JPS5850281Y2 - Mounting structure of bearing vibration meter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mounting structure for a vibration meter that measures shaft vibration of a rotating electric machine or the like.

Measurements of shaft vibration are made by a vibrometer mounted through the bearing.

In this case, it is desirable to be able to measure the vibration by installing the vibration meter in only one location.In particular, considering that shaft vibration is greatest in the vertical direction, it is desirable to install the vibration meter directly above the bearing.

However, in general, in order to prevent the bearing from rotating, a locking pin is installed directly above the bearing between the bracket that supports the bearing and the bearing, so it is not possible to install a vibration meter here. Ta.

This is because the bracket has a structure in which it is divided into upper and lower halves, so if the detent pin is placed diagonally to the side other than directly above, the upper bracket cannot be placed over the bearing.

Conventionally, as shown in Fig. 1, the anti-rotation pin 1 is mounted directly above the bearing (metal) 2 and the bracket 3, and the two vibration meters 4, 4 are placed facing each other at right angles. I had no choice but to install it diagonally to the side.

If two vibration meters 4 are installed in this way, it is possible to detect shaft vibrations in the vertical direction, but since the vibrations are measured at two locations, it takes time and effort, and it is necessary to remove the upper part of the bracket 3. A new problem has arisen in that the vibration meter 4, which is installed diagonally, gets in the way and must be removed in advance.

In FIG. 1, 5 is a shaft, and 6 is a through hole drilled in the metal 2.

The present invention provides a mounting structure for a vibration meter for bearings that eliminates the above-mentioned problems of the conventional technology, and allows the vibration meter to be mounted from directly above the bearing by making the vibration meter mounting structure also function as a detent pin. This made it possible.

The present invention will be described in detail below with reference to FIGS. 2 to 4.

Note that FIG. 2 is a cross-sectional view of the embodiment, with the upper half cut away along the axis, and FIG. 3 is a cross-sectional view of the same embodiment, with the upper half cut away at right angles to the axis.

As shown in FIGS. 2 and 3, the bearing section is constructed by fitting an outer ring 7 to the outer periphery of the metal 2 with an insulating plate 14 interposed therebetween, and further supporting this outer ring 7 slidably with a bracket 3. An outer cylinder 8 is provided passing through the bracket 3 and the position directly above the outer ring 7, and the tip of the outer cylinder 8 is inserted into the through hole 6 of the metal 2.

The vibration meter 4 is fixed to the tip of this outer cylinder 8 by screw fitting, and the tip of the vibration meter 4 is held with a slight gap to the shaft 5.

This gap adjustment is performed using a fixing fitting 9 and a nut 10 that fix the outer cylinder 8 at the upper part of the bracket 3.

That is, a male thread 11 is cut in the middle of the outer cylinder 8, and this male thread 1 is
By screwing the nut 10 into the bracket 1 and rotatably holding the nut 10 with the fixing fitting 9, the outer cylinder 8 is fixed to the bracket 3, and the position of the nut 10 is changed to fix the outer cylinder 8.
The gap of the vibration meter 4 is adjusted by moving the entire device up and down.

A lead wire 12 from the vibration meter 4 is connected to the inside of the outer cylinder 8 and the outer cylinder 8.
It is led out through a coupling fitting 13 screwed onto the upper end of the .

In addition, in FIGS. 2 and 3, 15 is a backing attached to the outer periphery of the outer cylinder 8, 16 is a labyrinth provided on the inside and outside of the metal 2, and 17 is a lid.

As mentioned above, the outer cylinder 8 passes through the outer ring 7, and the through hole for this purpose is a long hole 18 such as an elliptical or rectangular hole on the outer peripheral side of the outer ring 7, as shown in Figs. Moreover, the inner peripheral side has a round hole 19 communicating with the elongated hole 18.

In this case, as shown in FIG. 4, the elongated hole 18 of the outer ring 7 has a long axis in the axial direction and a short axis in the circumferential direction. The dimensions are such that it fits tightly to the outer periphery without any looseness.

On the other hand, the round hole 19 and the through hole 6 of the metal 2 are larger than the outer diameter of the outer cylinder 8.

As a result, the outer cylinder 8 is fixed to the bracket 3 and is in contact with the short diameter of the elongated hole 18 of the outer ring 7, so that the outer ring I and the metal 2 integrated therewith rotate together with the shaft 5. This means that rotation is naturally prevented without the need for a special pin 1 as in the conventional case.

Moreover, since the vibration meter 4 is attached to the tip of the outer cylinder 8, the vibration meter 4
The mounting position is directly above metal 2.

Therefore, the bracket 3 can be removed without removing the vibration meter 4.

Further, since the elongated hole 18 of the outer ring 7 is long in the axial direction, and the round hole 19 of the outer ring T and the through hole 6 of the metal 2 have a larger diameter than the outer cylinder 8, the outer ring 7 is attached to the bracket 3. Even if it slides in the direction of arrow A in FIG. 2, the outer cylinder 8 will be free with respect to the outer ring 7 and the metal 2 as far as the axial direction is concerned, and will not collide.

That is, although the illustrated outer ring 7 has an arcuate surface on its outer periphery and has a bearing structure capable of spherically sliding on the bracket 3, the presence of the outer cylinder 8 does not hinder this function in any way.

Note that even if the outer circumference of the outer ring 7 is flat and can slide in the thrust direction (axial direction), the outer cylinder 8 will not collide with the metal 2 or the outer ring T.

Furthermore, the effect of the elongated hole 18 in the outer ring 7 is that even if oil comes up from the shaft 5 through the through hole 6 of the metal 2, the oil will be pooled in the elongated hole 18 and will not leak to the outside. There is no.

As specifically explained above in conjunction with the embodiments, according to the mounting structure of the present invention, the vibration meter is mounted directly above the bearing, and also serves to prevent rotation of the bearing, so the structure is simple.

In addition, since the vibration meter is installed directly above the bearing, it only needs to be installed in one location, and there is no need to remove the vibration meter when attaching or detaching the bracket, which saves time and effort.

[Brief explanation of drawings]

Figure 1 is a sectional view showing the mounting structure of a conventional vibration meter, Figure 2-
Figure 4 relates to the present invention, Figure 2 is a cross-sectional view of the embodiment with the upper half broken along the axis, Figure 3 is a cross-sectional view of the same example with a part broken at right angles to the axis, and Figure 4. FIG. 2 is an explanatory diagram including a partial cross section of a through hole portion in the outer ring. In the drawing, 2 is metal, 3 is bracket, 4 is vibration meter, 5
is the shaft, 6 is the metal through hole, 7 is the outer ring, 8 is the outer cylinder,
9 is a fixing metal fitting, 10 is a nut, 11 is a male screw, 12 is a vibration meter lead wire, 13 is a coupling metal fitting, 14 is an insulating plate, 15
16 is a backing, 16 is a labyrinth, 17 is a lid, and 18 and 19 are long holes and round holes forming through holes of the outer ring.

Claims (1)

[Scope of utility model registration request] A metal, an outer ring attached to the outer periphery of the metal,
In a bearing section consisting of a bracket that supports this outer ring, an outer cylinder having a vibration meter attached to its tip is fixed to the bracket, and passes through the bracket and the outer ring into a through hole provided in the metal. The through hole of the outer ring through which the outer cylinder penetrates is formed as a long hole that contacts the outer cylinder in the circumferential direction on the outer periphery of the outer ring and is spaced from the outer cylinder in the axial direction. The mounting structure for a vibration meter for a bearing is further characterized in that the metal through-hole is formed to have a diameter that is spaced from the outer cylinder at least in the axial direction.