CN212082473U

CN212082473U - Matrix flowmeter

Info

Publication number: CN212082473U
Application number: CN202021054717.1U
Authority: CN
Inventors: 马世勋
Original assignee: Jinan Shizhong Automation Instrument Co ltd
Current assignee: Jinan Shizhong Automation Instrument Co ltd
Priority date: 2020-06-10
Filing date: 2020-06-10
Publication date: 2020-12-04
Anticipated expiration: 2030-06-10

Abstract

The utility model discloses a matrix flowmeter, which comprises a housin, the place ahead of casing is provided with the rectifier, positive pressure caliber and negative pressure caliber have set gradually along medium flow direction in the casing, the positive pressure caliber including be responsible for and a plurality of and the branch pipe of being responsible for the intercommunication, the tip of every branch pipe all sets up a malleation measuring probe, a plurality of branch pipes are about being responsible for symmetrical formula setting, a plurality of branch pipes are located the coplanar, a plurality of branch pipes place plane and medium flow direction set up perpendicularly, malleation measuring probe's the mouth of getting is relative with medium flow direction and is set up. The flowmeter adopts multipoint measurement of the gas flow velocity in the pipeline, and adopts the grid rectifying device to rectify the disordered fluid in the pipeline, so that the influence of nonuniform flow field caused by rotational flow and turbulent flow in an air duct on measurement can be avoided, and the measurement error is reduced.

Description

Matrix flowmeter

Technical Field

The utility model relates to a flow detection field especially relates to a matrix flowmeter in pipeline.

Background

In the existing industrial metering scheme, all differential pressure type flow meters are measured according to the bernoulli theorem, but the bernoulli theorem has a basic requirement that the measured fluid is an ideal fluid, the gas flow in a measuring pipeline is ideally in a state that the inner wall of the pipeline is very smooth and has a long straight pipe section, otherwise, the gas flow field in the pipeline is not uniform, and turbulence and rotational flow exist, so that the measuring accuracy is influenced. However, the flue of the utility boiler cannot be subjected to such ideal conditions, which results in a great error in the measurement results.

Disclosure of Invention

To the problem, the utility model discloses a matrix flowmeter, this flowmeter adopt the interior gas velocity of flow multiple spot of pipeline to measure to adopt net fairing to rectify disorderly fluid in to the pipeline, can avoid in the wind channel because the inhomogeneous influence brought to the measurement in flow field that whirl, turbulent flow caused, reduce measuring error.

The utility model provides a matrix flowmeter, includes the casing, the place ahead of casing is provided with the rectifier, positive pressure caliber and negative pressure caliber have set gradually along the medium flow direction in the casing, positive pressure caliber is including being responsible for and a plurality of branch pipes with be responsible for the intercommunication, and the tip of every branch pipe all sets up a malleation measuring probe, a plurality of branch pipes are about being responsible for symmetrical formula setting, and a plurality of branch pipes are located the coplanar, and a plurality of branch pipe place planes set up with the medium flow direction is perpendicular, malleation measuring probe's the mouth of getting is relative with the medium flow direction and is set up.

Preferably, the main pipe of the positive pressure measurer and the negative pressure measurer are both positioned at the center of the pipeline.

Preferably, the rectifier is a grid rectifier.

Preferably, a connecting plate is arranged above the shell, a positive pressure-taking pipe and a negative pressure-taking pipe are arranged in the connecting plate, the positive pressure-taking pipe is communicated with the positive pressure measurer, and the negative pressure-taking pipe is communicated with the negative pressure measurer.

Preferably, the positive pressure taking pipe and the negative pressure taking pipe are respectively communicated with a pressure taking valve.

The utility model has the advantages that:

1. high measurement precision and good long-term stability

The multi-point matrix measuring probe is adopted, the pressure taking port of the probe is opposite to the flow direction of the medium, the maximum pressure value obtained by measuring the pressure value by positive pressure is facilitated, the relative static pressure of the negative pressure at the back is small, and therefore large differential pressure is generated, and the large differential pressure can be improved for the medium with low flow speed. The grid rectifying device rectifies turbulent fluid in the pipeline, high-precision flow measurement under the conditions of short straight pipe sections and flow field turbulence is guaranteed, and the measurement precision can reach 0.5 level.

2. The measuring pipe is arranged in an insertion mode, and the wind shielding area of the combined air quantity measuring device can be almost ignored for the whole large air duct, so that the pressure loss of the whole air duct fluid is almost zero, the energy-saving effect is very obvious, the installation is convenient, and the measuring device is particularly suitable for the use occasion of the flow measurement of the low static pressure fluid

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a front view of the present invention;

fig. 2 is a left side view of the present invention;

FIG. 3 is a perspective view of the present invention;

in the figure: 1. the pressure measuring device comprises a positive pressure taking valve 2, a negative pressure taking valve 3, a positive pressure taking pipe 4, a negative pressure taking pipe 5, a connecting plate 6, a rectifier 7, a positive pressure measuring probe 8, a negative pressure measuring probe 9, a connecting support 10 and a shell.

Detailed Description

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

In the description of the present invention, it should be understood that the terms "inside", "outside", "left" and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

The utility model discloses a matrix flowmeter as shown in fig. 1-3, the place ahead of casing 10 is provided with rectifier 6, this rectifier is latticed fairing, positive pressure caliber and negative pressure caliber have set gradually side by side along the fluid flow direction in the casing, positive pressure caliber including being responsible for and branch pipe, be responsible for and branch pipe pass through joint support 9 intercommunication, the tip of every branch pipe all sets up a malleation measuring probe 7, the branch pipe is in the bilateral symmetry formula of being responsible for and arranges, and all branch pipes are located the coplanar, all branch pipes place plane and the perpendicular setting of medium flow direction, malleation measuring probe's orientation is just to the direction that the medium flows promptly. The end of the negative pressure measurer is provided with a negative pressure measuring probe 8, and the length of the negative pressure measurer is shorter than that of the main pipe of the positive pressure measurer, namely, the negative pressure measuring probe is positioned in the central part of the shell.

The casing top is passed through screw nut and 5 detachable connections of connecting plate, runs through in the connecting plate and establishes positive pressure-tapping pipe 3 and negative pressure-tapping pipe 4, and positive pressure-tapping pipe below communicates with the malleation caliber, and positive pressure-tapping pipe top communicates with positive pressure-tapping valve 1, and negative pressure-tapping pipe below communicates with the negative pressure caliber, and negative pressure-tapping pipe top communicates with negative pressure-tapping valve 2.

The matrix flowmeter is based on the measurement principle of a back tube, a measuring device is arranged on a pipeline, a probe is inserted into the pipeline, when airflow flows in the pipeline, the windward side is impacted by the airflow, the kinetic energy of the airflow is converted into pressure energy, so that the pressure in the windward side is higher and is called as positive pressure, the leeward side is not impacted by the airflow, the pressure in the windward side is the static pressure in the windpipe and is called as static pressure, the difference between the positive pressure and the static pressure is called as differential pressure, the size of the differential pressure is related to the wind speed in the pipeline, and the larger the wind speed is, the larger the differential pressure is; the wind speed is small and the differential pressure is small. The device comprises a plurality of measuring probes, each probe comprises a plurality of gas flow velocity sensors with anti-blocking functions, each sensor comprises a measuring rectifying tube, a throttling element coaxially arranged in the measuring rectifying tube and a corresponding pressure tapping hole, and the whole device is equivalent to a speed measuring array for measuring air volume. When a plurality of measuring probes are inserted into the air duct, the average flow speed of each measuring point on the cross section of the air duct can be accurately measured by connecting the full pressure output by the probes with the full pressure and the static pressure in parallel. This means that if the measurement probes are arranged in the air duct as much as possible and the flow velocity sensors are arranged in each measurement probe as much as possible, the influence of the non-uniform flow field caused by the rotational flow and the turbulent flow in the air duct on the measurement can be avoided, and the measurement error can be reduced.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a matrix flowmeter, a serial communication port, which comprises a housin, the place ahead of casing is provided with the rectifier, positive pressure caliber and negative pressure caliber have set gradually along the medium flow direction in the casing, positive pressure caliber including be responsible for and a plurality of and the branch pipe of being responsible for the intercommunication, the tip of every branch pipe all sets up a malleation measuring probe, a plurality of branch pipes are about being responsible for the symmetrical formula setting, and a plurality of branch pipes are located the coplanar, and a plurality of branch pipe place planes set up with the medium flow direction is perpendicular, malleation measuring probe's the mouth of getting is relative with the medium flow direction and is set up.

2. The matrix flow meter of claim 1, wherein said positive pressure gauge main tube and said negative pressure gauge are located at the center of the duct.

3. The matrix flow meter of claim 1, wherein said rectifier is a grid rectifier.

4. The matrix flow meter according to claim 1, wherein a connection plate is disposed above said housing, a positive pressure tube and a negative pressure tube are disposed in said connection plate, said positive pressure tube is in communication with said positive pressure meter, and said negative pressure tube is in communication with said negative pressure meter.

5. The matrix flow meter according to claim 4, wherein said positive pressure take-off tube and said negative pressure take-off tube are respectively connected to a pressure take-off valve.