JP2008114141A - Ultrasonic cleaning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrasonic cleaning device in which the cleaning effect of ultrasonic wave is more enhanced by devising the device so that a washing solution in a cleaning tank is allowed to flow more smoothly, thereby more uniforming ultrasonic sound pressure in the cleaning tank. <P>SOLUTION: In this ultrasonic cleaning device provided with at least the cubic cleaning tank 1; an ultrasonic generation means 3 set in the cleaning tank; a cleaning solution circulation line 7 sucking the cleaning solution in the cleaning tank and returning again to the cleaning tank; and a circulation pump 8 and a deaeration device 9 provided in the cleaning solution circulation line, four corners in a plan view of the cleaning tank 1 are chamfered to form into circular or linear chamfered faces 28 (29), a cleaning solution sucking port 5 of the cleaning solution circulation line 7 is communicatingly opened at a position on a diagonal line connecting the upper corner to the lower corner of a cleaning tank side wall 1a or in the vicinity thereof, and near to the upper ridge of the cleaning tank, and a cleaning solution discharge port 6 is communicatingly opened at a position on the diagonal line or in the vicinity thereof, and near to the lower ridge of the cleaning tank. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an ultrasonic cleaning apparatus provided with a deaeration device.

  In industrial cleaning equipment, how to clean and finish dirt and burrs attached to parts and components is an important issue. Conventionally, an ultrasonic cleaning apparatus is used as one of such cleaning apparatuses.

  An ultrasonic cleaning device attaches an ultrasonic generator in a cleaning tank filled with a cleaning liquid and irradiates ultrasonic waves toward an object to be cleaned immersed in the cleaning liquid, thereby utilizing ultrasonic vibration energy. It is intended to remove and remove dirt and burrs attached to the surface of the cleaning object.

  In the case of such an ultrasonic cleaning device, it is known that the sound pressure of ultrasonic waves, that is, the vibration energy of ultrasonic waves, is greatly influenced by the concentration of dissolved air contained in the cleaning liquid. Propagation of sound waves is disturbed, energy loss is caused, sound pressure is reduced, and cleaning power is reduced. Therefore, a degassing device is conventionally attached to the ultrasonic cleaning device, and by reducing the dissolved air concentration in the cleaning liquid, it has been devised so that efficient and stable cleaning can be realized (see, for example, Patent Document 1). ).

  The deaeration device described in Patent Document 1 is an example of a membrane-type deaeration device using a deaeration membrane that allows only air to pass through. The deaeration chamber that is a sealed space is divided into two chambers by the deaeration membrane, The liquid to be degassed flows in one chamber, and the other chamber is connected to a vacuum pump and pulled at a negative pressure, so that the dissolved air in the liquid is sucked and removed through the degassing membrane. It is.

  However, in the case of the above deaeration device, the deaeration membrane is expensive and the cost of the device is high, and furthermore, the deaeration membrane must be replaced or backwashed at regular intervals, which is necessary for maintenance of the device. There was a drawback that it was expensive and time consuming. In general, the membrane type deaerator can be applied only to an aqueous cleaning solution, and is difficult to apply to a hydrocarbon-based or solvent-based cleaning solution.

  In addition to the membrane deaerator, a vacuum deaerator and a turbo deaerator are known. The vacuum deaerator is a device that fills the sealed deaeration tank with a certain amount of cleaning liquid and draws out the dissolved air in the cleaning liquid by drawing the air in the upper space of the tank with a vacuum pump. is there. The turbo-type deaeration device discharges the cleaning liquid in the deaeration tank at a large flow rate while reducing the supply amount of the cleaning liquid flowing into the deaeration tank after filling a certain amount of the cleaning liquid in the sealed deaeration tank. Thus, a pressure difference is given to the inlet side and the outlet side of the deaeration tank, and the dissolved air in the cleaning liquid in the deaeration tank is taken out and discharged by this pressure difference. However, these also have their merits and demerits, and all of deaeration efficiency, cost, and maintenance of the apparatus cannot be satisfied at the same time.

JP 2004-249215 A (all pages, all figures)

  Therefore, in order to solve the above problem, the present applicant has used a deaeration device which is excellent in deaeration efficiency, is inexpensive and easy to maintain, and is based on Japanese Patent Application No. 2005-331249. An ultrasonic cleaning device was proposed. The ultrasonic cleaning device proposed in Japanese Patent Application No. 2005-331249 can effectively remove dissolved air in the cleaning liquid while having a simple structure, and is extremely useful as this type of ultrasonic cleaning device. there were.

  Thereafter, as a result of further experiments and research on the ultrasonic cleaning device, the present inventor can further uniformize the ultrasonic sound pressure in the cleaning tank if the cleaning liquid in the cleaning tank flows more smoothly. And found that the ultrasonic cleaning effect can be further enhanced.

  The present invention has been made on the basis of the above knowledge, and by further improving the ultrasonic cleaning apparatus proposed in the above Japanese Patent Application No. 2005-331249, by devising the cleaning liquid in the cleaning tank to flow more smoothly. An object of the present invention is to provide an ultrasonic cleaning apparatus in which the ultrasonic sound pressure in the cleaning tank is further uniformed and the cleaning effect by ultrasonic waves is further enhanced.

In order to achieve the above object, the present invention employs the following means.
That is, at least a cleaning tank having a cubic shape, an ultrasonic wave generating means installed in the cleaning tank, a cleaning liquid circulation path for sucking the cleaning liquid in the cleaning tank and returning it to the cleaning tank, and the cleaning liquid circulation path In the ultrasonic cleaning apparatus provided with a circulation pump and a deaeration device provided in the middle, chamfering the four corners in plan view of the cubic cleaning tank into an arc shape or a linear chamfered surface, The cleaning liquid suction port of the cleaning liquid circulation path is opened on a diagonal line connecting the upper and lower corners of the cleaning tank side wall or in the vicinity thereof and close to the upper edge of the cleaning tank, and the cleaning liquid discharge port is formed on the diagonal line or on the diagonal line. It is characterized in that it opens in the vicinity and close to the lower edge of the cleaning tank. In addition to the above four corners in plan view, it is more desirable to form arcuate or straight chamfered surfaces at the four corners of the tank bottom where the bottom and side walls of the cleaning tank intersect.

  According to the present invention, the four corners in plan view of the cleaning tank having a cubic shape are chamfered to form an arc shape or a straight chamfered surface, so that the cleaning liquid circulating in the cleaning tank is in this arc shape. Alternatively, it flows along a straight chamfered surface, and the flow is not disturbed at the four corners of the cleaning tank as in the prior art. This eliminates the disturbance of ultrasonic waves due to turbulent flow and makes the sound pressure in the cleaning tank more uniform, which in combination with the effect of removing dissolved air by the degassing device realizes more stable ultrasonic cleaning. can do. Furthermore, in addition to the four corners in plan view, the cleaning liquid that circulates in the cleaning tank can be obtained by forming arcuate or straight chamfered surfaces at the four corners of the tank bottom where the bottom and side walls of the cleaning tank intersect. The flow becomes smoother and the generation of turbulent flow can be further reduced.

  In addition, the cleaning liquid suction port of the cleaning liquid circulation path is opened at a position on or near the diagonal line between the upper and lower corners of the cleaning tank side wall and close to the upper edge of the cleaning tank, and the cleaning liquid discharge port is connected to the cleaning tank side wall. Therefore, the circulating cleaning liquid circulates in the cleaning tank as an undisturbed water stream flowing in the same direction in the vicinity of the lower edge of the cleaning tank and near the lower edge of the cleaning tank. For this reason, a more stable ultrasonic cleaning can be realized by a synergistic effect with the rectifying action by the arc-shaped or linear chamfered surface.

1 to 4 show a first embodiment of an ultrasonic cleaning apparatus according to the present invention.
FIG. 1 is a diagram showing a configuration of the entire apparatus, FIG. 2 is a schematic perspective view showing a first structural example of the cleaning tank in FIG. 1, and FIG. 3 shows a second structural example of the cleaning tank in FIG. 4 and 4 are views showing the structure of the deaeration device in FIG.

  In FIG. 1, reference numeral 1 denotes a cubic cleaning tank filled with a cleaning liquid 2, and an ultrasonic generator (ultrasonic generator) 3 is attached to the bottom surface of the cleaning tank 1. Further, a heater (liquid temperature adjusting means) 4 is attached to the outer periphery of the cleaning tank 1 so that the temperature of the cleaning liquid 2 can be adjusted.

  As shown in FIG. 2 or FIG. 3, the four corners in plan view of the cleaning tank 1 having a cubic shape are chamfered by using an auxiliary member or the like, and an arc-shaped chamfered surface 28 (FIG. 2) or a straight line shape. The chamfered surface 29 (FIG. 3). Also, on one side wall 1 a of the cleaning tank 1, the cleaning liquid suction port 5 of the cleaning liquid circulation path 7 is on or near the diagonal d that forms the upper and lower corners of the cleaning tank side wall 1 a and near the upper edge of the cleaning tank 1. The cleaning liquid discharge port 6 is open at a position on or near the diagonal line d and near the lower edge of the cleaning tank 1.

  A circulation pump 8 for forcibly circulating the cleaning liquid is connected in the middle of the cleaning liquid circulation path 7 connecting the cleaning liquid suction port 5 and the discharge port 6, and the upstream side of the circulation pump 8 contains a cleaning liquid in the cleaning liquid. A degassing device 9 for separating dissolved air as bubbles is connected. Further, an air supply valve (air supply means) 10 capable of freely adjusting the valve opening degree is connected between the deaeration device 9 and the circulation pump 8.

  The air supply valve 10 is an air supply mechanism for supplying air from the outside into the cleaning liquid flowing in the cleaning liquid circulation path 7 and adjusting the dissolved air concentration of the cleaning liquid 2, and includes the deaerator 9 and the air. By controlling the supply valve 10, the dissolved air concentration in the cleaning liquid 2 can be freely controlled.

On the upstream side of the deaerator 9, a flow rate adjusting valve (flow rate adjusting unit) 11, a flow rate sensor (flow rate measuring unit) 12, a liquid temperature sensor (liquid temperature measuring unit) 13, a dissolved air concentration sensor (dissolved air concentration measuring unit). ) 14 is connected. A room temperature sensor (room temperature measuring means) 15 for measuring the temperature around the apparatus and a humidity sensor (humidity measuring means) 16 for measuring the humidity around the apparatus are also provided. Since the dissolved air concentration in the cleaning liquid is generally proportional to the amount of dissolved oxygen O _2, a dissolved oxygen measuring device is used as the dissolved air concentration sensor 14.

  A control device (control means) 17 controls the operation of the entire device, and receives measurement signals from the flow rate sensor 12, liquid temperature sensor 13, dissolved air concentration sensor 14, room temperature sensor 15, and humidity sensor 16. At the same time, based on these measurement signals, the circulation pump 8, the deaeration device 9, the air supply valve 10, the flow rate adjustment valve 11, and the heater 4 are controlled so that the dissolved air concentration of the cleaning liquid 2 becomes a predetermined value or a specified range. It is something to control. The control device 17 includes a data processing device such as a computer 18 or is externally attached. As shown in a control example described later, data necessary for control is collected and analyzed, and the concentration of dissolved air in the cleaning liquid Is conducive to control.

  As shown in FIG. 4, the deaeration device 9 includes a deformable elastic tube 91 having a predetermined length, and two actuators 92 a and 92 b are opposed to each other so as to sandwich the elastic tube 91. At the tips of the piston rods 93a and 93b of the two actuators 92a and 92b, pressure contacts 94a and 94b for pressing and deforming the elastic tube 91 from above and below are attached. As a material for the elastic tube 91, it is desirable to use fluorine rubber or the like that is resistant to hydrocarbon-based cleaning solutions and solvent-based cleaning solutions.

  The deaeration device 9 drives the actuators 92a and 92b to advance and retract the piston rods 93a and 93b, and presses the elastic tube 91 with the pressure contactors 94a and 9ab at the tips thereof to narrow the lumen sectional area. A diaphragm portion 95 (see FIG. 4B) having a small opening area is formed. When the circulating cleaning liquid reaches the portion of the throttle portion 95, the flow rate increases according to the amount of throttle, the dynamic pressure of the cleaning liquid increases rapidly and the static pressure decreases rapidly. When passing, the lumen cross-sectional area of the tube widens, so the flow rate is slowed down, the dynamic pressure of the cleaning liquid decreases rapidly, and the static pressure increases rapidly.

  When the rapid pressure change as described above occurs in the throttle unit 95, cavitation occurs on the downstream side of the throttle unit 95, and dissolved air dissolved in the cleaning liquid is separated into bubbles. The strength of the separation action of the dissolved air by the cavitation can be controlled by the size of the opening area of the throttle portion 95 of the elastic tube 91, that is, the advance / retreat amount of the piston rods 93a, 93b of the actuators 92a, 92b.

  In the above example, the elastic tube 91 is pressed and deformed using the two actuators 92a and 92b, but may be pressed and deformed using one actuator. Further, although the piston rod type actuator is used as the actuator, it may be of any type and structure as long as the pressure contacts 94a and 94b can be advanced and retracted, for example, a screw advance / retract type, a rack and pinion advance / retreat type. Various advancing and retracting mechanisms can be used, such as those of the type.

Next, the control of the dissolved air concentration in the ultrasonic cleaning apparatus will be described.
[1] Control example 1
The first control example is an example in the case where the dissolved air concentration of the cleaning liquid is controlled using the measurement result of the dissolved air concentration sensor 14. The control method will be described below.

  When the power of the ultrasonic cleaning apparatus is turned on, the control device 17 drives the circulation pump 8 to suck the cleaning liquid 2 in the cleaning tank 1 into the cleaning liquid circulation path 7 from the cleaning liquid suction port 5 in the upper part of the tank. Then, after making a round of the cleaning liquid circulation path 7, the cleaning liquid 2 is discharged again from the cleaning liquid discharge port 6 at the bottom of the tank and the cleaning liquid 2 is circulated. Further, the heater 4 is also controlled as necessary, and the temperature of the cleaning liquid 2 is controlled to be a specified temperature based on the liquid temperature signal output from the liquid temperature sensor 13.

  In this state, the control device 17 takes in the dissolved air concentration signal sent from the dissolved air concentration sensor 14 and monitors whether the dissolved air concentration of the cleaning liquid at that time is larger or smaller than a preset default value. As described above, when the dissolved air concentration is larger than the predetermined value, the sound pressure of the ultrasonic wave radiated from the ultrasonic generator 3 rapidly decreases, and it is difficult to perform good ultrasonic cleaning. Become.

  Therefore, when the dissolved air concentration is larger than the predetermined value, the control device 17 sends a control signal to the deaeration device 9 and drives the actuators 92a and 92b of the deaeration device 9 to advance the piston rods 93a and 93b. Then, the elastic tube 91 is pressed and deformed by the pressure contactors 94a and 94b at the tips thereof to form the throttle portion 95 (see FIG. 4B).

  When the constricted portion 95 is formed in the elastic tube 91, cavitation occurs on the downstream side of the constricted portion 95 as described above, and the air dissolved in the cleaning liquid becomes apparent as bubbles. The dissolved air that has become apparent as bubbles is discharged into the cleaning tank 1 from the cleaning liquid discharge port 6 together with the cleaning liquid. The bubbles discharged into the cleaning tank 1 rise in the cleaning liquid 2 due to their buoyancy. The liquid is discharged from the upper liquid surface of the cleaning tank 1 to the outside of the tank.

  When the bubble formation of the dissolved air by the cavitation is repeated, the cleaning liquid 2 in the cleaning tank 1 is gradually degassed, and the dissolved air concentration eventually becomes equal to or lower than a preset specified value. When the dissolved air concentration becomes equal to or lower than the predetermined value, an object to be cleaned (not shown) is immersed in the cleaning liquid 2, and ultrasonic cleaning is started by irradiating ultrasonic waves from the ultrasonic generator 3. This makes it possible to perform efficient and good ultrasonic cleaning without a decrease in sound pressure.

  The control device 17 monitors the dissolved air concentration signal output from the dissolved air concentration sensor 14 during the ultrasonic cleaning, and adjusts the throttle amount of the deaerator 9 so that the dissolved air concentration of the cleaning liquid does not exceed a predetermined value. Control. As a result, the dissolved air concentration of the cleaning liquid 2 in the cleaning tank 1 can always be kept below a predetermined value, and good ultrasonic cleaning without a decrease in sound pressure can be maintained.

  At this time, if the dissolved air concentration of the cleaning liquid is too small than the predetermined value, the air supply valve 10 is also controlled to open the air supply valve 10 and feed air into the cleaning liquid flowing in the cleaning liquid circulation path 7. Control may be performed to increase the dissolved air concentration. If the air supply control by the air supply valve 10 is used in combination, the dissolved air concentration can always be maintained within a certain range centered on the predetermined value, and better ultrasonic cleaning can be realized.

  In the above control, the four corners in plan view of the cleaning tank 1 are chamfered to form an arcuate chamfered surface 28 (FIG. 2) or a linear chamfered surface 29 (FIG. 3). For this reason, for example, in the case of an arc-shaped chamfered surface 28, the cleaning liquid 2 circulating in the cleaning tank 1 moves along the chamfered surface 28 as shown by an arrow in FIG. Thus, the flow is not disturbed at the four corners of the cleaning tank 1 as in the prior art. For this reason, the disturbance of the ultrasonic wave due to the turbulent flow is eliminated, the ultrasonic sound pressure in the cleaning tank 1 is made more uniform, and combined with the effect of removing the dissolved air by the degassing device 9, more stable ultrasonic cleaning Can be performed. The same applies to the case of the straight chamfered surface 29 (FIG. 3).

  Further, the cleaning liquid suction port 5 of the cleaning liquid circulation path 7 is opened to a position on or near the diagonal line d between the upper and lower corners of the cleaning tank side wall 1a and close to the upper edge of the cleaning tank 1, and the cleaning liquid discharge port 6 is open at a position close to or below the diagonal line d and near the lower edge of the cleaning tank 1, so that the circulating cleaning liquid 2 is indicated by an arrow in FIGS. 5 (a) and 5 (b). In addition, the water flows in the washing tank 1 in the same direction and circulates as an undisturbed water flow. For this reason, more stable ultrasonic cleaning can be performed by a synergistic effect with the rectifying action by the arc-shaped chamfered surface 28 (or the linear chamfered surface 29).

  According to the experiments by the present inventors, the dissolved air concentration for performing good ultrasonic cleaning has a problem even if it is too small, and it is desirable to set it to be 2.5 mg / l or more. There was found. Therefore, it is desirable that the target specified value of the dissolved air concentration be equal to or greater than this value.

  In the control of the dissolved air concentration, the throttle amount (lumen cross-sectional area) of the throttle portion 95 in the deaeration device 9 may be a constant throttle (constant cross-sectional area) regardless of the size of the dissolved air concentration. It is desirable to control so that the amount of aperture is changed in proportion to the amount of deviation from the specified value. Thereby, the dissolved air concentration can be lowered to a predetermined value in a shorter time.

  Similarly, if the opening of the air supply valve 10 is changed in proportion to the amount of deviation from the specified value of the dissolved air concentration, the dissolved air concentration that has decreased too much can be reduced in a shorter time. In the meantime, it can be pulled back to the predetermined value, and the dissolved air concentration can be more reliably maintained within a certain range.

[2] Control example 2
The second control example is an example in which the dissolved air concentration control operation is performed by a timer operation.

  Generally, the cleaning conditions in the ultrasonic cleaning apparatus are determined by the object to be cleaned and the specifications of the cleaning apparatus. Therefore, after the dissolved air concentration is controlled to the specified value by the control operation as shown in the control example 1 described above, the dissolved air concentration gradually deteriorates at an increasing rate according to the cleaning condition at that time. Accordingly, if the rate of increase of the dissolved air concentration is known in advance, the dissolved air concentration of the cleaning liquid is maintained within a predetermined range by intermittently operating the timer without performing the control operation of the control example 1 described above at all times. It is possible.

  Therefore, the rate of increase of the dissolved air concentration is obtained in advance by experiments or actual ultrasonic cleaning processing, and a predetermined time interval determined from the rate of increase is set in the control device 17 as a timer operating time. When the dissolved air concentration of the cleaning liquid 2 reaches a specified value by the control operation of the control example 1 described above, the circulation pump 8 is stopped to stop the deaeration process, and the circulation pump is again turned on when the set timer time has elapsed. 8 is driven to control the dissolved air concentration to be reduced by a timer operation. By repeating this, the dissolved air concentration can be maintained within the specified range. As a result, the cleaning cost can be reduced.

  Also in the case of this second control example, arc-shaped chamfered surfaces 28 or linear chamfered surfaces 29 formed at the four corners in plan view of the cleaning tank 1 are the same as in the case of the first control example. It can act and can raise the further cleaning effect.

[3] Control example 3
In the third control example, the time series data of the input / output signals of the ultrasonic cleaning device is analyzed using a computer 18 incorporated in or externally attached to the control device 17, and the ultrasonic cleaning device is analyzed by a plurality of dissolved air concentrations and the like. This is an example where a multivariate autoregressive model using state quantities as input / output signals is constructed on software, and the dissolved air concentration is controlled based on the constructed multivariate autoregressive model.

  As described above, the ultrasonic sound pressure in the cleaning tank 1 in ultrasonic cleaning varies greatly depending on the dissolved air concentration of the cleaning liquid. On the other hand, the dissolved air concentration depends on the shape of the cleaning tank, the circulation state of the cleaning liquid, and the liquid. It becomes a state distributed in a wide range by temperature, outside air temperature, humidity, and the like. For this reason, depending on the state of use of the cleaning device, it is difficult to specify the dissolved air concentration accurately only from a specific state quantity, for example, only the dissolved air concentration of the cleaning liquid or only the temperature and the outside temperature of the cleaning liquid. A case also comes out. Therefore, instead of the control using only the dissolved air concentration according to the control example 1 described above, the ultrasonic cleaning apparatus is constructed as a multivariate autoregressive model, and the dissolved air concentration is controlled based on the multivariate autoregressive model. It is a thing.

  The multivariate autoregressive modeling of the ultrasonic cleaning apparatus is realized on software by performing the following steps by a computer 18 attached to the control apparatus 17. In order to make the explanation easy to understand, in the following, a case where a multivariate autoregressive model that inputs and outputs three state quantities of dissolved air concentration, cleaning liquid temperature, and room temperature will be described as an example. Even when other state quantities such as flow rate and humidity are added to the variables, the processing itself can be performed in the same manner as the number of input / output variables increases.

(First step)
First, time-series data on the concentration of dissolved air, the temperature of the cleaning liquid, and room temperature is collected. In order to do this, an ultrasonic cleaning device is operated, and dissolved oxygen data output from the dissolved air concentration sensor 14, liquid temperature data output from the liquid temperature sensor 13, and room temperature data output from the room temperature sensor 15 are predetermined. Sample and collect over time (eg, 10-15 minutes).

(Second step)
The computer 18 analyzes the obtained dissolved air concentration, the temperature of the cleaning liquid, and the time series data for the three state quantities of room temperature. The multivariate self with the dissolved air concentration, the temperature of the cleaning liquid, and the room temperature as inputs and outputs. Build a regression model.

[Third step]
From the analysis by the obtained multivariate autoregressive model, the dissolved air concentration, the temperature of the cleaning liquid, the power contribution at room temperature, and the impulse response (closed system) are calculated.

[Fourth step]
From the impulse response of the dissolved air concentration, a “reference time for changing the dissolved air concentration” (time until the dissolved air concentration becomes equal to or less than the target specified value) is calculated.

[Fifth step]
A state model of the dissolved air concentration is created from the power contribution rate and the impulse response value, and based on this, the “estimated time of dissolved air concentration change” is calculated by correcting the calculated “reference time of dissolved air concentration change”. .

[6th step]
The deaeration amount (or deaeration time) until the dissolved air concentration reaches a specified value is calculated from the obtained “estimated time of change in dissolved air concentration”.

[Seventh step]
Based on the calculated deaeration amount (or deaeration time), the control device 17 controls the throttle amount (or deaeration time) of the deaeration device 9 so that the dissolved air concentration falls within a specified range. .

  If the above multivariate autoregressive model is used, the entire ultrasonic cleaning apparatus can be treated statistically. For this reason, even if each state quantity such as dissolved air concentration, liquid temperature, room temperature, flow rate, humidity, and ultrasonic sound pressure is complicatedly entangled and the relationship between the state quantities cannot be clearly related, the dissolved air concentration of the cleaning liquid Can be quickly and accurately controlled.

  In the above example, the time series data of each state quantity is collected immediately before the start of ultrasonic cleaning. However, the time series data of each state quantity collected and accumulated during the past ultrasonic cleaning work is used for many times. A variable autoregressive model may be constructed.

  In addition, after the ultrasonic cleaning of the object to be cleaned is started, the time series data of each state quantity is collected at regular time intervals, and the first time series data is collected based on the collected new time series data. The constructed multivariate autoregressive model may be modified. If such a learning function is added, the constructed multivariate autoregressive model can be evolved to be closer to the behavior of the ultrasonic cleaning device that is actually operating, realizing better ultrasonic cleaning can do.

  Also in the case of this third control example, arc-shaped chamfered surfaces 28 or linear chamfered surfaces 29 formed at the four corners in plan view of the cleaning tank 1 are the same as in the case of the first control example. It can act and can raise the further cleaning effect.

[4] Control example 4
The fourth control example is an example in which a propeller pump is used as the circulation pump 8 and the dissolved air concentration of the cleaning liquid is controlled to be in the range of 2.5 to 3.5 mg / l.

  As described above, when the cleaning liquid 2 is circulated using the propeller type pump as the circulation pump 8, when the bubbles generated in the deaeration device 9 reach the circulation pump 8, the bubbles are rotated by the circulation pump 8. Are further finely sheared by a propeller, and become very fine bubbles having a diameter of 10 to several tens of μm, so-called “microbubbles”. When the microbubbles are generated, the uniform dispersion of the cleaning liquid 2 in the cleaning tank 1 is further progressed by the action of the microbubbles, the dissolved air concentration becomes uniform over the entire cleaning tank, and the environment changes such as room temperature, humidity, and atmospheric pressure. Ultrasonic cleaning that is not affected can be realized. In addition, the dirt in the cleaning liquid is less likely to agglomerate, and large clumps are not generated.

  Also in the case of this fourth control example, arc-shaped chamfered surfaces 28 or linear chamfered surfaces 29 formed at the four corners in plan view of the cleaning tank 1 are the same as in the case of the first control example. It can act and can raise the further cleaning effect.

FIG. 6 shows a second embodiment of the ultrasonic cleaning apparatus according to the present invention.
In the second embodiment, as a deaeration device, a fixed deaeration device 19 as shown in FIG. 7 or a turbulent flow generation deaeration device as shown in FIGS. 22 is used. In addition, since parts other than the deaeration devices 19 and 22 use the same members as those in the first embodiment shown in FIG. 1, the same parts are denoted by the same reference numerals, and the details thereof are the same. Description is omitted.

  7 is made entirely of a non-deformable rigid pipe 20 such as metal or hard plastic. By narrowing the diameter of the rigid pipe 20 at an appropriate position, A fixed throttle 21 is formed in the middle of the flow path of the cleaning liquid.

  FIG. 8A shows a first example of a turbulent flow generation type deaeration device 22 in which the obstruction 24 having a triangular cross section is blocked in the cylindrical conduit 23 so as to block the flow of the cleaning liquid. Are orthogonally arranged. FIG. 8B shows a second example of the turbulent flow generation type deaeration device 22 in which the obstruction 24 having a quadrangular cross section is blocked in the cylindrical conduit 23 so as to block the flow of the cleaning liquid. Are orthogonally arranged. The deaerator 22 shown in FIGS. 8 (a) and 8 (b) causes the turbulent flow by obstructing the flow of the cleaning liquid by the obstacle 24 having a triangular section or a quadrangular section, respectively. By generating cavitation, the dissolved air in the cleaning liquid is bubbled.

  In the ultrasonic cleaning apparatus according to the second embodiment shown in FIG. 6, since the deaerators 19 and 22 used are fixed-aeration type or turbulent-flow type deaerators, the amount of restriction and the cross-section thereof. Although the shape cannot be changed, the dissolved air concentration of the cleaning liquid 2 can be adjusted by controlling the circulation pump 8, the air supply valve 10, the flow rate adjusting valve 11, and the like by the control device 17. It is also possible to control using the multivariate autoregressive model described above, and to perform ultrasonic cleaning using microbubbles.

  Further, also in the case of the second embodiment, the arc-shaped chamfered surface 28 or the linear chamfered surface 29 formed at the four corners in the plan view of the cleaning tank 1 is the case of the first control example. It is possible to increase the cleaning effect.

FIG. 9 shows a third embodiment of the ultrasonic cleaning apparatus according to the present invention.
In the third embodiment, propeller type deaerators 25 and 27 with a pump as shown in FIG. 10 or FIG. 11 are used as a deaerator. Since parts other than the deaerators 25 and 27 use the same members as those in the first embodiment shown in FIG. 1, the same parts are denoted by the same reference numerals, and details thereof are described. The detailed explanation is omitted.

  The deaeration device 25 in FIG. 10 forms the throttle part 25 by narrowing the diameter of the cleaning liquid inlet part of the pump chamber 81 of the circulation pump 8 connected to the cleaning liquid circulation path. In addition, 82 is a propeller (rotary blade) for feeding cleaning liquid.

  The deaerator 27 in FIG. 11 has an airfoil shape of the propeller 82 for supplying cleaning liquid disposed in the pump chamber 81 of the circulation pump 8 connected to the cleaning liquid circulation path, and has an asymmetrical shape around the rotating propeller 82. In this case, cavitation is generated.

  Also in the case of the ultrasonic cleaning apparatus according to the third embodiment shown in FIG. 9, the control device 17 controls the circulation pump 8, the air supply valve 10, the flow rate adjustment valve 11, etc., thereby dissolving the cleaning liquid. The air concentration can be adjusted. In addition, it is possible to control using the multivariate autoregressive model described above or to perform ultrasonic cleaning using microbubbles.

  Further, also in the case of the third embodiment, the arc-shaped chamfered surface 28 or the straight chamfered surface 29 formed at the four corners in the plan view of the cleaning tank 1 is the case of the first control example. It can act in the same way and can increase the cleaning effect.

  In the above-described embodiment, an example in which arc-shaped or straight chamfered surfaces 28 and 29 are formed only at the four corners in plan view of the cleaning tank 1 has been described. In addition to the four corners in plan view, as shown in FIGS. 12 (a) and 12 (b), the four corners of the tank bottom where the bottom surface and the side wall of the cleaning tank 1 intersect are also included. Arc-shaped or straight chamfered surfaces 30 and 31 may be formed. As described above, if the arc-shaped or linear chamfered surfaces 30 and 31 are formed at the four corners of the bottom of the cleaning tank 1, the flow of the cleaning liquid circulating in the cleaning tank 1 is smoother. Therefore, the generation of turbulent flow can be further reduced, and a further excellent cleaning effect can be achieved.

It is a figure which shows the whole structure of the ultrasonic cleaning apparatus which concerns on 1st Embodiment. It is a schematic perspective view which shows the 1st structural example of the washing tank used with the ultrasonic cleaning apparatus of FIG. It is a schematic perspective view which shows the 2nd structural example of the washing tank used with the ultrasonic cleaning apparatus of FIG. FIG. 2 shows a structural example of a deaeration apparatus used in the ultrasonic cleaning apparatus of FIG. 1, (a) is a schematic cross-sectional view showing a state where the elastic tube is not pressed, and (b) is a state where the elastic tube is pressed and deformed. FIG. 6 is a schematic cross-sectional view showing a state where a throttle portion is formed. It is explanatory drawing which shows the flow of the washing | cleaning liquid at the time of using the washing tank of FIG. 2, Comprising: (a) is the schematic plan view, (b) is the schematic side view. It is a figure which shows the whole structure of the ultrasonic cleaning apparatus which concerns on 2nd Embodiment. FIG. 7 is a schematic cross-sectional view showing a first structure example of a deaeration device used in an ultrasonic device according to the second embodiment in FIG. 6. 6A is a schematic cross-sectional view showing a second structure example of a deaeration device used in the ultrasonic apparatus according to the second embodiment of FIG. 6, and FIG. 6B is a diagram of the second embodiment of FIG. It is a schematic sectional drawing which shows the 3rd structural example of the deaeration apparatus used with the ultrasonic cleaning apparatus which concerns. It is a figure which shows the whole structure of the ultrasonic cleaning apparatus which concerns on 3rd Embodiment. FIG. 10 is a schematic cross-sectional view illustrating a first structure example of a deaeration apparatus used in an ultrasonic cleaning apparatus according to the third embodiment in FIG. 9. FIG. 10 is a schematic cross-sectional view showing a second structure example of the deaeration device used in the ultrasonic cleaning device according to the third embodiment in FIG. 9. It shows an example in which the four corners of the tank bottom are also chamfered. (A) is an example in the case of an arc-shaped chamfered surface, and (b) is in the case of a straight chamfered surface. It is an example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cleaning tank 1a Side wall of cleaning tank 2 Cleaning liquid 3 Ultrasonic generator (ultrasonic generating means)
4 Heater (liquid temperature control means)
5 Cleaning liquid suction port 6 Cleaning liquid discharge port 7 Cleaning liquid circulation path 8 Circulating pump 9 Deaerator 10 Air supply valve (air supply means)
11 Flow control valve (flow control means)
12 Flow rate sensor (flow rate measuring means)
13 Liquid temperature sensor (liquid temperature measuring means)
14 dissolved air concentration sensor (dissolved air concentration measuring means)
15 Room temperature sensor (room temperature measuring means)
16 Humidity sensor (humidity measurement means)
17 Control device (control means)
DESCRIPTION OF SYMBOLS 18 Computer 19 Deaeration device 20 Rigid pipe 21 Restriction part 22 Deaeration device 23 Pipe line 24 Obstacle 25 Deaeration device 26 Restriction part 27 Deaeration device 28 Arc-shaped chamfered surface of four corners in plan view 29 Plane view Linear chamfered surfaces at the four corners 30 Arc-shaped chamfered surfaces formed at the corners of the tank bottom 31 Linear chamfered surfaces formed at the corners of the tank bottom 81 Pump chamber 82 Pump propeller 91 Elasticity Tube 92a, 92b Actuator 93a, 93b Piston rod 94a, 94b Pressure contactor 95 Restriction part

Claims (2)

At least a cleaning tank having a cubic shape, an ultrasonic wave generating means installed in the cleaning tank, a cleaning liquid circulation path for sucking the cleaning liquid in the cleaning tank and returning it to the cleaning tank again, and in the middle of the cleaning liquid circulation path In an ultrasonic cleaning apparatus provided with a provided circulation pump and deaeration device,
The four corners in plan view of the cleaning tank that is in the shape of a cube are chamfered into an arc shape or a straight chamfered surface, and the cleaning liquid suction port of the cleaning liquid circulation path is on a diagonal line that forms the upper and lower corners of the cleaning tank side wall. Alternatively, the cleaning liquid discharge port is opened at a position close to the upper edge of the cleaning tank and near the lower edge of the cleaning tank. Ultrasonic cleaning device.   2. The ultrasonic cleaning apparatus according to claim 1, wherein arcuate or straight chamfered surfaces are also formed at four corners of the bottom of the tank where the bottom and side walls of the cleaning tank intersect.

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