to and surrounds the outer peripheral surface of the rotary shaft 4 is formed in the annular body 1 0. And the annular body 1 0 have a clearance fit relationship.
As described above, the upper portion of the annular body 1 0 is formed into a squirrel-shaped shape, and the inner end of the slick is in close proximity to the outer periphery of the rotating shaft 4. In FIG. 1, parts indicated by the same reference numerals as those shown in FIG. 6 are the same as the parts shown in FIG.
Therefore, in the above configuration, when the lower bearing 6 deteriorates due to long-term use and deforms or breaks, the rotating shaft 4 swings while rotating and fluctuates or tilts. Then, it immediately collides with or comes into contact with the inner peripheral surface of the annular body 1 0. Then, since the annular body 1 0 is soft with respect to the rotating shaft 4, the annular body 1 0 is melted while being in sliding contact, and the rotational energy is absorbed by the annular body 1 0. In the case of the illustrated example, since the upper portion of the annular body 1 0 is formed in a heavy shape, it has a function of biting downward and braking the rotation of the rotating shaft 4 when it is broken. Therefore, excessive destruction of the rotating device is prevented. It is also possible to insert the annular body 1 0 so as to have a larger diameter and to contact the inner hole of the housing 1.
[Reference Example 2]

This reference example is shown in FIG. 2 also shows a longitudinal sectional view of the turbo rotating device, as in FIG. 1. Parts indicated by the same reference numerals as those shown in FIG. 6 are the same as those shown in FIG. Omitted. In the second reference example shown in FIG. 2, the bearing holding member 9 that holds the upper bearing 5 is installed in the fixing portion 1 C that surrounds the rotating shaft 4 by the fixing portion of the rotating device. An example in which an annular body 1 1 is installed in C 1 is shown. The annular body 1 1 has a dish shape and is mounted on the shelf portion of the housing 1, and the inner peripheral surface of the inner hole 1 1 H surrounds the outer peripheral surface of the rotating shaft 4 so as to provide a clearance fit. There is a relationship. The material of the annular body 1 1 is also softer than the material of the rotating shaft 4.
According to this reference example, when the upper bearing 5 is deformed or damaged due to deterioration, the rotating shaft 4 fluctuates and tilts to contact the annular body 1 1, and further to slide. By this contact, sliding contact, etc., the energy of the rotating shaft 4 is fused and absorbed by the annular body 1 1. Excessive destruction of rotating equipment is prevented.

The first and second reference examples have been described above in detail, but they are common in that the annular bodies 1 0, 1 1 are installed in the vicinity of both bearings 5, 6. As a reference example in which this feature is further developed, an example in which the annular bodies 1 0, 1 1 are provided in the upper and lower bearings 5, 6 can be given. In this case, the absorption of the rotational energy of the rotating shaft 4 is shared by about half, and the disaster can be suppressed in a smaller state.
[Example 1]

This embodiment is shown in FIG. FIG. 3 is a view showing a longitudinal section of a turbo rotating device, similar to FIGS. 1 and 2. In the present embodiment shown in FIG. 3, the annular body 1 2 is an example of forming a fixed portion of the seal portion 8 or a part of the fixed portion. In the case of the annular body 1 2, the rotary shaft 4 is also in a clearance fit relationship. Moreover, the relationship between the annular body 1 2 and the rotating shaft 4 is set in a biased state as shown in FIG. The relationship between the annular body 1 2 and the seal portion 8 will be described in detail. A joint portion between the annular body 1 2 and the seal portion 8 is configured to prevent passage of gas between the motor chamber M and the gas compression chamber C. Has a sealing function. When the rotary shaft 4 collides with the other annular body 1 2 and an excessive rotational force is applied to start sliding contact, the coupling between the two is released. As described above, since the center of the annular body 1 2 is deviated from the center of the rotating shaft 4, when the sliding is performed between the annular body 1 2 and the seal portion 8, the rotating shaft 4 is caused by sliding wear. Rotational energy is absorbed so that a gap is generated at the press-fitting portion between the seal portion 8 and the displacement is further deviated as described above, so that a constraint remains between the annular body 12 and the seal portion 8. 3 and 4 are the same as those shown in FIG. 6 and are not described in detail.
[Example 2]

This embodiment is shown in FIG. The feature of this embodiment is an example in which the annular body 13 in the form of the bushing further has a chipped portion K 2 and has an unbalanced shape as a whole. Due to this unbalance, the unbalanced state further deteriorates and becomes noticeable due to contact with the rotating shaft 4, thereby making it impossible to rotate the rotating body (the rotating shaft 4, the turbo blade 7, etc.) in the rotating device. Also in this embodiment, the material of the annular body 1 3 is made of a material softer than the material of the rotating shaft 4, so that the fusion of the rotating shaft 4 to the annular body 1 3 is ensured. In FIG. 5, parts denoted by the same reference numerals as those in FIG. 6 are the same as those in FIG. 6, and detailed description thereof is omitted.
[Example 3]

As a third embodiment of the turbo rotating device provided by the present invention, although not shown in the drawings, in each of the embodiments described above, an annular body that receives contact or collision, specifically, the annular body of FIG. 2, the annular body 1 1 in FIG. 2, the annular body 1 2 in FIG. 3, and the annular body 1 3 in FIG. 4 are installed in a fixed portion that is a partition wall that surrounds the rotating shaft 4 in the rotating device. In order to prevent the rotational energy applied to the annular bodies 1 0 to 1 3 from being propagated to the holding portion when they are in contact with each other, the fitting between the two members is press-fitted, or the two members are fixed by screwing and fastening. And When rotational energy is applied to the annular bodies 10 to 13 due to contact or collision of the rotating body, energy is used for bending / shearing the fitting part sliding or screwing at the screw fastening part in each configuration. This prevents excessive energy from being applied to the housing 1.

The features of the turbo rotating device provided by the present invention are as described in detail above, but are not limited to the above and some illustrated examples, and include various modified embodiments. The present invention resides in that the annular bodies 10 to 13 that are subject to contact and collision when the rotating shaft 4 fluctuates and tilts are installed in a fixed portion surrounding the rotating shaft 4 in the rotating device. It is not limited to the one separated from 1, and can be constituted by an annular body formed integrally with the housing 1. Alternatively, a fixed portion that extends in a form that surrounds a part of the housing 1 with respect to the rotating shaft 4 from the outside is formed, and an annular body is fixed to the fixed portion, or the fixed portion is configured as an annular body. You can also. As the material of the annular body, an aluminum material or an aluminum alloy material other than the lead material can be used. In the case of an embodiment in which an annular body is installed in the seal portion 8, a labyrinth type sealing means can be provided on the inner peripheral surface of the annular body.
The turbo rotating device provided by the present invention can be applied not only to a gas circulation blower in a gas laser oscillator device, but also to a simple vacuum pump.

It is a longitudinal cross-sectional view which shows the structure of the turbo type rotary apparatus which a reference example provides 1st. It is a longitudinal cross-sectional view which shows the structure of the turbo type | mold rotary apparatus which a reference example provides 2ndly. It is a longitudinal cross-sectional view which shows the structure of the turbo type | mold rotary apparatus which this invention provides 1st . It is a figure which shows the principal part cross section of the Example shown in FIG. It is a longitudinal cross-sectional view which shows the structure of the turbo type | mold rotary apparatus which this invention provides 2nd . It is a longitudinal cross-sectional view which shows schematically the structure of the conventional turbo type | mold rotary apparatus.

DESCRIPTION OF SYMBOLS 1 Housing 1 C Fixed part 1 F Fixed part 1 K Intake port 1 H Exhaust port 1 Y Oil tank 2 Motor 2 K Electrode coil 2 M Rotor 3 Inverter 4 Rotating shaft 4 H Hollow hole 4 S Mounting shaft 4 T Injection hole 5 Upper bearing 6 Lower bearing 7 Turbo blade 8 Seal portion 8 A Through hole 9 Bearing holding member 9 B Bolt 9 H Through hole 1 0 Ring 1 0 Ring 1 1 Ring 1 1 H Inner hole 1 2 Ring 1 3 Ring Body K Chipped portion C Gas compression chamber L Oil M Motor chamber S Seal portion R Exhaust pipe

Claims (3)

A turbo blade is attached to a rotary shaft that is driven to rotate by a rotational drive source, a turbo mechanism that performs a pump function by the rotation of the turbo blade and a partition that separates the rotational drive source from the turbo mechanism are provided. In the turbo type rotary device in which the rotating shaft passes through the part, an annular body having an inner peripheral surface that surrounds the rotating shaft in the vicinity of the outer peripheral surface is installed in the penetrating portion of the partition wall through which the rotating shaft passes. When an abnormality occurs in support of the rotating shaft and the rotating shaft fluctuates or tilts, the annular body is damaged or deformed by receiving the rotating shaft and absorbs rotational energy of the rotating shaft. The annular body is held via a fixed holding member capable of suppressing energy propagation with respect to the housing when a load is applied to the partition wall in the rotational direction. Equipment. Annular body turbo rotating device according to claim 1, wherein that the axis is placed offset relative to the axis of the rotating shaft. Annular body turbo rotating device according to claim 1, characterized in that it is constituted by a shape with the cut portion of the material.

Images