JPH0843153A - City water meter - Google Patents

Abstract

PURPOSE:To facilitate mounting and replacement of component,e.g. an impeller, and to facilitate the assembling work of a city water meter by decreasing the number of components. CONSTITUTION:An indication mechanism 30 is set in a meter case 50 extending tubularly from the outer face of a piping and coupled with an impeller 10 being rotated by the water flow passing through the piping. In such city water meter, the impeller 10 is supported, while aligning the rotary axis thereof with the axis of the piping, by a tubular post-flow straightener 20 formed to match the inner circumferential diameter of the piping. The post-flow-straightener is then inserted into a mounting hole made through the flat bottom part of the meter case for mounting the indication mechanism while traversing the piping and set in place. An upper case 40 is fixed to the upper part of the meter case being sealed hermetically inside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water meter, and more particularly to the structure of an impeller, an indicator mechanism, etc. used in the water meter.

[0002]

2. Description of the Related Art FIGS. 7 and 8 show an external view of a conventional water meter. The water meter shown in FIG. 7 is of a type in which an impeller arranged inside the pipe and a rectifier for adjusting the flow of water hitting the impeller are inserted into the pipe from the lateral direction of the pipe. Further, the water meter shown in FIG. 8 is configured such that an impeller or the like can be mounted in the pipe from a meter case provided on the upper part of the pipe. The water meter shown in FIG. 8 has an advantage that when the impeller or parts are replaced after the water meter is installed, the work can be performed with the pipes attached.

[0003]

By the way, the above-mentioned FIG.
As in the water meter shown in Fig. 2, in the water meter in which parts such as the impeller can be replaced while the pipe is still installed, the impeller and the indicator mechanism are pre-assembled and then installed in the pipe. However, there is a problem in that the number of parts becomes complicated and the number of parts increases. In FIG. 8, 5 is the main body of the pipe, 6 is a mounting flange provided on the main body 5, and 7 is a flange.
Is a support flange for the impeller or the like, and 8 is a case part for attaching the built-in indicating mechanism to the flange 7. In this example, the flange 6 and the support flange 7, and the support flange 7 and the case portion 8
And are sealed and connected by an O-ring.

The present invention makes it possible to reduce the number of parts by simplifying the structure of a water meter constructed so that parts such as an impeller can be exchanged from a meter case provided at the top of piping. It is an object of the present invention to provide a water meter that facilitates the assembly work of the meter to reduce the manufacturing cost, facilitates the replacement of parts such as the impeller, and is easy to handle.

[0005]

The present invention has the following constitution in order to achieve the above object. That is, in the water meter, the indicator mechanism is housed in a meter case extending cylindrically from the outer surface of the pipe, and the impeller rotating by the water flow passing through the pipe and the indicator mechanism are provided in a linked manner. After forming a cylindrical body to match the inner diameter of the pipe, the rotation axis of the rectifier is aligned with the central axis of the pipe to rotatably support the impeller, and a flat surface for housing the indicating mechanism. The rear rectifier is inserted from the mounting hole provided at the bottom of the formed meter case so as to cross the pipe and set, and the upper case is attached to the upper part of the meter case by sealing the inside of the meter case in a watertight manner. It is characterized by that. Further, a worm gear is provided on the rotating shaft of the impeller, the worm gear and the worm wheel are meshed with each other, and the shaft of the worm wheel is extended toward the indicating mechanism, and the pinion provided above the shaft and the indicating mechanism are provided. The worm wheel and the shaft of the worm wheel are inserted by inserting a rib that meshes the provided gear to connect the impeller and the instruction mechanism, and is integrally formed with a bearing portion that supports the impeller of the rear rectifier. It is characterized in that it is provided in a possible cylindrical shape, and the outer surface shape of the rib is formed in a streamlined shape in which the rear surface side is a squeezed shape. Further, a guide groove for guiding the rear rectifier and positioning and setting the rear rectifier at a predetermined position is provided on an inner peripheral surface of a pipe on which the rear rectifier is mounted. Further, a screw is provided around the upper outer peripheral surface of the meter case, and a screw which is screwed with the screw is provided around the inner peripheral surface of the upper case, so that the upper case can be screwed to the meter case. The thing is
It is preferable in that the upper case can be easily attached and the water meter can be easily assembled.

[0006]

In the water meter according to the present invention, the rectifier can be installed after the impeller is installed from the meter case side provided on the outer surface of the pipe, and the impeller can be replaced while the water meter is installed in the water pipe. To do. The impeller is mounted on the rear rectifier to be unitized, and is set by inserting it into the pipe through the mounting hole provided on the bottom of the meter case on which the indicator mechanism is mounted. The post-rectifier and the indicator mechanism are connected to each other by setting the post-rectifier in the pipe, placing the indicator mechanism on the post-rectifier, and setting the indicator mechanism in the meter case. When the worm gear and the worm wheel provided on the impeller are connected to each other, the shaft of the worm wheel is extended toward the indicating mechanism, and the pinion provided on the upper part of the shaft is engaged with the gear provided on the indicating mechanism. . The inside of the meter case is watertightly closed by fastening and fixing the upper case on the upper part of the meter case.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a side sectional view showing a configuration of an embodiment of a water meter according to the present invention, and FIG. 2 is a vertical sectional view showing a mounting portion of an impeller. The water meter of this embodiment detects the rotational speed of the impeller 10 and the post-rectifier 20 that rotatably supports the impeller 10 on the central axis of the main body 5 of the pipe and regulates the water flow behind the impeller 10. Indicating mechanism 30 for integrating and displaying the number of rotations, meter case 50 accommodating indicating mechanism 30, and indicating mechanism 30 inside meter case 50
And an upper case 40 that seals and seals in a watertight manner.
1 and 2 show a rear rectifier 20 and an indicating mechanism 3 in a main body 5 of a pipe.
It is a state where 0 is set.

FIG. 3 shows a front view of the rear rectifier 20 as seen from the rear side. The rear rectifier 20 includes a cylindrical body portion 20a and a cylindrical body portion 20a, each of which is formed in a diameter substantially equal to the inner diameter of the main body 5 of the pipe.
Flat plate portion 20b integrally formed with the tubular portion 20a on the upper end surface of the
And a bearing portion 20c for supporting the rotating shaft 10a of the impeller 10 in parallel with the center axis of the main body 5 and supporting the same in parallel with the center axis. The bearing portion 20c is supported integrally with the tubular portion 20a by three-point support of the ribs 21a, 21b, 22. Rib 22
Is formed to have a diameter larger than that of the ribs 21a and 21b, so that the worm wheel that connects the impeller 10 and the indicating mechanism 30 can be inserted into the inside.

As shown in FIG. 1, the impeller 10 includes a rear rectifier 2
It is rotatably supported by the bearing portion 20c of 0. At this time, the impeller 10 is mounted so that the blades do not protrude outside the outer surface of the cylindrical body portion 20a. This is used when the impeller 10 is mounted on the rear rectifier 20 and set in the pipe. This is to enable protection. Although the rotation of the impeller 10 is detected by the instruction mechanism 30, in the embodiment, as shown in FIG. 2, the worm gear 10b is provided on the rotating shaft 10a of the impeller 10, and the worm wheel 24 is meshed with the worm gear 10b to form the shaft 24.
a is extended toward the indicating mechanism 30 and is connected to the indicating mechanism 30. A pinion 26 is provided on the upper end of the shaft 24 a, and the pinion 26 meshes with a gear 28 in the instruction mechanism 30.

As shown in FIG. 2, the worm wheel 24 is arranged at a position slightly offset to the right of the center of the rear rectifier 20. Reference numeral 25 denotes a bearing that supports the lower end of the worm gear 24. The worm gear 24 is rotatably supported by inserting its lower end into the bearing 25. The rib 22 is formed in a cylindrical shape for inserting the worm wheel 24 and the shaft 24a so that the water flow is not disturbed, and the outer surface thereof is formed in a streamline shape.

FIG. 4 shows the rear rectifier 20 as viewed from above the flat plate portion 20b. In the figure, the outer surface shape of the rib 22 is shown by a broken line, but as shown in the figure, the rib 22 is formed in a streamlined shape with the rear surface side squeezed so that the water flow does not disturb. With the design of the ribs 21a, 21b, 22 of the embodiment shown in FIG. 3, the transmittance of the rear rectifier 20 was 59.6%, and good transmittance was obtained.

When the rear rectifier 20 is set in the pipe, the flat plate portion 20b is turned up as shown in FIG.
Set 0a along the inner wall surface of the bottom surface of the pipe. The meter case 50 accommodating the indicating mechanism 30 is formed by extending a short cylindrical shape from the main body 5 of the pipe, and the inner diameter thereof is formed slightly larger than the outer diameter of the cylindrical body portion 20a of the rear rectifier 20. Therefore, the rear rectifier 20 is installed in the meter case 5
It can be set by inserting it into the pipe from above 0.

A guide groove 5a for guiding and setting the cylindrical portion 20a of the rear rectifier 20 to a regular position is provided on the inner wall surface of the main body 5 for setting the rear rectifier 20, and the meter case 50 When the rear rectifier 20 is inserted into the pipe, the outer surface of the tubular portion 20a enters the guide groove 5a, and the front and rear positions of the rear rectifier 20 are accurately positioned and set. In FIG. 1, the lower part of the tubular body portion 20a of the rear rectifier 20 slightly enters the inner wall surface of the main body 5 to indicate that the tubular body portion 20a is set in the guide groove 5a.

Indicator mechanism 30 housed in meter case 50
The basic structure is the same as that of the indicating mechanism 30 used conventionally. The case portion of the indicating mechanism 30 has a flat upper surface and a lower surface and a circular outer peripheral surface. When the indicator mechanism 30 is set in the meter case 50, the indicator mechanism 30 is set in the circumferential direction position with respect to the meter case 50. The position of the indicating mechanism 30 can be adjusted by fitting the projection provided on the outer side surface of the indicating mechanism 30 and the concave groove provided on the inner wall surface of the meter case 50 into the concave and convex portions. As a result, the indicating mechanism 30 can be set so as not to rotate.

FIG. 5 is an explanatory view of the meter case 50 as seen from above. The bottom portion 50a of the meter case 50 is formed into a flat surface for laying the indicating mechanism 30 flat, and the bottom portion 50a is provided with a mounting hole 50b for setting the rear rectifier 20 in the pipe. The mounting hole 50b is formed in a rectangular shape so that the tubular body portion 20a of the rear rectifier 20 can be inserted therein. Since the rear rectifier 20 arranges the flat plate portion 20b in a direction orthogonal to the axial direction of the pipe, that is, with the rotation axis of the impeller 10 aligned with the central axis of the pipe, the mounting hole 50b has the longitudinal direction of the mounting hole 50b. Provide in the direction orthogonal to the direction.

FIG. 6 shows the post-rectifier 20, the indicating mechanism 3 described above.
The assembly drawing which sets 0 and assembles a water meter is shown.
When assembling, first, the rear rectifier 20 is set on the main body 5. Therefore, the impeller 1 is installed in the rear rectifier 20 in advance.
0 is mounted, the flat plate portion 20b is held in the hand, and the cylindrical body portion 20a is inserted into the mounting hole 50b. As shown in FIG. 4, in order to facilitate the detaching operation of the rear rectifier 20,
You may provide the recessed part which hooks a finger in the longitudinal direction both ends of the flat plate part 20b. When the rectifier 20 is detached after being mounted on the main body 5, it is easier to handle the concave portion.

A worm wheel 24 is mounted on the rear rectifier 20. The worm wheel 24 may be mounted on the rear rectifier 20 together with the rear rectifier 20, or the rear rectifier 20 is set on the main body 5. The worm wheel 24 may be attached later. The lower end of the worm wheel 24 is inserted into the bearing 25, and the wheel shaft metal 24 is inserted into the shaft hole 20d formed in the flat plate portion 20b.
Both of these methods are possible because they are mounted by mounting b.

As shown in FIG. 2, the wheel shaft metal 24b is also fitted in a through hole 30a provided in the bottom of the case portion of the indicating mechanism 30 for passing the pinion 26 therethrough. In this way, it can be used for positioning the rear rectifier 20 and the indicating mechanism 30. After mounting the worm wheel 24, the indicator mechanism 30 is inserted into the meter case 50 from above and set as shown in FIG. The indicating mechanism 30 is set in contact with the flat plate portion 20b of the rear rectifying portion 20 as shown in FIG.

Since the rear rectifier 20 is set such that the tubular portion 20a is inserted into the guide groove 5a, the rear rectifier 2 is
0 is slightly rotatable along the guide groove 5a, and the mounting hole 5
When the rear rectifier 20 is inserted and set from 0a, the rear rectifier 20 may be set with a slight inclination from the normal position. As described above, the bottom portion of the indicating mechanism 30 is attached to the flat plate portion 20b.
When the rear rectifier 20 is tilted and set, the flat plate portion 2 is set at the bottom of the indicating mechanism 30.
By pressing 0b, the rear rectifier 20 can be corrected to the normal position.

By setting the indicating mechanism 30, the pinion 26 meshes with the gear 28 as shown in FIG. 1, and the impeller 10 and the indicating mechanism 30 are connected. After inserting the indicator mechanism 30 into the meter case 50, the upper case 40 is screwed to the opening of the meter case 50 to seal the inside of the meter case 50 in a watertight manner. As shown in FIG. 1, a screw is provided around the inner peripheral surface of the mounting portion of the upper case 40 with the meter case 50, and a screw which is screwed onto the peripheral surface is also provided on the upper outer peripheral surface of the meter case 50. It is set up. Reference numeral 42 is a transparent glass plate for visually recognizing the display portion of the indicating mechanism 30, 44 is a flat rubber sheet for sealing disposed between the transparent glass plate 42 and the upper end surface of the meter case 50, and 46 is a transparent glass plate 42. The flat rubber is arranged between the upper case 40 and the upper case 40. The upper case 40 and the meter case 50 can be attached by sealing the inside of the meter case 50 in a watertight manner by tightening and fixing them through the flat rubbers 44 and 46. Reference numeral 48 denotes an opening / closing lid provided on the upper surface of the upper case 40.

In the water meter, a front rectifier 60 is mounted in order to regulate the water flow applied to the impeller 10. The front rectifier 60 is set so as to be inserted into the main body 5 through the lateral opening of the pipe. Thus, as shown in FIGS. 1 and 2, it is possible to obtain a water meter in which the front rectifier 60 and the rear rectifier 20 are mounted in the main body 5. In the water meter of the embodiment, the water flow is adjusted by the front rectifier 60 and the rear rectifier 20,
The impeller 10 set on the rear rectifier 20 has the indicating mechanism 30.
To detect the flow rate.

The water meter of this embodiment is shown in FIG. 8 because the rear rectifier 20 for supporting the impeller 10 and the indicating mechanism 30 can be mounted from the meter case 50 side provided on the upper portion of the pipe. Like the conventional water meter, the impeller 10 and the like can be replaced without removing the pipe. In the water meter of this embodiment, the rear rectifier 2 is used.
By uniting the 0 and the indicating mechanism 30, the work of assembling the water meter, the work of exchanging the impeller 10 and the like can be performed very easily. That is, at the time of assembling the water meter, only the operation of inserting the rear rectifier 20 and the indicating mechanism 30 into the meter case 50 is necessary, and the operation such as screwing is not necessary, so that the water meter can be assembled with almost one touch. become.

Also, when the meter case 50 is sealed and hermetically sealed, the upper case 40 is screwed to the outer peripheral surface of the meter case 50. Therefore, the operation of tightening and mounting the upper case 40 on the meter case 50 is easy. is there. Further, the meter case 50 needs only to have a space for accommodating the indicating mechanism 30, and the upper case 40 is screwed to be attached to the meter case 50. Therefore, the entire water meter can be made compact. There is also an advantage that the meter case 50 does not interfere with bolt tightening when connecting the water meter to the water pipe.

In the above embodiment, the indicator mechanism 30 is attached to the meter case 50, and the impeller 1 is connected to the indicator mechanism 30.
The configuration in which the rectifier 20 is set after mounting 0 can be applied not only to the water meter of the above-described embodiment but also to various types of water meters. For example, as a method of detecting the rotational speed of the impeller 10, the pinion 26 and the gear 28 are meshed and connected in the embodiment, but the impeller 1 is magnetically connected.
It can also be applied to a method of detecting the number of rotations of zero.

[0025]

As described above, according to the water meter of the present invention, the impeller is attached to the rear rectifier to form a unit, and the rear rectifier can be attached from the meter case provided on the outer surface of the pipe. This makes it easy to install and replace the impeller and the like. In addition, since the indicator mechanism is housed and assembled in the meter case, the structure of the water meter can be simplified and the number of parts can be reduced, so that the water meter can be assembled efficiently. It produces a remarkable effect such as enabling.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of a water meter.

FIG. 2 is a vertical sectional view of an embodiment of a water meter.

FIG. 3 is a rear front view of a rear rectifier.

FIG. 4 is a top view of a rear rectifier.

FIG. 5 is a top view of a meter case portion of the water meter.

FIG. 6 is an assembly diagram of a water meter.

FIG. 7 is an external view of a conventional example of a water meter.

FIG. 8 is an external view of a conventional example of a water meter.

[Explanation of symbols]

 5 Main body 5a Guide groove 10 Impeller 10a Rotating shaft 20 Rear rectifier 20a Cylindrical part 20b Flat plate part 20c Bearing part 20d Shaft holes 21a, 21b, 22 Rib 24 Worm wheel 24b Wheel shaft metal 25 Bearing 26 Pinion 28 40 Gear 30 Upper case 50 Meter case 50a Bottom part 50b Mounting hole 60 Front rectifier

Claims (4)

[Claims] 1. A water meter in which an indicator mechanism is housed in a meter case extending in a cylindrical shape from the outer surface of a pipe, and an impeller rotating by a water flow passing through the pipe and the indicator mechanism are connected to each other. In order to accommodate the indicating mechanism while supporting the impeller rotatably by aligning the rotation axis with the central axis of the pipe in the rectifier formed in a cylindrical shape according to the inner peripheral diameter of the pipe. The rear rectifier is inserted and set so as to traverse the pipe through a mounting hole formed on the bottom of the meter case formed on a flat surface, and the inside of the meter case is watertightly sealed on the upper part of the meter case. A water meter with a case attached. 2. A worm gear is provided on the rotary shaft of the impeller,
While engaging the worm gear and the worm wheel, the shaft of the worm wheel is extended toward the indicating mechanism,
A rib that connects a pinion provided on an upper portion of the shaft with a gear provided on the indicating mechanism to connect the impeller and the indicating mechanism, and is integrally formed with a bearing portion that supports the impeller of the rear rectifier. 2. The water supply system according to claim 1, wherein the worm wheel and the shaft of the worm wheel are provided in a cylindrical shape into which the shaft of the worm wheel can be inserted, and the outer surface shape of the rib is formed into a streamline shape in which the rear surface side is a squeezed shape. Meter. 3. A guide groove for guiding the rear rectifier and for positioning and setting the rear rectifier at a predetermined position is provided on an inner peripheral surface of a pipe on which the rear rectifier is mounted. Water meter described. 4. A screw is provided around the upper outer peripheral surface of the meter case, and a screw that engages with the screw is provided around the inner peripheral surface of the upper case, and the upper case is screwed to the meter case. The water meter according to claim 1, which is made possible.