JPS5999119A - Static pressure thrust bearing of vertical shaft rotary electric machine - Google Patents

Abstract

PURPOSE:To enable to make use of the central part of a rotational disk by supplying high pressure oil to the sliding face of a bearing shoe. CONSTITUTION:Several pressure oil pockets 4b are provided on a sliding face 7 of a bearing shoe 1 around the center to be supplied with high pressure oil uniformly distributed by a discharge control valve 9. This construction approximately equalizes the discharge to the peripheral side from each oil pressure pocket 4b and the thickness of oil film on the sliding face 7, and permits to prevent the lowering of capacity caused by uneven thickness of the oil film even if it is adapted to a large-sized bearing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a hydrostatic thrust bearing for a chamber-shaft rotating electrical machine, and more particularly to a hydrostatic thrust bearing for a chamber-shaft rotating electrical machine installed on the end face of the main shaft.

[Prior art]

Recently, flywheel generators have come into widespread use as one type of large-capacity stimulant rotating electric machines, with a drive motor installed on the top, which speeds up with the drive motor and extracts energy by inertia during deceleration. Ta.

In such indoor shaft generators, as mentioned above, only the drive motor is installed above the generator and nothing is installed below the generator, so the lower end of the main shaft of the generator is connected to the thrust bearing. It can be used as

Currently, a well-known bearing with self-oil film forming ability, that is, a hydrodynamic bearing, is used as a thrust bearing for this part.
In order to form this oil film, a large sliding speed is required on the sliding surface, so hydrodynamic bearings are
As shown in the figure, it is supported by a large number of bearing shoes 1 that are swingably supported. In this case, even if the bearing shoe 1 is provided, the required sliding speed cannot be obtained on the inside of the inner diameter of the bearing shoe 1, so no bearing is provided in this area, and The central part of board 3) was left unused.

For such dynamic pressure bearings, high-pressure oil is pumped between the main shaft and the bearing, and the main shaft is supported by an oil film.In the case of a silent pressure bearing, as shown in Figures 3 and 4, the lower part of the main shaft is Edges can be used. That is, a hydraulic pocket 4 is formed in the center of the bearing shoe 1 that slides on the rotating disk 3, and high-pressure oil from a hydraulic source 5 is guided here through an oil supply pipe 6, and the hydraulic pressure generated in the hydraulic pocket 4 causes the rotational circle to change. Raise the plate 3 and slide the sliding surface 7
An oil film is formed between the rotating disk 3 and the rotary disk 3. In this way, since the central portion of the rotating disk 3 is also used to support the load, the outer diameter of the bearing shoe 1 can be made smaller than that of the above-mentioned hydrodynamic bearing, and a bearing with less loss can be obtained.

However, in this case, the sliding surface 7 of the bearing shoe 1 becomes ring-shaped, so if for some reason the floating of the rotating disk 3 with respect to the sliding surface 7 becomes uneven, the oil film will become thicker in the direction of the outside. Since the high-pressure oil easily flows from the hydraulic pocket 4 to the hydraulic pocket 4, the oil flow on the opposite side decreases, and the oil film thickness decreases, making it impossible to obtain the required lubrication performance. In other words, in a hydrostatic bearing with only one hydraulic pocket 4, the bearing is extremely small and the finishing precision of the bearing shoe 1 and the rotating disk 3 is extremely high, so there is no cause for uneven oil flow. Even if there is sufficient oil supply and there is some deviation in the oil flow, the required oil flow on the opposite side, Y...
It cannot be used unless the film thickness can be ensured.

For this reason, as shown in FIGS. 5 and 6, bearing shoes 1 are used to prevent such unevenness of the oil flow and to form a uniform oil amount and oil film thickness around the entire circumference. sliding surface 7
divided into many fan shapes, each with a hydraulic pocket) 4a
High-pressure oil is supplied to this hydraulic pocket (4a) from a hydraulic source 5 via a ring pipe 8, divided into equal parts by a flow rate regulating valve 9, through an oil supply pipe 6, and just a large number of hydrostatic bearings are connected. A structure formed by a single bearing shoe is adopted.

However, such hydrostatic bearings have the following drawbacks. In other words, the central portion of the rotating disk 3 is not used, as in the hydrodynamic bearings of FIGS. 1 and 2 described above;
Since a large number of grooves are cut in the sliding surface 7, the total area of the hydraulic pocket 4a, which is effective for supporting loads, is smaller than in the case of side 1 in Figs. 3 and 4 above, and if the supported load is constant, the bearing This increases the outer diameter of the shoe 1 and increases bearing loss.

[Purpose of the invention]

The present invention has been made in view of the above points, and its object is to provide a hydrostatic thrust bearing for a chamber-shaft rotating electric machine that allows the use of the central portion of the rotating disk.

[Summary of the invention]

That is, the present invention provides a plurality of hydraulic pockets on the sliding surface of the bearing and in the central enclosure thereof, and supplies high-pressure oil evenly distributed to these plurality of hydraulic pockets by a flow regulating valve. It is characterized by the fact that it is made to do so.

[Embodiments of the invention]

The present invention will be explained below based on the illustrated embodiments. An embodiment of the present invention is shown in FIGS. 7 and 8. Note that parts that are the same as those in the conventional model are given the same reference numerals, and therefore their explanations will be omitted. In this embodiment, a plurality of hydraulic pockets) 4b are provided on the sliding surface 7 of the bearing shoe 1 and around the center thereof, and the flow is evenly distributed to these plurality of hydraulic pockets) 4b by a flow regulating valve 9. High pressure oil was supplied.

By doing this, it becomes possible to obtain a uniform oil film thickness over the entire circumference of the sliding surface 7, thereby obtaining a hydrostatic thrust bearing for a chamber-shaft rotating electrical machine that makes it possible to utilize the central portion of the rotating disk 3. be able to.

In other words, the hydraulic pocket) 4b is connected to the bearing shoe 1 as before.
The hydraulic pocket, which should originally be one, is divided into many parts, and when the rotating disk 3 is normally floating, they are connected to each other and form one hydraulic pocket. This part supports most of the force load. Each hydraulic pocket) 4b has a hydraulic power source 5.
High-pressure oil with an even flow rate is supplied from the oil supply pipe 6 through the ring pipe 8 and the flow rate adjustment valve 9. By doing this, an equal flow rate of high-pressure oil is distributed to each hydraulic pocket 4b in the central part of the sliding surface 7 of the υ bearing shoe 1, so that the flow rate flowing out from each hydraulic pocket 4b to the outer circumferential side is also reduced. As a result, the thickness of the oil film formed on the sliding surface 7 can be made almost uniform, and even if a hydrostatic bearing is used as a large bearing, performance degradation due to unevenness of the oil film thickness can be prevented. be able to.

〔Effect of the invention〕

As described above, the present invention provides a plurality of hydraulic pockets around the center of the sliding surface of the bearing shoe and supplies leaked high-pressure oil evenly distributed to these pockets. In order to ensure that the flow flowing out to the side is almost uniform and that an even oil film is obtained all around the sliding surface, we have installed a hydrostatic thrust bearing for the chamber-shaft rotating electric machine that allows the use of the central part of the rotating disk. Obtainable.

[Brief explanation of drawings]

Figure 1 is a longitudinal cross-sectional side view of a conventional dynamic pressure thrust bearing for a vertical 1iqi+ rotating electrical machine. Figure 2 is a plan view of a hydrodynamic thrust bearing of a conventional military aircraft with a rotating shaft, Figure 3 is a longitudinal cross-sectional side view of a hydrostatic thrust bearing of a conventional chamber shaft rotating electrical machine, and Figure 4 is a side view of a conventional hydrostatic thrust bearing of a conventional chamber shaft rotating electrical machine. A plan view of a hydrostatic thrust bearing, FIG. 5 is a side view, FIG. 6 is a plan view of another example, and FIG. 7 is a vertical cross section of an embodiment of the hydrostatic thrust bearing for a chamber-shaft rotating electric machine of the present invention. The side view and FIG. 8 are also plan views of one embodiment. 1...+i41+receiving shoe, 2 main shaft, 3...rotating disk, 4b"-...hydraulic pocket, 5...hydraulic source,
6... Oil supply pipe, 7... Sliding surface, 9... Flow rate adjustment valve. (1 other person) tth day 2nd day 3rd day 5th day 7th country

Claims (1)

[Claims] A circular bearing shoe that slides on the rotating disc of the 1° support shaft and a hydraulic pocket provided in this bearing shoe are used for the chamber shaft rotating electric machine to which high-pressure oil is supplied. In the hydrostatic thrust bearing, a plurality of the hydraulic pockets are provided on the sliding surface of the bearing shoe and around the center thereof, and the high-pressure oil is evenly distributed to the plurality of hydraulic pockets by a flow rate regulating valve. A hydrostatic thrust bearing for a chamber-shaft rotating electric machine, characterized in that the bearing is configured to supply the following: