JP3805896B2 - Smoke generator for wind tunnel test equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a smoke generator for visualizing and observing the state of airflow in a wind tunnel experimental facility, and more particularly to an apparatus for continuously generating smoke.
[0002]
[Prior art]
Conventional smoke generators for wind tunnel experimental equipment apply fuming oil around the electric heater wire and then generate heat by energizing the electric heater wire to burn the fuming oil around the electric heater wire to generate smoke. The so-called smoke wire method is usually used, but in such a device using smoke wire method, the generation of smoke is not performed continuously but ends instantaneously. There was a problem that it could not be observed.
[0003]
For this reason, the inventor of the present application has studied a device that continuously generates smoke. As a result, the inventor is a kind of fuming oil, sold by MOLE-RICHARDSON CO. “Fog Juice” (trade name), an oil that is harmless to the human body that has been frequently used in movie shooting, is continuously supplied to the heating section and continuously smoked. A device to generate it automatically was devised and put into practical use in a wind tunnel experimental facility.
[0004]
This device has a tank for storing the fog juice that can be sealed at the inlet, an air supply pipe for supplying air pressure from the compressor into the tank, and generation and ejection of smoke having a heating section in the middle. An elongated stainless steel pipe, an oil supply pipe connecting one end of the stainless steel pipe and the tank, and a power feeding part for feeding power to the heating part, the heating part corresponding to the stainless steel pipe Electrodes are provided at both end positions of the part extending over the length of the electrode, and a direct current is supplied to the electrodes from the power feeding part to cause the part between the electrodes of the stainless steel tube to generate heat due to its electrical resistance. The fog juice that passes through is heated and burned.
[0005]
According to such an apparatus, the air pressure is supplied from the compressor into the tank through the air supply pipe and the inside of the tank is pressurized, whereby the fog juice in the tank is continuously fed into the stainless steel pipe through the oil supply pipe. In addition to pressure feeding, a DC current is supplied from the power feeding unit to the heating part of the stainless steel tube to generate heat, and fog juice passing through the heating part can be continuously burned. And can be ejected from the other end of the stainless steel tube.
[0006]
The above fog juice is used here because when the normal oil such as kerosene or engine oil is burned in the stainless steel tube for a long time, the inside of the stainless steel tube gradually narrows with the residue, and the smoke generation performance decreases. This is because the fog juice does not generate residue due to its combustion and adheres to the stainless steel pipe. Also, the air pressure is supplied into the tank by the compressor and the fog juice is pumped into the stainless steel pipe. By maintaining a constant value, the amount of fog juice supplied to the stainless steel tube per unit time can be stabilized and fluctuations in the amount of smoke generated can be easily prevented, and the wind tunnel test equipment is equipped with a compressor. Because there are many cases, it can be used in many cases.
[0007]
[Problems to be solved by the invention]
However, in the above-mentioned device of the present inventor, since it is necessary to supply air pressure into the tank by a compressor, the device cannot be operated when the wind tunnel test facility is not equipped with a compressor. In addition, since air pressure is used, there is a disadvantage that the possibility of tank destruction due to excessive air pressure cannot be completely eliminated.
[0008]
[Means for solving the problems and their functions and effects]
An object of the present invention is to provide a smoke generator that advantageously solves the above problems. A smoke generator for wind tunnel experimental equipment according to the present invention includes a tank for storing fog juice, and a smoke generator. A metal pipe, a heating section for heating the fog juice passing through the inside of the metal pipe, an oil supply pipe connecting one end of the metal pipe and the tank, and feeding the heating section with the heating section In a smoke generator for wind tunnel experiment equipment comprising a power feeding unit for generating heat, a plurality of rollers driven by a power source and circulated on a predetermined movement path, and a shape along at least a part of the predetermined movement path A tubing pump having a flexible pipe holding portion, and at least a part of the oil supply pipe is constituted by a flexible pipe, and the flexible pipe of the oil supply pipe is formed by the tubing pump. The held in flexible tube holding portion, and is characterized in that as squeezing without interruption in the plurality of rollers.
[0009]
In such a device, a plurality of rollers of a tubing pump, which are driven by a power source and circulate and move on a predetermined movement path, are held by a flexible pipe holding portion of the tubing pump for generating smoke. By continuously handling the flexible tube that forms at least a part of the oil supply pipe that connects one end of the metal pipe and the tank for storing the fog juice, the fog juice in the oil supply pipe is continuously put into the metal pipe. The heating unit fed from the power feeding unit heats the fog juice passing through the inside of the metal tube and continuously burns it, so that continuously generated smoke is ejected from the other end of the metal tube. The
[0010]
Therefore, according to this apparatus, smoke can be continuously generated and supplied to the wind tunnel experimental equipment, and the unit time of fog juice into the metal pipe can be provided without supplying air pressure into the tank by the compressor. Since the per capita supply amount can be stabilized, the device can be operated even when the wind tunnel test equipment is not equipped with a compressor, and since the air pressure is not used, the tank is destroyed due to excessive air pressure. The possibility can be completely eliminated.
[0011]
The heating unit in the apparatus of the present invention is provided with electrodes at both end positions of at least a part of the metal tube, and the metal tube between the electrodes is its own by a current supplied from the power feeding unit to the electrodes. It may be configured to generate heat due to electric resistance. According to such a heating unit, the fog juice passing through the metal tube can be easily and safely heated with a simple configuration.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a smoke generating apparatus for wind tunnel experimental equipment according to the present invention, and FIGS. 2 (a) and 2 (b) are respectively a portion A and a portion B in FIG. It is sectional drawing expanded and shown.
[0013]
As shown in FIG. 1, the smoke generating apparatus for wind tunnel experimental equipment of this embodiment has a tank 2 for storing fog juice 1 and a length for generating and ejecting smoke as a metal tube for generating smoke. An elongated stainless steel tube 3 having an inner diameter of 2 mm and an inner diameter of about 1 mm, a heating unit 4 provided in the middle of the stainless steel tube 3 for heating the fog juice 1 passing through the inside of the stainless steel tube 3, and an upper end of the stainless steel tube 3 In this embodiment, as an oil supply pipe connecting the tank 3 to the tank 3a, the tube 5 made of a flexible resin such as silicon is used over the entire length, and the heating unit 4 is fed to generate heat. The stainless steel tube 3 here is smoothly bent by about 90 ° at a position closer to the lower end 3b than the heating unit 4.
[0014]
In this embodiment, the heating unit 4 has electrodes 7 and 8 fixed to both end positions of the intermediate portion of the stainless steel tube 3 extending from the vicinity of the upper end 3a of the stainless steel tube 3 to the most part thereof, respectively. This is because the stainless steel tube 3 between the electrodes 7 and 8 is heated by a direct current supplied from the power supply unit 6 to the electrodes 7 and 8 due to its own electrical resistance. The power supply unit 6 in the embodiment is configured by a normal AC-DC converter, converts 100V alternating current supplied as a power source from the wind tunnel experimental facility to about 48V direct current, and supplies the electrodes 7 and 8 with power.
[0015]
In order to protect the user of the apparatus from the heat generated by the heating unit 4 and electrically insulate the heating unit 4 from other parts, in this embodiment, as shown in FIG. The portion of the heating part 4 of the stainless steel tube 3 is accommodated in an insulating cylinder 9 made of ceramic, and the insulating cylinder 9 is further accommodated in a copper tube 10. As shown in FIG. 2 (a), a ceramic insulating plug 11 with the stainless steel tube 3 inserted in the center is screwed in, and the lower end of the copper tube 10 is shown in FIG. 2 (b). In addition, the copper electrode 8 having the stainless steel tube 3 inserted in the center is screwed on.
[0016]
At the lower end of the electrode 8, a fixing nut 13 having a taper surface on the inside and containing a chuck member 12 slidingly in contact with the taper surface is screwed into the electrode 8, and the fixing nut 13 is screwed into the electrode 8. The chuck member 12 stopped by the electrode 8 is moved toward the center of the fixing nut 13 along the inner tapered surface of the fixing nut 13 and penetrates through the central portion of the fixing nut 13. 3 is clamped and fixed. Therefore, the upper and lower ends of the heating part 4 are supported by the copper pipe 10 via the insulating plug 11 and the electrode 8, and the lower end of the heating part 4 is connected to the copper pipe 10 via the fixing nut 13. It is fixed.
[0017]
Further, the upper and lower ends of the copper pipe 10 are fixed to the upper and lower ends of the support cylinder 14 having an airfoil cross-sectional shape so as not to disturb the air flow in the wind tunnel experimental equipment, respectively. The supporting cylinder 14 is placed at an appropriate position in the wind tunnel experimental facility.
[0018]
Further, the apparatus of this embodiment sucks the fog juice 1 in the tank 2 into the tube 5 made of the flexible resin and continuously sends it to the upper end portion 3a of the stainless tube 3, as shown in FIG. In addition, it has a so-called tubing pump 17 that has recently been used for the transfer of chemicals in the field of medical equipment, and the tubing pump 17 is rotated in the direction indicated by the arrow by an electric motor (not shown) as a power source. A circular movement path (identical to the circle) which is rotatably supported at a position on a circle C concentric with the disk 18 on the driven disk 18 and coincides with the circle C by the rotation of the disk 18. As a flexible tube holding part, it has a plurality of (three in the illustrated example) rollers 19 that circulate and move on a circular movement path C and a holding surface 20a shaped along a part of the circular movement path C. Tube holding block 20 There.
[0019]
In the apparatus of this embodiment, the tube 5 made of the flexible resin is attached to the holding surface 20a of the tube holding block 20 of the tubing pump 17 and held by the tube holding block 20 as shown in FIG. However, the tube 5 is handled without interruption by the plurality of rollers 19 moving along the circular movement path C so that at least one roller 19 always holds the tube 5 between the roller 19 and the holding surface 20a. I am trying to
[0020]
In addition, in the apparatus of this embodiment, the type 1964 fog juice of the United States Mol Richardson company described in the column of the prior art is used as the fog juice 1, and this fog juice is used for general work and experiments. It has been found that there is no problem in terms of toxicity even if it is used for a variety of purposes, for example, through decades of experience in movie shooting and the results of analysis by specialized agencies in the United States.
[0021]
In the apparatus of this embodiment, the plurality of rollers 19 that are driven by the motor of the tubing pump 17 and circulate on the circular movement path C are held by the tube holding block 20 of the tubing pump 17. By handling the flexible tube 5 without interruption, the fog juice 1 in the tube 5 connecting the upper end 3a of the stainless tube 3 and the tank 2 is continuously fed into the stainless tube 3, The heating unit 4 fed with a direct current heats the fog juice 1 passing through the inside of the stainless steel tube 3 and continuously burns it. As a result, smoke continuously generated from the lower end 3b of the stainless steel tube 3 Erupted.
[0022]
Therefore, according to the apparatus of this embodiment, it is possible to continuously generate smoke and supply it to the wind tunnel experimental equipment, and to supply the stainless steel pipe 3 without supplying air pressure into the tank 2 by the compressor. Since the supply amount of fog juice 1 per unit time can be stabilized, the apparatus can be operated even when the compressor is not installed in the wind tunnel test equipment, and the air pressure is increased because the air pressure is not used. The possibility of tank breakage due to overpass can be completely eliminated.
[0023]
Further, according to the apparatus of this embodiment, the heating unit 4 is provided with the electrodes 7 and 8 at both end positions of the most part of the stainless steel tube 3, and the electrodes 7 and 8 are energized from the power supply unit 6. Since the stainless steel tube 3 between the electrodes 7 and 8 generates heat due to its own electrical resistance due to the direct current that flows, the fog juice 1 passing through the stainless steel tube 3 can be easily made with a simple configuration. And it can be heated safely.
[0024]
Although the present invention has been described based on the illustrated example, the present invention is not limited to the above-described example. For example, the heating unit is configured by separately providing a member such as a heating wire that generates heat by energization around the metal tube. It is also possible to supply the AC current to the power supply unit, and instead of ejecting smoke from the end of the metal tube, a smoke pipe is connected to the end of the smoke tube. The smoke may be supplied to a desired position in the wind tunnel experimental facility, and further, only a part of the oil supply pipe may be constituted by a flexible pipe instead of the entire length of the oil supply pipe. The number of rollers can be changed as appropriate in relation to the shape of the flexible tube holder, or by moving the rollers along the guide grooves, the shape of the movement path can be changed to an endless shape other than a circle (an oval or an ellipse). Shape).
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an embodiment of a smoke generator for wind tunnel experimental equipment according to the present invention.
FIGS. 2A and 2B are cross-sectional views showing an enlarged portion A and a portion B in FIG. 1, respectively.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fog juice 2 Tank 3 Stainless steel tube 4 Heating part 5 Tube made of flexible resin 6 Feeding part 7, 8 Electrode
17 Tubing pump
19 Laura
20 Tube holding block

Claims (2)

A tank (2) for storing fog juice (1), a metal tube (3) for generating smoke, a heating unit (4) for heating the fog juice passing through the inside of the metal tube, and the metal tube In a smoke generator for wind tunnel experimental equipment, comprising: an oil supply pipe (5) connecting one end of the tank and the tank; and a power supply unit (6) for supplying power to the heating unit to generate heat. ,
A tubing pump (17) having a plurality of rollers (19) driven by a power source to circulate and move on a predetermined movement path, and a flexible tube holder (20) shaped along at least a part of the predetermined movement path. And at least a part of the oil supply pipe is constituted by a flexible pipe,
A wind tunnel experimental facility characterized in that the flexible pipe of the oil supply pipe is held by the flexible pipe holding portion of the tubing pump and is handled without interruption by the plurality of rollers. Smoke generator. The heating part (4) is provided with electrodes (7, 8) at both end positions of at least a part of the metal tube (3), and the metal tube between the electrodes is supplied with electric current from the power supply part to the electrodes. The smoke generating device for wind tunnel experimental equipment according to claim 1, wherein said device generates heat by its own electric resistance.

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