JP3530029B2 - Exhaust gas sampling device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas sampling device for analyzing components in exhaust gas from automobiles,
In particular, the present invention relates to an exhaust gas sampling device having a feature of sampling and transferring the diluted exhaust gas.

[0002]

2. Description of the Related Art The structure of a conventional exhaust gas sampling device will be described with reference to FIG. Reference numeral 2001 in the drawing denotes an outside air supply pipe, one end of the outside air supply pipe 201 is an expanded outside air intake port 202, a filter 203 is provided in the outside air intake port 202, and the outside air supply pipe 20
An exhaust gas supply pipe 204 is connected in the middle of 1, and a downstream side of the connection portion of the exhaust gas supply pipe 204 is a mixed gas flow pipe 205, and a blower 206 provided on the downstream side dilutes it with the outside air. Exhaust gas mixed gas distribution pipe 20
It is pulled out to the downstream side through 5.

A mixing device 207 is arranged in the middle of the mixed gas flow pipe 205 on the downstream side of the connection portion of the exhaust gas supply pipe 204, and a mixing device 207 is provided downstream of the mixing device 207 for engines having different displacements. A venturi device 208 is arranged to secure a constant flow rate of exhaust gas.

A sampling pipe 209 is branched from the mixed gas flow pipe 205 on the downstream side of the mixing device 207 and on the upstream side of the venturi device 208, and the sampling pipe 209 is branched into three pipes. The sampling bags 211 are connected to the pipes 209a through joints 210. In addition, 3 branch pipes
The book is to measure LA-4 mode for US regulation, that is, the first sampling bag collects exhaust gas from the start to 504 seconds, and the second sampling bag collects 505 seconds. Is to collect the exhaust gas up to the time point of 1374 seconds after that, and to collect the exhaust gas in the third sampling bag from the restart after stopping for 10 minutes to the time of 504 seconds. In the US06 mode, only one of the three is used. There are 10 ・ 15 mode and 11 mode for Japanese domestic regulation.

Further, an outside air supply pipe 220 for reference is led out from the upstream side of the connection portion of the outside air supply pipe 201 with the exhaust gas supply pipe 204, and this outside air supply pipe 220 is also branched into three, and each branch pipe 220a ... are connected to sampling bags 211 ... Through joints 210 ...

Further, the read-back pipe 230 connected to the analyzer and the branch pipes 209a and 220a are connected to the valve 230.
a ... is connected and cut off, and the discharge pipe 240 and each branch pipe 2
09a and 220a are connected / disconnected by valves 240a .... The valve 2 of each branch pipe 209a, 220a
Valves 212, 2 are provided at positions upstream of 30a, 240a.
22 is provided.

The analysis method by the conventional exhaust gas sampling apparatus having the above-mentioned structure will be described with respect to the sampling pipe 209. The valve 212 is opened and the valves 230a and 230a are opened.
The pump is driven with 40a closed, and the diluted exhaust gas is introduced into each sampling bag 211.

Next, the valves 212 and 240a are closed, the valve 230a is opened, the diluted exhaust gas is sent to the analyzer through the readback pipe 230, and carbon monoxide (CO ), Hydrocarbons (HC), nitrogen oxides (NOx), etc. are measured.

When the measurement is completed, the valve 2
12, 230a are closed, the valve 240a is opened, the reversible pump 241 of the exhaust pipe 240 is reversely rotated to send air into the sampling bag 211, and then the reversible pump 241 is normally rotated to remove exhaust gas in the sampling bag. The air containing it is discharged. By repeating this operation, the exhaust gas in the sampling bag is completely removed to prepare for the next measurement.

[0010]

In the above conventional exhaust gas sampling device, the sampling bag 2 is used.
Since 11 is connected to the piping 209a on the side of the sampling device for analysis, the piping must be lengthened when the analysis device is located away from the exhaust gas sampling device, which is troublesome. At the same time, dew condensation occurs on the way, and the components in the exhaust gas melt into the dew condensation, making it impossible to obtain accurate analysis results.

Even in the conventional device, the joint 210
Although it is possible to separate the sampling bag 211 from the above portion, it is troublesome to carry a large number of sampling bags, and there is a risk that the bag containing the reference air and the bag containing the diluted exhaust gas for measurement are confused with each other. is there.
Furthermore, even if it can be carried, accurate measurement cannot be performed because the exhaust gas in the sampling bag cools during the carrying and condensation occurs, and the components in the exhaust gas melt during the condensation.

[0012]

In order to solve the above-mentioned problems, the present invention is to dilute exhaust gas with outside air, store the diluted exhaust gas in a sampling bag once, and analyze the stored diluted exhaust gas with an analyzer. In the exhaust gas sampling device so arranged, the sampling bag is arranged in a storage box that is separable from the sampling device body, and in this storage box, there are piping on the sampling device body side and piping inside the box. It was equipped with a connector unit for attaching and detaching. With such a configuration, a large number of sampling bags can be transferred at the same time, and moreover, the piping connection to the analyzer can be easily performed.

A heater is preferably provided in the storage box. By providing the heater, it is possible to prevent dew condensation from occurring during transfer or during analysis standby. Also,
By providing not only a heater but also a temperature controller, the temperature inside the storage box can be maintained constant, and by installing a battery in the storage box, the inside of the storage box can be maintained at a predetermined temperature even during movement. You can

Further, the connector unit may have a structure in which a flexible pipe in a box is held so as to be drawn out. With such a structure, the handleability is improved.

Further, it is possible to form an outlet in the connector unit for ejecting the warm air in the box toward the outside. With such a structure, the atmosphere connecting the piping of the analyzer and the piping drawn out from the box can be performed in a warm atmosphere, and dew condensation does not occur at the time of pipe connection. In particular, by making the connector unit movable up and down, it is possible to maintain the connection atmosphere at a temperature at which dew condensation is unlikely to occur even if the connection position of the pipe differs depending on the model of the analyzer.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an overall configuration diagram of an exhaust gas sampling apparatus according to the present invention. In the exhaust gas sampling apparatus, one end of an outside air supply pipe 1 is an expanded outside air intake 2, and a filter 3 is provided in the outside air intake 2. An exhaust gas supply pipe 4 is connected in the middle of the outside air supply pipe 1, and a downstream side of the connection portion of the exhaust gas supply pipe 4 is a mixed gas flow pipe 5, and a blower provided on the downstream side. The exhaust gas diluted with the outside air at 6 is drawn to the downstream side through the mixed gas flow pipe 5.

A mixing device 7 is provided in the middle of the mixed gas flow pipe 5 on the downstream side of the connecting portion of the exhaust gas supply pipe 4.
And a venturi device 8 is arranged downstream of the mixing device 7 for ensuring a constant flow rate of exhaust gas for engines having different displacements.

Two stainless steel sampling pipes 1 from the mixed gas flow pipe 5 on the downstream side of the mixing device 7 and on the upstream side of the venturi device 8.
0 and 20 are further branched, and further, an external air supply pipe 30 made of stainless steel for reference is branched from the upstream side of the confluence position of the external air supply pipe 1 with the exhaust gas supply pipe 4. Of the two sampling pipes 10 and 20, the sampling pipe 10 is for a normal engine, and the other sampling pipe 20 is for an engine of a gasoline low-pollution vehicle or an engine of a natural gas vehicle.

Valves 11 and 1 are provided in the sampling pipe 10.
2, a filter 13, a supply pump 14, a flow meter 15, and a pressure switch 16 are provided, and the downstream side of the pressure switch 16 is further divided into three branch pipes 10a ... And each branch pipe 10a ... Has a valve 17 ... Pressure switch 18 ...
Is provided.

Further, valves 21 and 22, a filter 23, a supply pump 24, a flow meter 25, and a pressure switch 26 are also provided in the sampling pipe 20 for an engine of a low-pollution gasoline vehicle.
Is provided, and the downstream side of the pressure switch 26 is further 3
It is divided into book branch pipes 20a, and each branch pipe 20a is provided with a valve 27 and a pressure switch 28, respectively.

The reference outside air supply pipe 30 is also provided with valves 31, 32, a filter 33, a supply pump 34, a flow meter 35, and a pressure switch 36, and the downstream side of the pressure switch 36 is further divided into three branches. Each of the branch pipes 30a is provided with a valve 37 ... And a pressure switch 38.

Each branch pipe 10a ..., 20a ...,
.. and the exhaust pipe 40 are connected and disconnected through a valve 40a, and a pump 41 is provided in the exhaust pipe 40.

Further, the analysis pipe 50 from each branch pipe 10a of the sampling pipe 10 is selectively connected to the exhaust pipe 40 and the analyzer through a valve 51, and each branch pipe 20a of the sampling pipe 20 is connected. For analysis from 5
0 is selectively connected to the exhaust pipe 40 and the analyzer via valves 52 and 53, and the analysis pipe 50 from each branch pipe 30a of the outside air supply pipe 30 is exhausted via the valves 54 and 55. It is selectively connected to the pipe 40 and the analyzer. Here, the analysis device connected to the analysis pipe 50 includes a general gasoline engine analyzer.

On the other hand, a nitrogen gas purge pipe 60 is provided downstream of the valves 11 and 21 of the sampling pipes 10 and 20.
Are connected. The nitrogen gas purge pipe 60 is provided with valves 61 ... And a nitrogen gas cylinder 62.

Further, a heat exchanger 71 for keeping the temperature of the mixed gas constant is arranged downstream of the mixing device 7 in the mixed gas flow pipe 5, and the venturi device 8 is also provided.
A heat exchanger 72 for extending the life of the blower 6 by lowering the temperature of the mixed gas flowing to the blower 6 on the downstream side of the
Are installed. Further, an air supply pipe 73 is connected to the mixed gas flow pipe 5 between the heat exchanger 72 and the blower 6 to further reduce the temperature of the mixed gas, and when the venturi 8 reduces the flow rate, the blower 6 The outside air is introduced from the air supply pipe 73 by the reduced amount so that the air can be sucked with a constant force without applying a load.

Further, in this embodiment, heaters are arranged at various places to prevent dew condensation of the mixed gas. Specifically, in the outside air supply pipe 1, a heater 80 is provided upstream of the confluence portion with the exhaust gas supply pipe 4, and a coil heater 81 is provided around the confluence portion with the outside air supply pipe 1 and the exhaust gas supply pipe 4. ,
A coil heater 82 is provided around the mixed gas flow pipe 5 on the upstream side of the mixing device 7, an oven heater 83 is provided in the vicinity of the mixing device 7, and branched sampling pipes 10 and 2 are provided.
A coil heater 84 is arranged around the middle portion of 0, and an oven heater 85 is arranged near the outside air supply pipe 30.

On the other hand, each branch pipe 10a ..., 20a ..., 3
Sampling bag storage box 10 at the end of 0a ...
0 is set. Details of the sampling bag storage box 100 will be described with reference to FIGS.
2 is a front view showing the internal structure of the sampling bag storage box, FIG. 3 is a side view of the sampling bag storage box, FIG. 4 is a plan view of the sampling bag storage box, and FIG. 5 is a perspective view of the lifting body. FIG. 6 is an enlarged view of a main part of the connector unit of the sampling bag storage box.

The storage box 100 has casters 1 on the bottom.
01 is attached and movable, and storage box 1
A heater 102 is arranged at the bottom of the storage box 100, and a fan 102a is provided near the heater 102 to circulate warm air in the storage box 100.
The inside of 0 is set to a uniform temperature atmosphere to prevent condensation of the exhaust gas for analysis.

Further, a temperature controller 120 is arranged in the storage box 100 so that the temperature in the storage box 100 becomes, for example, about 40 ° C. When the temperature is out of this set temperature, the heater 102 is turned on / off. I am trying to do it. In the state where the storage box 100 is attached to the sampling device main body, an AC 100V AC power source is used by using the outlet 121, while the storage box 100 is separated from the sampling device main body and moved, or while waiting in the analysis room. Is a storage box 100
A battery provided inside is used as a power source for the heater 102.

A partition plate 10 is provided inside the storage box 100.
3 is divided into left and right spaces, and a total of nine sampling bags 104 ... Can be stored in the wide space on the right side in FIG. The sampling bag 104 is made of a fluororesin having a low hydrocarbon (HC) generation level.

A bar 104a is provided on the upper end of the sampling bag 104, and the bar 104a is engaged with a rail 105 provided on the ceiling of the storage box 100 so that it can be moved in the horizontal direction. .

On the other hand, a connector unit 110 is provided on one side of the storage box 100. Connector unit 1
Reference numeral 10 is a vertical guide rail 111 that engages an elevating body 112. The lifting body 112 includes a plate 112a biased upward by a gas spring 113 and a plate 112a.
Guide holder 1 provided at an intermediate portion in the height direction of 12a
12b is provided.

The upper limit of the elevation body 112 is regulated by the stopper 114. That is, the stopper 114 is the left and right arms 1.
14a and 114a, and these arms 114a and 11a
4a is urged in the expanding direction by a spring arranged in the center. Thus, the lifting body 11 is resisted against the gas spring 113.
When 2 is pushed down together with the stopper 114, the arms 114a and 114a engage with the recessed portion formed in the rail 111 by the elastic force of the spring, and at that position, the lifting block 11
2 can be fixed.

Even when the plate 112a is moved up and down, the opening 100a formed in the side surface of the storage box 100.
The size of the storage box 100 is set so that the warm air of the storage box 100 does not escape from the opening 100a to the outside.

The guide holders 112b exposed from the openings 100a hold the same number of guides 115 as the number of the sampling backs 104. Each guide 1
A flexible pipe 116 made of stainless steel is inserted through 15 so as to be drawn out. This flexible piping 116
A joint 117 is attached to the front end of the, and the base end is fixed to a joint provided on the partition plate 103, one end of a stainless fixed pipe 118 is connected to this joint, and the other end of the fixed pipe 118 is connected. And each sampling back 104 are connected by a Teflon pipe.

Further, openings 122 are formed in the peripheral portion of the guide holder 112b for ejecting the warm air in the storage box 100 to the outside, and a hood 123 projects laterally so as to surround the openings 122. , This hood 123
The end of the flexible pipe 116 is housed in a space surrounded by.

In the above, in order to analyze the exhaust gas from a normal engine, first, the valves 21, 22 and 27 are analyzed.
..., 40a ..., 50a ... are closed, and valves 11, 12, 1 are closed.
After confirming that 7, ..., 31, 32, 37, ... Are open, an exhaust pipe of an automobile or the like is connected to the exhaust gas supply pipe 4, the blower 6 is driven, and the supply pump 13
After mixing the exhaust gas and the outside air with the mixing device 7, a part of the mixed gas is passed through the sampling pipe 10, the branch pipe 10a, ...
To store.

In parallel with the above, the supply pump 33 provided in the reference outside air supply pipe 30 is driven, and a part of the introduced outside air is stored in each sampling bag 104 through the branch pipes 30a. To do.

Then, the valve 51 is operated to operate the branch pipe 1
, 40a ... are closed and the valves 50a ... are opened, and the mixed gas for analysis stored in the bag 104B is branched into the branch pipe 10a. By backflowing the sample, it is sent to the analyzer on the bench for analysis.

Similarly, in parallel with the above, the valve 37
, 40a ... are closed and the valve 50a is opened, and the reference outside air (air) stored in the bag 104 is caused to flow backward through the branch pipes 30a .. so that it is sent to the analyzer attached to the sampling device main body. Perform an analysis.

Then, by analyzing the outside air for reference,
Since it is possible to know the proportion of components (for example, nitrogen oxides) that were originally contained in the outside air, corrective calculation of this value is performed, and by subtracting it from the analysis result of the mixed gas, nitrogen oxides, etc. generated by combustion You can know exactly how much.

When analyzing the components in the exhaust gas from an engine using natural gas or the like, the valve 11 of the sampling pipe 10 is closed and the valve 21 of the sampling pipe 20 is opened, and the same procedure as described above is performed. Are collected by using a dedicated analyzer for natural gas or the like, which is separately provided.

In this case, the joint 117 is removed from each of the branch pipes 10a ..., 20a ..., 30a ..., the storage box 100 is moved to the analysis room, and the joint 117 is connected to each pipe of the analyzer for analysis. .

A joint 117 is attached to each pipe of the analyzer.
When connecting the flexible pipe 116 to the guide 11
If it is pulled out from 5, connection work can be performed easily.
In addition, the heater 102 warms the sampling bag 104 during transfer and standby to prevent dew condensation.

At the time of connection work, the inside of the storage box 100 is heated to a relatively high temperature (about 40 ° C.) by the heater 102.
Therefore, the hot air in the storage box 100 is jetted toward each pipe of the analyzer from the opening 122 provided at the peripheral edge of the guide holder 112b, and the connection work is performed in a state where the atmosphere is at a high temperature to some extent. . This prevents condensation. When the height of the piping of the analyzer changes depending on the model, the ascending guide holder 112b is subjected to the above-mentioned method.
The height of the opening 122 is adjusted to match the height of the opening 122 with the height of the pipe, so that the connection work atmosphere can be a warm atmosphere.

[0046]

As described above, in the exhaust gas sampling apparatus according to the present invention, the sampling bag is housed in the box and the box can be separated from the sampling apparatus. A large number of bags can be easily transferred to the analysis room at, and since the box itself is equipped with a connector unit, the piping inside the box can be directly connected to the analyzer without taking the bag out of the box for measurement.

Further, since the box is provided with the heater, it is possible to prevent the exhaust gas in the bag from being condensed, so that accurate measurement can be performed.

Further, a part of the pipe provided in the box is a flexible pipe, and this flexible pipe can be pulled out from the connector unit, so that connection and disconnection with the pipe of the sampling device main body or the pipe of the analysis device side can be performed. Will be easier.

Furthermore, if hot air is blown from the connector unit, it is possible to prevent dew condensation when connecting to the piping on the analyzer side. If an opening for blowing air is provided, it can correspond to the height position of the pipe on the analyzer side.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an exhaust gas sampling device according to the present invention.

FIG. 2 is a front view showing the internal structure of a sampling bag storage box.

FIG. 3 is a side view of the sampling bag storage box.

FIG. 4 is a plan view of the sampling bag storage box.

FIG. 5 is a perspective view of a lifting body.

FIG. 6 is an enlarged view of a main part of a connector unit of a sampling bag storage box.

FIG. 7 is an overall configuration diagram of a conventional exhaust gas sampling device.

[Explanation of symbols]

1 ... Outside air supply pipe, 2 ... Outside air intake port, 3 ... Filter,
4 ... Exhaust gas supply pipe, 5 ... Mixed gas distribution pipe, 6 ... Blower, 7 ... Mixing device, 8 ... Venturi device, 1
0, 20 ... Sampling pipe, 30 ... External air supply pipe for reference, 40 ... Exhaust pipe, 50 ... Analysis pipe, 10a,
20a, 30a ... Branch piping, 11, 12, 17, 21,
22, 31, 32, 40a, 50a ... Valves, 13, 2
3, 33 ... Supply pump, 15, 25, 35 ... Flowmeter, 1
6, 26, 36 ... Pressure switch, 60 ... Nitrogen gas purge pipe, 71, 72 ... Heat exchanger, 73 ... Air supply pipe,
80, 81, 82, 83, 84, 85, 102 ... Heater, 100 ... Storage box, 101 ... Casters, 10
4 ... Sampling back, 110 ... Connector unit,
111 ... Guide rail, 112 ... Elevating body, 112a ... Plate, 112b ... Guide holder, 113 ... Cylinder unit, 114 ... Stopper, 114a ... Stopper arm, 115 ... Guide, 116 ... Flexible piping, 11
7 ... Joint, 118 ... Fixed piping, 120 Temperature controller, 121 ... Outlet, 122 ... Hot air blowing opening.

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kyosuke Sasaki 1907 Hirata-cho, Suzuka-shi, Mie Honda Motor Co., Ltd. Suzuka Factory (72) Keisuke Ohara 1907, Hirata-cho, Suzuka-shi, Mie Honda Motor Co., Ltd. Inside the Suzuka Plant (72) Inventor Shigeru Yanagihara 1-19-4 Tamazumi, Setagaya-ku, Tokyo Stock company JIKEN (72) Inventor Shuta Yamawaki 1-19-4 Tamazumi, Setagaya-ku Tokyo Inside Sokken (56) Reference JP 10-111222 (JP, A) JP 6-207890 (JP, A) JP 7-35660 (JP, A) JP 7-72050 (JP, A) Japanese Unexamined Patent Publication No. 8-226879 (JP, A) Ukaikai Hei 6-84349 (JP, U) US Patent 2223785 (US, A) US Patent 3793887 (US, A) (58) Fields investigated (Int.Cl) . ⁷ , DB name) G01N 1/0 0-1/44

Claims (2)

(57) [Claims] 1. An exhaust gas sampling device in which an exhaust gas is diluted with outside air, the diluted exhaust gas is once stored in a sampling bag, and the stored diluted exhaust gas is analyzed by an analyzer. It is placed in a box that is separable from the sampling device body, and this box is equipped with a connector unit that connects and disconnects the piping on the sampling device body side and the piping inside the box.
Exhaust gas sampling device according to claim Rukoto air outlet of the hot air are formed in the box. 2. The exhaust gas is diluted with outside air,
Once the exhaust gas that has been released is stored in the sampling bag,
Exhaust gas so that the diluted exhaust gas that has been delivered is analyzed by an analyzer
In the gas / gas sampling device, the sampling
The bag was separable from the sampling device body
Placed inside a box, this box
The connector that connects and disconnects the piping on the main unit side with the piping inside the box.
The connector unit is provided with an elevating block, the elevating block holds the flexible piping in the storage box so that it can be pulled out, and the outlet for hot air in the storage box is formed. A characteristic exhaust gas sampling device.