JPS583053Y2 - Water meter impeller support structure - Google Patents

Description

[Detailed description of the invention] This invention is a water meter that measures the passing flow rate from the rotation of an impeller.
For example, the present invention relates to a support structure for an impeller having a structure as shown in FIG.

has.

What is indicated by the reference numeral 1 in the figure is an outer case, which has an inlet 1 and an outlet 0. Water flowing in from the inlet 1 flows in the direction of the arrow in the figure and is discharged from the outlet O.

An impeller 2 is provided in the middle of the flow path and rotates in proportion to the flow rate of water passing through it.

An impeller pinion 3 is provided at the tip of the impeller 2 and transmits the rotation of the impeller 2 to a gear train 4.

The rotation of the impeller 2 is decelerated by a gear train 4, and a pointer 5 coaxial with the constituent gears of the gear train 4 indicates the scale on the dial to display the flow rate.

In such a water meter, the impeller 2 includes, for example, a blade portion 2a and an impeller shaft 2b, and the base of the impeller shaft 2b is screwed into the upper part of the center hole of the blade portion 2a, and is fixed with a nut 6. A cylindrical bushing 7 is fixed to the lower part of the center hole.

The aforementioned impeller pinion 3 is provided at the tip of the impeller shaft 2b, and a stone 8 is press-fitted into the base end of the impeller shaft 2b.

The impeller 2 is placed on a pivot 9 through which the bush 7 is inserted and whose tip contacts the stone 8.

The pivot 9 is screwed onto the lower inner case 10 and fixed with a lock nut 11.

The lower inner case 10 is placed on the inner stage of the outer case 1,
It is held in the middle of the flow path.

The flange portion 10a of the lower inner case 10 is fitted with the flange portion 12a of the upper inner case 12, and is coupled with bolts 13 and nuts 14.

There is an outlet 12b for water that has passed through the impeller 2 at the upper part of the upper inner case 12, and a fixed bearing 15 is screwed into the center of the outlet 12b.

A bushing 16 is fixed to the lower part of the center hole of the fixed bearing 15, and the impeller shaft of the impeller 2 is inserted into the bushing 16.
b is passing through.

Therefore, the impeller 2 is rotatably supported on the pivot 9.

Therefore, in the conventional impeller support structure, the impeller shaft 2b is drawn toward the water outlet 0 side by the flow of water and rotates, so the impeller shaft 2b always comes into contact with the same side of the bushing 16, and the bushing 16 There was a drawback that the durability performance deteriorated due to uneven wear.

That is, to explain based on FIG. 2, since the impeller shaft 2b inside the bushing 16 is pressed against the water outlet 0 side indicated by the arrow and rotates, only the inner surface of the bush 16 on the exit O side is shown by the dotted line in the figure. This results in a one-sided decrease as shown in .

Therefore, the purpose of this invention is to eliminate such drawbacks, and to create an impeller support structure for water meters that has good durability and does not wear out the bushes that support the impeller. .

The impeller support structure for a water meter according to this invention is a water meter that measures the passing flow rate from the rotation of the impeller, in which a pivot is fixed inside the water meter, the impeller is placed on the pivot, and the impeller is mounted on the pivot. A bushing is fixed to the front end side of the axle, and the bushing is brought into contact with a fixed bearing to support the impeller.

Hereinafter, one embodiment of this invention will be described in which the impeller support structure of the water meter shown in FIG. 1 is improved.

FIG. 3 is an enlarged cross-sectional view of the improved fixed bearing section.

The reference numeral 12b' in the figure is an upper inner case similar to that shown in FIG. 1, and the upper inner case 12b'
A screw hole is drilled in the same way as in FIG.

A fixed bearing 15' is screwed into the threaded hole.

The fixed bearing 15' has a flange 15a', and a center hole 15b' is bored in the center.

The fixed bearing 15' has a flange 15 in the screw hole.
It is screwed in to a'.

The impeller shaft 2 is located in the center hole 15b' of the fixed bearing 15'.
The tip side of b' is penetrated.

The impeller shaft 2b' is similar to that in FIG. 1, but
A bushing 16' is fixed to its outer periphery.

The bushing 16' is made of ebonite, for example, and is formed into a cylindrical shape.A pin p is inserted into the impeller shaft 2b' passing through the center of the bushing 16', and the bushing 16' is attached to the impeller shaft 2b'. Fixed.

When the impeller rotates, the bush 16' also rotates, and the outer surface of the bush 16' contacts the inner surface of the center hole 15b', supporting the upper part of the impeller.

Therefore, according to this invention, since the bushing rotates together with the impeller shaft, the outer surface of the bushing will not wear out as a whole and will not wear out on one side, which has the advantage of improving durability.

In the above embodiment, the improved structure of the water meter shown in FIG. 1 has been described, but the impeller support structure according to this invention is not limited to the water meter shown in FIG. This can be applied to all water meters in which a pivot is fixed inside, an impeller is mounted on the pivot, and the passing flow rate is measured from the rotation of the impeller.

Of course, the shape or fixing structure of the pivot is not limited to the structure shown in FIG.

Further, in the example shown in FIG. 3, a cylindrical bushing 16' is fixed to the impeller shaft 2b' using a pin p, but the shape of the bushing is not limited to a cylindrical shape, and pins, etc. Of course, the fixing method is not limited to the one used, and fixing may be performed by, for example, adhesion.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a water meter having a conventional impeller support structure. FIG. 2 is a partial sectional view taken along line II-II. FIG. 3 is an enlarged sectional view of the improved fixed bearing portion, illustrating an embodiment of this invention which is an improved impeller support structure shown in FIG. 1. 2... Impeller, 9... Pivot, 2b
, 2b'... impeller shaft, 16.16'...
... Bush, 15.15' ... Fixed bearing.

Claims (1)

[Scope of utility model registration request] In a water meter that measures the flow rate through the rotation of the impeller, a pivot is fixed inside the water meter, the impeller is placed on the pivot, and a bushing is fixed to the tip of the impeller shaft of the impeller. An impeller support structure for a water meter that supports the impeller by bringing the impeller into contact with a fixed bearing.