JP6708166B2 - Oil bath type rotating machine and method of collecting lubricating oil - Google Patents

Description

The present invention relates to an oil bath type rotating machine such as a reducer, a pump, a turbine, and a transmission that lubricates a bearing and a rotating member with a lubricating oil supplied from an oil bath in a casing, and a method for collecting lubricating oil. ..

An oil bath that stores lubricating oil inside the casing, and an oil bath type rotary machine such as a reducer, pump, turbine, or transmission that lubricates bearings and the like with the lubricating oil supplied from the oil bath Alternatively, there is a mechanism for scraping up the lubricating oil by a gear that rotates together with the shaft portion such as the output shaft, an oil ring, an oil slinger, etc., to prevent leakage of the lubricating oil between the shaft portion and the casing. The part is sealed by a shaft sealing device.

By the way, the conventional oil bath type rotary machine as described above has the following problems.

That is, the shaft sealing device used in this type of rotary machine slides on the outer surface of the shaft portion, and if abrasion at the sliding portion progresses and leakage of lubricating oil is confirmed, It is necessary to judge that the life has come to the end and replace it with a new shaft sealing device, and at that time, the equipment must be stopped.

In particular, in oil bath type rotary machines used in large-scale facilities such as steel mills, wear of the shaft itself cannot be avoided due to long-term operation. In many cases, leakage cannot be prevented, and in addition to replacement of the shaft seal device, maintenance of the shaft parts such as the input shaft and output shaft, and overhaul including replacement are inevitable, resulting in production shutdown due to long-term facility stoppage. There was an unavoidable situation, and the rise in maintenance costs was inevitable.

As a prior art related to this point, for example, in Patent Document 1, a lubricating oil receiving portion that receives lubricating oil that has leaked through the oil seal is provided on the axially outer side of the oil seal, and communicates with this lubricating oil receiving portion. A shaft seal part structure of an oil bath lubrication type transmission device provided with a transparent lubricating oil leak detection container has been proposed. Further, in Patent Document 2, a lubricating oil splashed up by a large gear is collected and circulated in the reducer to adjust the immersion height of the gear in the reducer. Proposes an oil leakage prevention structure that collects and circulates lubricating oil that has leaked from a through hole in which a bearing monitoring sensor is arranged.

However, all of the techniques proposed in Patent Documents 1 to 3 above confirm the leakage of the lubricating oil from the shaft sealing portion from the outside and, when the life of the shaft sealing device is reached, replace it. This is based on the premise that additional lubrication of lubricating oil is performed as necessary, and does not deal with the above-mentioned problems.

JP, 2005-188729, A Japanese Utility Model Publication No. 1-106671 JP-A-3-163218

An object of the present invention is to allow a shaft seal device, even if a leakage of lubricating oil due to wear of a shaft portion occurs, to continuously operate without replacement or additional lubrication of lubricating oil. We are proposing a possible oil bath type rotating machine and a method of recovering lubricating oil.

The present invention relates to at least one shaft portion that is rotatably supported by a housing via a bearing and one end of which is exposed from the inside of the housing to the outside, and the shaft that is linked to the shaft portion inside the housing. And a shaft sealing device having an outer edge portion fixedly held in a liquid-tight state in the housing and an inner edge portion slidably contacting the shaft portion to form a shaft sealing portion. In an oil-bath type rotary machine that is provided with a lubricating oil supplied from an oil bath provided inside the housing, and lubricates the bearing and the rotating member, the exposed portion of the shaft portion is provided in the shaft sealing device. An opening having an opening for passing therethrough is provided to cover the entire area of the shaft sealing device to form a closed space inside thereof.
The enclosure and the oil bath are connected to each other by a recovery path for returning the lubricating oil leaking into the closed space through the shaft sealing device toward the oil bath. It is an oil bath type rotating machine.

In the oil-bath type rotary machine having the above structure, the enclosure has a wall portion having an opening through which the exposed portion of the shaft portion passes, and a peripheral wall integrally connected to an outer peripheral edge of the wall portion and surrounding the shaft sealing device. And a flange that is integrally connected to the peripheral wall and is fitted to the outer wall surface of the housing to form a closed space inside the peripheral wall and the wall portion, and the peripheral wall has a lubricating oil at its lowermost end. it has a discharge opening of, also, the walls of the enclosure, wall and flange, and made of a combination structure with a mating surface of at least 2 divides the opening.
Further, the shaft sealing device is preferably an oil seal.

Further, in the present invention, when the lubricating oil is recovered in the oil bath type rotary machine, the lubricating oil leaked into the enclosed space of the enclosure through the shaft sealing device is connected to the enclosure and the oil bath. It is a method of recovering lubricating oil, characterized by returning the oil to the oil bath through a route.

Even if lubricant oil leaks from the shaft seal due to wear of the shaft seal device or shaft, the leaked lubricant is returned to the oil bath through the recovery path from the enclosed space in the enclosure. The oil bath type rotary machine can be continuously operated without additional lubrication.

It is the figure which showed typically the embodiment of the oil bath type rotary machine according to this invention about the principal part, (a) is a front view, (b) is the figure which showed the side surface by the cross section. It is the perspective view which showed the external appearance of the enclosure provided in the shaft sealing part of the oil bath type rotary machine shown to Fig.1 (a)(b) with the shaft part. It is the figure which showed the example which applied the oil bath type rotary machine according to this invention to the oil bath type reduction gear used in an iron mill.

Hereinafter, the present invention will be described more specifically with reference to the drawings.
1(a) and 1(b) are diagrams schematically showing an essential part of an embodiment of an oil bath type rotary machine, and FIG. 2 is an oil bath shown in FIGS. 1(a) and 1(b). It is an external appearance perspective view which displayed the external appearance of the enclosure provided in the shaft sealing part of a rotary electric machine with the shaft part. 1(a), (b) and FIG. 2 have a shaft part (an input shaft, an output shaft, etc.) that penetrates the wall part of the housing and is exposed from the inside to the outside. The shaft-sealing structure in which the shaft is sealed is taken as an example, but in a rotary machine provided with a plurality of shafts, the shaft-sealing structure is applied to each shaft.

The oil-bath type rotary machine of the present invention includes an oil bath in which lubricating oil is stored inside a casing, and the oil bath is lubricated by a gear, an oil ring, or an oil slinger that rotates together with an input shaft, an output shaft, and the like. It refers to a speed reducer, a pump, a turbine, a transmission, or the like that scoops up oil to lubricate a bearing and a rotating member linked to a shaft portion.

Reference numeral 1 in FIGS. 1 and 2 denotes a shaft portion that is rotatably supported by the housing h via a bearing J and has one end exposed from the inside of the housing h toward the outside. Although not shown, the shaft portion 1 has a rotating member (gear or the like) that rotates in cooperation with the shaft portion 1 inside the housing h.

The bearing J may be mounted on a bearing box J1 that constitutes a part of the housing h and fixed to the housing h, or may be fixed directly on the housing h without using the bearing box J1.

Reference numeral 2 is a shaft sealing device that forms a shaft sealing portion between the housing h and the shaft portion 1. In this shaft sealing device 2, an outer edge portion 2a is fixedly held in a liquid-tight state in a housing h (or a bearing box J1), and an inner edge portion 2b slidably contacts around the shaft portion 1, such as rubber. An oil seal such as an MG seal made of an elastic member is used. Here, the MG seal refers to a shaft sealing device which has a cut portion at least at one position in the circumferential direction and which can be attached and detached without disconnecting a coupling for connecting the shaft portions. As the shaft sealing device 2, an oil seal, a mechanical seal, a packing, an O-ring or the like can be used. As the oil seal, an SB seal or an SC seal can be used in addition to the MG seal, but it is preferable to use the MG seal because it has a cut surface and can be easily removed.

Further, 3 is an oil bath provided inside the housing h, 4 is fixedly held by the shaft portion 1, and rotates in synchronization with the shaft portion 1 to scrape up the lubricating oil in the oil bath 3 and apply the lubricating oil to the bearing J. An oil slinger to supply.

Further, reference numeral 5 is an enclosure provided in the shaft sealing portion. The enclosure 5 has an opening 5a that allows the exposed portion of the shaft portion 1 to pass therethrough, and covers the entire area of the shaft sealing device 2 to form a sealed space P inside thereof.

Specifically, the enclosure 5 includes a wall portion 5b having the opening 5a, a peripheral wall 5c integrally connected to the outer edge portion of the wall portion 5b and surrounding the shaft sealing device 2, and an outer wall surface of the housing h (bearing box J1 Mating surface n that can be fixed to the inner wall 5c through a fastening means such as a bolt, and is composed of a peripheral wall 5c and a flange 5d that cooperates with the wall portion 5b to form a closed space P inside thereof and divides the opening 5a into two. A combined structure formed of, for example, an upper member and a lower member is applied. When the enclosure 5 is a combined structure including an upper member and a lower member, both are integrated by fastening means such as bolts and nuts.

Further, 6 is a discharge hole provided at the lowermost end of the peripheral wall 5c of the enclosure 5 for discharging the lubricating oil, and 7 is a recovery path in which one end is connected to the discharge opening 6 and the other end is connected to the oil bath 3. Is. When the lubricating oil leaks from the shaft sealing portion due to the failure of its function due to the wear of the shaft sealing device 2, the leaked lubricating oil passes through the closed space P, the discharge opening 6, and the recovery path 7, and the oil is discharged. Returned to bus 3 and collected. The other end of the recovery path 7, especially the connection part (lubrication oil recovery end) 7a with the oil bath 3 is shown above the oil surface of the oil bath 3 as an example. 7a may be located below the oil level of the oil bath 3.

In the oil bath type rotary machine according to the present invention, even if the lubricating oil leaks from the shaft sealing portion due to wear of the shaft sealing device 2 or the like, the lubricating oil leaks through the discharge opening 6 and the recovery path 7 provided in the enclosure 5. Lubricating oil can be collected and circulated (the scattering of lubricating oil to the outside is prevented), and the rotary machine can be operated for a long period of time without additional lubrication.

Further, by making the enclosure 5 a split type combination structure having a mating surface n, a coupling for connecting the shaft portions (for example, the shaft portion of the drive source and the input shaft or output of the speed reducer or the like). The enclosure 5 can be attached and detached without disconnecting a chain coupling etc. for connecting to the shaft, and in particular, it can be easily attached to an existing rotary machine.

In the embodiment of the present invention, although the enclosure 5 is divided into two, it is shown as an example, but it is also possible to apply a combination structure divided into three or more, and this point is not particularly limited.

FIG. 3 shows a raw material conveying belt conveyor used in a steel mill, and an output shaft of an oil bath type speed reducer R arranged between a drive shaft and a drive source (motor or the like) for driving the drive shaft. It is the figure which showed the other example of the oil bath type rotary machine according to this invention which applied the shaft sealing device 2 to 1a and the input shaft 1b. Reference numeral 8 in the drawing is an oil level gauge that displays the amount of lubricating oil in the oil bath 3.

In a conventional speed reducer, after 20 to 30 years of operation, the shaft sealing effect of the shaft sealing device can hardly be expected, and the leakage of lubricating oil from the shaft sealing portion is unavoidable. It was necessary to perform additional lubrication once every three weeks in order to avoid damage to the rotating member of the above, but in the oil bath type speed reducer R which is an oil bath type rotating machine according to the present invention, additional lubrication is performed. It was confirmed that it is possible to continue operating without any need, and the cost (cost for lubrication) required for it can be eliminated.

Further, in the case of the conventional speed reducer, overhaul is required when the operating period reaches about 30 years, but in the oil bath type speed reducer R according to the present invention, the overhaul due to oil leakage is not necessary.

According to the present invention, an oil bath type rotating machine such as a speed reducer, a pump or a turbine used in a large-scale facility such as a steel mill can be continuously operated even if a lubricating oil leaks from its shaft seal portion. It is possible to provide an oil bath type rotating machine that can be operated as a unit and a method for collecting lubricating oil.

1 Shaft 1a Output Shaft 1b Input Shaft 2 Shaft Sealing Device 2a Outer Edge 2b Inner Edge 3 Oil Bath 4 Oil Slinger 5 Enclosure 5a Opening 5b Wall 5c Peripheral Wall 5d Flange 6 Discharge Opening 7 Recovery Route 7a Connection 8 Oil Gauge J Bearing J1 Bearing box h Housing P Closed space R Oil bath type reducer

Claims (2)

At least one shaft portion rotatably supported by the housing via a bearing, one end of which is exposed from the inside of the housing toward the outside, and the inside of the housing, which is linked to the shaft portion and is rotatable together with the shaft portion. A rotary member, an outer edge portion fixedly held in the housing in a liquid-tight state, and an inner edge portion slidably contacting around the shaft portion to form a shaft seal portion. In an oil bath type rotary machine that lubricates the bearing and the rotating member with a lubricating oil supplied from an oil bath provided inside
The shaft sealing device is provided with an enclosure that has an opening that allows an exposed portion of the shaft portion to pass therethrough and that covers the entire region of the shaft sealing device and forms a sealed space inside thereof.
The mutual between該囲physician and the oil bath, Ri lubricating oil leaked into the sealed space through the shaft sealing device name connected with recovery path for returning toward the oil bath,
The enclosure includes a wall portion having an opening for passing an exposed portion of the shaft portion, a peripheral wall integrally connected to an outer peripheral edge of the wall portion and surrounding the shaft sealing device, and an outer peripheral surface of the housing integrally connected to the peripheral wall. It is composed of a peripheral wall that fits the wall surface, and a flange that cooperates with the wall portion to form a sealed space inside thereof, the peripheral wall having a lubricating oil discharge opening at the lowermost end thereof, and the wall of the enclosure. The oil bath rotary machine , wherein the part, the peripheral wall and the flange are composed of a combined structure having a mating surface that divides the opening into at least two parts . In recovering the lubricating oil in the oil bath type rotary machine according to claim 1 , the lubricating oil leaked into the enclosed space of the enclosure through the shaft sealing device is connected to the enclosure and the oil bath. A method for recovering a lubricating oil, which comprises returning the oil to the oil bath through a route.

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