CN206891504U - Micro-bend type shell and tube mass flowmenter - Google Patents

Abstract

The utility model provides a micro-curved tubular mass flowmeter, comprising: a shell; two diversion sleeves connected to the two ends of the shell; The two ends are respectively connected to the diversion sleeve; a pair of bow-shaped flow tubes are arranged in the casing, and the two ends of the flow tube are respectively connected to the diversion sleeve, and the length of the flow tube is equal to the length of the diversion tube; a driving element is fixed on the two A flow tube, the driving element drives a pair of flow tubes to vibrate and is located in the center of the flow tube; and two detection elements, each detection element is respectively fixed on the two flow tubes to detect vibration and is located on both sides of the drive element. The micro-curved tube-type mass flowmeter of the utility model can reduce the diameter of the flow tube used for Coriolis mass flow measurement as much as possible under the condition of constant flow through the arrangement of multiple tubes, thereby reducing the measurement error and improve measurement reliability.

Description

Micro-curved shell and tube mass flowmeter

technical field

The utility model relates to the field of mass flowmeters, in particular to a micro-curved tube-type mass flowmeter.

Background technique

In order to resist this forced vibration, the fluid will give the pipe a reaction force perpendicular to its flow direction. Under the action of this force called Coriolis effect, the vibration of the pipe is out of sync. There will be differences in the time of vibration, (the difference is due to the opposite flow direction of the fluid in the inlet section and the outlet section), which is called phase time difference. This difference is directly proportional to the magnitude of the fluid mass flow through the tube. If the size of this time difference can be detected through the circuit, the size of the mass flow can be determined. This kind of flowmeter is called Coriolis direct mass flowmeter. The biggest difference between it and dozens of conventional volumetric flowmeters currently in use in the world is the size of the mass it measures, and the unit used is kg/h . A flowmeter that uses mass (such as kilograms) as a unit is more accurate and constant than a volumetric flowmeter that uses volume (such as liters or cubic meters) as a unit. Because mass follows the law of conservation.

The utility model of the Coriolis force mass flowmeter is the result of decades of hard work in the scientific and technological circles. It not only has accuracy, repeatability, and stability, but also has no blocking elements and moving parts in the fluid channel, so it is reliable. Good performance, long service life, and can also measure the flow rate of high viscosity fluid and high pressure gas. Now the clean fuel compressed natural gas (CNG) used in automobiles is measured by it, and it is more and more used in petroleum, chemical industry, metallurgy, building materials, papermaking, medicine, food, bioengineering, energy, aerospace and other industrial sectors. more and more widely. Its advent has brought about a profound change in fluid measurement technology, and is praised by experts as the mainstream flowmeter in the 21st century.

The Coriolis mass flowmeter is a novel instrument for directly and precisely measuring the mass flow rate of fluids. The main body of the structure adopts two U-shaped tubes side by side, so that the curved parts of the two tubes vibrate slightly towards each other, and the two sides The straight tubes will vibrate accordingly, that is, they will move closer or open at the same time, that is, the vibration of the two tubes is synchronous and symmetrical. If a fluid is introduced into the tube to flow forward along the tube while the tube vibrates synchronously, the tube will force the fluid to vibrate up and down with it.

At present, in order to transport more fluids, pipes with larger diameters are used. However, when measuring the mass of fluids with large pipe diameters, the existing Coriolis mass flowmeters are prone to measurement errors due to the large diameter of the pipes. , reducing reliability. In the technical field of mass flowmeter sensor manufacturing at home and abroad, the geometry of flow tubes mostly adopts ∪ type, Ω type and slightly curved type. The ∪ type and Ω type have large pressure loss and large volume; after the diameter of the flow tube increases, it is difficult to manufacture, which has become an obstacle to the development of large-diameter sensors; there are also difficulties in magnetoelectric drive, and the detection accuracy is difficult to meet the design requirements. Most of the existing mass flowmeter sensor products are 2-tube type (∪ type, Ω-type) and 4-tube type (disc type), that is, 2 or 4 flow tubes work. 4. The tube structure is symmetrically arranged in two tubes. When the measured medium is liquid phase, gas accumulation in the upper tube is easy to occur, which affects the measurement and detection; second, the flow tubes are arranged symmetrically in pairs, so that the volume of the sensor increases with the caliber of the mass flowmeter. Increase rather than linear increase, which restricts the development of mass flowmeters (4 tube types are the largest design); third, the diameter of the flow tube increases with the increase of the diameter of the mass flowmeter, making it more difficult to drive and unable to accurately detect .

Therefore, the utility model provides a micro-curved tube-type mass flow meter.

Utility model content

Aiming at the problems in the prior art, the purpose of this utility model is to provide a micro-curved tube-type mass flowmeter, which overcomes the difficulties of the prior art and can reduce the flow rate as much as possible by means of multi-tube arrangement. The diameter of the flow tube used for Coriolis mass flow measurement, thereby reducing measurement errors and improving measurement reliability.

Embodiments of the present utility model provide a micro-curved tubular mass flowmeter, including:

a shell;

Two diversion sleeves are respectively connected to the two ends of the shell;

A plurality of arcuate guide tubes are arranged in the housing, and the two ends of the guide tubes are respectively connected to the guide sleeve;

A pair of arcuate flow tubes are arranged in the housing, the two ends of the flow tubes are respectively connected to the diversion sleeve, and the length of the flow tubes is equal to the length of the diversion tube;

a driving element fixed to the two flow tubes, the driving element drives a pair of the flow tubes to vibrate, and the driving element is located in the center of the flow tubes; and

Two detection elements, each of the detection elements is respectively fixed on the two flow tubes to detect vibration, and the two driving elements are respectively located on both sides of the driving element.

Preferably, each of the guide tubes and each of the flow tubes includes five straight pipe sections and four curved pipe sections respectively connected to the straight pipe sections.

Preferably, the housing includes a support tube and an arc cover;

The two ends of the support tube are respectively connected to the diversion sleeve, and the support tube is coaxial with the two diversion sleeves, and the outer wall of the support tube is provided with two openings, and the local guide tube and the flow rate a segment of the arcuate portion of the tube protruding from the support tube through the opening;

The arc cover is connected with the support tube, and the arc cover covers the pipe section of the guide tube and the flow tube protruding from the arcuate part of the support tube.

Preferably, it also includes a plurality of fixing plates, the fixing plates are arranged at intervals in the housing along the extension direction of the guide tube, and a plurality of positioning holes are provided on the fixing plates, and the guide tube and the guide tube The interference fit of the above positioning hole.

Preferably, the positioning holes are arranged in a honeycomb shape or in a matrix on the fixing plate.

Preferably, the outer and inner diameters of the draft tube and the flow tube are equal.

Preferably, when the housing is arranged along a horizontal plane, the level of the two flow tubes is lower than the level of the draft tube.

Preferably, the distance between the adjacent flow guide tubes and/or the flow tubes is equal.

Preferably, the number of the guide tubes is greater than 7.

Preferably, two damping plates are further included, each of the damping plates is welded to two of the flow tubes, and the damping plates are located at both ends of the flow tubes in the length direction.

The micro-bend tube-type mass flowmeter of the utility model is in the shape of a micro-bend tube bundle, with 4 or more multi-branch flow tubes arranged in a structure, and the tube bundle of the micro-bend section is placed on the lower side (shaped like a bow), which is easy to exhaust and small in size ; The optimized diameter of the flow tube can be used for the design and production of any caliber sensor; the design of the fixed small-diameter flow tube lays the foundation for the free development and large-scale development of the mass flowmeter caliber, and for the standardized production of the sensor It is possible; at the same time, the small-diameter flow tube is sensitive to drive and easy to detect accurately.

The micro-curved tube-type mass flowmeter of the utility model can reduce the diameter of the flow tube used for Coriolis mass flow measurement as much as possible under the condition of constant flow through the arrangement of multiple tubes, thereby reducing the measurement error and improve measurement reliability.

Description of drawings

Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings.

Fig. 1 is the three-dimensional view of the micro-curved tubular mass flowmeter of the present invention;

Fig. 2 is the schematic diagram of the micro-curved tubular mass flowmeter of the present invention;

Fig. 3 is a left view based on Fig. 2;

Fig. 4 is the right view based on Fig. 2;

Fig. 5 is a perspective view of a micro-curved tubular mass flowmeter of the present invention after the housing is removed;

Fig. 6 is a perspective view of another angle of view of the micro-curved tubular mass flowmeter of the present invention after the housing is removed;

Fig. 7 is a schematic diagram of the micro-curved tubular mass flowmeter of the present invention after the housing is removed;

Fig. 8 is the sectional view of A-A direction in Fig. 5;

Fig. 9 is a left view based on Fig. 7;

Fig. 10 is a schematic diagram of an arrangement of the guide tube and the flow tube in the utility model;

Fig. 11 is another arrangement diagram of the guide tube and the flow tube in the utility model;

Fig. 12 is a schematic diagram of another arrangement of the guide tube and the flow tube in the utility model; and

Fig. 13 is a schematic diagram of another arrangement of the guide tube and the flow tube in the present invention.

reference sign

1 diversion sleeve

21 diversion tube

22 flow tube

3 support tube

4 shell

5 Fixing plate

6 detection element

7 drive elements

8 damping plate

detailed description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully incorporate the concepts of example embodiments. communicated to those skilled in the art. The same reference numerals denote the same or similar structures in the drawings, and thus their repeated descriptions will be omitted.

Fig. 1 is a perspective view of the micro-curved shell and tube mass flowmeter of the present invention. Fig. 2 is a schematic diagram of the micro-curved shell and tube mass flowmeter of the present invention. FIG. 3 is a left side view based on FIG. 2 . FIG. 4 is a right side view based on FIG. 2 . Fig. 5 is a perspective view of a micro-curved tube-and-tube mass flowmeter of the present invention after the housing is removed. Fig. 6 is a perspective view of another angle of view of the micro-curved tube-and-tube mass flowmeter of the present invention after the housing is removed. Fig. 7 is a schematic diagram of the micro-curved tube-and-tube mass flowmeter of the present invention after the housing is removed. Fig. 8 is a cross-sectional view along A-A in Fig. 5 . FIG. 9 is a left side view based on FIG. 7 .

As shown in Figures 1 to 9, the micro-curved tubular mass flowmeter of the present invention includes: a housing, two diversion sleeves 1, a plurality of arcuate diversion tubes 21, a pair of arcuate flow tubes 22, A driving element 7 , two detecting elements 6 , multiple fixing plates 5 and two damping plates 8 .

The shell in this embodiment is a component containing the arcuate tube bundle, and is welded on the support tube. It also has the function of shielding the frequency interference of the external environment. The shell includes a support tube 3 and an arc cover 4 . The two ends of the support tube 3 are respectively connected to the flow guide sleeve 1, and the support tube 3 is coaxial with the two flow guide sleeves 1, and the outer wall of the support tube 3 is provided with two openings, and the arcuate part of the partial flow guide tube 21 and the flow tube 22 The pipe section protrudes from the opening of the support pipe 3; the arc cover 4 is connected with the support pipe 3, and the arc cover 4 covers the duct section 21 and the flow pipe 22 protruding from the arc portion of the support pipe 3.

The two guide sleeves 1 are respectively connected to the two ends of the shell. The diversion sleeve 1 in the utility model is a member with holes evenly arranged, and has the function of shunting flow into the system medium. The diversion sleeve 1 is the core component to ensure that the medium forms a stable laminar flow without cavitation. The first end of the diversion sleeve 1 is connected to the support tube 3 , and the first end of the diversion sleeve 1 is provided with a plurality of connection nozzles, and each connection nozzle is respectively connected to a diversion pipe 21 or a flow pipe 22 . The second end of the diversion sleeve 1 is provided with an opening, which can be connected with a national standard high neck flange. The caliber of the national standard high-neck flange is the same as the caliber and working pressure of the mass flowmeter, and the dense surface is determined according to the working conditions. Between the first end and the second end of the diversion sleeve 1, there are flow channel bifurcations equal to the number of connecting nozzles. In the process from the first end to the second end, the flow channel bifurcations are collected to the second end. Openings, so as to realize the diversion or aggregation of multiple tubes (drain tube 21, flow tube 22).

A plurality of arcuate guide tubes 21 are arranged in the casing, and the two ends of the guide tubes 21 communicate with the guide sleeve 1 respectively. Two ends of the guide tube 21 are connected to the guide sleeve 1 respectively. Each draft tube 21 includes five straight pipe sections and four curved pipe sections respectively connected to the straight pipe sections. In the utility model, the function of the guide pipe 21 is only to guide the medium of the system. The quantity is related to the engineering caliber of the mass flowmeter. That is to say, the utility model is responsible for the diversion of the fluid through multiple guide tubes 21, and the guide tubes 21 do not participate in the measurement of the mass flow rate. When the micro-bending shell and tube mass flowmeter of the present invention is connected to a fluid pipe with a larger diameter, the flow requirement can be met by increasing the number of draft tubes 21 instead of changing the diameter of the draft tubes 21 . Preferably, the number of guide tubes is greater than 7, but not limited thereto. As the fluid flow increases, the number of guide tubes can be increased to 20, 30, 50, etc., but not limited thereto.

A pair of arcuate flow tubes 22 are arranged in the housing, and the two ends of the flow tubes 22 are connected to the flow guide sleeve 1 respectively, and the length of the flow tubes 22 is equal to the length of the flow guide tube 21 . Each flow tube 22 includes five straight pipe sections and four curved pipe sections respectively connected to the straight pipe sections. The flow tube 22 in the utility model is a basic component for metering flow, and is a pair. When the measured medium flows through, a sine wave induced electromotive force is generated under the action of 7, and the phase difference due to the difference in the Coriolis force at the inlet and outlet ends is proportional to the mass of the flowing medium, and the transmitter calculates and displays the mass flow rate based on this Value, output unit (T/h or Nm ³ /h). The flow tube 22 is made of 316L stainless steel. In the present utility model, the diversion sleeve 1 at one end of the support tube 3 divides the fluid into multiple tubes (drain tube 21, flow tube 22), and after passing the mass flow test, the other end of the support tube 3 A diversion sleeve 1 collects the fluids in multiple tube arrays (the diversion tube 21 and the flow tube 22 ).

In a preferred embodiment, the diversion sleeve 1, the diversion tube 21, the flow tube 22 and the support tube 3 in the utility model can be assembled and welded, and the diversion sleeve 1, the diversion tube 21, the flow tube 22 and the support tube 3 The material can be 304 stainless steel, which solves the problem of manufacturing fusion welding and reduces moving parts, but it is not limited thereto.

The driving element 7 is fixed on the two flow tubes 22 , the driving element 7 drives the pair of flow tubes 22 to vibrate, and the driving element 7 is located at the center of the flow tubes 22 . The driving element 7 in this embodiment may be an excitation component, which is composed of a permanent magnet, a coil winding and a bracket, and is fixed on the flow tube. When the coil winding receives the alternating power supply, the alternating magnetic field is generated along the hollow axis through the attraction and repulsion of the permanent magnet, which is coupled with the natural frequency of the flow tube, which is the basic operating frequency of the transmitter. Frequency range 200-400Hz.

Two detection elements 6 are respectively fixed to two flow tubes 22 to detect vibrations, and two drive elements 7 are respectively located on both sides of the drive element 7 . The detection element 6 is spaced apart from the driving element 7 by an end distance, so as to detect vibration better. The detection element 6 is composed of a permanent magnet, a coil winding and a bracket, and is fixed on the flow tube. When the flow tube vibrates, the permanent magnet and the coil winding generate relative motion to form a sine wave induced electromotive force. When a medium flows through, the induced electromotive force of the left and right coil windings under the Coriolis force produces a phase difference. The difference and the mass of the medium flowing are Proportional relationship, the transmitter calculates the output value accordingly.

The fixing plates 5 are arranged in the housing at intervals along the extension direction of the flow guide tube 21 , and a plurality of positioning holes are arranged on the fixing plate 5 , and the flow guide tube 21 is in interference fit with the positioning holes. The fixed plate 5 is a component fastened on the guide tube, so that the guide tube does not vibrate and eliminates the Coriolis force performance. The positioning holes are arranged in honeycomb or matrix on the fixing plate 5, but not limited thereto. The outer and inner diameters of the guide tube 21 and the flow tube 22 are equal, but not limited thereto. The distance between adjacent flow guide tubes 21 and/or flow tubes 22 is equal, but not limited thereto.

The utility model also includes a temperature sensor (not shown in the figure), which is connected to the outer wall of the draft tube 21 . The temperature sensor adopts PT100 platinum resistance to provide parameters for volume flow compensation and correction, and the output flow shows Nm ³ .

Each damping plate 8 is welded to two flow tubes 22 , and the damping plates 8 are located at both ends of the flow tubes 22 in the length direction. The damping plate 8 is combined with the flow tube 22 by vacuum brazing. The function of the damping plate 8 is to prevent the conduction of the vibration generated by the driving element 7 acting on the flow tube 22 and reduce signal interference.

In a preferred embodiment, referring to FIGS. 8 and 9 , when the support tube 3 is arranged along the horizontal plane, the level of the two flow tubes 22 is lower than the level of the draft tube 21 . The flow tube 22 is located at the bottom where the fluid passes to ensure that the flow tube 22 is filled with fluid, thereby reducing the generation of air bubbles as much as possible, and avoiding the interference of air bubbles on mass flow measurement.

In a preferred embodiment, FIG. 10 is a schematic diagram of an arrangement of the guide tubes and flow tubes in the present invention. As shown in FIG. In the arrangement of columns, two flow tubes 22 are located in the lowest row, and there are 14 guide tubes 21 in total.

In a preferred embodiment, Fig. 11 is another schematic diagram of arrangement of the guide tube and the flow tube in the present utility model, as shown in Fig. 11, the guide tube 21 and the flow tube 22 in the present utility model can be in four rows In the rectangular arrangement of four columns, there are only two flow tubes 22 in the first row and the fourth row to match the circular support tube 3 , and the two flow tubes 22 are located in the lowest row, and there are 10 flow tubes 21 in total.

In a preferred embodiment, Fig. 12 is a schematic diagram of another arrangement of the guide tube and the flow tube in the present utility model. As shown in Fig. 12, the guide tube 21 and the flow tube 22 in the present utility model can be inverted In trapezoidal arrangement, the two flow tubes 22 are located in the lowest row, and there are 18 guide tubes 21 in total, so as to match larger flow rates.

In a preferred embodiment, Fig. 13 is a schematic diagram of another arrangement of the guide tube and the flow tube in the present utility model, as shown in Fig. 13, the guide tube 21 and the flow tube 22 in the present utility model can form a honeycomb shape Arranged, two flow tubes 22 are located in the lowest row, a total of 22 flow guide tubes 21, so as to match greater flow.

The micro-curved tube-type mass flowmeter of the utility model has multiple curved flow tubes and diversion tubes to form a converging flow section, so that the sensor can reach any required caliber. Since the flow tube is "bow-shaped", although it is inconsistent with the thermal expansion of the support tube, the curve can be compensated.

In the micro-curved tube-type mass flowmeter of the utility model, the flow tube is similar to the tube type of the diversion tube, that is, the 4 bending radii are the same, and the 5 straight sections have the same total length although they are not equal in length, so the medium is in the same tube condition. same pressure loss. Due to the small "bow" tube, the pressure loss is relatively small.

When the micro-curved tube-and-tube mass flowmeter of the utility model is developed with any caliber sensor, only the number of flow tubes changes while the tube diameter remains unchanged, and the total length of the sensor basically remains unchanged. A little lengthening is due to the slight lengthening of the diversion sleeve and the change of the selection of the process flange.

The utility model has a simple structure and few components, and the micro-curved tube-type mass flowmeter is assembled by welding, so that there are few moving parts and wearing parts. The sensor has a long working life and less online maintenance.

The micro-curved tube-type mass flowmeter of the utility model can ensure that the diameter and length of the flow tube remain basically unchanged, thereby reducing manufacturing and management costs.

Generally, the micro-curved tube-type mass flowmeter of the utility model is accurate in detection, stable and reliable, easy to standardize the magnetoelectric output, and can be used in large-scale system control engineering. It can also lay the foundation for large-scale and socialized production of transmitters. It can also be adapted to various transmitters, and only adjust the parameters of the magnetoelectric windings for supporting production.

To sum up, the micro-curved tube-type mass flowmeter of the present invention can reduce the diameter of the flow tube used for Coriolis mass flow measurement as much as possible under the condition of constant flow rate by means of multi-tube arrangement , thereby reducing measurement errors and improving measurement reliability.

The above content is a further detailed description of the utility model in combination with specific preferred embodiments, and it cannot be assumed that the specific implementation of the utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the utility model belongs, on the premise of not departing from the concept of the utility model, some simple deduction or replacement can also be made, which should be regarded as belonging to the protection scope of the utility model.

Claims (10)

1. A kind of 1. micro-bend type shell and tube mass flowmenter, it is characterised in that including：

   One shell；

   Two flow guide sleeves (1), it is connected to the both ends of the shell；

   The mozzle (21) of more arch, is arranged in the shell, and the both ends of the mozzle (21) are respectively communicated with described lead Stream set (1)；

   The flowtube (22) of a pair of arch, is arranged in the shell, and the both ends of the flowtube (22) are respectively communicated with described lead Stream set (1), the length of the flowtube (22) and the equal length of the mozzle (21)；

   One driving element (7), is fixed on two flowtubes (22), and the driving element (7) drives a pair of flowtubes (22) vibration is produced, and the driving element (7) is located at the center of the flowtube (22)；And

   Two detecting elements (6), each detecting element (6) are individually fixed in two flowtube (22) the detection vibrations, and two The driving element (7) is located at the both sides of the driving element (7) respectively.
2. 2. micro-bend type shell and tube mass flowmenter according to claim 1, it is characterised in that the every mozzle (21) All include five straight line pipeline sections with flowtube every described (22) and connect four bending tube sections of the straight line pipeline section respectively.
3. 3. micro-bend type shell and tube mass flowmenter according to claim 2, it is characterised in that the shell includes a support Manage (3) and a circular arc cover (4)；

   The both ends of the support tube (3) connect the flow guide sleeve (1), and the support tube (3) and two flow guide sleeves (1) respectively Coaxially, the outer wall of the support tube (3) is provided with the arcuate section of two openings, the local mozzle (21) and flowtube (22) Pipeline section stretch out the support tube (3) from the opening；

   The circular arc cover (4) is connected with the support tube (3), and circular arc cover (4) cover covers the mozzle (21) and flowtube (22) pipeline section of the arcuate section of the support tube (3) is stretched out.
4. 4. micro-bend type shell and tube mass flowmenter according to claim 1, it is characterised in that also including multiple fixed plates (5), extension direction of the fixed plate (5) along the mozzle (21) is disposed in the shell, the fixed plate (5) Multiple positioning holes are provided with, the mozzle (21) is interference fitted with the positioning hole.
5. 5. micro-bend type shell and tube mass flowmenter according to claim 4, it is characterised in that the positioning hole is described solid Honeycomb arrangement or matrix arrangement on fixed board (5).
6. 6. micro-bend type shell and tube mass flowmenter according to claim 4, it is characterised in that the mozzle (21) and institute External diameter and the internal diameter for stating flowtube (22) are all equal.
7. 7. micro-bend type shell and tube mass flowmenter according to claim 1, it is characterised in that the shell is set along the horizontal plane When putting, the level height of two flowtubes (22) is less than the level height of the mozzle (21).
8. 8. micro-bend type shell and tube mass flowmenter according to claim 1, it is characterised in that the adjacent mozzle (21) And/or the spacing of the flowtube (22) is equal.
9. 9. micro-bend type shell and tube mass flowmenter according to claim 1, it is characterised in that the number of the mozzle (21) Amount is more than 7.
10. 10. micro-bend type shell and tube mass flowmenter according to claim 1, it is characterised in that also including two damping sheets (8), each damping sheet (8) is welded with two flowtubes (22), and the damping sheet (8) is located at the flowtube (22) Length direction both ends.