JPS6024459Y2 - ultrasonic humidifier - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an ultrasonic humidifier equipped with an ultrasonic vibrator for atomization.

Conventionally, ultrasonic humidifiers have an ultrasonic vibrator installed at the bottom of a water tank, and the ultrasonic vibrator is supplied with oscillation output from a high-frequency oscillation circuit to generate ultrasonic waves. Ultrasonic waves are applied to the water inside the water tank to form a water column in the irradiated area, and a minute water mist is generated from the water column, and this mist water is blown out to the outside of the aquarium along with the wind from the blower. It is configured to humidify the room.

However, this type of ultrasonic humidifier uses ultrasonic irradiation to form a water column against the surface tension of the water in the aquarium and generate water mist, so the viscosity coefficient of the water in the aquarium is The amount of mist water generated by the ultrasonic vibrator changes depending on the size.

Further, the viscosity coefficient of water changes in size in proportion to the temperature of the water.

Therefore, in conventional systems where the oscillation output supplied from the high-frequency oscillation circuit to the ultrasonic transducer is constant, when the water in the tank is replenished at the start of operation or during operation, the When the temperature of the water is low, and when the temperature of the water in the aquarium rises due to the internal heat loss of the ultrasonic transducer being released into the water as the operating time elapses, There was a problem that the amount generated was different, and the humidification effect on the room changed over time.

The present invention was developed in view of the above circumstances, and its purpose is to supply a bias voltage to the oscillation transistor of a high-frequency oscillation circuit using a temperature-sensitive resistance element installed to sense the temperature of water in an aquarium. When the temperature of the water in the aquarium changes by connecting it to an electric circuit and controlling the collector current of the oscillating transistor to decrease or increase as the temperature of the water increases or decreases. However, it is an object of the present invention to provide an ultrasonic humidifier that can keep the humidifying effect on a room substantially constant without changing the amount of mist water generated by an ultrasonic vibrator.

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

First, the general structure will be described according to FIG. 1. Reference numeral 1 is a water tank with an open top surface disposed inside an outer box (not shown). A cover plate 2 is attached, and a spout 3 is formed at the upper left side, and an air outlet 4 is formed at the right side.

Reference numeral 5 denotes a support having an opening 5a in the center and a flange 5b on the outer periphery of the lower part, which is fitted into a mounting opening 6 formed at the bottom of the water tank 1 so as to correspond to the spout 3;
The flange portion 5b is attached to the bottom of the water tank 1 via the backing 7 by screwing or the like.

Then, an ultrasonic transducer 8 is disposed at the bottom of the support 5 via a sealing member 9 so as to close the opening 5a, and the ultrasonic transducer 8 is fixed to the bottom of the support 5 by screws, etc. It is held by a holder 10 attached by.

11 is a negative characteristic thermistor as a temperature-sensitive resistance element;
For example, this is attached in close contact with the outer surface of the bottom of the aquarium 1, so that the temperature of the water in the aquarium 1 can be sensed.

Reference numeral 12 denotes a blower, which includes a blower blade 13 facing the blower opening 4 and a drive motor 14 for rotationally driving the blower blade 13.

Now, the configuration of the electric circuit will be described according to FIG.

Reference numeral 15 denotes a DC power supply constituted by a full-wave rectifier circuit using a rectifier diode 16, one of which is an AC input terminal 15a.
Connect one terminal of the plug 18 to the AC input terminal 15b via the power switch 17, and connect the plug 1 to the other AC input terminal 15b.
The drive motor 14 described above is connected between the input terminals 15a and 15b of the DC power supply 15.
Connect both input terminals.

A first DC output terminal 19 and a second DC output terminal 20 are provided at portions corresponding to the positive and negative poles of the DC power supply 15, respectively.
A capacitor 21 is connected between these DC output terminals 19 and 20, and a series circuit of a smoothing capacitor 22 and a protective resistor 23 is connected.

One DC power supply line 2 is connected to the first DC output terminal 19.
4 is connected to the second DC output terminal 20, and the other DC power supply line 26 is connected to the second DC output terminal 20 via a choke coil 25 that blocks high frequencies and passes DC current.

27 is a common collector type LC as a high frequency oscillation circuit.
In the oscillation circuit, by directly connecting the collector of the oscillation transistor 28 using a power transistor as an amplification element to one of the DC power supply lines 24, that is, the first DC output terminal 19, the DC power supply 15 and the oscillation transistor can be connected. 28
It has a so-called collector common configuration in which the collectors of the
9 to the other DC power supply line 26.

A first oscillation capacitor 30 is connected between the DC power lines 24 and 26.

Reference numeral 31 denotes a high-frequency output capacitor having a primary winding 32a and a secondary winding 32b.A series circuit of the primary winding 32a and a feedback amount limiting capacitor 33 is connected between the collector and base of the oscillation transistor 28, and a secondary The aforementioned ultrasonic transducer 8 is connected between both ends of the winding 32b.

Further, a second oscillation capacitor 34 is connected between the common connection point of the primary winding 32 a and the feedback amount limiting capacitor 33 and the DC power supply line 26 .

35 is a resistance type potentiometer, 36 and 37 are bias resistors, and both ends of the potentiometer 35 for setting the humidification amount are connected between the base of the oscillation transistor 28 and the DC power supply line 26. Resistor 3
The series circuits 6 and 37 are connected between the DC power supply line 24 and the slider 35a of the potentiometer 35, and the potentiometer 35 and bias resistors 36 and 37 are used to supply a bias voltage to the oscillation transistor 28. Configure.

Then, the negative characteristic thermistor 11 is connected between the common connection point of the bias resistors 36 and 37 and the DC power supply line 26, that is, in the electric path that supplies the bias voltage to the oscillation transistor 28 described above.

Next, the operation of this embodiment having the above configuration will be explained.

Now, when the water 38 is supplied to the specified water level in the aquarium 1, the plug 18 is inserted into a single-phase AC power outlet (not shown), and the power switch 17 is then closed, the drive motor 14 is energized. At the same time, a single-phase AC power is applied between the AC input terminals 15a and 15b of the DC power supply 15, and a smoothing capacitor 22 is connected between the first and second DC output terminals 19 and 20 of the DC power supply 15. A smoothed DC output is obtained, and the DC output is supplied to the oscillation circuit 27 via the choke coil 25 and the DC power lines 24 and 26.

Thus, the oscillation transistor 28 is connected to the bias resistor 36.
and 37, a bias voltage is supplied from an electric circuit consisting of a potentiometer 35 and a negative characteristic thermistor 11 to start oscillation.

At this time, positive feedback is applied to the base of the oscillation transistor 28 via the feedback amount limiting capacitor 33 and the coil component that contributes to the oscillation of the high frequency transformer 31, and the oscillation transistor 28 operates as an amplification element for the feedback current.

In this case, since the operation has just started, the temperature of the water 38 in the water tank 1 is low, and the negative characteristic thermistor 11 senses the temperature of the water 38 and exhibits low temperature and high resistance. The potential at point A is relatively high, and accordingly, the potential at point B in FIG. It becomes flowing.

Therefore, the LC oscillation circuit 27 generates a relatively large oscillation output and supplies it to the ultrasonic vibrator 8, and the ultrasonic vibrator 8 vibrates to generate ultrasonic waves with relatively high energy density and force. Then, the water 38 is irradiated with this ultrasonic wave through the opening 5a of the support 5.

As a result, even though the water 38 in the water tank 1 is low temperature and has a large viscosity coefficient, the part of the water irradiated with the ultrasonic wave swells up high as shown in Figure 1 and turns into a water column 39, and at the same time, this water column Generate a sufficient amount of fine water mist around 39.

On the other hand, when the blower blade 13 is rotationally driven by the drive motor 14, it sucks air from outside the outer box and blows the air into the aquarium 1 from the air outlet 4 as shown by the arrow 40, so that the air is directed above the aquarium 1. The mist water generated in the process is spouted out from the spout 3 to the outside, humidifying the room.

Then, as the operating time passes, thermal energy such as internal heat loss of the ultrasonic vibrator 8 is given to the water 38, the temperature of the water 38 gradually increases, and its viscosity coefficient gradually decreases.

Therefore, the negative characteristic thermistor 11 senses the temperature of the water 38 and exhibits a high temperature and low resistance.
The potential at point A in the figure decreases, the potential at point B in FIG. 2, that is, the bias voltage of the oscillation transistor 28 decreases, and the collector current of the oscillation transistor 28 decreases.

As a result, the oscillation output of the LC oscillation circuit 27 decreases, but as described above, the viscosity coefficient of the water 38 is small, so as a result, the amount of mist water generated by the ultrasonic vibrator 8 hardly changes.

If the water 38 in the tank 1 drops below a predetermined water level during operation, new water is supplied to the tank 1, but the temperature of the water 38 in the tank 1 decreases accordingly. water 3
Even when the viscosity coefficient is 8, a relatively large oscillation output is supplied to the ultrasonic transducer 8 by the same operation as described above, and the amount of mist water generated hardly changes.

As described above, according to this embodiment, the negative characteristic thermistor 11, which is provided so as to be able to sense the temperature of the water 38 in the water tank 1, is connected to the electric circuit that supplies the bias voltage to the oscillation transistor 28. When the temperature of the water 38 is low, the collector current of the oscillation transistor 28 is increased, and when the temperature of the water 38 is high, the collector current is decreased.

Therefore, even when the temperature of the water 38 in the water tank 1 is low and its viscosity coefficient is high, such as when water is replenished into the water tank 1 at the start of operation or during operation, or when the operation time has elapsed. Even if the temperature of the water 38 rises and its viscosity coefficient decreases, the amount of mist water generated by the ultrasonic vibrator 8 can be kept approximately constant, and the humidifying effect on the room can be maintained as in the conventional case. There is no such thing as changing in time.

In the above embodiment, the negative characteristic thermistor 11 is used as the temperature-sensitive resistance element, but a positive characteristic thermistor may be used instead. In this case, the positive characteristic thermistor is used as the bias resistor 36 and 37 By connecting between the two terminals, the collector current of the oscillation transistor 28 can be controlled in the same manner as in the above embodiment.

Further, in the above embodiment, the negative characteristic thermistor 11 is attached to the outer surface of the bottom of the water tank 1 to sense the temperature of the water 38 in the water tank 1. Of course, it is also possible to directly sense it.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with appropriate modifications within the scope of the invention.

As explained above, in this invention, even when the temperature of the water in the water tank changes, the amount of mist water generated by the ultrasonic vibrator hardly changes, and the humidifying effect on the room is always kept almost constant. It is possible to provide an ultrasonic humidifier that has the practical effect of being able to.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with FIG. 1 being a schematic vertical sectional view and FIG. 2 being an electrical circuit diagram. In the figure, 1 is a water tank, 8 is an ultrasonic transducer, 11 is a negative characteristic thermistor (temperature-sensitive resistance element), 27 is an oscillation circuit (high frequency oscillation circuit), 28 is an oscillation transistor, 31 is a high frequency output transducer, 33 35 is a feedback amount limiting capacitor, 35 is a potentiometer, 36 and 37 are bias resistors, and 38 is water.

Claims (1)

[Scope of utility model registration request] A water tank is equipped with an ultrasonic vibrator for atomization, and a high-frequency oscillation circuit that uses an oscillation transistor as an amplifying element for feedback current and drives the ultrasonic vibrator, wherein the temperature of the water in the water tank is A temperature-sensitive resistance element provided to sense the oscillation transistor is connected to an electric circuit that supplies a bias voltage to the oscillation transistor, and the collector current of the oscillation transistor is decreased as the temperature of the water increases or decreases. An ultrasonic humidifier characterized in that the ultrasonic humidifier is controlled in the direction of increasing the humidifier.