CN208606830U - A kind of linear tube Coriolis mass flowmeter - Google Patents

Abstract

The utility model discloses a kind of linear tube Coriolis mass flowmeters, it include: shell, main body, connector, fixed block, straight pipe type measurement pipe, electromagnetic loop bracket and coil block, it is characterized in that, the straight pipe type measurement pipe is at least two and arranged in parallel, and straight pipe type measurement pipe both ends are respectively arranged with fixed block；It is additionally provided with main body respectively on the outside of the fixed block；Main body outer end face is connected with shell, and main body outer end two sides are connected separately with connector；The electromagnetic loop bracket is fixed in straight pipe type measurement pipe, and institute's coil block is installed on electromagnetic loop bracket；The utility model substantially reduces the volume of flowmeter, reduce that flow, flow resistance be small, low pressure loss, the liquid mass flow that viscosity is high, impurity content is high can be measured, overall performance, sensitivity and the measurement range of linear tube Coriolis mass flowmeter are improved.

Description

A kind of linear tube Coriolis mass flowmeter

Technical field

The utility model relates to flow measurement quasi-instrument instrument field, especially a kind of linear tube Coriolis mass flow Meter.

Background technique

Mass flow measurement techniques are the emphasis that current national science and technology develops in process control field, to realize to various The measurement of high accuracy, high reliability of the medium under complicated environmental condition, coriolis mass flowmeters are with its superior property The new type measuring instrument table that the field is given priority to can be become, and meet the support demand of the great instrument and meter of country；Coriolis Mass flowmenter (hereinafter referred to as coriolis meter) is medium (gas or the liquid flowed through in pipeline based on Coriolis principle measurement Body) the parameters such as quality, density, temperature New Type of Intelligent Instrument.Specifically, coriolis meter straight pipe type measurement pipe does simple harmonic quantity It vibrates (or circular motion), when fluid media (medium) flows through straight pipe type measurement pipe with a certain speed, on the one hand medium is surveyed with straight pipe type Buret is made synchronous vibration (simple harmonic oscillation or circular motion), on the other hand continues with the speed through pipeline, medium is to pipe at this time Road generates the reaction force vertical with flow direction of medium, i.e., " Coriolis force "；Under this force, straight pipe type measurement pipe Synchronous vibration at symmetric position is changed into asynchronous vibration, and it is phase in vibration signal waveforms that this asynchronization, which is embodied in, Potential difference, the numerical value of phase difference and the mass flow of medium are directly proportional, and the phase difference of signal is calculated by detection circuit, can be obtained The mass flow of medium；Coriolis meter may be implemented to accurately measure mass of medium flow using above-mentioned principle, wherein directly Cast measurement pipe is its core component.It is different according to straight pipe type measurement pipe quantity, it is divided into single hose and double hose.Single hose is because of it Cause measurement accuracy poor vulnerable to extraneous vibration interference and serious null offset, therefore single hose practical application is less, due to Two-tube shape is identical, and intrinsic frequency is close, is easy starting of oscillation, the mobility status of measured medium is identical in two pipes, the phase of up-down vibration Position is on the contrary, the function and effect that generate of coriolis force measure tube shape not according to straight pipe type also on the contrary, therefore double hose is mostly used to design Together, bent tube type and straight pipe type can be divided into；Straight pipe type is since rigidity is big, and resonance frequency is high, and amplitude very little, since frequency is higher, Differ larger with industrial common mechanical vibration frequency, therefore not vulnerable to the interference of extraneous vibration；Be not easy to stockpile gas and residue, Outer dimension is smaller, low pressure loss, high-frequency, many advantages, such as solve many deficiencies of bent tube type to a certain extent, and it is big Amount, which is used in, cannot stockpile the work operating condition that gas or residue liquid are convenient for cleaning pipeline again, such as to the higher food of hygiene-type The fields such as product, pharmacy, therefore design a kind of straight pipe type mass flowmenter of high-performance and low-cost, i.e., increase China is in high-end instrument One of core competitiveness, and the trend for developing such sensor, the development of its measuring instrument at home is played to Guan Chong The effect wanted.

In currently available technology, most all using bent tube type, bent tube type divides U-shaped, micro-bend type, △ type, Ω type etc., In being most widely used with U-shaped, micro-bend type and △ type again, the micro-bend type of tradition due to reasons in structure, Yi Jicun medium (gas or Liquid) residue and cause additive error, and it is more complicated than straight pipe type to make processing；Meanwhile gradually mentioning with market demands Height, volume size, structure function of the micro-bend type of tradition etc. are by installation environment, the constraint of measure field harsh conditions, serious shadow Ring the extensive use for arriving coriolis meter.Market demands its to smaller volume, damage at low pressure, higher precision, more preferably stability etc. Direction is developed.

Summary of the invention

The utility model aim is: in view of the above problems, providing a kind of linear tube Coriolis mass flow Meter；The liquid mass flow error that the utility model solves the problems, such as that detection assay viscosity is high, impurity content is high is high；It solves Coriolis mass flowmeters sensitivity is not high, the small problem of measurement range；Also solve coriolis mass flowmeters volume Larger problem.

The technical solution adopted in the utility model is as follows:

A kind of linear tube Coriolis mass flowmeter, comprising: shell, main body, connector, fixed block, straight pipe type measurement pipe, Electromagnetic loop bracket and coil block, which is characterized in that the straight pipe type measurement pipe is at least two and arranged in parallel, straight tube Type measurement pipe both ends are respectively arranged with fixed block；It is additionally provided with main body respectively on the outside of the fixed block；Main body outer end face It is connected with shell, main body outer end two sides are connected separately with connector；The electromagnetic loop bracket is fixed in straight pipe type measurement pipe, institute Coil block is installed on electromagnetic loop bracket.

Since using the above structure, according to Coriolis effect, two straight pipe type measurement pipes being carried out using multiple form Welding and fixed, two straight pipe type measurement pipes are under the exciting of driving coil component, with its natural frequency vibration, and two straight tubes Type measurement pipe vibration phase is opposite.Due to the dither effect of straight pipe type measurement pipe, medium (the gas or liquid) stream in pipe is flowed through It is dynamic to obtain a Coriolis acceleration, the straight pipe type measurement pipe just coriolis force contrary with this acceleration by one.Due to Directly type straight pipe type measurement pipe is contrary into and out of coriolis force suffered by two sides, and it is delicate that straight pipe type measurement pipe occurs Torsion, torsion degree are inversely proportional with its torsional rigid, and directly proportional to instantaneous mass flow in pipe；Positioned at straight pipe type measurement pipe Influent stream side and go out stream side two inspection coil blocks detect two-way vibration signal, the phase difference and detection pipe of two paths of signals Degree of rocking, also referred to as instantaneous flow is directly proportional；By calculating the phase difference between these signals, mass flow can be calculated.

Further, the fixed block is for fixing straight pipe type measurement pipe；The shell is used to support and protects straight pipe type Measurement pipe and it is also used to be isolated vibration.

Since using the above structure, the fixed block is fixed in straight pipe type measurement pipe by vacuum brazing, fixed block institute In position by multiple positioning spacing mode, i.e. the both ends of measurement pipe respectively use two fixed blocks and two accurate machine adjunction heads, And it can effectively be connected after vacuum brazing and fixed function.The best position of fixed block in the utility model, It is determined by mechanical analysis, model analysis and the harmonic responding analysis in ANSYS finite element analysis；The shell is in addition to being used to support Except straight pipe type measurement pipe, main function is that the vibration of straight pipe type measurement pipe is isolated, in order to avoid make to connect with it in vibration measurement The other equipment connect are affected.

Further, there are two through-holes identical with straight pipe type measurement pipe size for the fixed block, for surveying straight pipe type Buret passes through fixed block.

Since using the above structure, connecting straight pipe type measurement pipe by through-hole significantly more efficient can fix measurement pipe.

Further, the electromagnetic loop bracket is 6, and is symmetrically fixed on two straight pipe type measurement pipe upper end center axis On line.

Due to using the above structure, the electromagnetic loop bracket will in pairs and be divided into three groups be symmetrically fixed on it is straight In cast measurement pipe.

Further, the coil block is coaxially assembled by coil and magnet and is constituted, and coil block includes a driving line Coil assembly and two detection coil components.

Since using the above structure, the driving coil component is mainly used for vibrating straight pipe type measurement pipe, described Detection coil component is mainly for detection of vibration signal.

Further, the coil is fixed in a straight pipe type measurement pipe by electromagnetic loop bracket, and the magnet is solid It is scheduled on another electromagnetic loop bracket symmetrical with the electromagnetic loop bracket of fixed coil.

Due to using the above structure, detection coil component and driving coil component are the matable assembly of coil and magnet, Good closed-loop system is collectively formed in the coil block and straight pipe type measurement pipe, has Coriolis sensor measurement pipe steady Fixed intrinsic frequency working condition, the influence of external disturbance are smaller.

Further, the driving coil component is fixed at straight pipe type measurement tube hub, the detection coil component point It is not fixed on coil block two sides.

Since using the above structure, driving coil component is located at the middle part of measurement pipe, detection coil component is located at driving line The two sides of coil assembly, i.e. the influent stream side of measurement pipe and out stream side, for detecting vibration signal.

Further, the straight pipe type measurement pipe is made of straight pipe and circular arc pipeline section, and the circular arc pipeline section difference is seamless It is connected to straight pipe both ends.

Since using the above structure, relative to the straight pipe type measurement pipe of not arc section, the straight pipe type with arc section is surveyed Buret sensitivity is higher, and minimum discrimination is higher, can be more accurate calculate the mass flow for flowing through the medium in pipe.

Further, the center spacing of two straight pipe type measurement pipes is 2.1D-2.7D；The D is straight pipe type measurement Pipe outside diameter value.

Since using the above structure, spacing can make the value detected more accurate in above-mentioned distance.

In conclusion by adopting the above-described technical solution, the beneficial effects of the utility model are:

1, the utility model has the detection structure using new cast, effectively increases the characteristic and product of resonant transducer Prime factor substantially reduces the volume of flowmeter, reduces that flow, flow resistance be small, low pressure loss, can measure viscosity Liquid mass flow high, impurity content is high, the processing is simple, at low cost, further improves linear tube Coriolis quality stream Overall performance, sensitivity and the measurement range of meter.

2, the utility model makes that the resonance frequency of measurement pipe is higher, stability is good, anti-using multiple positioning spacing mode Pinking is strong.

3, it is collectively formed between the detection coil component of the utility model, driving coil component and straight pipe type measurement pipe good Closed-loop system, make Coriolis sensor measurement pipe that there is stable intrinsic frequency working condition, the influence of external disturbance compared with It is small.

4, the utility model effectively reduces the volume of coriolis mass flowmeters.

Detailed description of the invention

The utility model will illustrate by example and with reference to the appended drawing, in which:

Fig. 1 is that linear tube Coriolis mass flowmeter watches structure chart figure attentively.

Fig. 2 is linear tube Coriolis mass flowmeter overlooking structure figure figure.

Fig. 3 is linear tube Coriolis mass flowmeter cross cut structure figure.

Fig. 4 is straight pipe type measurement pipe structure chart.

Wherein, 1- connector；2- main body；3- fixed block；4- electromagnetic loop bracket；5- detection coil component；6- driving coil Component；7- shell；8- straight pipe type measurement pipe；801- straight sections；802- circular arc pipe portion；9- coil block；901- coil；902- magnetic Iron.

Specific embodiment

All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive Feature and/or step other than, can combine in any way.

Any feature disclosed in this specification (including any accessory claim, abstract), unless specifically stated, It is replaced by other equivalent or with similar purpose alternative features.That is, unless specifically stated, each feature is a series of An example in equivalent or similar characteristics.

It should be noted that indicating positions such as term " two sides ", " outer end ", " upward " in the description of the present invention, Or positional relationship is all to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description the utility model and simplification is retouched It states, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation constructor, Therefore it should not be understood as limiting the present invention.

Embodiment 1

A kind of linear tube Coriolis mass flowmeter, as shown in Figure 1 to Figure 3, comprising: shell 7, connector 1, is consolidated main body 2 Determine block 3, straight pipe type measurement pipe 8, electromagnetic loop bracket 4 and coil block 9, the straight pipe type measurement pipe 8 is at least two and puts down Row arrangement, is in the present embodiment two, and 8 both ends of straight pipe type measurement pipe are respectively arranged with fixed block 3, is surveyed for fixing straight pipe type Buret 8；3 outside of fixed block is additionally provided with main body 2 respectively；The 2 outer end face of main body is connected with shell 7, is used to support With protection straight pipe type measurement pipe 8, while being also used to be isolated the vibration of straight pipe type measurement pipe 8,2 outer end two sides of main body are connected separately with Connector 1；The electromagnetic loop bracket 4 is fixed in straight pipe type measurement pipe 8, and institute's coil block 9 is installed on electromagnetic loop bracket 4 On.

The fixed block 3 is also set up there are two through-hole identical with 8 size of straight pipe type measurement pipe, for measuring straight pipe type Pipe 8 passes through；In the present embodiment, electromagnetic loop bracket 4 is 6, and is symmetrically fixed in two straight pipe type measurement pipes 8 It holds on central axis, is used for fixed coil component 9；The coil block 9 is that coaxially assembly is constituted by coil 901 and magnet 902, The coil 901 is fixed in a straight pipe type measurement pipe 8 by electromagnetic loop bracket 4, and the magnet 902 is fixed on and fixes On the symmetrical electromagnetic loop bracket 4 of electromagnetic loop bracket 4 of coil 901；In the present embodiment, the coil block 9 includes one A driving coil component 6 and two detection coil components 5, the driving coil component 6 are used to that straight pipe type measurement pipe 8 to be made to vibrate, The detection coil component 5 is used to detect the Various types of data generated when straight pipe type measurement pipe 8 is vibrated；The driving coil component 6 Positioned at 8 middle part of straight pipe type measurement pipe, detection coil component 5 is located at the two sides of driving coil component 6 and close to fixed block 3.

In the present embodiment, the center spacing of two parallel straight pipe type measurement pipes 8 is 2.1D-2.7D, wherein D is straight The outer diameter of cast measurement pipe 8；Spacing is also 2.1D-2.7D between through-hole on the fixed block 3, in straight pipe type measurement pipe 8 In the heart away from corresponding；The measurement pipe generally uses the accurate import tubing of 316L stainless steel, Hastelloy and other materials, The uniformity of the consistency and outer diameter tolerance that make straight pipe type measurement pipe 8 itself is guaranteed, so that two straight pipe types 8 tunnel of measurement pipe symmetry with higher after being welded and fixed, straight pipe type measurement pipe 8 itself also have good dynamic equilibrium special Property, it ensure that the whole machine balancing under sensor dynamic, to the guarantee with higher of the high-precision requirement of straight pipe type mass flowmenter.

It is fixed between the fixed block 3 and straight pipe type measurement pipe 8 by vacuum brazing, 3 position of fixed block passes through more Spacing mode is relocated, i.e. the both ends of measurement pipe respectively use two fixed blocks 3 and two accurate machine adjunction heads 1, and in vacuum pricker Postwelding can effectively be connected and fixed function.The best position of fixed block 3 in the utility model, is had by ANSYS Mechanical analysis, model analysis and harmonic responding analysis in finite element analysis determine, so that the resonance frequency of measurement pipe is higher, stablizes Property is good, shock resistance is strong；Two straight pipe type measurement pipes 8 are fixed simultaneously by way of vacuum brazing, and will not cause to deform, are made Two straight pipe type measurement pipes 8 characteristic it is identical, while limited torsion and bending needed for flow measurement is provided, according to phase The variation answered changes the resonance frequency of sensor, so being determined fixed block 3 in the position of straight pipe 801 according to designed frequency It sets, reduces the vibration coupling of internal measurement pipe, and make the shock resistance of straight pipe type measurement pipe 8 strong.

The present embodiment is welded and is consolidated using multiple form according to Coriolis effect, by two straight pipe type measurement pipes 8 Fixed, two straight pipe type measurement pipes 8 are under the exciting of driving coil component 6, and with its natural frequency vibration, and two straight pipe types measure 8 vibration phase of pipe is opposite.Due to the dither effect of straight pipe type measurement pipe 8, medium (gas or liquid) the flowing meeting in pipe is flowed through Obtain a Coriolis acceleration, the just coriolis force contrary with this acceleration by one of straight pipe type measurement pipe 8.Due to straight type Straight pipe type measurement pipe 8 it is contrary into and out of coriolis force suffered by two sides, and make straight pipe type measurement pipe 8 that delicate torsion occur Turn, torsion degree is inversely proportional with its torsional rigid, and directly proportional to instantaneous mass flow in pipe；Positioned at straight pipe type measurement pipe 8 Influent stream side and go out stream side two detection coil components 5 detect two-way vibration signal, the phase difference of two paths of signals and detection The degree of rocking of pipe, also referred to as instantaneous flow, it is directly proportional；By calculating the phase difference between these signals, mass flow can be calculated.

The utility model effectively increases the characteristic and product of resonant transducer by using straight pipe type straight pipe type measurement pipe 8 Prime factor substantially reduces the volume of flowmeter, reduces that flow, flow resistance be small, low pressure loss, can measure viscosity Liquid mass flow high, impurity content is high, the processing is simple, at low cost, further improves linear tube Coriolis quality stream The overall performance and measurement range of meter.

Embodiment 2

Embodiment 2 is similar with 1 structure of embodiment, and difference is, the straight pipe type measurement pipe 8 is by straight pipe 801 and circle Arc pipeline section 802 is constituted, as shown in Figure 4.

The circular arc pipeline section 802 is seamlessly connected respectively in 801 two sides of straight pipe, and the fixed block 3 is fixed on circular arc pipeline section It on 802, and presents with straight pipe 801 vertical, is overlapped with measurement pipe arc surface, i.e. 3 place face of fixed block is vertical with straight pipe 801 Or at an angle, while it is parallel with the fixed section of position of circular arc pipeline section 802, so that the resonance frequency of measurement pipe is higher, steady It is qualitative it is good, shock resistance is strong.In the present embodiment, the driving coil component 6 is fixed on 801 center of straight pipe, two detections Coil block 5 is fixed on 802 center of circular arc pipeline section, makes to form good close between coil block 9 and straight pipe type measurement pipe 8 Loop system makes Coriolis sensor measurement pipe have stable intrinsic frequency working condition, reduces the influence of external disturbance.

The circular arc pipeline section 802 is in the structure to raise upward, in the present embodiment, U-shaped；In one embodiment, also It can be triangle or raise upward slightly.

The present embodiment effectively increases the spirit of straight pipe type measurement pipe 8 by the circular arc pipeline section 802 in straight pipe type measurement pipe 8 Sensitivity and minimum discrimination, reduce the error of detection.

The utility model is not limited to specific embodiment above-mentioned.The utility model expands to any in this specification The new feature of middle disclosure or any new combination, and disclose any new method or process the step of or any new group It closes.

Claims (9)

1. a kind of linear tube Coriolis mass flowmeter, comprising: shell (7), main body (2), connector (1), fixed block (3), straight Cast measurement pipe (8), electromagnetic loop bracket (4) and coil block (9), which is characterized in that the straight pipe type measurement pipe (8) is extremely Less for two and arranged in parallel, straight pipe type measurement pipe (8) both ends are respectively arranged with fixed block (3)；Divide on the outside of the fixed block (3) It is not additionally provided with main body (2)；Main body (2) the outer end face is connected with shell (7), and main body (2) outer end two sides are connected separately with Connector (1)；The electromagnetic loop bracket (4) is fixed on straight pipe type measurement pipe (8), and institute's coil block is installed on electromagnetic coil branch On frame (4).

2. linear tube Coriolis mass flowmeter as described in claim 1, which is characterized in that the fixed block (3) is used for Fixed straight pipe type measurement pipe (8)；The shell (7) is used to support and protects straight pipe type measurement pipe (8) and is also used to be isolated vibration.

3. linear tube Coriolis mass flowmeter as claimed in claim 2, which is characterized in that the fixed block (3) has two A through-hole identical with straight pipe type measurement pipe (8) size, for making straight pipe type measurement pipe (8) to pass through fixed block (3).

4. linear tube Coriolis mass flowmeter as described in claim 1, which is characterized in that the electromagnetic loop bracket (4) it is 6, and is symmetrically fixed on two straight pipe type measurement pipe (8) upper end center axis.

5. linear tube Coriolis mass flowmeter as described in claim 1, which is characterized in that the coil block (9) by Coaxially assembly is constituted for coil (901) and magnet (902), and coil block (9) includes a driving coil component (6) and two detections Coil block (5).

6. linear tube Coriolis mass flowmeter as claimed in claim 5, which is characterized in that the coil (901) passes through Electromagnetic loop bracket (4) is fixed on a straight pipe type measurement pipe (8), and the magnet (902) is fixed on and fixed coil (901) Symmetrical another electromagnetic loop bracket (4) of electromagnetic loop bracket (4) on.

7. linear tube Coriolis mass flowmeter as claimed in claim 6, which is characterized in that the driving coil component (6) it is fixed at straight pipe type measurement pipe (8) center, the detection coil component (5) is individually fixed in driving coil component (6) two Side.

8. linear tube Coriolis mass flowmeter as described in claim 1, which is characterized in that the straight pipe type measurement pipe (8) it is made of straight pipe (801) and circular arc pipeline section (802), the circular arc pipeline section (802) is seamlessly connected respectively in straight pipe (801) both ends.

9. linear tube Coriolis mass flowmeter as described in claim 1, which is characterized in that two straight pipe types measurement The center spacing for managing (8) is 2.1D-2.7D；The D is straight pipe type measurement pipe (8) outer diameter value.