JPH02176548A - Combustion characteristics detection device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is mainly concerned with measuring and evaluating the combustion characteristics of car vent sheets used in the interior of vehicles such as automobiles, etc., in the combustion characteristics test of regenerative organic materials. It relates to a device for.

[Conventional technology]

Many flammable organic materials are used as interior materials for the interior of automobiles, etc., but when selecting these organic materials, they are tested for combustibility, slow-flammability, self-extinguishing property, combustion rate, and other combustion characteristics. The test method for this combustion test is J.
It is defined by IS standards, such as JISD1201.

That is, the combustion test stipulated in this JIS standard uses a combustion test box 1 as shown in Fig. 5, which has an observation window 2 with a transparent glass on the front and a combustion test chamber 3 inside the box.
For example, a door 4 for putting in and taking out the test equipment is provided, and a door 5 for putting in and taking out the Bunsen burner is provided on the other side, and a frame 6' is provided for mounting the test equipment 6 in the combustion test chamber 3. Appropriate ventilation structure is in place.

On the other hand, the test device 6 consists of two metal plates 6a and 6b, upper and lower, each having a U-shape as shown in FIG.
It is caught in 5b. Further, on the upper surface of the upper metal plate 6a, there are two marked lines A at a certain distance in the longitudinal direction of the test device 6.
, B are drawn.

In the combustion test, the test device 6 with the test piece 7 attached is set on the frame 6', the lit Bunsen burner 8 is inserted into the combustion test chamber 3, and the test piece 7 is placed in the state shown in Fig. 6. After igniting the tip, close both doors 4.5 described above. The person in charge of the test prepares a stopwatch or a timer and visually observes the combustion status of the test specimen 7 through the observation window 2. When the combustion reaches the A mark, turn the stopwatch ONL, and the combustion progresses until the B mark is reached. and OFF L, and measure the time between them.

However, if it disappears in the middle, measure the time from marked line A until it disappears, and the length from marked line A to the charred tip (extinguishing point).

[Problem that the invention seeks to solve]

However, with the method described above, in which the test person visually observes the combustion state with a stopwatch in one hand, one test person has no choice but to work on one combustion test device, which is inefficient. Ta. Also, since there were many measurement items, skill was required, and testing errors were likely to occur. Furthermore, the test pieces contain smoke-emitting substances, which poses health problems for the test personnel as they are exposed to the fumes, and since the test is a visual test, it may not be possible to clearly determine the point of combustion due to soot, etc. The disadvantage was that it was easy to make errors.

In view of the above problems, it is an object of the present invention to provide a combustion characteristic detection device that optically detects the combustion state of a test piece and automatically grasps and records the combustion characteristics.

Means for Solving Problem C] The present invention provides a test device having a combustion test chamber inside, a transparent observation window in front thereof, and a test piece to be subjected to a combustion test set in the combustion test chamber; A combustion test box is equipped with a Bunsen burner for igniting the test piece, and a sensor mounting bar is attached to the outer surface of the observation window of the combustion test box in the same direction as the burning direction of the test piece in the combustion test chamber. A large number of pores are opened at regular intervals in the longitudinal direction of the bar on the surface corresponding to the observation window, and an optical sensor is installed in the inner part of each pore with the sensor head facing the test equipment in the combustion test chamber. In the combustion test chamber, a general sensing optical sensor capable of detecting the presence or absence of flame in the test chamber is installed, and these optical sensors are electrically connected to a device that automatically calculates and records the optical detection signal of the sensor. It is characterized by a combustion characteristic detection device.

[For production]

According to this invention, a test device with a test piece of organic material sandwiched therein is set in the combustion test chamber of a combustion test box, and when one end of the test piece is ignited by a Bunsen burner, an overall sensing optical sensor installed at the top of the combustion chamber detects ignition,
However, a large number of optical sensors are attached to the sensor bar installed on the outside of the observation window at regular intervals in the same direction as the test combustion direction, and the sensor heads of these optical sensors are able to detect the test piece through a small hole with an extremely narrow detection field of view. Since each point is targeted, as the test piece burns, the optical sensor outputs light detection signals caused by the combustion flame one after another, and from these light detection signals, the automatic calculation and recording device calculates the burning speed of the test piece, etc. Automatically calculate and record.

In addition, the combustion time when the fire is extinguished in the middle of the fire is also required as data, and this is detected and calculated by the overall sensing optical sensor.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of the combustion characteristic detection device according to the present invention, where ■ is the same as the conventional combustion test box shown in FIG. Fifth
The same reference numerals as in the figure are given.

A sensor bar 11 is attached to the outer surface of the observation window 2 of the combustion test box 1 using the frame 10 of the observation window so as to be in close contact with the window glass 9. This sensor bar is long in the same direction as the burning direction of the test piece in the combustion test chamber 3, is made of a light-impermeable material (ceramic, for example), and is internally spaced at very narrow intervals in the longitudinal direction of the bar (for example, The optical sensors 12 . . . are arranged and equipped at intervals of one evening).

These optical sensors 12... detect the combustion of the test piece 7 with infrared rays, and the sensor head 12a of each optical sensor 12 detects the combustion direction of the test piece 7 placed in the combustion test chamber 3 through the observation window 2. Aiming for each point.

However, the observation window corresponding surface 11a of the sensor bar 11 has a pore 13 as shown in FIGS. 2 and 3, and the sensor head 12a
is directed from the innermost part of this pore 13 into the combustion test chamber 3, and each sensor head 12a is configured to aim at each limited point in the combustion direction of the test piece 7 at regular intervals (5 fl). . This is because the light detection field of the sensor head 12a is too wide as it is, and the sensor head 12a may pick up external light.
This is because the sensor head 12a detects infrared rays at a portion other than the one point on the test piece 7 targeted by the sensor head 12a.
This is to narrow down the light detection field of view of the test piece 7 so that only infrared rays emitted from each point on the test piece 7 are detected. The pores 13 may have a circular hole, a square hole, or a slit shape, but as shown in FIG. 2, it is preferable to have a slit shape that is long in the vertical direction.

By making the slit shape, the angle of incidence of the light beam on the optical sensor 12 is made small in the direction of sample combustion, making it possible to accurately sense the combustion position, and since the combustion position fluctuates in the direction perpendicular to the direction of sample combustion, This makes it possible to reliably sense it.

In addition, the slit width W in the case of forming these slit shapes is preferably 0.7 to 2 mm. If the width W is less than 0.7n, soot and dust will easily accumulate, and if it is more than 2cm, the angle of incidence of the light beam will become too large and the sensor will sense diagonal light, resulting in a decrease in accuracy and the possibility of sensing other light. be. Furthermore, if the depth within the slit of the sensor head 12a is D, it is desirable that D/W>20.

This is because malfunctions are likely to occur due to other light at the same time.

The sensor bar 11 is equipped with a conducting wire 14 for taking out signals output from each optical sensor 12, and these output signals are sent to an automatic calculation and recording device 16 via a cable 15.15.

Further, as shown in FIG. 4, another overall sensing optical sensor 17 is installed in the upper part of the interior of the combustion test chamber 3 to detect the presence or absence of light, such as whether the test piece 7 is ignited or self-extinguished. The output is also sent to the automatic calculation and recording device 16. The optical sensors 12.17 may be ordinary optical sensors, but preferably infrared sensors.

This is because the flame to be detected is close to infrared light.
It is easy to detect and can minimize malfunctions caused by fluorescent light or daylight.

Furthermore, even if soot or the like adheres to the glass of the observation window due to combustion, the flame detection ability is stronger than that of a visible light sensor, and detection errors are extremely rare.

As specified in the JIS standard, when the test device 6 with the test piece 7 attached is set in the combustion test chamber 3 and one end of the test piece 7 is ignited with the Bunsen burner 8, the optical sensor 1
7 detects ignition and notifies the automatic calculation and recording device 16 that the combustion test has started. When test piece 7 starts burning,
The optical sensor 12 in the sensor bar 11 located at the position corresponding to the marked line A in FIG. Start operation. As combustion progresses, the next sequential optical sensor 12 detects infrared rays, and therefore the automatic calculation and recording device 16 switches from the previous optical sensor ON to the next optical sensor ON.
Calculate and record the time taken.

On the other hand, time counting from the previous turning on of the optical sensor continues. By performing these operations one after another, the combustion progresses to the position corresponding to marked line B in Fig. 6, and this is transferred to the last optical sensor 1.
2 outputs a signal, the automatic calculation and recording device 16 calculates and records the total combustion time between the A and B markers, the individual combustion times between the optical sensors, and the combustion speed, and also prints the data using a printer or the like. Launch.

Further, when the test piece 7 automatically extinguishes during the combustion test, the optical sensor 17 detects this and calculates the above data until self-extinguishing, and also calculates the combustion distance to the self-extinguishing point.

The automatic calculation and recording device 16 is not particularly limited as long as it can perform the calculation and recording process as described above, and it can be used as long as it can process multiple combustion tests simultaneously or display on a CRT. , - layer useful.

〔Effect of the invention〕

As is clear from the above description, the present invention provides the following effects.

Combustion tests are automated and the person in charge of the test does not have to devote all their time to the combustion test of a single vehicle, so multiple combustion tests can be centrally managed at the same time, dramatically improving efficiency.

Since combustion is no longer visually confirmed, test accuracy is improved.

Since the gain of the output signal of the optical sensor can be adjusted in the automatic calculation and recording device, even if the test pieces are made of materials that emit different amounts of infrared rays during combustion, combustion tests can be performed at the optimal detection level that matches the amount of infrared rays emitted during combustion. You can test a wide range of things.

Once the test piece is ignited, there is no need for anyone to do the rest, so the test person can be shielded from harmful combustion gases and the test environment is improved.

In addition to the optical sensor, we also used an overall sensing optical sensor, so
The former optical sensor can detect the presence or absence and time of combustion in a specific location, and the overall sensing optical sensor can measure the exact time of ignition and extinguishment.

[Brief explanation of the drawing]

The drawings show an embodiment of the combustion characteristic detection device according to the present invention, FIG. 1 is a perspective view of the overall appearance, and FIGS. 2(a) (b)
) is a partially enlarged cross-sectional view of the sensor bar, Fig. 3 is an enlarged cross-sectional view of the main part of Fig. 1, Fig. 4 is a cross-sectional view of the combustion test box, and Fig. 5 is a cross-sectional view of the combustion test box specified in the JIS standard. The perspective view, FIG. 6, is also a perspective view of the test instrument. l... Combustion test box, 2... Observation window, 3... Combustion test chamber, 6... Test equipment, 8... Bunsen burner
11...Sensor bar 12.17...Light sensor, 1
2a...Sensor head, 13...Pore, 16...
Automatic calculation recording device. O Fig. So Fig. Fig.

Claims (1)

[Claims] (1) The interior is a combustion test chamber, with a transparent observation window on the front. Inside the combustion test chamber, there is a test instrument with a test piece set for the combustion test, and a Bunsen burner for igniting the test piece. A sensor mounting bar is attached to the outer surface of the observation window of the combustion test box in the same direction as the burning direction of the test piece in the combustion test chamber, and a sensor mounting bar is attached to the observation window-compatible surface of the bar in the longitudinal direction of the bar. A large number of pores are opened at regular intervals, and an optical sensor is installed deep inside each pore with the sensor head facing the test equipment in the combustion test chamber. 1. A combustion characteristic detection device, characterized in that a whole-sensing optical sensor capable of detecting the presence or absence of a flame is installed, and these optical sensors are electrically connected to a device that automatically calculates and records the optical detection signal of the sensor.