Built metre, method of producing measuring pipe for built metre and application of built metre
FIELD: machine building.
SUBSTANCE: proposed flow metre comprises magnetic-inductive or acoustic transducer with metal measuring pipe fitted into pipeline. Aforesaid pipe inside is lined with organic-plastic (elastomer) comprising polyurethane produced from multi-component system consisting of prepolymer, bivalent alcohol and catalyst containing metal organic (primarily, organotin) compounds. Polyurethane lining comprises organically bound tin.
EFFECT: possibility to make measurements of drinking water.
23 cl, 2 dwg
The invention relates to mortise measuring device, in particular to a flow meter for measuring flow in a pipeline environment, and mortise measuring device contains, in particular, magnetic-inductive measuring transducer placed in the pipeline, lined inside lining of the measuring tube for conducting the medium, and the lining consists of a polyurethane obtained using containing ORGANOMETALLIC compound catalyst. In addition, the invention relates to a manufacturing method called mortise measuring device.
Mortise measuring devices with magnetic-inductive measuring transducer can measure the flow velocity and/or volumetric flow rate of conductive fluid medium flowing through the measuring tube of the measuring transducer in the direction of flow. To do this, in the magnetic-inductive measuring transducer through the greater part diametrically opposite to each other of the field windings of the magnetic circuit, electrically connected to the driving electronic circuit cut-measuring device, create a magnetic field that permeates the environment within a given measurement volume, at least in places perpendicular to the direction of flow and which is locked, in the main, outside the environment. The measuring pipe is therefore usually made of non-ferromagnetic material, so that the magnetic field in the measurement there were no adverse effects. Due to the movement of free charge carriers of the medium in a magnetic field in accordance with the magnetohydrodynamic principle in measuring the amount of generated electric field perpendicular to the magnetic field and perpendicular to the direction of flow of the medium. Through at least two remote from each other in the direction of the electric field of the measuring electrodes and connected through the manufacturing of the electronic circuit mortise measuring device can be measured, therefore, induced in the medium voltage, which, in turn, measure volumetric flow. For removal of the induced voltage can be, for example, wetted plated or not wetted capacitive measuring electrodes. For conducting and writing of the magnetic field in the measuring volume of the magnetic circuit contains usually surrounded by a field coil cores, which are along the periphery of the measuring tube removed from each other, in particular diametrically, and the corresponding free end of the end surface are, in particular, the mirror-symmetricmatrix other. When working magnetic field created is connected to the driving electronic circuit of the field coils is inserted through the cores in the measuring pipe so that it permeates flowing between both end surfaces of the environment, at least in places perpendicular to the direction of flow.
Alternatively, mortise gauges with magnetic-inductive measuring transducers for measuring flow velocity and/or volumetric charges flowing environments often use cut-measuring devices based on acoustic measurement by means of ultrasound.
Due to the required high mechanical stability of such measuring tubes, they are like magnetic-inductive and based on acoustic measurement transducers in most cases, from the outside, in particular metal, the carrier pipe of specified strength and diameter, which is covered inside electronproton insulating material of a specified thickness, the so-called lining. For example, in US-B 6595069, US-A 5664315, US-A 5280727, US-A 4679442, US-A 4253340, US-A 3213685 or JP-Y 53-51181 described magneto-inductive measuring transducers containing hermetically placed in the tubing having a first end with an inlet side and a second end with the outlet side of the measuring tube with the nave is romagnani carrier pipe as the outer shell of the measuring tube and placed in width in the light of the carrier pipe, consisting of an insulating material, a tubular lining for conducting flowing and isolated from the carrier pipe environment.
Usually consisting of thermoplastic, thermosetting or elastomeric lining is used for the chemical isolation of the carrier pipe from the environment. The magnetic-inductive measuring transducers, in which the carrier tube has a high conductivity, for example when using a metal carrier pipe lining serves, moreover, as electrical insulation between the carrier pipe and the environment, prevent short-circuiting of the electric field through the carrier pipe. By an appropriate calculation of the bearing tube is possible, therefore, the coordination strength of the measuring tube with appearing in each case, the mechanical loads, whereas by lining concurrence of the measuring tube with the valid in each case the chemical and/or biological requirements.
Due to its good processing AIDS, on the one hand, and their good chemical and mechanical properties, on the other hand, besides the hard rubber or fluorine-containing plastics, such as PTFE and PFA, particularly, proved also polyurethane as the material of the linings mortise measuring devices, in particular to electromagnetic induction of retelny Converter. In addition, the lining of polyurethane have in most cases a good biological properties, in particular also in bacteriological terms, and, therefore, well suited for use in aqueous environments.
The polyurethanes used for the manufacture of linings described kind are, in most cases, the elastomers obtained on the basis of liquid multicomponent system formed immediately before the processing of the reactive starting components, and the system after mixing is applied on pretreated with adhesion promoter inner wall of the carrier pipe and leave there to cure the lining within the specified response time. Polyurethanes get known method polyaddition of di - and polyisocyanates with two - or more valent alcohols. As initial components can serve at the same time, for example, prepolymers derived from aliphatic and/or aromatic ether groups, a glycol and isocyanate groups which can react with the supplied two - or more valent alcohol.
For the manufacture consisting of polyurethane linings are often used so-called rotational molding, in which a pre-obtained liquid multicomponent system by suitable the overall injection or spray head evenly divided on roaming in a suitable manner to the inner wall of the carrier pipe. Required then for curing the reaction time of a multicomponent system in addition to the dosing of the source components can largely be adjusted through appropriate temperature control processing. However, short reaction time of less than one minute is required for cost-effective manufacture of the lining at a temperature of processing corresponding to approximately room temperature, usually achieved only by adding a multipillar system is suitable, in most cases containing heavy metals and/or amines of the catalyst. As catalysts thus find application especially tertiary amines and/or mercury. Due to the fact that the catalyst remains in the finished polyurethane, mostly unchanged, the latter inevitably has also toxic, at least, but not physiologically quite secure connection. Numerous studies have shown in addition that the catalyst, at least in the presence of water can largely be separated from the linings. In this regard, the presently used in mortise gauges polyurethanes only conditionally suitable for applications with high hygienic requirements, for example for measurements in the field of drinking water, as specified for drinking water for capricasix is, for example by transferring them with her parts high requirements with respect to chemical resistance and physiological compatibility can no longer be performed. Of particular importance in the field of drinking water is given, including compliance with the maximum migration rate (MmaxTOCin regard to the content observances carbon (TOC) and/or specific limit values migration (SML), characteristic of toxicologically critical substances. The same strict requirements to the effects of the linings on the external character of drinking water, particularly in regard to the neutrality of the linings in the presence of water to taste, color, turbidity and/or smell, as well as against the maximum permissible speeds harpagoside (MmaxCl).
The task of the invention consists therefore in creating the mortise measuring device, in particular with magnetic-inductive measuring transducer with oblitsovyvayut its measuring tube lining, which would have good physical, organoleptic and bacteriological properties. In addition, mortise measuring device when using polyurethane as the material of the lining should meet requirements for applications in the field of drinking water high chemical-biological and hygienic requirements.
To address this problem, the invention consists in cutting the measuring device, in particular a flow meter for measuring flowing in the pipeline is Reda, containing, in particular, magnetic-inductive measuring transducer placed in the pipeline, lined inside lining of the measuring tube for conducting medium. Lining cut-measuring device consists of a polyurethane obtained using containing ORGANOMETALLIC compound catalyst, and polyurethane components are chosen so that they are introduced with the catalyst in the lining and the remaining metals have physical and/or chemical, in particular nuclear, communications educated in the lining of the carbon chain. Further, the invention consists in the use of such cut-measuring device for measuring the flow rate and/or flow rate flowing in the pipeline of water, in particular drinking water.
In addition, the invention consists in the method of manufacturing a measuring tube for mortise measuring device. The method includes the step of formation of liquid multicomponent system containing prepolymer, in particular the divalent alcohol and a catalyst, and the catalyst contains educated, in particular physiologically safe metal, ORGANOMETALLIC compounds such as ORGANOTIN compounds. Furthermore, the method includes the steps of applying a liquid multicomponent system at the inner wall, h is the particular metal, serving as an integral part of the measuring pipe carrier pipe and curing multicomponent systems on the inner wall of the carrier pipe for education lining, oblitsovyvaemoy inside the finished measuring pipe.
According to the first variant mortise measuring device, the polyurethane obtained on the basis of a multi-component system formed by prepolymers, in particular the divalent alcohol and a catalyst.
According to the second variant mortise measuring device prepolymer contains, in particular aliphatic, ether group.
Under the third option mortise measuring device prepolymer contains aromatic compounds.
According to the fourth variant mortise measuring apparatus of a catalyst used to produce the polyurethane does not contain amines, so that the lining is free from amines.
According to the fifth variant mortise measuring apparatus of a catalyst used to produce the polyurethane does not contain heavy metals, so that the lining is free from heavy metals.
According to the sixth variant mortise measuring apparatus of a catalyst used to produce the polyurethane contains tin, and the lining contains tin with atomic bond.
According to a seventh variant mortise measuring device fu is arouca has a thickness less than 5 mm, in particular less than 3 mm.
According to the eighth option mortise measuring device, the measuring tube has a nominal diameter less than or equal to 2000 mm
According to the ninth variant mortise measuring device, the measuring tube has a nominal diameter greater than or equal to 100 mm
According to one embodiment, a mortise measuring device measuring transducer contains located on the measuring tube of the magnetic circuit for establishing and maintaining a magnetic field which is induced in the flowing medium electric field, and measuring electrodes for removal induced in the flowing medium voltage.
According to the first variant of the method used, the catalyst contains ORGANOTIN compounds, for example di-n-oscillovasometry.
According to the second variant of the method, the catalyst is a di-n-octanolwater and/or di-n-actualamount.
According to the third variant of the method prepolymer contains, in particular, aliphatic and/or aromatic ether group.
According to the fourth variant of the method prepolymer contains an aromatic or aliphatic isocyanate groups.
According to the fifth variant of the method prepolymer contains at least two reactive NCO-groups.
According to the sixth variant of the method Speer which contains, at least two functional Oh group.
According to a seventh variant of the method, the alcohol is a diol, in particular butanediol.
According to the eighth variant of the method is carried out at a treatment temperature less than 100°C., in particular approximately 25°C.
The basic idea of the invention consists in the use for the manufacture of the lining polyurethane obtained by using the ORGANOMETALLIC, in particular free of amines and/or heavy metals, catalyst. In addition, in the invention it comes to the use of such polyurethane-lining to the part used in the manufacture of the catalyst introduced into the lining of metals, for example due to cross-connections, had physical and/or chemical, in particular nuclear, communications with carbon chains and in this respect were steadfastly and firmly embedded in the lining. Thus, it is possible to guarantee that when working mortise measuring instrument lining, if at all possible, will give the measured environment, only very small amounts of metals or metal compounds in a physiologically safe level. Further, when it is applied to a catalyst physiologically safe light metals, such as tin, may be formed almost "actually safe polyurethane, so that even when the possible separation of metering the emnd environment introduced with catalyst metals or metal compounds can be guaranteed, it will not cause, at least hygienically unacceptable pollution.
The invention and preferred options for its implementation are explained in more detail below using the drawing. The same parts are marked the same reference position. Unless required for clarity, the reference position in the subsequent figures are not available.
In the drawing represent:
figure 1 in perspective when viewed from the side of the measuring tube, in particular for magnetic-inductive, mortise measuring device;
Fig 2 is a longitudinal section of the measuring tube of figure 1.
Figures 1 and 2 in different species shows a measuring tube for measuring Converter mortise measuring device, which serves for measuring flowing in a pipeline (not shown) environment, such as the speed of its flow and/or volume flow. Mortise measuring device may represent, for example, measuring the magnetic-inductive or measuring acoustically-based ultrasound flowmeter. In particular, mortise measuring device is intended for use in drinking water networks.
The measuring tube has, in particular, the metal carrier pipe 2 given width in the light and tube consisting of an insulating material lining 3 of a given diameter. The carrier tube 2 consists of Navarro inanaga material, for example, high-quality stainless steel or other metal, and covers the lining 3 coaxial, so that it is fully stones inside the carrier pipe 2 and in this regard is almost completely isolated from proceeding with the work environment.
The lining 3 is composed of polyurethane, which, for example, a centrifugal method or the so-called rotational molding deposited on the inner wall of the carrier pipe and distributed there as evenly, covering its surface. As the material of the lining 3 can be used, for example, such a polyurethane, which contains aliphatic and/or aromatic ether group.
According to one variant of the invention, the measuring tube is designed for use in cutting the measuring device with magneto-inductive measuring transducer. In accordance with this measuring transducer contains more located on the measuring tube of the magnetic circuit for generating and maintaining a magnetic field which induces in the flowing - here electroconductive medium - voltage, and measuring electrodes for removal induced in the flowing medium voltages. The magnetic circuit usually contains two field coils, which in the measuring mode connected with exciting e-what hemou (not shown) mortise measuring device, serving for generating alternating electrical current of a given force and through which at least temporarily flows through the excitation current. Created due to this magnetic field penetrates flowing within the measuring tube 1 environment, at least in places perpendicular to the direction of its flow. For removal respectively induced in the flowing medium voltage measuring transducer contains placed on the measuring pipe 1 touch device that includes the first 31 and second 32 of the measuring electrodes. They are diametrically opposite to each other, and the virtual connecting the measuring electrode, the diameter of the measuring tube 1 is held perpendicular to its virtual connecting the field coil diameter. Needless to say, the measuring electrodes 31, 32, if necessary, in particular more than two, can be arranged on the measuring tube 1 at a distance from each other that they are not diametrically opposite. This can be, for example, if there are additional measuring electrodes to a reference potential, or embedded in the horizontal position of the measuring tube 1, the measuring electrodes to control the minimum level of protection in it. For a tight space in the pipeline ISM the measuring tube 1 contains the next on the first end of the first flange 4, and on the second end of the second flange 5. The carrier pipe 2 and the flanges 4, 5 have a circular cross-section.
In the manufacture of the measuring tube 1 first, prepare the carrier pipe 2 of the desired length and metal flanges 4, 5. Then on the ends of the carrier tube 2 at its outer side wear of the flanges 4, 5. Then the reverse side of each flange 4, 5 are mechanically firmly and tightly connected to the outer side of the carrier pipe 2. When using a metal carrier pipe and the metal flanges that can occur, for example, by soldering, brazing or welding, giving the corresponding solder or weld bead 6. Formed by the flanges 4, 5 and the carrier pipe 2, the gap can be closed around the sheet, as is common especially in magnetic-inductive measuring transducers. If the measuring tube should be used for magneto-inductive measuring transducer, the interval can be, for example, to accommodate mentioned generating a magnetic field field coils. If the sheet should serve as an integral part of the magnetic circuit, it should be run predominantly ferromagnetic.
As already mentioned, mortise measuring device is, in particular, also for measuring environments, which are subject to more stringent requirements the project in relation to chemical, biological and bacteriological purity, for example drinking water. Therefore, to obtain applied for the coating of polyurethane should abandon containing heavy metals and/or amines of the catalyst, although these types of catalysts because of their good reactivity would be, in fact, it is highly preferred to obtain a polyurethane. On the contrary, mortise measuring device according to the invention, for the manufacture of its lining applied polyurethane formed using containing ORGANOMETALLIC compound catalyst (C). In addition, the polyurethane is selected so that the introduced with the catalyst (C) in the lining and the remaining metals (Me) have a chemical, in particular nuclear, and/or physical, in particular through cross-connections, the connection formed in the lining of the carbon chain. The advantage of this catalyst is that its organo-metallic compound is introduced into the material of the lining so that even under the action of water when working mortise measuring device they are released from the lining, if ever released, in a physiologically safe amounts.
According to one variant embodiment of the invention employed to produce polyurethane catalyst contains ORGANOTIN compounds, in particular di-n-oscillovasometry, so you can guarantee that the initiation is Noah through the catalyst in the finished lining and remaining there tin (Sn) chemically and/or physically to be associated in the lining and thereby, firmly sealed. According to one variant embodiment of the invention for obtaining polyurethane lining 3 use the following ORGANOTIN compound as the catalyst (S):
A particularly preferred catalyst for the manufacture of the lining turned out to be, for example, di-n-octanolwater (DOTL), the structure of which can schematically be represented as follows:
In addition, as catalysts for the manufacture of the lining can be applied, for example, dioctylmaleate or similar ORGANOMETALLIC compound.
According to one variant of the invention, the polyurethane is an elastomer obtained on the basis of multicomponent systems (a+b+C), formed by prepolymer (A), in particular two - or more valent alcohol (B)and catalyst (C). For example, the polyurethane can be an elastomer, which, at least according to the share basically has the following structure:
According to another variant embodiment of the invention used for the manufacture of the lining 3 alcohol (C) is an alcohol with at least two functional IT groups, such as diol. Especially good results is s achieved this through the use of butanediol.
In addition, especially preferred for the manufacture of the lining 3 was the prepolymers (A) with an aromatic or aliphatic isocyanate groups, in particular two or more reactive NCO-groups. According to another preferred variant of the invention, prepolymer, at least on the fraction has the following structural formula:
To obtain such prepolymer, according to one embodiment of the invention, applied polypropyleneoxide, who are forced to react, in particular with excessively added, aromatic diisocyanate.
According to another variant embodiment of the invention as polypropyleneoxide apply polypropylenglycol (BCP), the structure of which in a simplified form can be represented approximately as follows:
Alternatively, or in addition to polypropyleneoxide to get prepolymer can be, for example, polytetramethylene (PTMEG) the following structural formula:
Furthermore, alternatively or in addition, to obtain prepolymer can be used and other aliphatic glycol compounds with polymeric ether groups and end IT groups.
According to the other the WMD variant embodiment of the invention used to produce prepolymer aromatic diisocyanate is diphenylmethanediisocyanate (DHS), in particular, at least one of the following structures:
For the manufacture of the lining, according to one embodiment of the invention, the first liquid through prepolymer (A)alcohol (b) and with the addition of the catalyst (C) form a multi-component system (a+b+C). Basically, more liquid multi-component system (a+b+C), for example, so-called rotational molding, using a roaming inside width in the light of the carrier pipe 2 injection or spray head is then put on the inner wall of the carrier pipe 2. Due to the simultaneous rotation of the carrier pipe 2 around its longitudinal axis and moving the injection or spray head, generally parallel to the longitudinal axis of the liquid multicomponent system (a+b+C) is very simple and well reproducible manner can be evenly distributed over the entire inner wall. Under the action of catalyst deposited on the carrier pipe 2 is here by the rotational casting process is still liquid multicomponent system (a+b+C) is cured, resulting directly on the inner wall of the carrier pipe 2 is formed lining 3. Mainly the concentration and amount of added catalyst (s) is calculated in the same way that printed on the carrier pipe is 2 multi-component system (a+b+C) can be cured within a relatively short reaction time less than one minute, in particular less than 30 seconds, and when the treatment temperature less than 100°C., for example at about 25°C.
Experimental studies have shown that, in particular, in the application described above prepolymer systems (BCP+MDI and/or PTMEG+MDI), such a short response time can be achieved by adding a catalyst (C) with a mass fraction of less than 2% of the total mass of a multicomponent system (a+b+C). Further studies have also shown that particularly good results in the manufacture of the lining 2 are achieved when the alcohol (C) add to prepolymer (A) in the ratio of mixing:about 15:100 or less, in particular less than 10:100.
Thanks to the use of polyurethane as the material of the lining 3 of the measuring tube 1 may be manufactured with conventional passages in the range of 100-2000 mm Exactly the same, in particular with the use of the above described rotational casting process for the manufacture of the lining 3, you can ensure that the lining 3 will have a maximum uniform thickness less than 5 mm, in particular less than 3 mm.
Another advantage of cutting-measuring device according to the invention is that by applying the above-described polyurethane lining 3 he can answer even very high hygienic requirements to the applications to drink the howl of the water, very high, in particular compared with other applications in the field of food products. Studies have shown, for example, that the rate of migration (Mmax, TOCin regard to the content observances carbon (TOC) may be less than 0.25 milligrams per liter per day, whereas in terms of the speed harpagoside (Mmax, Clcould be achieved values less than 0.2 milligram per liter per day. In this regard, mortise measuring device can respond, for example, also the requirements in accordance with the "Directive on hygienic assessment of coatings of epoxy resin in contact with drinking water" to the equipment in the distribution network, in particular also in the main chains and/or in accordance with standard NSF/ANSI Standard 61 for components of the drinking water system.
1. Mortise measuring device, in particular a flow meter for measuring flow in a pipeline containing media, in particular magnetic-inductive or acoustic, the measuring transducer is placed in the pipeline, lined inside lining of the measuring tube for conducting the medium from which the lining is made of polyurethane, which is obtained on the basis of a multi-component system formed by prepolymer, and, in particular, divalent alcohol and a catalyst, and polyurea is, basically, free from heavy metals, while introduced with the catalyst in the lining and the remaining metals are chemical, in particular nuclear, and/or physical connection formed in the lining of the carbon chain, and a polyurethane obtained by the application containing ORGANOMETALLIC compound catalyst containing tin, while the lining contains organically bound tin.
2. The device according to claim 1, characterized in that the polyurethane contains, in particular, aliphatic, ether group.
3. The device according to claim 1, characterized in that the polyurethane contains aromatic compounds.
4. The device according to claim 1, characterized in that the catalyst used to produce the polyurethane contains tin, and the lining contains the associated tin.
5. The device according to claim 1, characterized in that used for the coating of polyurethane, mostly free from amines.
6. Device according to one of claims 1 to 5, characterized in that the lining has a thickness less than 5 mm, in particular less than 3 mm.
7. The device according to claim 1, characterized in that the measuring tube has a nominal diameter less than or equal to 2000 mm
8. The device according to claim 1, characterized in that the measuring tube has a nominal diameter greater than or equal to 100 mm
9. The device according to claim 1, characterized in that the measuring transformed into the l contains located on the measuring tube (1) magnetic circuit for generating and maintaining a magnetic field, inducing in the flowing medium electric field, and the measuring electrodes (31, 32) for removal induced in the flowing medium voltages.
10. The device according to claim 4, characterized in that the polyurethane contains, in particular, aliphatic, ether groups, and/or the polyurethane contains aromatic compounds.
11. The device according to claim 4, characterized in that used for the coating of polyurethane, mostly free from heavy metals and/or used for lining polyurethane, mostly free from amines.
12. The device according to claim 1, characterized in that the lining has a thickness less than 5 mm, in particular less than 3 mm, and/or the measuring tube has a nominal diameter greater than or equal to 100 mm
13. The device according to claim 1, characterized in that the transmitter contains located on the measuring tube (1) magnetic circuit for generating and maintaining a magnetic field, inducing in the flowing medium electric field, and the measuring electrodes (31, 32) for removal induced in the flowing medium voltages.
14. The method of manufacture of the measuring tube to cut-measuring device, in particular mortise measuring device according to one of claims 1 to 13, comprising the following steps: formation of liquid multicomponent system containing prepolymer, the, in particular, the divalent alcohol and a catalyst, and the catalyst contains ORGANOTIN compounds, application of liquid multicomponent system at the inner wall serving as an integral part of the measuring tube, in particular a metal carrier pipe, and curing multicomponent systems on the inner wall of the carrier pipe for education oblitsovyvaemoy inside the finished measuring tube lining.
15. The method according to 14, characterized in that the catalyst contains di-n-oscillovasometry.
16. The method according to item 15, characterized in that the catalyst is a di-n-octanolwater and/or di-n-actualamount.
17. The method according to 14, characterized in that prepolymer contains, in particular, aliphatic and/or aromatic ether group.
18. The method according to one of p-17, characterized in that prepolymer contains an aromatic or aliphatic isocyanate groups.
19. The method according to one of p-17, characterized in that prepolymer contains at least two reactive NCO-groups.
20. The method according to one of p-17, characterized in that the alcohol contains at least two functional Oh group.
21. The method according to claim 20, characterized in that the alcohol is a diol, in particular butanediol.
22. The method according to one of p-17, ha is acteresses fact, that it is carried out at a treatment temperature less than 100°C., in particular about 25°C.
23. The application is made, in particular, the method according to one of PP-22 mortise measuring device according to one of claims 1 to 13 for measuring the flow rate and/or flow rate flowing in the pipeline of water, in particular drinking water.
SUBSTANCE: proposed flow transducer contains a measuring pipe made from dielectric material, on the outer surface of which is mounted a magnetic system in form of two inductance coils. Two electrodes are fitted in the cross section. The pipe is attached through flanges to a metal case on which a terminal box is fitted using a post. Wires run from the coils and electrodes through an opening in one of two terminal pieces, made from dielectric material and heat-resistant material, and an opening in the pole, to the terminal box, where they are soldered on a printed circuit board. The whole volume to the level of the terminal box, including the inner volume of the case, through the opening in the post, is filled with heat-resistant polyurethane foam. The filling material is fully compatible with the insulation of the wire of the coils and lead-out wires. The magnetic system is fixed about the case by a bolt in the opening of the second terminal piece. Earthing rings made from stainless steel are fitted on the flanges with press fitting on the inner diametre. The rings have straight and cone-shaped sections on their outer diametre. Electrode sealing is provided for by cone-shaped projections on the inner surfaces of the electrode head and metallic disc.
EFFECT: reliable operation in a wide range of temperature and pressure.
FIELD: physics, measurement.
SUBSTANCE: electrode of magnetic transformer in flow meter, which provides for generation of alternating magnetic field in fluid flow, contains metal and layer of this metal salt installed between metal and fluid and applied by electrochemical method or by means of sintering. Metal may be represented by silver. In this case layer of salt contains silver haloid salt, which represents silver chloride or fluoride. In version of magnetic transformer layer of metal salt is partially reduced back to metal. Electrode has lower energy of noise at frequencies below 5 Hz compared to electrode containing stainless steel or corrosion-resistant metal alloy.
EFFECT: reduced power consumption.
22 cl, 11 dwg
FIELD: physics, measurement.
SUBSTANCE: magnet-inductive receiver for flow measurement includes metering tube, generator of magnet field having at least two coils, which in measurement mode serve for creation of magnetic field that penetrates the metering tube. Electric circuit connected to coils for monitoring over receiver functioning makes control over magnet field creation possible. In process of control over functioning, at least one of coils serves as generator that creates magnetic field that alternates in time, which penetrates at least the other coil that serves as receiver. Based on received signal induced in receiving coil by means of magnetic field that alternates in time, functioning of flow measurement receiver is monitored.
EFFECT: provision of control even in case conducting medium is not available in metering tube.
10 cl, 10 dwg
FIELD: physics, measurement.
SUBSTANCE: invention may be used for detection of flow of electroconductive liquids contaminated with ferromagnetic particles. Inside metering section of pipeline shedding bar is installed, downstream which sensitive element is installed in the form of two electrodes, signal from which arrives to unit for processing of output signal. At least one of electrodes is inserted inside pipeline metering section and is insulated with bushing. In upper part of pipeline that is closer to the field of electrodes insertion area, outside there are two and more magnets of magnetic system installed with identical poles in direction to longitudinal axis of electrode inserted into metering section, and oriented with their polar axes into point of electrode and pipeline longitudinal axes crossing.
EFFECT: higher reliability of device due to exclusion of electrodes short-circuiting at pipeline wall, has low material intensity.
SUBSTANCE: magnetic circuit represented with two inductance coils is mounted on external surface of measuring tube made of dielectric material with two in-built electrodes. The tube is arranged in iron body which contains framed joint box whereto coil and electrodes wires are delivered through frame cavity. Stainless-steel earth rings are mounted on flanges attaching the measuring tube to the body, being grooved through the external diameter and penetrating the recesses through the internal diameter at end faces of the measuring tube. Flange gasket is provided with trapezoid fluoroplastic ring installed between the flange and the bevelled fit ring. The body interior is filled with silicone foamed polymerised normally. Filling material is good adhesive to the internal surfaces of the body and the measuring tube and completely compatible to isolation of coil winding wire and lead-outs.
EFFECT: reliable flowmeter performance at wide range of temperatures and pressures.
FIELD: physics, measurement.
SUBSTANCE: invention refers to instrument engineering, specifically to electromagnetic flow measurement and can be used for flow measurement in electrically conducting liquid pipelines characterised by complex kinematic flow pattern. Device contains pipe made of nonmagnetic and electrically nonconducting material, magnetic circuit, meter, power supply and sensitive element mounted on the pipe (SE), providing magnetic field excitation in pipe channel and measuring electric field induced in the channel by liquid flow interaction with magnetic field, power supply and meter. Each SE consists of opposite two inductance coils connected on external surface of pipe, and two opposite electrodes arranged in the channel by pipe diameter. The axis of electrodes, axis of coils and channel axis are mutually perpendicular and crossed in channel section centre point. Inductance coils are connected to power supply, while measuring electrodes are connected to meter. Both SE are mounted side by side on pipe, integrated in common magnetic circuit and mutually turned about channel axis at the angle 90 degrees.
EFFECT: higher flowmeter accuracy in flow measurement of complex kinematic flow pattern.
FIELD: physics, measurement.
SUBSTANCE: flow receiver being part of induction magnetic flowmeter, contains electrononconductive measuring pipe mounted on interior adjoining fluid, two electrodes on measuring pipe for evaluation of electric pressure induced in fluid. Flow receiver magnetic field system on measuring pipe includes two saddle pole coils and two pole ferromagnetic pieces designed as saddle-shaped sheet. To control magnetic field surrounding measuring pipe two ferromagnetic reverse action devices shaped as pipe-covering rings mounted up the flow stream and with flow stream from both pole coils are used. Pole pieces are magnetically connected to reverse action devices with ferromagnetic binders each of which has one sulcate protector covering the first or second winding section of proper pole coil. Receiver is compact in effective axial magnetic insulation.
EFFECT: provided high measurement accuracy for pipes of major diameters(350 mm - 600 mm).
12 cl, 8 dwg
FIELD: physics; measurements.
SUBSTANCE: present invention pertains to instrument making, to electromagnetic techniques of measuring flow rate, and can be used for measuring flow rate in pipes with electro-conducting liquids with a complex kinematic flow pattern. The electromagnetic flow meter has pipe, made from non-magnetic and non-electrically conducting material, two electrodes, magnetic core, two induction coils, power supply, a measuring and computing device, the input of which is connected to the electrodes, and an integrating device. The control circuits of the measuring and computing device are connected to the power supply and the integrating device. The flow meter also contains a commutator, the control circuit of which is connected to the measuring and computing device. The commutator has two switching positions for electrical circuits, one of which corresponds to serial connection of the induction coils to the power supply, while the other corresponds to connection of one of the induction coils to the power supply, with the second coil connected to the integrating device.
EFFECT: increased accuracy of measurement.
FIELD: physics; electricity.
SUBSTANCE: electromagnetic flowmeter contains: exciter with iron cored field coil to form magnetic field, perpendicular to external wall of tubular channel; and pair of electrodes for measurement of voltage formed as conducting fluid medium passes through magnetic field. Pair of electrodes and two magnetic poles of exciter are jointly mounted on external wall on side of tubular channel. Electrodes are symmetrically established by sides of one magnetic pole.
EFFECT: higher accuracy of flow rate measurement in tubular channel with ring cross section.
5 cl, 8 dwg
SUBSTANCE: magnetic induction flowmeter contains measuring tube, excitation system, two electrodes of measuring signal, and processing and computing circuit. Within measurement procedure interference component of measuring signal is compensated as pulse interference potential induced by foreign particles or air bubbles. For this purpose measuring signal time variation anomaly is found detecting data group within first stored data set representing digital anomaly. To form interference-free data set corresponding to measurable flow, data of found data group are deleted from first stored data set.
EFFECT: invention eliminates measurement error of various liquids.
25 cl, 13 dwg
FIELD: rubber industry.
SUBSTANCE: invention relates to rubber coverings used for sports grounds and insulation coatings in construction. Composition contains, as base material, 100 wt parts hydroxyl-containing polybutadiene rubber composed of (microstructure): 10-18% cis-1,4, 18-28% trans-1,4, 58-70% 1,2-units with molecular mass 2100 content of hydroxyl groups 0.88-1.36%, or molecular mass 5000-5300 and content of hydroxyl groups 0.6-0.8%; 10-36 wt parts polyisocyanate; and 0.001-3.0 wt parts urethane-formation catalyst. Composition may further contain moisture-absorption component, filler, plasticizer, low-molecular weight alcohol or aminophenol component, alkylphenol antiaging agent, pigment, and rheological property modifier.
EFFECT: improved wear resistance and mechanical properties of coverings.
8 cl, 2 tbl
FIELD: rubber materials.
SUBSTANCE: invention relates to rubber coatings used mainly for sporting platforms, floorings, roofing and insulating coverings. The coating composition comprises the following components, mas. p. p.: hydroxyl-containing copolymer of isoprene and butadiene with the ratio of monomers = 20:80, molecular mass 3000-3500 Da, the content of hydroxyl groups is 0.7-1.1 wt.-%, 100; polyisocyanate, 10-36; catalyst for urethane formation, 0.001-0.3. Coating can comprise additionally a water-absorbing agent, up to 20; a filling agent, up to 250; plasticizer agent and/or solvent, up to 100; low-molecular alcohol or aminophenol component, up to 8; an alkynophenol antiager, up to 2; pigment, up to 10, and components improving rheological properties or organosiloxane modifying agents, up to 5. Proposed composition provides enhancing abrasion resistance and coating structure.
EFFECT: improved and valuable properties of coatings.
9 cl, 2 tbl, 1 ex
FIELD: polymers, in particular resin compositions based on liquid hydrocarbon rubber useful in building industry for manufacturing of roofing and insulating coatings.
SUBSTANCE: claimed composition contains law molecular rubber isoprene-butadiene copolymer in monomer ratio of 20:80, having molecular weight of 3000-3500 and hydroxyl content of 0.7-1.1 mass %; polyisocyanate, waste from polycaproamide production, catalyst for urethane formation. Additionally composition may contain component moisture absorber, filler, plasticizer solvent, law molecular alcohol, antiaging agent pigment and surfactant.
EFFECT: coatings with decreased moisture absorption and increased aging resistance.
2 cl, 2 tbl
FIELD: paint and varnish coatings.
SUBSTANCE: composition comprises a semifinished product of enamel XC-5146 representing pigments and filling agents suspension in solution of partially saponificated copolymer of vinyl chloride with vinyl acetate of brand A-15-0 in mixture of organic solvents, enamel ML-1110 representing pigments suspension in solution of alkyd and melaminoformaldehyde resins and organic solvents with addition of special additives, hardening agent, 40-70% solution of urethane prepolymer with the content of isocyanate groups 8-35% in non-hydroxyl-containing organic solvents. The composition is prepared by pneumospraying method and can be used in preparing decorative coatings showing high exploitation properties.
EFFECT: valuable properties of composition.
SUBSTANCE: high-speed flow of evaporant is produced by centrifugal force created by accelerating channels arranged on the drive axle. Aforesaid channels feature cross section narrowing from axle center to periphery. Accelerating channels can have generatrix arranged along hyperbolas. If accelerating channels are located in turbine wheel, its cross section decreases from the drive axle towards periphery. Coating is effected through narrowing accelerating channels by finely dispersed particles or gases with atomic weight exceeding that of phosphorus. Surface material is selected so that its interatomic distances exceed sizes of atoms or molecules of evaporant.
EFFECT: reduced power consumption and acceleration time interval.
4 cl, 3 dwg
FIELD: technological processes.
SUBSTANCE: method involves putting die into the cavity of the object with provision for a ring shaped gap between the die and the object. The object is immovably installed in a press mould, equipped with an immovable guide rod. Powder of polymer material is filled into the press mould. The die is put in line with the guide rod. The assembled press mould is heated in an oven to temperature of 20-30°C above the melting temperature of the polymer at a rate of 10-15°C/min. The press mould is removed from the oven and the die is loaded with pressure of 15-20 MPa for a period of 10-15 minutes. The product is then cooled together with the press mould at room temperature.
EFFECT: increased strength of joining polymer coating with metallic surface and higher efficiency and accuracy of manufacturing.
4 cl, 1 dwg, 1 tbl