JP2000317416A - Ultrasonic cleaning machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the temperature elevation of externally exposed parts even at the time of long-term use by providing the machine with a heater cover so as to cover a heater, forming the heater cover to a double structure consisting of inner and outer covers, providing the respective covers with discharge holes and communicating the space region on the inner side of the heater cover and the discharge side of an air cooling fan. SOLUTION: The heater 2 is provided with the heater cover 21 so as to cover the heater 2 apart a prescribed spacing from the heater. The heater cover 21 consists of the inner cover 21A and outer cover 21B which are integrally formed via a prescribed gap layer 22. The inner cover 21A and the outer cover 21B are respectively provided with the plural discharge holes 21A and 21B. The structure to communicate the space region on the inner side of the heater cover 21 and the discharge side of cooling for 7 on the case body 3 side is adopted. As a result, the size reduction over the entire part of the device is made possible and the temperature of the outer cover 21B may be made relatively lower. Then, the temperature elevation of the externally exposure parts at the time of long-term use may be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic cleaner, and more particularly, to an ultrasonic cleaner having a cleaning tank equipped with a heater.

[0002]

2. Description of the Related Art Various types of ultrasonic cleaners have been conventionally proposed. Among them, recently, a method has been developed in which a heater is provided on a side wall portion of a cleaning tank, thereby heating a cleaning liquid to improve cleaning efficiency.

On the other hand, in such an ultrasonic cleaning machine with a heater, since the side plate portion of the cleaning tank is heated, it is not preferable that the heated area of the cleaning tank is exposed to the outside. In order to avoid this, while heating the part of the inner side plate with the side wall portion of the cleaning tank as a double structure, between the inner wall and the outer wall, filled with a heat insulating material so as to cover the heater described above,
As a result, it is attempted to effectively avoid in advance the occurrence of a burn accident or the like caused by carelessness of a worker. In this case, a wool-like, sponge-like or plate-like member made of glass, ceramic, asbestos, inorganic mineral fiber, or the like has been generally used as the heat insulating material.

[0004]

However, in the above-mentioned conventional example, when the ultrasonic cleaner is operated comparatively (for example, continuously for four hours or more), the temperature of the heat insulating material itself increases. Not the cover
The temperature exceeds 0 degrees, and further, the heat insulating material emits an unpleasant odor, for example, which is not suitable for long-time operation.

Further, in this conventional example, since the washing tank portion has a double structure, the whole apparatus is increased in size and weight, and there is a disadvantage that the stability is good but the portability is poor.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to improve the disadvantages of the prior art, and particularly to improve the vibration resistance and effectively suppress the increase in the temperature of the portion exposed to the outside even when used for a long time. It is an object of the present invention to provide an ultrasonic cleaner with a heater that can be downsized.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a cleaning tank having an opening at an upper portion thereof and a vibration plate at a bottom provided with an ultrasonic vibrator suspended therefrom, An ultrasonic cleaner comprising: a heater mounted on a side plate portion of a tank; and a case body holding the cleaning tank at a bottom portion and including an electric control system for driving the ultrasonic vibrator therein. In the above, the washing tank is provided with a heater cover so as to face the heater and cover the heater at a predetermined interval.

Also, an outside air inlet for air cooling is provided in a part of the case body, and an exhaust port is provided in another part of the case body, and the outside air introduced into the case body is forcibly supplied to the exhaust port area. Equipped with an air cooling fan to exhaust air. Further, the above-described heater cover is constituted by two layers of an inner cover and an outer cover formed with a predetermined gap layer therebetween, and a plurality of exhaust holes are provided in each of the inner cover and the outer cover. Then, a configuration is adopted in which the space area inside the heater cover communicates with the exhaust side of the air cooling fan described above.

According to the first aspect of the invention, when the air-cooling fan is operated, the outside air is forcibly sucked from the plurality of outside air introduction ports provided on the side surface of the case main body.
First, the electric control system provided in the case body and the plurality of ultrasonic vibrators suspended in the case body are cooled. Subsequently, the outside air sucked into the case main body is sent out from the exhaust port to the heater cover side by the air cooling fan. The outside air sent to the heater cover side is discharged to the outside after cooling the heater cover.

As a result, the temperature of the heater cover is suppressed from becoming high, and the heater is easy to use. Since the heater cover is provided with a two-layer structure having an air layer only inside the heated portion, the weight of the entire apparatus can be reduced. In this respect, the portability can be greatly improved, and the heat resistance and durability of the entire apparatus are enhanced.

According to a second aspect of the present invention, in the above-described ultrasonic cleaner according to the first aspect, the plurality of exhaust holes of the inner cover and the plurality of exhaust holes of the outer cover are formed so as to be mutually shifted. To do.

For this reason, in the invention according to claim 2,
In addition to functioning equivalently to the above-described first aspect of the invention, turbulence is generated between the inner cover and the outer cover, whereby the temperature of the outer cover can be more effectively suppressed.

According to a third aspect of the present invention, in the ultrasonic cleaner according to the first or second aspect, the lower end of the outer cover is connected to the exhaust port of an air-cooling fan provided in the case body. It is configured to extend to the case body side so as to cover.

Therefore, in the invention according to claim 3,
In addition to functioning equivalently to the above-described invention of claim 1 or 2, furthermore, the introduced outside air in the case main body can be effectively and reliably sent to the heater cover side, and the structure therefor can be greatly simplified. Therefore, the cost can be reduced.

According to a fourth aspect of the present invention, in the ultrasonic cleaner according to the first, second, or third aspect, the cleaning tank is connected to the case body via a vibration absorbing member. I am taking it.

Therefore, in the invention according to claim 4,
In addition to functioning equivalently to the above-described claim 1, 2, or 3, the vibration of the bottom portion (diaphragm portion) of the cleaning tank can be effectively suppressed from propagating to the case body. For this reason, it is possible to effectively avoid the inconvenience that the electric control system provided on the case body side is deteriorated by vibration.

According to a fifth aspect of the present invention, in the above-described ultrasonic cleaner according to the first, second, third, or fourth aspect, a flange member protrudes outwardly around the cleaning tank. The configuration is such that the cross section of the flange member is formed in an arc shape with the lower part opened.

Therefore, in the invention according to claim 5,
In addition to functioning equivalently to the above-described invention, the portability of the entire apparatus is improved, and the cleaning liquid spilled to the edge of the cleaning tank is quickly transmitted along the arc-shaped surface. Since the washing liquid that flows down into the tank does not fall down along the side surface of the case body, the electronic and electrical components in the case body can be effectively protected from water drops at this point. .

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 6, reference numeral 1 indicates a cleaning tank, reference numeral 2 indicates a heater,
Reference numeral 3 indicates a case body.

The cleaning tank 1 is rectangular and has an opening 1A at the top, and a plurality of ultrasonic vibrators 1C are provided at the bottom of the diaphragm 1B. This ultrasonic transducer 1C is:
In this embodiment, six ultrasonic transducers 1C are arranged in a staggered manner (see FIGS. 1 and 5), but the number of ultrasonic transducers 1C may be any number.

The above-described heater 2 is provided on the side wall of the cleaning tank 1. The heater 2 has a plate shape and is provided on an outer surface portion of a side wall in a longitudinal direction, and heats the cleaning liquid W inside through the side wall portion. Reference numeral 2a indicates a thermoswitch that operates at a predetermined temperature. The thermoswitch 2a is made of bimetal.

The above-mentioned case body 3 is disposed below the above-mentioned washing tank 1 to support the washing tank 1 and has therein the above-mentioned electric control system 6 for driving the ultrasonic vibrator and the inside thereof. An air cooling fan 7 and the like are provided.

This will be described in more detail. The cleaning tank 1 is formed using a stainless steel plate as a material. Around the opening 1A in the cleaning tank 1, a flange member 1E is protruded toward the outer periphery as shown in FIGS. The flange member 1E is formed in an arcuate cross section with the lower part opened.

As a result, not only is the cleaning tank 1 easy to hold and the portability of the entire apparatus is improved, but also the cleaning liquid spilled on the edge of the cleaning tank 1 returns to the cleaning tank 1 along the arc-shaped surface. On the other hand, the cleaning liquid that has spilled to the outside of the cleaning tank 1 falls as water droplets to the outside without transmitting along the side surface of the cleaning tank 1. Therefore, it is effectively prevented in advance that the spilled cleaning liquid travels along the side surface of the cleaning tank 1 and enters the case body 3 and touches the electric control system and the like.

Further, a flange member 1E protruding around the opening 1A has a cross section U along the curved surface at the center of the upper surface of each side.
A rubber plate 1P having a character shape is provided. This rubber plate 1P is formed of, for example, silicon rubber. As a result, even when held during transport, the hit becomes soft and the holding property is improved. Here, in the figure, the case where the rubber plate 1P is provided on the surface (convex surface) is illustrated, but it may be provided so as to be wound up to the concave surface.

The cleaning tank 1 is mounted on the above-described case body 3 via a plate-shaped vibration absorbing member 4, and is held by a tank receiving portion 3A described later. The vibration absorbing member 4 is made of rubber and is formed in a hollow square shape, and is provided along the entire surface of the tank receiving portion 3A of the case body 3.

The bottom portion 1D of the washing tank 1 forms a diaphragm, and a plurality of ultrasonic vibrators 1C are provided at the center thereof as described above. Each of the fixing bolts 1F for fixing the cleaning tank is projected downward and by welding or the like. Symbol 3A
Indicates a tank receiving portion which is bent inward around the upper end portion of the case body 3 and protrudes.

The fixing bolt 1F described above is fixed to the tank receiving portion 3A by a nut 11 with a washer while penetrating the plate-shaped vibration absorbing member 4 and the tank receiving portion 3A. FIG. 2 shows this fixing bolt 1F.
The connection structure of the parts is shown.

In FIG. 2, reference numeral 12 denotes a cylindrical spacer incorporated around the fixing bolt 1F. When the nut 11 with the washer is screwed into the fixing bolt 1F, the cylindrical spacer 12 is used for the plate-shaped vibration absorbing member 4 described above.
Has a function of maintaining a suitably compressed state so as not to impair the vibration absorbing function.

Around the cylindrical spacer 12, a cylindrical vibration absorbing member 13 made of rubber is provided so as to pass through the tank receiving portion 3 A together with the cylindrical spacer 12. As a result, the cylindrical vibration absorbing member 13 is always interposed between the cylindrical spacer 12 and the case main body 3 described above, so that vibration is always prevented from being transmitted from the cylindrical spacer 12 to the case main body 3, and at the same time, the cleaning is performed. The washing liquid W spilled from the tank 1 is effectively prevented from traveling along the washing tank 1 and entering the case body 3.

Further, the tank receiving portion 3 of the case body 3 described above.
A and a rubber washer 15
Thus, the vibration on the cleaning tank 1 side transmitted from the nut 11 with the washer to the case body 3 is always effectively prevented. Reference numeral 14 denotes a nut. This nut 14
Functions as a double nut in conjunction with the nut 11 with washer. Therefore, even if the fixing bolt 1F is vibrated, the nut 11 with the washer is firmly screwed, and the loosening thereof is effectively prevented.

That is, in the present embodiment, the cleaning tank 1 is fixedly mounted on the case body 3 via the plate-shaped vibration absorbing member 4, and the vibration of the fixing bolt 1F and the nut 11 with the washer is transmitted to the case body 3. Since the vibration is prevented by the cylindrical vibration-absorbing member 11 and the rubber washer 15, the transmission of the vibration of the cleaning tank 1 to the case body 3 is effectively prevented, so that the entire apparatus can be operated relatively quietly. .

Further, in this embodiment, a heater cover 21 is provided so as to face the heater 2 provided in the cleaning tank 1 at a predetermined interval and to cover the heater 2.

The heater cover 21 is provided with a predetermined gap layer 2.
2 and an inner cover 21A and an outer cover 21B formed integrally with each other. Each of the inner cover 21A and the outer cover 21B has a plurality of exhaust holes 21Aa, 21A.
Ba is provided respectively.

The plurality of exhaust holes 21Aa of the inner cover 21A and the plurality of exhaust holes 2 of the outer cover 21B are formed.
As shown in FIG. 4, the cover 21 is slightly shifted from each other in the vertical direction and the horizontal direction (or may be shifted only in the horizontal direction in FIG. 4). A turbulent exhaust flow is generated in the region, thereby increasing the air cooling effect on the inner cover 21A and the outer cover 21B, and at the same time, the cleaning liquid W (or splashing water) spilled from the cleaning tank 1 is exhausted from the heater cover 21 by the exhaust gas. The intrusion into the inside from the hole 21Ba is effectively eliminated, thereby protecting the electric and electronic components in the case main body 3.

The heater cover 21 is bent at the upper end and the left and right ends in FIG. 2 and is connected to the washing tank 1 in a sealed state. The lower end of the heater cover 21 is in the internal space of the case body 3 as described later. It has a communicating structure. Reference numerals 23A and 23B denote cover fixing portions that are covered with the heater cover 21 and fix the heater cover 21. The cover fixing portions 23A and 23B are arranged at predetermined intervals on both sides of the heater 2 described above, and are fixed to the side surface of the cleaning tank 1.

The case body 3 has an outside air introduction section 3 for air cooling.
1, 32 are provided. These outside air introduction parts 31, 32
Are provided on a part of each of the opposing side plates. Each of the outside air introduction portions 31 and 32 is composed of a plurality of outside air introduction ports 31a and 32a, respectively. Specifically, outside air introduction portions 31 and 32 are respectively provided on part of the side plates located at the left and right ends of the case main body 3 shown in FIG. FIG. 1 shows the position of the outside air introduction unit 32, and FIG.
1 is shown.

The outside air forced into the case body 3 is supplied to the side plate portion (the other part of the side plate) of the case body 3 located on the same side as the side on which the above-described heater cover 21 is provided. An air cooling fan 7 for forcibly exhausting air is provided. Reference numeral 3A denotes an exhaust port formed to face the air-cooling fan 7 and to send out the air in the case main body 3 to the above-described heater cover 21 side.

The outer cover 21B of the heater cover 21 has a lower end portion covering the exhaust port 3A of the case body 3 (a place where the air-cooling fan 7 is provided) so that the case body 3 is closed. Has been extended to. Thereby, the space area inside the heater cover 21 communicates with the exhaust side of the air-cooling fan 33, and the outside air forced into the case body 3 through the above-described outside air introduction portions 31 and 32 is exhausted. It is sent out to the above-mentioned heater cover 21 side through the opening 3A.

Here, reference numeral 21P indicates a rubber plate member having a predetermined thickness. The rubber plate member 21P is provided at the lower end of the above-described heater cover 21 (exactly, the outer cover 21B) at a position where it comes into contact with the case body 3 described above. For this reason, the rubber plate member 21P is formed in a U-shape along the periphery of the lower end of the heater cover 21.

Reference numeral 40 denotes a water supply / drain valve for supplying or draining the cleaning liquid into the cleaning tank 1. The water supply / drain valve 40 is provided at the bottom of the cleaning tank 1 via an L-shaped pipe 42. In the case body 3 described above, there is provided a power supply circuit for energizing the heater 3 and the air cooling fan 7 described above, or an electric control circuit for driving a vibrator for driving an ultrasonic vibrator. A control system 6 is provided. Reference numeral 3C indicates a circuit board provided with a part of these electric control systems.

Further, on the opposite side of the above-mentioned heater cover 21 of the case body 3, as shown in FIG. 6, a timer 34 for arbitrarily setting the above-mentioned driving time for the ultrasonic vibrator from the outside is provided. I have. Along with the timer 34, a heater switch 35 for connecting or disconnecting the heater 2 to or from the power supply circuit is provided. Reference numeral 36 denotes a power switch of the entire apparatus.

Next, the overall operation of the above embodiment will be described. When the cleaning liquid is introduced into the cleaning tank 1 by operating the water supply / drain valve 40, the power switch 36 is turned on, and the heater switch 35 is turned on (ON) at the same time. Operate at the same time. Here, the cleaning time of the object to be cleaned is set by the timer 34.

When the power switch 36 is turned on, the air cooling fan 7 operates. When the air cooling fan 7 operates,
A plurality of outside air inlets 31 provided on the side surface of the case body 3
a, 32a is forcibly sucked in the outside air, whereby the electric control system 6 provided in the case body 3
Further, the plurality of ultrasonic vibrators 1C hanging down in the case main body 3 are cooled.

Subsequently, the outside air sucked into the case main body 3 is sent out from the exhaust port 3A by the air cooling fan 7 toward the internal space of the heater cover 21. The outside air sent to the heater cover 21 side is
After cooling, it is discharged outside. And the timer 34
When the predetermined time set in the step elapses, the power supply circuit is turned off (OFF), and the operation of the entire apparatus ends.

As described above, according to the present embodiment, in the heater cover 21, as described above, the predetermined gap layer 2 is formed.
2, the inner cover 21A and the outer cover 21B are separated from each other.
The plurality of exhaust holes 21Aa of the outer cover 21B and the plurality of exhaust holes 21Ba of the outer cover 21B are slightly shifted from each other.
A turbulent flow of exhaust gas occurs between the inner cover 21A and the outer cover 21B of the inner cover 21A.
Thus, the air cooling effect of the outer cover 21B is increased. Therefore, it is possible to effectively lower the temperature of the outer cover 21B exposed to the outside.

As described above, when a plurality of ultrasonic vibrators are activated to start the cleaning operation of the cleaning tank 1, the diaphragm forming the bottom of the cleaning tank 1 vibrates. On the one hand, this vibration is indispensable for the cleaning operation. On the other hand, when this vibration propagates to the case body 3, it causes noise or peels off the wiring of the electric control system mounted on the case body 3. Inconvenience may occur and the durability of the entire apparatus may be impaired. For this reason, in this embodiment, in order to prevent such a situation from occurring in advance, the case main body 3 holds the cleaning tank 1 via the plate-shaped vibration absorbing member 4 as described above. Further, a cylindrical vibration-absorbing member 13 and a rubber washer 14 are incorporated in the fixing bolt 1F on the cleaning tank 1 side and the nut 13 with a washer which is screwed to the fixing bolt 1F. Because the equipment is fixedly mounted, vibrations that propagate to the case body 3 are greatly reduced,
In this respect, the vibration resistance and durability of the entire device are enhanced.

Further, in the above-described embodiment, since the cleaning tank 1 with the heater is realized without adopting the double structure of the cleaning tank 1, the size and weight can be reduced, and the cost can be reduced. A flange member protrudes outwardly around the opening 1A of the washing tank 1 and the cross section of the flange member is formed in an arc shape with an open bottom, so that it can be transported anywhere. Yes, and as described above, cleaning tank 1
It is possible to effectively prevent the spilled cleaning liquid from entering the case main body 3, and in this respect, it is possible to improve the durability of the electronic and electric components inside the apparatus.

[0049]

According to the present invention, the heater is covered with a heater cover having a plurality of exhaust holes. Since the inner space area and the exhaust side of the air cooling fan on the case body side are communicated with each other, it is not necessary to form a double structure of the entire cleaning tank portion in the conventional example, thereby maintaining the performance of the entire apparatus. It is possible to reduce the size and weight of the entire apparatus, and at the same time, to greatly improve portability. Further, the above-described heater cover is formed of a two-layer structure including an inner cover and an outer cover formed through a predetermined gap layer. And with multiple exhaust holes in each of the inner cover and outer cover,
An unprecedented and excellent ultrasonic cleaning that can cool the inner cover and the outer cover simultaneously and effectively shield the radiant heat of the heater with the inner cover, so that the temperature of the outer cover can be relatively low. Machine can be provided.

According to a second aspect of the present invention, in the ultrasonic cleaning apparatus of the first aspect, the plurality of exhaust holes of the inner cover and the plurality of exhaust holes of the outer cover are shifted from each other. As a result, in addition to functioning equivalently to the first aspect of the present invention, a turbulent flow can be generated between the inner cover and the outer cover, thereby further effectively increasing the temperature of the outer cover. It became possible to control.

According to a third aspect of the present invention, in the ultrasonic cleaner according to the first or second aspect, the lower end of the outer cover is connected to the exhaust port of the air cooling fan provided in the case body. It is configured to extend to the case body side so as to cover. For this reason,
According to the third aspect of the present invention, the first or second aspect described above.
In addition to functioning in the same manner as the described invention, furthermore, the outside air introduced into the case main body can be effectively and reliably sent to the heater cover side, and the structure therefor can be extremely simplified, and therefore, the entire apparatus can be simplified. The size and cost can be reduced.

According to a fourth aspect of the present invention, in the above-described ultrasonic cleaner according to the first, second, or third aspect, the cleaning tank is connected to the case body via a vibration absorbing member. I am taking it.

Therefore, according to the fourth aspect of the present invention,
In addition to having the same function and effect as the above-mentioned invention, the bottom part of the cleaning tank (diaphragm part)
The vibration of the case can be effectively prevented from propagating to the case body side, and the intrusion of the spilling cleaning liquid can be effectively suppressed. Therefore, the electric control system mounted on the case body side deteriorates due to vibration and water droplets. It is possible to avoid effective.

According to a fifth aspect of the present invention, in the above-described ultrasonic cleaner according to the first, second, third, or fourth aspect, a flange member is provided to protrude outward around the cleaning tank. Since the cross section of the flange member is formed in an arc shape with the lower part opened, it has the same operation and effect as the above-described invention of claim 1, 2, 3 or 4, and furthermore, The portability of the entire system is improved, and the cleaning liquid that has spilled to the edge of the cleaning tank quickly returns to the inside of the tank along the arc-shaped surface. It is possible to effectively suppress the intrusion into the device, and in this respect, there is an advantage that the durability of the entire device can be improved.

As described above, according to the present invention, even when used for a long time, it is possible to effectively suppress the increase in the temperature of the portion exposed to the outside without equipping the heat insulating material, and the vibration resistance is good. In addition, it is possible to provide an unprecedented superior ultrasonic cleaner with a heater that can effectively prevent the spilling cleaning liquid from entering the case body.

[Brief description of the drawings]

FIG. 1 is a partially omitted cross-sectional view showing one embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing an example of a vibration absorbing member disclosed in FIG.

FIG. 3 is a front view showing a cleaning tank and a case main body disclosed in FIG. 1;

FIG. 4 is a right side view of FIG. 3;

FIG. 5 is a plan view of FIG. 3;

FIG. 6 is a left side view of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cleaning tank 1A Opening 1C Ultrasonic vibrator 1D Diaphragm (bottom part) 1E Flange member 2 Heater 3 Case main body 3A Exhaust port 4 Plate-shaped vibration absorbing member as vibration absorbing member 6 Electric control system 7 Air cooling fan 21 Heater cover 21A Inside Cover 21Aa, 21Ba Exhaust hole 21B Outer cover 22 Void layer

Claims (5)

[Claims] 1. A cleaning tank having an upper opening and an ultrasonic vibrator suspended on a bottom vibration plate, a heater mounted on a side plate portion of the cleaning tank, and a holding tank for holding and cleaning the cleaning tank. An ultrasonic cleaning machine comprising: a case main body equipped with an electric control system for driving the ultrasonic vibrator; and the cleaning tank, wherein the heater is opposed to the heater at a predetermined interval. Equipped with a heater cover so as to cover, a part of the case main body is provided with an outside air inlet for air cooling, and another part of the case main body is provided with an exhaust port. Equipped with an air cooling fan for forcibly exhausting the introduced outside air, the heater cover is constituted by an inner cover and an outer cover formed through a predetermined gap layer, and each of the inner cover and the outer cover is provided. plural An ultrasonic cleaner, wherein an exhaust hole is provided, and a space area inside the heater cover communicates with an exhaust side of the air cooling fan. 2. The ultrasonic cleaner according to claim 1, wherein the plurality of exhaust holes of the inner cover and the plurality of exhaust holes of the outer cover are provided to be shifted from each other. Sonic cleaner. 3. The ultrasonic cleaner according to claim 1, wherein a lower end portion of the outer cover is disposed on the case body side so as to cover an exhaust port of an air cooling fan provided in the case body. An ultrasonic cleaner characterized by being extended up to. 4. The ultrasonic cleaner according to claim 1, wherein the cleaning tank is provided on a case body via a vibration absorbing member. 5. The ultrasonic cleaner according to claim 1, 2, 3 or 4, wherein a flange member is protruded around the cleaning tank toward the outside, and a cross section of the flange member is lowered. An ultrasonic cleaner characterized by being formed in an arc shape in which an opening is opened.