JPH028783B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic atomization device that atomizes a liquid by emitting ultrasonic waves into the liquid using an ultrasonic vibrator installed at the bottom of a container containing the liquid to be atomized. It is something.

Originally, in an ultrasonic atomizer, a column of liquid protruding from the liquid surface falls toward the liquid surface due to the weight of the liquid, which causes the liquid surface to shake and make the amount of atomization unstable. To counter this problem, the conventional methods have been to (a) float a shielding plate with through holes on the liquid surface, and (b) install a water droplet tray at the position where the liquid falls. The former (a) has the problem that the floating object also sways due to the fluctuation of the liquid level, and the latter (b)
Due to its structure, there are problems such as the inability to respond to changes in the liquid level up and down.

The present invention has been made to solve the above problems, and aims to increase the amount of atomization in an ultrasonic atomization device and to stabilize the amount of atomization.

The present invention will be explained below with reference to illustrated embodiments. FIG. 1 is a sectional view showing a first embodiment of the present invention, and FIG. 2 is a partial perspective view showing the embodiment of the honeycomb structure shown in FIG.

The liquid supply pipe 1 is hermetically connected to a hole in the lower side of the cylindrical container 6, and the air supply pipe 3 is hermetically connected to a hole in the upper side of the cylindrical container 6, so that they communicate with the inside of the cylindrical container 6. The container bottom 9 is sealed with the lower surface of the cylindrical melter 6, and an ultrasonic vibrator 2 integrated with a rubber sealing material is screwed into an opening hole 9a near the center of the melting container bottom 9 with the rubber sealing material sandwiched therebetween. ing. A spherical guide 5 is hermetically connected to the upper surface of the cylindrical container 6 so that the insides thereof communicate with each other. Further, inside the cylindrical container 6, a honeycomb structure 7 having a large number of small holes 7a is formed over the entire area of the ultrasonic transducer 2 except for the upper circular part 8.
The small hole 7a and the liquid supply pipe 1 communicate with each other and are fitted and fixed on the side surface of the cylindrical container 6 so as to project above the liquid surface A. To explain this honeycomb structure 7 in more detail, its outer periphery is circular and its overall shape is cylindrical, but it has a circular hollow part in a portion corresponding to the vibrator upper circular part 8. It is becoming. By providing a slight gap C between the bottom surface of the honeycomb structure 7 and the container bottom 9, all the small holes 7a and the liquid supply pipe 1 communicate with each other. Note that 7b is a partition wall that partitions the small hole 7a. Furthermore, the inside of the cylindrical container 6 surrounds a liquid column 10 erected by ultrasonic waves, and an air supply pipe 3
The guide 4 is hermetically joined to the honeycomb structure 7 so that the introduced gas can enter from between the guide 4 and the honeycomb structure 7.

The operation in the above configuration will be explained. The liquid introduced into the cylindrical container 6 from the liquid supply pipe 1 and kept at a constant level is atomized by energizing the ultrasonic vibrator 2 from a circuit not shown, and the atomized droplets are supplied. The gas introduced along the gas pipe 3 and the guide 4 passes through the spherical guide 5 and is led out. The liquid remaining from the liquid column 10 without becoming atomized particles falls into the numerous small holes 7a of the honeycomb structure 7 due to its own weight, but in this case, the liquid filled in the small holes 7a plays the role of a buffer, Upper circular part 8 of ultrasonic transducer 2
This makes it possible to prevent the liquid level from fluctuating. For this reason, the liquid column 10 becomes stable and becomes a uniform atomized flow, making it possible to increase the amount of atomization.

By using an aluminum honeycomb having small holes 7a as shown in FIG. 2 as the honeycomb structure 7, it is possible to increase the amount of atomization under all conditions. For example, according to the inventor's experiments, the honeycomb structure 7 has a height of 30 mm, an opening area of regular hexagonal small holes 7a of 23.4 mm ² , and a thickness of the partition walls 7b.
A 0.01 mm one was used, the liquid temperature was 21°C, the liquid level height from the center of the vibrator 2 was kept at 30 mm, and the upper end of the honeycomb structure 7 was made to protrude about 5 mm from the liquid level to change the gas flow rate. As a result of the experiment, the amount of atomization was lower when the honeycomb structure 7 was present than when it was not.
We were able to increase it by 20-25%.

FIG. 3 shows a second diagram regarding the shape of the honeycomb structure 7.
In this example, the shapes of the large number of small holes 7c of the honeycomb structure 7 and the partition walls 7d that partition the small holes 7c are square. The material of the partition wall 7d may be any material that is not corroded by the liquid introduced from the liquid supply pipe 1 and does not absorb ultrasonic waves, such as metal or ceramic. Further, the small hole 7c in FIG. 3 is formed in a square shape, and the small hole 7a in FIG. 2 is formed in a hexagonal shape, but the small hole shape is circular as shown in the third embodiment in FIG. Alternatively, it may be a polygon such as an octagon shown in the fourth embodiment of FIG. Figure 4,
In Figure 5, 7e and 7g are small holes, 7f and 7h
is a bulkhead. Furthermore, the honeycomb structure 7 referred to in the present invention is not limited to one that forms a honeycomb shape by itself, but also one that forms small holes by dividing the inside of the cylindrical container 6 with metal, ceramic, etc. It's okay.

In these second, third, and fourth embodiments, the upper and lower end surfaces of the small holes 7c, 7e, and 7g communicate with each other, and the lower end surfaces communicate with other small holes, so that the small holes 7c, 7e, and 7g form one small hole. Even if the liquid falls and shakes the liquid level, the liquid filled in that small hole acts as a buffer, and the liquid level in other small holes hardly moves. Therefore, the same effects as in the first embodiment can be expected.
In addition, in the first embodiment, the honeycomb structure 7 is fitted and fixed to the cylindrical container 6 on the side surface, but a projection is partially provided on the bottom surface of the honeycomb structure 7, and this projection is used to attach the honeycomb structure 7. By joining the honeycomb structure 7 to the container bottom 9, the large number of small holes 7a and the air supply pipe 1 may be communicated with each other. Further, in the first embodiment, the honeycomb structure 7 was installed in the entire area of the container bottom 9 except for the vibrator circular part 8, but the honeycomb structure was installed only in the part of the container bottom 9 where droplets are particularly likely to fall. 7 may be installed.

FIG. 6 is a sectional view showing an embodiment in which a honeycomb structure is used as a honeycomb heater in a combustor.

The liquid (liquid fuel such as kerosene) introduced into the cylindrical container 15 from the liquid supply pipe 1 is atomized by two ultrasonic vibrators 2 attached to the bottom part 9' of the container, and the atomized fuel droplets are , the air is introduced through two supply pipes 3, and a cylindrical outer flow guide 1
6 and the inner flow guide 17 into the container 15, the gas is led out to the upper part of the container 15. The upper end of the container 15 is hermetically joined to the joint case 19 so as to sandwich the seal member 18 and the upper end of the inner flow guide 17, and the upper end of the joint case 19 is connected to a plate 22 having a large number of small holes and a seal member 23. The burner head 20 is hermetically connected to the burner head 20 in such a manner that the burner head 20 is sandwiched therebetween. The atomized droplets led to the upper part of the container 15 are transferred to the joint case 19.
The flame passes through the interior of the burner head 20 and a large number of small holes in the plate 22, and is led out through a slit provided in the burner head 20 to form a flame. 21 is a heat recovery plate made of metal such as aluminum or stainless steel that recovers the heat of the flame, and 11 is a partition plate that divides the inside of the container 15 into two. Inside the container 15, two honeycomb structures 70 have their upper end surfaces protruding between the lower end of the guide 17 and the liquid level A in a portion of the ultrasonic transducer 2 excluding the upper circular portion 8, and ' and honeycomb structure 70
The partial protrusions at the lower ends of the protrusions are bonded and fixed to each other with adhesive, with a gap sufficient to allow communication between the small holes 70a (FIG. 7). A temperature sensor 13 is provided below the liquid level on the side wall of the container 15 via a seal member 12, and a lead wire 25 of an electric heater 26 (FIG. 7) of a honeycomb structure 70 is taken out via a seal member 24. . And temperature sensor 13
The detection signal is input to the temperature controller 14, and the liquid temperature is maintained at a constant value by intermittent power supply to the electric heater 26 of the honeycomb structure 70 in accordance with this detection signal. The specific structure of the honeycomb structure 70 is, as shown in FIG. 7, in which an electric heater 26 is surrounded by a filler 27, and is further integrally molded with a ceramic 70b having a large number of small holes 70a.
This is done to prevent the heater 26 from coming into direct contact with the fuel, but the fuel may be directly heated as long as the surface of the heater 26 does not reach a temperature above the flash point. By raising the liquid temperature and keeping it constant in this manner, there is an advantage that the amount of atomization can be further increased in addition to the liquid level stabilizing effect provided by the honeycomb structure 70. In addition, since the atomized flow is used as a mixed gas for combustion,
The uniformity of the atomization flow by the honeycomb structure 70 forms a stable flame, and the increase in the amount of atomization brings about the effect of enabling strong combustion with low electric power.

The present invention can be applied not only to liquid fuel combustion apparatuses such as the embodiment shown in FIG. 6, but also to air conditioning humidifiers and the like.

As detailed above, according to the present invention, by installing the honeycomb structure, the liquid level above the ultrasonic transducer can be stabilized, and the amount of atomization can be increased and the amount of atomization can be stabilized. This has an excellent effect.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the device of the present invention, FIGS. 2 to 5 are perspective views showing a specific example of the honeycomb structure 7 shown in FIG. 1, and FIG. Another embodiment is a longitudinal sectional view, and FIG. 7 is a partial perspective view showing the specific structure of the honeycomb structure 70 shown in FIG. 6. 1...Liquid supply pipe, 2...Ultrasonic vibrator, 3...
...Air supply pipe, 6,15...Container, 9,9'...
Container bottom, 7, 70...honeycomb structure.

Claims (1)

[Claims] 1. In an ultrasonic atomization device that atomizes a liquid by emitting ultrasonic waves into the liquid by an ultrasonic vibrator installed at the bottom of a container containing a liquid to be atomized, an ultrasonic vibration A honeycomb structure having a large number of small holes in a part or the entire area of the bottom of the container, excluding the upper part of the container, is installed so that its upper end surface protrudes above the liquid surface and the liquid supply port communicates with the entire liquid surface. Ultrasonic atomization device. 2. The ultrasonic atomization device according to claim 1, wherein the honeycomb structure houses a heating element in a state that does not contact the liquid.