JPH0514884U - Exhaust gas measuring device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent each moving part from becoming inoperable due to the vibration associated with the exhaust pulsation that occurs in the exhaust pipe during the test. [Structure] An upright exhaust pipe connected to the outlet side of the muffler is supported by vertically arranged columns.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an exhaust gas measuring device, and in particular, extracts a part of engine exhaust gas from the inside of an exhaust pipe and guides it to a mini dilution tunnel, where the exhaust gas is diluted with the atmosphere. The present invention relates to an exhaust gas measuring device that measures harmful substances such as nitrogen oxides.

[0002]

[Prior Art]

 Mini-dilution tunnels are used to measure the exhaust emissions of engines, especially diesel engines. An exhaust gas measuring device that uses a mini-dilution tunnel samples and extracts part of the exhaust gas using a sampling tube, and dilutes the extracted part of the exhaust gas with the atmosphere in the mini-dilution tunnel. The measurement of nitrogen oxides, etc. is performed by exposing the same state as when exhaust gas is released into the atmosphere.

According to such a mini-dilution tunnel method, since it is not necessary to dilute the total amount of exhaust gas, the dilution tunnel becomes smaller, which also increases the size of the exhaust gas measuring device. It becomes possible to make it compact.

FIG. 3 shows a main part of a conventional exhaust gas diluting device of such a mini-dilution tunnel type. An exhaust pipe 2 is connected to the outlet side of a muffler 1 so as to stand upright. ing. Then, a part of the exhaust gas flowing in the exhaust pipe 2 is extracted by the extraction pipe 3 and dilution is performed in the mini dilution tunnel 4.

The upright exhaust pipe 2 is hung and supported by a rod 6 via an orifice switching device 5. The upper end of the exhaust pipe 2 is connected to the flue 7 in a state of being open to the atmosphere. The flue 7 is also suspended and supported by the rod 6 via the atmosphere opening device 8.

[0006]

[Problems to be solved by the device]

 Thus, the upright exhaust pipe 2 and the flue 7 of the conventional mini-dilution tunnel type exhaust gas measuring device are both hung and supported by the rod 6. The length of the rod 6 is adjusted by the turnbuckle 9 shown in FIG. 4, and the horizontality of the orifice switching device 5 and the atmosphere opening device 8 is adjusted by the turnbuckle 9. According to such a support method, vibration is generated by exhaust pulsation generated in the exhaust pipe 2 during the test, and this vibration is transmitted to the rod 6 and the turnbuckle 9 that adjusts the length of the rod 6 resonates. As a result, there is a problem that the movable parts shown in FIG. 3 do not operate.

The present invention has been made in view of the above problems, and exhaust gas measurement for preventing each movable part from not operating due to vibration due to exhaust pulsation generated in an exhaust pipe during a test. The purpose is to provide a device.

[0008]

[Means for Solving the Problems]

 The present invention allows the exhaust gas of an engine to flow through a muffler in an upright exhaust pipe from the lower side to the upper side, extract a part of the exhaust gas in the exhaust pipe and guide it to a mini-dilution tunnel. An exhaust gas measuring device in which the exhaust gas is diluted with atmospheric air in a tunnel, in which an upright exhaust pipe connected to the outlet side of the muffler is supported by vertically arranged columns. It

[0009]

[Action]

 Therefore, the upright exhaust pipe connected to the outlet side of the muffler will be supported by the vertically arranged columns. Then, a part of the exhaust gas flowing in this exhaust pipe is extracted and guided to the mini-dilution tunnel. In the mini-dilution tunnel, the exhaust gas is diluted with the atmosphere, and harmful substances of nitrogen oxides are discharged. Measurements will be taken.

[0010]

【Example】

 FIG. 2 shows the entire structure of an exhaust gas measuring device according to an embodiment of the present invention, in which an exhaust pipe 12 is connected to an exhaust manifold 11 provided on a side surface of a diesel engine 10. There is. A muffler 14 is connected to the exhaust pipe 12.

The muffler 14 is arranged so as to stand upright, and the exhaust gas is made to flow upward from below. An exhaust pipe 15 is connected to the outlet side of the muffler 14, and a resonator 16 is connected to the exhaust pipe 15 so as to branch. The upper end of the exhaust pipe 15 is open to the atmosphere and faces the inlet of the flue 17. The flue 17 is drawn to the roof through an upper opening 19 formed in the ceiling of the laboratory 18, and is connected to an exhaust blower 20.

Further, this exhaust gas measuring device is provided with a mini-dilution tunnel 24, and an inlet side portion thereof is connected to an air introduction pipe 25. An air pressure adjusting valve 26 is connected to the air introducing pipe 25. A heat exchanger 27 and a blower 28 are connected downstream of the mini-dilution tunnel 24.

A sampling pipe 30 is inserted below the bypass orifice 29 of the exhaust pipe 15 connected to the outlet of the muffler 14, and the exhaust gas extracted by the sampling pipe 30 is mini-diluent. It is designed to be installed in the optional tunnel 24. A sampling orifice 31 is attached to the sampling tube 30.

Further, part of the exhaust gas diluted in the mini-dilution tunnel 24 is sampled by the sampling pump 32 and guided to the NOx meter 33.

The exhaust gas diluted in the mini dilution tunnel 24 is adapted to be sucked by the sampling pump 35 through the particulate filter 34, and the amount of the exhaust gas at this time is detected by the flow meter 36. It has become so.

On the outlet side of the muffler 14, the exhaust gas sampled from the exhaust pipe 15 is directly guided to the pretreatment device 37 so that the pretreated exhaust gas is guided to the NOx meter 38. It has become.

Next, the structure for supporting the upright exhaust pipe 15 connected to the muffler 14 and the flue 17 connected to the upper end of the exhaust pipe 15 will be described. As shown in FIG. The pipe 41 is used as a support means. The exhaust pipe 15 is supported by the support column 41 by the connecting bracket 42. Further, the support column 41 supports the orifice switching unit 43. The orifice changer 43 holds disc-shaped orifices 29 having different diameters so as to be exchangeable at an intermediate position of the exhaust pipe 15.

A portion of the flue 17 which receives the exhaust pipe 15 is supported by the support column 41 via a connecting bracket 46. An air release device 44 is attached to the tip of the flue 17, and the opening amount of the opening 45 is adjusted by a motor 47 and gears 48 and 49.

In the configuration as described above, the exhaust gas generated by the operation of the engine 10 shown in FIG. 2 is taken out through the exhaust manifold 11 and the exhaust pipe 12. At this time, the exhaust pulsation is reduced by the muffler 14. Then, part of the exhaust gas passing through the exhaust pipe 15 is extracted by the sampling pipe 30 and guided to the mini-dilution tunnel 24.

In the mini dilution tunnel 24, the exhaust gas is diluted by the atmosphere introduced through the air introduction pipe 25. Then, the diluted exhaust gas is sampled by the sampling pump 32 and the NOx meter 33 measures the amount of nitrogen oxides. The diluted exhaust gas is sucked by the sampling pump 35 and passes through the particulate filter 34, and the amount of particulates captured by the filter 34 at this time is measured.

The state of the exhaust gas before being diluted is measured by the NO x meter 38 after the exhaust gas directly taken out from the exhaust pipe 15 at the outlet side of the muffler 14 is pretreated by the pretreatment device 37. I am trying.

In the measuring apparatus for measuring the exhaust gas in this manner, the exhaust pipe 15 standing upright and the flue 17 connected to the upper end thereof are supported by the column 41 having a hollow circular pipe structure shown in FIG. It is supposed to be done. With such a support structure, even if vibration occurs due to pulsation of exhaust gas passing through the exhaust pipe 15, deformation of each part can be prevented. Moreover, the orifice switching device 43 and the atmosphere opening device 44 can be reliably leveled, and the aesthetic appearance is not complicated and the device is clean.

That is, it is possible to surely solve the problem that the movable parts do not operate due to loosening due to vibration as in the conventional art.

[0024]

[Effect of the device]

 As described above, according to the present invention, the upright exhaust pipe connected to the outlet side of the muffler is supported by the vertically arranged support columns. Therefore, with such a structure, the loosening due to the exhaust pulsation in the exhaust pipe does not occur during the test, and thereby it is possible to reliably prevent the situation where the movable parts do not operate due to vibration.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part of an exhaust gas measuring device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the overall structure of an exhaust gas measuring device.

FIG. 3 is a perspective view of a main part of a conventional exhaust gas measuring device.

FIG. 4 is a front view showing a turnbuckle for leveling the device.

[Explanation of symbols]

 10 Engine 12 Exhaust Pipe 14 Muffler 15 Exhaust Pipe 24 Mini Dilution Tunnel 30 Sampling Pipe 33 NOx Meter 34 Particulate Filter

Claims (1)

[Scope of utility model registration request] 1. An engine exhaust gas is caused to flow through a muffler in an upright exhaust pipe from the lower side to the upper side, and a part of the exhaust gas in the exhaust pipe is extracted and guided to a mini-dilution tunnel. In an exhaust gas measuring device in which the exhaust gas is diluted with the atmosphere in a solution tunnel, an upright exhaust pipe connected to the outlet side of the muffler is supported by a vertically arranged strut. Characteristic exhaust gas measurement device.