An intelligent multi-parameter oil quality monitoring device

Abstract

The present invention discloses an intelligent multi-parameter oil quality monitoring device, comprising: a housing with a detection end and an output end at both ends, a resonant cavity and a detection cavity are arranged inside the housing, a particle detection channel and an oil port are provided on the housing; a monitoring component, including a sensing circuit module, a tuning fork resonance sensor, a temperature sensor and a microfluidic chip, the tuning fork resonance sensor includes a quartz tuning fork, the microfluidic chip includes a capacitor, and the capacitor includes electrode plates. This intelligent multi-parameter oil quality monitoring device integrates the temperature sensor, the tuning fork resonance sensor and the microfluidic chip inside the housing. By installing the housing on the oil pipe, multiple parameters such as the viscosity, dielectric constant, temperature, abrasive particle size, density, etc. in the oil can be monitored simultaneously, so as to accurately judge the oil quality, avoid false alarms, and perform data transmission through the sensing circuit module, with high integration, small volume and strong anti-interference ability.

Description

Technical Field

[0001] The present invention relates to the technical field of oil fluid detection, and in particular to an intelligent multi-parameter oil quality monitoring device. Background Art

[0002] Lubricating oil is the blood of mechanical equipment and plays important roles such as reducing friction, cooling, cleaning, and anti-corrosion in mechanical equipment. Therefore, the normal operation of the equipment depends on the good operation of the lubricating oil system. Lubricating oil pollution is also one of the main reasons for equipment failures and reduced working life. Therefore, it is crucial to monitor the pollution degree of lubricating oil and remind users to replace the lubricating oil in a timely manner.

[0003] In the prior art, Chinese patents with application numbers CN202110454283.7, CN202221652735.9, CN215375412U, and CN202221652735.9 disclose different oil fluid quality monitoring sensors. Although the above-mentioned monitoring sensors can detect multiple parameters of the oil fluid, most of them mainly achieve specific functions independently, that is, by installing multiple sensors, such as an oil fluid particle concentration detection sensor, an oil level monitoring sensor, a viscosity detection sensor, a moisture detection sensor, etc., and installing the above-mentioned multiple sensors in the oil circuit for separate detection to obtain different parameters, so as to judge the quality of the oil fluid.

[0004] Adopting the above method requires installing different sensors at multiple positions in the oil circuit, with low integration, large installation space occupation, and troublesome installation, and it is not easy to operate on-site; moreover, after the above-mentioned sensors are installed, the detection positions are fixed. For an oil circuit with a large cross-sectional size, there are certain differences in parameters such as the particle concentration, temperature, and viscosity of the oil fluid at different depths of the liquid level. However, the detection positions of the sensors are fixed and single, making it difficult to achieve comprehensive measurement of the oil fluid at different depths, reducing the detection accuracy; in addition, after long-term detection, fine particles are likely to mix into the sensors, affecting the detection accuracy of the sensors. Therefore, it is necessary to regularly remove the sensors, discharge the accumulated particles in the sensors, and then install them on the oil pipe for detection. During the removal period, the oil fluid cannot be detected, and the regular disassembly and installation are troublesome.

[0005] Therefore, it is necessary to improve the oil fluid quality sensors in the prior art. Summary of the Invention

[0006] The purpose of the present invention is to overcome the defects existing in the prior art and provide an intelligent multi-parameter oil quality monitoring device with high integration, convenient installation, capable of comprehensively detecting the oil fluid at different depth positions, free from disassembly and installation, and convenient to use.

[0007] To achieve the above technical effects, the technical solution of the present invention is: An intelligent multi-parameter oil quality monitoring device, comprising:

[0008] A housing, with the two ends of the housing being a detection end and an output end respectively. A resonant cavity and a detection cavity are arranged separately inside the housing. A particle detection channel penetrating through the detection cavity and oil ports communicating with the resonant cavity and distributed along the circumferential direction of the housing are provided on the housing.

[0009] A monitoring assembly, which includes a sensing circuit module, a tuning fork resonance sensor, a temperature sensor, and a microfluidic chip. The sensing circuit module is arranged in the detection cavity. The tuning fork resonance sensor includes a quartz tuning fork arranged in the resonant cavity. The microfluidic chip includes a capacitor, and the capacitor includes electrode plates respectively arranged on both sides of the oil channel and located in the detection cavity. The tuning fork resonance sensor, the temperature sensor, and the microfluidic chip are all electrically connected to the output end through the sensor circuit module.

[0010] Preferably, for the convenience of assembling the housing, the housing includes a tuning fork protective cover, a bottom case, a base, a middle case, and an upper case in sequence along the distribution direction of the detection end and the output end. The oil ports and the particle detection channel are respectively arranged on the tuning fork protective cover and the bottom case. The resonant cavity is formed by enclosing of the tuning fork protective cover and the bottom case. The detection cavity is formed by enclosing of the bottom case, the base, the middle case, and the upper case.

[0011] Preferably, in order to facilitate the detection of oil parameters under different depths and improve the detection accuracy, the housing is connected with a driving assembly, and the driving assembly is used to drive the housing to move along its own length direction.

[0012] Preferably, in order to realize the axial movement of the housing to detect oil parameters at different depths and ensure high integration at the same time, the driving assembly includes an electromagnet, an elastic member, and a permanent magnet connected in sequence along the distribution direction of the detection end and the output end. The electromagnet is fixedly connected with the housing and is located on the side of the output end far away from the detection end. The electromagnet is slidably connected with the permanent magnet along the length direction of the housing. The sensing circuit module is electrically connected with the electromagnet.

[0013] Preferably, in order to avoid the tuning fork resonance sensor, the temperature sensor, and the microfluidic chip in the housing being affected by the magnetic field interference generated after the electromagnet is energized, the electromagnet is connected with a magnetic isolation member, and the magnetic isolation member covers the circumferential outer edge of the electromagnet and the surface of the electromagnet adjacent to the housing.

[0014] Preferably, in order to achieve the sliding connection between the electromagnet and the housing and the permanent magnet, and at the same time facilitate the signal transmission of the output end, a catheter is fixedly connected to the output end, passing through the electromagnet and the permanent magnet and slidingly connected to the permanent magnet, and a signal transmission cable electrically connected to the output end is arranged in the catheter.

[0015] Preferably, in order to prevent particulate impurities from entering the particulate detection channel and the resonance cavity before detection, a protective cover is further included. The protective cover is adjacent to the tuning fork protective cover and has the same orientation. The protective cover slides along the length direction of the housing between the encapsulation position and the detection position. The protective cover at the encapsulation position covers the oil port and the particulate detection channel, and the protective cover at the detection position is located on the side of the detection end away from the output end.

[0016] Preferably, in order to avoid the accumulation of particles in the tuning fork protective cover, which affects the resonance of the quartz tuning fork and thus reduces the detection accuracy, a first waste discharge port is arranged at the bottom inside the tuning fork protective cover. A baffle that slides axially along itself is also arranged inside the tuning fork protective cover. A push rod is fixed on the protective cover, and the cross-sectional dimension of the push rod is smaller than the cross-sectional dimension of the first waste discharge port. In the encapsulation position, the push rod passes through the inside of the first waste discharge port to abut the baffle to disengage it from the first waste discharge port. In the detection position, the push rod is located on the side of the first waste discharge port away from the output end.

[0017] Preferably, in order to facilitate the discharge of debris inside the protective cover, a second waste discharge port facing the first waste discharge port is arranged at the bottom inside the protective cover, and the inner bottom wall of the protective cover is a diversion chip-discharging surface inclined towards the second waste discharge port.

[0018] Preferably, in order to improve the detection accuracy of the particle concentration in the oil, at least two capacitors are arranged and distributed along the axial direction of the particulate detection channel.

[0019] In summary, compared with the prior art, the intelligent multi-parameter oil quality monitoring device of the present invention integrates a temperature sensor, a tuning fork resonance sensor, and a microfluidic chip in the housing, and installs the housing on the oil pipe, so that multiple parameters such as the viscosity, dielectric constant, temperature, abrasive particle size, and density in the oil can be monitored simultaneously, thereby accurately judging the oil quality, avoiding false alarms, and performing data transmission through the sensing circuit module, with high integration, small volume, and strong anti-interference ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the first embodiment;

[0021] Figure 2 is Figure 1 an exploded schematic diagram of

[0022] Figure 3 It is a schematic structural diagram of another perspective of the first embodiment;

[0023] Figure 4 It is Figure 3 an explosion schematic diagram of;

[0024] Figure 5 It is Figure 1 a schematic sectional structure diagram of;

[0025] Figure 6 It is a schematic diagram of the mechanical model and electrical model of a quartz tuning fork;

[0026] Figure 7 It is a schematic diagram of the electromechanical coupling correspondence of a quartz tuning fork;

[0027] Figure 8 It is a schematic diagram of the function curve of the frequency-impedance spectrum of a quartz tuning fork;

[0028] Figure 9 It is a schematic circuit diagram of the electrical connection between a microfluidic chip and a sensing circuit module;

[0029] Figure 10 It is a schematic structural diagram of the second embodiment;

[0030] Figure 11 It is a schematic structural diagram of the installation of the second embodiment;

[0031] Figure 12 It is Figure 11 an explosion schematic diagram of;

[0032] Figure 13 It is Figure 11 a partial structural schematic diagram of;

[0033] Figure 14 It is Figure 13 an explosion schematic diagram of;

[0034] Figure 15 It is Figure 11 a schematic sectional structure diagram of;

[0035] Figure 16 It is Figure 15 an enlarged view of part A of;

[0036] Figure 17 It is Figure 11 another schematic sectional structure diagram of;

[0037] Figure 18 It is Figure 17 an enlarged view of part B of;

[0038] Figure 19 It is a schematic structural diagram of a tuning fork protective cover and a baffle;

[0039] Figure 20 It is a schematic structural diagram in the usage state of the second embodiment;

[0040] Figure 21 is Figure 20 front view of

[0041] Figure 22 is Figure 20 schematic cross-sectional structure diagram of

[0042] Figure 23 is Figure 22 front view of

[0043] In the figure: 1. Outer shell; 11. Tuning fork protective cover; 111. Detection end; 112. Oil port; 113. First waste discharge port; 114. Baffle; 115. Gasket; 116. Chute; 117. Slide block; 12. Bottom shell; 121. Particle detection channel; 13. Sealing ring; 14. Base; 141. First surrounding strip; 15. Middle shell; 151. Second surrounding strip; 16. Upper shell; 161. Output end; 162. Connector; 17. Resonant cavity; 18. Detection cavity; 19. Fastening sleeve; 191. Sliding sleeve; 2. Monitoring component; 21. Sensing circuit module; 211. Power cord; 22. Tuning fork resonance sensor; 221. Quartz tuning fork; 222. Circuit board; 23. Temperature sensor; 24. Microfluidic chip; 3. Driving component; 31. Electromagnet; 311. Magnetic isolation part; 32. Elastic part; 33. Permanent magnet; 34. Conduit; 341. Signal transmission cable; 4. Protective cover; 41. Thumb rod; 42. Second waste discharge port; 43. Flow guiding and chip removal surface; 44. Slide bar; 45. Limit block; 5. Mounting component; 51. Mounting pipe; 52. Bolt; 53. Nut; 6. Oil pipe; 61. Flange. Specific embodiments

[0044] The following combines the accompanying drawings and embodiments to further describe the specific embodiments of the present invention. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present invention.

[0045] First embodiment

[0046] As Figures 1 - 9 shown, the intelligent multi-parameter oil quality monitoring device of the first embodiment of the present invention includes:

[0047] An outer shell 1, with a detection end 111 and an output end 161 at both ends of the outer shell 1. A separated resonant cavity 17 and a detection cavity 18 are arranged inside the outer shell 1. A particle detection channel 121 penetrating the detection cavity 18 and an oil port 112 communicating with the resonant cavity 17 and distributed along the circumferential direction of the outer shell 1 are provided on the outer shell 1;

[0048] Monitoring component 2, the monitoring component 2 includes a sensing circuit module 21, a tuning fork resonance sensor 22, a temperature sensor 23 and a microfluidic chip 24. The sensing circuit module 21 is arranged in the detection cavity 18. The tuning fork resonance sensor 22 includes a quartz tuning fork 221 arranged in the resonance cavity 17. The microfluidic chip 24 includes a capacitor. The capacitor includes electrode plates respectively arranged on both sides of the oil passage and located in the detection cavity 18. The tuning fork resonance sensor 22, the temperature sensor 23 and the microfluidic chip 24 are all electrically connected to the output end 161 through the sensor circuit module.

[0049] For the convenience of device assembly, the structure of the housing 1 is as Figures 1 - 5 shown. The housing 1 includes a tuning fork protection cover 11, a bottom shell 12, a base 14, a middle shell 15 and an upper shell 16 that are sequentially connected along the distribution direction of the detection end 111 and the output end 161. The oil port 112 and the particle detection channel 121 are respectively arranged on the tuning fork protection cover 11 and the bottom shell 12. The resonance cavity 17 is formed by enclosing the tuning fork protection cover 11 and the bottom shell 12. The detection cavity 18 is formed by enclosing the bottom shell 12, the base 14, the middle shell 15 and the upper shell 16.

[0050] Further specifically, taking the normal use state of the device as an example, the detection end 111 is directly below the output end 161. A threaded section is integrally connected coaxially below the bottom shell 12. The top of the tuning fork protection cover 11 is threadedly connected to the threaded section on the bottom shell 12, and an elastic washer 115 made of rubber is arranged between the tuning fork protection cover 11 and the bottom shell 12. The bottom of the tuning fork protection cover 11 is the detection end 111. A round hole coaxial with itself is arranged at the bottom of the bottom shell 12. The tuning fork resonance sensor 22 includes a circuit board 222 filled and fixed in the round hole and a quartz tuning fork 221 welded and fixed directly below the circuit board 222. In this way, the tuning fork protection cover 11 and the bottom shell 12 enclose to form the resonance cavity 17 and the quartz tuning fork 221 is located in the resonance cavity 17.

[0051] Both the base 14 and the middle shell 15 are hollow cylindrical structures, and the two are fixedly connected by welding. External threads are arranged on the outer periphery of the base 14. A sealing ring 13 made of rubber is arranged between the base 14 and the bottom shell 12. The base 14, the middle shell 15, the bottom shell 12, the sealing ring 13 and the tuning fork protection cover 11 are coaxially connected. A fastening sleeve 19 is sleeved outside the bottom shell 12. Internal threads are arranged on the circumferential inner wall of the fastening sleeve 19, and the internal threads match the external threads. One end of the fastening sleeve 19 close to the detection end 111 is provided with a pressing ring, and the pressing ring abuts against the bottom surface of the bottom shell 12. In this way, the base 14 and the bottom shell 12 are hermetically and firmly connected through the fastening sleeve 19; the top of the upper shell 16 is sealed, and the bottom is threadedly connected to the top of the middle shell 15. In this way, the upper shell 16 forms a waterproof cover structure, which can prevent water vapor from entering the housing 1. After adopting the above structure, the bottom shell 12, the base 14, the middle shell 15 and the upper shell 16 enclose to form the detection cavity 18.

[0052] The particle detection channel 121 is integrally formed on the bottom case 12 and penetrates through the detection cavity 18. In the monitoring assembly 2, the temperature sensor 23 is fixed directly above the circuit board 222. The sensing circuit module 21 is a circuit board, which is fixedly welded in the detection cavity 18 and located directly above the particle detection channel 121. The microfluidic chip 24 includes a capacitor, and the two electrode plates of the capacitor are respectively located on both sides of the particle detection channel 121 and fixedly connected to the sensing circuit module 21.

[0053] The top end of the upper case 16 is the output terminal 161 for outputting detection signals. Specifically, the output terminal 161 is provided with a connector 162, and the connector 162 is an aviation connector, which is connected to the locomotive on-line monitoring module in a four-wire system (one pair is used to access the power supply to supply power to the sensing circuit module 21, and the other pair is used to connect the 485 communication cable for convenient data transmission). The connection cable is formed by twisting two pairs of twisted pairs and then wrapping them with a metal shielding net. There is no electrical connection between the sensor housing and the shielding of the connection cable.

[0054] The particle detection channel 121 and the microfluidic chip 24 of the present invention are used in combination to detect the particle concentration in the oil. The temperature sensor 23 can detect the temperature of the oil. The tuning fork resonance sensor 22 is a sensor that measures using the vibration characteristics of the quartz tuning fork 221. The quartz tuning fork 221 is a vibrating body with a fixed frequency. After being inserted into the oil, under the dynamic action generated by the flowing oil, the quartz tuning fork 221 can vibrate at a certain frequency and amplitude. The tuning fork protective cover 11 can protect the quartz tuning fork 221. On the one hand, it reduces the damage caused by the external force before being inserted into the oil, and on the other hand, it can weaken the acting force of the oil to avoid the damage of the quartz tuning fork 221 when the oil flow rate is too large.

[0055] The working principle of the tuning fork resonance sensor 22 is based on the resonance characteristics of the tuning fork. When the tuning fork is subjected to an external force, it can vibrate at a specific frequency and amplitude. Therefore, when the quartz tuning fork 221 is immersed in the oil, due to parameters such as the viscosity and density of the oil, the vibration of the quartz tuning fork 221 is affected, causing the tuning fork vibration frequency to change. The vibration frequency data of the quartz tuning fork 221 is collected through the circuit board 222, so that the relevant parameters of the oil, such as viscosity and density, can be indirectly obtained.

[0056] Since the tuning fork resonant sensor 22 is easily affected by other parameters of the oil, such as temperature and particle impurities, when detecting the quality of the oil, the detection accuracy of the tuning fork resonant sensor 22 is reduced. Therefore, a temperature sensor 23 and a microfluidic chip 24 are arranged in the detection chamber 18 to detect the temperature and particle concentration of the oil respectively. The tuning fork resonant sensor 22, the temperature sensor 23 and the microfluidic chip 24 transmit the detected data to the sensor circuit module 21. The sensor circuit module 21 integrates the acquired data to eliminate the influence of temperature and particle concentration on the viscosity and density of the oil. In this way, the device can comprehensively acquire multiple parameters of the oil by integrating the sensor circuit module 21, the tuning fork resonant sensor 22, the temperature sensor 23 and the microfluidic chip 24, and ensure the accuracy and reliability of oil parameter monitoring to prevent errors.

[0057] In the microfluidic chip 24, two parallel metal electrode plates arranged on both sides of the particle detection channel 121 constitute a simplest capacitor. The capacitance value of this capacitor is related to the dielectric constant of the medium filled between the two electrode plates. When the dielectric constant of the dielectric changes, the corresponding capacitance value also changes. Since the dielectric constants of the particles to be tested are different from those of the oil, when the particles flow into the particle detection channel 121 with the oil, when the particles pass through the capacitive sensor formed by the two electrode plates, it is equivalent to that the buffer solution of equal volume is replaced by the particles, and the dielectric constant of the capacitive detection area changes, thereby causing the detected capacitance value to change. The purpose of counting can be achieved by measuring the capacitance value, and the measured signal amplitude can reflect the size of the particles. Therefore, by setting the microfluidic chip 24, the particle concentration in the oil and the dielectric constant of the oil can be detected.

[0058] A further improvement is that at least two capacitors are provided and distributed along the axial direction of the particle detection channel 121 .

[0059] Specifically, in the present invention, there are four capacitors, namely the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4. The measuring ranges of the four capacitors can be consistent, and the detection accuracy can be improved through multiple measurements. Different measuring range units can also be used to facilitate the measurement of particles of different sizes, which can also improve the detection concentration.

[0060] like Figure 9 As shown, the positive electrode of the first capacitor C1 is connected to the non-inverting input terminal of the first operational amplifier IC2A, and the negative electrode is connected to the inverting input terminal of the first operational amplifier IC2A. The two ends of the circuit formed by the second resistor R2 and the sixth capacitor C6 in parallel are respectively connected to the inverting input terminal and the signal output terminal of the first operational amplifier IC2A, and the combination forms a charge amplifier, and the AMP1 signal is output through the first operational amplifier IC2A.

[0061] The positive electrode of the second capacitor C2 is connected to the non-inverting input terminal of the second operational amplifier IC2B, and the negative electrode is connected to the inverting input terminal of the second operational amplifier IC2B. The two ends of the circuit formed by the parallel connection of the fourth resistor R4 and the seventh capacitor C7 are respectively connected to the inverting input terminal and the signal output terminal of the second operational amplifier IC2B, and they are combined to form a charge amplifier, and the AMP2 signal is output through the second operational amplifier IC2B.

[0062] The positive electrode of the third capacitor C3 is connected to the non-inverting input terminal of the third operational amplifier IC3A, and the negative electrode is connected to the inverting input terminal of the third operational amplifier IC3A. The two ends of the circuit formed by the parallel connection of the sixth resistor R6 and the eighth capacitor C8 are respectively connected to the inverting input terminal and the signal output terminal of the third operational amplifier IC3A, and they are combined to form a charge amplifier, and the AMP3 signal is output through the third operational amplifier IC3A.

[0063] The positive electrode of the fourth capacitor C4 is connected to the non-inverting input terminal of the fourth operational amplifier IC3B, and the negative electrode is connected to the inverting input terminal of the fourth operational amplifier IC3B. The two ends of the circuit formed by the parallel connection of the eighth resistor R8 and the ninth capacitor C9 are respectively connected to the inverting input terminal and the signal output terminal of the fourth operational amplifier IC3B, and they are combined to form a charge amplifier, and the AMP4 signal is output through the fourth operational amplifier IC3B.

[0064] The power supply VCC supplies power to the first operational amplifier IC2A and the third operational amplifier IC3A, and is respectively connected to the GND terminals of the first operational amplifier IC2A and the third operational amplifier IC3A through the tenth capacitor C10 and the eleventh capacitor C11; the reference power supply REF is connected to the first resistor R1, the non-inverting input terminal of the first operational amplifier IC2A is connected to the first resistor R1 through the third resistor R3, the non-inverting input terminal of the second operational amplifier IC2B is connected to the first resistor R1 through the fifth resistor R5, the non-inverting input terminal of the third operational amplifier IC3A is connected to the first resistor R1 through the seventh resistor R7, and the non-inverting input terminal of the fourth operational amplifier IC3B is connected to the first resistor R1 through the ninth resistor R9.

[0065] Based on the piezoelectric characteristics of the quartz tuning fork 221, the quartz tuning fork 221 also has corresponding mechanical and electrical structure models, such as Figure 2 and Figure 4 shown, the quartz tuning fork 221 is composed of a tuning fork arm and a tuning fork base made of quartz crystal. Based on the X0° to 5° cut type, the structure of the tuning fork is made, and it will operate in a lower resonant frequency range and can achieve a higher quality factor.

[0066] The mechanical model of the quartz tuning fork 221 is a second-order damped-mass-spring model, such as Figure 6As shown on the left side, the mechanical structure of the quartz tuning fork 221 can be equivalently modeled as a cantilever beam, and its effective mass is: m = 0.2427rρLWT.

[0067] Where: ρ — the density of the quartz crystal (2.65 g / cm 3 ); L — the length of the tuning fork cantilever; W — the width of the tuning fork cantilever; T — the thickness of the tuning fork cantilever.

[0068] When the quartz tuning fork 221 resonates, the relationship between the resonance frequency and the mechanical parameters is as follows:

[0069]

[0070]

[0071] Where: Y — Young's modulus of the quartz crystal; k — the elastic coefficient of the quartz crystal. Young's modulus characterizes the resistance of a solid material to deformation. The larger the value of Y, the harder the material. For the quartz crystal, Y = 7.87×10^10 Pa.

[0072] The electrical model of the quartz tuning fork 221 is an RLC series circuit, as Figure 6 shown on the right side. Among them, RLC corresponds to the equivalent circuit of the piezoelectric characteristics of the quartz tuning fork 221, also known as the dynamic branch of the tuning fork, and C 0 is the parasitic capacitance caused by the electrodes laid on the surface of the tuning fork, resulting in the coupling between the tuning fork cantilevers, also known as the static branch of the tuning fork. Figure 7 Shows the corresponding relationship of the electromechanical coupling model of the quartz tuning fork 221.

[0073] Based on this, the series resonance frequency fo and the equivalent inductance L can be obtained as described below:

[0074]

[0075]

[0076] Without considering the influence of C 0 on the quartz tuning fork 221, the quality factor Q, equivalent impedance Z, and equivalent admittance Y at the series resonance point are shown in the following three equations. From the following equations, it can be seen that when the quartz tuning fork 221 is in the series resonance state, the resonance frequency ω = ω 0 , the impedance is resistive, without inductance and capacitance, and the impedance is at its minimum value.

[0077]

[0078]

[0079]

[0080] In a quartz tuning fork 221 and its driving circuit, there is usually a static capacitance C composed of the capacitance between the tuning fork arms and between the leads. 0 When the frequency of the exciting AC voltage is not equal to the resonant frequency, the equivalent impedance of the tuning fork is affected by C. 0 The impedance of the static capacitance is as follows:

[0081]

[0082] The RLC dynamic branch of the tuning fork and C 0 The static branch are in parallel, and the resonance between them is called parallel resonance. Assume that the impedance of the tuning fork is measured to be the largest at the frequency fa, and parallel resonance occurs at this time. Figure 8 is the frequency-impedance spectrum of the quartz tuning fork 221 in air. The angular frequency ωa at fa is shown as follows:

[0083]

[0084] At this time, the equivalent admittance of the quartz tuning fork 221 is as follows:

[0085]

[0086] It can be known that when ω = ω 0 , M = ω 0 2 C 2 R 2 , the impedance is the smallest, which is the series resonance point of the quartz tuning fork 221; when ω = ω a , the impedance is the largest, which is the parallel resonance point of the quartz tuning fork 221. The series resonance frequency of the quartz tuning fork 221 is not affected by the static capacitance, only the impedance magnitude is affected. Since the magnitude of the static capacitance C 0 is uncertain, the parallel resonance frequency of the quartz tuning fork 221 is not in a stable state. Usually, its series resonance frequency and resonance impedance are measured as the resonance point data of the quartz tuning fork 221.

[0087] By monitoring the resonance frequency and equivalent resistance of the quartz tuning fork 221, the value of the viscosity η can be calculated from the above formula:

[0088]

[0089] The design structure parameters of the quartz tuning fork 221 can obtain the value of the coefficient Cn, and the electromechanical coupling coefficient α can also be obtained by calculation. Only the resonance frequency f l of the quartz tuning fork 221 in the oil product and the equivalent resistance R need to be measured. After obtaining the accurate density of the oil product, the viscosity of the oil product can be obtained. In order to obtain more accurate measurement results, samples with known viscosities can be used to calibrate the coefficients Cn and α.

[0090] When the oil viscosity is greater than 1 cP, the influence of viscosity on the resonant frequency of the quartz tuning fork 221 cannot be ignored, and the calculation formula for density can be obtained as follows:

[0091]

[0092] Among them,

[0093] Coefficient C ρ0 and C ρη can both be obtained from the geometric dimensions and density of the quartz tuning fork 221. C ρ0 is a constant based on the geometric dimensions of the quartz tuning fork 221 and the quartz density. If the accuracy of the coefficient is to be improved, calibration can also be carried out through experiments. Therefore, after measuring the accurate viscosity value of the liquid, by measuring the vibration frequency f l of the tuning fork in the liquid, the density value of the liquid can be calculated.

[0094] Therefore, the above monitoring device can comprehensively obtain multiple parameters of the oil fluid when integrating the sensing circuit module 21, the tuning fork resonance sensor 22, the temperature sensor 23 and the microfluidic chip 24, including the particle concentration, dielectric constant, temperature, density, viscosity, and dielectric constant of the oil fluid, and has the advantages of small volume, convenient installation, digital transmission, and strong anti-interference ability.

[0095] Second Embodiment

[0096] As Figures 10 - 19 shown, the intelligent multi-parameter oil quality monitoring device of the second embodiment of the present invention is based on the first embodiment, and the difference is that the housing 1 is connected with a driving component 3, and the driving component 3 is used to drive the housing 1 to move along its own length direction.

[0097] Through the driving component 3, the housing 1 can be driven to move along its own length direction. After the housing 1 is installed on the oil pipe in a non-horizontal direction, the driving component 3 can be used to change the height position of the housing 1, and then change the positions of the oil fluid port 112 and the particle detection channel 121, so as to realize the measurement of multiple parameters of the oil fluid at different depths, expand the monitoring range, and thus be beneficial to improving the detection accuracy and avoiding the deviation of the monitoring results caused by the different viscosities, temperatures, and particle concentrations in the oil fluid due to different depths.

[0098] A further improvement is that in order to improve the integration degree of the device, the driving component 3 includes an electromagnet 31, an elastic member 32 and a permanent magnet 33 connected in sequence along the distribution direction of the detection end 111 and the output end 161. The electromagnet 31 is fixedly connected with the housing 1 and is located on the side of the output end 161 away from the detection end 111. The electromagnet 31 is slidably connected with the permanent magnet 33 along the length direction of the housing 1, and the sensing circuit module 21 is electrically connected with the electromagnet 31.

[0099] Specifically, asFigures 10 - 12 As shown, the device is arranged on the oil pipe through the installation component 5. The installation component 5 includes an installation pipe 51 extending in the vertical direction. Flanges are provided at both ends of the installation pipe 51. The flange at the bottom is used to be fixed above the oil pipe, and the flange at the upper part is fixedly connected to the permanent magnet 33 through the bolt 52 and nut 53 connected by threads, so that the permanent magnet 33 covers the upper part of the installation pipe 51. The electromagnet 31 and the elastic member 32 are both arranged below the permanent magnet 33 and inside the installation pipe 51.

[0100] The elastic member 32 is a spring, preferably a non-metallic spring, such as a polyurethane spring, a glass fiber spring, etc. In order to realize the safe connection between the sensing circuit module 21 and the electromagnet 31, both sides of the sensing circuit module 21 are respectively connected to the electromagnet 31 through two power lines 211. After the external power supply supplies power to the sensing circuit module 21 through the connector 162, the sensing circuit module 21 can supply power to the electromagnet 31 through the power lines 211 to control the magnetic field direction and magnetic field intensity of the electromagnet 31. The two sides of the base 14 are integrally formed with L-shaped first surrounding strips 141, and the two sides of the middle shell 15 are integrally formed with second surrounding strips 151. The first surrounding strips 141 and the second surrounding strips 151 correspond to the power lines 211 one by one, and enclose to form a surrounding cavity surrounding the power lines 211. One end of the first surrounding strip 141 away from the base 14 and one end of the second surrounding strip 151 away from the middle shell 15 are both fixed directly below the electromagnet 31. In this way, the sensing circuit module 21 can safely supply power to the electromagnet 31 through the first surrounding strip 141 and the second surrounding strip 151. And as the magnetic field intensity and magnetic field direction of the electromagnet 31 change, after the electromagnet 31 moves up and down, it drives the first surrounding strip 141 and the second surrounding strip 151 to move up and down, changing the height position of the outer shell 1, and further changing the detection depth position of the device for the oil fluid.

[0101] A further improvement is that the electromagnet 31 is connected with a magnetic isolation member 311, and the magnetic isolation member 311 covers the circumferential outer edge of the electromagnet 31 and the surface of the electromagnet 31 adjacent to the outer shell 1. The magnetic isolation member 311 is a barrel-shaped structure made of a magnetic isolation material, and its bottom and circumferential inner wall are respectively fixedly connected to the bottom surface and the circumferential outer edge of the electromagnet 31, and are used to limit the magnetic field range generated after the electromagnet 31 is energized, and prevent the magnetic field from passing through the magnetic isolation member 311 and affecting the normal monitoring operation of the particles in the oil fluid and the monitoring component 2.

[0102] A further improvement is that the circumferential outer edge of the magnetic isolation member 311 is hermetically connected to the circumferential inner wall of the installation pipe 51. In this way, it can prevent the oil fluid in the oil pipe from flowing upward to the upper part of the electromagnet 31, thereby preventing the elastic member 32 and the permanent magnet 33 from contacting the oil fluid and affecting the normal use of the driving component 3. At the same time, through the hermetic connection between the magnetic isolation member 311 and the installation pipe 51, it can also prevent the oil fluid from overflowing outside the installation pipe 51.

[0103] A further improvement is that a conduit 34 is fixedly connected to the output end 161. The conduit 34 penetrates through the electromagnet 31 and the permanent magnet 33 and is slidably connected to the permanent magnet 33. A signal transmission cable 341 electrically connected to the output end 161 is arranged inside the conduit 34, and the conduit 34 is coaxial with the housing 1. After adopting the above structure, the conduit 34 can guide the moving directions of the electromagnet 31 and the housing 1. After the magnetic field of the electromagnet 31 changes, it can guide the electromagnet 31 and the housing 1 to move smoothly along the axial direction of the conduit 34. The signal transmission cable 341 inside the conduit 34 is convenient for connecting a data plug for signal transmission. At the same time, the conduit 34 can also protect the signal transmission cable 341 from being corroded by the oil fluid.

[0104] A further improvement is that a protective cover 4 is further included. The protective cover 4 is adjacent to the tuning fork protective cover 11 and has the same orientation. The protective cover 4 slides between a packaging position and a detection position along the length direction of the housing 1. The protective cover 4 at the packaging position covers the oil port 112 and the particle detection channel 121, and the protective cover 4 at the detection position is located on the side of the detection end 111 away from the output end 161.

[0105] Specifically, as Figures 12 - 15 shown, both sides of the fastening sleeve 19 are integrally connected with sliding sleeves 191 extending along the axial direction parallel to the conduit 34. Both sides of the protective cover 4 are integrally connected with sliding rods 44 corresponding to and slidably mating with the sliding sleeves 191 one by one. A limiting block 45 is fixed on the side of the sliding rod 44 away from the protective cover 4 to prevent the sliding rod 44 from disengaging from the sliding sleeve 191. Through the sliding rod 44 and the sliding sleeve 191, the detection position and the packaging position as Figure 13 shown are achieved. In the packaging position, the protective cover 4 can protect the particle detection channel 121 and the oil port 112 of the housing 1, preventing the quartz tuning fork 221 from being damaged and deformed by external sundries passing through the oil port 112 before the device is inserted into the oil pipe, and preventing sundries from entering the particle detection channel 121 and blocking it, resulting in the inability to detect the particle concentration in the oil fluid and affecting the detection of other parameters of the oil fluid. When the device is in use, the detection end 111 faces downward, causing the protective cover 4 to slide downward under gravity until the bottom surface of the limiting block 45 contacts the top surface of the sliding sleeve 191. At this time, the protective cover 4 is in the detection position. In this position, the particle detection channel 121 and the oil port 112 are opened, facilitating the detection of various index parameters in the oil fluid. The protective cover 4 is preferably made of an oil-resistant metal material with a relatively large density, such as aluminum, stainless steel, or nickel alloy. On the one hand, it can prevent being corroded by the oil fluid in the oil pipe. On the other hand, after the device moves downward, the protective cover 4 can slide downward in the oil fluid in the oil pipe under the influence of its own gravity until the limiting block 45 contacts the sliding sleeve 191.

[0106] A further improvement is that a first row of waste ports 113 is provided at the bottom inside the tuning fork protective cover 11. A baffle 114 that slides axially along itself is also provided inside the tuning fork protective cover 11. A push rod 41 is fixed on the protective cover 4. The cross-sectional dimension of the push rod 41 is smaller than the cross-sectional dimension of the first row of waste ports 113. In the encapsulation position, the push rod 41 passes through the inside of the first row of waste ports 113 to abut the baffle 114 away from the first row of waste ports 113. In the detection position, the push rod 41 is located on the side of the first row of waste ports 113 away from the output end 161. A second row of waste ports 42 facing the first row of waste ports 113 is provided at the bottom inside the protective cover 4. The inner bottom wall of the protective cover 4 is a diversion chip discharging surface 43 that slopes towards the second row of waste ports 42.

[0107] In addition, two sliding grooves 116 that face each other and extend parallel to the axial direction of the tuning fork protective cover 11 are provided on the circumferential inner wall of the tuning fork protective cover 11. The first row of waste ports 113 is a strip-shaped port provided between the two sliding grooves 116 and whose length direction is parallel to the notch directions of the two sliding grooves 116. Sliders 117 are provided at both ends of the baffle 114. The sliders 117 are slidably matched with the sliding grooves 116. The second row of waste ports 42 is provided at the central position of the inner bottom wall of the protective cover 4. The diversion chip discharging surface 43 is a conical surface. The bottom surface of the tuning fork protective cover 11 is a plane parallel to its own axial direction.

[0108] During the detection process, as the detection time increases, after the particles in the oil fluid enter the resonance cavity 17 through the oil fluid port 112, some particles are discharged through other oil fluid ports 112, while the remaining particles accumulate inside the tuning fork protective cover 11. As the detection time increases, the total amount of particles accumulated inside the tuning fork protective cover 11 increases, contacting the quartz tuning fork 221, thereby affecting the resonance of the quartz tuning fork 221 and reducing the monitoring accuracy. After adopting the above structure, the particles accumulated inside the tuning fork protective cover 11 can be discharged in time to avoid affecting the detection accuracy. At the same time, there is no need for manual disassembly, cleaning, and then reinstallation. Therefore, it is more convenient to use and can continuously monitor the quality of the oil fluid.

[0109] Specifically, when the electromagnet 31 is energized to generate a magnetic field that repels the permanent magnet 33, the electromagnet 31 and the housing 1 continuously descend, causing the protective cover 4 to also descend. When the protective cover 4 touches the bottom inner wall of the oil pipe, its position no longer decreases. As the housing 1 descends, the distance between the tuning fork protective cover 11 and the protective cover 4 shrinks until the protective cover 4 moves relative to the housing 1 to the encapsulation position. In this state, since the diversion and chip removal surface 43 is a conical surface and the bottom surface of the tuning fork protective cover 11 is a plane parallel to its own axis, there is a gap between the central position of the diversion and chip removal surface 43, that is, the second waste outlet 42 and the bottom surface of the tuning fork protective cover 11. At the same time, the ejector rod 41 on the diversion and chip removal surface 43 supports the baffle 114, causing the baffle 114 to disengage from the first waste outlet 113, thereby opening the first waste outlet 113. The particles accumulated in the tuning fork protective cover 11 enter the protective cover 4 through the first waste outlet 113.

[0110] After that, by changing the magnetic field of the electromagnet 31, the electromagnet 31 and the housing 1 are kept moving upward. The baffle 114 loses the support of the ejector rod 41 and covers the first waste outlet 113. The electromagnet 31 and the housing 1 continue to move upward. After the top of the sliding sleeve 191 contacts the bottom of the limit block 45, the protective cover 4 is driven to move upward, causing the protective cover 4 to disengage from the bottom inner wall of the oil pipe. In this state, the particles that enter the inner side of the protective cover 4 are discharged from the second waste outlet 42 under the guiding action of the conical diversion and chip removal surface 43, preventing the particles from continuously accumulating in the protective cover 4.

[0111] Therefore, after adopting the above structure, the housing 1 and the protective cover 4 are first lowered and then raised. Through the mutual cooperation of the drive assembly 3, the protective cover 4, the ejector rod 41, and the tuning fork protective cover 11, after the first waste outlet 113 in the tuning fork protective cover 11 is opened, it is convenient for the particles to enter the protective cover 4 through the first waste outlet 113. Then, the particles in the protective cover 4 are discharged from the second waste outlet 42 as the protective cover 4 rises, so there is no need for manual disassembly and cleaning, and the particles in the tuning fork protective cover 11 can be automatically discharged.

[0112] In order to prevent the particles from being affected by the flow of the oil in the oil pipe during the particle discharge process, the inner diameter of the top of the protective cover 4 is the same as the outer diameter of the bottom shell 12. After the protective cover 4 moves to the bottom inside of the oil pipe and the housing 1 continues to descend, the circumferential outer edge of the bottom shell 12 is hermetically fitted with the circumferential inner wall of the protective cover 4. As the bottom shell 12 continues to descend, the oil inside the protective cover 4 can be compressed, and the oil is discharged through the second waste outlet 42. When the ejector rod 41 lifts the baffle 114 away from the first waste outlet 113, under the action of the oil flow, it can guide the particles in the tuning fork protective cover 11 to enter the protective cover 4 through the first waste outlet 113. And as the housing 1 continues to descend, it can also cause some of the particles that enter the protective cover 4 to be discharged through the second waste outlet 42, which is beneficial to the smooth discharge of the particles.

[0113] As Figures 20 - 23 This is a schematic diagram of the installation structure of this embodiment. A detection port is opened at the position to be measured on the oil pipe 6. The detection port is connected to the flange 61. The bottom of the installation pipe 51 is fixedly connected to the oil pipe 6 through the bolt 52 and the nut 53 connected by threads. And the electromagnet 31 is energized through the sensing circuit module 21, and the height positions of the housing 1 and the electromagnet 31 are adjusted. As shown in the figure, the electromagnet 31 attracts the permanent magnet 33, which can shorten the distance between the two, thereby increasing the height of the housing 1. In this way, it is convenient to measure the quality of the oil parameters at the high position of the oil in the oil pipe 6.

[0114] When it is necessary to lower the height position of the housing 1, the electromagnet 31 is powered off, or the current passing through the electromagnet 31 is controlled to make it repel the permanent magnet 33, then the height position of the housing 1 can be lowered, and further the height positions of the particle detection channel 121, the temperature sensor 23 and the quartz tuning fork 221 can be lowered, which is convenient for detecting the oil at a lower position in the oil pipe 6.

[0115] The above is only the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and retouches can still be made, and these improvements and retouches should also be regarded as the protection scope of the present invention.

Claims

1. An intelligent multi-parameter oil quality monitoring device, characterized in that, it includes: A housing (1), with two ends of the housing (1) being a detection end (111) and an output end (161) respectively. A separated resonant cavity (17) and a detection cavity (18) are arranged inside the housing (1). A particle detection channel (121) penetrating through the detection cavity (18) and an oil port (112) communicating with the resonant cavity (17) and distributed along the circumferential direction of the housing (1) are arranged on the housing (1); A monitoring component (2), the monitoring component (2) includes a sensing circuit module (21), a tuning fork resonance sensor (22), a temperature sensor (23) and a microfluidic chip (24). The sensing circuit module (21) is arranged inside the detection cavity (18). The tuning fork resonance sensor (22) includes a quartz tuning fork (221) arranged inside the resonant cavity (17). The microfluidic chip (24) includes a capacitor, and the capacitor includes electrode plates respectively arranged on both sides of the oil channel and located inside the detection cavity (18). The tuning fork resonance sensor (22), the temperature sensor (23) and the microfluidic chip (24) are all electrically connected to the output end (161) through the sensor circuit module; The housing (1) is connected with a driving component (3), and the driving component (3) is used to drive the housing (1) to move along its own length direction; The driving component (3) includes an electromagnet (31), an elastic member (32) and a permanent magnet (33) connected in sequence along the distribution direction of the detection end (111) and the output end (161). The electromagnet (31) is fixedly connected to the housing (1) and is located on the side of the output end (161) away from the detection end (111). The electromagnet (31) is slidably connected to the permanent magnet (33) along the length direction of the housing (1). The sensing circuit module (21) is electrically connected to the electromagnet (31).

2. The intelligent multi-parameter oil quality monitoring device according to claim 1, characterized in that: The housing (1) includes a tuning fork protection cover (11), a bottom shell (12), a base (14), a middle shell (15) and an upper shell (16) connected in sequence along the distribution direction of the detection end (111) and the output end (161). The oil port (112) and the particle detection channel (121) are respectively arranged on the tuning fork protection cover (11) and the bottom shell (12). The resonant cavity (17) is formed by enclosing of the tuning fork protection cover (11) and the bottom shell (12). The detection cavity (18) is formed by enclosing of the bottom shell (12), the base (14), the middle shell (15) and the upper shell (16).

3. The intelligent multi-parameter oil quality monitoring device according to claim 1, characterized in that: The electromagnet (31) is connected with a magnetic isolation member (311), and the magnetic isolation member (311) covers the circumferential outer edge of the electromagnet (31) and the surface of the electromagnet (31) adjacent to the housing (1).

4. The intelligent multi-parameter oil quality monitoring device according to claim 1, characterized in that: A conduit (34) fixedly connected to the output end (161) penetrates through the electromagnet (31) and the permanent magnet (33) and is slidably connected to the permanent magnet (33). A signal transmission cable (341) electrically connected to the output end (161) is arranged in the conduit (34).

5. The intelligent multi-parameter oil quality monitoring device according to claim 1, characterized in that: It further includes a protective cover (4). The protective cover (4) is adjacent to the tuning fork protective cover (11) and has the same orientation. The protective cover (4) slides between a packaging position and a detection position along the length direction of the housing (1). The protective cover (4) at the packaging position covers the oil port (112) and the particle detection channel (121). The protective cover (4) at the detection position is located on the side of the detection end (111) away from the output end (161).

6. The intelligent multi-parameter oil quality monitoring device according to claim 5, characterized in that: A first waste discharge port (113) is arranged at the bottom inside the tuning fork protective cover (11). A baffle plate (114) that slides along its own axis is further arranged inside the tuning fork protective cover (11). A push rod (41) is fixed on the protective cover (4). The cross-sectional dimension of the push rod (41) is smaller than the cross-sectional dimension of the first waste discharge port (113). In the packaging position, the push rod (41) penetrates inside the first waste discharge port (113) to abut the baffle plate (114) to disengage from the first waste discharge port (113). In the detection position, the push rod (41) is located on the side of the first waste discharge port (113) away from the output end (116).

7. The intelligent multi-parameter oil quality monitoring device according to claim 6, characterized in that: A second waste discharge port (42) facing the first waste discharge port (113) is arranged at the bottom inside the protective cover (4). The inner bottom wall of the protective cover (4) is a diversion chip discharging surface (43) inclined towards the second waste discharge port (42).

8. The intelligent multi-parameter oil quality monitoring device according to claim 1, characterized in that: At least two capacitors are provided and are distributed along the axial direction of the particle detection channel (121).

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