JPS5850269Y2 - water meter rectifier - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a rectifier for a water meter disposed on the tap water inlet side of the impeller.

A water meter has a structure as shown in FIG. 1A, for example.

Reference numeral 1 in the figure indicates the outer case of the water meter, and the tap water that flows in from the inlet (2) flows along the arrow in the figure and flows out from the outlet O.

In the middle of the flow path, an impeller 2 having a rotating shaft 2a with blades extending radially is housed in a cylindrical portion of an impeller storage case 3, and rotates in proportion to the amount of tap water passing through.

The rotational force of the impeller 2 is transmitted to an indicating mechanism (not shown) that displays the water flow rate through a reduction gear train (not shown) that is interlocked with the impeller 2.

In such a water meter, the inlet 1 is bent, so the tap water passing through it becomes a turbulent flow, which interferes with the proportional rotation of the impeller 2, which should rotate in proportion to the flow rate of the water passing through. It means giving.

Therefore, in order to eliminate this turbulent flow of tap water, a rectifier 4 is arranged on the inlet port (2) side of the impeller 2.

Here, the rectifier 4 is placed on the inner step 1a of the outer case 1 by engagement of the projecting edge 4a provided at its lower part with the inner step 1a of the outer case 1, and its upper end has the same diameter as that of the outer case 1. It is joined to the lower end of the inner case 3 having a cylindrical portion.

Furthermore, as clearly shown in FIG. 1B, the rectifier 4 is constructed by integrally forming the bearing 5 of the rotating shaft 2a of the impeller 2 and a plurality of vertical fixed plates 6 positioned radially around the bearing 5. A movable plate 1 for instrumental difference adjustment, which is positioned radially with respect to the bearing 5 in the same way as the vertical fixed plate 6, is attached to the side wall with a slight gap from the bearing 5. ing.

The movable plate 7 for adjusting the instrumental difference can be rotated about an axis passing through the side wall, and can be positioned at a desired angle with respect to the impeller 2.

However, the tap water flowing into the rectifier 4 in a turbulent manner is regulated by the vertical fixed plate 6 and passes through the rectifier 4 along it, but its rectifying effect is still not sufficient, especially for water taps. When the flow rate is small, the vertical fixing plate 6
The tap water itself cannot perform its rectification function, and the tap water flows to the impeller 2 while maintaining a turbulent flow state.

This in turn affects the stability of the water meter's instrument error.

Therefore, the present invention aims to eliminate the above-mentioned drawbacks, and FIG. 2 shows one embodiment thereof.

The same parts as in FIG. 1 are given the same reference numerals.

This water meter in FIG. 2A has substantially the same structure as the water meter shown in FIG. 1A.

Reference numeral 8 in the figure is a filter disposed on the tap water inlet 1 side of the rectifier 4.

As shown in FIG. 2B, this filter 8 is in the form of a disk, with a large number of small holes 8a provided around the periphery.

Of course, this peripheral portion is formed for the convenience of attaching the filter 8, and therefore, only the small holes 8a may be provided over the entire area of the filter 8 as long as there is no problem in attaching the filter 8.

The diameter of this filter 8 is the same as the outer diameter of the rectifier 4, and as shown in FIG. 2C, the lower surface 4b of the rectifier 4
and is fixed to the lower end surface of the bearing 5 by screwing.

In this case, it is desirable that the lower surface 4b of the rectifier 4 is a horizontal surface, but if the lower surface 4b is an inwardly inclined surface, the circumferential surface of the filter 8 should also be inclined accordingly, and the adhesive It may be fixed with an agent or the like.

Therefore, the turbulent tap water flowing into the rectifier first passes through the small holes of the filter to become a trickle and the turbulent state is alleviated, and then it is regulated by the vertical fixed plate in the rectifier, and the impellers follow it. flows to the car.

Therefore, according to the present invention, even if the tap water becomes turbulent due to the influence of the bent inlet, the flow will be rectified by both the filter and the vertical fixed plate, and the turbulent state will definitely be eliminated. Therefore, the instrument error of the water meter is always stable regardless of the magnitude of the water flow rate.

[Brief explanation of the drawing]

FIG. 1A is a partially cutaway front view of a water meter having a conventional rectifier, and FIG. 1B is an enlarged bottom view of the rectifier. FIG. 2A is a partially cutaway front view of a water meter showing an embodiment of the present invention. FIG. 2B is an enlarged bottom view of a filter fixed to the lower surface of the rectifier, and FIG. 2C is a partially cutaway enlarged bottom view of the rectifier to which the filter is fixed. 2... Impeller, ■... Inlet, 4...
... Rectifier, 8... Filter.

Claims (1)

[Scope of utility model registration request] The tap water inlet is bent, an impeller shaft is provided in the direction of the flow of tap water flowing upward from the inlet, tap water is applied to the blade surface of the impeller that extends radially around the impeller shaft, and the blades are removed. In a vertical Waltmann type water meter that measures the flow rate by rotating a wheel in proportion to the flow rate of tap water, a constant amount of tap water is applied to the impeller's blade surface on the tap water inlet side of the impeller. A radial vertical fixed plate is arranged to guide the angle, and a movable plate for instrumental difference adjustment is arranged between the vertical fixed plates so that the angle can be adjusted with respect to the blade part, and the water supply of the movable plate and the vertical fixed plate is arranged. A plate-shaped filter having a large number of small holes of approximately the same diameter is provided on the water inlet side, and a plurality of the small holes are arranged in each room formed by the vertical fixed plate and the movable plate, and the number of the small holes is approximately the same. do,
Water meter rectifier.