JPH0264419A - Measuring device for bearing oil level of rotary electric machine - Google Patents

Abstract

PURPOSE:To prevent the pulsation of a lubricating oil flowing into an oil level fluctuation preventing body from a bearing oil tank by providing said oil level fluctuation preventing body with a lubricating oil rectifying means for preventing the pulsation of the lubricating oil flowing-in from the bearing oil tank. CONSTITUTION:A lubricating oil 8 in a bearing oil tank 7 is agitated by the rotation of a rotary electric machine shaft 1, and a part of the lubricating oil 8 flows into an oil level fluctuation preventing body 10 through a porous rectifier plate 12 provided in the upper end of said oil level fluctuation preventing body 10. Therefore the lubricating oil 8 is rectified by the porous rectifier plate 12. Although a part of the lubricating oil 8 in the aforesaid oil level fluctuation preventing body 10 flows into the bearing oil tank 7 from an oil escape port 10b, in this case, the flow thereof is insignificant. Therefore, the lubricating oil 8 flowing in and filling up the oil level fluctuation preventing body 10 is in a state of nonfluidity almost at all, and consequently pulsation of the lubricating oil 8 in the bearing oil tank 7 does not reach the inside of the oil level fluctuation preventing body 10. Accordingly, there is no possibility of occurrence of fluctuation of an oil level in an oil level indicator 9, and thus highly reliable precision in measurement of the oil level is obtained.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a bearing oil level measuring device for a rotating electrical machine that measures the oil level of a bearing oil tank that stores lubricating oil for lubricating the bearing portion of a vertical rotating electrical machine.

[Conventional technology]

FIG. 9 is a sectional view showing a conventional bearing oil level measuring device for a rotating electrical machine, which is described in, for example, Japanese Utility Model Application Publication No. 59-19.4695, and FIG. 10 is an enlarged sectional view taken along the line X-X of FIG. 9. In the figure, 1 is a rotating electrical machine shaft, 2 is a runner fixed to this rotating electrical machine shaft 1, 3 is a guide bearing of the rotating electrical machine shaft 1,
4 is a thrust pad, 5 is a base plate, 6 is an oil guide, 7 is a bearing oil tank for the rotating electric machine shaft 1, 8 is lubricating oil stored in this bearing oil tank 7, and 9 is installed outside the bearing oil tank 7. An oil level gauge for measuring the oil level in the bearing oil tank 7; 9a is an oil inlet of the oil level gauge 9; 10 is attached to the inner wall surface of the bearing oil tank 7 near the oil inlet 9a; Oil level fluctuation prevention body? The oil level fluctuation prevention body 10 forms a hollow cylindrical oil flow passage 11 with the inner wall surface of the bearing oil tank 7.
The upper and lower ends of this oil flow passage If open into the lubricating oil 8. Next, the operation will be explained. The lubricating oil 8 in the bearing oil tank 7 flows into the interior (oil flow passage 11) from the upper and lower opening ends of the oil level fluctuation preventer 10, and flows into the oil level gauge 9 from the oil inlet 9a. The oil level gauge 9 indicates the bearing oil tank 7.
The oil level inside can now be measured. In this state, when the rotary electric machine shaft 1 starts rotating, the lubricating oil 8 in the bearing oil tank 7 is stirred by the runner 2 that rotates together with the rotating electric machine shaft 1. The lubricating oil 8 is in the vicinity of a total of 9 oil inlets 9a.
pressure fluctuation occurs, and the influence of this pressure fluctuation is measured by the oil level gauge 9.
Although the oil level fluctuates greatly due to direct contact with the oil level, this oil level fluctuation is prevented by the oil level fluctuation preventing body 10 provided near the oil inlet 9a.

[Problem to be solved by the invention]

Since the conventional bearing oil level measuring device for a rotating electrical machine is configured as described above, the bearing of the rotating electrical machine shaft 1 and the bearing oil tank 7
etc., the rotation speed of the rotating electric machine shaft 1 and the amount of oil in the bearing oil tank 7 are different, and the bearing oil tank 7 is different in size.
Since the relative conditions such as the positional relationship between the bottom surface of the oil level fluctuation prevention body 10 and the oil level fluctuation prevention body 10 are different, a part of the lubricating oil 8 that is stirred and pulsated by the runner 2 remains in a pulsating state when the oil level fluctuation prevention body 10 is moved. By directly flowing into the oil level gauge 9 through the oil inlet 9a from the lower end opening through the inside (oil flow passage 11), the oil level in the oil level gauge 9 also fluctuates greatly. There was a problem that accurate oil level measurement could not be performed. This invention was made in order to solve the above-mentioned problems, and the present invention was made in order to solve the above-mentioned problems. The purpose of the present invention is to obtain a highly reliable bearing oil level measuring device for a rotating electrical machine that can prevent fluctuations in the core oil level and improve the accuracy of oil level measurement without affecting the oil level of the bearing. .

[Means for Solving the Problems 1] A bearing oil level measuring device for a rotating electrical machine according to claim 1 of the present invention is provided near the oil inlet of the oil level gauge in a bearing oil tank of a rotating electrical machine equipped with an oil level gauge. The hollow oil level fluctuation preventing body, which is disposed in the bearing oil tank and forms an oil flow passage communicating with the core oil inlet, is provided with a lubricating oil rectifying means for preventing pulsation of the lubricating oil flowing from the bearing oil tank. be. The bearing oil level measuring device for a rotating electrical machine according to claim 2 of the present invention is characterized in that the lubricating oil rectifying means is formed by a closing plate that closes a lower end opening of the oil level fluctuation preventing body, which has a hollow cylindrical shape with upper and lower ends open. , and a perforated rectifier plate such as a wire mesh provided at the upper end opening of the oil level fluctuation prevention body. According to a third aspect of the present invention, there is provided a bearing oil level measuring device for a rotary-electric machine, in which the lubricating oil rectifying means is connected to the bearing that closes a lower end opening of the oil level fluctuation prevention body having a hollow cylindrical shape with upper and lower ends open. It consists of the bottom wall of the oil tank. In the bearing oil level measuring device for a rotating electric machine according to claim 4 of the present invention, the lubricating oil rectifying means is provided at a lower end opening edge of the oil level fluctuation preventing body, which has a hollow cylindrical shape with an upper end closed and a lower end open. The bearing oil tank is provided with a horizontal brim-shaped partition baffle plate that forms a gap for an oil flow passage between the bearing oil tank and the bottom wall surface of the bearing oil tank. In the bearing oil level measuring device for a rotating electric machine according to claim 5 of the present invention, the lubricating oil rectifying means is composed of a spongy shield having oil permeability filled inside the oil level fluctuation preventing body. be. [Function] In the bearing oil level measuring device for a rotating electrical machine according to claim 1 of the present invention, the lubricating oil in the bearing oil tank is stirred by the rotation of the rotating electrical machine, and a part of the lubricating oil flows into the oil level fluctuation preventing body. do. At this time, the pulsation of the lubricating oil flowing into the oil level fluctuation preventing body is prevented by the lubricating oil rectifying means. For this reason,
The oil level of the lubricating oil flowing into the oil level gauge does not fluctuate due to the influence of the above pulsation, and the oil level can be measured accurately by the oil level gauge, resulting in highly reliable oil level measurement accuracy. is obtained. In the bearing oil level measuring device for a rotating electric machine according to claim 2 of the present invention, a part of the lubricating oil that is stirred and pulsating by the rotation of the rotating electric machine is passed through a perforated rectifier provided at the upper end opening of the oil level fluctuation prevention body. The lubricating oil is rectified by a plate and flows into the oil level fluctuation prevention body, and the opening at the lower end of the oil level fluctuation prevention body is closed by a closing plate, so that the lubricating oil does not flow from the lower end of the oil level fluctuation prevention body. Therefore, the same effects as in the case of claim 1 are achieved. In the bearing oil level measuring device for a rotating electric machine according to claim 3 of the present invention, the lower end opening of the oil level fluctuation preventer is closed by the bottom wall of the bearing oil tank, and lubricating oil is supplied only from the upper end opening of the oil level fluctuation preventer. When the lubricating oil flows into the oil level fluctuation prevention body and becomes full, there will be no flow, so the oil level on the oil level gauge will be affected by the pulsation phenomenon of the lubricating oil that is stirred and pulsated by the rotation of the rotating electric machine. Therefore, the same effect as in the case of claim 1 is achieved. In the bearing oil level measuring device for a rotating electrical machine according to claim 4 of the present invention, a part of the lubricating oil that is agitated and pulsates due to the rotation of the rotating electrical machine flows into the lower end opening of the oil level fluctuation preventing body of the upper end closed type. At this time, the lubricating oil is rectified by a horizontal brim-shaped partition rectifying plate protruding outward from the lower opening edge,
Since pulsation of the lubricating oil is prevented, the same effects as in the case of claim 1 can be obtained. In the bearing oil level measuring device for a rotating electric machine according to claim 5 of the present invention, the pulse vJ of lubricating oil flowing into the oil level fluctuation prevention body is
By being absorbed by the spongy shield inside the oil level fluctuation prevention body, the same effects as in the case of the first aspect can be achieved.

【Example】

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a sectional view of a bearing oil level measuring device for a rotating electrical machine according to the first embodiment of the present invention, and FIG. 2 is a sectional view taken along the line ■-■ in FIG. Corresponding parts are designated by the same reference numerals and redundant explanation will be omitted. In the figure, reference numeral 10 denotes an oil level fluctuation preventer mounted on the inner wall surface of the bearing oil tank 7 at a position spaced above the bottom wall surface of the bearing oil tank 7, and 10a closes the lower end opening of this oil level fluctuation preventer 10. The closing plate 101) is an oil relief hole provided on the bottom side wall of the oil level fluctuation prevention body 10, and 12 is a lubricating oil rectification means provided at the upper end opening of the oil level fluctuation prevention body 10. The lubricating oil rectifying means 12 of this embodiment consists of a full-mesh perforated rectifying plate stretched over the upper opening of the oil level fluctuation preventer 10 at an inclination angle of about 30°. Note that the lubricating oil rectifying means 12 is not limited to the perforated rectifying plate made of all mesh, but may be any other perforated rectifying plate, such as a rectifying plate having many punched pores. Next, the operation will be explained. The rotation of the rotating electrical machine shaft 1 stirs the lubricating oil 8 in the bearing oil tank 7, and a portion of the lubricating oil flows through the perforated rectifying plate 12 at the upper end of the oil level fluctuation preventing member 10. flow inside. Therefore, the lubricating oil 8 flowing into the oil level fluctuation prevention body 10 is rectified by the perforated rectifier plate 12 . Then, the oil level fluctuation prevention body 1
The lubricating oil 8 that has flowed into the oil level gauge 9 then flows into the oil level gauge 9 through its oil inlet 9a. As a result, the oil level fluctuation prevention body 10 is filled with lubricating oil 8, and the lubricating oil 8 flows into the oil level gauge 9 so that the oil level is the same as the oil level in the bearing oil tank 7. The state will be as follows. In this state, a portion of the lubricating oil 8 in the oil level fluctuation preventer 10 flows into the bearing oil tank 7 through the oil relief hole 10b, but the flow is very small. For this reason, the oil level fluctuation prevention body 10
The lubricating oil 8 in the bearing oil tank 7 is in a state where there is almost no flow, and therefore the lubricating oil 8 in the bearing oil tank 7
The pulsation does not reach inside the oil level fluctuation prevention body 10. Therefore, there is no possibility that the oil level of the oil level gauge 9 will fluctuate due to the pulsation of the lubricating oil 8, and the oil level can be accurately measured by the nuclear oil level gauge 9, resulting in highly reliable oil level measurement accuracy. . FIG. 3 is a sectional view of a bearing oil level measuring device for a rotating electric machine according to a second embodiment of the present invention, and FIG. 4 is a sectional view taken along the line IV-TV in FIG. By closing the open lower end opening of the oil level fluctuation prevention body 10 with the bottom wall surface of the bearing oil tank 7, the bottom wall surface of the bearing oil tank 7 functions as the lubricating oil rectifying means 12. That is, in a state where a part of the lubricating oil 8 in the bearing oil tank 7 flows into the oil level fluctuation prevention body 10 from its upper end opening, the oil level fluctuation prevention body 10
Since the lower end opening of the bearing oil tank 7 is closed by the bottom wall surface (lubricating oil rectifying means 12), the flow of lubricating oil within the oil level fluctuation preventing body 10 is almost eliminated. Therefore, the same effects as in the first embodiment described above are achieved. FIG. 5 is a sectional view of a bearing oil level measuring device for a rotating electrical machine according to a third embodiment of the present invention, and FIG. 6 is a sectional view taken along the line Vl-Vl in FIG. Preventer l
O has a fan-shaped weir 10c that is closed at the upper end and open at the lower end, and a horizontal brim-shaped partition rectifying plate 12 is provided at the edge of the opening at the lower end as a lubricating oil rectifying means. It is provided. This partition baffle plate 12 forms a narrow gap 12a for an oil flow passage with the bottom wall surface of the bearing oil tank 7. Therefore, in the case of the third embodiment, a part of the lubricating oil 8 in the bearing oil tank 7 is absorbed into the narrow gap 12a formed between the partition baffle plate 12 and the bottom wall surface of the bearing oil tank 7.
It flows into the oil level fluctuation prevention body 10 through the lower end opening of the oil level fluctuation prevention body IO. At this time, the lubricating oil 8 is rectified by the partition rectifying plate 12 while flowing through the gap 12a, and the influence of pressure fluctuations is almost eliminated near the oil inlet 9a of the oil level gauge 9, which is different from the previous embodiment. As in the above case, the oil level of the oil level gauge 9 does not fluctuate, and highly reliable and accurate oil level measurement can be performed. FIG. 7 is a sectional view of a bearing oil level measuring device for a rotating electric machine according to a fourth embodiment of the present invention, and FIG. 8 is a sectional view taken along the line ■-■ in FIG. The preventer 10 is composed of a net cover, and has a structure in which a spongy shield 12 is filled as a lubricating oil rectifying means. Therefore, in this fourth embodiment, the pulsation (dynamic pressure) of the lubricating oil 8 that is about to flow into the oil inlet 9a of the oil level gauge 9 through the net cover 10 is absorbed by the shield 12, and the oil Since the introduction port 9a is not affected by pressure fluctuations of the lubricating oil 8, the same effects as in the previous embodiment can be achieved. Note that the net cover 10 may be replaced with any other material having oil-permeable pores.

【Effect of the invention】

As described above, according to the present invention, a hollow oil level fluctuation preventing body is disposed near the oil inlet of the oil level gauge in the bearing oil tank of a rotating electrical machine equipped with an oil level gauge, and the oil level Since the fluctuation preventing body is provided with a lubricating oil rectifying means, the lubricating oil rectifying means can prevent pulsation (dynamic pressure) of the lubricating oil flowing from the bearing oil tank into the oil level fluctuation preventing body. Therefore, the oil level of the oil level gauge is not affected by the positional relationship of the oil inlet of the oil level gauge, the oil level fluctuation prevention body, and the pulsation of the lubricating oil in the bearing oil tank, and the core oil level is maintained. does not vary, so there is an effect that reliable and accurate oil level measurement accuracy can be obtained by the oil level gauge.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a bearing oil level measuring device for a rotating electrical machine according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-U in FIG. 4 is a cross-sectional view of the bearing oil level measuring device of FIG. 3,
FIG. 5 is a sectional view of a bearing oil level measuring device for a rotating electric machine according to the third embodiment, FIG. 6 is a sectional view taken along the VI-VT line in FIG. 5, and FIG.
The figure is a sectional view of a bearing oil level measuring device for a rotating electrical machine according to the fourth embodiment, FIG. 8 is a sectional view taken along the line ■-■ in FIG. 7, and FIG. 9 is a conventional bearing oil level measuring device for a rotating electrical machine. The sectional view, FIG. 10, is a sectional view taken along the line X--X in FIG. 9. In the figure, 1 is a rotary electric machine shaft, 7 is a bearing oil tank, 8 is lubricating oil, 9 is an oil level gauge, 9a is an oil inlet, 10 is an oil level fluctuation prevention body, 10a is a closing plate, 11 is an oil flow passage, 12 is a lubricating oil rectifying means. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Patent applicant Mitsubishi Electric Corporation

Claims (5)

[Claims] (1) An oil level gauge that is installed in the bearing oil tank of a rotating electrical machine and measures the oil level in the bearing oil tank by introducing the lubricating oil in the bearing oil tank, and a In a bearing oil level measuring device for a rotating electric machine comprising a hollow oil level fluctuation preventing body disposed in an oil tank and forming an oil flow passage communicating with the oil inlet, the oil level fluctuation preventing body includes the oil level fluctuation preventing body as described above. A bearing oil level measuring device for a rotating electric machine, characterized in that a lubricating oil rectifying means is provided to prevent pulsation of lubricating oil flowing from a bearing oil tank. (2) The lubricating oil rectifying means is provided in a closing plate that closes the lower end opening of the oil level fluctuation prevention body, which has a hollow cylindrical shape with open upper and lower ends, and at the upper end opening of the oil level fluctuation prevention body. 2. The bearing oil level measuring device for a rotating electric machine according to claim 1, comprising a perforated current plate such as a wire mesh. (3) The bearing for a rotating electric machine according to claim 1, wherein the lubricating oil rectifying means comprises a bottom wall portion of the bearing oil tank that closes a lower end opening of the oil level fluctuation preventer, which has a hollow cylindrical shape with upper and lower ends open. Oil level measuring device. (4) The lubricating oil rectifying means is provided at the lower end opening edge of the oil level fluctuation preventer, which has a hollow cylindrical shape with a closed upper end and an open lower end. 2. The bearing oil level measuring device for a rotating electrical machine according to claim 1, comprising a horizontal brim-like partition rectifying plate that forms a gap for a flow path. (5) The bearing oil level measuring device for a rotating electrical machine according to claim 1, wherein the lubricating oil rectifying means comprises an oil-permeable spongy shield filled inside the oil level fluctuation prevention body.