JPH0966248A - Ultrasonic atomizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the atomizing state, prevent the effect of different fluid qualities and prevent the fluid sagging by reducing the pressure inside a storage tank by a pressure reducing section, keeping the constant pressure therein through a vent and making the storage tank communicate with an atomizing block only at the time of operation. SOLUTION: Atomizing fluid is filled in a storage tank 12, and then the pressure inside the storage tank 12 is reduced while a volume varying section 43 of a pressure reducing mechanism 40 is set in the stretched state. At that time, a solenoid 30 is in the sinking state, and a fluid outflow opening 12c is blocked by a valve 32, and air is infiltrated into the tank 12 through a vent 34 to set the inside of the tank 12 at the constant level of pressure, prevent the fluid sagging and stabilize the atomizing amount. When a human hand is stretched out into an atomizing area, a fluid inflow opening 13c is blocked by a sensor 13d, and atomizing fluid 20 is flowed into an atomizing chamber 13b of an atomizing block 13, and atomized through micropores of a filter 137 fitted at the end of an ultrasonic transducer 13c to be used for the disinfection of the hand.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic spraying device, which is used as, for example, a sterilizer and the like, and which uses an ultrasonic transducer that atomizes spray liquid in a container by applying ultrasonic energy.

[0002]

2. Description of the Related Art Conventionally, disinfection of hands and the like has been performed by putting a disinfectant solution such as alcohol and a cresol solution in a washbasin, and putting the hand in the washbasin to wash it. In addition, recently, a method of disinfecting a hand by using a disinfectant solution as a shower using a device has been adopted. Means for discharging the disinfectant liquid in a shower form is roughly classified into a mechanical type using a pump and an ultrasonic type applying the principle of an ultrasonic humidifier.

However, in disinfection by putting a hand into the disinfectant solution in the washbasin, the same disinfectant solution is repeatedly used, so that contamination of the disinfectant solution and reduction in sterilizing power are unavoidable. It can also cause infection.

Further, in the mechanical disinfecting device, pumping up is required, noise is generated when the pump is driven, and the surface area of the disinfectant solution pressurized by the pump is small, resulting in insufficient wettability of the fingers. Also, in the ultrasonic type disinfecting device, similarly, it is necessary to pump up the disinfecting liquid from the filling tank and send the liquid to the ultrasonic vibrator, which makes the structure complicated.

Therefore, the applicant has proposed an ultrasonic spraying device which does not repeatedly use the spraying liquid, has a simple structure, and has almost no residual spraying liquid in the tank (actually, in Japanese Utility Model Publication No.
-7767).

FIG. 16 is a vertical sectional view showing the structure of this ultrasonic spraying device. As shown in FIG. 16, this ultrasonic spraying device has a storage tank 1 filled with a spraying (disinfecting) liquid 2.
And the spray liquid 2 attached to the bottom 1a of the storage tank 1.
A spray block 3 having a built-in ultrasonic transducer 3a for spraying, a sensor 4 provided near the spray block 3 for detecting the approach of a human body, and a drive for driving the ultrasonic transducer 3a for a predetermined time by inputting a detection signal of the sensor 4. And a circuit 5 are provided.

In such a structure, the spray block 3
When a part of the human body, for example, a hand is extended to the lower region of the, the sensor 4 senses it. Then, the drive circuit 5 starts oscillating, and the voltage element of the ultrasonic transducer 3a connected thereto is driven. As a result, the spray liquid 2
Are drawn into the ultrasonic transducer 3a. The spray liquid 2 drawn into the ultrasonic transducer 3a is
It is atomized by the fine pores of the filter at the tip of the ultrasonic transducer 3a and used for hand disinfection.

[0008]

However, in the above-mentioned ultrasonic spraying device, the condition of aeration changes due to the difference in liquid quality, and since the inside of the tank becomes atmospheric pressure when the liquid is injected, it is not atomized. In addition, there is a problem that a so-called dripping phenomenon occurs, in which the liquid remains flowing out from the tip portion of the ultrasonic transducer 3a.

The present invention has been made in view of such circumstances, and an object thereof is to stabilize the atomized state, prevent the influence of the difference in liquid quality, and prevent the occurrence of dripping. It is to provide a practical ultrasonic spraying device.

[0010]

In order to achieve the above object, the present invention provides a spray tank having a spray liquid filled therein, and an ultrasonic transducer attached to the bottom of the storage tank for spraying the spray liquid. An ultrasonic spraying device having a block, wherein the storage tank is depressurized to a constant pressure while the storage tank is filled with a spray liquid and a ventilation hole extending from the upper part to the lower part of the storage tank. It has a depressurizing section for controlling and a liquid outflow adjusting section for communicating the storage tank with the spray block only during operation so as to flow the spray liquid into the spray block.

Further, the present invention is an ultrasonic spraying device having a storage tank filled with spray liquid, and a spray block which is attached to the bottom of the storage tank and has an ultrasonic transducer for spraying the spray liquid. The storage tank has a vent hole extending from the upper part to the bottom part, and an opening / closing means for holding the vent hole in an open state during operation and in a closed state during non-operation.

The present invention is also an ultrasonic spraying device having a spraying block which is attached to the bottom of the first storage tank and has an ultrasonic transducer for spraying a spraying liquid. The ultrasonic spraying device is parallel to the first storage tank. And a communication pipe that connects the inside of the first storage tank with the inside of the second storage tank, and extends from an upper portion to a lower portion of the second storage tank. A liquid outflow for communicating the first storage tank with the spray block and causing the spray liquid to flow out into the spray block only during operation, with the existing vent hole, the decompression unit for reducing the pressure in the first storage tank to a constant pressure. And an adjusting unit.

Further, the ultrasonic spraying device of the present invention has means for applying a pressure to the spraying block at least when the ultrasonic spraying device is not operated to discharge the spraying liquid remaining in the liquid spraying end region of the ultrasonic transducer.

According to the ultrasonic spraying device of the present invention, the inside of the storage tank is depressurized by the depressurizing unit, so that it is maintained at a constant pressure through the ventilation hole. As a result, stable atomization operation is performed. Further, the air hole is held in the open state when operating and is kept in the closed state when not operating. As a result, the internal pressure in the container is adjusted and dripping is prevented. Furthermore, the first
Since the inside of the storage tank is decompressed and the inside of the second storage tank is maintained at a constant pressure through the ventilation hole, the spray liquid filled in the second storage tank is sent to the first storage tank through the communication pipe. Then, the spray liquid stored in the first storage tank flows out to the arrangement portion of the ultrasonic transducer provided in the spray block during operation, and the spray liquid is sprayed.

Further, for example, when not operating, pressure is applied in the spray block, and the spray liquid remaining in the liquid spray end region of the ultrasonic transducer is discharged to the outside of the block. As a result, when power is cut off during use or when the power is turned off, dripping may occur without atomization, but normal atomization operation should be performed without dripping during subsequent use. You can

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION First Embodiment FIG. 1 is a sectional view showing a first embodiment of an ultrasonic spraying device according to the present invention, and FIG. 2 is a plan view. As shown in FIG. 1, the ultrasonic spraying device 10 includes a storage tank 1 in which an upper part of a main body case 11 is filled with a spraying liquid, for example, a disinfecting liquid 20.
2 is arranged, the spray block 13 is arranged at the bottom of the storage tank 12, the human hand or the like is inserted from the opening 14a into the lower part of the spray block 13 which is the lower half of the case 11, and the disinfectant solution 20 is supplied. A spray region 14 for spraying is formed, and a waste liquid tray 15 for collecting used disinfectant liquid is detachably (drawer type) provided below the spray region 14.

On one side of the upper part of the storage tank 12, a filling port 12a of the disinfectant solution 20 protruding from the upper surface 11a of the case 11 is provided.
Is formed, and the filling port 12a has a cap 12b for closing the filling port 12a. In addition, the upper surface 11 of the main body case 11
A solenoid 30 which is driven and controlled by a drive circuit mounted on the circuit board BS is provided at a substantially central portion of a.
A valve shaft 31 driven by a solenoid 30 penetrates the storage tank 12 from the upper surface side, and further passes through a liquid outlet 12c formed at the bottom of the storage tank 12, and the solenoid 30 is projected and retracted at the tip of the valve shaft 31. A valve 32 that opens and closes the liquid outlet 12c according to control is attached. Further, an elastic member 33 for urging the solenoid upward in the drawing is provided on the bottom surface side of the storage tank 12.

Further, a part of the bottom of the storage tank 12 is formed with a concave portion 12d reaching the vicinity of the lower region of the spray block 13, and the concave portion 12d is formed from the upper surface 11a to the concave portion 1d.
A tube-shaped vent hole 34 extending to the vicinity of the bottom of 2d is formed. A ventilation filter 35 is provided on the upper surface 11a side of the ventilation hole 34, and the filter 35 has a filter pressing plate 36 in which an air hole 36a communicating with the ventilation hole 34 is formed.
Is fixed by using an O-ring OR.

By adjusting the length of the tube-shaped vent hole 34, the pressure in the storage tank 12 can be easily adjusted and dripping can be prevented. Further, the pressure adjustment due to the difference in the liquid chamber can be easily performed.

Further, on the upper surface side of the storage tank 12, there is provided a decompression mechanism 40 for decompressing the inside of the storage tank 12 when the filling port 12a is closed by the cap 12b.

FIG. 3 is a diagram showing a structural example of the pressure reducing mechanism 40. As shown in FIG. 3, the decompression mechanism 40 has a substantially V-shaped decompression lever 4 whose one end is suspended from the filling port 12a.
1, a lever support portion 42 that supports the substantially central portion of the decompression lever 41, and a bellows-like elastic body that closes an opening 12e formed in communication with the upper surface of the storage tank 12 and the upper surface 11a of the case 11. The volume changing portion 43, a supporting portion 44 provided on the upper portion of the volume changing portion 43, to which the other end of the pressure reducing lever 41 is attached, the pressure reducing lever 41 between the lever supporting portion 42 and the supporting portion 44, and a case. The upper surface 11
It is composed of a spring 45 suspended between a and a.

In this pressure reducing mechanism 40, as shown in FIG. 3A, when the cap 12b is removed from the filling port 12a, no downward force is applied to one end of the pressure reducing lever 41. Therefore, the pressure reducing lever 41 is positioned above and the other end of the pressure reducing lever 41 is positioned below. As a result, the volume changing unit 43 is in a contracted state, and the volume of the storage tank 12 only slightly increases. On the other hand, after filling the storage tank 12 with the spray liquid (disinfectant liquid) 20, the cap 12b
When the pressure reducing lever 41 is attached, as shown in FIG. 3B, a downward force is applied to one end of the pressure reducing lever 41 so that the pressure reducing lever 41 is positioned below, and the other end of the pressure reducing lever 41 has a lever supporting portion 42.
Around the center, it makes a rotational movement and is pulled upward.
As a result, the volume changing unit 43 changes from the contracted state to the extended state, and the volume of the storage tank 12 increases. for that reason,
The pressure in the storage tank 12 drops.

FIG. 4 is a diagram showing another example of the pressure reducing mechanism. The decompression mechanism 40a is configured by a piston type instead of the volume changing portion 43a by a bellows-like elastic body, and other configurations and functions are similar to those of FIG.

The depressurizing mechanism is not limited to the mechanical type described above, but may be an electric type using a motor, a worm and a worm wheel, and various modes are possible.

The spray block 13 is attached to the bottom of the storage tank 12 with a fixing screw 13a via rubber packing or the like. A spray chamber 13b communicating with the liquid outlet 12c of the storage tank 12 is formed in the central portion, and the spray port is provided in the spray chamber 13b.
The ultrasonic transducer 13c is arranged so as to face the above.

FIG. 5 is a longitudinal sectional view showing the ultrasonic transducer 13c in a disassembled state. The ultrasonic transducer 13c, as shown in FIG.
31 and the second transducer 132 are screwed to each other, and passages 131a and 132a for sucking the spray liquid are formed in the respective axial central portions. Also,
First transducer 131 and second transducer 1
32 between the piezoelectric element 133 and the ceramic vibrator 1
34, the + side terminal 135, and the-side terminal 136 are arranged in a superimposed manner in the illustrated state, and a DC power source (not shown) is connected to the terminals 135 and 13.
6 is connected. Further, the second transducer 132
A filter 137 having a large number of fine holes of 5 μm to 10 μm formed therein and a cap 138 for holding the filter 137 are provided at the end portion 132b of the.

Further, the lower portion of the spray block 13 is formed in a taper shape so as to widen toward the end, and a sensor 13d for detecting the approach of a human body is provided in a part thereof. Sensor 13
The sensing signal of d is output to the timer system drive circuit mounted on the circuit board BS. When receiving the sensing signal, this drive circuit drives the solenoid 30 and drives the ultrasonic transducer 13c for a predetermined time, for example, 5 to 6 seconds, and then automatically stops the drive.

Next, the operation of the above configuration will be described. First, in the initial state, after the spray liquid 20 is filled in the storage tank 12, the cap 12b is attached and the volume changing unit 43 of the decompression mechanism 40 is in an expanded state, so that the volume of the storage tank 12 increases. However, the pressure in the storage tank 12 has dropped. At this time, the solenoid 30 is controlled to be in a retracted state, and the liquid outlet 12c formed at the bottom of the storage tank 12 is closed by the valve 32. Then, the air is stored in the storage tank 12 through the ventilation holes 34.
Since it enters inside, the inside of the tank has a constant pressure, the generation of dripping is suppressed, and the amount of spray is also constant, and atomization is stable.

In this state, when a part of the human body, for example, a hand is extended to the spray area 14 below the spray block 13, the sensor 13d senses it. The detection signal of the sensor 13d is output to the timer drive circuit mounted on the circuit board BS. Then, the solenoid 30 is driven by the drive circuit.
Is driven to an output state, the liquid inlet 13c is held in an open state, the spray liquid 20 flows into the spray chamber 13b of the spray block 13, and the ultrasonic transducer 1
3c is driven for a predetermined time. As a result, the voltage element of the ultrasonic transducer 13c is driven. As a result, the spray liquid (disinfectant liquid) 20 is transferred to the ultrasonic transducer 1.
It is drawn into 3c. Ultrasonic transducer 13c
The spray liquid 20 drawn in is atomized by the fine holes of the filter 137 at the tip of the ultrasonic transducer 13c and is used for hand disinfection.

After a lapse of a predetermined time, the driving of the ultrasonic transducer 13c is stopped and the solenoid 30 is driven so as to be in a retracted state. As a result, the spraying of the spray liquid 20 is stopped, the liquid outlet 12c is closed, and the flow of the spray liquid 20 from the storage tank 12 into the spray chamber 13b is suppressed.

As described above, according to the first embodiment, the spray liquid 20 does not remain in the storage tank 12, and the structure is simple. Spraying of the spray liquid 20 can be started and stopped, and the spraying range is wide and the wettability to the fingers is good, and the atomization state can be stabilized, and moreover, due to the difference in liquid quality. There is an advantage that it is possible to realize a practical ultrasonic spraying device capable of preventing the influence and preventing the occurrence of dripping.

As a valve mechanism of the liquid outlet 12c,
It is not limited to that of FIG. For example, FIG.
As shown in FIG.
It may be provided on the bottom side of the storage tank 12, and as shown in FIG. 7, the liquid outlet 12c is formed in a half-moon shape in cross section,
This may be opened and closed by the rotary valve 12f.

Further, in FIG. 1, the valve shaft 31 is retracted and retracted by a solenoid, and the liquid outlet 12c is controlled by the valve 32.
However, as shown in FIG. 8, for example, as shown in FIG. 8, the valve shaft 31a is moved up and down via a worm wheel 38 which is rotationally driven by a motor 37, so that the liquid outlet 1
2c may be configured to be opened and closed, and various modes are possible.

Furthermore, as shown in FIG. 9, an opening 13e is formed in the side wall of the spray chamber 13b of the spray block 13, and a volume changing portion 13f made of a bellows-like elastic body for closing the opening 13e, Providing a return modern 13g that is provided on the side wall of the main body case 11 and is biased by a spring that expands and contracts the volume changing portion 13f is effective in preventing dripping. That is, when power is cut off during use or power is turned off, dripping may occur without being atomized.
In this case, as shown in FIG. 9B, the return button 13g
By pushing in, the pressure in the spray chamber 13c is increased and the liquid adhering to the tip is discharged to the outside of the spray chamber 13b.
As a result, a normal atomization operation can be performed thereafter without dripping.

The volume changing portion is formed of a piston type instead of the bellows-like elastic body.
Various embodiments are possible. Further, it goes without saying that such a return button system can also be adopted in the pressure reducing mechanism shown in FIGS. 3 and 4.

Second Embodiment FIGS. 10 and 11 are sectional views showing a second embodiment of the ultrasonic atomizing device according to the present invention, FIG. 10 showing a non-operating state, and FIG. 11 showing an operating state. Is shown.

In the second embodiment, the valve 50 having a substantially T-shape for opening and closing the air hole 36a of the filter pressing plate 36 is provided on the end face of the vent hole 34 with the vent hole 34 further projected to the upper surface side. The valve 50 is provided and the rear end of the valve 50 is fixed to one end of the valve lever 51. Further, the activation switch 70 provided in the moving range of the lever 60 is turned on by pushing the lever 60 provided at the back side of the spray region 14 by inserting the hand without depending on the non-contact sensor detection. The valve 50 is opened via a link lever 62 that is interlocked with the lever 60 and is urged to the left side in the drawing by a spring 61, and is connected to the valve lever 51 to keep the inside of the storage tank 12 at a constant pressure. When the hand is extracted from the spray area 14, the switch 70 is turned off, the link lever 62 is returned to the left position in the drawing, and the valve 50 causes the air hole 36a.
Is configured to close.

Therefore, in this spraying device 10a, the bottom of the storage tank 12c and the spraying chamber of the spraying block 13 are formed in communication with each other, and a valve mechanism for opening and closing them is provided as shown in FIG. Absent. However, although not shown, the decompression mechanism shown in FIG. 3 or 4 is provided above the storage tank 12.

Also in the second embodiment, the same effect as in the above-described first embodiment can be obtained.

In the case of the automatic spraying control accompanied by the detection of the non-contact sensor as in the first embodiment, the valve 50 is mechanically interlocked with the valve 50 as shown in FIGS.
Instead of opening and closing, for example, as shown in FIG.
It can be configured to open and close by the solenoid 52.

In this configuration, when the start switch 70 is turned on, the ON signal is output to the timer system drive circuit mounted on the circuit board BS to drive the ultrasonic transducer 13c and start switch 70.
Is stopped when is turned off.

Third Embodiment FIGS. 13 and 14 are sectional views showing a third embodiment of the ultrasonic spraying device according to the present invention, FIG. 13 showing a non-operating state, and FIG. 14 showing an operating state. Is shown.

The difference of the third embodiment from the above-described second embodiment is that the valve 50 is arranged at the bottom of the recess 12g provided in the storage tank 12.

The other structure is the same as that of the above-described second embodiment, and similar to the second embodiment, the same effect as that of the first embodiment can be obtained.

Fourth Embodiment FIG. 15 is a sectional view showing a fourth embodiment of the ultrasonic spraying device according to the present invention. The difference of the fourth embodiment from the above-described first embodiment is that a second storage tank 16 is provided in parallel with the storage tank 12, and the storage tank 12 and the second storage tank 16 are connected by a communication pipe 17. And the filling port 16a for the spray liquid 20 is provided in the upper portion of the second storage tank 16, and the ventilation hole 34, the ventilation filter 35, and the holding plate 36 are provided in the second storage tank 16. The depressurization mechanism 40 that operates in conjunction with the attachment of the cap 16b is the same as in FIG.

When the inside of the storage tank 12 is depressurized by mounting the cap 16b, and the spray liquid 20 filled in the second storage tank 16 is pushed up through the communication pipe 17 and delivered to the storage tank 12. At the same time, since air enters the storage tank 16 through the ventilation hole 34, the pressure inside the tank 16 becomes constant, the generation of dripping is suppressed, the spray amount becomes constant, and the atomization is stable.

According to the fourth embodiment, the above-described first
The second storage tank can be arranged below the ultrasonic transducer 13c in addition to obtaining the effect of the embodiment, and the spray liquid can be reliably stored in the storage tank 12 without being affected by the fluctuation of the liquid amount. Can be sent to.

The depressurizing mechanism is composed of the first storage tank 12,
Of course, it may be provided in any of the second storage tanks 16.

[0049]

As described above, according to the present invention,
There are advantages that the atomized state can be stabilized, the influence of ventilation due to the difference in liquid quality can be prevented, and a practical ultrasonic spraying device that can prevent the occurrence of dripping can be realized.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of an ultrasonic spraying device according to the present invention.

FIG. 2 is a plan view showing a first embodiment of an ultrasonic atomizing device according to the present invention.

FIG. 3 is a diagram showing a configuration example of a pressure reducing mechanism according to the present invention.

FIG. 4 is a diagram showing another configuration example of the pressure reducing mechanism according to the present invention.

FIG. 5 is a vertical cross-sectional view showing an exploded ultrasonic transducer according to the present invention.

FIG. 6 is a diagram showing another configuration example of the liquid outlet valve according to the present invention.

FIG. 7 is a diagram showing still another configuration example of the liquid outlet valve according to the present invention.

FIG. 8 is a diagram showing another configuration example of the valve drive mechanism according to the present invention.

FIG. 9 is a diagram showing a configuration example of a dripping prevention pressurizing mechanism according to the present invention.

FIG. 10 is a cross-sectional view showing a second embodiment of the ultrasonic spraying device according to the present invention, and is a view showing a non-operating state.

FIG. 11 is a cross-sectional view showing a second embodiment of the ultrasonic spraying device according to the present invention, and a diagram showing an operating state.

FIG. 12 is a diagram showing another configuration example of the opening / closing mechanism.

FIG. 13 is a sectional view showing a third embodiment of the ultrasonic spraying device according to the present invention, and is a view showing a non-operating state.

FIG. 14 is a cross-sectional view showing a third embodiment of the ultrasonic spraying device according to the present invention, which is a view showing an operating state.

FIG. 15 is a sectional view showing a fourth embodiment of an ultrasonic spraying device according to the present invention.

FIG. 16 is a cross-sectional view showing a configuration of a conventional ultrasonic spraying device.

[Explanation of symbols]

 10, 10a, 10b, 10c ... Ultrasonic spraying device 11 ... Main body case 12 ... Storage tank 12a, 16a ... Filling port 12b, 16b ... Cap 12c ... Liquid outlet 13 ... Spraying block 13c ... Ultrasonic transducer 13d ... Sensor 13e ... Opening portion 13f ... Volume changing portion 13g ... Return switch 14 ... Spraying area 16 ... Second storage tank 17 ... Communication pipe 20 ... Spray liquid 30, 52 ... Solenoid 31 ... Valve shaft 32 ... Valve 34 ... Vent hole 35 ... Ventilation filter 36 ... Presser plates 40, 40a ... Pressure reducing mechanism 41 ... Lever 43 ... Volume changing unit 50 ... Valve 51 ... Valve lever 60 ... Lever 62 ... Link lever 70 ... Start switch

Claims (4)

[Claims] 1. An ultrasonic spraying device, comprising: a storage tank filled with spray liquid; and a spray block attached to the bottom of the storage tank and containing an ultrasonic transducer for spraying the spray liquid, the storage tank upper part. From the bottom to the lower part, a decompression unit for decompressing the inside of the storage tank to a constant pressure while the storage tank is filled with the spray liquid, and the storage tank and the spray block only during operation. An ultrasonic spraying device having a liquid outflow adjusting unit that allows the sprayed liquid to flow out into the spray block by communicating with each other. 2. An ultrasonic spraying device, comprising: a storage tank filled with spray liquid; and a spray block attached to the bottom of the storage tank and containing an ultrasonic transducer for spraying the spray liquid, the storage tank upper part. An ultrasonic spraying device having a vent hole extending downwardly from the bottom and an opening / closing means for holding the vent hole in an open state during operation and in a closed state during non-operation. 3. An ultrasonic spraying device having a spraying block which is attached to the bottom of the first storage tank and has an ultrasonic transducer for spraying the spraying liquid, the second storage tank being filled with the spraying liquid, A communication pipe for communicating the inside of the first storage tank with the inside of the second storage tank, a vent hole extending from an upper portion to a lower portion of the second storage tank, and a constant pressure in the first storage tank. An ultrasonic spraying device, comprising: a depressurizing unit for depressurizing the liquid and a liquid outflow adjusting unit for communicating the first storage tank with the spraying block only during operation so that the spraying liquid flows out into the spraying block. 4. The ultrasonic wave according to claim 1, 2 or 3, further comprising means for applying a pressure to the inside of the spray block at least when not operating to discharge the spray liquid remaining in the liquid spray end region of the ultrasonic transducer. Spraying equipment.