JPS58225220A - Thrust bearing device - Google Patents

Abstract

PURPOSE:To radiate the frictional heat of a rotary plate preventing the seizure etc. of a bearing device due to thermal deformation and oil film break of a rotary plate from happening by a method wherein multiple heat pipes are embedded into the rotary plate integrated with the thrust collar provided on a rotary shaft. CONSTITUTION:The rotary shaft 8 of a rotating motor is pivoted on the oil cylinder 2 of an oil tank 1 while a thrust collar 9 is fixed to the rotary shaft 8 by means of a ring key 10. A rotary plate 11 is provided on the lower part 9a of the thrust collar 9 facing to a static plate 6 forming an oil film O1. In such a constitution, multiple heat pipes 16 are embedded into the rotary plate 11 diagonally inward by an angle of theta. Besides, the cooling grooves 17 circulating lubricant are formed on the lower part 9a of the thrust collar 9 located on the junction surface of the rotary plate 11. Through these procedures, the frictional heat generated by rotation of the rotary plate 11 may be actively radiated for cooling by means of heatexchange operation between the heat pipes 16 and the cooling groove 17.

Description

[Detailed Description of the Invention] [Technical Summary of the Invention] The present invention relates to a thrust bearing device for a rotating shaft of a rotary electric machine such as a chamber-shaft type water turbine generator or electric motor, and in particular, the present invention relates to The present invention relates to a cooling device for a rotary plate provided in a thrust collar in an apparatus.

[Technical background of the invention]

In general, as the output capacity of chamber shaft type rotating shafts increases, the load conditions imposed on thrust bearing devices that support the rotation shafts of the chamber shafts of these rotating electric machines are becoming increasingly severe.

On the other hand, the bearing function of this birch thrust bearing device is mainly determined by the sliding speed of the rotary plate incorporated in this thrust bearing device and the state of the thrust load.

Furthermore, under the high load (high load) load conditions due to the increase in size and capacity of the above-mentioned rotating electric machines, the high speed and high load cause the lubricating oil between the rotating plate and the stationary plate to Friction loss within the oil film increases, and as the oil film temperature rises,
Not only will the bearing performance deteriorate, but the stationary plate and rotating plate may undergo complex thermal deformation due to the temperature distribution near the sliding parts (sliding surfaces) of the stationary plate and rotating plate, as well as the temperature gradient in the axial direction. , there is a risk that the thrust bearing performance will be significantly reduced. Furthermore, if the deformation of the rotating plate and the stationary plate becomes large due to heat, oil film rupture will occur on all surfaces of both, resulting in overheating damage to the bearing and the risk of burning out the thrust bearing device. be.

That is, as shown in FIGS. 1 and 2, the thrust bearing device of this type of rotating electrical machine that has already been proposed has an oil tank in which no lubricating oil is supplied! An oil cylinder body 2 is erected in the central part 1a of the oil cylinder body 2, and the upper surface of the oil +Wt close to this oil cylinder body 2 (it)
A flat base plate 3 is provided on the base plate 3, a guide plate 5 having a circumferential groove 4 is fixed on the base plate 3, and a ring-shaped stationary plate 6 is installed in the circumferential groove 4 of the guide plate 5 with a large number of coil springs 7. A rotary electric machine (not shown) is fitted in the oil cylinder body 2 so that it can be raised and lowered freely.
A rotating shaft 8 is rotatably mounted, a thrust collar 9 is fixed to the rotating shaft 8 by a ring key 10, and further,
A rotary plate 11 in the shape of a ring plate is located at the bottom of this thrust collar 9.
is provided so as to face the stationary plate 6 and to generate an oil film 01, and the thrust collar 9
An upper cover 12 that is integral with the oil tank 1 is disposed on the outer periphery of the oil tank 1, and a shaft member 13 and a bearing guide member 14 are attached to the upper cover 12. A plurality of oil pump holes 15 are formed at an angle to pump lubricating oil by centrifugal force.

Therefore, when the rotating shaft 8 rotates, the thrust collar 9
The rotating plate 1 which is integral with the oil film 0. ? : It rotates while sliding on the stationary plate 6 in which a shadow is formed.

[Problems with background technology]

However, in the above-mentioned thrust bearing device, as shown in FIG. 2, when the rotating shaft 8 is loaded with a high speed and a high load 11, the radial temperature distribution of the rotating plate 11 is
As shown by the curve a, the temperature distribution is maximized at the center of the rotating plate 11, and the temperature distribution in the axial direction of the rotating plate 11 and the thrust collar 9 is as shown by the straight line. A temperature gradient is created that becomes smaller as the distance from the sliding surface 11a of the plate 11 increases.

Due to such non-uniform temperature gradient, the rotating plate 11
The curved surface 11a forms a curved surface in the middle as shown by the curve C, and along with this deformed curved surface C, 1. The oil film pressure acting on the stationary plate 6 is significantly large at the center of the stationary member 6, as shown by curve d in FIG. As a result, the minimum thickness of the oil film between the stationary plate 6 and the rotary plate 1j decreases, and there is a risk of burnout.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and a large number of heat pipes are embedded in a rotating plate that is integrated with a thrust collar provided on a rotating shaft to actively absorb frictional heat of the rotating plate. Dissipates heat, prevents thermal deformation of the rotating plate, and also
It is an object of the present invention to provide a thrust bearing device that has excellent thrust bearing performance and is reliable.

[Summary of the invention]

Particularly, in the present invention, a thrust collar is fixed to a rotating shaft, a rotating plate is provided for this thrust force 2- so as to face a stationary plate on plywood, a plurality of heat pipes are embedded in the rotating plate, and a plurality of heat pipes are embedded in the rotating plate. It is constructed by forming cooling grooves for lubricating oil on the joint surface of either the thrust collar or the rotating plate.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An illustrated embodiment in which the present invention is applied to an axle-type rotating electrical machine will be described below.

It should be noted that the present invention will be described with the same reference numerals attached to the same constituent members as in the above-described specific example.

In FIGS. 3 to 6, reference numeral 1 denotes an oil tank for storing loose oil 0, and an oil cylinder 2 is erected in the center la of this oil tank 1. A flat base plate 3 is provided on the upper surface 11) of the oil tank 1 close to the cylinder 2.

A guide plate 5 having a circumferential groove 4 is fixed on the base plate 3, and a ring plate-shaped stationary plate 6 has a large number of coil springs 7 in the circumferential groove 4 of the guide plate 5. It is installed so that it can be raised and lowered freely.

On the other hand, a rotating shaft 8 of a rotating electric machine is rotatably mounted inside the oil cylinder 2, and a thrust collar 9 is fixed to the rotating shaft 8 by a ring key 10. Further, at the lower part 9a of the thrust collar 9, a ring-shaped rotary plate 1 is provided so as to face the stationary plate 6 and to generate an oil film 01. , the oil tank l is provided on the outer periphery of the thrust collar 9.
An upper cover 12 is provided which is integral with the upper cover 12. Furthermore, the upper cover 12 is provided with a mechanical member 13 and a bearing guide member 14. Moreover, the above-mentioned bearing guide member 1
The thrust collar 9 where 4 is located has a plurality of oil pump holes 15 for pumping lubricating oil O by centrifugal force.
is drilled at an angle.

j On the other hand, as shown in FIGS. 3 to 5, a plurality of heat pipes 16 are buried inwardly at an angle θ, and each of the heat pipes 16 The heat pipe 16 is provided with an inclination 17 so that the working fluid filled therein returns to the lower part of the heat pipe 16 by centrifugal force to increase the heat exchange rate.

Further, as shown in FIGS. 3 to 6, a cooling groove 17 through which lubricating oil circulates is formed in the lower part 9a of the thrust collar 9 located on the joint surface of the rotating plate 11.
This cooling groove 17 has a plurality of concentric grooves 17a and a radius gt7.
It is configured such that it communicates with b.

Therefore, when the rotating shaft 8 rotates, the thrust collar 9
The rotary plate 11, which is integral with the rotary plate 11, rotates while sliding on the stationary plate 6 on which an oil film o1 is formed.

Furthermore, the frictional heat generated during this rotation is actively radiated and cooled by heat exchange through the cooperative action of each of the heat pipes 16 and the cooling grooves 17.

〔Effect of the invention〕

As described above, according to the present invention, the thrust collar 9 is fixed to the rotating shaft 8, and the u-roll plate 11 is attached to the thrust collar 9.
are provided so as to face the stationary plate 6 on the base plate 1, a plurality of heat pipes 16 are embedded in the rotating plate 11, and lubricating oil is applied to the joint surface of either the thrust collar 9 or the rotating plate 1. Since the cooling grooves 17 are formed, the rotating plate 11 can be efficiently and actively cooled by heat dissipation, and the temperature distribution in the axial direction can be equalized. Thermal deformation of the rotating plate 11 is eliminated, and at the same time, the oil film thickness is formed to be large and the temperature of all surfaces can be reduced, so there is no risk of oil film breakage, and reliability and performance are improved. I can do it.

4. Brief description of the drawings Figure 1 is a cross-sectional view showing a half of the already proposed streak bearing device, and Figure 2 is a diagram for explaining the operation of the streak bearing device. FIG. 3 is a cross-sectional view showing half of the thrust bearing device according to the present invention, FIG. 4 is an enlarged cross-sectional view showing the essential parts of the present invention, and FIG.
A cross-sectional view taken along the chain line A-A in FIG. 3, and FIG.
It is a cross-sectional view along the chain 1B-B in the figure.

l...oil tank, 2...oil cylinder, 3...base plate, 4...
・Peripheral groove, 5... Guide plate, 6... Stationary plate, 7... Coil spring, 8... Rotating shaft, 9... Thrust collar,
11...To rotation A12...Top cover, 13...Meanwhile member, 14...-11 receiving guide member, 15...
Oil pump hole, 16... Heat pipe, 17...
cooling groove.

Applicant's agent Kiyoshi Inomata Figure 4' -22

Claims (1)

[Claims] 1. A thrust collar is fixed to a rotating shaft, a rotating plate is provided on this thrust collar so as to face a stationary plate on plywood, and a plurality of heat pipes are embedded in the rotating plate, A thrust bearing device characterized in that cooling grooves for lubricating oil are formed on the joint surface of either a thrust collar or a rotating plate. 2. The thrust bearing device according to claim 1, wherein each heat pipe is embedded in the rotary plate so as to be inclined inward. 3. The thrust bearing device according to claim 1 or 2, wherein the cooling groove is configured by communicating with a plurality of concentric grooves and a radius. 1