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Rectangular flowmeter

A technology of rectangular flowmeter and throttling surface, which is applied in the direction of volume/mass flow generated by mechanical effects, fluid flow detection by measuring pressure difference, etc., which can solve the problem of large jumps in measurement data, failure to achieve measurement results, and poor flow measurement accuracy and other problems, to achieve the effect of improving service life, preventing coking and clogging, and reducing pressure head loss

Pending Publication Date: 2018-03-06
王子平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, practice has proved that only by setting a rectangular throttling piece in the measuring tube to form the Venturi effect is far from being able to achieve accurate measurement results, resulting in poor flow measurement accuracy, narrow measurement range, serious nonlinearity, and large jumps in measurement data, etc. shortcoming

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] figure 1 This is an overall schematic diagram of the rectangular flowmeter in Example 1 of the present application. see figure 1 , this embodiment provides a rectangular flowmeter, including a measuring pipe 100 and a throttle block 200, the top of the throttle block 200 is fastened to the top wall of the measuring pipe 100, and the throttle block 200 is The bottom is a rectangular throttling surface 210 parallel to the downstream axis of the measuring pipe 100 . The throttling block 200 divides the measuring pipe 100 into a straight pipe section 110, a systolic flow section 120, and a throttling section 130 (also referred to as the is the throat), the recovery section 140 and the expansion section 150, a positive pressure taking hole 111 is opened upward at the top wall of the measuring pipe of the straight pipe section 110 for drawing out the positive pressure, and the throttling section 130 A negative pressure taking hole 131 for extracting negative pressure is op...

Embodiment 2

[0078] image 3 It is a schematic perspective view of the overall structure of the rectangular flowmeter according to the second embodiment of the present invention.

[0079] see image 3 , the rectangular flowmeter of this embodiment has a similar structure to the rectangular flowmeter in Embodiment 1, and the difference lies in: image 3 The negative pressure taking hole 131 in the middle is divided into two parts from bottom to top: an oval hole segment 131a and a circular hole segment 131b, wherein the cross section of the circular hole segment is circular, and the cross section of the elliptical hole segment is Oval. The circular hole segment and the oval hole segment are naturally transitionally connected. The direction of the short axis of the ellipse is parallel to the direction of the downstream axis of the measuring pipe 100 .

[0080] The negative pressure taking hole with this structure can not only ensure the pressure transmission area, prevent the solid powde...

Embodiment 3

[0088] Figure 5 It is a schematic diagram of a radial cross-section of a rectangular flowmeter according to Embodiment 3 of the present application. The rectangular flowmeter has a similar structure to the rectangular flowmeter in Embodiment 1. The difference lies in that in this embodiment, the number of negative pressure taking pipes 400 is two. Other numbers, such as three or four, need to be selected. Figure 5 There is an included angle of 90° between the axes of the two negative pressure taking pipes 400, and each negative pressure taking pipe 400 forms an included angle of 45° with the horizontal plane. A plurality of negative pressure taking pipes share one negative pressure taking hole. Corresponding to the number of negative pressure taking pipes, the negative pressure taking hole 131 goes up from the throttle surface 210 to a suitable position, and branches along the axial direction of the negative pressure taking pipe to open a branch 131c that communicates with...

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Abstract

The invention discloses a rectangular flowmeter, and belongs to the field of flow measurement. The rectangular flowmeter comprises a measuring pipeline and a throttling block. The top of the throttling block is connected with the top wall of the measuring pipeline in a fastened mode. The bottom of the throttling block is a rectangular throttling face parallel to the down-flow axial direction of the measuring pipeline, the head end and the tail end of the throttling face extend towards the two ends of the measuring pipeline to the top wall of the measuring pipeline to form a contracted flow face and a recovery face, the throttling block divides the measuring pipeline into a straight pipe section, a contracted flow section, a throttling section, a recovery section and an extension section which are communicated in sequence, a negative pressure obtaining hole for extracting negative pressure is upwards formed in the throttling face of the throttling block, the center position of the negative pressure obtaining hole meets the following relation expressions that 1 / 2Lt<x<Lt, wherein x is the distance between the head end of the throttling face and the center position of the negative pressure obtaining hole, and Lt is the length of the throttling section. According to the rectangular flowmeter, the structure of the rectangular flowmeter is improved, and the measuring accuracy can be improved.

Description

technical field [0001] The application relates to a rectangular flowmeter, which belongs to the technical field of flow measurement. Background technique [0002] The rectangular flowmeter is a throttling device used to generate differential pressure, which makes up for the shortcomings of wedge flowmeters and Venturi flowmeters, and has the advantages of wedge flowmeters and Venturi flowmeters. Rectangular flowmeters can be used to measure gases, vapors and liquids (including oil slurries, high viscosity liquids) as well as high friction (solid particle-containing) fluids and corrosive fluids. [0003] However, in practice, the specific structure of the rectangular throttle (the lower surface of the throttle is rectangular) has a great influence on the measurement results. The position of the center of the positive and negative pressure taking holes, the length of the throttling section, the height of the throttling surface, and the length of the recovery section will all ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/36
CPCG01F1/36
Inventor 王子平王文君
Owner 王子平
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