CN104296815A - High-precision liquid flow meter - Google Patents
High-precision liquid flow meter Download PDFInfo
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- CN104296815A CN104296815A CN201410577619.9A CN201410577619A CN104296815A CN 104296815 A CN104296815 A CN 104296815A CN 201410577619 A CN201410577619 A CN 201410577619A CN 104296815 A CN104296815 A CN 104296815A
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Abstract
The invention discloses a high-precision liquid flow meter. The shape of each of two measuring tubes is similar to triangle, so that the liquid flow meter is compact in overall structure and attractive in appearance. By means of the two tubes, sensitivity to outside vibration can be reduced, measurement of phase difference is easily achieved, and accordingly measurement precision is higher. Measuring tube fixing blocks can be used for clamping and positioning the two ends of the two measuring tubes, the two measuring tubes keep parallel, and the gap between the measuring tubes can not change. Heat absorbing fins are made of aluminum alloy, the contact area of the heat absorbing fins and normal-temperature air is large, the heat absorbing fins absorb outside heat and quickly transfer the heat to a connection rod according to the heat transfer principle, and the temperature of the connection rod rises so that low temperature can not be transferred to a transformer part, and the transformer normally works. The high-precision liquid flow meter is simple in structure, easy and convenient to operate, convenient to use, low in cost, wide in application range and suitable for being used and popularized.
Description
Technical field
The invention belongs to CNG/LNG mass flowmeter technical field, particularly relate to a kind of high-precision liquid flowmeter.
Background technology
Coriolis mass flowmeters is a kind of novel instrument directly and critically measuring liquid mass flow, if while pipe synchronous vibration therein, by in fluid ingress pipe, make it along flow forward in pipe, then pipe will force fluid up-down vibration therewith, fluid is in order to revolt this forced vibration, understand to one, the pipe reacting force vertical with its flow direction, this be called the effect of Coriolis effect power under, the vibrations of pipe are asynchronous, entrance pipe and outlet section pipe there will be difference on the time vibrated, (difference coriolis force direction suffered by entrance and outlet section fluid is contrary), this is called phase time difference.This species diversity is directly proportional to the size of the liquid mass flow flowing through pipe; If the size of this time difference can be detected by circuit, then just can by the size of mass rate to determining.This flowmeter is referred to as coriolis mass flowmeters, it with in the world current the maximum size not being both the quality that it is surveyed of tens kinds of conventional volumeters, the unit of use is kg/min.Accurate and constant with the volumeter of flowmeter ratio volume (as liter or the cubic meter) office of quality (as kilogram) office.Coriolis mass flowmeters has accuracy, repeatability, stability, and in fluid passage, be provided with flow blocking element and movable member, thus its good reliability, long service life, can also measure the flow of high viscosity fluid and gases at high pressure simultaneously.At industrial sectors such as oil, chemical industry, metallurgy, building materials, papermaking, medicine, food, bioengineering, the energy, space flight, its application is also more and more extensive.
Wherein coriolis mass flowmeters belongs to LNG aerating metering outfit, and along with the high speed development of LNG technology, higher to the functional requirement of aerating equipment, accuracy requirement is higher, and required occasion increases.
Summary of the invention
The invention provides a kind of high-precision liquid flowmeter, the measuring accuracy being intended to solve the liquid flowmeter that prior art provides is lower, cannot meet actual user demand problem.
The object of the present invention is to provide a kind of high-precision liquid flowmeter, this high-precision liquid flowmeter comprises: Sensor section and transducer portion, described Sensor section comprises the double measuring tube be located in housing, the middle part of described housing is connected with transducer portion line by adapter sleeve, described adapter sleeve is connected with transducer portion, in described adapter sleeve, is provided with seal assembly, the two ends of described double measuring tube bend in the middle part of it respectively relatively, the middle part outwardly convex of described double measuring tube is made to form lug boss, on described double measuring tube, the both sides of bending place is equipped with the fixed block of clamping position, and the summit of described lug boss and the tipping tube of both sides thereof are provided with coil brace, the summit place of described double measuring tube upper projecting portion is provided with drive coil, on described double measuring tube lug boss both sides, summit tipping tube in the middle part of be respectively equipped with magnetic test coil, the lead-in wire of described drive coil and the lead-in wire of magnetic test coil are connected on circuit board, described circuit board is positioned on the body below lug boss, the outer wall of described double measuring tube entrance point is provided with temperature sensor, the lead-in wire of described temperature sensor is wrapped in insulation tube, described insulation tube is walked spool and is fixed on body, insulated wire is caused circuit board by described insulation tube, described insulated wire adopts fly line mode to be connected on circuit board, described drive coil, the lead-in wire of magnetic test coil and temperature sensor enters adapter sleeve and passes seal assembly in connecting rod, be connected on transducer portion simultaneously.
Further, described double measuring tube is formed between the tipping tube of both sides, lug boss summit the cast angle of a=80 °-100 °; The cast height S=80-130mm on described double measuring tube upper projecting portion summit; Described double measuring tube is made up of the testing tube that two are parallel to each other, the test tube gap T=2-8mm wherein between two testing tubes.
Further, the two ends of described double measuring tube are provided with two groups of symmetrical fixed block groups, and the bending place that described fixed block is mounted on double measuring tube, by two parallel testing tube clamping positions, is wherein often organized fixed block group and comprised two fixed blocks.
Further, described body is provided with binding post, and described binding post passes from circuit board, and the lead-in wire of described drive coil is bundled on this binding post by dark brown adhesive tape.
Further, described seal assembly comprises the base of ceramic be affixed with adapter sleeve inwall, through the copper post having wiring in described base of ceramic, described base of ceramic is butted on the step in adapter sleeve by copper sheathing, any surface of contact between described adapter sleeve, base of ceramic, copper sheathing with copper post all adopts vacuum brazing mode to be connected.
Further, described drive coil and magnetic test coil are connected to enameled wire, and wherein enameled wire is connected with higher temperature line, and the end head of described higher temperature line is fixed in housing cavity by cabling fixed block, and described higher temperature line is wrapped in insulation tube; The lead-in wire of described temperature sensor is wrapped in insulation tube; Higher temperature line is introduced in connecting rod by described insulation tube, and described higher temperature line passes through entering adapter sleeve and is connected to copper post in connecting rod.
Further, described fixed block comprises symmetrical left fixture block and right fixture block, the corresponding sides of described left fixture block and right fixture block are respectively equipped with two arc gaps, distance between two arc gaps on same fixture block is corresponding with the distance between double measuring tube, can grip double measuring tube when the corresponding sides on described left fixture block and right fixture block are cooperatively interacted.
Further, on the limit that described left fixture block is mutually corresponding with right fixture block, be provided with the positioning step that can cooperatively interact, the interior arc dia of described arc gap is greater than the outer diameter of single measuring tube in double measuring tube.
Further, one end outer wall of described double measuring tube is welded with temperature sensor fixed block, described temperature sensor fixed block is provided with the jack holding temperature sensor, a side of described temperature sensor fixed block is set to the laminating cambered surface that can match with measuring tube outer wall, the longitudinal direction of described temperature sensor fixed block offers the jack holding temperature sensor, the size of described jack is less than the physical dimension of temperature sensor, and described jack is small top and big bottom bellmouth in the longitudinal direction of temperature sensor fixed block.
Further, described Sensor section is connected by connecting rod with between transducer portion, described connecting rod is provided with heat absorbing sheet, described heat absorbing sheet is made up of the cylindrical shell be connected on connecting rod and the annular blade be distributed on drum surface, described cylindrical shell and annular blade all adopt aluminum alloy materials to make, described cylindrical shell and annular blade are an one-piece construction, and adopt interference fit to be placed on connecting rod by the endoporus of cylindrical shell.
High-precision liquid flowmeter provided by the invention, double measuring tube adopts the cast on similar triangle both sides, makes meter overall compact conformation, good looking appearance; Adopt the two-tube susceptibility reducing external shock, easily realize the measurement of phase differential, thus make measuring accuracy higher; Clamping position can be carried out in the two ends of double measuring tube by measuring tube fixed block, makes keeping parallelism between double measuring tube, and spacedly can not change; Heat absorbing sheet is made up of aluminium alloy, large with normal temperature air surface of contact, and according to heat trnasfer principle, heat absorbing sheet absorbs extraneous heat and is transmitted to connecting rod rapidly, makes the temperature of connecting rod increase, and such Conduction At Low Temperature, less than transducer portion, ensures that transmitter normally works; Temperature sensor adopts temperature sensor fixed block to be fixed on tube wall, bonding without the need to adopting glue to carry out, and can effectively avoid thermometer to depart from from tube wall, make measurement result there will not be deviation, thus guaranteed flow meter steady operation; This high-precision liquid flowmeter structure is simple, easy and simple to handle, easy to use, with low cost, applied widely, is applicable to applying.
Accompanying drawing explanation
Fig. 1 is the coil fly line structural representation of the high-precision liquid flowmeter that the embodiment of the present invention provides;
Fig. 2 is the partial top view of Fig. 1;
Fig. 3 is the structural representation of the double measuring tube that the embodiment of the present invention provides;
Fig. 4 is the front view of the double measuring tube of Fig. 3;
Fig. 5 is the vertical view of Fig. 3;
The schematic diagram of connection wire sealing structure in the high-precision liquid flowmeter that Fig. 6 embodiment of the present invention provides;
Fig. 7 is the structural representation of the measuring tube fixed block that the embodiment of the present invention provides;
Fig. 8 is Fig. 7 is A-A cut-open view;
Fig. 9 is the vertical view of Fig. 7;
Figure 10 is the I partial schematic diagram in Fig. 8;
Figure 11 is the schematic diagram of the temperature sensor fixing structure that the embodiment of the present invention provides;
Figure 12 is the structural representation of the temperature sensor fixed block that the embodiment of the present invention provides;
Figure 13 is the structural representation of the heat absorbing sheet that the embodiment of the present invention provides.
In figure: 1, magnetic test coil; 2, enameled wire; 3, drive coil; 4, double measuring tube; 5, dark brown adhesive tape; 6, binding post; 7, magnetic test coil; 8, circuit board; 9, temperature sensor; 10, body; 11, spool is walked; 12, insulation tube; 13, coil brace; 14, fixed block; 14-1, left fixture block; 14-2, right fixture block; 14-3, arc gap; 14-4, positioning step; A-cast angle, S-cast height, T-test tube gap; 15, adapter sleeve; 16, base of ceramic; 17, copper sheathing; 18, copper post; 19, temperature sensor fixed block; 20, jack; 21, laminating cambered surface; 22, transducer portion; 23, Sensor section; 24, connecting rod; 25, heat absorbing sheet.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is described in further detail.Should be appreciated that specific embodiment described herein only in order to explain the present invention, and be not used in restriction invention.
Fig. 1 shows the structure of the high-precision liquid flowmeter that the embodiment of the present invention provides.For convenience of explanation, illustrate only part related to the present invention.
This high-precision liquid flowmeter comprises: Sensor section 23 and transducer portion 22, Sensor section 23 comprises the double measuring tube 4 be located in housing, the middle part of housing is connected with transducer portion 22 line by adapter sleeve 15, adapter sleeve 15 is connected with transducer portion 22, in adapter sleeve 15, is provided with seal assembly, the two ends of double measuring tube 4 bend in the middle part of it respectively relatively, the middle part outwardly convex of double measuring tube 4 is made to form lug boss, on double measuring tube 4, the both sides of bending place is equipped with the fixed block 14 of clamping position, and the summit of lug boss and the tipping tube of both sides thereof are provided with coil brace 13, the summit place of double measuring tube 4 upper projecting portion is provided with drive coil 3, on double measuring tube 4 lug boss both sides, summit tipping tube in the middle part of be respectively equipped with magnetic test coil 1, the lead-in wire of drive coil 3 and the lead-in wire of magnetic test coil 1 are connected on circuit board 8, circuit board 8 is positioned on the body 10 below lug boss, the outer wall of double measuring tube 4 entrance point is provided with temperature sensor 9, the lead-in wire of temperature sensor 9 is wrapped in insulation tube 12, insulation tube 12 is walked spool 11 and is fixed on body 10, insulated wire is caused circuit board 8 by insulation tube 12, insulated wire adopts fly line mode to be connected on circuit board 8, drive coil 3, the lead-in wire of magnetic test coil 1 and temperature sensor 9 enters adapter sleeve 15 and passes seal assembly, be connected in transmitter 22 part simultaneously.
In embodiments of the present invention, double measuring tube 4 is formed between the tipping tube of both sides, lug boss summit the cast angle of a=80 °-100 °; The cast height S=80-130mm on double measuring tube 4 upper projecting portion summit; Double measuring tube 4 is made up of the testing tube that two are parallel to each other, the test tube gap T=2-8mm wherein between two testing tubes.
In embodiments of the present invention, the two ends of double measuring tube 4 are provided with symmetrical two groups of fixed blocks 14 groups, the bending place that fixed block 14 is mounted on double measuring tube 4, by two parallel testing tube clamping positions, is wherein often organized fixed block 14 groups and is comprised two fixed blocks 14.
In embodiments of the present invention, body 10 is provided with binding post 6, and binding post 6 passes from circuit board 8, and the lead-in wire of drive coil 3 is bundled on this binding post 6 by dark brown adhesive tape 5.
In embodiments of the present invention, seal assembly comprises the base of ceramic 16 be affixed with adapter sleeve 15 inwall, through the copper post 18 having wiring in base of ceramic 16, base of ceramic 16 is butted on the step in adapter sleeve 15 by copper sheathing 17, and adapter sleeve 15, base of ceramic 16, any surface of contact between copper sheathing 17 with copper post 18 all adopt vacuum brazing mode to be connected.
In embodiments of the present invention, drive coil 3 and magnetic test coil 1 are connected to enameled wire 2, and wherein enameled wire 2 is connected with higher temperature line, and the end head of higher temperature line is fixed in housing cavity by cabling fixed block 14, and higher temperature line is wrapped in insulation tube 12; The lead-in wire of temperature sensor 9 is wrapped in insulation tube 12; Insulation tube 12 is fixed in inner walls by chute, and higher temperature line is introduced in connecting rod 24 by insulation tube 12, and described higher temperature line is interior through entering adapter sleeve 15 and being connected to copper post 18 from connecting rod 24.
In embodiments of the present invention, fixed block 14 comprises symmetrical left fixture block 14-1 and right fixture block 14-2, the corresponding sides of left fixture block 14-1 and right fixture block 14-2 are respectively equipped with two arc gap 14-3, distance between two arc gap 14-3 on same fixture block is corresponding with the distance between double measuring tube 4, can grip double measuring tube 4 when the corresponding sides on left fixture block 14-1 and right fixture block 14-2 are cooperatively interacted.
In embodiments of the present invention, on the limit that left fixture block 14-1 is mutually corresponding with right fixture block 14-2, be provided with the positioning step 14-4 that can cooperatively interact, the interior arc dia of arc gap 14-3 is greater than the outer diameter of single measuring tube in double measuring tube 4.
In embodiments of the present invention, one end outer wall of double measuring tube 4 is welded with temperature sensor fixed block 19, temperature sensor fixed block 19 is provided with the jack 20 holding temperature sensor 9, a side of temperature sensor fixed block 19 is set to the laminating cambered surface 21 that can match with measuring tube outer wall, the longitudinal direction of temperature sensor fixed block 19 offers the jack 20 holding temperature sensor 9, the size of jack 20 is less than the physical dimension of temperature sensor 9, and jack 20 is small top and big bottom bellmouth in the longitudinal direction of temperature sensor fixed block 19.
In embodiments of the present invention, be connected by connecting rod 24 between Sensor section 23 with transducer portion 22, connecting rod 24 is provided with heat absorbing sheet 25, heat absorbing sheet 25 is made up of the cylindrical shell be connected on connecting rod 24 and the annular blade be distributed on drum surface, cylindrical shell and annular blade all adopt aluminum alloy materials to make, cylindrical shell and annular blade are an one-piece construction, and adopt interference fit to be placed on connecting rod 24 by the endoporus of cylindrical shell.
Below in conjunction with drawings and the specific embodiments, application principle of the present invention is further described.
As shown in Figures 3 to 5, the measuring tube structure of high-precision liquid flowmeter provided by the invention, the double measuring tube 4 being positioned at Sensor section 23 is included in flowmeter, the two ends of double measuring tube 4 bend in the middle part of it respectively relatively, make the middle part outwardly convex of double measuring tube 4 form lug boss, double measuring tube 4 is formed between the tipping tube of both sides, lug boss summit the cast angle of a=80 °-100 °; The cast height S=80-130mm on double measuring tube 4 upper projecting portion summit; Double measuring tube 4 is made up of the testing tube that two are parallel to each other, the test tube gap T=2-8mm wherein between two testing tubes; On double measuring tube 4, the both sides of bending place is equipped with the fixed block 14 of clamping position, and the two ends of double measuring tube 4 are provided with symmetrical two groups of fixed blocks 14 groups, the bending place that fixed block 14 is mounted on double measuring tube 4 is by two parallel testing tube clamping positions, wherein often organize fixed block 14 groups and comprise two fixed blocks 14, the summit of lug boss and the tipping tube of both sides thereof are provided with coil brace 13; The coil brace 13 being positioned at double measuring tube 4 lug boss summit lays drive coil 3, and the coil brace 13 be positioned on tipping tube lays magnetic test coil 1.
The measuring tube structure of high-precision liquid flowmeter provided by the invention, the two ends of double measuring tube 4 bend relative to middle part, or the middle part convex of double measuring tube 4 forms lug boss, and this lug boss forms the both sides being similar to triangle cast; Coil brace 13 is fixed on double measuring tube 4 equally, the position of drive coil 3 support determines the vibration stimulus position of double measuring tube 4, wherein be provided with coil brace 13 at the summit place of this lug boss, can be used for placing drive coil 3, for the vibration of whole double measuring tube 4 provides power, and be tipping tube in these both sides, summit, the middle part of this tipping tube is installed on coil brace 13, can be used for laying magnetic test coil 1, magnetic test coil 1 needs mounting magnetic steel and magnetic test coil 1, measure phase difference, draws mass rate; Adopt the two-tube susceptibility reducing external shock simultaneously, easily realize the measurement of phase differential.The position of fixed block 14 determines the vibration frequency of double measuring tube 4 vibrations end, therefore fixed block 14 is located at the both sides of bending place, and is welded with double measuring tube 4 by fixed block 14, play the effect at fixing two ends.High-precision liquid flowmeter provided by the invention, by the double measuring tube 4 of the thin-walled fixed, double measuring tube 4 resonance or the excitation close to resonance in addition in center.Like this, if measuring section is regarded as two sections that separate from center, so these two sections are just equivalent to rotate back and forth motion around two ends point of fixity respectively.When fluid flows to the other end from one end, just create Coriolis force, make two halves section before and after double measuring tube 4 mid point produce the contrary distortion in direction, and then produce phase differential; Measure phase differential with electromagnetic principle, just calculate the data such as quality, flow, density by transmitter.
Cast angle, the cast height of lug boss all have impact to double measuring tube 4 vibration frequency and vibration stimulus, therefore need strictly to control cast angle a=80 ° or 90 ° or 100 °, can select between a=80 °-100 °, make double measuring tube 4 be convenient to shaping; Cast height S=80mm or 90mm or 100mm or 110mm or 120mm or 130mm, can select between S=80-130mm; Be able to control the vibration frequency of double measuring tube 4, just can guarantee accurately to measure phase differential on double measuring tube 4, thus calculate the data such as quality, flow, density by transmitter.Double measuring tube 4 is parallel to each other, double measuring tube 4 is made to form two-tube pattern, the susceptibility of external shock can be reduced, easily realize the measurement of phase differential, wherein the size in test tube gap has influence on the frequency of double measuring tube 4 vibration and vibratile amplitude, has larger impact to the measuring accuracy of its phase differential; Therefore need hole test tube gap T=2mm or 4mm therebetween or 5mm or 6mm or 8mm, can select between T=2-8mm.
The measuring tube structure of high-precision liquid flowmeter provided by the invention, structure is simple, easy and simple to handle, easy to use, with low cost, applied widely, is applicable to applying; Double measuring tube 4 adopts similar triangle cast to make meter overall compact conformation, good looking appearance; Adopt the two-tube susceptibility reducing external shock, easily realize the measurement of phase differential.
The connection wire sealing structure of high-precision liquid flowmeter provided by the invention, Sensor section 23 is included in flowmeter, the case of Sensor section 23 is connected with the adapter sleeve 15 passed for circuit, the inwall of adapter sleeve 15 is provided with step surface, this step surface is lined with copper sheathing 17, adapter sleeve 15 inwall is fitted with wiring pedestal, and the end face of wiring pedestal is placed on copper sheathing 17, through the copper post 18 having wiring in wiring pedestal.
Owing to have employed said structure, wherein high-precision liquid flowmeter is made up of Sensor section 23 and transducer portion 22, and the signal that Sensor section 23 records through adapter sleeve 15 by signal wire, and is passed in transducer portion 22 and carries out data computational analysis.Under this flowmeter is in low temperature environment in use, and when environment temperature exceeds the permissible value of electronic product, likely there will be electronics skew, misoperation and data instability; Work is carried out under Sensor section 23 needs the condition of airtight isolated air simultaneously, can be attached on measurement tube wall because the water in the middle of air meets the cold water that becomes, to measuring tube additional mass, cause working sensor unstable, so the interface of signal wire must reach sealing.Each signal wire in Sensor section 23 respectively correspondence is wired on copper post 18, all copper posts 18 are through after wiring pedestal, again copper sheathing 17 is padded on the step surface in adapter sleeve 15, then wiring pedestal is placed on this copper sheathing 17, because pottery is different from stainless steel hot expansion coefficient, base of ceramic 16 and adapter sleeve 15 are by together with Welding, so breaking may appear in pottery when thermal expansion or cold events, therefore need to pad copper sheathing 17 as contraction or expansion transition, avoid hermetically-sealed construction to destroy.Completely cut off between the Sensor section 23 of flowmeter and the external world and form good sealing effectiveness, thus make the working stability of whole Sensor section 23, the performance of whole flowmeter can be guaranteed.
The connection wire sealing structure of high-precision liquid flowmeter provided by the invention, wiring pedestal is the base of ceramic 16 adopting pottery to make.
Owing to have employed said structure, copper sheathing 17 is as transition, hermetically-sealed construction expands when temperature variation or shrinks and all can not be destroyed, therefore used in flowmeter, its original shape and structure can be kept, therefore under normal temperature and low temperature environment, all can reach good sealing effectiveness, the phenomenons such as gas leakage can not occur, guarantee the working stability of Sensor section 23 in whole flowmeter.
As shown in Figure 6, the connection wire sealing structure of high-precision liquid flowmeter provided by the invention, adapter sleeve 15, base of ceramic 16, between copper sheathing 17 with copper post 18, arbitrary surface of contact all adopts vacuum brazing mode to be connected.
Owing to have employed said structure, adopt the mode of vacuum brazing to weld at the surface of contact place of all parts, effective sealing can be formed, the two ends of connecting pipe are completely cut off, and adopting welding manner sealing, sealing is more reliable, can not produce sealing phenomenon incessantly at low ambient temperatures.
The connection wire sealing structure of high-precision liquid flowmeter provided by the invention, wherein include Sensor section 23 in flowmeter, the case of Sensor section 23 is connected with the adapter sleeve 15 that signal wire passes, the inwall of adapter sleeve 15 is provided with step surface, this step surface is lined with copper sheathing 17, adapter sleeve 15 inwall is fitted with wiring pedestal, and the end face of wiring pedestal is placed on copper sheathing 17, through the copper post 18 having wiring in wiring pedestal; Wiring pedestal is the base of ceramic 16 adopting pottery to make; Adapter sleeve 15, base of ceramic 16, between copper sheathing 17 with copper post 18, arbitrary surface of contact all adopts vacuum brazing mode to be connected.
Wiring with copper post 18 be connected with each signal wire, then through after wiring pedestal, and copper sheathing 17 is padded on the step surface in adapter sleeve 15, then wiring pedestal is placed on this copper sheathing 17.Because pottery is different from stainless steel hot expansion coefficient, base of ceramic 16 and adapter sleeve 15 are by together with Welding, so breaking may appear in pottery when thermal expansion or cold events, therefore need to pad copper sheathing 17 as contraction or expansion transition, hermetically-sealed construction is avoided to destroy, good sealing effectiveness can be formed by isolated between the Sensor section 23 of flowmeter and the external world, thus make the working stability of whole Sensor section 23, the performance of whole flowmeter can be guaranteed; Copper sheathing 17 is as transition, hermetically-sealed construction expands when temperature variation or shrinks and all can not be destroyed, therefore used in flowmeter, its original shape and structure can be kept, therefore under normal temperature and low temperature environment, all good sealing effectiveness can be reached, the phenomenons such as gas leakage can not be there is, guarantee the working stability of Sensor section 23 in whole flowmeter; Adopt the mode of vacuum brazing to weld at the surface of contact place of all parts, can form effective sealing, be completely cut off at the two ends of connecting pipe, and adopt welding manner sealing, sealing is more reliable, can not produce sealing phenomenon incessantly at low ambient temperatures.
As depicted in figs. 1 and 2, the coil fly line structure of high-precision liquid flowmeter of the present invention, the double measuring tube 4 being positioned at Sensor section 23 is included in flowmeter, the two ends of double measuring tube 4 are connected on body 10 inlet and liquid outlet, the middle part of double measuring tube 4 is relative to the cambered outwards lug boss of body 10, the summit place of double measuring tube 4 upper projecting portion is provided with drive coil 3, on double measuring tube 4 lug boss both sides, summit tipping tube in the middle part of be respectively equipped with magnetic test coil 1, the lead-in wire of drive coil 3 and the lead-in wire of magnetic test coil 1 are connected on circuit board 8, circuit board 8 is positioned on the body 10 below lug boss, body 10 is provided with binding post 6, binding post 6 passes from circuit board 8, the lead-in wire of drive coil 3 is bundled on this binding post 6 by dark brown adhesive tape 5.Wherein the outer wall of double measuring tube 4 one end is provided with temperature sensor 9, insulated wire on temperature sensor 9 is wrapped in insulation tube 12, insulation tube 12 is walked spool 11 and is fixed on body 10, and insulated wire is caused circuit board 8 by insulation tube 12, and insulated wire is connected to fly line mode and is connected on circuit board 8.
The two ends of double measuring tube 4 bend relative to middle part, or the middle part convex of double measuring tube 4 forms lug boss, and this lug boss forms the both sides being similar to triangle cast; Coil brace 13 is fixed on double measuring tube 4 equally, the position of drive coil 3 support determines the vibration stimulus position of double measuring tube 4, wherein be provided with coil brace 13 at the summit place of this lug boss, can be used for placing drive coil 3, for the vibration of whole double measuring tube 4 provides power, and be tipping tube in these both sides, summit, the middle part of this tipping tube is installed on coil brace 13, can be used for laying magnetic test coil 1, magnetic test coil 1 needs mounting magnetic steel and magnetic test coil 1, measure phase difference, draws mass rate; Adopt the two-tube susceptibility reducing external shock simultaneously, easily realize the measurement of phase differential.The position of fixed block 14 determines the vibration frequency of double measuring tube 4 vibrations end, therefore fixed block 14 is located at the both sides of bending place, and is welded with double measuring tube 4 by fixed block 14, play the effect at fixing two ends.High-precision liquid flowmeter of the present invention, by the double measuring tube 4 of the thin-walled fixed, double measuring tube 4 resonance or the excitation close to resonance in addition in center.Like this, if measuring section is regarded as two sections that separate from center, so these two sections are just equivalent to rotate back and forth motion around two ends point of fixity respectively.When fluid flows to the other end from one end, just create Coriolis force, make two halves section before and after double measuring tube 4 mid point produce the contrary distortion in direction, and then produce phase differential; Measure phase differential with electromagnetic principle, just calculate the data such as quality, flow, density by transmitter; Wherein the lead-in wire of drive coil 3 and the lead-in wire of magnetic test coil 1 all adopt the mode of fly line to be welded on circuit board 8, lead-in wire effectively can be avoided to be attached on testing tube, can not have influence on measuring accuracy, thus guarantee that whole flowmeter is to CNG measuring accuracy; Meanwhile, the two ends firm welding of lead-in wire, there will not be break-off, improves the job stability of flowmeter.
As shown in Figure 7 to 10, the measuring tube fixed block 14 of high-precision liquid flowmeter provided by the invention, two edge of double measuring tube 4 bend relative in the middle part of it, fixed block 14 is respectively equipped with in the both sides of this bending place, fixed block 14 comprises symmetrical left fixture block 14-1 and right fixture block 14-2, the corresponding sides of left fixture block 14-1 and right fixture block 14-2 are respectively equipped with two arc gap 14-3, distance between two arc gap 14-3 on same fixture block is corresponding with the distance between double measuring tube 4, double measuring tube 4 can be gripped when corresponding sides on left fixture block 14-1 and right fixture block 14-2 are cooperatively interacted.
Owing to have employed said structure, in the Sensor section 23 of high-precision liquid flowmeter, be provided with double measuring tube 4, drive coil 3 is installed at the middle part of double measuring tube 4, can be it and vibration power is provided, both sides in the middle part of this then need to install the Coriolis effect power produced in magnetic test coil 1 pair of measuring tube respectively and detect, the connection of its end is not affected in order to make the middle part of measuring tube that vibration occur, need be protruding by the middle part of measuring tube, therefore one end kink will be there is between the two ends of measuring tube and middle part, therefore measuring tube can change at bending part because of during bending and molding, bending part measuring tube can become the shape of sub-elliptical, on a direction, diameter increases, on a direction, diameter reduces, it is no longer the circle of a standard, (also namely long waist based plate opens two holes according to traditional fixed block 14, the size in hole is the diameter of measuring tube, the centre distance of holes is required measuring tube centre distance, first a pair measuring tube turnover two ends is penetrated in fixed block 14 respectively during installation, and after fixed block 14 is adjusted to required position, fixed block 14 and measuring tube are welded, just play fixation measuring pipe and ensure the effect that measuring tube spacing is equal) be directly placed on the two ends of double measuring tube 4, because the caliber of this bending place there occurs distortion, traditional fixed block 14 cannot pass from this bending place, also namely cannot realize the positioning clamping to double measuring tube 4, the diameter increasing fixed block 14 hole is only had by arc section in order to fixed block 14 can be made, when such fixed block 14 arrives formulation position by arc section, due to measuring tube physical dimension herein and bending end different, this place's measuring tube just has larger gap with the gap of fixed block 14, causes measuring tube to be located inaccurate.Based on the defect of fixed block in prior art 14, fixed block 14 is divided into two by the present invention, adopt knockdown fixed block 14 structure, during assembling locating piece, by the left fixture block 14-1 that is split into two halves and right fixture block 14-2, measuring tube is blocked up and down in desired position, make left fixture block 14-1 and right fixture block 14-2 bonded to each other, the arc gap 14-3 on fixture block is made to aim at measuring tube, again two halves fixture block is integrated by welding, weld with measuring tube again, make to adopt knockdown fixed block 14 in the present invention can install in the optional position of measuring tube, the size of corresponding different fixed block 14 circular arc in positions different on measuring tube, just can control the gap of fixed block 14 and measuring tube on any position, excesssive gap or too small problem can not be caused.
The measuring tube fixed block 14 of high-precision liquid flowmeter provided by the invention, on the limit that left fixture block 14-1 is mutually corresponding with right fixture block 14-2, is provided with the positioning step 14-4 that can cooperatively interact.
Owing to have employed said structure, left fixture block 14-1 and right fixture block 14-2 are provided with the positioning step 14-4 that can cooperatively interact, positioning step 14-4 can enable left fixture block 14-1 and right fixture block 14-2 cooperatively interact, and realizes mutual location; When assembling locating piece, the fixture block be split into two halves is blocked measuring tube up and down in desired position, and by after bonded to each other for positioning step 14-4, two halves locating piece is integrated by welding, weld with measuring tube again, the positioning step 14-4 structure of final structure is more surely leaned on.
The measuring tube fixed block 14 of high-precision liquid flowmeter provided by the invention, the interior arc dia of arc gap 14-3 is greater than the outer diameter of measuring tube.
Owing to have employed said structure, arc gap 14-3 just can be made to block the rear measuring tube optional position of distortion, applied widely, avoid because of after measuring tube distortion, arc notch cannot be stuck on measuring tube.
To sum up, owing to have employed technique scheme, the invention has the beneficial effects as follows:
The two ends of double measuring tube 4 on the one hand can be carried out clamping position, be made keeping parallelism between double measuring tube 4 by the measuring tube fixed block 14 of high-precision liquid flowmeter provided by the invention, and spacedly can not change; The measuring tube fixed block 14 of high-precision liquid flowmeter provided by the invention, in addition on the one hand, measuring tube can change at bending part because of during bending and molding, bending part measuring tube can become the shape of sub-elliptical, it is no longer the circle of a standard, therefore the aperture in this fixed block 14 is adjustable, gripping of optional position on measuring tube can be applicable to, the size of corresponding different fixed block 14 circular arc in therefore different on measuring tube positions, just can control fixed block 14 and the gap of measuring tube on any position, excesssive gap or too small problem can not be caused.
As shown in FIG. 11 and 12, temperature sensor 9 fixed sturcture of high-precision liquid flowmeter provided by the invention, the double measuring tube 4 being positioned at Sensor section 23 is included in flowmeter, the two ends of double measuring tube 4 adopt fixed block 14 clamping position respectively, one end outer wall of double measuring tube 4 is welded with temperature sensor fixed block 19, and temperature sensor fixed block 19 is provided with the jack 20 holding temperature sensor 9.
Owing to have employed said structure, double measuring tube 4 and on drive coil 3, magnetic test coil 1 etc., all the vitals gathering Coriolis effect power, because high-precision liquid flowmeter can be applied in various different operating temperature, its measured value has certain deviation, therefore just needs temperature value as a correction parameter.Gu arrange a temperature sensor 9 in the end of double measuring tube 4 to carry out temperature survey, and be passed to transducer portion 22, therefore how being fixed on measuring tube of temperature sensor 9 needs to solve, temperature sensor 9 is placed on temperature sensor fixed block 19 by the present invention, and this temperature sensor fixed block 19 is welded on measuring tube outer wall, temperature sensor 9 is wherein snapped in jack 20, even if the glue on temperature sensor 9 no longer plays adhesive effect, due to temperature sensor 9 and temperature sensor 9 fixing between closely cooperate, temperature sensor fixed block 19 plays the clamping action to temperature sensor 9, so temperature sensor 9 can not depart from from temperature sensor fixed block 19.Can effectively avoid when the LNG stream body in measuring tube make the temperature on measuring tube be down to subzero more than 100 spend time, the shrinkage factor of bonding agent is different from metal contracts rate, make the stress produced during low-temperature shrink cause sticky face to disconnect, temperature sensor 9 comes off, and causes measurement result to occur deviation.In the present invention, cryogen is passed on temperature sensor 9 by tube wall and temperature sensor fixed block 19 by the LNG stream body in measuring tube, the temperature value that temperature sensor 9 is tested close to the temperature in pipe, thus guarantees measuring accuracy, can effectively avoid occurring deviation.
Temperature sensor 9 fixed sturcture of high-precision liquid flowmeter provided by the invention, a side of temperature sensor fixed block 19 is set to the laminating cambered surface 21 that can match with measuring tube outer wall, the longitudinal direction of temperature sensor fixed block 19 offers the jack 20 holding temperature sensor 9, the size of jack 20 is less than the physical dimension of temperature sensor 9.
Owing to have employed said structure, temperature sensor fixed block 19 1 side is arc surface, can mate completely with measuring tube and fit; The jack 20 of temperature sensor 9 is had in fixed block 14 inside, jack 20 is positioned at when fixed block 14 is fixed on tube wall longitudinally, the physical dimension being dimensioned slightly smaller than temperature sensor 9 of this jack 20, directly can be stuck in temperature sensor 9 and wherein be clamped by temperature sensor 9.Its install operation process is: adopt welding manner after the arc surface of temperature sensor fixed block 19 and measuring tube outer wall being fitted completely, temperature sensor fixed block 19 is fixed on measuring tube; Temperature sensor 9 inserts in temperature sensor fixed block 19 after spreading glue again, temperature sensor 9 and temperature sensor fixed block 19 are bonded firmly.
Temperature sensor 9 fixed sturcture of high-precision liquid flowmeter provided by the invention, jack 20 is small top and big bottom bellmouth in the longitudinal direction of temperature sensor fixed block 19.
Owing to have employed said structure, bellmouth is up big and down small structure, temperature sensor 9 is inserted into from above after in this jack 20 and is clamped, and makes temperature sensor 9 from coming off below it, can not ensure the measuring accuracy in temperature sensor 9 pairs of measuring tubes.
To sum up, owing to have employed technique scheme, the invention has the beneficial effects as follows:
Temperature sensor 9 fixed sturcture of high-precision liquid flowmeter provided by the invention, structure is simple, easy and simple to handle, easy to use, with low cost, is applicable to applying;
Temperature sensor 9 fixed sturcture of high-precision liquid flowmeter provided by the invention, temperature sensor 9 is made to be arranged on the end of double measuring tube 4, record temperature in pipe and prepare the working temperature of reflection flowmeter, this temperature sensor 9 adopts fixed block 14 to be fixed on tube wall, bonding without the need to adopting glue to carry out, temperature sensor 9 effectively can be avoided to depart from from tube wall, make measurement result there will not be deviation, thus guaranteed flow meter steady operation.
As shown in figure 13, the heat absorbing sheet 25 of high-precision liquid flowmeter of the present invention, include transducer portion 22 and Sensor section 23 in flowmeter, the middle part of Sensor section 23 is connected with transducer portion 22 by connecting rod 24, and wherein connecting rod 24 is provided with heat absorbing sheet 25; Heat absorbing sheet 25 is made up of the cylindrical shell be connected on connecting rod 24 and the annular blade be distributed on drum surface.Cylindrical shell and annular blade all adopt aluminum alloy materials to make, and annular leaf and cylindrical shell are an one-piece construction, and the inside of cylindrical shell and connecting rod 24 is provided with the through hole passed through for circuit, and the endoporus of cylindrical shell is connected on connecting rod 24 by interference fit and is fixed.This connecting rod 24 adopts stainless steel material to make simultaneously, and because aluminum alloy heat expansion coefficient is greater than stainless steel hot expansion coefficient, so heat absorbing sheet 25 can tighter 24 armfuls, connecting rod under low temperature environment, heat-transfer effect is better, can not come off.
When LNG is by Sensor section 23, Sensor section 23 temperature sharply declines, low temperature can pass through the gas transfer of connecting rod 24 and sensor internal to transducer portion 22, first connecting rod 24 has certain length transmitter is spatially separated with Sensor section 23, just has partial loss when low temperature transmits; Heat absorbing sheet 25 is large with normal temperature air surface of contact, and according to heat trnasfer principle, heat absorbing sheet 25 absorbs extraneous heat and is transmitted to rapidly connecting rod 24, makes the temperature of connecting rod 24 increase, and such Conduction At Low Temperature, less than transducer portion 22, ensures that transmitter normally works; Under the condition that transmitter can normally work, transmitter and sensor as one, can take up room little, easy for installation.
These are only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a high-precision liquid flowmeter, it is characterized in that, this high-precision liquid flowmeter comprises: Sensor section and transducer portion, described Sensor section comprises the double measuring tube be located in housing, the middle part of described housing is connected with transducer portion line by adapter sleeve, described adapter sleeve is connected with transducer portion, in described adapter sleeve, is provided with seal assembly, the two ends of described double measuring tube bend in the middle part of it respectively relatively, the middle part outwardly convex of described double measuring tube is made to form lug boss, on described double measuring tube, the both sides of bending place is equipped with the fixed block of clamping position, and the summit of described lug boss and the tipping tube of both sides thereof are provided with coil brace, the summit place of described double measuring tube upper projecting portion is provided with drive coil, on described double measuring tube lug boss both sides, summit tipping tube in the middle part of be respectively equipped with magnetic test coil, the lead-in wire of described drive coil and the lead-in wire of magnetic test coil are connected on circuit board, described circuit board is positioned on the body below lug boss, the outer wall of described double measuring tube entrance point is provided with temperature sensor, the lead-in wire of described temperature sensor is wrapped in insulation tube, described insulation tube is walked spool and is fixed on body, insulated wire is caused circuit board by described insulation tube, described insulated wire adopts fly line mode to be connected on circuit board, described drive coil, the lead-in wire of magnetic test coil and temperature sensor enters adapter sleeve and passes seal assembly, be connected on transducer portion simultaneously.
2. high-precision liquid flowmeter as claimed in claim 1, is characterized in that, described double measuring tube is formed between the tipping tube of both sides, lug boss summit the cast angle of a=80 °-100 °; The cast height S=80-130mm on described double measuring tube upper projecting portion summit; Described double measuring tube is made up of the testing tube that two are parallel to each other, the test tube gap T=2-8mm wherein between two testing tubes.
3. high-precision liquid flowmeter as claimed in claim 1, it is characterized in that, the two ends of described double measuring tube are provided with two groups of symmetrical fixed block groups, the bending place that described fixed block is mounted on double measuring tube, by two parallel testing tube clamping positions, is wherein often organized fixed block group and is comprised two fixed blocks.
4. high-precision liquid flowmeter as claimed in claim 1, it is characterized in that, described body is provided with binding post, and described binding post passes from circuit board, and the lead-in wire of described drive coil is bundled on this binding post by dark brown adhesive tape.
5. high-precision liquid flowmeter as claimed in claim 1, it is characterized in that, described seal assembly comprises the base of ceramic be affixed with adapter sleeve inwall, through the copper post having wiring in described base of ceramic, described base of ceramic is butted on the step in adapter sleeve by copper sheathing, any surface of contact between described adapter sleeve, base of ceramic, copper sheathing with copper post all adopts vacuum brazing mode to be connected.
6. high-precision liquid flowmeter as claimed in claim 1, it is characterized in that, described drive coil and magnetic test coil are connected to enameled wire, wherein enameled wire is connected with higher temperature line, the end head of described higher temperature line is fixed in housing cavity by cabling fixed block, and described higher temperature line is wrapped in insulation tube; The lead-in wire of described temperature sensor is wrapped in insulation tube; Higher temperature line is introduced in connecting rod by described insulation tube, described higher temperature line in connecting rod through entering adapter sleeve and being connected to copper post.
7. high-precision liquid flowmeter as claimed in claim 1, it is characterized in that, described fixed block comprises symmetrical left fixture block and right fixture block, the corresponding sides of described left fixture block and right fixture block are respectively equipped with two arc gaps, distance between two arc gaps on same fixture block is corresponding with the distance between double measuring tube, grips double measuring tube when the corresponding sides on described left fixture block and right fixture block are cooperatively interacted.
8. high-precision liquid flowmeter as claimed in claim 7, it is characterized in that, on the limit that described left fixture block is mutually corresponding with right fixture block, be provided with the positioning step cooperatively interacted, the interior arc dia of described arc gap is greater than the outer diameter of single measuring tube in double measuring tube.
9. high-precision liquid flowmeter as claimed in claim 1, it is characterized in that, one end outer wall of described double measuring tube is welded with temperature sensor fixed block, described temperature sensor fixed block is provided with the jack holding temperature sensor, a side of described temperature sensor fixed block is set to the laminating cambered surface matched with measuring tube outer wall, the longitudinal direction of described temperature sensor fixed block offers the jack holding temperature sensor, the size of described jack is less than the physical dimension of temperature sensor, described jack is small top and big bottom bellmouth in the longitudinal direction of temperature sensor fixed block.
10. high-precision liquid flowmeter as claimed in claim 1, it is characterized in that, described Sensor section is connected by connecting rod with between transducer portion, described connecting rod is provided with heat absorbing sheet, described heat absorbing sheet is made up of the cylindrical shell be connected on connecting rod and the annular blade be distributed on drum surface, described cylindrical shell and annular blade all adopt aluminum alloy materials to make, and described cylindrical shell and annular blade are an one-piece construction, and adopt interference fit to be placed on connecting rod by the endoporus of cylindrical shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410577619.9A CN104296815A (en) | 2014-10-24 | 2014-10-24 | High-precision liquid flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410577619.9A CN104296815A (en) | 2014-10-24 | 2014-10-24 | High-precision liquid flow meter |
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| Publication Number | Publication Date |
|---|---|
| CN104296815A true CN104296815A (en) | 2015-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410577619.9A Pending CN104296815A (en) | 2014-10-24 | 2014-10-24 | High-precision liquid flow meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108871481A (en) * | 2018-09-06 | 2018-11-23 | 成都赫泰智能科技有限公司 | A kind of plus hydrogen super-pressure coriolis mass flowmeters |
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| US20060196279A1 (en) * | 2001-09-21 | 2006-09-07 | Endress + Hauser Flowtec Ag | Vibratory transducer |
| CN203657866U (en) * | 2014-01-07 | 2014-06-18 | 成都安迪生测量有限公司 | Measuring pipe structure of Coriolis mass flow meter |
| CN203657865U (en) * | 2014-01-07 | 2014-06-18 | 成都安迪生测量有限公司 | Coriolis mass flow meter |
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Application publication date: 20150121 |