Air suction type oil mist detector

Abstract

The invention provides an air suction type oil mist detector. The air suction type oil mist detector comprises a shell, a flue, a sampling pipeline, a fan and a detection assembly, the flue is arranged in the shell, the fan is arranged in the flue and used for forming negative pressure to suck oil mist gas, the sampling pipeline is arranged at the bottom of the shell and communicated with the flue, the outer end face of the sampling pipeline is closed, and two or more through holes are formed in the lower portion of the sampling pipeline. The detection assembly is used for detecting the concentration of oil mist gas in the flue. According to the invention, the oil mist concentration in the crankcase of the marine diesel engine can be reliably detected on line in real time.

Description

Technical Field

[0001] This invention relates to the field of oil mist concentration detection technology, and specifically to an aspirating oil mist detector. Background Technology

[0002] As the core power equipment of a ship, the operational reliability of the marine diesel engine directly affects the ship's navigation safety and operational efficiency. Under normal operating conditions, the crankcase of the diesel engine is in a relatively stable, enclosed environment. Moving parts within the case, such as the crankshaft, connecting rods, and crosshead, operate with sufficient lubrication. The frictional heat generated is essentially balanced with the heat removed by the cooling system, maintaining the internal temperature of the crankcase within a reasonable range. Under these conditions, the concentration of splashed or atomized lubricating oil is low and fluctuates gently, typically well below the lower explosive limit of flammable materials, thus ensuring overall operational safety.

[0003] However, when critical moving parts within the crankcase experience increased friction due to abnormal wear, breakage, or seizing, or when piston ring seals fail, cylinder liner wear causes high-temperature combustion gases to leak downwards, or when the cooling system's efficiency decreases or fails, the thermal balance inside the crankcase is rapidly disrupted. Heat accumulates dramatically within the case, leading to an abnormally high internal temperature. This high-temperature environment causes residual lubricating oil droplets and oil films adhering to the case walls and component surfaces to evaporate rapidly, forming a high-concentration mixture of flammable oil mist within the case.

[0004] Once the concentration of this oil mist mixture continues to rise and reaches its explosive limit, it can easily ignite spontaneously or even explode violently in the presence of a high-temperature heat source (such as the surface of an overheated component) or mechanical sparks (such as a component breakage collision). A crankcase explosion generates extremely high pressure and shock waves, which may cause the crankcase door to be blown open, the case to rupture, leading to fire, secondary mechanical damage, and even endangering the overall safety of the engine room, causing serious loss of life and property and environmental pollution.

[0005] Therefore, there is a need for a real-time, accurate, and reliable instrument for detecting the oil mist concentration inside the crankcase of a marine diesel engine. Summary of the Invention

[0006] In view of this, the present invention provides an air-breathing oil mist detector that can reliably detect the oil mist concentration inside the crankcase of a marine diesel engine in real time, online.

[0007] The technical solution adopted in this invention is as follows: An aspirating oil mist detector includes a housing, a flue, a sampling pipeline, a fan, and a detection component; The flue is located inside the housing, and the fan is located inside the flue to create negative pressure to draw in oil mist gas. The sampling pipeline is located at the bottom of the housing and is connected to the flue. The outer end face of the sampling pipeline is closed, and two or more through holes are opened at the bottom. The detection component is used to detect the concentration of oil mist gas in the flue.

[0008] Furthermore, the detection component includes a light source, a photodetector, a main control circuit board, and an electrical connector; The light source is installed on the flue and is used to emit a beam of light to illuminate the oil mist air, which is then scattered by the oil mist particles to form scattered light; the photodetector is used to collect the scattered light and convert it into an electrical signal; the main control circuit board is used to receive the electrical signal and process it into oil mist concentration data; the electrical connector is used to upload the oil mist concentration data to an external host computer.

[0009] Furthermore, the sampling pipeline includes an inlet and outlet air pipe, a mounting screw, and an oil-proof cover; One end of the mounting screw is threaded to the housing, and the other end is fixedly connected to the oil shield; the mounting screw is used to fix the diesel engine crankcase wall. The inlet and outlet pipes are provided with two channels, both of which are connected to the flue. The inlet and outlet pipes are fitted into the mounting screws. The two ends of the inlet and outlet pipes are axially limited by the limiting platform on the inner wall of the shell and the end face of the oil-proof cover, respectively. The outer end face of the oil-proof cover is closed, and two or more through holes are opened at the bottom.

[0010] Furthermore, the open end of the oil-proof cover is provided with an annular groove that penetrates the end face, the end face of the annular groove abuts against the end of the mounting screw, and the annular groove is bonded to the end of the mounting screw.

[0011] Furthermore, the oil-proof cover has three through holes. Through hole I is located at the bottom, and the other two through holes II are located on the lower side and are symmetrical about the bottom through hole I. The two through holes II and through hole I are located on different circumferential surfaces.

[0012] Beneficial effects: 1. This invention uses a fan and sampling pipeline to draw oil mist-containing gas into the flue, and the detection component enables real-time, online detection of oil mist concentration in the crankcase of a marine diesel engine. It has a simple structure and is stable and reliable.

[0013] 2. The detection component of this invention utilizes the light scattering effect to achieve rapid response and accurate detection of oil mist concentration, and can sensitively capture subtle changes in concentration to ensure detection reliability.

[0014] 3. The outer end face of the oil shield of the present invention is closed, and two or more through holes are opened at the bottom. While meeting the air intake and exhaust requirements, it can prevent the lubricating oil in the crankcase from splashing in and blocking the air intake and exhaust pipes. Attached Figure Description

[0015] Figure 1 This is a perspective view of the overall structure of the present invention.

[0016] Figure 2 This is a cross-sectional view of the overall structure of the present invention.

[0017] Among them, 1-electrical connector, 2-main control circuit board, 3-flue, 4-fan, 5-main housing, 6-inlet and outlet air pipes, 7-mounting screw, 8-oil cover, 9-photoelectric detector, 10-light source, 11-top cover. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] This invention provides an aspirating oil mist detector, including a housing, a flue 3, a sampling pipe, a fan 4, and a detection component, such as... Figure 1 As shown.

[0020] The flue 3 is located inside the housing, and the fan 4 is located inside the flue 3 to create negative pressure to draw in oil mist gas. The sampling pipeline is located at the bottom of the housing and is connected to the flue 3. The outer end face of the sampling pipeline is closed, and two or more through holes are opened at the bottom. The detection component is used to detect the concentration of oil mist gas in the flue 3.

[0021] In this embodiment, the detection component realizes the detection of oil mist concentration based on the light scattering effect. The detection component includes a light source 10, a photodetector 9, a main control circuit board 2, and an electrical connector 1.

[0022] The light source 10 is set on the flue 3 to emit a beam of light that shines on the oil mist air and is scattered by the oil mist particles to form scattered light; the photodetector 9 is used to collect the scattered light and convert it into an electrical signal; the main control circuit board 2 is used to receive the electrical signal and process it into oil mist concentration data; the electrical connector 1 is used to upload the oil mist concentration data to an external host computer.

[0023] The housing is a split-type structure, including an upper cover 11 and a main housing 5. The upper cover 11 closes the top of the main housing 5, and the electrical connector 1 is installed in the middle of the top surface of the upper cover 11. The main control circuit board 2 is located in the upper part of the main housing 5, and the flue 3 is located below the main housing 5.

[0024] Specifically, the sampling pipeline includes an inlet / outlet pipe 6, a mounting screw 7, and an oil shield 8; one end of the mounting screw 7 is threadedly connected to the housing, and the other end is fixedly connected to the oil shield 8; the mounting screw 7 is fixedly connected to the diesel engine crankcase wall through the threads on its outer periphery, and the oil shield 8 extends into the diesel engine crankcase.

[0025] The inlet and outlet pipe 6 has two channels, both of which are connected to the flue 3 to form a loop (inlet and outlet). The inlet and outlet pipe 6 is fitted into the mounting screw 7. The two ends of the inlet and outlet pipe 6 are axially limited by the limiting platform on the inner wall of the housing and the end face of the oil cover 8, respectively. The outer end face of the oil cover 8 is closed, and two or more through holes are opened at the bottom.

[0026] The open end of the oil-proof cover 8 is provided with an annular groove that penetrates the end face. The end face of the annular groove abuts against the end of the mounting screw 7, and the annular groove is bonded to the end of the mounting screw 7.

[0027] In this embodiment, the oil shield 8 has three through holes. Through hole I is located at the bottom, and the other two through holes II are located on the lower side and are symmetrical about the bottom through hole I. The two through holes II and through hole I are located on different circumferential surfaces. The oil shield 8 can meet the air intake and exhaust requirements while preventing lubricating oil in the crankcase from splashing in and clogging the air intake and exhaust pipes 6. like Figure 2 As shown, during operation, fan 4 blows air out from the lower channel of inlet / outlet pipe 6 through the three-way holes (through hole I and two through holes II) on oil shield 8, creating negative pressure in flue 3. This draws oil-mist-laden air into flue 3 through the through holes on oil shield 8 and the upper channel of inlet / outlet pipe 6. Conversely, the drawn-in oil-mist-laden air also enters flue 3 through the lower channel. Light source 10 on flue 3 emits a beam of light that illuminates the oil-mist-laden air. The light is scattered by oil mist particles, forming scattered light. Photodetector 9 collects the scattered light and converts it into an electrical signal. This signal is transmitted to the main control circuit board 2, processed, and converted into oil mist concentration data, which is then uploaded to the host computer via electrical connector 1.

[0028] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A suction-type oil mist detector, characterized in that, Includes housing, flue, sampling pipeline, fan, and detection components; The flue is located inside the housing, and the fan is located inside the flue to create negative pressure to draw in oil mist gas. The sampling pipeline is located at the bottom of the housing and is connected to the flue. The outer end face of the sampling pipeline is closed, and two or more through holes are opened at the bottom. The detection component is used to detect the concentration of oil mist gas in the flue.

2. The aspirating oil mist detector as described in claim 1, characterized in that, The detection component includes a light source, a photodetector, a main control circuit board, and an electrical connector; The light source is installed on the flue and is used to emit a light beam that illuminates the oil mist air, which is then scattered by the oil mist particles to form scattered light; the photodetector is used to collect the scattered light and convert it into an electrical signal; the main control circuit board is used to receive the electrical signal and process it into oil mist concentration data. The electrical connector is used to upload the oil mist concentration data to an external host computer.

3. The aspirating oil mist detector as described in claim 1, characterized in that, The sampling pipeline includes an inlet and outlet air pipe, a mounting screw, and an oil-proof cover; One end of the mounting screw is threaded to the housing, and the other end is fixedly connected to the oil shield; the mounting screw is used to fix the diesel engine crankcase wall. The inlet and outlet pipes are provided with two channels, both of which are connected to the flue. The inlet and outlet pipes are fitted into the mounting screws. The two ends of the inlet and outlet pipes are axially limited by the limiting platform on the inner wall of the shell and the end face of the oil-proof cover, respectively. The outer end face of the oil-proof cover is closed, and two or more through holes are opened at the bottom.

4. The aspirating oil mist detector as described in claim 3, characterized in that, The open end of the oil-proof cover is provided with an annular groove that penetrates the end face. The end face of the annular groove abuts against the end of the mounting screw, and the annular groove is bonded to the end of the mounting screw.

5. The aspirating oil mist detector as described in claim 3 or 4, characterized in that, The oil-proof cover has three through holes. Through hole I is located at the bottom, and the other two through holes II are located on the lower side and are symmetrical about the bottom through hole I. The two through holes II and through hole I are located on different circumferential surfaces.

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