JPS623690Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a bearing structure for a flowmeter that allows for easy thrust adjustment and replacement of the rotor and bearing while the flowmeter body is installed in a piping line.

Conventionally, the structure of the bearing at the other end of the rotor shaft of the rotor in this type of flowmeter was as shown in Figure 1, which made thrust adjustment and replacement of the rotor and bearing extremely troublesome. Ta.

That is, in order to pull out the rotor 1 along with the rotor shaft 2 from the flow meter body 3 and perform thrust adjustment and replacement, for example, first remove the bolts 4, remove the bearing blind cover 5, and then remove the small bolts 6. , 6, and remove the bearing holding bracket 8 of the ball bearing 7.
must be removed from the rotor shaft 2 before the rotor 1 and rotor shaft 2 can be removed from the flow meter body 3 by the arrow Y.
I couldn't pull it out in any direction.

When adjusting or replacing the thrust of a device such as a flowmeter whose installation location is limited, it is extremely difficult to perform the operations described above while it is installed in the piping line. After removing it from the piping line, the thrust adjustment and replacement of the rotor 1 and bearing were performed.

Therefore, there is a problem in that thrust adjustment and replacement become extremely troublesome and require a long time.

This idea was created by focusing on the above-mentioned problems, and its purpose is to make it possible to freely remove and remove the rotor and bearing part of the flowmeter even if the flowmeter itself is installed in the piping line. The present invention relates to a bearing structure for a flowmeter that allows easy installation, thrust adjustment, and replacement in a short period of time.

This invention will be explained below based on the drawings.

FIGS. 2 and 3 show an embodiment of the bearing structure of a flowmeter according to this invention.

In the figure, reference numeral 8 denotes a cylindrical flow meter body, and a rear cover 9 is attached to the lower opening of the flow meter body 8 with bolts (not shown).

Reference numeral 10 denotes a rotor shaft insertion portion bored in the rear cover 9. A bearing retainer 11 having a bearing locking portion 11a at one end and a flange portion 11b at the other end is fitted into the rotor shaft insertion portion 10. There is. Reference numeral 12 denotes a bearing, such as a cylindrical roller bearing or a needle bearing (the same applies hereinafter), which is fitted into the bearing retainer 11 and is held by the locking portion 11a and the snap spring S. This roller bearing 12 is composed of two members: an outer ring 12A and a plurality of cylindrical rollers 12B fitted to the outer ring 12A, and an annular ring 13 corresponding to an inner ring to be described later can be separated from the cylindrical roller bearing 12. ing.

The cylindrical roller bearing 12 having such a configuration
The rotor shaft 14 of the rotor 14B is inserted into the rotor shaft 14 through the annular ring 13 which is fitted and fixed to the rotor shaft 14, and the outer peripheral surface of the annular ring 13 is connected to the plurality of cylindrical rollers of the cylindrical roller bearing 12. The outer diameter of the annular ring 13 is set so as to come into contact with the outer peripheral surface of the ring 12B. That is, the outer diameter of the annular ring 13 is configured to be within the dimension of the sliding surface of the cylindrical roller bearing 12. In addition, 14
A is a lower thrust adjustment spacer 15 located at the upper part of the annular ring 13 and fitted to the rotor shaft 14;
11A is a blind cover provided on the bearing retainer 11. Reference numeral 11A is a stopper attached to the base end of the rotor shaft 14 with a bolt 15B to prevent the annular ring 13 from coming off.

Next, the operation of this invention will be explained.

According to the bearing structure of the flowmeter of this invention, one end of the rotor shaft 14 of the rotor 14B has an outer ring 12A and a plurality of cylindrical rollers 12 rotatably fitted to the outer ring 12A.
A cylindrical roller bearing 12 consisting of B and the rotor shaft 1
Since the rotor shaft 14 and the rotor 14B are rotatably supported by the annular ring 13 interposed between the base end of the rotor 4 and the cylindrical roller bearing 12, the rotor shaft 14 and the rotor 14B can be moved in the direction of the arrow Y as shown in FIG. The rotor shaft 14 and rotor 14B can be removed from the bearing portion simply by pulling them up.

FIG. 4 shows another embodiment of this invention. In this embodiment, instead of the cylindrical roller bearing 12, a cylindrical carbon bearing 12K is fixed to a bearing retainer 11B that is fitted and fixed to the rotating shaft insertion portion 10 of the rear cover 9. Therefore, the rotor shaft 14 does not require the annular ring 13 and the stopper 15 as in the previous embodiment.

FIG. 5 shows an embodiment of the upper structure of the bearing structure of the flowmeter according to this invention. still,
Components that are the same as those in FIGS. 2 to 4 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

In the figure, 8 is a flowmeter main body, 16 is a front cover attached to the upper opening of this flowmeter main body 8 with bolts 16a, and 17 is a rotor shaft insertion part bored in the front cover 16, and this rotor An upper bearing retainer 18 having a locking portion 18a at one end and a flange portion 18b at the other end is fitted and fixed to the shaft insertion portion 17 with a bolt 18c. A cylindrical carbon bearing 19 is fitted and fixed to the upper bearing holder 18, and its inner diameter is approximately the same as the rotor shaft 14. and,
This rotor shaft 14 has a thrust adjustment spacer 20 such as a disk-shaped collar that is fitted and fixed to the upper part of the rotor shaft 14.
As a result, the rotor 14B is suspended from the upper end surface 19a of the carbon bearing 19, so that a gap between the rotor 14B and the front cover 16 and the rear cover 9 is maintained. On this carbon bearing 19, a disc-shaped carbon bearing 19B,
The spacer 21B is fitted with the upper bearing retainer 18. 22 is a bearing nut fitted onto the rotor shaft 14, and 23 is a magnetic coupling portion attached to the end of the rotor shaft 14. In addition, 25
is a lid provided on the upper bearing presser 18.

In FIG. 5, the thrust adjusting spacer 20 adjusts the thrust, and by rotating the bearing nut 22, the rotor shaft 14 and the carbon bearing 19 are adjusted.
Since the relative position with the thrust adjustment spacer 20 changes, the side gap between the end surface of the rotor 14B and the inner wall of the main body 16 can be adjusted.

As described above, the suspended bearing structure of the rotor shaft 14 can be achieved with an extremely simple configuration, and the upper bearing section can be disassembled and inspected extremely easily, and furthermore, there are advantages such as no dust accumulates in the bearing section.

FIG. 6 shows another embodiment of the upper structure using angular ball bearings.

In the figure, 26, 26 are angular ball bearings fitted to the rotor shaft 14, and are located between the spacer 27 fitted to the upper part of the rotor shaft 14 and the upper thrust adjustment spacer 28. and is held at a desired position on the rotor shaft 14. And this rotor shaft 14
When the outer ring 26a of the angular ball bearing 26 comes into contact with the locking portion 18a of the upper bearing holder 18 that is fitted and fixed in the front cover 16, the flowmeter main body 8
The structure is suspended inside.

In this way, the carbon bearing 19 shown in FIG.
It is also possible to create a suspended bearing structure for the rotor shaft 14 by using an angular ball bearing 26 instead.

As explained above, according to this invention, in the bearing structure of the flowmeter, the rotor is suspended to maintain a side gap with the main body of the flowmeter. This has the effect of reducing the load on the lower bearing, thereby increasing the life of the lower bearing. Furthermore, since the side gap between the rotor and the flowmeter body is adjusted using the upper bearing, the adjustment work is easier, especially in large flowmeters. In addition, the other end of the rotor shaft is pivoted so that it can be freely inserted into and removed from the corresponding bearing part of the flowmeter body, so thrust adjustment and replacement of the rotor and bearing part can be done while the flowmeter is installed in the piping line. It has the effect of being easy to do.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the main part of the bearing structure of a conventional flowmeter, FIGS. 2 and 3 are cross-sectional views of the main part showing an example of the bearing structure of the flowmeter according to the present invention, and FIG. 5 is a cross-sectional view of the main part showing another embodiment of the bearing structure of the flowmeter according to the present invention, FIG. 5 is a cross-sectional view of the main part showing the upper structure of the bearing part of the flowmeter according to the present invention, and FIG. FIG. 7 is a sectional view of a main part showing another embodiment of a bearing structure using an angular ball bearing. 12...Cylindrical roller bearing, 12A...Outer ring, 12
B...Cylindrical roller, 13...Annular ring, 14...
Rotor shaft, 14B...Rotor, 20...Thrust adjustment spacer.

Claims (1)

[Claims for Utility Model Registration] 1. In a bearing structure in which the rotor shaft of the rotor of the flowmeter main body is rotatably supported at both upper and lower ends, a thrust adjustment spacer is provided adjacent to the upper end bearing. , and by providing a bearing nut at the upper end of the rotor shaft, the rotor is suspended by the upper bearing, and the side gap between the rotor and the flowmeter body is adjusted, and at least a part of the lower end bearing is suspended. 1. A bearing structure for a flowmeter, characterized in that a rotor shaft and a part of the lower end bearing can be removably fitted into each other by being fixed to a bearing retainer. 2. The bearing structure of a flowmeter according to claim 1, wherein the lower end bearing is a cylindrical roller bearing. 3. The bearing structure of a flowmeter according to claim 1, wherein the lower end bearing is a cylindrical carbon bearing.