JP2536681B2 - Multi-tube split-flow dilution tunnel device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is a multi-tube system in which a test gas is divided at a predetermined ratio, the branched branched gas is diluted, and then the diluted gas is sampled and a component test is performed. Divergence diluting tunnel device.

(Prior Art) For example, in an automobile, in order to prevent air pollution due to exhaust gas,
It is necessary to collect exhaust gas and study the reduction of particulate matter contained in it, and analyze other components. However, a full-volume dilution tunnel that dilutes the entire amount of exhaust gas is a large-scale facility and requires a large amount of cost.Therefore, a diversion dilution tunnel device that uses a small dilution tunnel that diverts part of the exhaust gas is known. ing.

That is, in the diversion dilution tunnel device shown in FIG. 14, the exhaust gas of an automobile is introduced into a surge tank 3 through a multi-pipe type divider 2 composed of a plurality of diversion pipes 1 having the same diameter and the same length, and then the flue gas duct. After that, it is discharged to the outside via 17. One of the downstream ends of the flow dividing pipe 1 is introduced into the dilution tunnel 5 as an introducing pipe 4. A constant volume suction device 6 is provided at the downstream end of the dilution tunnel 5, and the outside air from the upstream end of the dilution tunnel 5 is sucked in through a butterfly valve 24 for adjusting the flow rate and introduced immediately before the mixing orifice 7. The branched split exhaust gas introduced from the pipe 4 is diluted with air as a diluent gas. Fine particles of the diluted gas are sampled by the repair filter 30 and the constant volume sampling device 31, or are collected by the exhaust gas analyzer 32.

According to such a split flow diluting tunnel device, by the action of the split flow pipe, the split split flow exhaust gas can be introduced into the dilution tunnel at a ratio of the number of the split flow pipes. The diluted gas can be sampled and the component tested after dilution with.

(Problem to be Solved by the Invention) However, in such a device, due to the relationship of the fluctuation of the pressure loss of the multi-tube divider 2 due to the fluctuation of the engine output, it is introduced into the diluting tunnel via the introduction pipe 4. The split flow ratio of the branched split exhaust gas flow rate to the total exhaust gas flow rate varies. Therefore, there is a problem that a highly accurate component test cannot be performed, but this problem is solved by giving a pressure loss equal to the fluctuation of the pressure loss of the multi-tube divider with the fluctuation of the total flow rate of exhaust gas to the introduction pipe It is thought that it can be done.

An object of the present invention is, firstly, despite the fluctuation of the total flow rate of the test gas, the test gas that has been shunted accurately with the ratio of the number of the diversion pipes is always introduced into the dilution tunnel so that the exhaust gas A second object is to provide a highly accurate multi-tube type split diluting tunnel device capable of conducting a component test. Secondly, the static pressure at the inlet of the introduction tube and the static pressure at the exit of the multi-tube divider are equalized by the control means. As described above, all the test gases are always shunted accurately with the number ratio of the diversion tubes, and the test gas is introduced into the dilution tunnel to perform the exhaust gas component test with high accuracy. It is intended to provide a multi-tube split-flow dilution tunnel device.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the first aspect of the present invention provides a multi-tube type divider formed by bundling a plurality of flow-dividing tubes having the same diameter and the same length so that the total flow rate of the test gas is While flowing, the downstream end of one of the diversion pipes is introduced as an introduction pipe into the dilution tunnel away from the multi-tube divider, and the dilution gas is introduced from the upstream end of the dilution tunnel. The diluted branched gas introduced through the above-mentioned introduction pipe is diluted and then the diluted gas is sampled and a component test is conducted.In particular, immediately after the outlet of the above-mentioned introduction pipe, the symmetrical distribution is performed around the outlet center line. It is characterized in that a plurality of division ratio control nozzles are provided, each of which has a jet end directed toward the outlet downstream position of the introduction pipe and blows out the dilution gas.

A second aspect of the present invention is a multi-tube type diversion and dilution tunnel device as set forth in claim 1, and in particular, a surge tank that joins the outflow gas from a diversion pipe bundle other than the above-mentioned introduction pipe to the outside air via a butterfly valve. It is characterized in that it is made to communicate with the conduction path.

A third aspect of the present invention is a multi-tube split flow diluting tunnel device according to the first aspect of the present invention, and in particular, the center lines of the plurality of split ratio control nozzles and the outlet center line of the downstream outlet of the introduction pipe. The intersection angle is set to 40 ° to 50 °.

In a fourth aspect of the present invention, the total flow rate of the test gas is passed through a multi-tube divider formed by bundling a plurality of flow dividing pipes having the same diameter and the same length, and one downstream end of the flow dividing pipe is used as an introducing pipe. Introduced into the dilution tunnel away from the multi-tube divider, after diluting the branched diverted gas introduced through the introduction pipe with the dilution gas introduced from the upstream end of the dilution tunnel, the diluted Gas sampling and component testing are performed, and in particular, immediately downstream of the outlet of the inlet pipe, symmetrically arranged around the outlet center line, and diluted toward the outlet downstream position of the inlet pipe. A plurality of split ratio control nozzles that blow out gas are provided, and a high pressure dilution gas supply source is connected to the split ratio control nozzles through a jet amount control valve that adjusts the jet amount of the control nozzles. Connected to the quantity control valve And control means, characterized in that generates an output to be equal and the static pressure of the static pressure and the multitubular divider outlet of the inlet pipe outlet.

A fifth aspect of the present invention is a multi-tube type split diluting tunnel device according to claim 1 or 4, which is attached to the inlet pipe outlet and the diversion pipe outlet in the multi-tube divider, respectively. Each static pressure detector is arranged at a position upstream of the respective outlet ends by the inner diameter of each of the pipes or more.

A sixth aspect of the present invention is a multi-tube type split diluting tunnel device as set forth in claim 1 or 4, and particularly, each of the introduction pipe outlet and the diversion pipe outlet in the multi-tube divider. A plurality of static pressure detectors are arranged at the same position in the longitudinal direction of each of the pipes, and each average static pressure information is output to the control means.

(Operation) According to the first invention, the plurality of division ratio control nozzles
When the diluent gas is blown out toward the position immediately after the downstream outlet of the introducing pipe, the static pressure at the introducing pipe outlet increases or decreases. Therefore, make the static pressure at the introducing pipe outlet equal to the static pressure at the multi-tube divider. be able to.

According to the second aspect of the invention, when the butterfly valve is opened and closed, the static pressure at the outlet of the multi-tube divider other than the introduction pipe increases or decreases. Can be higher.

According to the third aspect of the invention, since the crossing angle is set to 40 ° to 50 °, the static pressure at the outlet of the introduction pipe fluctuates linearly as the pressure of the dilution gas from the split ratio control nozzle increases. Become.

According to the fourth aspect of the present invention, the control means adjusts the increase / decrease of the ejection amount of the split ratio control nozzle via the ejection amount control valve, and particularly, the static pressure at the inlet of the introduction pipe and the static pressure at the outlet of the multi-tube divider. Since the outputs are generated so that the two become equal to each other, the division ratio of the test gas and the branched split gas is always constant.

According to the fifth aspect of the invention, since each static pressure detector is arranged at a position upstream of the inner diameter of each pipe from the inlet end of the introduction pipe and the outlet end of the branch pipe outlet in the multi-tube divider, variations in detected pressure occur. Can be reduced.

According to the sixth aspect of the invention, a plurality of static pressure detectors are arranged at the same position in the longitudinal direction of each pipe, and the average static pressure information is output to the control means. Can be reduced.

(Examples) Examples of the present invention will be described with reference to the drawings.

First, in FIG. 1, the same reference numerals as those in FIG. 12 denote the same members as those in FIG. 12, and the duplicate description thereof will be omitted.

The point that the apparatus of the first embodiment is substantially different from the conventional apparatus of FIG. 14 is that a split ratio control nozzle 10 is provided between the downstream end of the introduction pipe 4 and the mixing orifice 7.
Moreover, a high-pressure dilution gas supply source 19 is connected to the division ratio control nozzle 10 via an ejection amount control valve 18 for adjusting the ejection amount of the control nozzle.

As the ejection amount control valve 18, an electropneumatic converter that increases or decreases the pressure value of the supply gas according to the electric signal Du is used. High pressure air is used as the high pressure dilution gas, and an air tank or the like to which high pressure air is appropriately replenished is used as the high pressure dilution gas supply source 19.

In the multi-pipe type diversion dilution tunnel device of FIG. 1, the static pressure detectors 20 and 21 are used to obtain the inlet pipe outlet static pressure Ps2 and the multi-pipe type divider outlet static pressure Ps3, and the static pressure detector 23 is used for high-pressure dilution. The gas pressure P4 is obtained, and these detected values are output to the controller 12.

Static pressure detectors 20 and 21 are provided to measure static pressures at the outlet of the introduction pipe 4 (see FIG. 2) and the outlet of the multi-tube divider 2. The detection unit 201 of the static pressure detector 20 is disposed at a position (here, about 2 × d) above the inner diameter d of the pipe from the outlet end of the pipe. As a result, it is possible to reduce variations in the detected pressure due to pulsating flow or the like. Further, four detectors 201 are annularly arranged at the same position in the longitudinal direction of the pipe, with a predetermined interval therebetween. Then, the four detectors 201 (only two of which are shown in FIG. 2) are merged at positions separated by a predetermined length, as shown in FIG. 2, where an average static pressure is obtained, and The mean static pressure Ps2 is detected. Due to the co-operation of the plurality of detecting units 201 and the merging unit 202,
Further reduces variations in detected pressure. You have reliable information. As with the static pressure detector 20 shown in FIG. 2, the static pressure detector 21 at the outlet of the multitubular divider 2 is also the detector 211.
And a merging portion 212 is configured.

In FIG. 1, pipes are respectively connected to the respective division ratio control nozzles 10 arranged in the dilution tunnel 5, and the outer ends thereof are, as shown in FIGS. 4 and 5,
It penetrates the dilution tunnel 5. The division ratio control nozzle 10 is arranged so that its center line l1 and the outlet center line l2 of the outlet of the introduction pipe 4 face each other at an intersection angle θ (here, set to 45 ° for the following reason). The hole is located at a point at a distance X from the outlet of the introduction pipe 4. Therefore, the division ratio control nozzles 10 facing each other around the outlet center line 12 are oriented axially symmetrically toward the outlet downstream position of the introduction pipe 4.

The split ratio control nozzle 10 here has eight inner diameters of about 2 mm, and the introduction pipe 4 has an inner diameter of about 10 mm. The nozzle hole of the split ratio control nozzle 10 is located 10 mm away from its downstream outlet. Will be deployed.

When the high-pressure dilution gas pressure P4 is adjusted by the injection amount control valve 18 after the parameters of the split ratio control nozzle of FIG. 1 are set in this manner, as shown in FIG. The change characteristics of the inlet pipe outlet static pressure Ps2 and the above-mentioned multi-tube divider outlet static pressure Ps3 can be obtained. In this case, in particular, since the inlet pipe outlet static pressure Ps2 changes substantially linearly with respect to the high-pressure dilution gas pressure P4, there is controllability to match the inlet pipe outlet static pressure Ps2 with the multi-tube divider outlet static pressure Ps3. It will be excellent.

The intersection angle θ between the center line 11 of the division ratio control nozzle 10 and the outlet center line 12 of the outlet of the introduction pipe 4 has a degree of freedom in the range of 0 ° ≦ θ ≦ 180 °. However, as shown in FIG. 6, when the intersection angle θ is set to about 45 ± 5 ° (type a), when the intersection angle θ is set to around 90 (type b), the intersection angle θ is 135. In the case where the temperature is set in the vicinity of ° C (type c), the change characteristic of the inlet pipe outlet static pressure Ps2 greatly differs from the high pressure dilution gas pressure P4 at that time.

That is, as shown in FIG. 6, in the type a, the inlet pipe outlet static pressure Ps2 is linear and easy to control, but in the type b, the controllability before and after the peak is particularly poor, and in the type c, it is nonlinear and the inlet pipe outlet is The fluctuation range of static pressure ps2 is large and difficult to control. Moreover, when the jets from the introduction pipe 4 and the split ratio control nozzle 10 collide with each other, if the crossing angle θ is too small, it is difficult to increase the introduction pipe outlet static pressure Ps2. The spread becomes large, pulsating flow is likely to occur, and the controllability is deteriorated. Particularly, when the spread of the confluent jet is large, a part thereof collides with the euphis 7 and becomes unsuitable for measurement of particulate matter.

Further, in the apparatus of FIG. 1, when the high pressure dilution gas pressure P4 of the split ratio control nozzle 10 is changed, the inlet pipe outlet static pressure Ps2 changes, and the change greatly changes depending on the configuration of the split ratio control nozzle 10.

That is, the curve plotted with □ in FIG. 8 is the number of nozzles 8 and θ = 60 °, and when the division ratio control nozzle of X = 0 mm is adopted, the curve plotted with ◯ is 8 nozzles and θ = 45.
When a division ratio control nozzle of ° and X = 0 mm is adopted, the curve plotted with Δ marks is 8 nozzles, θ = 30 °, X = 0 mm
This is the characteristic when the division ratio control nozzle of is adopted.

In the curve marked with □, high pressure dilution gas pressure P4 = 1.0 kg / cm ² , P
It reaches s2 = Ps3, reaches a peak near P4 = 1.8kg / cm ² , and then decreases, while the curve marked with ○ shows P4 = 1.5kg / cm ²
Then, Ps2 = Ps3 and P4 = 2.5kg / cm ² shows linear characteristics. In the curve marked with Δ, Ps2 = Ps3 does not hold even if P4 = 2.5kg / cm ² . Therefore, it was found that the curve marked with ○ is the easiest to use, and the curve marked with □ is next.

For reference, FIG. 9 shows the same curve as the one in FIG. 8 marked with a circle. Here, Δ indicates the number of nozzles is 4, θ = 45
When the split ratio control nozzle of ゜ and X = 0mm is adopted, □ indicates the case where the number of nozzles is 8, θ = 45 °, and the split ratio control nozzle of X = 10mm is adopted. P4 = 2.5kg / cm ² As P
s2 = Ps3 does not hold.

From the above results, it is better to use 8 nozzles than 4 nozzles, and it is practical for θ to be in the range of 40 ° to 60 °.
= 0mm is practical. Therefore, the split ratio control nozzle 10
By changing the high-pressure dilution gas pressure P4, the inlet pipe outlet static pressure Ps2 changes, so by controlling the high-pressure dilution gas pressure P4 so that Ps2 = Ps3 Regardless, it is possible to always introduce exhaust gas with a constant flow rate into the dilution tunnel.

The apparatus of FIG. 1 inputs each pressure information of the inlet pipe outlet static pressure Ps2, the multi-tube divider outlet static pressure Ps3, and the high pressure dilution gas pressure P4 to the controller 12 by the static pressure detectors 20, 21, and 23. The controller 12 controls the ejection amount control valve 18 so that Ps2 = Ps3. Note that FIG. 11 shows the pressure control process performed by the controller 12 of the apparatus shown in FIG.

Here, in advance, operate the butterfly valve 24,
Ensure the operating condition of Ps2 ≤ Ps3. Moreover, the differential pressure detector 11
Depending on the inlet pipe outlet static pressure Ps2 and the multi-tube divider outlet static pressure Ps3
The differential pressure ΔP is constantly calculated.

The controller 12 fetches the differential pressure ΔP information in step a1, and the high pressure dilution gas pressure sufficient to eliminate this differential pressure ΔP.
Calculate the output value Du that can obtain P4 from the map in Fig. 10, output the output value Du to the injection amount control valve 18, switch the high pressure dilution gas pressure P4 value, and adjust the inlet pipe outlet static pressure Ps2. Then, Ps2 = Ps3 can be automatically set.

In this way, if Ps2 = Ps3, the introduction pipe and the flow dividing pipes of the multi-tube divider have completely the same conditions both in terms of dimensions and hydrodynamics, so that exhaust gas of the same flow rate It will flow despite the fluctuation of the total exhaust flow rate. Therefore, it is possible to always divide the exhaust gas at a constant division ratio, guide the branched split gas into the dilution tunnel 5, sample the diluted gas after dilution, and analyze the gas.

In the multi-tube type split diluting tunnel device shown in FIG. 1, the outflow gas of the multi-tube type divider 2 was directly discharged to the flue 17 as an external air passage, but such flue 17 has a plurality of test benches. When exhaust gas is introduced and multiple engine tests are performed at the same time, exhaust interference may occur through the flue 17, which may make precise shunting difficult.
Therefore, in FIG. 12, the exhaust gas from the multi-tube divider 2 is passed through the surge tank 15 and the butterfly valve 16 to the flue 17
A multi-tube type split diluting tunnel device having a structure to be introduced into the flue and to be discharged to the outside air from the flue 17 is shown.

Here, the static pressure detectors 20, 21, 22, 23 are used to introduce the inlet pipe outlet static pressure Ps2, the multi-tube divider outlet static pressure Ps3, and the divider inlet pressure P1.
And high-pressure dilution gas pressure P4 are calculated, and each information is the controller
Entered in 25. High pressure dilution gas pressure P4 is the injection amount control valve 18
It is controlled by the controller 25 via.

Well-known electric actuators 26 and 27 are attached to the butterfly valve 24 on the inlet side of the dilution tunnel 5 and the butterfly valve 16 downstream of the surge tank 15, and they are opened according to the output value from the controller 25. It is configured to increase or decrease the degree.

By the way, in the apparatus shown in FIG. 12, the pressure characteristics of the apparatus (not shown) in which the number of divided tubes of the multi-tube type divider 2 is 91 and the division ratio is set to 91 is shown in FIG. ing.
Here, the surge tank internal pressure P3 of the surge tank 15 was increased or decreased by adjusting the valve opening degree at the outlet thereof. As a result, the divider inlet pressure P1 and the inlet pipe outlet static pressure Ps2. The static pressure Ps3 at the outlet of the multi-tube divider and the pressure P2 before the mixing orifice each showed the characteristics shown in FIG.

Here, in the operating range of Ps2 = Ps3, the division ratio was exactly 91, and at this time, P2 ≠ P3. This shift tendency was more remarkable as the divider inlet pressure P1 increased. Therefore, it was confirmed that reliable test results can be obtained by controlling this device based on the inlet pipe outlet static pressure Ps2 and the multitubular divider outlet static pressure Ps3.

The controller 25 here performs a pressure control process as shown in FIG.

That is, when the controller 25 starts, first, the ejection amount control valve 18 is closed, the actuators 26 and 27 are set to the fully open positions, and other initial settings are made, and various data such as the static pressure detector is read. Then, in step b3, it is checked whether or not the high-pressure dilution gas pressure P4 is pressurized, and before being supplied, the process proceeds to step b4, where the introduction pipe outlet static pressure Ps2 is set to the multi-pipe type divider outlet static pressure. It is determined whether or not the pressure Ps3 is higher. If it is higher, the process directly proceeds to step b6. If not, the butterfly valve 24 is closed by a predetermined amount in step b5, and step b4 is performed again.

When the high pressure dilution gas pressure P4 is supplied in step b3 and b6 is reached from step b3, ΔP = Ps2-Ps3 is calculated, and if ΔP <0, the output value Du is calculated so as to increase P4, and the same output The injection amount control valve 18 is driven with the value Du, and if ΔP> 0, the output value Du is calculated so as to lower P4, and the injection amount control valve 18 is driven with the same output value Du. If ΔP = 0, the process ends.

By this pressure control process, the differential pressure ΔP is eliminated, and Ps2 = Ps3 can be automatically set.

Therefore, it is possible to always divide the exhaust gas at a constant division ratio, guide the branched split gas into the dilution tunnel 5, sample the diluted gas after dilution, and analyze the gas.

(Effects of the Invention) As described above, according to the first invention, the high-pressure dilution gas is blown from the split ratio control nozzle to the downstream outlet of the introduction pipe,
Since the static pressure at the outlet of the inlet pipe and the static pressure at the outlet of the multi-tube divider can be made equal, the exhaust gas is always divided and diluted at a constant split ratio, regardless of fluctuations in the total exhaust gas flow rate. The diluted gas can be sampled and the component test of the test gas can be performed, and a highly precise multi-tube split flow dilution tunnel device can be obtained.

According to the second aspect of the present invention, since the opening / closing valve between the surge tank and the outside air passage is opened / closed, the static pressure at the outlet of the multi-tube divider can be made higher than the static pressure at the outlet of the introduction pipe. Pressure adjustment is facilitated, and the adverse effect of disturbance due to pressure fluctuations on the outside air passage side can be eliminated.

According to the third aspect of the present invention, the static pressure at the outlet of the inlet pipe fluctuates linearly as the pressure of the high-pressure dilution gas from the split ratio control nozzle whose crossing angle is set to 40 ° to 50 ° increases. The control of matching the inlet pipe outlet static pressure with the multi-tube divider outlet static pressure is facilitated.

According to the fourth aspect of the present invention, the control means that receives the static pressure information at the inlet of the introduction pipe and the static pressure information at the outlet of the multi-tube type divider increases or decreases the ejection amount of the split ratio control nozzle via the ejection amount control valve. Adjustment is performed so that the static pressure at the outlet of the inlet pipe and the static pressure at the outlet of the multi-tube type divider are automatically made equal, so that the exhaust gas is always split at a constant split ratio, regardless of fluctuations in the total exhaust gas flow rate. , The diluted gas can be sampled and the component test of the test gas can be performed, and a highly accurate multi-tube split flow dilution tunnel device can be provided.

According to the fifth aspect of the present invention, each static pressure detector disposed at a position upstream of the inner diameter of each pipe from the outlet end of the introduction pipe outlet and the branch pipe outlet in the multi-tube divider has a variation in detected pressure. Since the number is reduced, it is possible to obtain a reliable and highly accurate multitubular split-flow dilution tunnel device.

According to the sixth invention, since each static pressure detector in which a plurality of detecting units are arranged at the same position in the longitudinal direction of each pipe emits each average static pressure information, it is possible to reduce the variation in the detected pressure. It is possible to provide a reliable and highly precise multi-tube split-flow dilution tunnel device.

[Brief description of drawings]

FIG. 1 is an overall schematic structural side view of a multi-tube type split diluting tunnel device as a first embodiment of the present invention, FIG. 2 is a cross-sectional view of the main part of the static pressure detector in FIG. 1, and FIG. A characteristic diagram of pressure change by a static pressure detector, FIGS. 4 (A) and 4 (B) are partially enlarged views showing a portion II in FIG. 1, and FIGS. 5 (A) and 5 (B) are respectively FIG. III-III line arrow view of FIG. 6, (a),
(B) and (c) are explanatory views of different arrangement examples of the split ratio control nozzle 10, and FIG. 7 shows the introduction pipe outlet static pressure corresponding to FIGS. 4 (a), (b) and (c), respectively. Characteristic diagram, Fig. 8,
FIG. 9 shows the dilution gas pressure P4 in the apparatus of FIG. 1, respectively.
Showing the relationship between the inlet pipe outlet static pressure P2 and the multi-tube divider outlet static pressure P3, FIG. 10 is an output calculation map of the injection amount control valve performed by the controller of FIG. 1, and FIG. 11 is FIG. FIG. 12 is a flow chart of the pressure control process performed by the device of FIG. 12, FIG. 12 is a schematic configuration diagram of a multi-tube split flow dilution tunnel device as a second embodiment of the present invention, and FIG. 13 is a diagram of the pressure control process performed by the device of FIG. A flowchart, FIG. 14 is an overall schematic configuration diagram of a conventional device. 1 ... Diversion pipe, 2 ... Multi-tube type divider, 4 ... Introduction pipe, 5
…… Dilution tunnel, 6 …… Constant volume suction device, 7 …… Mixing orifice, 10 …… Split ratio control nozzle,
11 …… Differential pressure detector, 12,25 …… Controller, 19 …… High pressure dilution gas supply source, 15 …… Surge tank, 17 …… Flue,
18 …… Blowout control valve, 24,27 …… Butterfly valve, θ
...... Cross angle, Ps2 …… Inlet pipe outlet static pressure, Ps3 …… Multi-tube divider outlet static pressure, P4 …… High pressure dilution gas pressure, P1 …… Split inlet pressure.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Izumi Fukano 5-3-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Corporation (56) References JP-A 64-31032 (JP, A) JP 1-302134 (JP, A) JP-A-1-155235 (JP, A) Actually developed 60-127420 (JP, U)

Claims (6)

(57) [Claims] 1. The whole flow rate of a test gas is caused to flow through a multi-tube type divider formed by bundling a plurality of flow dividing pipes having the same diameter and the same length, and one downstream end of the flow dividing pipe is used as an introducing pipe. Introduced into the dilution tunnel away from the multi-tube divider, after diluting the branched diverted gas introduced through the introduction pipe by the dilution gas introduced from the upstream end of the dilution tunnel, the diluted gas In a multi-pipe type diversion dilution tunnel device for sampling and component testing, immediately downstream of the outlet of the inlet pipe, symmetrically arranged around the outlet center line, the ejection ends are located at the outlet downstream positions of the inlet pipe. A multi-tube split flow diluting tunnel device comprising a plurality of split ratio control nozzles that blow out a high-pressure dilution gas in a directed manner. 2. A multi-tube type diversion and dilution tunnel device as set forth in claim 1, wherein a surge tank that joins the outflow gas from the diversion pipe bundle other than the introduction pipe is connected to an outside air passage via an opening / closing valve. A multi-tube type split diluting tunnel device characterized in that it is connected to. 3. The multi-tube split flow dilution tunnel device according to claim 1, wherein a crossing angle between a center line of the plurality of split ratio control nozzles and an outlet center line of a downstream outlet of the introduction pipe is A multi-tube split-flow dilution tunnel device characterized by being set at 40 ° to 50 °. 4. The total flow rate of the test gas is caused to flow through a multi-tube type divider formed by bundling a plurality of flow dividing pipes having the same diameter and the same length, and one downstream end of the flow dividing pipe is used as an introducing pipe. Introduced into the dilution tunnel away from the multi-tube divider, after diluting the branched diverted gas introduced through the introduction pipe by the dilution gas introduced from the upstream end of the dilution tunnel, the diluted gas In a multi-tube split-flow dilution tunnel device that performs sampling and component testing, the pipes are symmetrically arranged around the outlet center line immediately after the outlet of the inlet pipe, and the outlet downstream positions of the inlet pipes are oriented. A plurality of division ratio control nozzles for ejecting high pressure dilution gas are provided, and a high pressure dilution gas supply source is connected to the division ratio control nozzle via an ejection amount control valve that adjusts the ejection amount of the control nozzle. It A multi-tube split-flow diluting device, characterized in that the control means connected to the jet amount control valve outputs so that the static pressure at the outlet of the introduction pipe and the static pressure at the outlet of the multi-tube divider are equal. Tunnel equipment. 5. A multitubular split diluting tunnel device according to claim 1 or 4, wherein each static pressure attached to the inlet pipe outlet and the split pipe outlet in the multitubular divider. A multi-tube split-flow dilution tunnel device, characterized in that the detectors are arranged at positions upstream of the inner diameters of the respective pipes from the respective outlet ends. 6. A multitubular split diluting tunnel device according to claim 1 or 4, wherein each static pressure detector at the inlet of the inlet pipe and at the outlet of the split pipe in the multitube divider. Is provided at the same position in the longitudinal direction of each of the pipes, and the average static pressure information is output to the control means.