Ultrasonic flow channel rectifying device

Abstract

The ultrasonic flow channel rectifying device comprises a rectifying section, a measuring section and a contraction section which are sequentially arranged, the rectifying section comprises an air inlet pipe, an expansion pipe, a straight pipe and a beam pipe which are sequentially arranged, the hole diameter of the expansion pipe and the hole diameter of the beam pipe are gradually increased from one end to the other end, and the smaller end of the expansion pipe is communicated with the air inlet pipe. The larger end of the beam pipe is communicated with the straight pipe, and the smaller end of the beam pipe is communicated with the measuring section. Compared with the prior art, fluid can be expanded when passing through the expansion pipe, the speed of the fluid is reduced, the straight pipe rectifies the fluid with the speed reduced, the rectified fluid can accelerate to be rectified again when passing through the beam pipe, and the structural design can effectively improve the uniformity and stability of a flow field. In addition, subsequent measurement is not affected when fluid rectification is completed in the rectification section. And thirdly, compared with thin-wall small pipes filled with different shapes such as a round shape, a square shape, a honeycomb shape and the like, the structure is simpler.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline flow measurement technical field especially is related to an ultrasonic flow channel rectifier. BACKGROUND

[0002] The time difference type ultrasonic flow meter indirectly calculates pipeline flow by measuring the propagation time of ultrasonic signals in the forward and reverse flow, wherein the number and topology structure of sound channels (ultrasonic signal propagation path) are directly related to the average flow velocity of the fluid in the sound channel area, and further affect the accuracy and stability of the flow measurement result. The classical time difference type ultrasonic flow meter sound channel topology structure includes U type, Z type, V type, etc. The sound channel topology structure is relatively simple, but the sound channel coverage (the degree of sound channel coverage of the flow field) is low, which limits the adaptability of the flow meter to the disturbance change of the flow field, and directly affects the accuracy of the flow measurement.

[0003] From the measurement principle, it can be known that the time difference method ultrasonic flow meter measures the linear flow velocity. The linear flow velocity of the fluid is calculated by measuring the time difference of the forward and reverse propagation of ultrasonic waves in the fluid, and then the flow is obtained. When the flow field is uneven and unstable, the cross-sectional average flow velocity obtained by the linear flow velocity according to the model is not accurate, which further leads to errors in the flow.

[0004] Therefore, effectively straightening the fluid upstream or at the measurement position of the ultrasonic flow meter has become a common method to improve its measurement accuracy, and the existing straightening positions and straightening methods are different. There are mainly two kinds. One is to install a section of the same diameter straightening pipe segment at the front end of the flow meter measurement section, and install circular, square, honeycomb and other different shaped thin-walled small pipes in it. These thin-walled small pipes are closely arranged together to fill the entire pipe section to achieve the effect of straightening. The second is to divide the measurement section with multiple metal sheets, and let the fluid flow between the sheets to achieve the purpose of straightening. The existing straightening methods have the problems of complex structure or inconvenient measurement. UTILITY MODEL CONTENTS

[0005] The utility model provides an ultrasonic flow channel rectifier to solve the problem of complex structure or inconvenient measurement of the existing straightening method.

[0006] The utility model provides an ultrasonic flow channel rectifier, which comprises a straightening section, a measurement section and a contraction section arranged in sequence, the straightening section comprises a gas inlet pipe, an expansion pipe, a straight pipe and a beam pipe arranged in sequence, the hole diameters of the expansion pipe and the beam pipe gradually increase from one end to the other end, the smaller end of the expansion pipe is communicated with the gas inlet pipe, the larger end of the beam pipe is communicated with the straight pipe, and the smaller end of the beam pipe is communicated with the measurement section.

[0007] Preferably, the measurement section comprises a square pipe communicated with the beam pipe, an installation pipe is arranged on the square pipe in an inclined manner, an ultrasonic sensor is arranged in the installation pipe, and the square pipe is communicated with the contraction section.

[0008] Preferably, the converging section comprises a converging pipe and an outlet pipe, the aperture of the converging pipe gradually decreases from one end to the other end of the square pipe, and the smaller end of the converging pipe is communicated with the outlet pipe.

[0009] Preferably, the beam pipe is provided with a first fixing plate, the square pipe is provided with a second fixing plate matched with the first fixing plate, and the first fixing plate and the second fixing plate are fixed by bolts.

[0010] Preferably, the second fixing plate is arranged at two ends of the square pipe respectively, the converging pipe is provided with a third fixing plate matched with the second fixing plate, and the second fixing plate and the third fixing plate are fixed by bolts.

[0011] Preferably, the cross section of the straight pipe is rectangular.

[0012] Preferably, the cross sections of the expanding pipe, the beam pipe and the converging pipe are all rectangular.

[0013] Preferably, the length of the square pipe is greater than the lengths of the rectifying section and the converging section respectively.

[0014] Preferably, the square pipe and the mounting pipe are both made of transparent material.

[0015] Preferably, the included angle between the mounting pipe and the square pipe is 45°.

[0016] Compared with the prior art, the fluid entering the inlet pipe is expanded when passing through the expanding pipe, the fluid speed is reduced, the straight pipe rectifies the fluid with reduced speed, the fluid is accelerated and rectified again when passing through the beam pipe, and the structural design can effectively improve the uniformity and stability of the flow field. Secondly, the fluid rectification in the rectifying section does not affect the subsequent measurement. Thirdly, compared with the pipe filled with thin-walled small pipes with different shapes such as circular, square and honeycomb, the structure is simpler. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 It is a structural schematic view of the utility model;

[0019] Figure 2 It is a structural schematic view of the rectifying section of the utility model;

[0020] Figure 3 is a structure diagram of the measuring section of the utility model;

[0021] Figure 4 is a structure diagram of the contraction section of the utility model;

[0022] Figure 5 is a practical diagram of the utility model.

[0023] Reference signs:

[0024] 1. rectification section, 2. measuring section, 3. contraction section, 11. inlet pipe, 12. expansion pipe, 13. straight pipe, 14. beam pipe, 15. first fixed plate, 21. square pipe, 22. mounting pipe, 23. second fixed plate, 31. contraction pipe, 32. outlet pipe, 33. third fixed plate. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the utility model more clear, the technical scheme in the utility model will be described clearly and completely below in combination with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0026] Referring to the drawings, Figure 1 the embodiment provides an ultrasonic flow channel rectification device, which comprises rectification section 1, measuring section 2 and contraction section 3 arranged in sequence, rectification section 1 comprises inlet pipe 11, expansion pipe 12, straight pipe 13 and beam pipe 14 arranged in sequence, the aperture of straight pipe 13 is unchanged, the apertures of expansion pipe 12 and beam pipe 14 gradually increase from one end to the other end, the smaller end of expansion pipe 12 is communicated with inlet pipe 11, the larger end of beam pipe 14 is communicated with straight pipe 13, and the smaller end of beam pipe 14 is communicated with measuring section 2. In the utility model, the fluid coming in from inlet pipe 11 will be expanded when passing through expansion pipe 12, and the fluid speed is reduced, straight pipe 13 rectifies the fluid with reduced speed, after rectification, the fluid will be accelerated to be rectified again when passing through beam pipe 14, and finally the rectified fluid will flow into measuring section 2 and contraction section 3 in sequence. In the structure design of rectification section 1, the diameter-reducing beam is a very classic rectification mode in fluid mechanics. Before the beam, the expansion and speed reduction and the stable flow through a certain straight pipe will further optimize the rectification effect. The rectification mode will not affect the subsequent measurement, and compared with the thin-walled small pipe filled with different shapes such as circular, square and honeycomb in the pipe, the structure is simpler.

[0027] One embodiment of measuring section 2: referring to the drawings, Figure 3The measuring section 2 comprises a square tube 21 communicated with the beam tube 14, and a mounting tube 22 is arranged on the square tube 21 in an inclined manner, and an ultrasonic sensor is mounted in the mounting tube 22, and the square tube 21 is communicated with the converging section 3.

[0028] One embodiment of the converging section 3: Figure 4 The converging section 3 comprises a converging tube 31 and an outlet tube 32, and the aperture of the converging tube 31 gradually decreases from one end close to the square tube 21 to the other end, and the smaller end of the converging tube 31 is communicated with the outlet tube 32.

[0029] One embodiment of the fixing of the rectifying section 1 and the measuring section 2: Figure 2 The first fixing plate 15 is arranged on the beam tube 14, and the second fixing plate 23 is arranged on the square tube 21 in cooperation with the first fixing plate 15, and the first fixing plate 15 and the second fixing plate 23 are fixed by bolts, and the first fixing plate 15 and the second fixing plate 23 are respectively fixed on the outer sides of the beam tube 14 and the square tube 21.

[0030] One embodiment of the fixing of the measuring section 2 and the converging section 3: The second fixing plate 23 is arranged on both ends of the square tube 21 respectively, and the third fixing plate 33 is arranged on the converging tube 31 in cooperation with the second fixing plate 23, and the second fixing plate 23 and the third fixing plate 33 are fixed by bolts, and the third fixing plate 33 is arranged on the outer side of the converging tube 31.

[0031] As another embodiment of the utility model: Gaskets are arranged between the first fixing plate 15 and the second fixing plate 23 and between the second fixing plate 23 and the third fixing plate 33, so as to improve the sealing performance of the rectifying device.

[0032] As another embodiment of the utility model: The cross section of the straight tube 13 is rectangular.

[0033] As another embodiment of the utility model: The cross sections of the expanding tube 12, the beam tube 14 and the converging tube 31 are all rectangular.

[0034] As another embodiment of the utility model: The length of the square tube 21 is greater than the lengths of the rectifying section 1 and the converging section 3 respectively.

[0035] As another embodiment of the utility model: The square tube 21 and the mounting tube 22 are both made of transparent material, so as to facilitate the observation of the fluid in the square tube 21.

[0036] As another embodiment of the utility model: The included angle between the mounting tube 22 and the square tube 21 is 45°.

[0037] As another embodiment of the utility model: rectification section 1, measurement section 2 and contraction section 3 are integrally formed through 3D printing technology respectively.

[0038] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the utility model, but not limited to them; although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it still can modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. An ultrasonic flow channel rectifying device, characterized by, The flow straightening section, the measuring section and the contraction section are sequentially arranged, the flow straightening section comprises a gas inlet pipe, an expansion pipe, a straight pipe and a beam pipe which are sequentially arranged, the diameters of the expansion pipe and the beam pipe gradually increase from one end to the other end, the smaller end of the expansion pipe is communicated with the gas inlet pipe, the larger end of the beam pipe is communicated with the straight pipe, and the smaller end of the beam pipe is communicated with the measuring section.

2. The ultrasonic flow channel rectifying device according to claim 1, characterized by The measuring section comprises a square pipe communicated with the beam pipe, an installation pipe is obliquely arranged on the square pipe, an ultrasonic sensor is arranged in the installation pipe, and the square pipe is communicated with the contraction section.

3. The ultrasonic flow channel rectifying device according to claim 2, characterized in that, The contraction section comprises a contraction pipe and a gas outlet pipe, the diameter of the contraction pipe gradually decreases from one end close to the square pipe to the other end, and the smaller end of the contraction pipe is communicated with the gas outlet pipe.

4. The ultrasonic flow channel rectifying device according to claim 3, characterized in that, A first fixing plate is arranged on the beam pipe, a second fixing plate matched with the first fixing plate is arranged on the square pipe, and the first fixing plate and the second fixing plate are fixed by bolts.

5. The ultrasonic flow channel rectifying device of claim 4, wherein, The second fixing plate is arranged on the two ends of the square pipe respectively, a third fixing plate matched with the second fixing plate is arranged on the contraction pipe, and the second fixing plate and the third fixing plate are fixed by bolts.

6. The ultrasonic flow channel rectifying device of claim 5, wherein, The cross section of the straight pipe is rectangular.

7. The ultrasonic flow channel rectifying device of claim 6, wherein The cross sections of the expansion pipe, the beam pipe and the contraction pipe are rectangular.

8. The ultrasonic flow channel rectifying device of claim 7, wherein, The length of the square pipe is greater than the lengths of the flow straightening section and the contraction section respectively.

9. The ultrasonic flow channel rectifying device of claim 8, wherein, The square pipe and the installation pipe are made of transparent material.

10. The ultrasonic flow channel rectifying device of claim 9, wherein, The included angle between the installation pipe and the square pipe is 45 degrees.

Images