A high-precision detector for diesel engine exhaust smoke

Abstract

The invention discloses a high-precision detector for diesel engine exhaust smoke, comprising a detector body, the detector body being a nearly hemispherical structure; the detector body comprising an outer cover hemisphere and an inner cover hemisphere, the inner cover hemisphere being distributed inside the outer cover hemisphere, and a gap being left between the outer cover hemisphere and the inner cover hemisphere to form a hemispherical exhaust slot; a smoke exhaust pipe is provided on the top of the outer cover hemisphere, and an exhaust fan is provided in the smoke exhaust pipe. The invention can realize high-precision and stable detection.

Description

Technical Field

[0001] The invention relates to the technical field of high-precision detection of diesel engine exhaust smoke, and in particular to a high-precision detector for diesel engine exhaust smoke. 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 high-precision detector for diesel engine exhaust smoke which can detect accurately and stably.

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

[0006] A high-precision detector for diesel engine exhaust smoke, comprising a detector body, the detector body being of a nearly hemispherical structure; the detector body comprising an outer cover hemisphere and an inner cover hemisphere, the inner cover hemisphere being distributed inside the outer cover hemisphere, and a gap being left between the outer cover hemisphere and the inner cover hemisphere to form a hemispherical exhaust slot; a smoke exhaust pipe is provided on the top of the outer cover hemisphere, and an exhaust fan is provided in the smoke exhaust pipe; a detection disc upper cover is combined with a detection disc lower cover at the lower part of the inner cover hemisphere, and a detection disc lower cover is combined with a detection disc lower cover at the lower part of the outer cover hemisphere; the detection disc upper cover and the detection disc lower cover are distributed correspondingly to each other to form a hollow detection disc; a smoke inlet pipe is connected to the middle part of the detection disc lower cover; a detection hole is correspondingly provided on the detection disc upper cover, and a detection chamber is provided corresponding to the detection hole; a light transmission hole is also correspondingly provided on the detection disc lower cover, and a light source head chamber is also provided at the light transmission hole; a smoke disc air outlet is provided on the outer edge of the detection disc.

[0007] Furthermore, a heating plate is provided on each of the upper cover of the detection disc and the lower cover of the detection disc.

[0008] Furthermore, a temperature sensing element is provided in the hemispherical exhaust groove.

[0009] Furthermore, an oblique nozzle is provided at the smoke disc outlet.

[0010] Furthermore, the exhaust fan adopts a servo motor to drive the fan blades.

[0011] Furthermore, the detection chamber is arranged at a radius of 1 / 3 from the center of the upper cover of the detection disc.

[0012] 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.

[0013] 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.

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

[0015] (1) The present invention provides a hollow detection disc and designs the air inlet pipe to be distributed in the center, so that the smoke to be detected flows evenly from the center to the surroundings; then a circle (more than 4) of detection chambers are provided at a radius of 1 / 3 of the center point of the detection disc, which can significantly reduce the error of smoke flow.

[0016] (2) By setting the detector body into a nearly hemispherical structure, 360-degree uniform exhaust can be achieved to improve the uniformity and stability of smoke flow and ensure the stability of the detection value.

[0017] (3) The use of a hollow detection disc for smoke detection can significantly increase the smoke flow space, reduce the impact of pulse smoke on the inner wall, and reduce the local smoke concentration. At the same time, the combination of heating windows in the detection room and the light source head room can significantly reduce the adhesion and precipitation of black smoke and improve the detection accuracy.

[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. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of the outer cover hemisphere and the inner cover hemisphere after being cut open;

[0021] Figure 2 is a partial cutaway view of the present invention;

[0022] Figure 3 It is a structural schematic diagram of the light source head chamber of the present invention;

[0023] Figure 4 It is a structural schematic diagram of the detector chamber of the present invention. DETAILED DESCRIPTION

[0024] like Figures 1 to 4 As shown, a high-precision detector for diesel engine exhaust smoke density includes a detector body, which is a nearly hemispherical structure; the detector body includes an outer cover hemisphere 1 and an inner cover hemisphere 2, the inner cover hemisphere 2 is distributed inside the outer cover hemisphere 1, and a gap is left between the outer cover hemisphere and the inner cover hemisphere to form a hemispherical exhaust slot 4; a smoke exhaust pipe 5 is opened on the top of the outer cover hemisphere, and an exhaust fan 6 is arranged in the smoke exhaust pipe; the exhaust fan adopts a servo motor to drive the fan blades, which is mainly controllable and adjustable for different smoke concentrations required by different models, and once a certain model obtains the best detection concentration after testing (it is necessary to comprehensively consider parameters such as airflow stability and smoke concentration sedimentation), the speed of this servo motor will remain unchanged accordingly.

[0025] The lower part of the inner cover hemisphere 2 is combined with a detection disc upper cover, and the lower part of the outer cover hemisphere 1 is combined with a detection disc lower cover; the detection disc upper cover and the detection disc lower cover are distributed correspondingly to each other to form a hollow detection disc 7, that is, a circular cavity 7-3 is formed; an oblique nozzle 7-1 is provided at the flue gas disc outlet 7-2, and the flue gas disc outlet 7-2 is distributed along the outer edge of the detection disc. The use of this configuration can improve the flow stability and uniformity of the flue gas in the disc, which is conducive to improving the detection accuracy. The middle part of the detection disc lower cover is connected to a flue gas inlet pipe 10; the detection disc upper cover is correspondingly provided with a detection hole 7-4, and a detection chamber 9 is provided at the detection hole; the detection disc lower cover is also correspondingly provided with a light-transmitting hole 7-5, and a light source head chamber 11 is also provided at the light-transmitting hole; the detection disc upper cover and the detection disc lower cover are each provided with a heating plate 8. The hemispherical exhaust slot 4 is also provided with a temperature sensing element for monitoring the smoke temperature and controlling the switch of the heating plate 8 through a control circuit to maintain the stability of the smoke temperature. The detection chamber 9 of this embodiment is located at a radius of 1 / 3 from the center of the upper cover of the detection disc. Four are evenly arranged along a circle at this distance. Of course, the four light source head chambers 11 distributed on the lower cover of the detection disc are also distributed corresponding to the detection chamber 9. 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 provided on the upper side of the heating window. The first heating window heater is correspondingly provided with a first heater power supply head 9-5 to supply power to the first heating window heater; the upper part of the detection chamber 9 is also sequentially distributed with 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. 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 provided 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 at the lower part of the light source head chamber; at the same time, a smoke density calibration plate 11-4 is installed above the halogen light-emitting lamp, which is used for inserting the card when calibrating the smoke density.

Claims

1. A diesel engine exhaust smoke detector, characterized in that: The invention comprises a detector body, which is in a nearly hemispherical structure; the detector body comprises an outer cover hemisphere and an inner cover hemisphere, the inner cover hemisphere is distributed inside the outer cover hemisphere, and a gap is left between the outer cover hemisphere and the inner cover hemisphere to form a hemispherical exhaust slot; a smoke exhaust pipe is provided on the top of the outer cover hemisphere, and an exhaust fan is provided in the smoke exhaust pipe; a detection disc upper cover is combined with a detection disc lower cover at the lower part of the inner cover hemisphere, and a detection disc upper cover and a detection disc lower cover are combined with each other. The cloth forms a hollow detection disc; the middle part of the lower cover of the detection disc is connected with a smoke inlet pipe; the upper cover of the detection disc is correspondingly provided with a detection hole, and a detection chamber is provided at the corresponding detection hole; the lower cover of the detection disc is also correspondingly provided with a light-transmitting hole, and a light source head chamber is also provided at the light-transmitting hole; a smoke disc outlet is provided at the outer edge of the detection disc; a heating plate is respectively provided on the upper cover and the lower cover of the detection disc; a temperature sensing element is also provided in the hemispherical exhaust groove; the detection chamber is arranged at a radius of 1 / 3 from the center of the upper cover of the detection disc.

2. A diesel engine exhaust smoke detector according to claim 1, characterized in that: An oblique nozzle is arranged at the gas outlet of the flue gas disc.

3. A diesel engine exhaust smoke detector according to claim 1, characterized in that: The exhaust fan adopts a servo motor to drive the fan blades.

4. A diesel engine exhaust smoke detector according to claim 1, characterized in that: 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.

5. A diesel engine exhaust smoke detector according to claim 1, characterized in that: A heating window is 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 supply 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 supply 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.

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