JP2000035387A - Exhaust gas sampling apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transfer a bag housing exhaust gas to an analyzer provided at a place separated from an exhaust gas sampling apparatus without generating dew condensation. SOLUTION: A housing box 100 has castors 101 attached to the bottom surface thereof and heaters 102 are arranged to the bottom part of the housing box 100. This housing box 100 is divided into left and right spaces by a partition plate 103 and nine sampling bags 104... can be housed in the right wide space in total and a connector unit 110 is provided to one side of the housing box 100. In this connector unit 110, a lift member 112 (112a, 112b) is engaged with a vertical guide rail 111 and upwardly urged by a gas spring. Guides 115... are provided to the guide holder 112b of the lift member 112 in the same number as the sampling bags 104 and a flexible piping 116 made of stainless steel is inserted into each guide 115 so as to be made possible to draw out.

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 apparatus for analyzing components in exhaust gas of an automobile or the like.
In particular, the present invention relates to an exhaust gas sampling device characterized by a configuration for sampling and transferring containing diluted exhaust gas.

[0002]

2. Description of the Related Art The structure of a conventional exhaust gas sampling apparatus will be described with reference to FIG. In the figure, reference numeral 2001 denotes an outside air supply pipe. One end of the outside air supply pipe 201 is an expanded outside air intake 202, and a filter 203 is provided in the outside air intake 202.
An exhaust gas supply pipe 204 is connected in the middle of 1, and a downstream side of a connection portion of the exhaust gas supply pipe 204 is a mixed gas distribution pipe 205, and the mixture is diluted with outside air by a blower 206 provided on the downstream side. Exhaust gas is mixed gas distribution pipe 20
5 to the downstream side.

[0003] A mixing device 207 is arranged in the middle of the mixed gas distribution pipe 205 downstream of the connection portion of the exhaust gas supply pipe 204, and a mixing device 207 is always provided downstream of the mixing device 207 for engines having different displacements. A venturi device 208 for securing a constant flow rate of exhaust gas is provided.

Further, a sampling pipe 209 is branched from a mixed gas distribution pipe 205 downstream of the mixing apparatus 207 and upstream of the venturi apparatus 208, and the sampling pipe 209 is branched into three pipes. The sampling bags 211 are connected to the pipes 209a via the joints 210. In addition, 3 branch pipes
The book is based on the measurement in the LA-4 mode for the US regulation, that is, the first sampling bag collects the exhaust gas from the start until 504 seconds have elapsed, and the second sampling bag has 505 seconds. This is because the exhaust gas is collected up to 1374 seconds after the start, and collected in the third sampling bag from the restart after the stop for 10 minutes until 504 seconds. In the US06 mode, only one of the three is used. In addition, there are 10.15 mode and 11 mode for regulation in Japan.

[0005] A reference outside air supply pipe 220 is derived from the upstream side of the connection between the outside air supply pipe 201 and the exhaust gas supply pipe 204, and this outside air supply pipe 220 is also branched into three pipes. 220a are connected to sampling bags 211 via joints 210.

Further, the readback pipe 230 connected to the analyzer and each of the branch pipes 209a and 220a are connected to a valve 230.
a, communication and cutoff, the discharge pipe 240 and each branch pipe 2
09a and 220a are communicated and blocked by valves 240a. In addition, the valve 2 of each branch pipe 209a, 220a
Valves 212 and 2 are located upstream of 30a and 240a.
22 are provided.

The analysis method using the conventional exhaust gas sampling apparatus having the above-described configuration will be described with respect to the sampling pipe 209. When the valve 212 is opened, 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, and the diluted exhaust gas is sent to the analyzer via the readback pipe 230. According to a predetermined measurement mode, carbon monoxide (CO) in the exhaust gas is discharged. ), Hydrocarbons (HC), nitrogen oxides (NOx), etc. are measured.

When the measurement is completed, the valve 2
12, 230a is closed, the valve 240a is opened, the reversible pump 241 of the exhaust pipe 240 is reversed, air is sent to the sampling bag 211, and then the reversible pump 241 is rotated forward to remove the exhaust gas in the sampling bag. Exhaust air including. By repeating this operation, the exhaust gas in the sampling bag is completely eliminated to prepare for the next measurement.

[0010]

In the conventional exhaust gas sampling apparatus described above, the sampling bag 2
11 is connected to the pipe 209a of the main body of the sampling apparatus, so that the analysis is performed. Therefore, when the analysis apparatus is located at a position distant from the exhaust gas sampling apparatus, the pipe must be lengthened, which is troublesome. In addition, dew condensation occurs on the way, and components in the exhaust gas melt into the dew condensation, so that accurate analysis results cannot be obtained.

[0011] Even in the conventional device, the joint 210
Although it is possible to separate the sampling bag 211 from the part, it is troublesome to carry a large number of sampling bags, and there is a possibility that a bag containing air for reference and a bag containing diluted exhaust gas for measurement may be mistaken. is there.
Furthermore, even if it can be carried around, the exhaust gas in the sampling bag cools down during carrying, dew condensation occurs, and the components in the exhaust gas melt during the dew condensation, so that accurate measurement cannot be performed.

[0012]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention dilutes exhaust gas with outside air, temporarily stores the diluted exhaust gas in a sampling bag, and analyzes the stored diluted exhaust gas with an analyzer. In the exhaust gas sampling device, the sampling bag is arranged in a storage box capable of being separated from the sampling device main body, and the storage box has piping on the sampling device main body side and piping in the box. It has 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 the piping connection to the analyzer can be easily performed.

It is preferable that a heater is provided in the storage box. By providing the heater, it is possible to prevent the occurrence of dew condensation 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 at a constant level. Further, by mounting a battery in the storage box, the inside of the storage box can be maintained at a predetermined temperature even while moving. Can be.

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

[0015] Further, it is possible to form a blowout port for blowing out the warm air in the box outwardly in the connector unit. With such a configuration, the atmosphere for connecting the piping of the analyzer and the piping drawn from the box can be performed in a warm atmosphere, and dew condensation does not occur when the piping is connected. In particular, by allowing the connector unit to move up and down, it is possible to maintain the connection atmosphere at a temperature at which dew condensation does not easily occur even if the connection position of the piping differs for each model of the analyzer.

[0016]

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 device according to the present invention. In the exhaust gas sampling device, 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 a connection portion of the exhaust gas supply pipe 4 is a mixed gas flow pipe 5, and a blower provided on the downstream side is provided. At 6, the exhaust gas diluted by the outside air is drawn out to the downstream side through the mixed gas distribution pipe 5.

In the middle of the mixed gas flow pipe 5 downstream of the connection of the exhaust gas supply pipe 4, a mixing device 7 is provided.
And a venturi device 8 for ensuring a constant flow of exhaust gas for engines having different displacements is disposed downstream of the mixing device 7.

Further, two stainless sampling pipes 1 are provided from the mixed gas flow pipe 5 downstream of the mixing apparatus 7 and upstream of the venturi apparatus 8.
Reference numerals 0 and 20 are branched, and a reference stainless steel external air supply pipe 30 is further branched from an upstream side of a position where the outside air supply pipe 1 joins the exhaust gas supply pipe 4. Note that, of the two sampling pipes 10, 20, the sampling pipe 10 is for a normal engine, and the other sampling pipe 20 is for an engine of a low-pollution gasoline vehicle or an engine of a natural gas vehicle or the like.

The sampling pipe 10 has valves 11, 1
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. Pressure switch 18 ...
Is provided.

Also, valves 21 and 22, a filter 23, a supply pump 24, a flow meter 25, and a pressure switch 26 are provided in a sampling pipe 20 for an engine of a gasoline low-emission vehicle.
And the downstream side of the pressure switch 26 is further
Each branch pipe 20a is provided with a valve 27 and a pressure switch 28, respectively.

Also, valves 31 and 32, a filter 33, a supply pump 34, a flow meter 35, and a pressure switch 36 are provided in the outside air supply pipe 30 for reference, and the downstream side of the pressure switch 36 is further branched into three branches. The branch pipes 30a are provided with valves 37 and pressure switches 38, respectively.

Each of the branch pipes 10a,.
.. And the exhaust pipe 40 are communicated / blocked via a valve 40 a, and the exhaust pipe 40 is provided with a pump 41.

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

On the other hand, a nitrogen gas purge pipe 60 is located 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 maintaining the temperature of the mixed gas at a constant level is provided downstream of the mixing device 7 in the mixed gas distribution pipe 5.
Downstream of the heat exchanger 72 for lowering the temperature of the mixed gas flowing to the blower 6 and extending the life of the blower 6.
Is arranged. 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 to reduce the flow rate of the blower 6 when the flow rate is reduced by the venturi 8. The outside air is introduced from the air supply pipe 73 only by the squeezed amount so that the suction can be performed with a constant force without applying a load to the air supply pipe 73.

Further, in this embodiment, heaters are arranged at various places to prevent the dew condensation of the mixed gas. Specifically, a heater 80 is provided in the outside air supply pipe 1 on the upstream side of a junction with the exhaust gas supply pipe 4, and a coil heater 81 is provided around the junction of 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, and an oven heater 83 is provided near the mixing device 7.
A coil heater 84 is arranged around the intermediate portion of the cylinder 0, and an oven heater 85 is arranged near the outside air supply pipe 30.

On the other hand, each of the branch pipes 10a ..., 20a ..., 3
0a ... at the end of the sampling bag storage box 10
0 is arranged. 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 back storage box, FIG. 3 is a side view of the sampling back storage box, FIG. 4 is a plan view of the sampling back storage box, FIG. 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 a caster 1 on the bottom.
01 is attached and can be moved.
A heater 102 is disposed at the bottom of the storage box 100, and a fan 102 a is provided near the heater 102 to circulate warm air in the storage box 100.
A uniform temperature atmosphere is set in 0 to prevent dew condensation of the exhaust gas for analysis.

A temperature controller 120 is disposed in the storage box 100 so that the temperature in the storage box 100 is, for example, about 40 ° C., and when the temperature is outside the set temperature, the heater 102 is turned on and off. I'm trying to do it. When the storage box 100 is attached to the main body of the sampling device, the outlet 121 is used to use an AC 100 V AC power supply. Further, while the storage box 100 is separated from the main body of the sampling device and moved, or during standby in the analysis room. Is the storage box 100
The battery provided inside is used as a power source of the heater 102.

The interior of the storage box 100 contains a partition plate 10.
3, a large space on the right side in FIG. 3 can store a total of nine sampling bags 104. The sampling bag 104 is formed of a fluororesin having a low hydrocarbon (HC) generation level.

A bar 104a is bridged over the upper end of the sampling bag 104, and the bar 104a can be moved in the horizontal direction by engaging the bar 104a with a rail 105 provided on the ceiling of the storage box 100. .

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

The upper limit of the lift 112 is regulated by a stopper 114. That is, the stopper 114 is connected to the left and right arms 1.
14a, 114a.
4a is urged in the expanding direction by a spring disposed at the center. Thus, the lifting body 11 is opposed to the gas spring 113.
2 is pushed down together with the stopper 114, the arms 114a, 114a engage with the recesses and the like formed in the rail 111 by the elastic force of the spring, and the lifting block 11 is moved at that position.
2 can be fixed.

Even when the plate 112a moves up and down, the opening 100a formed in the side
, So that the warm air in the storage box 100 does not escape from the opening 100a to the outside.

The guide holder 112b exposed from the opening 100a holds guides 115 of the same number as the number of the sampling bags 104. Guide 1
A flexible pipe 116 made of stainless steel is inserted through 15 so as to be able to be pulled out. This flexible piping 116
A joint 117 is attached to a distal end of the joint, a base end is fixed to a joint provided on the partition plate 103, and one end of a fixed pipe 118 made of stainless steel is connected to the joint. And each sampling bag 104 are connected by a Teflon pipe.

Further, openings 122 are formed in the peripheral portion of the guide holder 112b to blow out 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 structure is such that the tip of the flexible pipe 116 fits in the space surrounded by.

In the above, in order to analyze the exhaust gas from a normal engine, first, the valves 21, 22, 27
, 40a ..., 50a ... are closed and valves 11, 12, 1
, 31, 32, 37... Are opened, the exhaust pipe of an automobile or the like is connected to the exhaust gas supply pipe 4 and the blower 6 is driven.
, And the exhaust gas and the outside air are mixed by the mixing device 7, and a part of the mixed gas is passed through the sampling pipes 10 and the branch pipes 10a.
To be stored.

In parallel with the above, the supply pump 33 provided in the reference outside air supply pipe 30 is driven to store a part of the introduced outside air in each sampling bag 104 via the branch pipe 30a. I do.

Thereafter, the branch pipe 1 is operated by operating the valve 51.
With the analysis pipe 50 from 0a ... connected to the analyzer, the valves 17 ..., 40a ... are closed, the valves 50a ... are opened, and the mixed gas for analysis stored in the bag 104B is passed through the branch pipe 10a ... Is sent back to the analyzer on the bench for analysis.

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

Then, by analyzing the outside air for reference,
Since the ratio of components (eg, nitrogen oxides) originally contained in the outside air can be known, the correction calculation of this value is performed, and the calculated value is subtracted from the analysis result of the mixed gas. You can know the exact amount.

For example, when analyzing components in 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. Then, analysis is usually performed using a special analyzer such as a natural gas analyzer provided separately.

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

The joint 117 is connected to each pipe of the analyzer.
When connecting the flexible pipe 116 to the guide 11
5, the connection work can be performed easily.
In addition, dew condensation is prevented by warming the sampling bag 104 during transfer and standby by the heater 102.

During the connection operation, the inside of the storage box 100 is heated to a relatively high temperature (about 40 ° C.) by the heater 102.
, The warm air in the storage box 100 is blown out from the opening 122 provided on the peripheral edge of the guide holder 112b toward each pipe of the analyzer, and the connection operation is performed in a state where the atmosphere is heated to some degree. . This prevents condensation. When the height of the pipe of the analyzer changes for each model, the lifting guide holder 112b
By adjusting the height of the opening 122 and adjusting the height of the opening 122 to the height of the pipe, the connection work atmosphere can be made 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. Can easily transfer a large number of bags to the analysis room, and since the box itself has a connector unit, it is possible to connect the piping in the box to the analyzer and measure without removing the bags from the box.

Further, by providing the box with a heater, it is possible to prevent the exhaust gas in the bag from dew condensation, and to perform accurate measurement.

Further, a part of the piping provided in the box is a flexible tube, and this flexible tube can be pulled out from the connector unit, thereby connecting and disconnecting from the piping on the sampling device main body side or the piping on the analyzer side. Becomes easier.

Further, if hot air is blown out from the connector unit, it is possible to prevent dew condensation from occurring 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 the 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 the 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 piping, 2 ... outside air intake, 3 ... filter,
4 ... Exhaust gas supply piping, 5 ... Mixed gas distribution piping, 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 ... valve, 13, 2
3, 33 ... supply pump, 15, 25, 35 ... flow meter, 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: caster, 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: Opening for blowing hot air.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Atsushi Shibata 1907, Hirata-cho, Suzuka-shi, Mie Honda Motor Co., Ltd. (72) Inventor Keisuke Ohara 1907, Hirata-cho, Suzuka-shi, Mie Honda Motor Co., Ltd.Suzuka Manufacturing Co., Ltd. Soken (72) Inventor Shuta Yamawaki 1-19-4 Tamatsumi, Setagaya-ku, Tokyo Inside Shisoken

Claims (7)

[Claims] 1. An exhaust gas sampling apparatus wherein an exhaust gas is diluted by outside air, the diluted exhaust gas is temporarily stored in a sampling bag, and the stored diluted exhaust gas is analyzed by an analyzer. An exhaust gas sampling device which is disposed in a box separable from a sampling device main body, and which has a connector unit for connecting and disconnecting a pipe on the sampling device main body side and a pipe in the box. 2. The exhaust gas sampling device according to claim 1, wherein a heater is provided in the box. 3. The exhaust gas sampling device according to claim 1, wherein a flexible pipe in a box is held in the connector unit so as to be able to be pulled out. 4. The exhaust gas sampling device according to claim 1, wherein the connector unit is provided with a hot air outlet in a storage box. 5. The exhaust gas sampling device according to claim 1, wherein the connector unit is provided with an elevating block, and the elevating block holds a flexible pipe in a storage box so as to be able to be pulled out. An exhaust gas sampling device having a hot air outlet formed therein. 6. The exhaust gas sampling device according to claim 1, wherein the storage box includes a temperature controller for maintaining the inside of the box at a constant temperature. 7. The exhaust gas sampling device according to claim 1, wherein the storage box includes a temperature controller for maintaining the inside of the box at a constant temperature, and a battery for driving a heater when moving. A characteristic exhaust gas sampling device.