KR200310228Y1 - Heated, light-extinction type diesel smoke meter - Google Patents

Abstract

LIGHT-EXTINCTION TYPE DIESEL SMOKE METER or DIESEL OPACITY METER is a device that measures the OPACITY of gas in real time by transmitting light through the gas containing soot. SAMPLING PROBE, SAMPLING LINE, MEASURING CHAMBER with heater and thermocouple installed, OPTICAL UNIT composed of LIGHT TRANSMITTER and LIGHT RECEIVER PROTECTION AIR or AIR CURTAIN A fan for supplying a fan and a flow path, a microcontroller, a measurement value indicating unit, and a printing device. Conventional diesel light transmission smoke detectors that measure the concentration of soot emitted from diesel engines, when the test is carried out at an ambient temperature of minus 5 to 10 ℃, moisture in the exhaust gas inside the sampling line through which the diesel exhaust gas passes Causes condensation into water.

In the present invention, in order to compensate for the above disadvantages, a heater and a thermocouple are installed in the sampling line of the conventional diesel light transmission type soot gas meter so as to control and heat the feedback at a constant temperature. This prevented the generation of condensed water in the sampling line when tested under ambient conditions of minus 5-10 ° C.

Heated diesel light transmission smoke measuring instrument (HEATED, LIGHT-EXTINCTION TYPE DIESEL SMOKE METER) of the present invention,

A sampling probe (12) inserted at the end of the exhaust pipe for measuring the soot concentration in the exhaust gas discharged from the diesel engine and the diesel vehicle,

The present invention is capable of heating at a constant temperature to prevent the generation of condensate by additionally installing a heater 14 and a thermocouple 15 in the sampling line 13 of the conventional light transmission smoke measuring instrument coupled to the outlet of the sampling probe. Heated sampling line,

A measuring chamber 16 through which the exhaust gas and the light beams pass, which are connected to the outlet of the heated sampling line and are heated at a constant temperature by installing a heater and a thermocouple 17 so that condensation of moisture does not occur;

An optical unit comprising a light emitting unit 18 and a light receiving unit 19 for measuring soot concentration by an optical method;

A fan 20 and a flow path for supplying anti-pollution air;

Interface and control the light source and optical sensor of the optical unit, control the heater of the sampling line to a constant temperature, control the fan to supply anti-pollution air, and control the heater to cover the measurement room to a constant temperature, A microcontroller that converts the concentration of soot using the generated electrical value,

A measurement indicator that visually displays the measurement value for the user to easily check,

It consists of a print that can print out the test results.

Description

Heated Diesel Light Transmission Smoke Meter {HEATED, LIGHT-EXTINCTION TYPE DIESEL SMOKE METER}

Since the early 1990s, North America and Europe have developed light transmission smoke detectors as standard measuring equipment and applied them to various diesel smoke regulations in order to improve the reliability of filter smoke detectors and the occurrence of large measurement errors. The light transmission type smoke meter is used as a basic equipment to measure and regulate the concentration of smoke emitted from all vehicles equipped with diesel engines, and the smoke of gas emitted from the chimney of diesel and petroleum boilers and power plants. It is also used to measure concentrations.In Korea, diesel light transmission type smoke measuring equipment is standard equipment for the detailed inspection of the operation department of the Ministry of Environment, which has been conducted in Korea in May 2002, after the pilot operation period of about three years. Was first introduced. Currently, diesel light transmission smoke detectors produced around the world have been developed to be tested at more than 5 degrees of image, but the Ministry of Environment requires that the test be carried out at outside temperatures of minus 10 degrees. Detailed inspections of driving vehicles are presented in the Ministry of Environment's Air Quality Preservation Act, the Air Quality Preservation Act, and the National Institute of Environmental Research. Therefore, the overseas products show problems that cannot be used in the weather of minus 5 ~ 10 ℃, the present invention was proposed to overcome this difficulty. In Figure 1, the sampling probe (2), sampling line (3), measuring room (4) a heater and a thermocouple (5) on the outer wall of the measurement chamber, an optical unit (6, 7, 8, 9), a fan (10) for supplying anti-pollution air, and a flow path, a microcontroller, a measurement value indicating unit, and a print. A schematic configuration diagram of a conventional diesel light transmission smoke measuring instrument (hereinafter, referred to as a conventional measuring instrument) is shown. Exhaust gas introduced from the inlet of the sampling probe 2 inserted into the exhaust pipe end 1 of the diesel engine or the vehicle flows into the center of the measurement chamber 4 via the sampling line 3. The soot-containing exhaust gas flows out into the outside air through the outlets at both ends of the measurement chamber. At this time, the light beam irradiated from the light emitting unit 6 of the optical unit reaches the light receiving unit 9 after passing through the exhaust gas and is detected as an electrical signal proportional to the amount of light. Light rays passing through the exhaust gas are absorbed or scattered by the soot in the exhaust gas, and only the remaining amount reaches the light receiving portion 9. This amount decreases in proportion to the concentration of soot, so it has been adopted as a quantitative method for measuring soot concentration. The technical content of this is described in detail in the International Standard ISO 11614 (ISO 11614). One side of the convex lens 7, which produces parallel rays in the light emitting unit 6, and one side of the convex lens 8, which has a light condensing function in the light receiving unit 9, may be exposed to and contaminated. If the lens is contaminated, the amount of light irradiated and the amount of light reaching the light receiving unit are changed and measured differently from the actual soot concentration. Therefore, by using a fan 10 or other apparatus, air pollution prevention air is supplied to the lens 7 and 8 to prevent contamination. The structure is designed to be. Therefore, supply of anti-pollution air is essential and all conventional measuring instruments are equipped with a fan for supply of anti-pollution air. The measurement chamber 4 into which the exhaust gas flows is equipped with a heater and a thermocouple 5 to heat the measurement chamber outer wall to a constant temperature of 80 degrees Celsius or more in order to prevent condensation of moisture. The microcontroller provides a function to measure the concentration of smoke in real time through the flow control of anti-pollution air, the control of the external wall heater 5 of the measurement chamber 4, the control of the optical elements of the optics 6 and 9, and the interface. Since all conventional measuring instruments of FIG. 1 have been developed and marketed to be used only at a temperature of 5 degrees or more of an image, there is a disadvantage that they cannot be used at outside temperatures of minus 5 to 10 ° C. This is because, while the exhaust gas flows into the measurement chamber 4 along the sampling line 3, excessive condensation of moisture occurs in the sampling line 3 exposed to an outside air condition of minus 5 to 10 ° C. This is because the condensed water is pushed into the measurement chamber 4 to contaminate the lenses 7 and 8 of the light emitting portion 6 and the light receiving portion 9. If the lens (7,8) is contaminated by condensate, soot will be adsorbed on it and continuous and continuous measurement will be impossible. The present invention has been made to overcome such a phenomenon because it is possible to apply the light transmission smoke detector in the occasional inspection conducted by city, district, and county offices in the future. Detailed inspections of driving vehicles are presented in the Ministry of Environment's Air Quality Preservation Act, the Air Quality Preservation Act, and the National Institute of Environmental Research.

2, a heater 14 and a thermocouple 15 are additionally installed in the sampling line 13 of the conventional measuring device of FIG. 1, and configured to control and heat the exhaust gas sampled at a constant temperature. A schematic diagram of a heated diesel light transmission smoke measuring apparatus (hereinafter, abbreviated as 'heating measuring instrument') is shown. The present invention of FIG. 2 is developed to overcome the disadvantages of the conventional measuring instrument of FIG. 1. As a heated type measuring device, it provides a function of preventing condensate from occurring in the sampling line 13 even at a temperature of minus 5 to 10 ° C. In order to provide such a function, the heater 14 and the thermocouple 15 installed on the outer wall of the sampling line 13 can be controlled at a constant temperature. Through the study for the present invention, the sampling line 13 By controlling the heater 14 to an image of 80 degrees or more, it was confirmed that the problem of soot measurement did not occur even in an outside air condition of minus 5 to 10 ° C.

1 is a sampling probe, a sampling line, an optical unit, a measuring chamber, a contamination air supply fan, and a microcontroller. 2) is a schematic configuration diagram of a conventional diesel light transmission soot measuring instrument (LIGHT-EXTINCTION TYPE DIESEL SMOKE METER, hereinafter abbreviated as 'a conventional measuring instrument') consisting of a measurement value indicating unit, a print, and the like. 3 is a schematic configuration diagram of a heated diesel light transmission smoke measuring instrument (hereinafter, referred to as a 'heating measuring instrument') in which a heater and a thermocouple are additionally installed in a sampling line of FIG. Results of various test data measured in the LUG-DOWN test mode. FIG. 4 shows a conventional meter and a heating type meter simultaneously when a diesel rundown test is performed under an ambient temperature test condition of minus 5 ° C. Ratio of test data installed and measured simultaneously * 1: Explanation of symbols for the main parts of the drawings * 1: End of exhaust pipe 2: Sampling probe 3: Sampling line 4: Measuring chamber 5: Heater and thermocouple of measuring chamber 6: Light emitting portion 7: Light emitting portion lens 8: Light receiving portion lens 9: Light-receiving part 10 Fan for supplying anti-pollution air 11 End of exhaust pipe 12 Sampling probe 13 Sampling line 14 Heater of sampling line 15 Thermocouple of sampling line 16 Measuring chamber 17 Heating chamber and thermocouple 18 Light-emitting part 19 Light-receiving part 20: Fan for supplying pollution prevention air

The present invention, as shown in Figure 2, the sampling probe 12, a heating type sampling line provided with a heater 14 and a thermocouple 15 in the sampling line 13 of the conventional measuring device, and the heater and the thermocouple 17 are installed Control the measuring chamber 16, the anti-pollution air supply fan 20 and the flow path, the sampling line and the measurement chamber at a constant temperature, control the anti-pollution air supply fan, and control the smoke concentration in real time through the optical element control and interface of the optical unit. The control of the heating sampling lines 13, 14, 15 is performed by adding an interface circuit for the thermocouple 15 and a power control circuit for the heater 14 to the conventional microcontroller. I realized it. It is also possible to install a separate independent temperature controller without modifying the conventional microcontroller, to interface the thermocouple 15 to heat the heater 14, and to control the temperature. I can fully understand.

3 shows various measured values measured in a conventional diesel lug-down test mode applied in a domestic vehicle overhaul. The test was carried out using a commercial van. This test is a data measured using a heating type meter, it can be understood that the flue gas concentration changes qualitatively according to the speed of the engine and the vehicle. The engine was started just before 20 seconds of elapsed time, held idle for 30 seconds, and then accelerated. During the acceleration period of the vehicle up to 66 seconds, soot concentration increases as the transmission changes and the engine speed and load increase. At about 66 seconds, 70KM per hour was maintained for about 5 seconds before entering 1 mode. Mode 1 runs at the vehicle's rated power and maximum engine speed. Mode 2 runs at 90% engine speed by adding load to the vehicle. In mode 3, the vehicle is driven at 80% engine speed by adding load to the vehicle. From the test data, it can be seen that the exhaust gas discharged from the diesel vehicle is discharged in the acceleration section more than the constant speed operation section. FIG. 4 shows the result of the conventional diesel rundown test under the test conditions at an ambient temperature of minus 5 degrees. This is the smoke concentration change when the measuring probe and the measuring probe of the conventional measuring instrument are inserted into the outlet of the exhaust pipe at the same time. Conventional measuring instruments show that the lens starts to be contaminated at the end of the acceleration period and shows no reliable results at the end of the 3 mode. However, the heated measuring device of the present invention shows very good results. In this figure, by comparing the measured values between the conventional measuring device and the heating type measuring device, the effect of the heating type measuring device of the present invention can be sufficiently understood. As described above, the present invention is heated to the sampling line of the conventional measuring device. It is a useful design that overcomes the shortcomings of the conventional diesel light transmission smoke meter that could not be tested in the outside air at minus 5 ~ 10 ℃ by providing a 'heated diesel light transmission smoke meter' equipped with a flag and thermocouple. The owner of the knowledge of the in diesel light transmission smoke meter can understand that various modifications are possible in accordance with the spirit of the present invention, and understand that such modifications are not new beyond the effects identified through the spirit and precise testing of the present invention. will be. It will also be appreciated that the effect of the present invention is very large.

Claims (2)

A sampling probe 12 inserted into the end 11 of the exhaust pipe for measuring the soot concentration in the exhaust gas discharged from the diesel engine and the vehicle, In addition to the outer wall of the sampling line 13 coupled to the outlet of the sampling probe 12, the heating type sampling line is provided with a thermocouple 15 and wrapped with a heating wire heater 14 on the thermocouple 15; , A measurement chamber (16) heated to a constant temperature by using a thermocouple and a heater (17) coupled to the outlet of the heated sampling line; An optical unit comprising a light emitting unit 18 and a light receiving unit 19 for measuring soot concentration by an optical method; Fan and flow path for supplying anti-pollution air; Controlling the heating coil heater 14 of the sampling line 13 to a constant temperature, controlling the heater 17 installed on the outer wall of the measurement chamber 16 to a constant temperature, and controlling a fan 20 for supplying anti-pollution air, Heated diesel light-transmission fumes comprising a microcontroller which interfaces with and controls the light source and the optical sensor of the optical unit 18 and 19 and provides the function of converting the concentration of the soot using the measured electrical signal at the same time. Measuring instrument. delete