阅读说明：本技术 一种流量特性能够调节的水表 (Water meter with adjustable flow characteristic ) 是由 乌骏 蒋彥华 凌玲 王天垚 朱海滢 于 2021-08-20 设计创作，主要内容包括：本发明公开了一种流量特性能够调节的水表,属于水表领域,包括支架以及调节片,调节片可拆卸地安装于支架,通过改变调节片的数量改变叶轮旋转腔内水的体积,从而调节水表误差曲线线性度,整体结构简单、调节方便。(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 an impeller rotating cavity is changed by changing the number of the adjusting pieces, so that the linearity of an error curve of the water meter is adjusted, the integral structure is simple, and the adjustment is convenient.)

1. A water meter with adjustable flow characteristics, comprising a support, characterized in that: the water meter with adjustable flow characteristics further comprises an adjusting sheet, wherein the adjusting sheet is detachably mounted on the support to change the volume of water in the impeller rotating cavity, so that the linearity of an error curve of the water meter is adjusted.

2. A water meter with adjustable flow characteristics as set forth in claim 1, wherein: the number of the adjusting sheets is several.

3. A water meter with adjustable flow characteristics as set forth in claim 1, wherein: the support is provided with a plurality of grooves, the adjusting sheet comprises a main body and two mounting ends, the two mounting ends are located at two opposite ends of the main body, and each mounting end is mounted in one groove to enable the adjusting sheet to be detachably mounted on the support.

4. A water meter with adjustable flow characteristics according to claim 3, wherein: the height of the groove is larger than that of the adjusting sheet.

5. A water meter with adjustable flow characteristics according to claim 3, wherein: each of the mounting ends includes a mounting portion inserted into the groove.

6. A water meter with adjustable flow characteristics according to claim 3, wherein: the mounting portion is parallel to the main body and located on a different plane.

7. A water meter with adjustable flow characteristics according to claim 5, wherein: the mounting end further includes an extension portion located between the body and the mounting portion.

8. A water meter with adjustable flow characteristics according to claim 5, wherein: the two installation parts are positioned on the same straight line.

9. A water meter with adjustable flow characteristics according to claim 3, wherein: an installation space is formed between the two grooves, and the adjusting sheet is located in the installation space.

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 is special in structure, the flow is measured through the impeller positioned on the upper portion of the meter shell, water flow only impacts one portion of the impeller, the speed of the whole section is not integrated, and the average flow speed of a pipeline and the recording speed of the water meter are greatly different due to asymmetric speed distribution or radial components, so that the metering precision is affected. Agricultural water meters generally move up and down through an inlet adjusting device, the metering accuracy of the water meter is adjusted by changing the water flow velocity distribution, however, the adjustment is only limited to an integral parallel movement error curve, and once the error curve has the condition of poor linearity, the adjustment is difficult.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a water meter which can adjust the linearity of an 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:

a water meter with adjustable flow characteristics comprises a support and an adjusting sheet, wherein the adjusting sheet is detachably mounted on the support to change the volume of water in a rotating cavity of an impeller, so that the linearity of an error curve of the water meter is adjusted.

Further, the number of the adjusting sheets is several.

Furthermore, the support is provided with a plurality of grooves, the adjusting sheet comprises a main body and two mounting ends, the two mounting ends are located at two opposite ends of the main body, and each mounting end is mounted in one groove to enable the adjusting sheet to be detachably mounted on the support.

Further, the height of the groove is larger than that of the adjusting sheet.

Further, each of the mounting ends includes a mounting portion inserted into the groove.

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 located on the same straight line.

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

Compared with the prior art, the water meter has the advantages that the adjusting pieces of the water meter with adjustable flow characteristics are detachably arranged in the water meter, the volume of water in the impeller rotating cavity is changed by changing the number of the adjusting pieces, the linearity of an error curve of the water meter is adjusted, the whole structure is simple, and the adjustment is convenient.

Drawings

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

FIG. 2 is an enlarged view of the flow characteristic adjustable water meter of FIG. 1 at A;

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

figure 4 is a perspective view of a regulating blade of the water meter of figure 1 with adjustable flow characteristics;

FIG. 5 is a graph of the flow characteristic of the adjustable flow characteristic water meter of FIG. 1 used in a DN80 farm water meter (span ratio 40) reject;

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

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

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present, secured by intervening elements. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly disposed on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are 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 in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" 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 includes a support frame 10 and a plurality of adjusting plates 20.

The support 10 is provided with a plurality of mounting posts 11, and grooves 12 are arranged on the mounting posts 11. The grooves 12 are linear and perpendicular to the horizontal plane. Specifically, a part of the mounting post 11 is U-shaped, two grooves 12 are arranged on the mounting post 11, and the directions of the two grooves 12 are opposite. Part of the mounting post 11 is rectangular, and a groove 12 is arranged on the mounting post 11. A mounting space 13 is formed between the two opposing grooves 12. The height of the groove 12 is the same as that of the mounting space 13, and the height of the groove 12 is greater than that of the adjusting sheet 20, so that a plurality of adjusting sheets 20 can be mounted between the two grooves 12.

Each tab 20 includes a main body 21 and two mounting ends 22. The two mounting ends 22 are located at both ends of the main body 21, respectively. Each mounting end 22 includes an extension 220 and a mounting portion 221. The extension portion 220 extends from the main body 21, and the mounting portion 221 extends from the extension portion 220. The mounting portion 221 is parallel to the main body 21 and located at a different plane. The mounting portions 221 of the two mounting ends 22 are located on the same plane. This design makes the main body 21 of the blade 20 more easily deformable without affecting 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 sheet 20 are mounted in the groove 12, so that the adjusting sheet 20 can be detachably mounted in the bracket 10, the volume of water in the rotating cavity of the impeller is changed by changing the number of the adjusting sheets 20, the linearity of an error curve of the water meter is adjusted, the whole structure is simple, and the adjustment is convenient. Every adjustment sheet 20 height is 5mm, can add 8 layers of adjustment sheets 20 altogether, simple structure, and accommodation is wide, can satisfy different error curve linearity regulation demands. Because the volume of water in the impeller rotating cavity has great influence on the fluid friction resistance moment of the blade and the start flow of the water meter, the water volume is reduced, the start flow is reduced, and the water meter is more sensitive; meanwhile, the fluid friction resistance moment is reduced, so that the rotating speed increase amplitude of the impeller at a small flow point is much larger than that at a large flow point, and the possibility of adjusting the linearity of an error curve is provided. A large amount of test data shows that the error of the small flow point is increased by about 1% in the positive direction compared with the large flow point when each layer of the adjusting sheet 20 is added. The structure is combined with the existing adjusting device, so that not only can the error curve be adjusted in all directions, but also an effective technical means can be provided for researching and developing the agricultural water meter with a high range ratio (R80).

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, variations and modifications can be made without departing from the spirit of the invention, and all equivalent modifications and changes can be made to the above embodiments according to the essential technology of the invention, which falls into the protection scope of the invention.