JP2507314Y2 - Bearing structure of rotating machine - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing structure of a rotating machine for preventing seizure of the bearing and contamination of lubricating oil due to invasion of dust from outside air into the bearing portion of the rotating machine.

[0002]

2. Description of the Related Art The conventional oil lubrication system for rotating machines is shown in FIG.
And shown in FIG. FIG. 3 is a sectional view of a bearing structure surrounding an example thereof, and FIG. 4 is a front view thereof. In FIGS. 3 and 4, 1 is a shaft, and 2 and 3 are oil drainers, which are fitted on the shaft 1 so as to sandwich the bearing 6 from both sides. Reference numeral 7 is a tightening nut, which is screwed to the shaft 1 to prevent the oil drainers 2 and 3 and the bearing 6 from moving in the thrust direction. An outer cover 4 is attached to the outside of the rotating machine, and an inner cover 5 is attached to the inside of the rotating machine. Reference numeral 8 is a housing of the bearing 6, and an oil supply pipe 9 is attached to the housing 8. Reference numeral 11 denotes an oil sump tank. Lubricating oil supplied from the oil supply pipe 9 returns to the inside of this tank through a circulation path shown by an arrow in the figure, and finally reaches an oil discharge port 11a of the oil sump tank 11. The oil is discharged from the combined oil discharge pipe 12. Reference numeral 10 denotes a screw plug that closes the outer peripheral hole of the inner cover 5 so that the outside air guided from the outside of the rotating machine to the inner cover 5 does not leak into the inside of the rotating machine. Next, the oil lubrication method in the conventional bearing structure will be described. Lubricating oil supplied by an oil supply device or the like is first guided to an oil supply pipe 9 attached to the housing 8. The lubricating oil guided to the oil supply pipe 9 is injected and supplied from the nozzle hole provided in the oil supply pipe 9 toward the bearing 6. The lubricating oil injected and supplied to the bearing 6 is an annular space provided between the outer circumference of the oil drainer 2 and the inner circumference of the outer cover 4.
Almost all the amount is introduced into the annular space 3a provided between the outer circumference of the oil drainer 3 and the inner circumference of the inner cover 5, and thereafter each annular space
Oil drainage holes 4b and 8b and oil drainage holes 5b and 8b connected to 2a and 3a
Then, the oil is guided to the oil reservoir 8a provided in the housing 8. On the other hand, the lubricating oil that has exuded from the slight gap between the inner circumference of the outer cover 4 and the outer circumference of the oil drainer 2 is guided to the annular space 4a provided in the outer cover 4 and then conducted to the annular space 4a. It is guided to the oil reservoir 4d from the existing oil drain hole 4c. Similar to the above,
The lubricating oil that has exuded through a slight gap between the inner circumference of the inner cover 5 and the outer circumference of the oil drainer 3 is guided to the annular space 5a provided in the inner cover 5 and then discharged to the annular space 5a. It is guided from the oil hole 5a to the oil reservoir 5d. The oil sump portion 8a of the housing, the oil sump portion 4d of the outer cover and the oil sump portion 5d of the inner cover penetrate each other, and the lubricating oils guided to these oil sumps are merged and provided on the outer cover 4. From the oil drain hole 4e to the oil reservoir tank 11, and finally is returned to the oil supply device outside the rotary machine through the oil drain port 11a of the oil reservoir tank 11 and the oil drain pipe 12 connected to the oil drain port 11a. . On the other hand, the annular space 5a provided in the inner cover 5 serves as a room X that also serves as an air storage room for guiding and storing the outside air outside the rotating machine, whereby the inner cover portion and the outer cover portion of the rotating machine are provided. The difference in air pressure between them is kept small, and the occurrence of oil flow caused by the flow of air in the bearing and the oil flow induced thereby is prevented. Ring space of the inner cover 5
The outer cover 4 has a plurality of ventilation holes 4x, and the inner cover 5 has a plurality of ventilation holes 5x so as to communicate with the ventilation holes 8x of the housing 8 in order to guide outside air to the housing 5a. It is provided.

[0003]

However, the oil lubrication system having such a structure has the following drawbacks. As shown in FIG. 3, the conventional chamber for storing the outside air is provided adjacent to the lubricating oil circulation path or the seal portion such as the inner diameter side of the inner cover. For this reason, while the outside air is introduced from the outside of the rotating machine to the air reservoir for a long time to be ventilated, dust and the like in the outside air gets mixed into the lubricating oil, causing contamination of the lubricating oil as well as the sealing portion of the lubricating oil. It causes rough damage and even seizure of the bearing. The present invention was devised in view of the above-mentioned points, and the purpose thereof is to provide a room for storing the air of the outside air separately from the circulation path of the lubricating oil and the seal portion, and thereby to collect dust in the outside air. It is intended to provide a bearing structure for a rotating machine in which the above and the like are not mixed in the lubricating oil.

[0004]

[Means for Solving the Problems] That is, the means for achieving the object is to provide a plurality of ventilation holes in the housing portion for guiding the outside air to the inner cover rear surface side of the rotating machine in the oil-lubricated rotating machine bearing structure. A shield plate is provided on the shaft to prevent the outside air guided to the back side of the inner cover from flowing into the inside of the rotating machine to form a room for storing the outside air. The oil is prevented from leaking by being released from the lubrication path or the seal portion to reduce the air pressure difference between the inside and the outside of the rotating machine.

The operation will be described together with the following embodiment. An embodiment of the present invention will be described below in detail with reference to the drawings.

[0005]

1 is a sectional view of a bearing structure according to an embodiment of the present invention, and FIG. 2 is a front view thereof, in which the same reference numerals as those in FIG. 3 have the same functions. Since the oil lubrication system for the rotating machine according to the present invention is exactly the same as the oil lubrication system described for the bearing structure of the conventional rotating machine shown in FIG. 3, the description thereof is omitted and the outside air outside the rotating machine is guided. The construction of the present invention of the chamber for storing air will be described in detail below. 1 and 2, a plurality of ventilation holes 8y are provided in the housing 8 as shown in FIG. 2 to guide the outside air outside the rotating machine to the back side of the inner cover 5 of the rotating machine. A shield plate 13 is fitted on the shaft 1 in order to prevent the outside air guided from the ventilation hole 8y from flowing into the inside of the rotating machine. The room Y for storing the outside air has a housing 8 and a shield plate. 13
It is composed of the shaft 1 and the inner cover 5, and is provided at a place separated from the lubricating oil circulation path or the seal portion. In such a configuration, since the circulation path of the lubricating oil and the outside air are separated from each other, dust and the like in the outside air will not be mixed into the lubricating oil.

[0006]

As described above, according to the present invention, the chamber for storing the outside air is different from the place where the conventional chamber for storing the air is provided, and the bearing oil is circulated in the circulation path of the bearing or the portion separated from the seal portion. It has been made. Therefore, even when outside air is introduced from the outside of the rotating machine to the air chamber for a long time and ventilated in the room of the air reservoir described above, in the present invention, the rubber or the like in the outside air is not mixed into the lubricating oil, and the lubricating oil In addition to pollution, it is possible to prevent rough damage to the lubricating oil seal and seizure of the bearing.

[0007]

[Brief description of drawings]

FIG. 1 is a cross-sectional view around a bearing showing an embodiment of the present invention.

FIG. 2 is a front view thereof.

FIG. 3 is a sectional view of a bearing structure surrounding a conventional example.

FIG. 4 is a front view thereof.

[0008]

[Explanation of symbols]

 1 shaft 2 oil remover 3 oil remover 4 outer cover 5 inner cover 6 bearing 7 tightening nut 8 housing 9 oil supply pipe 10 screw stopper 11 oil reservoir 12 oil drain pipe 13 shield plate X room Y room

Claims (1)

(57) [Scope of utility model registration request] 1. In an oil-lubricated rotating machine bearing structure, a plurality of vent holes for guiding outside air to the back side of the inner cover of the rotating machine are provided in the housing part, and the outside air introduced to the back side of the inner cover is the rotating machine. A shield plate to prevent it from flowing into the inside of the shaft is fitted to the shaft to form a chamber for the air reservoir for the outside air, and this air reservoir chamber is released from the oil lubrication path or seal to allow A bearing structure for a rotating machine, characterized in that an air pressure difference between the inside and the outside is reduced to prevent oil leakage.