JP2504624Y2 - Bearing oil monitoring device - 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 oil monitoring device for monitoring reduction of lubricating oil injected into a bearing box of a rotary electric machine.

[0002]

2. Description of the Related Art FIG. 5 shows a side view of a drip-proof type high-pressure cage three-phase induction motor to which a conventional bearing oil monitoring device is attached. In FIG. 5, a viewing window 2 for confirming the oil level is provided on the right side wall of the oil tank box 1, and a plurality of heat radiation fins 1a are vertically provided on the outer side wall of the oil tank 1 in the axial direction. .

FIG. 6 is an enlarged partial vertical sectional view of a side wall of the oil tank 1 to which the viewing window 2 of the oil tank 1 of FIG. 5 is attached, and FIG. 7 is a left side view of FIG. 6 and 7, a circular hole 1b is provided on the side wall of the oil tank 1, and an annular packing 17 is inserted into the hole 1b, and the inner periphery of the packing 17 is
A disk-shaped glass viewing window 2 and an annular holding member 11 having a substantially U-shaped vertical cross section are inserted from the inside of the oil tank 1.

In the bearing oil monitoring device thus constructed, the oil level of the lubricating oil 13 inside the oil tank 1 can be visually observed from the outside through the viewing window 2.

By the way, the lubricating oil 13 injected into the oil tank 1 is the lubricating oil when the rotating electric machine is operated for a long period of time.
The oil surface of 13 may oxidize and become cloudy.

[0006]

However, in the bearing oil monitoring device having such a structure, the oxidized lubricating oil adheres to the inner surface of the viewing window 2, and when viewed from the outside, it is as if
Even if the lubricating oil 13 inside the oil tank 1 is seen and the oil level of the oil tank 1 is lowered for some reason, the maintenance personnel may misunderstand. Then, even if the oil level of the lubricating oil 13 inside the oil tank 1 is abnormally lowered, it is not known, and there is a possibility that the rotary shaft of the rotating electric machine may be damaged.

Therefore, an object of the present invention is to make it possible to surely see the reduced state of the lubricating oil without misidentifying it as the lubricating oil even if the lubricating oil in the oil tank becomes dirty and adheres to the inner surface of the sight glass. To obtain a bearing oil monitoring device capable of preventing damage to the rotating shaft.

[0008]

SUMMARY OF THE INVENTION The present invention provides a viewing window provided on a side wall of an oil tank of a bearing of a rotary electric machine, a float provided in the oil tank, a permanent magnet fixed to the float, and a viewing window. An indicator provided inside the window so as to be movable up and down, magnetized by a permanent magnet and moved up and down together with the permanent magnet, and a switch fixed between the indicator and the permanent magnet to operate in response to the magnetic force of the permanent magnet, By configuring the bearing oil monitoring device with the display panel that receives the output signal of this switch and displays the oil level of the lubricating oil in the oil tank, even if the oxidized lubricating oil adheres to the sight glass, the oil level You can definitely see the height of
This is a bearing oil monitoring device that prevents damage to the rotating shaft by notifying maintenance personnel on the display panel of the decrease in lubricating oil.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the bearing oil monitoring device of the present invention will be described below with reference to the drawings. 1 is a longitudinal sectional view showing a main part of a bearing oil monitoring device of the present invention, which corresponds to FIG. 6, and FIG.
3 is an enlarged detailed view of the peep chamber of FIG. 1, and FIG. 3 is a left side view of FIG.

1 and 2, in the center of the inner circumference of the holding plate 11 inserted into the inner circumference of the packing 17 together with the viewing window 2.
A strip-shaped indicator guide plate 10 is provided vertically, and the indicator 3 made of a ferromagnetic material is previously inserted and fixed to the lower part of the indicator guide plate 10. In addition, as shown in FIG. 3, a display plate 9 made of a glass plate in which the central portion is colored light blue, the upper portion is colored light orange, and the lower portion is colored light red is pre-inserted on the outside of the indicator guide plate 10. ing.

Furthermore, the inside of the press fitting 11 (the inside of the oil tank 1)
The reed switch 4 at equal intervals above and below the central part.
Are attached, and the lead wires of these reed switches 4
As shown in FIG. 4, 15 is connected to the starting circuit of the starting condition board 8 via the display part of the display board 7 which is separately arranged.

On the other hand, inside the oil tank 1, a substantially inverted L-shaped float guide 12 is vertically provided behind the sight window 2, and a disk-shaped float 5 is provided below the float guide 12. A permanent magnet 6 made of a ferromagnetic material and magnetized is provided in a groove having a U-shaped cross section formed on the outer circumference of the float 5
The float guide 12 is attached to the bottom surface of the float 5.
The adjustment nut 14 inserted from the lower end of the is in contact. Further, a wave canceling plate 16 is provided upright inside the float guide 12.

In the bearing oil monitoring device thus constructed, the float 5 is guided by the float guide 12 to move up and down as the oil level of the lubricating oil 13 injected into the oil tank 1 changes. Then, if the float 5 is lowered to the lower end of the viewing window 2 as shown in FIG.
The permanent magnet 6 absorbs the same height as the permanent magnet 6, and the lowest reed switch 4 is actuated, and the signal is input to a separate display panel 7 and start condition panel 8.

Then, on the display panel 7, a red signal lamp attached to a front door (not shown) is turned on, and a maintenance worker is notified by a buzzer (not shown). Therefore, in the bearing oil monitoring device configured as described above, by adjusting the height of the float 5 with the adjusting nut 14, the rotating electric machine can be adjusted in accordance with the characteristics, the operating rate, and the periodic inspection frequency.
Since it is possible to notify the decrease of the lubricating oil 13 with the necessary allowance period left, it is possible to prevent damage to the rotating shaft of the rotating electric machine.

Further, by increasing the number of reed switches 4 and storing the date and time when each reed switch 4 is actuated in the display panel 7 and the start condition panel 8, the point of time when the abnormal decrease of the lubricating oil 13 occurs and the progress thereafter. Since it is possible to know, it is also possible to judge whether or not the vehicle can be operated until the time of regular inspection.

In the above embodiment, the oil tank 1 is described as an example of an oil tank that supports the rotating shaft of a high-pressure cage type three-phase induction motor, but it may be an electric motor other than an induction motor or a bearing of a generator. Also, the invention can be applied to other rotary electric machines in the same manner.

[0017]

As described above, according to the present invention, the viewing window provided on the side wall of the oil tank of the bearing of the rotating electric machine, the float provided on the oil tank, the permanent magnet fixed to the float, and the viewing window. An indicator provided inside to be vertically movable so as to be magnetized by a permanent magnet and move up and down together with the permanent magnet, a switch fixed between the indicator and the permanent magnet and operated in response to the magnetic force of the permanent magnet, and this switch. By configuring the bearing oil monitoring device with the display panel that receives the output signal of the above and displays the height of the oil surface of the lubricating oil in the oil tank, even if the oxidized lubricating oil adheres to the viewing window, it will not be misidentified. In addition to being able to see the oil level reliably, the maintenance personnel can know the state of decrease of the lubricating oil on the display panel, so it is possible to obtain a bearing oil monitoring device that can prevent damage to the rotating shaft. it can.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional view showing an embodiment of a bearing oil monitoring device of the present invention.

FIG. 2 is an enlarged vertical cross-sectional view showing a main part of FIG.

FIG. 3 is a left side view of FIG.

FIG. 4 is a layout view of the bearing oil monitoring device of the present invention.

FIG. 5 is a side view showing a high-pressure cage type three-phase induction motor to which a conventional bearing oil monitoring device is attached.

FIG. 6 is an enlarged view of a partial vertical cross section of FIG.

FIG. 7 is a left side view of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Oil tank, 2 ... Peep window, 3 ... Indicator, 4 ... Reed switch, 5 ... Float, 6 ... Permanent magnet, 7 ... Display board, 8 ... Start condition board, 9 ... Display board, 10 ... Indicator board , 11… Holder, 12… Float guide, 13… Lubricant.

Claims (1)

(57) [Scope of utility model registration request] 1. A peep window provided on a side wall of an oil tank of a bearing of a rotating electric machine, a float provided on the oil tank, a permanent magnet fixed to the float, and vertically movable inside the peep window. An indicator provided which is magnetized by the permanent magnet and moves up and down together with the permanent magnet, a switch fixed between the indicator and the permanent magnet and operated in response to a magnetic force of the permanent magnet, and an output of the switch A bearing oil monitoring device comprising a display panel that receives a signal and displays the height of the oil surface of the lubricating oil in the oil tank.