JPH02125108A - Bearing device for horizontal shaft rotating machine - Google Patents

Abstract

PURPOSE:To prevent contamination of air, and to achieve effectiveness for oil supply for lubricating and cooling by providing an oil chamber on the side of surface periphery of a single disc type thrust bearing that is provided on both sides of a disc, and by communicating the bottom of the thrust bearing to an inlet port of a pump case to arrange it constantly in oil. CONSTITUTION:On both sides of a disc 7 provided on a turning shaft 1, a disk type thrust bearing 3 of larger diameter is arranged so as to form a ring shaped oil chamber 12 on the side of surface periphery and to communicate the bottom of the thrust bearing to a bypass 13 opened at an inlet port 9a of a pump case 8. The bottom of the thrust bearing 3 is so arranged to be constantly in oil. Contamination of air in a pump chamber is prevented, and the oil supply for lubricating and cooling each bearing can thus be performed effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotating machine with a horizontal axis, and more particularly to a bearing oil supply device that stores lubricating oil in an oil tank and uses the rotation of a main shaft to oil a bearing part. .

[Conventional technology]

Japanese Utility Model Application Publication No. 198798/1983 has proposed a conventional self-lubricating structure using a viscous pump that utilizes the viscosity of lubricating oil. The structure of this bearing device is that a rotating shaft with a shaft collar is housed in a bearing case that stores lubricating oil, and this rotating shaft is connected to a journal bearing set in a bearing housing.
And supported by a thrust bearing. Further, an oil guide ring constituting the viscous pump is fixed to the bearing housing on the outer periphery of the shaft collar, and the lower part thereof is immersed in oil.

Furthermore, an oil supply hole is provided in the lower part of the bearing housing, and a through hole is provided in the upper part. This method uses a viscous pump action composed of a shaft collar and an oil guide ring, and the oil sucked in from the oil supply hole goes around the gap between the shaft collar and the oil guide ring, and then flows through the notch at the bottom of the oil guide ring to the bearing. The oil is introduced into the oil chamber provided in the housing, and as the oil level rises, it lubricates and cools the entire journal and thrust bearing while being immersed, and penetrates the end of the journal bearing and the upper part of the oil chamber. It is expelled from the hole.

Therefore, the capacity of the viscous pump is journal bearing.

A sufficient amount of oil is required to lubricate and cool the thrust bearing, and pumping capacity is required to maintain the oil level up to the through hole. Expands the area of the flow path formed between the outer circumference of the shaft collar and prevents side leakage.

[Problem to be solved by the invention]

In general, viscous pumps have a small self-priming ability and have a low pump internal pressure, so they have the disadvantage that air is easily mixed in.

When an air layer is formed in the pump chamber, the pump capacity decreases significantly and eventually the pump loses its function.

For this reason, in the prior art, lubricating oil is introduced into a bearing housing that houses the journal and thrust bearing, and the oil level is raised to maintain an oil level that immerses the entire bearing part in the oil, thereby performing a lubricating action.

Therefore, during steady rotation, the shaft collar also rotates under the oil surface and agitates the lubricating oil in the bearing housing, so an increase in the temperature of the lubricating oil is an unavoidable problem.

An object of the present invention is to provide an oil chamber in a thrust bearing part arranged on both sides of a viscous pump to form a bypass communicating with the suction part of the viscous pump in a bearing device that supplies oil to a bearing part using the rotation of a main shaft. By doing so, the viscous pump operates and introduces oil into the oil chamber, stirring the lubricating oil and preventing air from entering the pump chamber, making it possible to efficiently supply a sufficient amount of oil to the bearing. The purpose is to provide a good viscosity pump.

[Means to solve the problem]

The above purpose is to make the width of the rotating disk smaller than the width of the pump case in the pump case and rotating disk that make up the viscous pump, and to install a single thrust bearing located on both end surfaces of the disk that supports the axial thrust. It is shaped like a disk, has a diameter larger than the disk diameter, and is placed adjacent to the pump case. Then, a circumferential oil chamber is formed on the outer circumferential side of the thrust bearing, and this oil chamber is placed facing the radial gap between the disk and the pump case, and a pump-in type spiral group is formed on the end surface of the disk. is formed. Furthermore, this is achieved by configuring the lower part of the oil chamber to be in communication with a bypass duct provided at the suction port at the lower part of the pump case, and to be always submerged in oil.

[Effect]

Initially, the oil level is set so that a portion of the disk is immersed, so as the main shaft rotates, the viscous pump operates and pumps up the lubricating oil stored in the lower part of the casing. Most of this pumped oil flows through the pump oil chamber formed on the inner diameter surface of the pump case, and is introduced into the upper tank from the discharge port.

It is then supplied to the journal bearing section.

On the other hand, a pump-in type spiral group is machined on both sides of the disk, and an oil chamber is formed on the sliding surface of the thrust bearing placed opposite the spiral group.
A viscous pump action is also induced on the side surface of the disk, and oil is introduced from the bypass section that communicates with the suction port, which is always below the oil level.

Therefore, due to the pump effect acting on the side surface of the disk, oil is introduced into the oil chamber and an oil layer is formed. Since the pressure inside this chamber is higher than atmospheric pressure and equal to the internal pressure of the pump case, it is possible to prevent side air from entering the pump case and prevent side leakage of oil flowing inside the pump case. And the oil necessary for lubrication can be efficiently supplied to the thrust bearing section.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

Figure 1 is a longitudinal sectional view, Figure 2 is a new view of the lower half of the viscous pump and thrust bearing that constitute the bearing device in Figure 1, and Figure 3 is a new view of the lower half of the viscous pump and thrust bearing that constitute the bearing device in Figure 1.
The figure is a plan view of the thrust bearing and the disk set, FIG. 4 is a diagram of oil film pressure during rotation, and FIG. 5 is a longitudinal sectional view of the bearing device.

In FIG. 1, 1 is a rotating main shaft used for example in a horizontal-shaft water turbine, 2 is a journal bearing, 3 is a thrust bearing, and 4
is the bearing housing, 5 is the casing, 6 is the lubricating oil, 7 is the rotating disk, 8 is the pump case, 9a is the suction port, 9b
1 is a suction pipe, loa is a discharge port, 10b is a discharge pipe, and 11 is a pump oil chamber.

12 is an oil chamber, 13 is a bypass, 14 is a spiral group, 15 is an upper tank, 16 is an oil guide, 17 is an oil drainage chamber, and 18 is an oil absorption chamber.

19 is an oil supply hole, 2o is an introduction hole, 21 is a drain pipe, 22 is an oil stopper, 23 is a heat sink, 24 is a labyrinth seal, 25 is a through hole, 26 is a discharge side hole, and 27 is a distribution hole.

The rotating main shaft 1 is rotatably supported by a divided journal bearing 2 contained in a bearing housing 4 within a casing that is divided into upper and lower parts, and a part of which has a rotating disk having a larger diameter than the journal part. 7 is formed, and a pump case 8 having a predetermined gap is placed on the outer periphery of the pump case 8 and guided by a part of the spigot provided in the bearing housing 4, thereby forming a viscous pump. Here, as shown in FIG. 2, the width dimension of the rotating disk 7 is made smaller than the pump dimension, and (
The thrust bearings 3, which are located on both sides of the rotating disk 7 and support the axial thrust in the left-right direction, are shaped like a single disk, have a diameter larger than the diameter of the disk 7, and have a diameter larger than that of the pump case 8. They are placed in contact with each other on both sides and are positioned using keys, etc.

A pump oil chamber 11 is formed at the center of the inner circumferential surface of the pump case 8 in a substantially symmetrical manner over half the circumference from the lower end to the upper end. In addition, in the pump oil chamber 11, a suction port 9a and a suction pipe 9b which are always below the oil level, and a discharge port 10a and a discharge pipe 10b are provided above, and an upper tank 15 is provided.
It communicates with Furthermore, disk 7 and pump case 8
An oil chamber 12 is formed in a circumferential shape on the outer peripheral side of the thrust bearing 3 facing the gap between the pump case 8 and the suction port 9a of the pump case 8. It is connected to bypass 13.

The lower part of the casing 5 stores lubricating oil 6 and is divided into an oil drain chamber 17 and an oil absorption chamber 18 by an oil guide 16, and the lower end of the suction pipe 9b is arranged at the lower bottom on the oil absorption chamber 18 side. A through hole 25 is opened in the oil drain chamber 17 to keep the oil level balanced.

On the other hand, an oil supply hole 19 and a drain pipe 21 are provided at the bottom of the upper tank 15.The oil supply hole 19 faces the journal bearing 2, communicates with the inner circumferential surface of the journal bearing 2 through an introduction hole 20, and drains the oil. The upper end of the pipe 21 is higher than the upper end of the discharge pipe 10b, and the lower end thereof is arranged to face the outer periphery of the bearing housing 4 containing the journal bearing 2, so that the oil level in the upper tank 15 rises and drains. When it reaches the upper end of the tube 21, it falls onto the bearing housing 4.

In this structure, when the rotating main shaft 1 is started to rotate, the oil level of the lubricating oil 6 is at level a when it is stationary, so the oil flows in the rotating direction due to its viscous frictional action. Pump oil chamber 1 formed by this rotating disk 7 and pump case 8
The oil flowing through the oil chamber 11 is pressurized due to the damming effect of the stepped part at the upper end of the oil chamber 11, and then flows through the discharge port 10a and the discharge pipe 10.
b, flows into the upper tank 15, and enters the oil supply hole 19, and
It is supplied into the journal bearing 2 from the introduction port 20.

Therefore, in a horizontal shaft rotating machine, the oil level is usually lower than that of the journal part in consideration of agitation by the main shaft and oil leakage from the labyrinth seal 24 part, so most of the thrust bearing 3 is placed in the air. However, due to the action of the oil chamber 12 of the thrust bearing 3 and the pump-in type spiral group (Fig. 3) formed in the rotating disk, lubricant and lubricating oil flow as shown by the arrows, and as shown in Fig. 4. As shown in the figure, the pressure oil film CP! peaks at the end of the spiral group. ) occurs, and Pl is P compared to atmospheric pressure Pa.
I) Po , so the air that was in the oil chamber 12 before one rotation is discharged as the main shaft 1 rotates, and during steady rotation, the pressure difference completely prevents air from entering and maintains a good lubrication state.

Therefore, the viscosity pump function can be performed while maintaining the oil level at a low level without raising the oil level, thereby eliminating oil agitation loss and preventing the temperature of the lubricating oil from rising.

In addition, the oil pumped up to the upper tank by the viscous pump action overflows into the oil supply hole 19 and the introduction hole 2.
While the journal bearing 2 is lubricated through the oil chamber 1, the lower part of the thrust bearing 3, that is, the oil chamber 1 is
Since a part of the disc 2 is also in the oil and communicates with the pump suction part via the bypass 13, as the disc 7 rotates, a pumping action due to viscosity is induced on both end faces of the disc 7.
Since oil is introduced into the oil chamber 12 through the bypass 13, the oil is not interrupted during rotation. In addition, since the outer periphery of the spiral group 14 that opens on both end faces of the oil chamber 12 and the disk 7 is filled with an oil layer in an annular shape, the oil chamber 1
The oil in the thrust bearing 2 flows from the outer circumferential side to the inner circumferential side on the sliding surface of the thrust bearing 3, and a pressure oil film is generated in each of the spiral groups 14, which are opened in large numbers, and this dynamic pressure effect causes the thrust bearing 3 to become completely fluid. It is supported in a lubricated state, and after sliding in the groove, it is discharged from the inner circumferential side as shown by the arrow. Incidentally, if an oil stopper 22 is provided in the oil chamber 12 as shown in FIG. 3, the pressure in the chamber 12 and the suction from the bypass 13 can be effectively performed.

It has a lubrication and cooling effect, and the hot oil falls onto the oil surface. However, due to the suction action of the viscous pump, this high-temperature oil does not accumulate on the oil surface of the oil drain chamber 17, but is guided by the oil guide 16 and flows through the narrow wall channel formed on the side wall of the casing 5. The oil flows and is introduced into the oil absorption chamber 18.

When passing through a narrow wall channel, the flow velocity of the oil increases due to the change in the channel area, and the heat transfer is improved by carrying away the accumulated oil that forms the boundary layer on the wall surface, and the heat sink installed on the outer wall. Due to the cooling effect of 23, heat is efficiently radiated from the surface of the casing 5. In this way, by improving the performance of the viscous pump and forming a circulation path within the casing 5, oil stagnation can be eliminated, the oil temperature can be made uniform, the effective cooling wall surface can be increased, and the cooling performance can be improved.

Note that the lubricating oil introduced into the upper tank 15 is supplied to the bearing section 1. For example, even if the oil level rises due to an imbalance between the amount of oil required for the bearing and the amount of introduced oil, the lubricating oil is supplied downward through the drain pipe 21. Since the pump is returned, the oil level does not become a resistance and reduce the amount of pumped oil.

Furthermore, the temperature of the lubricating oil in the upper tank 15 is at least lower than the bearing temperature due to the cooling effect of the wall circulation as described above.
Since the temperature difference is 10° C. or more), a cooling effect can also be obtained by causing the low temperature oil falling from the drain pipe 21 to flow down to the back surface of the bearing housing 4.

〔Effect of the invention〕

According to the present invention, it is possible to prevent air from entering the pump chamber,
Moreover, oil necessary for lubrication and cooling can be efficiently supplied to the journal and the thrust bearing.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an embodiment of a bearing device for a horizontal shaft rotating machine according to the present invention, FIG. 2 is a cross-sectional view of the lower half of the viscous pump and thrust bearing that constitute the bearing device of FIG. 1, and FIG. 4 is a plan view of the combined state of the thrust bearing and disk, FIG. 4 is a diagram showing the form of oil film pressure during rotation, and FIG. 5 is a longitudinal sectional view of the bearing device. 1...Rotating main shaft, 2...Journal bearing, 3...
Thrust bearing, 4... Bearing housing, 5... Casing, 6... Lubricating oil, 7... Disc, 8... Pump case, 9a... Suction port, 10a... Discharge port,
12...Oil chamber 13...Bypass, 1
4...Spiral group, 15...Upper tank,
16...Oil guide. Fig. b Fig. Fig. b

Claims (1)

[Scope of Claims] 1. A viscous pump is constructed by providing a pump case on the outer peripheral side of a disk formed coaxially with the rotational main shaft of the horizontal axis rotating machine, and a thrust and a A bearing device comprising a bearing housing that includes a journal bearing, and a casing that houses the bearing housing, stores lubricating oil in its lower part, and further includes an upper tank in its upper half, wherein: The thrust bearings, which are located on both sides and support the axial thrust, are formed into a single disk shape with a diameter larger than the diameter of the disk, and are arranged in contact with the side surfaces of the pump case, so that the surface of the thrust bearings is A bearing for a horizontal axis rotating machine, characterized in that a circumferential oil chamber is formed on the outer circumferential side, the lower part thereof communicates with a bypass opened at the suction port of the pump case 2, and is always disposed in oil. Device. 2. The bearing device for a horizontal shaft rotating machine according to claim 1, wherein the inner circumferential side of the oil chamber is formed to be inside the outer circumferential portion of the rotary disk. 3. Claim 1, characterized in that an oil stopper is formed at a rotational end portion of the oil chamber.
A bearing device for a horizontal shaft rotating machine as described in . 4. The bearing device for a horizontal shaft rotating machine according to claim 1, wherein pump-in type spiral groups are formed on both end surfaces of the rotating disk facing the thrust bearing. 5. The horizontal shaft according to claim 1, wherein a drain pipe is provided to pass downward through the bottom of the upper tank, and the tip end of the drain pipe faces the back surface of the bearing housing. Bearing device for rotating machines.