CN210803208U - Marine diesel engine crankcase oil mist detection device - Google Patents
Marine diesel engine crankcase oil mist detection device Download PDFInfo
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- CN210803208U CN210803208U CN201921111774.6U CN201921111774U CN210803208U CN 210803208 U CN210803208 U CN 210803208U CN 201921111774 U CN201921111774 U CN 201921111774U CN 210803208 U CN210803208 U CN 210803208U
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Abstract
The utility model relates to a marine diesel engine crankcase oil mist detection device, which comprises an oil mist detection device nasal cavity, a photoelectric conversion module and a power module; one end of the nasal cavity of the oil mist detection device extends into a crankcase of the diesel engine and is communicated with the crankcase; the photoelectric conversion module comprises an LED light source, a light detector, a signal input circuit, an I/V conversion circuit, a voltage control type variable gain amplification circuit and a signal output circuit; the LED light source and the optical detector are both arranged in the nasal cavity of the oil mist detection device; the optical detector is connected with the signal input circuit, the signal input circuit is connected with the I/V conversion circuit, the I/V conversion circuit is connected with the voltage control type variable gain amplification circuit, and the voltage control type variable gain amplification circuit is connected with the signal output circuit; the power module supplies power for the whole device. The utility model discloses marine diesel engine crankcase oil mist detection device uses LED light source and infrared silicon photocell, adopts the light transmission method, through the oil mist to the influence of the extinction degree of infrared components and parts, accurate output corresponds oil mist concentration.
Description
Technical Field
The utility model relates to an engine crankcase oil mist detects technical field, concretely relates to novel marine diesel engine crankcase oil mist detects device.
Background
Since 1897, the diesel engine has developed for over a century, its overall technology has made great progress, playing an irreplaceable role in power machines in various industries and occupying the dominance in ship power, and in all coastal and inland ships, the main engine on most ships adopts the diesel engine. The marine diesel engine is the heart of the whole ship and plays an irreplaceable role in the operation of the ship, so the safety of the diesel engine becomes an important index for measuring the overall performance of the diesel engine.
When the diesel engine works, high-temperature lubricating oil in a crank case can be evaporated to generate oil gas, the oil gas is mixed with cooler air in the crank case to form oil mist, and the explosion of the crank case of the diesel engine can be caused by the excessively high concentration of the oil mist. The diesel engine oil mist concentration detection and alarm device is applied on ships, although relevant parties pay high attention to oil mist explosion risks, accidents still occur due to the fact that detection accuracy of detectors of the diesel engine oil mist concentration detection and alarm device is not enough, and serious economic consequences and personal injury can be caused once the accidents occur. Therefore, it is necessary to develop a crankcase oil mist concentration detection device. The oil mist concentration detection alarm device is a device comprising multiple subjects of semi-conductor science, electronics, optics, mechanical structures and the like, has certain difficulty in the research of the oil mist concentration detection alarm device, and is higher in cost, so that the research and development of a set of economic and high-performance oil mist concentration detector are imperative.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in providing a marine diesel engine crankcase oil mist detection device to the not enough of above-mentioned prior art existence, and the device is one set of low cost, and high performance can be in real time the detection device of accurate detection crankcase oil mist concentration.
The utility model discloses a solve the technical scheme that technical problem that the aforesaid provided adopted and be:
a marine diesel engine crankcase oil mist detection device comprises an oil mist detection device nasal cavity, a photoelectric conversion module and a power supply module; one end of the nasal cavity of the oil mist detection device extends into a crankcase of the diesel engine to be communicated with the crankcase, so that the nasal cavity of the oil mist detection device is filled with oil mist; the photoelectric conversion module comprises an LED light source, a light detector, a signal input circuit, an I/V conversion circuit, a voltage control type variable gain amplification circuit and a signal output circuit; the LED light source and the optical detector are both arranged in the nasal cavity of the oil mist detection device, light beams emitted by the LED light source penetrate through oil mist and irradiate the optical detector, and the optical detector converts optical signals into electric signals; the optical detector is connected with the signal input circuit, the signal input circuit is connected with the I/V conversion circuit, the I/V conversion circuit is connected with the voltage control type variable gain amplification circuit, and the voltage control type variable gain amplification circuit is connected with the signal output circuit; the power module supplies power to the whole device.
In the above-mentioned scheme, the LED light source is installed at the inside end of the nasal cavity of the oil mist detection device and located inside the crankcase, and the optical detector is installed at the outside end of the nasal cavity of the oil mist detection device and located outside the crankcase.
In the scheme, the power supply module comprises a switching power supply and two three-terminal integrated voltage-stabilized power supply chips U298 and U299, wherein the switching power supply provides +24V voltage for the device, the +24V voltage of the switching power supply is converted into +5V voltage by the three-terminal voltage-stabilized integrated power supply chip U298 through a first power supply design circuit, and the +24V voltage of the switching power supply is converted into-5V voltage by the three-terminal voltage-stabilized integrated power supply chip U299 through a second power supply design circuit.
In the scheme, the input end of a three-terminal integrated stabilized voltage power supply chip U298 in the first power supply design circuit is connected with a switching power supply, the GND end is grounded, two ends of the three-terminal integrated stabilized voltage power supply chip U298 are provided with capacitors C475, C476 and C477 and a voltage stabilizing diode D111, and the capacitors C475, C476 and C477 have the functions of smoothing voltage mutation and filtering ripples; the input end of the three-end integrated stabilized voltage power supply chip U299 in the second power supply design circuit is grounded, the GND end is connected with the switching power supply, two ends of the three-end integrated stabilized voltage power supply chip U299 are provided with capacitors C478, C479, C480 and a voltage stabilizing diode D112, and the capacitors C478, C479 and C480 have the functions of smoothing voltage mutation and filtering ripples.
In the scheme, the LED light source is an infrared LED transmitting tube; the optical detector is an infrared silicon photocell.
In the above solution, the I/V conversion circuit includes an operational amplifier U1, a resistor R1, R2, R3, and a capacitor C3, the anode of the infrared silicon photocell is connected between the resistor R2 and the ground to obtain a voltage division value, and the cathode of the infrared silicon photocell is connected to the reverse end of the operational amplifier U1, so that the potential of the cathode point of the infrared silicon photocell is substantially the same as the terminal in the same direction of the operational amplifier U1, and the infrared silicon photocell is in a reverse bias operating state; the resistor R3 is connected with the resistor R2 in parallel and connected with the resistor R1 in series, and the resistor R3 plays a role in increasing the total current; one end of the resistor R1 is connected with the ground, the other end of the resistor R1 is connected with the parallel equivalent resistor of R2 and R3, and R1 plays a role in controlling the bias degree; the infrared silicon photocell converts an optical signal penetrating through the oil mist concentration into an electric signal and converts the collected signal current I0The capacitor C3 connected in parallel with the circuit of the operational amplifier U1 is connected to the 2 nd pin of the operational amplifier U1 for interference rejection.
In the above solution, the voltage-controlled variable gain amplifier circuit includes two operational amplifiers U2A and U2B, which include resistors R4, R8, R10, R14, R15, and R16; the resistor R4 is a rheostat with the maximum resistance value of 100K omega, and is connected between the reverse input end and the output end of the operational amplifier U2A; the resistor R10 is a rheostat with the maximum resistance value of 100K omega, and is connected between +5V and-5V; the resistors R8 and R16 are respectively connected between the homodromous input ends of the two operational amplifiers and the ground, R15 is connected between the inverting input end and the output end of the operational amplifier, and R14 is the input resistor of the inverting input end of the operational amplifier.
The beneficial effects of the utility model reside in that:
1. the utility model discloses a marine diesel engine crankcase oil mist detection device uses LED light source and infrared silicon photocell, adopts the light transmission method, through the oil mist to the influence of the extinction degree of infrared components and parts, accurate output corresponds oil mist concentration. The device has the characteristics of high accuracy, high reaction speed, high sensitivity and good reliability.
2. The device of the utility model is designed elaborately in the layout of components, and the power module and the photoelectric conversion module are separately arranged to prevent the interference between signals; arranging the positions of an LED light source, an infrared silicon photocell, +5, -5V power supply, an I/V conversion circuit and a voltage control type variable gain amplification circuit according to a certain rule; the circuit modules are isolated by the ground wire, so that the coupling of circuit signals is prevented. The safety and the reliability of the hardware circuit are guaranteed.
3. The utility model discloses the device utilizes infrared silicon photocell to replace traditional photosignal conversion that photodiode will gather to the signal of telecommunication, and the photoproduction electric current that produces in the photocell flows in the electric current operational amplifier of I/V converting circuit and amplifies and convert to voltage and export, sets up two operational amplifier in voltage control type variable gain amplifier circuit, and the voltage to output among the I/V converting circuit is enlargied and is handled to the output, makes the utility model has the advantages of job stabilization nature is good, good reliability.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a block diagram of the structure of the crankcase oil mist detection device of the marine diesel engine of the present invention;
fig. 2 is an electrical schematic diagram of a photoelectric conversion module;
fig. 3 is an electrical schematic diagram of an I/V conversion circuit in the photoelectric conversion module shown in fig. 2;
fig. 4 is an electrical schematic diagram of a voltage-controlled variable gain amplifier circuit in the photoelectric conversion module shown in fig. 2;
FIG. 5 is an electrical schematic of a first power supply design circuit of the power supply module;
fig. 6 is an electrical schematic of a second power supply design circuit of the power supply module.
In the figure: 1. a crankcase; 2. an LED light source; 3. a light detector; 4. a nasal cavity of an oil mist detection device; 5. an I/V conversion circuit; 6. a voltage-controlled variable gain amplifier circuit; 7. a voltage stabilizing chip is integrated at the three ends; 8. a switching power supply; 9. a photoelectric conversion module.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, a preferred embodiment of the oil mist detection device for the crankcase of the marine diesel engine of the present invention includes a nasal cavity 4 of the oil mist detection device, a photoelectric conversion module 9 and a power module. One end of the nasal cavity 4 of the oil mist detection device extends into the crankcase 1 of the diesel engine and is communicated with the crankcase 1, so that the nasal cavity 4 of the oil mist detection device is filled with oil mist. The photoelectric conversion module 9 comprises an LED light source 2, a light detector 3, a signal input circuit, an I/V conversion circuit 5, a voltage control type variable gain amplification circuit 6 and a signal output circuit. The LED light source 2 and the optical detector 3 are both arranged in the nasal cavity 4 of the oil mist detection device, light beams emitted by the LED light source 2 penetrate through the oil mist and irradiate the optical detector 3, the optical detector 3 converts optical signals into electric signals, and the current can reflect the oil mist concentration, so that the one-to-one correspondence and the variation relationship between the oil mist concentration and the illumination intensity are formed. The optical detector 3 is connected with a signal input circuit, the signal input circuit is connected with an I/V conversion circuit 5, the I/V conversion circuit 5 is connected with a voltage control type variable gain amplification circuit 6, and the voltage control type variable gain amplification circuit 6 is connected with a signal output circuit. The power module supplies power for the whole device. In this embodiment, the LED light source 2 is a high-brightness and light-focusing infrared LED emitting tube with a wavelength of 880nm and a diameter of 5 mm. The light detector 3 adopts an infrared silicon photocell, the response peak wavelength of the infrared silicon photocell is 900nm, and the response wavelength range is 360 nm-1100 nm.
The utility model discloses marine diesel engine crankcase oil mist detection device's design principle as follows:
according to V/V0＝I(λ)/I0(λ) ═ η, and in this design, I0(lambda) is the light intensity before the irradiating light passes through the oil mist, I (lambda) is the light intensity after the irradiating light passes through the oil mist, V is the voltage value output by the photocell before the oil mist0The voltage output by the photocell after the light passes through the mist is η the transmittance of the incident light in the mist
Can find outValue of oil mist concentration, in this law, μe(λ) is the absorption coefficient, c is the average density of the oil mist, and L is the (optical path) geometric path through which the irradiation light passes through the oil mist.
Further preferably, in the present embodiment, the LED light source 2 is mounted at the inner end of the nasal cavity 4 of the oil mist detection device and located inside the crankcase 1, and the optical detector 3 is mounted at the outer end of the nasal cavity 4 of the oil mist detection device and located outside the crankcase 1.
Referring to fig. 1, the power supply module includes a switching power supply 8 and a three-terminal integrated voltage-stabilized power supply chip 7. The switching power supply 8 provides +24V voltage for the system, and the system is powered through connection with a connector on the system. The photoelectric conversion module 9 requires +5V and-5V voltages, which are provided by three-terminal regulated integrated power chips U298 and U299, respectively. Referring to fig. 4, the three-terminal regulated integrated power supply chip U298 converts the +24V voltage of the switching power supply 8 into a +5V voltage by the first power supply design circuit. Specifically, the input end of a three-terminal integrated stabilized voltage power supply chip U298 in the first power supply design circuit is connected with the switching power supply 8, the GND end is grounded, capacitors C475, C476 and C477 and a voltage stabilizing diode D111 are arranged at two ends of the three-terminal integrated stabilized voltage power supply chip U298, and the capacitors C475, C476 and C477 have the functions of smoothing voltage mutation and filtering ripples. Referring to fig. 5, the three-terminal voltage-stabilizing integrated power supply chip U299 converts the +24V voltage of the switching power supply 8 into the-5V voltage through the second power supply design circuit. Specifically, the input end of the three-terminal integrated voltage-stabilizing power supply chip U299 in the second power supply design circuit is grounded, the GND end is connected with the switching power supply 8, the two ends of the three-terminal integrated voltage-stabilizing power supply chip U299 are provided with capacitors C478, C479, C480 and a zener diode D112, and the capacitors C478, C479 and C480 have the functions of smoothing voltage mutation and filtering ripples. In this embodiment, the three-terminal regulated integrated power supply chips U298 and U299 both employ 78M05 chips.
Referring to fig. 2, the I/V conversion circuit 5 includes an operational amplifier U1, resistors R1, R2, R3, and a capacitor C3, wherein the anode of the infrared silicon photocell P1 is connected between the resistor R2 and the ground to obtain a divided voltage value, the cathode of the infrared silicon photocell P1 is connected to the reverse end of the operational amplifier U1, so that the potential of the cathode point of the infrared silicon photocell P1 is substantially identical to the end of the operational amplifier U1 facing the same direction, and the infrared silicon photocell P1 is in a reverse bias operating state.The resistor R3 is connected with the resistor R2 in parallel and connected with the resistor R1 in series, and the resistor R3 plays a role in increasing the total current; one end of the resistor R1 is connected with the ground, the other end of the resistor R1 is connected with the parallel equivalent resistor of R2 and R3, the resistance value of the resistor R1 is set to be 1K, and the resistor R1 can be adjusted according to requirements to play a role in controlling the bias degree. The infrared silicon photocell P1 converts the optical signal of the concentration of the oil mist into an electric signal and collects the signal current I0And out the 2 nd pin of the operational amplifier U1. The capacitor C3 in parallel with the circuit of the operational amplifier U1 provides interference rejection. The I/V conversion circuit 5 is arranged at the front end of the voltage control type variable gain amplification circuit 6 and is used for converting photo-generated current into voltage. Specifically, the operational amplifier U1 employs an AD 825.
Referring to fig. 3, the voltage controlled variable gain amplifier circuit 6 includes two operational amplifiers U2A and U2B, which include resistors R4, R8, R10, R14, R15, and R16. The resistor R4 is a rheostat with the maximum resistance value of 100K omega, and is connected between the reverse input end and the output end of the operational amplifier U2A; the resistor R10 is a rheostat with the maximum resistance value of 100K omega, and is connected between +5V and-5V; the resistors R8 and R16 are respectively connected between the homodromous input ends of the two operational amplifiers and the ground, R15 is connected between the inverting input end and the output end of the operational amplifier, and R14 is the input resistor of the inverting input end of the operational amplifier. Operational amplifiers U2A and U2B both use LF353, LF353 provides accurate pin selectable gain, the optical path conversion module uses +5V power supply, its power consumption is 125mW, and any intermediate gain range can be obtained by using an external resistor. Through precise calibration, the gain is linear in dB and does not change along with the change of temperature and power supply voltage, and the gain is controlled by high impedance of 50M omega and low bias differential input of 200 nA; its scale factor is 25mV/dB, and only 1V of gain control is needed to control its voltage to obtain the middle 40dB of gain range. Regardless of which gain range is selected, a 1dB over-range, a 1dB under-range is provided. The present system uses single-ended positive voltage for control. The voltage control type variable gain amplifying circuit is used for carrying out linearization processing on the voltage signal U0 and amplifying the voltage signal U0 in one step to reach the range of the input signal required by the LF 353. Under small signals, the multiple of the amplifier is 100 times, and the output voltage of the amplifier can be adjusted by an R4 potentiometer, and is U1. The circuit gain changes with the change of the oil mist concentration, U0 decreases when the concentration increases, and the amplification factor is maximum when the oil mist concentration approaches the set alarm value (because the photocurrent is minimum). When the oil mist concentration is high, the method not only improves the resolution ratio of the oil mist concentration, but also improves the measurement precision. When the oil mist concentration is relatively high, the current signal output by measurement is relatively low, and LF353 is required to perform amplification processing after I/V conversion in order to obtain a proper voltage. R10 is a potentiometer with offset adjustment, and the AC signal is superimposed with DC offset by a subtracter, and the voltage at R9 is U2. To increase the amplification factor output of the module, only the values of the gains R15 and R16 are needed to be used as subtractors, and it must be ensured that:
R7＝R14
R15＝R16
output voltage at Uout calculation formula:
Uout＝R15/R14*(U1-U2)
the embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (7)
1. The marine diesel engine crankcase oil mist detection device is characterized by comprising an oil mist detection device nasal cavity, a photoelectric conversion module and a power supply module; one end of the nasal cavity of the oil mist detection device extends into a crankcase of the diesel engine to be communicated with the crankcase, so that the nasal cavity of the oil mist detection device is filled with oil mist; the photoelectric conversion module comprises an LED light source, a light detector, a signal input circuit, an I/V conversion circuit, a voltage control type variable gain amplification circuit and a signal output circuit; the LED light source and the optical detector are both arranged in the nasal cavity of the oil mist detection device, light beams emitted by the LED light source penetrate through oil mist and irradiate the optical detector, and the optical detector converts optical signals into electric signals; the optical detector is connected with the signal input circuit, the signal input circuit is connected with the I/V conversion circuit, the I/V conversion circuit is connected with the voltage control type variable gain amplification circuit, and the voltage control type variable gain amplification circuit is connected with the signal output circuit; the power module supplies power to the whole device.
2. The marine diesel engine crankcase oil mist detection device according to claim 1, wherein the LED light source is mounted at an inner end of the nasal cavity of the oil mist detection device and located inside the crankcase, and the light detector is mounted at an outer end of the nasal cavity of the oil mist detection device and located outside the crankcase.
3. The marine diesel engine crankcase oil mist detection device according to claim 1, wherein the power supply module comprises a switching power supply and two three-terminal integrated voltage-stabilized power supply chips U298 and U299, the switching power supply provides +24V voltage for the device, the three-terminal voltage-stabilized power supply chip U298 converts the +24V voltage of the switching power supply into +5V voltage through a first power supply design circuit, and the three-terminal voltage-stabilized power supply chip U299 converts the +24V voltage of the switching power supply into-5V voltage through a second power supply design circuit.
4. The marine diesel engine crankcase oil mist detection device according to claim 3, characterized in that an input end of a three-terminal integrated voltage-stabilized power supply chip U298 in the first power supply design circuit is connected with a switching power supply, a GND end is grounded, two ends of the three-terminal integrated voltage-stabilized power supply chip U298 are provided with capacitors C475, C476 and C477 and a zener diode D111, and the capacitors C475, C476 and C477 have the functions of smoothing voltage sudden change and filtering ripples; the input end of the three-end integrated stabilized voltage power supply chip U299 in the second power supply design circuit is grounded, the GND end is connected with the switching power supply, two ends of the three-end integrated stabilized voltage power supply chip U299 are provided with capacitors C478, C479, C480 and a voltage stabilizing diode D112, and the capacitors C478, C479 and C480 have the functions of smoothing voltage mutation and filtering ripples.
5. The marine diesel engine crankcase oil mist detection device according to claim 1, wherein the LED light source is an infrared LED emission tube; the optical detector is an infrared silicon photocell.
6. The marine diesel engine crankcase oil mist detection device according to claim 5, wherein the I/V conversion circuit comprises an operational amplifier U1, a resistor R1, a resistor R2, a resistor R3 and a capacitor C3, wherein the anode of the infrared silicon photocell is connected between the resistor R2 and the ground to obtain a voltage division value, the cathode of the infrared silicon photocell is connected to the reverse end of the operational amplifier U1, so that the potential of the cathode point of the infrared silicon photocell is basically consistent with the same-direction end of the operational amplifier U1, and the infrared silicon photocell is in a reverse bias working state; the resistor R3 is connected with the resistor R2 in parallel and connected with the resistor R1 in series, and the resistor R3 plays a role in increasing the total current; one end of the resistor R1 is connected with the ground, the other end of the resistor R1 is connected with the parallel equivalent resistor of R2 and R3, and R1 plays a role in controlling the bias degree; the infrared silicon photocell converts an optical signal penetrating through the oil mist concentration into an electric signal and converts the collected signal current I0The capacitor C3 connected in parallel with the circuit of the operational amplifier U1 is connected to the 2 nd pin of the operational amplifier U1 for interference rejection.
7. The marine diesel engine crankcase oil mist detection device according to claim 1, wherein the voltage control type variable gain amplification circuit comprises two operational amplifiers U2A and U2B, including resistors R4, R8, R10, R14, R15, R16; the resistor R4 is a rheostat with the maximum resistance value of 100K omega, and is connected between the reverse input end and the output end of the operational amplifier U2A; the resistor R10 is a rheostat with the maximum resistance value of 100K omega, and is connected between +5V and-5V; the resistors R8 and R16 are respectively connected between the homodromous input ends of the two operational amplifiers and the ground, R15 is connected between the inverting input end and the output end of the operational amplifier, and R14 is the input resistor of the inverting input end of the operational amplifier.
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| CN201921111774.6U CN210803208U (en) | 2019-07-16 | 2019-07-16 | Marine diesel engine crankcase oil mist detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112924340A (en) * | 2021-02-09 | 2021-06-08 | 西安理工大学 | Atmospheric aerosol particulate matter classification detection system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924340A (en) * | 2021-02-09 | 2021-06-08 | 西安理工大学 | Atmospheric aerosol particulate matter classification detection system |
| CN112924340B (en) * | 2021-02-09 | 2024-02-20 | 西安理工大学 | Atmospheric aerosol particulate classification detecting system |
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