A centrifugal rotary disc diesel engine exhaust smoke detection device with precise air pressure control

Abstract

The invention discloses a pneumatic precision-controlled centrifugal turntable diesel engine exhaust smoke detection device, comprising an outer shell, a detection turntable is distributed inside the outer shell, the detection turntable is driven by a servo motor, and the servo motor is combined with the outer shell; a circle of transparent circles are respectively provided on the upper and lower disk surfaces of the detection turntable; a detection chamber and a light source head chamber are respectively distributed on the outside of the transparent circles; the detection chamber and the light source head chamber are combined with the outer shell; a smoke inlet pipe is combined in the middle of the lower disk of the detection turntable, and the smoke inlet pipe is connected by a rotating shaft; fan blades are distributed at a circle of air outlets on the outer edge of the detection turntable. The invention can realize rotary and controllable smoke detection.

Description

Technical Field

[0001] The invention relates to the technical field of accurate detection of diesel engine smoke, and in particular to an air pressure precise controlled centrifugal turntable type diesel engine exhaust smoke detection device. Background Art

[0002] When the engine leaves the factory, it is necessary to test the smoke emission of the engine. The current engine smoke emission test is highly susceptible to interference and has low accuracy. Especially for diesel engines, the cylinder stroke reciprocates, which causes the exhaust to be unstable. Therefore, the existing device has large fluctuations in detection and cannot accurately detect.

[0003] The disclosure of the above background technology content is only used to assist in understanding the concept and technical solution of the present invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Summary of the invention

[0004] In view of the above technical problems, the present invention provides a centrifugal turntable type smoke detection device with precise control for diesel engines.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A pneumatic precision-controlled centrifugal turntable diesel engine exhaust smoke detection device comprises an outer shell, a detection turntable is distributed inside the outer shell, the detection turntable is driven by a servo motor, and the servo motor is combined with the outer shell; a circle of transparent circles are respectively provided on the upper and lower disk surfaces of the detection turntable; a detection chamber and a light source head chamber are respectively distributed on the outside of the transparent circles; the detection chamber and the light source head chamber are combined with the outer shell; a smoke inlet pipe is combined in the middle of the lower disk of the detection turntable, and the smoke inlet pipe is connected through a rotating shaft; fan blades are distributed at a circle of air outlets on the outer edge of the detection turntable.

[0007] Furthermore, the transparent circles are distributed on the upper and lower disk surfaces of the detection turntable at a radius of 1 / 3 of the center of the circle.

[0008] Furthermore, an annular air pressure regulating chamber is correspondingly provided on the outer shell; and a plurality of air outlets and an electrically controlled valve are provided on the upper part of the air pressure regulating chamber.

[0009] Furthermore, heating plates are correspondingly provided on the upper and lower surfaces of the detection turntable to heat the flue gas at a constant temperature.

[0010] Furthermore, a heating window is installed on the lower side of the detection chamber, and a first heating window heater is provided on the upper side of the heating window. A first heater power head is installed corresponding to the first heating window heater to supply power to the first heating window heater; a thermal isolation plate, an optical lens, a light detector and a light detector power head are also distributed in sequence on the upper part of the detection chamber.

[0011] Furthermore, a heating window is also installed on the upper side of the light source head chamber, and a second heating window heater is provided on the lower side of the heating window; a second heater power head is installed corresponding to the second heating window heater to supply power to the second heating window heater; a halogen light-emitting lamp and a halogen light-emitting lamp power head are installed at the lower part of the light source head chamber; and a smoke density calibration plate is also installed above the halogen light-emitting lamp, which is used for inserting the card when calibrating the smoke density.

[0012] Furthermore, a temperature sensing element and an air pressure sensitive element are also provided in the air pressure regulating chamber.

[0013] Furthermore, two circles of concentric circle slots are provided on the inner side of the upper disk surface of the detection turntable, and an airbag slot is provided between the two circles of concentric circle slots; elastic vibration damping plates are correspondingly distributed on the concentric circle slots; the elastic vibration damping plate is circular when viewed from above, and two concentric circle convex blocks are correspondingly provided on its upper plate surface; spring hooks are correspondingly provided on the concentric circle convex blocks; the elastic vibration damping plate is suspended on the upper disk surface of the detection turntable by springs; a pressure-regulating airbag is also distributed in the airbag slot, and the pressure-regulating airbag is provided with a valve nozzle.

[0014] The beneficial effects of the present invention compared with the prior art are as follows:

[0015] (1) The present invention detects the smoke drawn in from the center by using a rotating disk with a servo motor to control the speed, which can achieve adjustable speed and thus achieve the optimal speed for controlling the smoke detection of different types of diesel engines (this depends on the smoke concentration in the disk and the smoke stability problem).

[0016] (2) The transparent ring is distributed on the upper and lower disk surfaces of the detection turntable at a radius of 1 / 3 of the center of the circle, which can significantly reduce the error of smoke flow movement.

[0017] (3) After the flue gas is drawn in from the center, it can achieve 360-degree exhaust to improve the uniformity and stability of the flue gas flow and ensure the stability of the test value.

[0018] (4) The present invention provides a heating plate and a temperature sensing element on the upper cover and the lower cover of the detection disc, so as to timely keep the smoke in the detection disc constant within a certain temperature range, thereby reducing the problem of the influence of the difference in smoke temperature at the common smoke end of different models / machines on the detection result.

[0019] (5) The light source head chamber is equipped with a smoke calibration plate to achieve regular calibration and adjustment to improve detection accuracy.

[0020] (6) By providing an elastic vibration damping plate, the entire turntable can be rotated at high speed to ensure the smoothness of the overall operation. High-speed rotation can effectively reduce the sedimentation of solid smoke particles, improve the stability of the smoke airflow in the disk, and significantly improve the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a cutaway view of the present invention;

[0022] Figure 2 is a cross-sectional view of the elastic vibration damping plate of the present invention;

[0023] Figure 3 It is a structural schematic diagram of the light source head chamber of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the detector chamber of the present invention. DETAILED DESCRIPTION

[0025] like Figures 1 to 4As shown, a pneumatic precision-controlled centrifugal turntable diesel engine exhaust smoke detection device includes an outer shell 2, a detection turntable 1 is distributed inside the outer shell 2, and the detection turntable 1 is driven by a servo motor 7, and the servo motor 7 is combined with the outer shell 2; a circle of transparent circles 1-6, 1-5 are respectively provided on the upper and lower disk surfaces of the detection turntable 1; corresponding to the transparent circles, a detection chamber 9 and a light source head chamber 11 are respectively distributed on the outside thereof; the detection chamber and the light source head chamber are combined with the outer shell 2; a smoke inlet pipe 10 is combined in the middle of the lower disk of the detection turntable, and the smoke inlet pipe is connected by a rotating shaft 8; a circle of air outlets 1-2 on the outer edge of the detection turntable are distributed with fan blades 1-3, that is, the exhaust function is realized by a circle of the fan blades 1-3. The transparent circles are distributed at a radius of 1 / 3 from the center of the circle on the upper and lower disk surfaces of the detection turntable. The outer shell 2 is provided with a corresponding annular air pressure regulating chamber 2-3; the upper part of the air pressure regulating chamber is provided with a plurality of air outlets 2-4 and an electric control valve 2-5, and the upper and lower disc surfaces of the detection turntable are also provided with a heating disc 12, which plays a role in constant temperature heating of the smoke. The air pressure regulating chamber is also provided with a temperature sensing element and an air pressure sensitive element. The electric control valve, servo motor, heating disc, temperature sensing element, etc. of this embodiment are connected with the control circuit, and are used to determine the relevant parameters when a certain type of machine is detected. For example, after a certain machine adjusts its speed to a certain number of revolutions, by determining different servo motor speeds, different heating disc constant temperatures, and how many electric control valves 2-5 are kept open to maintain different air pressure values ​​in the air pressure regulating chamber, the highest detection accuracy is determined. After the best servo motor speed, the best heating disc constant temperature, and how many electric control valves 2-5 to be opened for this type of machine are determined by experiment, all machines of this type are then accurately detected according to these parameters. A heating window 9-7 is installed on the lower side of the detection chamber 9, and a first heating window heater 9-6 is installed on the upper side of the heating window. A first heater power supply head 9-5 is installed corresponding to the first heating window heater to supply power to the first heating window heater; a thermal isolation sheet 9-4, an optical lens 9-3, a light detector 9-2 and a light detector power supply head 9-1 are also distributed in sequence on the upper part of the detection chamber 9. A heating window 11-1 is also installed on the upper side of the light source head chamber 11, and a second heating window heater 11-2 is installed on the lower side of the heating window; a second heater power supply head 11-3 is installed corresponding to the second heating window heater to supply power to the second heating window heater; a halogen light emitting lamp 11-6 and a halogen light emitting lamp power supply head 11-5 are installed on the lower part of the light source head chamber; and a smoke density calibration sheet 11-4 is installed above the halogen light emitting lamp, which is used for inserting the card when calibrating the smoke density.

[0026] To ensure that the detection turntable 1 can perform high-speed rotation detection, the inner side of the upper disk surface of the detection turntable 1 of this embodiment is further provided with two circles of concentric circle slots 2-1, and an airbag slot 2-2 is provided between the two circles of concentric circle slots; an elastic vibration damping plate 3 is correspondingly distributed on the concentric circle slots; the elastic vibration damping plate 3 is circular when viewed from above, and its upper plate surface is correspondingly provided with two concentric circle convex blocks 3-1; the concentric circle convex blocks 3-1 are correspondingly provided with spring hooks 3-2, 3-3; the elastic vibration damping plate is suspended on the upper disk surface of the detection turntable by a spring 5; a pressure-regulating airbag 4 is also distributed in the airbag slot, and the pressure-regulating airbag is provided with a valve 6, and elastic adjustment is achieved by adding air or deflating air (the spring 5 pulls the elastic vibration damping plate 3 upward, and the expansion and contraction of the pressure-regulating airbag 4 affects the expansion and contraction of the elastic vibration damping plate 3 up and down).

Claims

1. A pneumatic precision-controlled centrifugal turntable diesel engine exhaust smoke detection device, Features: It comprises an outer shell, a detection turntable is distributed inside the outer shell, the detection turntable is driven by a servo motor, and the servo motor is combined with the outer shell; a circle of transparent circles are respectively arranged on the upper and lower disk surfaces of the detection turntable; a detection chamber and a light source head chamber are respectively distributed outside the transparent circles; the detection chamber and the light source head chamber are combined with the outer shell; a smoke inlet pipe is combined in the middle of the lower disk of the detection turntable, and the smoke inlet pipe is connected through a rotating shaft; fan blades are distributed at a circle of air outlets on the outer edge of the detection turntable; The transparent rings are distributed on the upper and lower disk surfaces of the detection turntable at a distance of 1 / 3 of the radius from the center of the circle; The outer shell is provided with an annular air pressure regulating chamber; the upper part of the air pressure regulating chamber is provided with a plurality of air outlets and an electric control valve; The upper and lower surfaces of the detection turntable are also provided with heating disks to heat the flue gas at a constant temperature; The air pressure regulating chamber is also provided with a temperature sensing element and an air pressure sensitive element.

2. According to claim 1, a pneumatic precision-controlled centrifugal turntable diesel engine exhaust smoke detection device, Features: A heating window is installed on the lower side of the detection chamber, and a first heating window heater is provided on the upper side of the heating window. A first heater power supply head is installed corresponding to the first heating window heater to supply power to the first heating window heater; a thermal isolation sheet, an optical lens, a light detector and a light detector power supply head are also distributed in sequence on the upper part of the detection chamber.

3. According to claim 1, a centrifugal disc type diesel engine exhaust smoke detection device with air pressure precision control, Features: A heating window is also installed on the upper side of the light source head chamber, and a second heating window heater is provided on the lower side of the heating window; a second heater power head is installed corresponding to the second heating window heater to supply power to the second heating window heater; a luminous halogen lamp and a luminous halogen lamp power head are installed at the lower part of the light source head chamber; at the same time, a smoke density calibration plate is also installed above the luminous halogen lamp, which is used for inserting the card when calibrating the smoke density.

4. According to claim 1, a pneumatic precision-controlled centrifugal turntable diesel engine exhaust smoke detection device, Features: Two circles of concentric circle slots are also provided on the inner side of the upper disk surface of the detection turntable, and an airbag slot is provided between the two circles of concentric circle slots; elastic vibration damping plates are correspondingly distributed on the concentric circle slots; the elastic vibration damping plate is circular when viewed from above, and two concentric circle convex blocks are correspondingly provided on its upper plate surface; spring hooks are correspondingly provided on the concentric circle convex blocks; the elastic vibration damping plate is suspended on the upper disk surface of the detection turntable by springs; a pressure-regulating airbag is also distributed in the airbag slot, and the pressure-regulating airbag is provided with a valve nozzle.

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