JPH0318918Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a device for forcibly contaminating a test piece of a tunnel interior plate.

[Prior Art] Looking at the aging of the interior panels currently installed in motorway tunnels, we find that the reflectance of the panels at the time of initial installation decreases due to contamination on the surface of the panels, and despite repeated cleaning, Recovery of reflectance (brightness) by cleaning is gradually getting worse. For this reason, in order to select from the latest materials tunnel interior materials (including coating materials) that are easy to clean and whose surfaces are not easily contaminated and are easy to clean, test pieces of tunnel interior panels were used to conduct various comparative experiments. A forced contamination device was needed to forcibly contaminate the water.

Incidentally, although there has not been a device for forcibly contaminating tunnel interior plate test pieces as described above, a technique similar to this device for testing dust and soot is disclosed in Japanese Patent Application Laid-Open No. 56-39441.

[Problems to be solved by the invention] The conventional dust and soot testing device introduces combustion gas containing dust and soot generated by a dust and soot generator such as an kerosene stove into the test chamber to evaluate product reliability (dust and soot). When this dust and soot testing device is applied to a forced contamination device for tunnel interior plate test pieces, the following problems arise.

The conventional dust and soot testing device introduces only the combustion gas containing dust and soot generated by a dust and soot generator such as an kerosene stove into the test chamber. Even if configured as such, the test piece rotated in the contamination box of this artificial contaminant cannot be contaminated to the same condition as the interior plate installed in an actual tunnel.

That is, the dust and soot generator of the conventional device generates dust and soot by burning petroleum, and the combustion gas containing dust and soot generated by this dust and soot generator and the exhaust gas of automobiles, which is a source of contamination of tunnel interior panels, are Gas has very different gas components depending on the fuel, combustion temperature, etc. Therefore, even if only the combustion gas generated by the dust and soot generator is introduced into the contamination box replacing the test room, the test piece rotated in this contamination box can be used in a manner similar to the interior panel installed in an actual tunnel. Cannot be contaminated by the state.

The conventional dust and soot test equipment introduces only the combustion gas generated by the dust and soot generator into the test room replacement contamination box, so it takes a long time to obtain contaminated pieces with a predetermined concentration. .

The conventional dust and soot test equipment is designed to introduce combustion gas generated in the dust and soot generator into the test chamber by thermal convection (rising air current).
In order to forcibly introduce the combustion gas into the contaminated box for replacing the test chamber, a gas introduction pipe (connecting the dust and soot generator and the test chamber) that includes the dust and soot outlet side of the dust and soot generator is used. A blower must be installed separately in the air pipe), which increases equipment costs.

This idea was devised to solve the above-mentioned conventional problems, and its purpose was to test multiple test pieces contaminated in almost the same condition as the interior panels installed in an actual tunnel in a short period of time (several hours). ) is intended to provide a forced contamination device with a relatively simple structure.

[Means for Solving the Problems] In order to achieve the above object, the forced contamination device for tunnel interior plate test pieces of the present invention includes a contamination box 1 having a gas inlet 11a and an exhaust port 14a.
1 and a motor-driven test piece rotating body 12 for setting and rotating a plurality of contamination test pieces P in the contamination box 11.
, a soot generator 1 that burns oil a to generate soot, and an exhaust gas introduction pipe 4 that introduces incompletely combusted exhaust gas g discharged from a car C into the soot output side of the soot generator 1. Then, a mixed gas gb of the exhaust gas g of the automobile C introduced through the exhaust gas introduction pipe 4 and soot emitted from the soot and smoke generator 1 is introduced into the contamination box 11 of the artificial contaminant 10 at the pollutant side. This configuration includes a conduit 8.

[Function] The forced contamination device with the above configuration
car C (e.g. diesel engine truck)
This is used by connecting to the muffler cm of the car C, and the incompletely combusted exhaust gas g discharged from the car C is introduced into the soot and smoke outlet side of the soot and smoke generator 1, and the exhaust gas g of the car C and the soot and smoke generator are The mixed gas gb of soot and smoke emitted from 1 is passed through the inlet pipe 8 to the artificial pollutant
is introduced into the contaminated box 11. At this time, the test piece rotating body 12 in which a plurality of test pieces P are set is rotating at a low speed by the motor, so that the test pieces P of this rotating body set are exposed to the exhaust gas and soot introduced into the contaminated box 11. mixed gas of
Forcibly contaminated by gb for several hours e.g.
Even after operating the device for ~8 hours, it is possible to easily obtain a test piece P contaminated in a state substantially similar to that of an interior panel installed in an actual tunnel.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. In the figure, 1 is a soot generator that generates soot and smoke by burning oil a such as light oil or kerosene.
An exhaust gas introduction pipe 4 and an air pipe 5 of an automobile C are connected to a soot outlet 3a of a hood 3 covering the combustion wick 2, as shown in FIG.

The exhaust gas introduction pipe 4 is connected to a muffler cm of an automobile C (for example, a diesel engine truck), and after cooling the incompletely combusted exhaust gas g discharged from the muffler cm through a cooling water tank 6, the soot generator 1 It is introduced into the soot outlet side of the
The effluent effect of the exhaust gas pressure passing through the pipe 4 acts to draw the combustion soot gas coming out of the soot generator 1 into the contaminant side feed pipe 8 and send it there. In addition, when the air pipe 5 has a long length of the exhaust gas introduction pipe 4 and the contaminant side feed pipe 8 and the supply gas pressure becomes low, the compressed air by the compressor 7 is contaminated with the exhaust gas/soot mixed gas gb. However, if the lengths of the pipes 4 and 8 are short and the exhaust gas pressure from the automobile C can be used to supply air, the air pipe 5
It is also possible to omit.

The contaminant side feed pipe 8 of the mixed gas gb connects the soot outlet 3a of the soot generator 1 and the gas inlet 11a of the contamination box 11, and is used for heat exchange in the middle of the pipe. The piping section 8a is passed through the water tank 6 to recool the mixed gas gb of exhaust gas and soot. Note that the water cooling of the exhaust gas g and mixed gas gb through the cooling water tank 6 described above is as follows.
This is done for the purpose of adjusting the supply gas temperature in the contamination box 11 to approximate the temperature range in the on-site tunnel, and to prevent overheating and dew condensation of the artificial contaminant 10.

The artificial polluter 10 generates a mixed gas of exhaust gas and soot.
Contamination box 11 into which gb is sent via the pipe 8
is placed on the frame stand 13, and a plurality of (eight in the illustrated example) contamination test pieces P are placed in the contamination box 11.
The structure includes a motor-driven test piece rotating body 12 that is set radially and rotated.

The pollution box 11 is made of a punched metal plate 1 having a large number of exhaust ports 14a attached to the upper end surface of the box body.
4 and a removable lid plate 15 that closes the front opening of the box, and a gas inlet 11a for connecting a pipe is provided at the funnel-shaped lower end of the box. There is. The rotary body 12 also includes eight sets of outer circumferential groove members 1 into which a plurality of contamination test pieces P are removably inserted through the removal opening of the lid plate 15.
6a and a center gutter member 16b, and is supported in a cantilevered manner on the rear end wall of the contamination box 11. The rotation center shaft 17 is rotated in the direction of the arrow in FIG. 1 by an electric motor 18. By rotating it, it rotates at a low speed of about 10 revolutions per minute.

20 is a fly ash supply device that feeds fly ash F as a pollution promoting component into the pollution box 11 together with the mixed gas gb of exhaust gas and soot;
The fly ash supply device 20 is configured to blow air into the fly ash storage box through an air pipe 21, and introduce the fly ash F raised by the blown air into the contaminated box 11 together with the mixed gas gb. There is. Incidentally, since the fly ash supply device 20 is an auxiliary means for promoting forced contamination, it is not necessarily provided in the present apparatus, and may be omitted in some cases.

[Effects of the invention] Since the device for forced contamination of tunnel interior plate test pieces of this invention has the configuration described in the claims for utility model registration, it has the following effects.

The test piece forced contamination device of the present invention introduces the mixed gas gb of the exhaust gas g of the automobile C and the soot emitted from the soot and smoke generator 1 into the contamination box 11 of the artificial contaminant 10 through the feed pipe 8. , unlike conventional dust and soot test equipment that introduces only combustion gas generated by a dust and soot generator such as a kerosene stove into the test chamber, the test piece P that is rotated within the contamination box 11 of the artificial contaminant 10 is actually used. It can be contaminated to the same condition as the interior panels installed in tunnels.

In other words, the combustion gas containing dust and soot generated by the dust and soot generator of the conventional device is different from the exhaust gas of automobiles whose gas components are a source of contamination of tunnel interior panels. Introducing only the combustion gas that has been used to replace the test chamber into the contamination box used to replace the test chamber will not contaminate the test piece rotated in the contamination box to the same condition as the interior panels installed in the actual tunnel. In the case of a device, exhaust gas g emitted from a real car C
The soot and smoke emitted from the soot and smoke generator 1 are mixed, and the mixed gas gb is sent to the pollution box 11 of the artificial contaminant 10.
Since this gas component is introduced into the interior of the tunnel, this gas component approximates the source of contamination of the actual tunnel interior board, and it becomes possible to contaminate the test piece P in a state similar to that of the interior board of the actual tunnel.

In the case of the proposed device, the exhaust gas g of automobile C
Since the mixed gas gb of soot and soot emitted from the soot and soot generator 1 is introduced into the contamination box 11 of the artificial contaminant 10, it is different from the conventional method in which only the combustion gas generated by the dust and soot generator is introduced into the contamination box for replacing the test room. Compared to the apparatus, the contamination efficiency is high and contaminated pieces P at a predetermined concentration can be easily obtained in a short period of time, for example, 7 to 8 hours of operation of the apparatus.

Since the exhaust gas g discharged from the automobile C has a blowing effect due to the exhaust pressure, if the pipes 4 and 8 are short, there is no need to separately install the compressor 7 and a blower having the same function. Contaminated box 11 with mixed gas gb of exhaust gas and soot
Air can be forcibly introduced into the system, simplifying the device structure and reducing equipment costs.

[Brief explanation of the drawing]

Figure 1 is an overall schematic configuration diagram showing one embodiment of the proposed device, Figure 2 is a cross-sectional view of the main parts of the artificial contaminant of the same device, and Figure 3 is a state in which the lid is opened as seen from the right side of Figure 2. FIG. 1... Soot generator, 2... Combustion wick, a... Oil,
3a...Soot outlet, 4...Exhaust gas introduction pipe, 6...
...Cooling water tank, C...Car, g...Car exhaust gas, gb...Mixed gas of exhaust gas and soot, 8...
...Mixed gas contaminant side feed pipe, 10...Artificial contaminant, 11...Contamination box, 11a...Gas inlet,
P...Test piece for contamination, 12...Test piece rotating body, 14a...Exhaust port, 17...Rotation center shaft, 18...Rotation drive motor.

Claims (1)

[Scope of utility model registration request] An artificial contaminant is equipped with a contamination box having a gas inlet and an exhaust port, a motor-driven test piece rotating body that sets and rotates a plurality of contamination test pieces in the contamination box, and an artificial contaminant that burns oil. A soot and smoke generator that generates soot and smoke, an exhaust gas introduction pipe that introduces incompletely combusted exhaust gas discharged from a car into the soot and smoke output side of the soot and smoke generator, and a soot and smoke introduced by the exhaust gas introduction pipe. This is a forced contamination device for a test piece of a tunnel interior plate, which is equipped with a contaminant side feed pipe for introducing a mixed gas of automobile exhaust gas and soot and smoke emitted from a soot and smoke generator into a contamination box of an artificial contaminant.