JPS6344760Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an aerosol generating device used for sensitivity testing of smoke detectors.

Ionic and photoelectric smoke detectors are tested to see if their sensitivity is within a predetermined range when the product is completed. In other words, an aerosol is sent into a test box, and when the concentration is at a predetermined value, the sensor under test is placed into the box to confirm whether it operates within a predetermined time. Traditionally, smoke from incense sticks or filter paper was used as an aerosol, which resulted in poor particle stability and uniformity.
Another disadvantage is that the smoke contains smoke, which must be cleaned if it adheres to and accumulates on the inner surface of the box. Therefore, it is desirable from the viewpoint of environmental hygiene to use something other than smoke as the aerosol, and in recent years an aerosol generator as shown in FIG. 1 has been proposed.

To explain this with reference to Figure 1, 1 is a compressor, 2 is a filter, 3 is a pressure regulating valve, and 4 is a compressor.
are pressure gauges, which constitute a means for supplying pressurized air. Reference numeral 5 denotes an atomizer that generates an aerosol, and is comprised of a main body 6, a damper 7, and a liquid tank 8 containing a liquid to be aerosolized, such as paraffin. Further, 9 is a separator, 10 is a heater, and 11 is a condenser, which are connected to the above-mentioned sprayer 5.
A drain container 12 is connected between the separator 9 and the heater 10. The pressurized air supplied by the compressor 1 is purified by a filter 2, the pressure is further adjusted by a pressure regulating valve 3, and sent to the sprayer 5, where the main body 6 sucks the liquid in the liquid tank 8. Then, it is injected in the form of mist toward the damper 7 and turned into an aerosol. Note that the damper 7 receives particles sprayed from the main body 6,
It works to remove large particles. Then, the aerosol reaches the separator 9, and as it passes through this, the diameter of the passage changes repeatedly, so the flow of the aerosol is disturbed, and the large particles that were not removed by the damper 7 are affected by this, and the diameter of the passage changes repeatedly. It adheres to the inner surface and is removed. Then, by further passing through the heater 10, remaining large particles are removed, leaving only small particles.Finally, the aerosol is returned to room temperature in the condenser 11 and becomes a stable aerosol. and sent to the test box. Note that the aerosol with large particles removed by the separator 9 and the heater 10 is liquefied again and stored in the drain container 12.

According to the aerosol generator shown in Figure 1, the above-mentioned drawbacks can be eliminated because it does not generate smoke, but the following problems still remain in practical use. .
That is, while using this aerosol generator,
Changes in the concentration of the aerosol generated,
Problems include the particle size changing depending on the environment of the place of use, making it unstable, and the removal of large particles not being sufficient, and the above-mentioned aerosol not being able to circulate smoothly. It was hot.

By the way, as a result of investigating the above problems, we found that the cause of the change in the concentration of the generated aerosol is the change in the height of the liquid level in the liquid tank 8, and that the cause of the change in particle size is the change in the concentration of the aerosol generated. The reason why the viscosity of the liquid such as liquid changes due to changes in the environmental temperature, and the removal of large particles is not performed sufficiently is because the damper 7 of the sprayer 5 is fixed at a certain distance from the injection port. Furthermore, it has been found that the failure of the aerosol to flow smoothly is due to an insufficient supply of pressurized air.

Therefore, based on the above facts, the present invention is
The aerosol generating device shown in the figure is improved to solve the problems and become more practical. One embodiment of the device will be explained with reference to FIG. 2.
First, a compressor 1, a filter 2, a pressure control valve 3, and a pressure gauge 4 are connected in sequence to constitute a first pressurized air supply means, as in Fig. 1. Then, from this, it is divided into a plurality of systems, and a sprayer 5 is connected to each of them through an opening and closing valve 13, but unlike the case of Fig. 1, this sprayer 5 is equipped with a damper adjustment mechanism 14 for adjusting the facing distance between the damper 7 and the injection port of the main body 6 from the outside, and a liquid tank 8 is provided separately from the sprayer 5 and common to each system, and this liquid tank 8 is connected through an opening and closing valve 16 to a supply tank 15 for replenishing the liquid in the liquid tank when the liquid in the liquid tank is sucked by the flow of the pressurized air and the liquid level drops, and a heater 1 equipped with a temperature control device is connected to the supply tank 15.
The outlet side of the sprayer 5 is covered with a separator 9 for each system, and a heater 10.
The separator 9 is connected to the condenser 11 through the aerosol passage for each system.
and the heater 10.
2 is connected to each system, and a second pressurized air supply means consisting of a compressor 20, a filter 21, a pressure regulating valve 22 and a pressure gauge 23 arranged in the same manner as above 1 to 4 is connected to each system in common via a flow meter 18 and a check valve 19.

The present invention is constructed as described above. For example, paraffin is placed in the liquid tank 8, and by adjusting the opening degree of the on-off valve 16, when the height of the liquid level in the liquid tank 8 decreases, the above-mentioned Paraffin is replenished from the replenishment tank 15, and the liquid level is always kept constant. The paraffin in the liquid tank 8 is heated at a constant temperature by a heater 17 to keep its viscosity constant.

Therefore, as in the case of Fig. 1, the compressor 1 constituting the first pressurized air supply means passes through the filter 2, the pressure regulating valve pressure 3, and is separated into each system, which is then passed through the on-off valve 13. The pressurized air sent to the atomizer 5 sucks paraffin from the liquid tank 8 in the main body 6 of each system and injects it in the form of a mist toward the damper 7 to be aerosolized. In this case, as mentioned above, the liquid level and viscosity of the paraffin are always kept constant, so the concentration and particle size of the paraffin can be the same. Since it also contains particles larger than the damper 7.
It is removed by Then, in order to maximize the removal effect, the distance between the damper 7 and the injection port of the main body 6 is appropriately adjusted from the outside by the damper adjustment mechanism 14. The aerosol thus generated is sent to the separator 9, further to the heater 10, and finally to the test box through the condenser 11, as in the case of FIG.
Compressor 2 constituting the pressurized air supply means of
Pressurized air is also supplied from 0 through the filter 21, pressure regulating valve 22, check valve 19, and flow meter 18 to promote the circulation of the aerosol. The aerosol concentration can be adjusted by controlling the flow rate of the pressurized air supplied from the compressor 20 using the flow meter 18.

In this example, the system is divided into multiple systems, which may be used to supply aerosol to multiple test boxes at the same time, or to change the amount of aerosol supplied to the test boxes. In this case, the liquid tank 8 should be common to each system as shown in FIG.
In this way, even when multiple systems are used at the same time, the aerosol concentration and particle size of each system will be constant, and when only some systems are used, the capacity of the liquid tank 8 will be substantially reduced. It is advantageous because it becomes larger. In this case, if the flow meter 18 is provided for each system, the aerosol concentration can be changed for each system by adjusting the flow rate of pressurized air. However, if it is not necessary to simultaneously supply aerosol to a plurality of test boxes or to change the supply amount, only one system may be used. Also, the second
The pressurized air supply means may be common to the first pressurized air supply means, and the connection point thereof may be anywhere in the aerosol flow path, and is not limited to the embodiments. Furthermore, drain container 1
2 may also be provided at other locations in the flow path as appropriate.

As described above, in the present invention, the supply tank 1 is placed in the liquid tank 8.
5 is connected so that when the height of the liquid in the liquid tank 8 decreases, it is replenished from the replenishment tank 15 so that the height of the liquid is always kept constant. The liquid tank 8 is covered with a heater 17 equipped with a temperature control device, and the liquid is heated at a constant temperature to maintain a constant viscosity, so the aerosol generated by the sprayer 5 is A predetermined concentration and particle size can be obtained.
Also, among the aerosols, large particles are first removed by the tambour 7, but this damper 7 is equipped with a damper adjustment mechanism 14 that adjusts the facing distance from the injection port of the main body 6. By changing the facing distance, it can be externally adjusted to maximize the effect of removing large particles in the aerosol. Further, a second pressurized air supply means is connected to the aerosol flow path,
Pressurized air is also supplied from there, which promotes the flow of aerosol and directs it to the condenser 1.
If it is connected before the condenser 1, it will help the operation of the condenser 11.

Even when dividing into multiple systems as necessary, if the liquid tank 8 is shared by each system, the aerosol concentration and particle size of each system will be the same even when multiple systems are used at the same time. When only a part of the system is used, the capacity of the liquid tank 8 becomes substantially larger, which has an advantageous effect.

Therefore, according to the present invention, there is an excellent effect that the features of the aerosol generator as shown in FIG. 1 can be effectively exhibited.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a conventional aerosol generating device.
2 is a system diagram of one embodiment of the present invention. 1 ... compressor, 5 ... sprayer, 7 ... damper, 8 ... liquid tank, 9 ... separator, 10 ... heater, 11 ... condenser, 14 ... damper adjustment mechanism, 15 ... supply tank, 17 ... heater,
20...Compressor.

Claims (1)

[Claims for Utility Model Registration] 1. A liquid tank containing a liquid to be aerosolized, a pressurized air supply means, and a method for discharging the liquid from the liquid tank by circulating the pressurized air supplied from the supply means. a sprayer that generates an aerosol by sucking and spraying it in a mist form; a damper that receives the spray of the aerosol in the sprayer as a means for removing large particles from the aerosol generated by the sprayer; In an aerosol generator, a separator, a heater, etc. are provided in a flow path for the aerosol, and a condenser is further provided at the last stage of the flow path to return the aerosol to room temperature and condense it. The tank is equipped with a device for replenishing the tank with liquid when the liquid level in the tank is sucked by the flow of pressurized air in the atomizer and the height of the liquid level decreases, and a temperature control device. a liquid heating device; the sprayer further includes a damper adjustment mechanism for externally adjusting the facing distance between the spray nozzle and the damper; An aerosol generator characterized in that a separate pressurized air supply means is connected thereto. 2. A device that replenishes liquid to the liquid tank when the height of the liquid level in the liquid tank decreases is connected to the liquid tank and prevents the liquid from flowing into the tank due to the decrease in the height of the liquid level. The aerosol generating device according to claim 1, which is a replenishment tank for replenishment. 3. The aerosol generating device according to claim 1 or 2, wherein the liquid heating device including a temperature adjustment device is a heater that covers the liquid tank. 4. The aerosol generator according to any one of claims 1 to 3, wherein the pressurized air supply means connected to the aerosol flow path is connected via a flow meter. 5. The aerosol generating device according to any one of claims 1 to 4, wherein the atomizer and the aerosol flow path are divided into a plurality of systems. 6. The aerosol generating device according to claim 5, wherein a liquid tank is provided in common to each system. 7. The aerosol generating device according to claim 5 or 6 of the utility model registration, wherein a flow meter is provided for each system.