Light scattering oil mist detector

Abstract

The invention discloses an oil mist concentration detector, which belongs to the technical field of oil mist concentration detection, and comprises a shell, a flue, a light source, a photoelectric detector, a main control circuit board and two end covers, the flue is arranged in the shell; the two end covers are arranged at openings in the two ends of the shell respectively. Each end cover is provided with an air vent, and the air vents of the end covers are opposite to the openings in the two ends of the flue; the light source is arranged on the flue and emits light beams into the flue; the photoelectric detector is arranged on the flue and is used for receiving scattered light and outputting an electric signal; the main control circuit board is arranged on the outer side wall of the flue and located between the outer side wall of the flue and the inner side wall of the shell. The main control circuit board is electrically connected with the light source and the photoelectric detector. The oil mist concentration detection function is achieved through the light scattering method, the oil mist concentration can be detected in real time through the method, and the structure is simple, stable and reliable.

Description

Technical Field

[0001] The invention belongs to the technical field of oil mist concentration detection, and particularly relates to a light scattering oil mist detector. Background Art

[0002] During the operation of engines, transmissions and other equipment, oil mist will be generated due to frictional heat, operational failures and other reasons. When the oil mist concentration reaches a certain level, an explosion will occur. Therefore, the oil mist concentration needs to be monitored in real time in the working space of engines, transmissions and other equipment.

[0003] Light scattering is a technology that uses the scattering effect of oil mist particles on a light beam to detect oil mist concentration. Compared with other oil mist detection methods such as weighing, polarization, and opacity, light scattering has the advantages of good real-time performance, high accuracy, and moderate economy.

[0004] In the existing technology, the oil mist air duct and the detector control module share the same closed chamber, resulting in a complex structure and cumbersome assembly. The entire module needs to be disassembled for maintenance, which can easily cause oil mist residue to contaminate electronic components, increasing maintenance difficulty and the risk of failure. Summary of the Invention

[0005] In view of this, the present invention provides a light scattering oil mist detector, which uses a light scattering method to realize the oil mist concentration detection function. This method can detect the oil mist concentration in real time, and has a simple structure, stability and reliability.

[0006] The present invention is achieved through the following technical solutions:

[0007] A light scattering oil mist detector comprises: a housing, a flue, a light source, a photoelectric detector, a main control circuit board and two end covers;

[0008] The flue is arranged in the housing;

[0009] The two end covers are respectively arranged at the two end openings of the shell; each end cover is provided with an air vent, and the air vent of the end cover is opposite to the two end openings of the flue;

[0010] The light source is arranged on the flue and emits a light beam into the flue;

[0011] The photoelectric detector is arranged on the flue and is used to receive scattered light and output an electrical signal;

[0012] The main control circuit board is arranged on the outer wall of the flue, and is located between the outer wall of the flue and the inner wall of the shell; the main control circuit board is electrically connected to the light source and the photodetector respectively.

[0013] Furthermore, the axis of the light-emitting window of the light source passes through the geometric center of the flue;

[0014] The axis of the detection window of the photoelectric detector passes through the geometric center of the flue;

[0015] The axis of the detection window and the axis of the light emitting window are coplanar and perpendicular to each other.

[0016] Furthermore, the main control circuit board includes: a power distribution module and a signal processing module; the power distribution module is electrically connected to the light source and the photodetector; the signal processing module is electrically connected to the photodetector, receives the electrical signal, and converts the electrical signal into oil mist concentration data.

[0017] Furthermore, it also includes: a fan;

[0018] The fan is arranged at the outlet of the flue;

[0019] When the fan rotates, negative pressure is formed in the flue.

[0020] Furthermore, each of the end cover vents is a louver hole.

[0021] Furthermore, the flue is fixed in the shell through two end covers.

[0022] Further, it also includes: a cable connector;

[0023] The cable connector is provided on an end cap;

[0024] The cable connectors are electrically connected to the power distribution module and the signal processing module respectively.

[0025] Beneficial effects:

[0026] (1) In the light scattering oil mist detector of the present invention, the light source, photoelectric detector and main control circuit board are all arranged on the flue. This integrated design simplifies the overall structure, making the oil mist detector compact and easy to assemble and maintain. The internal space of the flue is separated from the internal space of the shell, which can protect the main control circuit board located between the outer wall of the flue and the inner wall of the shell from erosion by oil mist air, extend its service life, and ensure the stability and reliability of the detection results.

[0027] (2) In a light scattering oil mist detector of the present invention, the axis of the light emitting window and the axis of the detection window are coplanar and perpendicular to each other, making the measurement result more accurate.

[0028] (3) In a light scattering oil mist detector of the present invention, a fan is arranged at the outlet of the flue. When the fan rotates, negative pressure is formed in the flue, which can suck the oil mist air into the flue, thereby improving the detection efficiency.

[0029] (4) In a light scattering oil mist detector of the present invention, the vents of each end cover are louver holes, which can control the direction of air flow, adjust the air flow speed, turbulence and optimize the air flow distribution, thereby ensuring the accuracy and reliability of oil mist detection.

[0030] (5) In a light scattering oil mist detector of the present invention, the flue is fixed in the housing by two end covers to prevent the flue from shaking and affecting the measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present invention;

[0032] Among them, 1-cable connector, 2-photoelectric detector, 3-light source, 4-fan, 5-base, 6-fixing bolt, 7-smoke duct, 8-cover A, 9-housing, 10-main control circuit board, 11-cover B. DETAILED DESCRIPTION

[0033] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0034] This embodiment provides a light scattering oil mist detector, such as Figure 1 As shown, it includes: a housing 9, a flue 7, a light source 3, a photoelectric detector 2, a fan 4, a main control circuit board 10, two end covers, a cable connector 1 and a base 5;

[0035] The housing 9 is open at both ends;

[0036] The flue 7 serves as a flow channel for oil mist and is used for oil mist detection. The flue 7 is installed on the inner wall of the housing 9, and the opening directions of the two ends of the flue 7 are consistent with the opening direction of the housing 9. One end of the flue 7 is an inlet and the other end is an outlet. The oil mist enters the flue 7 through the inlet and flows out through the outlet.

[0037] The light source 3 is mounted on the wall of the flue 7; the axis of the light-emitting window of the light source 3 passes through the geometric center of the flue 7;

[0038] The photoelectric detector 2 is mounted on the upper wall of the flue 7; the axis of the detection window of the photoelectric detector 2 passes through the geometric center of the flue 7; the axis of the detection window and the axis of the light emitting window are coplanar and perpendicular to each other;

[0039] The fan 4 is installed on the inner wall of the flue 7 and is located at the outlet of the flue 7. When the fan 4 rotates, a negative pressure is formed in the flue 7, and the oil mist air is sucked into the flue 7.

[0040] The main control circuit board 10 is mounted on the outer wall of the flue 7 through a bracket and is located between the outer wall of the flue 7 and the inner wall of the housing 9; the main control circuit board 10 includes: a power supply interface, a communication interface, a power distribution module and a signal processing module; the power supply structure is used to connect to an external power supply system; the communication interface is used to connect to an external host computer; the power distribution module is electrically connected to the power supply interface, the light source 3, the fan 4 and the photodetector 2 respectively, and the power provided by the external power supply system is transmitted to the power distribution module and distributed to the light source 3, the fan 4 and the photodetector 2 to realize power supply; the signal processing module is electrically connected to the communication interface and the photodetector 2 respectively; the signal processing module receives the electrical signal output by the photodetector 2, and converts the electrical signal into oil mist concentration data, and finally transmits it to the host computer through the communication interface for further processing and display;

[0041] As an example, louvers are provided on both end covers. The louver holes serve as vents for gas in and out. The louver holes can control the direction of airflow, adjust the airflow speed, and shield the influence of external ambient light on oil mist concentration detection, thereby ensuring the accuracy and reliability of oil mist detection.

[0042] A groove for mounting a sealing ring is provided at the edge of the louver on the end cover, corresponding to the interface between the end cover and the flue 7. An indicator light is provided on the front end cover, and a terminal block is provided on the rear end cover. The two end covers are mounted at the two end openings of the housing 9, securing the flue 7 within the housing 9. The vents of the two end covers correspond to the inlet and outlet of the flue 7, respectively. The end cover at the outlet of the flue 7 is designated as cover B11, and the end cover at the inlet of the flue 7 is designated as cover A8.

[0043] The cable connector 1 is installed at the unprocessed louver hole on the cover B11; the power supply structure and communication interface of the main control circuit board 10 are connected to the external power supply system and communication system respectively through the cable connector 1, thereby realizing the transmission of power supply and oil mist concentration data;

[0044] The base 5 is mounted on the outer wall of the housing 9 for mounting the oil mist detector. In this embodiment, the base 5 is fixed to the housing 9 by fixing bolts 6 .

[0045] Working principle:

[0046] After the oil mist detector is connected to the power supply and communication cables, it is powered on and the fan 4 starts to rotate. When the fan 4 rotates, the air flow rate in the flue 7 accelerates, forming a negative pressure. At this time, the oil mist air outside the oil mist detector is sucked into the flue 7 through the cover A8. The light source 3 emits a light beam after being powered on. When the light beam emitted by the light source 3 irradiates the oil mist air in the flue 7, the light beam is scattered by the oil mist particles, forming scattered light. The scattered light is received by the photodetector 2 and converted into an electrical signal. The electrical signal is transmitted to the signal processing module of the main control circuit board 10. The electrical signal is converted into oil mist concentration data through the calculation of the signal processing module. The oil mist concentration data is transmitted to the host computer through the communication connector and the cable connector 1, thereby realizing oil mist detection. The oil mist entering the flue 7 is discharged through the fan 4 and the cover B11.

[0047] The host computer can judge the oil mist concentration; when the oil mist concentration data reaches the limit, the host computer commands the alarm to output an alarm signal.

[0048] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A light scattering oil mist detector, characterized in that: include: A housing (9), a flue (7), a light source (3), a photoelectric detector (2), a main control circuit board (10) and two end covers; The flue (7) is arranged in the housing (9); The two end covers are respectively arranged at the two end openings of the housing (9); each end cover is provided with an air vent, and the air vent of the end cover is opposite to the two end openings of the flue (7); The light source (3) is arranged on the flue (7) and emits a light beam into the flue (7); The photoelectric detector (2) is arranged on the flue (7) and is used to receive scattered light and output an electrical signal; The main control circuit board (10) is arranged on the outer wall of the flue (7) and is located between the outer wall of the flue (7) and the inner wall of the housing (9); the main control circuit board (10) is electrically connected to the light source (3) and the photodetector (2), respectively.

2. A light scattering oil mist detector as claimed in claim 1, characterized in that: The axis of the light-emitting window of the light source (3) passes through the geometric center of the flue (7); The axis of the detection window of the photoelectric detector (2) passes through the geometric center of the flue (7); The axis of the detection window and the axis of the light emitting window are coplanar and perpendicular to each other.

3. The light scattering oil mist detector according to claim 1, characterized in that: The main control circuit board (10) comprises: a power distribution module and a signal processing module; the power distribution module is electrically connected to the light source (3) and the photodetector (2); the signal processing module is electrically connected to the photodetector (2), receives an electrical signal, and converts the electrical signal into oil mist concentration data.

4. The light scattering oil mist detector according to claim 1, characterized in that: Also includes: Fan (4); The fan (4) is arranged at the outlet of the flue (7); When the fan (4) rotates, negative pressure is formed in the flue (7).

5. The light scattering oil mist detector according to claim 1, characterized in that: Each of the end cover vents is a louver hole.

6. The light scattering oil mist detector according to claim 1, characterized in that: The flue (7) is fixed in the outer shell (9) via two end covers.

7. A light scattering oil mist detector according to any one of claims 1 to 6, characterized in that: Also included: a cable connector (1); The cable connector (1) is arranged on an end cover; The cable connector (1) is electrically connected to the power distribution module and the signal processing module respectively.

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