CN101236117A - Eddy current air conditioner coolant linear sensor and its working method - Google Patents
Eddy current air conditioner coolant linear sensor and its working method Download PDFInfo
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- CN101236117A CN101236117A CNA200810020768XA CN200810020768A CN101236117A CN 101236117 A CN101236117 A CN 101236117A CN A200810020768X A CNA200810020768X A CN A200810020768XA CN 200810020768 A CN200810020768 A CN 200810020768A CN 101236117 A CN101236117 A CN 101236117A
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Abstract
The invention discloses a liner transducer of cooling medium of an eddy current air conditioner, which comprises a signal detecting and processing circuit, a magnet inductance coil, an elastic element, a packing shell for connecting and a cooling medium lead-in valve, wherein the signal detecting and processing circuit includes an integrated circuit plate and a peripheral circuit thereof which is employed to receive external signals, shows an oscillation excitation to a inductance coil, conversing a detected voltage signal of the inductance coil to a direct current voltage signal with good linearity for outputting, and preventing external disturbance, the magnet inductance coil comprises the inductance coil and a semi-closed magnet ring skeleton thereof, the elastic element is provided with the cooling medium lead-in valve, and a sensitive element and an external pressure input element are integrated by employing welding procedure. The liner transducer of cooling medium of an eddy current air condition is capable of playing a part in pressure measuring of a car air condition, thereby enlarging the field of appliance, further improving aspects of elastic element materials, the manufacturing technique, the magnet inductance process structure, the integrated circuit, the overall connecting and packing process.
Description
Affiliated field the invention belongs to the sensor application field, particularly is used for tonometric eddy current air conditioner coolant linear sensor of air conditioning for automobiles refrigerant and method of work thereof.
It mainly is resistance-type and condenser type that the domestic present production of technical background is used for the tonometric sensor of air conditioning for automobiles.This two sensor is mature on the whole on technology, technology, but do not overcome own defective own: the flexible member of resistive pressure sensor can only be the less aluminium alloy of elastic modulus, can only be from the machining precision of flexible member, the manufacture craft of diaphragm and the measuring accuracy that paster technique improves sensor, but the degree that promotes is limited; The volume of capacitance type sensor is little, simple in structure, highly sensitive, but the scope of measuring is little, the influence that measured value is subjected to medium and electromagnetic field is bigger, use at the scene and also have any problem, can not satisfy all therefore in the actual use that rugged environment is guaranteed performance demands such as precision, q﹠r down.
Current vortex sensor (eddy electric sensor is called for short ECS).Advantages such as it can become parameter transformations such as displacement, amplitude, thickness, size, crackles electric weight to measure, and it is big to have the measure linear scope, and is simple in structure, is not subjected to the influence of media such as greasy dirt, and frequency response is wide, and antijamming capability is strong.It is maximum that current vortex sensor is used is two aspects: the one, be used for testing meter and instrument, and be used for the monitoring and protecting system besides.External radial vibration measurement and the axial displacement that has been used for turning axles such as steam turbine, air compressor is measured, and as the continuous monitoring device.Domestic eddy current displacement vibration amplitude measuring instrument and power plant steam turbine supervision displacement meter, the eccentricity gauge etc. succeeded in developing.
At present, producing the more country of ECS is countries such as U.S., day, moral, English.Northwestern Polytechnical University has succeeded in developing novel eddy-current sensor, makes it both keep the advantage of eddy current sensor, surpasses capacitive transducer again from far away at aspects such as sensitivity, signal to noise ratio (S/N ratio), temperature stabilities.
Southeast China University succeeds in developing SE series current vortex sensor.This transducer series adopts multiple electronic surveying, calculate and the transmission new and high technology, by probe, departments such as computer form, probe diameter has 8,11,18 plurality of specifications, be applicable to rotary mechanical shaft vibration, axial displacement, eccentric, it is poor to expand, rotating speed, orbit of shaft center, surface irregularity, corner, physical quantity such as differential is carried out on-line monitoring, also can be used for the grinding machine precision positioning, the material thickness measure of non-conductive village, the hardware counting, it and the supporting use of TG supervisory instrumentation, can monitor turbodynamo duty and measuring vibrations, temperature, tens of kinds of parameters such as rotating speed, its key technical indexes reach external like product level.
The current vortex sensor that has only seam gunnysack the eye of a needle size that rice iridium company Development and Production goes out deserves to be called the minimum in the whole world, and it can be embedded in realizes in the various engines that machine is automatically-monitored, is called as the most vital product of 21 century, and prospect is tempting.And rice iridium series current vortex displacement device, it also is the first in the world that three big characteristics are wherein arranged:
A. linear precision 0.2% (other manufacturers are generally 1%)
B. frequency band is up to 100KHZ (other manufacturers be generally 10,20KHZ)
C. frequency of operation synchronous (avoiding adjacent interference between the sensor, unique) is decided by the dimension control field that enters of its success owing to a rice iridium eddy current displacement sensor high precision between the sensor; It can be used for high response band decision measuring up to 400,000 compressor rotary speeds that change; Net synchronization capability decision it can success the trajectory measurement that is used for minimum axle, part non-roundness measurement or the like.Therefore rice iridium eddy current displacement sensor deserves to be called the most accurate displacement transducer in the whole world.
The air conditioning for automobiles pressure transducer that is used for that American TI Company is produced is a ceramic capacitor-type.
Italy has produced and has applied to the tonometric current vortex sensor of air conditioning for automobiles, and is applied to its national automobile industry.
The pressure transducer that is used for air-conditioning of domestic production at present mainly is resistance-type and condenser type, and the current vortex sensor of production is mainly used the clearance measurement of amplitude, turning axle etc., but also is not applied to the tonometric field of air conditioning for automobiles refrigerant.
Summary of the invention purpose of the present invention mainly be at the tonometric sensor-resistance-type of present air conditioning for automobiles refrigerant and condenser type-defective, utilize the advantage of current vortex sensor, use for reference domestic and international Related product and achievement in research, propose a kind of brand-new metering system about current vortex sensor, air conditioning for automobiles pressure transducer.And material, manufacture craft at flexible member, the magnet skeleton structure of electromagnetism inductance, coil around referring to technology, the aspects such as last packaging technology of integrated treatment circuit and product have proposed some viewpoints, make current vortex sensor obtain demonstration in theory in the air conditioning for automobiles force applications, this product has good market outlook.
Technical scheme of the present invention is: eddy current air conditioner coolant linear sensor, comprise that the signal output, input treatment circuit, electromagnetism telefault, flexible member, assembling package casing, the refrigerant that place shell to connect successively import valve, particularly:
Be equipped with the signal output of parcel contact pin above the input treatment circuit, adopt contact pin to carry out the input and output of signal, adopt an above soldered joint welding electromagnetism telefault below the input treatment circuit, make the fidelity of signal transmission between electromagnetism telefault and the input treatment circuit and the impedance and the whole input treatment circuit coupling of joint, the input treatment circuit comprises integrated circuit block and peripheral circuit, peripheral circuit is a telefault, resistance and electric capacity, electric capacity comprises first electric capacity, second electric capacity, the 3rd electric capacity, the 4th electric capacity, the telefault and first capacitances in series and and the internal circuit of integrated circuit block by the oscillating circuit that is electrically connected to form of the 6th pin on it, produce sinusoidal oscillator signal, make the telefault concussion, produce induction electromotive force E
0Second electric capacity places on the 6th pin and the connecting circuit between the telefault of integrated circuit block, the internal circuit that is used for leaching integrated circuit block is sent the clutter of sinusoidal signal, resistance is connected on the 5th pin and the connecting circuit between the 3rd electric capacity of integrated circuit block, be used to regulate the amplitude of sinusoidal signal to satisfy measurement requirement, the 3rd electric capacity one end ground connection, the other end is connected on the connecting circuit between the resistance and first electric capacity, be used for the interference of filtering ground connection, it is the 3.3V direct supply that the 4th electric capacity one end connects voltage, other end ground connection is used for filter out power and disturbs, and guarantees the degree of purity of the internal circuit power supply signal of integrated circuit block;
The function of integrated circuit block is to accept external signal, give telefault a concussion excitation, record the voltage signal of coil and be translated into linearity d. c. voltage signal output preferably, integrated circuit block has eight pins, be distributed in the both sides of integrated circuit block, wherein first pin is the voltage signal input pin, connect the direct supply that voltage is 3.3V, for the internal circuit of integrated circuit block provides the required voltage signal, second pin and three-prong are the output pin OUT of signal, the internal circuit processing of the signal process integrated circuit block that metering circuit records is converted into voltage and unites output by pin and pin, the 4th pin is a ground connection GND pin, negative pole as integrated circuit block, the 5th pin connecting resistance, the 6th pin connects second electric capacity, and the 7th pin and the 8th pin are unsettled, the 6th pin, second electric capacity, telefault, first electric capacity, resistance, the 5th pin is formed the carrier wave AM electric vortex sensing element of constant frequency;
The electromagnetism telefault is made of semiclosed magnetic ring body and telefault, adopt the skeleton of semiclosed magnetic ring body as telefault, on the electromagnetism telefault, be equipped with the input treatment circuit and adopt the annular element mechanical connection with following flexible member, guarantee fixing, the right alignment of both relative positions of assembling back and the depth of parallelism of end face, the telefault in the electromagnetism telefault and first electric capacity produce concussion under the sinusoidal excitation effect of the inside of integrated circuit block, produce induction electromotive force E in the telefault
0, the flexible sheet of the diaphragm element on the concussion effect flexible member of telefault produces current vortex in flexible sheet, flexible sheet generation elastic deformation, induction electromotive force E
0Induction electromotive force E with the formation of current vortex retroaction telefault
1Difference DELTA E=E
0-E
1It promptly is the voltage change that to measure;
Flexible member comprises that refrigerant imports valve, diaphragm element, welding technology band and external pressure input component, wherein diaphragm element and external pressure input component are structure as a whole by welding technology band mechanical connection, flexible sheet on the diaphragm element is accepted refrigerant pressure on the one hand and is produced elastic deformation, under the effect of electromagnetism telefault concussion, produce current vortex on the one hand, be equipped with refrigerant in the external pressure input component and import valve, adopt centrosymmetric slit guiding refrigerant to arrive the stressed acting surface of the flexible sheet on the diaphragm element, air conditioner coolant imports on the valve uniform and centrosymmetric slit more than, play resistance-type or capacitive aperture effect, guiding refrigerant arrives the stressed acting surface of the flexible sheet on the diaphragm element, and refrigerant pressure evenly is applied on the flexible sheet of diaphragm element, make its deformation evenly and can influence the variation of the induction electromotive force of telefault in the electromagnetism telefault uniformly;
Shell is that the assembling package casing positions encapsulation to eddy current air conditioner coolant linear sensor; play sealing and anti-interference protective effect; signal output, input treatment circuit, electromagnetism telefault, flexible member interconnects and stationkeeping after be one with its mechanical encapsulation, adopt hexagon that assembling package casing and external pressure input component are positioned.
As a further improvement of existing technologies, the distance≤0.5mm between electromagnetism telefault and the flexible member can extrapolate the parameter of telefault, and is according to the coiling telefault with this parameter, and the cross sectional shape of electromagnetism telefault L is a rectangle;
External pressure input component is mid-to have air conditioner coolant to import valve, air conditioner coolant imports on the valve that uniform slit is 3～5 more than one, uniform slit is the plastic valve structural member, guiding refrigerant arrives the stressed acting surface of the flexible sheet of the diaphragm element in the flexible member, guarantees that flexible member under stepless action power elastic deformation takes place;
Adopt two weldering end connector welding electromagnetism telefaults below the input treatment circuit;
The material of flexible member and external pressure input component is stainless steel;
A kind of method of work of using eddy current air conditioner coolant linear sensor, particularly: when eddy current air conditioner coolant linear sensor is worked, power connection, power supply signal detects treatment circuit by the first pin entering signal of power pin in the signal output and the integrated circuit block in the input treatment circuit, and clutter is by the 4th electric capacity filtering in the signal;
Sinusoidal current in the integrated circuit block is by the 6th pin and the telefault in the electromagnetism telefault and first capacitances in series formation oscillating circuit of integrated circuit block, the effect of telefault earthquake circuit produces induction electromotive force E0 down, produces current vortex on the flexible sheet of the diaphragm element in flexible member;
Air conditioner coolant enters external pressure input component, import valve through the refrigerant plastics, arrive the stress surface of the flexible sheet of the diaphragm element in the flexible member, flexible sheet produces elastic deformation δ under the effect of air conditioner coolant pressure P, cause between the end face of the flexible sheet of the diaphragm element in the flexible member and electromagnetism telefault apart from the d Δ d that changes;
Current vortex in the flexible sheet reacts on telefault, produces induction electromotive force E in telefault
1, metering circuit records the changes delta E=E of induction electromotive force in the telefault
0-E
1, be converted into voltage and unite output through the processing of treatment circuit in the integrated circuit block by second pin and three-prong, externally export by the output contact pin of signal output.
The invention has the beneficial effects as follows: with respect to existing product, principle of work of the present invention is by the crystal oscillator high-frequency signal that a frequency stabilization is provided between the 5th pin in the integrated circuit block and the 6th pin, excitation telefault and electric capacity are formed the shunt circuit, when the natural frequency of shunt circuit equals the high-frequency signal frequency of oscillator, the voltage U maximum of output, and be made as U
MAXAnd when measuring, that is measured body is when moving with respect to eddy current air conditioner coolant linear sensor, the frequency that is produced by oscillator is that the voltage of f is added to two ends, shunt circuit and output, when measured body and eddy current air conditioner coolant linear sensor asked relative displacement the time, eddy current air conditioner coolant linear sensor will change the impedance of constant frequency, thereby the equiva lent impedance Z of shunt circuit is changed, cause the variation of output voltage U, at this moment the frequency of carrier wave still remains unchanged, but variation has taken place in amplitude, the eddy current air conditioner coolant linear sensor equiva lent impedance changes, the shunt circuit off resonance, output voltage changes thereupon, and the measuring system of the present invention in the design adopts the excitation frequency of 3MHz;
The function of integrated circuit block is to accept external signal, give telefault a concussion excitation, record the voltage signal of coil and be translated into linearity d. c. voltage signal output preferably, wherein the 6th pin, second electric capacity, telefault, first electric capacity, resistance, the 5th pin are formed the carrier wave AM electric vortex sensing element of constant frequency;
The electromagnetism telefault is made of semiclosed magnetic ring body and telefault, adopt the skeleton of semiclosed magnetic ring body as telefault, on the electromagnetism telefault, be equipped with the input treatment circuit and adopt the annular element mechanical connection with following flexible member, guarantee fixing, the right alignment of both relative positions of assembling back and the depth of parallelism of end face, the telefault in the electromagnetism telefault and first electric capacity produce concussion under the sinusoidal excitation effect of the inside of integrated circuit block, produce induction electromotive force E in the telefault
0, the flexible sheet of the diaphragm element on the concussion effect flexible member of telefault produces current vortex in flexible sheet, flexible sheet generation elastic deformation, induction electromotive force E
0Induction electromotive force E with the formation of current vortex retroaction telefault
1Difference DELTA E=E
0-E
1It promptly is the voltage change that to measure;
Flexible member comprises that refrigerant imports valve, diaphragm element, welding technology band and external pressure input component, wherein diaphragm element and external pressure input component are structure as a whole by welding technology band mechanical connection, flexible sheet on the diaphragm element is accepted refrigerant pressure on the one hand and is produced elastic deformation, under the effect of electromagnetism telefault concussion, produce current vortex on the one hand, be equipped with refrigerant in the external pressure input component and import valve, adopt centrosymmetric slit guiding refrigerant to arrive the stressed acting surface of the flexible sheet on the diaphragm element, air conditioner coolant imports on the valve 3～5 uniform and centrosymmetric slits, play resistance-type or capacitive aperture effect, guiding refrigerant arrives the stressed acting surface of the flexible sheet on the diaphragm element, and refrigerant pressure evenly is applied on the flexible sheet of diaphragm element, make its deformation evenly and can influence the variation of the induction electromotive force of telefault in the electromagnetism telefault uniformly;
Shell is that the assembling package casing positions encapsulation to eddy current air conditioner coolant linear sensor; play sealing and anti-interference protective effect; signal output, input treatment circuit, electromagnetism telefault, flexible member interconnects and stationkeeping after be one with its mechanical encapsulation, adopt hexagon that assembling package casing and external pressure input component are positioned.
The present invention can not only make eddy current air conditioner coolant linear sensor play a role in the air conditioning for automobiles pressure survey, enlarge its application, the more important thing is from flexible member material, manufacturing process, electromagnetism inductance process structure, integrated circuit and the whole packaging technology aspect that is connected and make progress.Eddy current air conditioner coolant linear sensor is in the application in air conditioning for automobiles pressure survey field, the performance of air conditioning for automobiles will be improved greatly, improve the quality of air-conditioning, satisfy the requirement of people, improved people's quality of life the environment inside car comfort level to stress reaction.
Description of drawings:
Fig. 1 is an one-piece construction schematic diagram of the present invention.
Fig. 2 is the flexible member synoptic diagram.
Fig. 3 is that refrigerant imports the valve synoptic diagram.
Fig. 4 is an electromagnetism telefault synoptic diagram.
Fig. 5 is input treatment circuit figure.
Embodiment is further described the specific embodiment of the present invention below in conjunction with figure:
Fig. 1 is an one-piece construction schematic diagram of the present invention.Mainly comprise: signal output 1; Input treatment circuit 2; Electromagnetism telefault 3; Flexible member 4; Equipment package casing 5; Refrigerant imports valve 6.The expectation index that current vortex sensor will reach is:
Supply voltage: 5V ± 10%
Supply current: 7.0mA (Max)
Working temperature :-5～100 ℃
Output load: 61K Ω (fluctuation range is in ± 5%)
Elastic displacement: 10 ± 5Nm
The entire length of product :≤52mm
When current vortex sensor is worked, power connection, power supply signal detects treatment circuit 2 by the first pin one entering signal of power pin in the signal output 1 and the integrated circuit block U1 in the input treatment circuit 2, clutter is by 3 filterings of the 4th capacitor C in the signal, and the sinusoidal current of integrated circuit block U1 inside is by the 6th pin 6 of integrated circuit block U1 and the telefault L and first capacitor C in the electromagnetism telefault 3
0Series connection constitutes oscillating circuit, and the effect of telefault L earthquake circuit produces induction electromotive force E down
0And produce current vortex on the flexible sheet of the diaphragm element in flexible member 47, air conditioner coolant enters external pressure input component 9, import valve 6 through the refrigerant plastics, arrive the stress surface of the flexible sheet of the diaphragm element 7 in the flexible member 4, flexible sheet produces elastic deformation δ under the effect of air conditioner coolant pressure P, cause between the end face of the flexible sheet of the diaphragm element 7 in the flexible member 4 and electromagnetism telefault 3 apart from the d Δ d that changes, current vortex in the flexible sheet reacts on telefault L, produces induction electromotive force E in telefault
1, metering circuit records the changes delta E=E of induction electromotive force among the telefault L
0-E
1, be converted into voltage and unite output through the processing of integrated circuit block U1 inter-process circuit by second pin two and three-prong 3, externally export by the output contact pin of signal output 1.
Fig. 2 is the flexible member synoptic diagram, is made up of refrigerant importing valve 6, diaphragm element 7, external pressure entrance spare 9.Refrigerant imports the inside that valve 6 places external pressure entrance spare 9.The material of diaphragm element 7 and external pressure entrance spare 9 is stainless steel, adopts welding technology to connect, and the welding technology band is 8.
Fig. 3 is that refrigerant imports the valve synoptic diagram, refrigerant imports on the valve 3～5 uniform slits, play resistance-type or capacitive aperture effect, guiding refrigerant arrives the stressed acting surface of the flexible sheet on the diaphragm element 7, and refrigerant pressure evenly is applied on the flexible sheet of diaphragm element 7, make its deformation even.
Fig. 4 is an electromagnetism telefault synoptic diagram.Telefault L coiling is installed on the semiclosed magnet ring 10.The physical dimension of current vortex ring is: the radial thickness C=0.865R of ring
b, half r in the ring
1=0.525R
b, the external radius r of ring
0=1.39R
b, R wherein
bExternal diameter for cell winding.The present invention be directed to stroke pressure detection in a small amount, therefore adopt the little coil of external diameter to improve sensitivity.Initial distance d=0.2mm in the technical scheme between flexible member and the telefault L, telefault L cross sectional shape is a rectangle, can extrapolate the parameter of telefault L thus.With this parameter serves as according to programming in telefault L coiling.The skeleton of telefault L adopts the magnetic structure of semiclosed magnet ring, and this structure can well prevent that magnetic from revealing, the shielding external disturbance.Telefault L is done some auxiliary process be installed on the magnet skeleton, measure and revise special electromagnetism induction structure of the last formation of its characteristic.
Fig. 5 is input treatment circuit figure.The present invention adopts and decides the frequency modulation circuit, is made up of electronic circuits such as vibration, detection, filtering and amplifications.
Be equipped with the signal output 1 of parcel contact pin above the input treatment circuit 2, adopt contact pin to carry out the input and output of signal, adopt two soldered joint welding telefault L below the input treatment circuit 2, make the fidelity of signal transmission between telefault L and the input treatment circuit 2 and the impedance and whole input treatment circuit 2 couplings of joint, input treatment circuit 2 comprises integrated circuit block U1 and peripheral circuit thereof, peripheral circuit is telefault L, resistance R and capacitor C, capacitor C comprises first capacitor C 0, second capacitor C 1, the 3rd capacitor C 2, the 4th capacitor C 3, telefault L connects with first capacitor C 0 also and the internal circuit of integrated circuit block U1 connects and composes oscillating circuit by the 6th pin 6 on it, produce sinusoidal oscillator signal, make electromagnetism telefault L concussion, produce induction electromotive force, capacitor C 1 places on the 6th pin 6 and the connecting circuit between the electromagnetism telefault L of integrated circuit block U1, be used for leaching the clutter of the sinusoidal signal that integrated circuit block U1 internal circuit sends, resistance R is connected on the 5th pin 5 and the connecting circuit between first capacitor C 0 of integrated circuit block U1, be used to regulate the amplitude of sinusoidal signal, to satisfy measurement requirement, the 3rd capacitor C 2 one end ground connection, the other end is connected on the connecting circuit between the resistance R and first capacitor C 0, be used for the interference of filtering ground connection, it is the 3.3V direct supply that the 4th capacitor C 3 one ends connect voltage, other end ground connection, be used for filter out power and disturb, guarantee the degree of purity of the power supply signal of integrated circuit block U1 internal circuit;
The function of integrated circuit block U1 is to accept external signal, give telefault L a concussion excitation, record the voltage signal of coil and be translated into linearity d. c. voltage signal output preferably, integrated circuit block U1 has eight pins, be distributed in the both sides of integrated circuit block U1, wherein first pin one is the voltage signal input pin, connect the direct supply that voltage is 3.3V, for integrated circuit block U1 internal circuit provides the required voltage signal, second pin two and three-prong 3 are the output pin OUT of signal, the signal process integrated circuit block U1 internal circuit processing that metering circuit records is converted into voltage and unites output by pin two and pin 3, the 4th pin 4 is a ground connection GND pin, as the negative pole of integrated circuit block U1, and the 5th pin 5 connecting resistance R, the 6th pin connect second capacitor C, 1, the seven pin 7 and the 8th pin 8 unsettled;
The 6th pin 6, second capacitor C 1, telefault L, first capacitor C 0, resistance R, the 5th pin 5 are formed the carrier wave AM electric vortex sensing element of constant frequency, its principle of work is by providing high-frequency signal (crystal oscillator), stimulus sensor coil L and the shunt capacitance C of a frequency stabilization to form the LC shunt circuit between the 5th pin 5 and the 6th pin 6 pin, when the natural frequency in loop equals the high-frequency signal frequency of oscillator, the voltage U maximum of output, and be made as U
MAXAnd when measuring, that is measured body is when moving with respect to eddy current air conditioner coolant linear sensor, the frequency that is produced by oscillator is that the voltage of f is added to two ends, LC shunt circuit, in the output of the two ends of LC shunt circuit, when measured body and eddy current air conditioner coolant linear sensor asked relative displacement the time, eddy current air conditioner coolant linear sensor will change the impedance of constant frequency, thereby the equiva lent impedance Z of LC shunt circuit is changed, thereby cause the variation of output voltage U, at this moment the frequency of carrier wave still remains unchanged, but variation has taken place in amplitude, and the eddy current air conditioner coolant linear sensor equiva lent impedance changes, the loop off resonance, output voltage changes thereupon, and measuring system adopts the excitation frequency of 3MHz in the design.
Obviously, those skilled in the art can be to material, design and the manufacture craft of eddy current air conditioner coolant linear sensor of the present invention and method of work and element thereof, carries out various changes and modification and does not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (6)
1, a kind of eddy current air conditioner coolant linear sensor, comprise that the signal output (1), input treatment circuit (2), electromagnetism telefault (3), flexible member (4), assembling package casing (5), the refrigerant that place shell to connect successively import valve (6), is characterized in that:
Be equipped with the signal output (1) of parcel contact pin above the described input treatment circuit (2), adopt contact pin to carry out the input and output of signal, adopt an above soldered joint welding electromagnetism telefault (3) below the described input treatment circuit (2), make the fidelity of signal transmission between electromagnetism telefault (3) and the input treatment circuit (2) and the impedance and whole input treatment circuit (2) coupling of joint, described input treatment circuit (2) comprises integrated circuit block (U1) and peripheral circuit thereof, described peripheral circuit is telefault (L), resistance (R) and electric capacity (C), described electric capacity (C) comprises first electric capacity (C0), second electric capacity (C1), the 3rd electric capacity (C2), the 4th electric capacity (C3), described telefault (L) connect with first electric capacity (C0) and and the internal circuit of integrated circuit block (U1) by the oscillating circuit that is electrically connected to form of the 6th pin (6) on it, produce sinusoidal oscillator signal, make telefault (L) concussion, produce induction electromotive force E
0Described second electric capacity (C1) places on the 6th pin (6) and the connecting circuit between the telefault (L) of integrated circuit block (U1), be used for leaching the clutter of the sinusoidal signal that integrated circuit block (U1) internal circuit sends, described resistance (R) is connected on the 5th pin (5) and the connecting circuit between the 3rd electric capacity (C2) of integrated circuit block (U1), be used to regulate the amplitude of sinusoidal signal to satisfy measurement requirement, described the 3rd electric capacity (C2) end ground connection, the other end is connected on the connecting circuit between resistance (R) and first electric capacity (C0), be used for the interference of filtering ground connection, it is the 3.3V direct supply that described the 4th electric capacity (C3) end connects voltage, other end ground connection, be used for filter out power and disturb, guarantee the degree of purity of the power supply signal of integrated circuit block (U1) internal circuit;
The function of described integrated circuit block (U1) is to accept external signal, give telefault (L) a concussion excitation, record the voltage signal of coil and be translated into linearity d. c. voltage signal output preferably, described integrated circuit block (U1) has eight pins, be distributed in the both sides of integrated circuit block (U1), wherein first pin (1) is the voltage signal input pin, connect the direct supply that voltage is 3.3V, for integrated circuit block (U1) internal circuit provides the required voltage signal, second pin (2) and three-prong (3) are the output pin OUT of signal, signal process integrated circuit block (U1) the internal circuit processing that metering circuit records is converted into voltage and unites output by pin (2) and pin (3), the 4th pin (4) is a ground connection GND pin, negative pole as integrated circuit block (U1), the 5th pin (5) connecting resistance (R), the 6th pin (6) connects second electric capacity (C1), the 7th pin (7) and the 8th pin (8) are unsettled, the 6th pin (6), second electric capacity (C1), telefault (L), first electric capacity (C0), resistance (R), the 5th pin (5) is formed the carrier wave AM electric vortex sensing element of constant frequency;
Described electromagnetism telefault (3) is made of semiclosed magnetic ring body (10) and telefault (L), adopt the skeleton of semiclosed magnetic ring body (10) as telefault (L), on described electromagnetism telefault (3), be equipped with input treatment circuit (2) and adopt the annular element mechanical connection with following flexible member (4), guarantee the fixing of both relative positions of assembling back, the depth of parallelism of right alignment and end face, telefault (L) in the described electromagnetism telefault (3) produces concussion with first electric capacity (C0) under the effect of the inner sinusoidal excitation of integrated circuit block (U1), produce induction electromotive force E in the telefault (L)
0, the flexible sheet of the diaphragm element (7) on the concussion effect flexible member (4) of telefault (L) produces current vortex in flexible sheet, flexible sheet generation elastic deformation, induction electromotive force E
0Induction electromotive force E with current vortex retroaction telefault (L) formation
1Difference DELTA E=E
0-E
1It promptly is the voltage change that to measure;
Described flexible member (4) comprises that refrigerant imports valve (6), diaphragm element (7), welding technology band (8) and external pressure input component (9), wherein diaphragm element (7) and external pressure input component (9) are structure as a whole by welding technology band (8) mechanical connection, flexible sheet on the described diaphragm element (7) is accepted refrigerant pressure on the one hand and is produced elastic deformation, under the effect of electromagnetism telefault (L) concussion, produce current vortex on the one hand, be equipped with refrigerant in the described external pressure input component (9) and import valve (6), adopt centrosymmetric slit guiding refrigerant to arrive the stressed acting surface of the flexible sheet on the diaphragm element (7), air conditioner coolant imports on the valve (6) uniform and centrosymmetric slit more than, play resistance-type or capacitive aperture effect, guiding refrigerant arrives the stressed acting surface of the flexible sheet on the diaphragm element (7), and refrigerant pressure evenly is applied on the flexible sheet of diaphragm element (7), make its deformation evenly and can influence the variation of the induction electromotive force of telefault (L) in the electromagnetism telefault (3) uniformly;
Described shell is that assembling package casing (5) positions encapsulation to eddy current air conditioner coolant linear sensor; play sealing and anti-interference protective effect; signal output (1), input treatment circuit (2), electromagnetism telefault (3), flexible member (4) interconnect and stationkeeping after be one with its mechanical encapsulation, adopt hexagon that assembling package casing (5) and external pressure input component (9) are positioned.
2, a kind of eddy current air conditioner coolant linear sensor according to claim 1, it is characterized in that: the distance≤0.5mm between described electromagnetism telefault (3) and the flexible member (4), can extrapolate the parameter of telefault (L), and be according to coiling telefault (L) with this parameter, the cross sectional shape of described electromagnetism telefault (L) is a rectangle.
3, a kind of eddy current air conditioner coolant linear sensor according to claim 1, it is characterized in that: described external pressure input component (9) is mid-to have air conditioner coolant to import valve (6), air conditioner coolant imports on the valve (6) that uniform slit is 3～5 more than one, described uniform slit is the plastic valve structural member, guiding refrigerant arrives the stressed acting surface of the flexible sheet of the diaphragm element (7) in the flexible member (4), guarantees that flexible member (4) under stepless action power elastic deformation takes place.
4, a kind of eddy current air conditioner coolant linear sensor according to claim 1, it is characterized in that: adopt an above soldered joint welding electromagnetism telefault (3) below the described input treatment circuit (2), one of them above soldered joint welding is two weldering end connector welding.
5, a kind of eddy current air conditioner coolant linear sensor according to claim 1 is characterized in that: the material of described flexible member (4) and external pressure input component (9) is stainless steel.
6, a kind of method of work of using the described eddy current air conditioner coolant linear sensor of claim 1 is characterized in that:
When current vortex sensor is worked, power connection, power supply signal detects treatment circuit (2) by first pin (1) entering signal of power pin in the signal output (1) and the integrated circuit block (U1) in the input treatment circuit (2), and clutter is by the 4th electric capacity (C3) filtering in the signal;
Sinusoidal current in the integrated circuit block (U1) is connected with first electric capacity (C0) with the telefault (L) in the electromagnetism telefault (3) by the 6th pin (6) of integrated circuit block (U1) and is constituted oscillating circuit, and the effect of telefault (L) earthquake circuit produces induction electromotive force E down
0, produce current vortex on the flexible sheet of the diaphragm element (7) in flexible member (4);
Air conditioner coolant enters external pressure input component (9), import valve (6) through the refrigerant plastics, arrive the stress surface of the flexible sheet of the diaphragm element (7) in the flexible member (4), flexible sheet produces elastic deformation δ under the effect of air conditioner coolant pressure P, cause between the end face of the flexible sheet of the diaphragm element (7) in the flexible member (4) and electromagnetism telefault (3) apart from the d Δ d that changes;
Current vortex in the flexible sheet reacts on telefault (L), produces induction electromotive force E in telefault (L)
1, metering circuit records the changes delta E=E of induction electromotive force in the telefault (L)
0-E
1, be converted into voltage and unite output through the processing of integrated circuit block (U1) inter-process circuit by second pin (2) and three-prong (3), externally export by the output contact pin of signal output (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200810020768XA CN100526823C (en) | 2008-02-23 | 2008-02-23 | Eddy current air conditioner coolant linear sensor and its working method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200810020768XA CN100526823C (en) | 2008-02-23 | 2008-02-23 | Eddy current air conditioner coolant linear sensor and its working method |
Publications (2)
| Publication Number | Publication Date |
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| CN101236117A true CN101236117A (en) | 2008-08-06 |
| CN100526823C CN100526823C (en) | 2009-08-12 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541466A (en) * | 2018-12-07 | 2019-03-29 | 雷勃电气（苏州）有限公司 | A kind of Electric machine structure part fatigue life on-line measuring device and detection method |
| CN109690097A (en) * | 2016-08-30 | 2019-04-26 | 蒂森克虏伯罗特艾德有限公司 | Bearing and for monitor abrasion and/or measurement load method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5591900A (en) * | 1992-12-04 | 1997-01-07 | Trw Vehicle Safety Systems Inc. | Method and apparatus for testing fluid pressure in a sealed vessel |
| IT1303602B1 (en) * | 1998-12-15 | 2000-11-14 | Bitron Spa | INDUCTIVE PRESSURE TRANSDUCER. |
| CN2811952Y (en) * | 2005-06-13 | 2006-08-30 | 夏惠兴 | Online monitoring and protecting device for rotary machinery |
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2008
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109690097A (en) * | 2016-08-30 | 2019-04-26 | 蒂森克虏伯罗特艾德有限公司 | Bearing and for monitor abrasion and/or measurement load method |
| US10738826B2 (en) | 2016-08-30 | 2020-08-11 | Thyssenkrupp Rothe Erde Gmbh | Bearing and method for monitoring wear and/or measuring a load |
| CN109541466A (en) * | 2018-12-07 | 2019-03-29 | 雷勃电气（苏州）有限公司 | A kind of Electric machine structure part fatigue life on-line measuring device and detection method |
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| Publication number | Publication date |
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| CN100526823C (en) | 2009-08-12 |
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