CN113701842B

CN113701842B - Water meter with adjustable flow characteristics

Info

Publication number: CN113701842B
Application number: CN202110965361.XA
Authority: CN
Inventors: 乌骏; 蒋彥华; 凌玲; 王天垚; 朱海滢
Original assignee: Ningbo Water Meter Group Co Ltd
Current assignee: Ningbo Water Meter Group Co Ltd
Priority date: 2021-08-20
Filing date: 2021-08-20
Publication date: 2023-12-12
Anticipated expiration: 2041-08-20
Also published as: CN113701842A

Abstract

The invention discloses a water meter with adjustable flow characteristics, which belongs to the field of water meters and comprises a bracket and adjusting pieces, wherein the adjusting pieces are detachably arranged on the bracket, and the volume of water in a rotating cavity of an impeller is changed by changing the number of the adjusting pieces, so that the linearity of an error curve of the water meter is adjusted, and the water meter is simple in integral structure and convenient to adjust.

Description

Water meter with adjustable flow characteristics

Technical Field

The invention relates to a water meter, in particular to a water meter with adjustable flow characteristics.

Background

Compared with other water meters, the agricultural water meter has a special structure, the flow is measured through the impeller arranged on the upper part of the meter shell, the water flow only impacts a part of the impeller, the speed of the whole section is not integrated, and the asymmetrical speed distribution or radial component can cause larger difference between the average flow velocity of the pipeline and the recording speed of the water meter, so that the metering precision is influenced. The agricultural water meter generally moves up and down through the inlet adjusting device to change the water flow speed distribution to adjust the metering accuracy of the water meter, but the adjustment is only limited to an integral parallel movement error curve, and once the error curve has poor linearity, the adjustment is difficult.

Disclosure of Invention

In order to overcome the defects of the prior art, one of the purposes of the invention is to provide a water meter which can realize the adjustment of the linearity of the error curve of the water meter by changing the volume of water in a rotating cavity of an impeller.

One of the purposes of the invention is realized by adopting the following technical scheme:

the utility model provides a water gauge that flow characteristic can be adjusted, includes support and regulating plate, regulating plate detachably install in the support is in order to change the volume of impeller rotation intracavity water to adjust water gauge error curve linearity.

Further, the number of the regulating pieces is a plurality of.

Further, the support is provided with a plurality of grooves, the adjusting piece comprises a main body and two mounting ends, the two mounting ends are positioned at two opposite ends of the main body, and each mounting end is mounted in one groove so that the adjusting piece can be detachably mounted in the support.

Further, the height of the groove is larger than the height of the adjusting piece.

Further, each of the mounting ends includes a mounting portion that is inserted into the recess.

Further, the mounting portion is parallel to the main body and located on a different plane.

Further, the mounting end further includes an extension portion located between the body and the mounting portion.

Further, the two mounting portions are positioned on the same straight line.

Further, an installation space is formed between the two grooves, and the adjusting piece is located in the installation space.

Compared with the prior art, the adjusting piece of the water meter with adjustable flow characteristics is detachably arranged in the water meter, the quantity of the adjusting piece is changed, and the volume of water in the impeller rotating cavity is changed, so that the linearity of an error curve of the water meter is adjusted, and the water meter is simple in integral structure and convenient to adjust.

Drawings

FIG. 1 is a perspective view of a water meter with adjustable flow characteristics in accordance with the present invention;

FIG. 2 is an enlarged view of the flow characteristics of FIG. 1 at a water meter A capable of being adjusted;

FIG. 3 is a perspective view of a bracket of the water meter of FIG. 1 with adjustable flow characteristics;

FIG. 4 is a perspective view of a regulator blade of the water meter of FIG. 1 with the flow characteristics being adjustable;

FIG. 5 is a graph of flow characteristics of the adjustable flow characteristics water meter of FIG. 1 used in a defective DN80 agricultural water meter (range ratio 40);

fig. 6 is a graph of flow characteristics of the adjustable flow characteristics meter of fig. 1 used in a model machine of a DN80 agricultural meter (turndown ratio 80).

In the figure: 10. a bracket; 11. a mounting column; 12. a groove; 13. an installation space; 20. a regulating piece; 21. a main body; 22. a mounting end; 220. an extension; 221. and a mounting part.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or be present as another intermediate element through which the element is fixed. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Fig. 1 to 6 show a water meter with adjustable flow characteristics according to the present invention, which comprises a bracket 10 and a plurality of adjusting plates 20.

The bracket 10 is provided with a plurality of mounting posts 11, and grooves 12 are arranged on the mounting posts 11. The grooves 12 are rectilinear and perpendicular to the horizontal plane. Specifically, a part of the mounting posts 11 are U-shaped, two grooves 12 are formed in the mounting posts 11, and the directions of the two grooves 12 are opposite. Part of the mounting posts 11 are rectangular, and a groove 12 is formed in the mounting posts 11. An installation space 13 is formed between the two opposite grooves 12. The height of the grooves 12 is the same as that of the installation space 13, and the height of the grooves 12 is greater than that of the adjusting sheets 20, so that a plurality of adjusting sheets 20 can be installed between the two grooves 12.

Each adjusting piece 20 comprises a main body 21 and two mounting ends 22. The two mounting ends 22 are located at the two ends of the main body 21, respectively. Each mounting end 22 includes an extension 220 and a mounting portion 221. The extension 220 extends from the main body 21, and the mounting portion 221 extends from the extension 220. The mounting portion 221 is parallel to the main body 21 and is located in a different plane. The mounting portions 221 of the two mounting ends 22 are located on the same plane. This design makes the body 21 of the regulator blade 20 more deformable and does not interfere with the mounting of the two mounting ends 22.

When the water meter with adjustable flow characteristics is used, the two mounting parts 221 of the adjusting piece 20 are mounted in the groove 12, so that the adjusting piece 20 can be detachably mounted in the bracket 10, and the volume of water in the impeller rotating cavity is changed by changing the number of the adjusting pieces 20, so that the linearity of an error curve of the water meter is adjusted, and the water meter is simple in integral structure and convenient to adjust. The height of each adjusting piece 20 is 5mm, 8 layers of adjusting pieces 20 can be added altogether, the structure is simple, the adjusting range is wide, and the linearity adjusting requirements of different error curves can be met. The volume of water in the impeller rotating cavity has great influence on the friction resistance moment of the fluid received by the blades and the starting flow of the water meter, so that the water volume is reduced, the starting flow is reduced, and the water meter is more sensitive; meanwhile, the friction resistance moment of the fluid is reduced, so that the rotating speed of the impeller at a small flow point is greatly increased compared with that at a large flow point, and the possibility is provided for the linearity adjustment of an error curve. As shown by a large amount of experimental data, the error of the small flow point increases by about 1% in the forward direction compared to the large flow point for each additional layer of tabs 20. The combined application of the structure and the existing adjusting device not only can realize the omnibearing adjustment of an error curve, but also can provide an effective technical means for developing the agricultural water meter with high range ratio (R80).

The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, it is possible to make several modifications and improvements without departing from the concept of the present invention, which are equivalent to the above embodiments according to the essential technology of the present invention, and these are all included in the protection scope of the present invention.

Claims

1. The utility model provides a water gauge that flow characteristic can be adjusted, includes support, its characterized in that: the water meter with adjustable flow characteristics further comprises an adjusting piece which is detachably arranged on the bracket so as to change the volume of water in the impeller rotating cavity, thereby adjusting the linearity of the error curve of the water meter; the bracket is provided with a plurality of mounting columns, the mounting columns are provided with grooves which are in a straight line shape and are vertical to a horizontal plane, part of the mounting columns are U-shaped, two grooves are arranged on the mounting columns, the two grooves are opposite in direction, part of the mounting columns are rectangular, a groove is arranged on the mounting columns, a mounting space is formed between the two opposite grooves, the height of the groove is the same as that of the mounting space, and the height of the groove is larger than that of the regulating piece, so that a plurality of regulating pieces can be mounted between the two grooves; each adjusting piece comprises a main body and two mounting ends, the two mounting ends are respectively located at the two ends of the main body, each mounting end comprises an extension part and a mounting part, the extension parts extend out of the main body, the mounting parts extend out of the extension parts, the mounting parts are parallel to the main body and located on different planes, and the mounting parts of the two mounting ends are located on the same plane.

2. The adjustable flow rate characteristic water meter of claim 1, wherein: the mounting portion is inserted into the groove.