JPS6221940Y2 - - Google Patents

Description

[Detailed description of the invention] In this invention, tap water flowing into the impeller chamber from a direction parallel to the impeller axis hits the impeller, giving the impeller a rotation corresponding to the flow rate of tap water, and from that rotation This invention relates to an axial impeller type water meter that measures the flow rate of water passing through it.

Conventionally, this type of axial flow impeller type water meter has had a configuration as shown in FIG. 1, for example. In the figure, the reference numeral 1 indicates an impeller storage case whose upper portion is omitted, and the reference numeral 2 indicates a rectifier. The impeller storage case 1 is mounted on a rectifier 2 and supported within a lower case 3, only a portion of which is shown. In the impeller storage case 1, an impeller chamber 4 is formed and partitioned by a cylindrical portion 1a. The blade portion 5a of the impeller 5 is housed in the impeller chamber 4, and the impeller shaft 5b of the impeller 5 is positioned along the center of the cylindrical portion 1a, and rotates around the impeller shaft 5b. support possible. Tap water flowing into the impeller storage case 1 from a direction parallel to the impeller shaft 5b hits the blade portion 5a, causing the impeller 5 to rotate in accordance with the flow rate of the tap water. The rotation of the impeller 5 is transmitted upward by the impeller shaft 5b, and the flow rate of tap water passing through is displayed on an upper display section (not shown). Tap water enters the rectifier 2 from the direction of arrow A,
It is rectified in the rectifier 2 and exits from the outlet passage 1b of the impeller storage case 1. The outlet passage 1b is partitioned by a partition wall 6 and is provided radially around the impeller shaft 5b. Then, an opening is opened in the impeller storage case 1 adjacent to the aforementioned cylindrical portion 1a and parallel to the impeller shaft 5b. On the other hand, the lower end a of the partition wall 6 faces the upper end b of the blade portion 5a of the impeller 5 at a constant interval.

The purpose of this invention is to improve the instrumental error performance in the above-mentioned axial flow impeller type water meter.

Therefore, this invention is characterized in that in the above-mentioned axial flow impeller type water meter, the partition wall between the outlet passages is made to protrude toward the impeller side, except for the central part of the impeller, to form a rectifying rib. shall be.

First, this invention will be specifically explained based on an embodiment of this invention shown in FIG. What is indicated by the reference numeral 11 in FIG. 2 is an impeller storage case, which has a cylindrical portion 11a similar to the conventional axial flow impeller type water meter shown in FIG.
An impeller chamber 14 is formed inside to accommodate the blade portion 15a of the impeller 15. The impeller 15 also has an impeller shaft 15b arranged along the center of the cylindrical portion 11a, similar to the conventional axial flow impeller water meter shown in FIG. and is rotated by tap water flowing into the outlet passage 11b and being discharged from the outlet passage 11b. Similar to the conventional axial flow impeller water meter shown in FIG. An opening is opened in the storage case 11 parallel to the impeller shaft 15b. However, unlike the conventional axial flow impeller type water meter shown in FIG.
is not opposed to the upper end d of the blade portion 15a of the impeller 15 at a constant interval, but a rectifying rib 16a is formed except for the center portion of the impeller 15, and the impeller 1
It is projected to the 5 side by a height h.

FIG. 3 shows another embodiment of this invention. Third
In the embodiment shown in the figure, the lower end e of the partition wall 26 between the outlet passages 21b is made to gradually protrude toward the impeller 25 from the center of the impeller 25 toward the outer periphery.
This forms a rectifying rib 26a. The other configurations are the same as the axial flow impeller type water meter shown in FIGS. 1 and 2.

According to this invention, as mentioned above, the partition wall between the outlet passages is made to protrude toward the impeller side except for the central part of the impeller to form a rectifying rib, so that the tap water that has passed through the impeller is contracted. It will be discharged from the outlet passage without creating a flow (vortex), and the flow rate -
When creating an instrumental error curve, it is possible to improve the instrumental error performance by increasing the flatness of the curve.

In the above embodiment, for convenience of explanation, the configuration other than the partition walls 16 and 26 is the same as that of the conventional axial flow impeller type water meter shown in FIG. 1 to make the features of this invention easier to understand. Therefore, partition wall 1
Just because the configurations other than 6 and 26 are exactly the same does not mean that these configurations are limited to the illustrated embodiment. For example, the impeller chamber may be formed from the impeller storage case and part of the rectifier.
Various modifications can be made, such as forming a stepped portion on the inner wall of the cylindrical portion that partitions the impeller chamber.

[Brief explanation of the drawing]

FIG. 1 is a partial longitudinal sectional view of a conventional axial flow impeller type water meter. FIG. 2 shows an embodiment of this invention, and is a partial vertical sectional view of an axial flow impeller type water meter according to this invention. FIG. 3 shows another embodiment of this invention, and is a partial vertical sectional view of an axial impeller type water meter also according to this invention. 14... Impeller chamber, 15b... Impeller shaft, 15
... Impeller, 11b, 21b ... Exit passage, 1
6, 26... Partition wall, 16a, 26a... Rectifying rib.

Claims (1)

[Scope of utility model claims] A shaft where tap water flowing into the impeller chamber parallel to the impeller shaft hits the impeller and rotates it, and then is discharged from multiple outlet passages provided radially in a direction perpendicular to the impeller shaft. An axial flow impeller type water meter characterized in that a partition wall between the outlet passages projects toward the impeller side except for a central portion of the impeller to form a rectifying rib. .