CN113731937B - Pressure control optimization method for vacuum ultrasonic cleaning machine - Google Patents
Pressure control optimization method for vacuum ultrasonic cleaning machine Download PDFInfo
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- CN113731937B CN113731937B CN202111063818.4A CN202111063818A CN113731937B CN 113731937 B CN113731937 B CN 113731937B CN 202111063818 A CN202111063818 A CN 202111063818A CN 113731937 B CN113731937 B CN 113731937B
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- 238000004506 ultrasonic cleaning Methods 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000005457 optimization Methods 0.000 title claims abstract description 11
- 238000004140 cleaning Methods 0.000 claims abstract description 51
- 230000000694 effects Effects 0.000 claims abstract description 27
- 238000007872 degassing Methods 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims description 30
- 238000010407 vacuum cleaning Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 8
- 102000004190 Enzymes Human genes 0.000 claims description 6
- 108090000790 Enzymes Proteins 0.000 claims description 6
- 230000007423 decrease Effects 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000002238 attenuated effect Effects 0.000 description 6
- 230000003247 decreasing effect Effects 0.000 description 6
- 238000005406 washing Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000009194 climbing Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
- B08B3/12—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by sonic or ultrasonic vibrations
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Abstract
The invention belongs to the technical field of cleaning machines, and relates to a pressure control optimization method for a vacuum ultrasonic cleaning machine, which comprises the following steps: (1) and (3) installing the ultrasonic sound intensity tester on the vacuum ultrasonic cleaning machine. (2) The ultrasonic sound intensity tester respectively acquires a plurality of groups of internal chamber energy densities under different internal chamber pressures at different working temperatures of the vacuum ultrasonic cleaning machine. (3) And respectively drawing a plurality of groups of inner chamber energy densities under different inner chamber pressures at different working temperatures to form a curve graph of the inner chamber energy density at each working temperature along with the change of the inner chamber pressure. (4) Threshold lines are drawn on the graph of the change of the energy density of the inner chamber with the pressure of the inner chamber at each working temperature. (5) And drawing a curve chart of the energy density change of the inner chamber under the normal pressure at different temperatures. (6) The invention realizes the optimization of the ultrasonic power density and ensures that the vacuum ultrasonic cleaner can simultaneously achieve the optimal degassing effect and cleaning effect.
Description
Technical Field
The invention relates to a pressure control optimization method for a vacuum ultrasonic cleaning machine, and belongs to the technical field of cleaning machines.
Background
When a conventional vacuum ultrasonic cleaning machine is used for cleaning, firstly, a to-be-cleaned part is placed in cleaning liquid in a cleaning tank at normal temperature and normal pressure, the cleaning liquid permeates into the to-be-cleaned part, then the temperature of the vacuum ultrasonic cleaning machine is directly raised to 48 ℃, vacuum degassing treatment is carried out in the temperature raising process, and after the degassing treatment is finished, ultrasonic cleaning and pulsating vacuum cleaning are carried out on the to-be-cleaned part in sequence; because the lower the pressure is, the better the degassing effect is, the lower the working pressure of the existing vacuum ultrasonic cleaning machine is set to be about-80 kpa generally in the degassing stage, but the working pressure is not actually verified, and in the long-term test process of vacuum ultrasonic energy, the fact that the lower the working pressure of about-80 kpa has the better degassing effect is found, but the best cleaning effect cannot be achieved in the ultrasonic cleaning stage of the vacuum ultrasonic cleaning machine, so that a to-be-cleaned part cannot be thoroughly cleaned.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method overcomes the defects of the prior art, provides the pressure control optimization method of the vacuum ultrasonic cleaning machine, realizes the optimization of the ultrasonic power density, and ensures that the ultrasonic cleaning stage of the vacuum ultrasonic cleaning machine can simultaneously achieve the optimal degassing effect and the cleaning effect.
The invention relates to a pressure control optimization method of a vacuum ultrasonic cleaning machine, which comprises the following steps:
(2) and installing the ultrasonic sound intensity tester on the vacuum ultrasonic cleaning machine.
(2) The ultrasonic sound intensity tester respectively collects a plurality of groups of inner chamber energy densities under different inner chamber pressures at different working temperatures of the vacuum ultrasonic cleaning machine.
(3) And respectively drawing a plurality of groups of inner chamber energy densities under different inner chamber pressures at different working temperatures to form a curve graph of the inner chamber energy density at each working temperature along with the change of the inner chamber pressure.
(4) Threshold lines are plotted on the plot of inner chamber energy density versus inner chamber pressure for each operating temperature.
(5) And drawing a curve chart of the energy density change of the inner chamber under the normal pressure at different temperatures.
(6) And drawing a pressure and temperature control curve chart of the vacuum ultrasonic cleaning machine in the cleaning stage.
Preferably, in the step (1), the ultrasonic sound intensity tester is fixed in the middle of the sealing door at the top of the vacuum ultrasonic cleaning machine through the first sealing block and the second sealing block, so that the distance between the position of the ultrasonic sound intensity tester and the ultrasonic transducer assemblies correspondingly arranged on the two sides of the vacuum ultrasonic cleaning machine is equal, and the test result is more accurate.
Preferably, the ultrasonic sound intensity tester passes through the middle through hole after the first sealing block and the second sealing block are buckled, and the first sealing block and the second sealing block are fastened through screws. 595 silica gel can be smeared between the first sealing block and the second sealing block to increase the sealing effect.
Preferably, in the step (3), each operating temperature of the graph of the energy density of the inner chamber along with the change of the pressure of the inner chamber takes a certain temperature point in the range of 30-65 ℃. The activity range of the cleaning enzyme used in the working process of the vacuum ultrasonic cleaner is generally 30-55 ℃, so the temperature of the working medium of the vacuum ultrasonic cleaner is not more than 55 ℃; but in order to better contain this temperature range for the curve drawn in the plot of inner chamber energy density versus inner chamber pressure, the upper temperature limit was set at 65 ℃. The invention respectively draws the curve graph of the energy density of the inner chamber along with the change of the pressure of the inner chamber under the working temperatures of 30 ℃, 36 ℃, 38 ℃, 40 ℃, 48 ℃, 55 ℃, 60 ℃ and 65 ℃, and totally collects 49 groups of data under the working temperatures of 30 ℃, 36 ℃, 38 ℃, 40 ℃, 48 ℃, 55 ℃, 60 ℃ and 65 ℃, and respectively draws the curve graph of the energy density of the inner chamber along with the change of the pressure of the inner chamber under each working temperature.
Preferably, in the graph of the change of the energy density of the inner chamber at each working temperature in the step (3) along with the pressure change of the inner chamber, the abscissa is the pressure of the inner chamber and ranges from-90 kpa to 10kpa, and the ordinate is the energy density of the inner chamber and has the unit of W/inch 2 . The pressure range of the inner chamber on the abscissa is set to better include the pressure change range of the inner chamber which is set in the working process of the vacuum ultrasonic cleaning machine from-85 kpa to 0kpa.
Preferably, the threshold line in step (4) is the threshold value at the operating temperature, which is 90% of the mean value of the energy densities of the array inner chambers when the pressure of the inner chamber is at 0kpa. The threshold line is set to more intuitively see the amplitude of the change of the energy density of the inner chamber along with the pressure of the inner chamber at each working temperature.
Preferably, the graph of the energy density variation of the inner chamber under normal pressure at different temperatures in the step (5) is a connection line which is taken from the mean values of the energy densities of the plurality of groups of inner chambers at each working temperature when the pressure of the inner chamber is at 0kpa. Because the energy density of the inner chamber at each working temperature is in an attenuation trend within the pressure range of-50 kpa to 0kpa, the initial energy density value of the inner chamber when the pressure of the inner chamber is 0kpa is the maximum value within the pressure range of-50 kpa to 0kpa; the energy density of the inner chamber varies irregularly after the pressure of the inner chamber is lower than-50 kpa. Therefore, the working temperature suitable for the ultrasonic cleaning stage of the vacuum ultrasonic cleaning machine can be seen from the inner chamber energy density change curve chart at different temperatures and normal pressure made by taking the average value of the plurality of groups of inner chamber energy densities when the inner chamber pressure is at 0kpa under each working temperature.
Preferably, the abscissa of the pressure and temperature control curve graph of the vacuum ultrasonic cleaner in the cleaning stage in the step (6) is the working time of the vacuum ultrasonic cleaner, the left ordinate is the temperature range, and the right ordinate is the pressure curve. In the pressure and temperature control curve chart in the cleaning stage of the vacuum ultrasonic cleaning machine, the temperature change curve is drawn by adopting a dotted line, and the pressure change curve is drawn by adopting a solid line, so that the pressure change curve is convenient to distinguish.
Preferably, the vacuum ultrasonic cleaner has two temperature rise links in the working process in the pressure and temperature control curve chart in the cleaning stage of the vacuum ultrasonic cleaner. The first temperature raising step raises the temperature to 40 deg.c to maximize the energy density of the inner chamber of the washing tank at 40 deg.c and to obtain optimal ultrasonic cleaning effect, and the second temperature raising step raises the temperature of the inner chamber of the washing tank from 40 deg.c for ultrasonic cleaning to 48 deg.c for pulsating vacuum cleaning.
Preferably, the working temperature of the ultrasonic cleaning stage of the vacuum ultrasonic cleaning machine in the pressure and temperature control curve chart of the cleaning stage of the vacuum ultrasonic cleaning machine is 40 ℃, and the working pressure is-50 kpa to-20 kpa. In the pressure and temperature control curve chart of the cleaning stage of the vacuum ultrasonic cleaning machine, the temperature point corresponding to the minimum inner chamber energy density when the inner chamber pressure is 0kpa is 48 ℃, and the inner chamber energy density is 143.3636W/inch 2 The temperature point of the maximum inner chamber energy density is 60 ℃, and the inner chamber energy density is 143.3636W/inch 2 . Due to the activity of the cleaning enzyme used in the working process of the vacuum ultrasonic cleanerThe range is 30-55 ℃ in general, and the energy density of the inner chamber is 138W/inch 2 Fluctuation up and down, the fluctuation range is less than 4%, when the working temperature is 40 ℃, the energy density of the inner chamber is the maximum, and is 141.5W/inch 2 . Therefore, when the working temperature is 40 ℃ under normal pressure, the ultrasonic cleaning effect of the vacuum ultrasonic cleaning machine is best, but in order to prevent air from being secondarily dissolved into water in the ultrasonic cleaning process, the ultrasonic cleaning is carried out under micro negative pressure, and according to a curve graph of the energy density of the inner chamber along with the pressure change of the inner chamber, the energy density of the inner chamber with the pressure of the inner chamber ranging from-50 kpa to-20 kp is not lower than 90% of the maximum energy density of the inner chamber (which means the energy density of the inner chamber with the working temperature of 40 ℃), so that the pressure value of the inner chamber in the ultrasonic cleaning stage of the vacuum ultrasonic cleaning machine can meet the value within the range from-50 kpa to-20 kp.
Compared with the prior art, the invention has the following beneficial effects:
the invention can visually confirm the inner chamber pressure in the ultrasonic cleaning stage of the vacuum ultrasonic cleaning machine by drawing the inner chamber energy density change-with-inner chamber pressure curve graph at each working temperature, the inner chamber energy density change curve graph at normal pressure at different temperatures and the pressure temperature control curve graph in the cleaning stage of the vacuum ultrasonic cleaning machine, and in the first heating link before the ultrasonic cleaning stage, a vacuum system is started to carry out degassing treatment at the moment before the inner chamber temperature is close to 40 ℃, thereby not only improving the working efficiency of the vacuum ultrasonic cleaning machine, but also ensuring that the vacuum ultrasonic cleaning machine has better degassing effect and stronger ultrasonic cleaning effect. The temperature rise process of the vacuum ultrasonic cleaning machine is divided into two times, the temperature rise step is carried out to 40 ℃ in the first time, the energy density of the inner chamber of the cleaning tank in a normal pressure state is the maximum when the temperature of the inner chamber is 40 ℃, the best ultrasonic cleaning effect can be obtained, and the cleaning temperature of the inner chamber of the cleaning tank is increased from 40 ℃ which is most suitable for ultrasonic cleaning to 48 ℃ which is most suitable for pulsating vacuum cleaning in the second time after the ultrasonic cleaning, so that the ultrasonic energy density is maximized, and the cleaning effect of the vacuum ultrasonic cleaning machine is improved.
Drawings
FIG. 1 is a schematic view of a vacuum ultrasonic cleaner equipped with an ultrasonic sound intensity tester;
FIG. 2 is an enlarged schematic view of the ultrasonic sound intensity tester;
FIG. 3 is a graph of internal chamber energy density as a function of internal chamber pressure at an operating temperature of 30 ℃;
FIG. 4 is a graph of internal chamber energy density as a function of internal chamber pressure at an operating temperature of 36 ℃;
FIG. 5 is a graph of internal chamber energy density as a function of internal chamber pressure at an operating temperature of 38 ℃;
FIG. 6 is a graph of inner chamber energy density as a function of inner chamber pressure at an operating temperature of 40 ℃;
FIG. 7 is a graph of internal chamber energy density as a function of internal chamber pressure at an operating temperature of 48 ℃;
FIG. 8 is a graph of internal chamber energy density as a function of internal chamber pressure at an operating temperature of 55 ℃;
FIG. 9 is a graph of internal chamber energy density as a function of internal chamber pressure at an operating temperature of 60 ℃;
FIG. 10 is a graph of inner chamber energy density as a function of inner chamber pressure at an operating temperature of 65 ℃;
FIG. 11 is a graph of energy density change of the inner chamber at atmospheric pressure at different temperatures;
FIG. 12 is a summary of the curves of FIGS. 3-10;
fig. 13 is a graph of pressure and temperature control during the cleaning phase of the vacuum ultrasonic cleaner.
In the figure: 1. an ultrasonic sound intensity tester; 2. a sealing door; 3. an ultrasonic transducer assembly; 4. a cleaning tank; 5. a first sealing block; 6. a second sealing block; 7. and (4) screws.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1-13, the method for optimizing the pressure control of the vacuum ultrasonic cleaning machine according to the present invention includes the following steps:
(1) the ultrasonic sound intensity tester 1 is installed on a vacuum ultrasonic cleaning machine.
(2) The ultrasonic sound intensity tester 1 respectively acquires a plurality of groups of internal chamber energy densities under different internal chamber pressures at different working temperatures of the vacuum ultrasonic cleaning machine.
(3) And respectively drawing a plurality of groups of inner chamber energy densities under different inner chamber pressures at different working temperatures to form a curve graph of the inner chamber energy density at each working temperature along with the change of the inner chamber pressure.
(4) Threshold lines are plotted on the plot of inner chamber energy density versus inner chamber pressure for each operating temperature.
(5) And drawing a curve chart of the energy density change of the inner chamber under the normal pressure at different temperatures.
(6) And drawing a pressure and temperature control curve chart of the vacuum ultrasonic cleaning machine in the cleaning stage.
In this embodiment:
as shown in fig. 1-2, in the step (1), the ultrasonic sound intensity tester 1 is fixed in the middle of the sealing door 2 at the top of the vacuum ultrasonic cleaning machine through the first sealing block 5 and the second sealing block 6, so as to ensure that the distance between the position of the ultrasonic sound intensity tester 1 and the ultrasonic transducer assemblies 3 correspondingly arranged at two sides of the vacuum ultrasonic cleaning machine is equal, and the test result is more accurate. The ultrasonic sound intensity tester 1 penetrates through the middle through hole after the first sealing block 5 and the second sealing block 6 are buckled, and the first sealing block 5 and the second sealing block 6 are fastened through the screw 7. 595 silica gel can be coated between the first sealing block 5 and the second sealing block 6 to increase the sealing effect.
And (3) taking a certain temperature point in the range of 30-65 ℃ as each working temperature of the inner chamber energy density variation curve graph along with the inner chamber pressure. The activity range of the cleaning enzyme used in the working process of the vacuum ultrasonic cleaner is generally 30-55 ℃, so the temperature of the working medium of the vacuum ultrasonic cleaner is not more than 55 ℃; but in order to better contain this temperature range for the curve drawn in the plot of inner chamber energy density versus inner chamber pressure, the upper temperature limit was set at 65 ℃. The invention respectively draws the curve graph of the energy density of the inner chamber along with the change of the pressure of the inner chamber under the working temperatures of 30 ℃, 36 ℃, 38 ℃, 40 ℃, 48 ℃, 55 ℃, 60 ℃ and 65 ℃, and totally collects 49 groups of data under the working temperatures of 30 ℃, 36 ℃, 38 ℃, 40 ℃, 48 ℃, 55 ℃, 60 ℃ and 65 ℃, and respectively draws the curve graph of the energy density of the inner chamber along with the change of the pressure of the inner chamber under each working temperature.
The abscissa of a graph of the change of the energy density of the inner chamber at each working temperature in the step (3) along with the pressure of the inner chamber is the pressure of the inner chamber, the range is-90 kpa-10 kpa, the ordinate is the energy density of the inner chamber, and the unit is W/inch 2 . The pressure range of the inner chamber on the abscissa is set to better include the pressure change range of the inner chamber which is set in the working process of the vacuum ultrasonic cleaning machine from-85 kpa to 0kpa.
And (4) taking 90% of the mean value of the energy densities of the array inner chambers when the pressure of the inner chambers is 0kpa as the threshold value at the working temperature. The threshold line is set to more intuitively see the amplitude of the change of the energy density of the inner chamber along with the pressure of the inner chamber at each working temperature.
And (5) respectively taking the mean value of the energy densities of the inner chambers of the groups at each working temperature when the pressure of the inner chambers is 0kpa as a curve of the energy density change curves of the inner chambers at different temperatures under normal pressure. Because the energy density of the inner chamber at each working temperature is in an attenuation trend within the pressure range of minus 50kpa to 0kpa, the initial energy density value of the inner chamber when the pressure of the inner chamber is 0kpa is the maximum value within the pressure range of minus 50kpa to 0kpa; the energy density of the inner chamber varies irregularly after the pressure of the inner chamber is lower than-50 kpa. Therefore, the working temperature suitable for the ultrasonic cleaning stage of the vacuum ultrasonic cleaner can be seen from the inner chamber energy density change curve chart at different temperatures and normal pressures, which is made by taking the average value of the energy densities of the plurality of groups of inner chambers when the pressure of the inner chamber is at 0kpa under each working temperature.
As shown in fig. 3, when the working temperature of the vacuum ultrasonic cleaning machine is 30 ℃, the energy density of the inner chamber is gradually reduced along with the gradual reduction of the pressure of the inner chamber, the energy density of the inner chamber is approximately linearly attenuated in the process of reducing the pressure of the inner chamber from 0kpa to-60 kpa, and after the pressure of the inner chamber is reduced to-60 kpa, the energy density of the inner chamber enters a disordered state, so that the fluctuation range is relatively large. Since the inner chamber energy density tends to decay, 90% of the mean value of the initial inner chamber energy density (referring to the inner chamber energy density at an inner chamber pressure of 0 kpa) corresponding to all the curves in fig. 3 corresponds to the threshold line plotted in fig. 3, so that it can be seen that the inner chamber energy density has already decayed by more than 10% when the inner chamber pressure is reduced to-50 kpa.
Referring to fig. 4, when the operating temperature of the vacuum ultrasonic cleaning machine is 36 ℃, the energy density of the inner chamber is gradually reduced as the pressure of the inner chamber is gradually reduced, and the energy density of the inner chamber is approximately linearly attenuated when the pressure of the inner chamber is reduced from 0kpa to-70 kpa. After the pressure in the inner chamber is reduced to-70 kpa, the energy density of the inner chamber enters a sudden reduction state, and the sudden reduction amplitude exceeds 20%. Since the inner chamber energy density is a decay trend, 90% of the mean value of the initial inner chamber energy density (referring to the inner chamber energy density at an inner chamber pressure of 0 kpa) corresponding to all the curves in fig. 4 corresponds to the threshold line in fig. 4, so that it can be seen that the decay of the energy density exceeds 10% when the inner chamber pressure is reduced to-75 kpa.
Referring to fig. 5, when the working temperature of the vacuum ultrasonic cleaner is 38 ℃, the energy density of the inner chamber gradually decreases as the pressure of the inner chamber gradually decreases, and the energy density of the inner chamber linearly decreases from 0kpa to-50 kpa. After the pressure in the inner chamber is reduced to-70 kpa, the energy density of the inner chamber enters a sudden reduction state, and the sudden reduction amplitude exceeds 20%. Since the inner chamber energy density is a decay trend, 90% of the mean value of the initial inner chamber energy density (referring to the inner chamber energy density at an inner chamber pressure of 0 kpa) corresponding to all the curves in fig. 5 corresponds to the threshold line in fig. 5, so that it can be seen that the decay of the energy density exceeds 10% when the inner chamber pressure is reduced to-75 kpa. Since the temperature point of 38 ℃ is close to the temperature point of 36 ℃, the curve trend is close to that shown in fig. 4 and 5.
As shown in fig. 6, when the working temperature of the vacuum ultrasonic cleaning machine is 40 ℃, the energy density of the inner chamber is gradually reduced along with the gradual reduction of the pressure of the inner chamber, the energy density of the inner chamber is approximately linearly attenuated in the process of reducing the pressure of the inner chamber from 0kpa to-70 kpa, and after the pressure of the inner chamber is reduced to-70 kpa, the energy density of the inner chamber enters a sudden reduction state, wherein the sudden reduction amplitude exceeds 40%. Since the inner chamber energy density is a decay trend, 90% of the mean value of the initial inner chamber energy density (referring to the inner chamber energy density at the inner chamber pressure of 0 kpa) corresponding to all the curves in fig. 6 corresponds to the threshold line in fig. 6, so that it can be seen that the decay of the energy density exceeds 10% when the inner chamber pressure is reduced to-60 kpa.
Referring to fig. 7, when the working temperature of the vacuum ultrasonic cleaner is 48 ℃, the energy density of the inner chamber gradually decreases as the pressure of the inner chamber gradually decreases, and the energy density of the inner chamber linearly decreases from 0kpa to-50 kpa. After the chamber pressure dropped to-60 kpa, the chamber energy density entered a turbulent regime. Since the inner chamber energy density is a decay trend, 90% of the mean value of the initial inner chamber energy density (referring to the inner chamber energy density at the inner chamber pressure of 0 kpa) corresponding to all the curves in fig. 7 corresponds to the threshold line in fig. 7, so that it can be seen that the inner chamber energy density has decayed by more than 10% when the inner chamber pressure is reduced to-60 kpa.
Referring to fig. 8, when the working temperature of the vacuum ultrasonic cleaning machine is 55 ℃, the inner chamber pressure is gradually decreased from 0kpa to-60 kpa, the inner chamber energy density is gradually decreased and approximately linearly decreased as the inner chamber pressure is gradually decreased, and after the inner chamber pressure is decreased to-60 kpa, the inner chamber energy density enters a climbing state and reaches a peak value at about-80 kpa. By plotting 90% of the mean value of the initial chamber energy density (referring to the chamber energy density at a chamber pressure of 0 kpa) for all curves in fig. 8 against the threshold line of fig. 8, it can be seen that the decay of the energy density is over 10% when the chamber pressure is reduced to-60 kpa, and the chamber energy density is about 1.04 times the initial chamber energy density when the chamber pressure is reduced to-80 kpa.
Referring to fig. 9, when the operating temperature of the vacuum ultrasonic cleaning machine is 60 ℃, the energy density of the inner chamber gradually decreases with the gradual decrease of the pressure of the inner chamber in the process of decreasing the pressure of the inner chamber from 0kpa to-60 kpa, and the energy density of the inner chamber is approximately linearly attenuated, and after the pressure of the inner chamber decreases to-70 kpa, the energy density of the inner chamber enters a fluctuating climbing state, and the pressure of the inner chamber reaches a peak value at about-80 kpa. By plotting 90% of the mean value of the initial chamber energy density (referring to the chamber energy density at a chamber pressure of 0 kpa) for all curves in fig. 9 against the threshold line of fig. 9, it can be seen that the chamber energy density decays by more than 10% when the chamber pressure is reduced to-60 kpa, and the chamber energy density is about 1.07 times the initial energy density when the chamber pressure is reduced to-80 kpa.
As shown in FIG. 10, the working temperature of the vacuum ultrasonic cleaner was 6When the temperature is 5 ℃, the pressure of the inner chamber is reduced to-55 kpa from 0kpa, the energy density of the inner chamber is gradually reduced along with the gradual reduction of the pressure of the inner chamber, the energy density of the inner chamber is approximately linearly attenuated, and after the pressure of the inner chamber is reduced to-70 kpa, the energy density of the inner chamber enters a high-amplitude fluctuation state, wherein the fluctuation center value is 140W/inch 2 . Taking the mean of 90% of the initial chamber energy density (referring to the chamber energy density at a chamber pressure of 0 kpa) for all curves in fig. 10, the threshold line of fig. 10 is plotted, and it can be estimated that the chamber energy density decays by more than 10% when the chamber pressure drops to-30 kpa.
As shown in FIG. 11, which is a graph showing the variation of the energy density of the inner chamber at different temperatures under normal pressure, the temperature point corresponding to the minimum energy density of the inner chamber at a pressure of 0kpa was 48 ℃, and the energy density of the inner chamber was 143.3636W/inch 2 The temperature point of the maximum inner chamber energy density is 60 ℃, and the inner chamber energy density is 143.3636W/inch 2 . The activity range of the cleaning enzyme used in the working process of the vacuum ultrasonic cleaning machine is generally 30-55 ℃, and the energy density of the inner chamber is 138W/inch 2 The fluctuation range is less than 4 percent, so the energy density of the inner chamber is the maximum at the working temperature of 40 ℃, and is 141.5W/inch 2 。
The tables summarized by the data in fig. 3-11 are as follows:
as shown in FIG. 12, the energy density of the inner chamber is very significantly linearly attenuated in the range of-50 kPa to 0kPa regardless of the temperature change of the inner chamber; when the pressure in the inner chamber is lower than-50 kpa, the pressure in the inner chamber generates irregular change direction of the energy density in the inner chamber.
And (4) in the step (6), the abscissa of the pressure and temperature control curve graph in the cleaning stage of the vacuum ultrasonic cleaning machine is the working time of the vacuum ultrasonic cleaning machine, the left ordinate is the temperature range, and the right ordinate is the pressure curve. In the pressure and temperature control curve chart of the vacuum ultrasonic cleaning machine in the cleaning stage, the temperature change curve is drawn by adopting a dotted line, and the pressure change curve is drawn by adopting a solid line, so that the pressure change curve is convenient to distinguish.
The working process of the vacuum ultrasonic cleaning machine in the pressure and temperature control curve chart of the cleaning stage of the vacuum ultrasonic cleaning machine has two temperature rise links. The first heating-up link is to heat up to 40 ℃, because the inner chamber temperature of the washing tank 4 is 40 ℃ and the energy density of the inner chamber of the washing tank 4 is the maximum under the constant pressure state, the best ultrasonic cleaning effect can be obtained, and the second heating-up link is to heat up the cleaning temperature of the inner chamber of the washing tank 4 from 40 ℃ which is most suitable for ultrasonic cleaning to 48 ℃ which is most suitable for pulsating vacuum cleaning after ultrasonic cleaning.
In the pressure and temperature control curve chart of the vacuum ultrasonic cleaning machine in the cleaning stage, the working temperature of the vacuum ultrasonic cleaning machine in the ultrasonic cleaning stage is 40 ℃, and the working pressure is-50 kpa to-20 kpa. In the pressure and temperature control curve chart of the cleaning stage of the vacuum ultrasonic cleaning machine, the temperature point corresponding to the minimum inner chamber energy density when the inner chamber pressure is 0kpa is 48 ℃, and the inner chamber energy density is 143.3636W/inch 2 The temperature point of the maximum inner chamber energy density is 60 ℃, and the inner chamber energy density is 143.3636W/inch 2 . The activity range of the cleaning enzyme used in the working process of the vacuum ultrasonic cleaning machine is generally 30-55 ℃, and the energy density of the inner chamber is 138W/inch 2 Fluctuation up and down, the fluctuation range is less than 4%, when the working temperature is 40 ℃, the energy density of the inner chamber is the maximum, and is 141.5W/inch 2 . Therefore, when the working temperature is 40 ℃ under normal pressure, the ultrasonic cleaning effect of the vacuum ultrasonic cleaning machine is best, but in the ultrasonic cleaning process, in order to prevent air from being dissolved into water secondarily, ultrasonic treatment is carried out under micro negative pressure, and according to a curve graph of the energy density of the inner chamber along with the pressure change of the inner chamber, the energy density of the inner chamber with the pressure ranging from-50 kpa to-20 kpa is not lower than 90% of the maximum energy density of the inner chamber (which means the energy density of the inner chamber with the working temperature of 40 ℃), so that the pressure value of the inner chamber in the ultrasonic cleaning stage of the vacuum ultrasonic cleaning machine can meet the value within the range from-50 kpa to-20 kpa.
As shown in fig. 13, when the initial time of the working process of the vacuum ultrasonic cleaning machine is 0, the vacuum ultrasonic cleaning machine enters a temperature rise link after water is fed, that is, the time period of 0 to t1 is the first temperature rise link in the cleaning tank 4, when the temperature rises to 40 ℃, as can be seen from fig. 11, the energy density of the inner chamber is the maximum when the temperature of the inner chamber is 40 ℃ and the pressure is normal, and the best ultrasonic cleaning effect can be obtained at this time; in order to ensure a good ultrasonic cleaning effect, cleaning water in an inner chamber of the cleaning tank 4 needs to be degassed before ultrasonic cleaning is started, namely, in a first heating link of the cleaning tank 4, a vacuum system is started at a time t0 when the temperature of the inner chamber is close to 40 ℃, air dissolved in the cleaning water can be rapidly removed in a vacuum state, and the good ultrasonic cleaning effect is ensured, wherein a degassing process maintaining time period is t0-t1, and the specific length of the degassing process maintaining time period is determined according to the size of the cleaning tank 4, the vacuumizing capacity of the vacuum system, the heating speed and the like.
t1 to t2 are ultrasonic cleaning processes, and as can be seen from fig. 11, the energy density of the inner chamber is the largest in the normal pressure state when the temperature of the inner chamber is 40 ℃, and ultrasonic cleaning is performed at a slight negative pressure P1 in order to prevent air from being secondarily dissolved into water in the ultrasonic cleaning process, and as can be seen from the summary curve of fig. 12, the attenuation of the energy density of the inner chamber is small in the range of-20 kpa to 0kpa, and therefore P1 can be set to-20 kpa. However, as can be seen from the graphs of the energy density of each inner chamber in fig. 3-10, the energy density of the inner chamber in the range of-50 kpa to-20 kpa is not lower than 90% of the maximum energy density of the inner chamber (i.e. the energy density of the inner chamber at the working temperature of 40 ℃), so that the pressure value of the inner chamber in the ultrasonic cleaning stage of the vacuum ultrasonic cleaning machine can satisfy the range of-50 kpa to-20 kpa.
t 2-t 3 are secondary heating links after the vacuum ultrasonic cleaner is cleaned by ultrasonic waves, and the cleaning temperature in the tank is increased from 40 ℃ which is most suitable for ultrasonic cleaning to 48 ℃ which is most suitable for pulsating vacuum cleaning. And t 3-t 4 are pulse vacuum cleaning links, the outer surface of the piece to be cleaned is cleaned after repeated pulse cleaning, and meanwhile, the pulse vacuum cleaning links can wash the dirt stripped in the ultrasonic cleaning links out of the inner part of the tube cavity of the piece to be cleaned. And a water drainage link after the cleaning stage of the vacuum ultrasonic cleaning machine is finished is arranged after t 4.
Claims (3)
1. A pressure control optimization method for a vacuum ultrasonic cleaning machine is characterized by comprising the following steps: the method comprises the following steps:
(1) the ultrasonic sound intensity tester (1) is arranged on a vacuum ultrasonic cleaning machine;
(2) the ultrasonic sound intensity tester (1) respectively collects a plurality of groups of inner chamber energy densities under different inner chamber pressures at different working temperatures of the vacuum ultrasonic cleaning machine, the working temperatures respectively take certain temperature points within the range of 30-65 ℃, and the inner chamber pressure range is-90-10 kpa;
(3) respectively drawing a plurality of groups of inner chamber energy densities under different inner chamber pressures at different working temperatures to form a curve graph of the inner chamber energy density of each working temperature along with the change of the inner chamber pressure, wherein the abscissa is the inner chamber pressure, and the ordinate is the inner chamber energy density;
(4) drawing a threshold line on an inner chamber energy density variation curve chart of each working temperature along with the inner chamber pressure, wherein the threshold line is a threshold value at the working temperature, which is 90% of the mean value of the energy densities of the plurality of groups of inner chambers when the inner chamber pressure is at 0kpa;
(5) drawing an inner chamber energy density change curve graph at normal pressure at different temperatures, wherein the inner chamber energy density change curve graph is a connecting line of the mean values of the energy densities of the plurality of groups of inner chambers when the pressure of the inner chambers is at 0kpa at each working temperature;
(6) the parameters of the ultrasonic cleaning stage were selected as follows: according to the inner chamber energy density change curve chart in the step (5), the inner chamber energy density is the largest and the cleaning effect is the best when the inner chamber temperature is 40 ℃ and the constant pressure state is realized within the cleaning enzyme activity temperature range of 30-55 ℃, so that 40 ℃ is selected as the cleaning temperature in the ultrasonic cleaning stage; the ultrasonic cleaning stage is carried out under micro negative pressure, and by combining the change curve graph of the inner chamber energy density of each working temperature in the step (4) with the inner chamber pressure, the inner chamber energy density within the range of-50 kpa to-20 kpa is not lower than 90% of the maximum inner chamber energy density, and the maximum inner chamber energy density refers to the inner chamber energy density at the working temperature of 40 ℃, so the inner chamber pressure value of the ultrasonic cleaning stage of the vacuum ultrasonic cleaning machine is set within the range of-50 kpa to-20 kpa;
the cleaning stage of the vacuum ultrasonic cleaning machine is sequentially provided with a heating degassing stage, an ultrasonic cleaning stage, a secondary heating stage and a pulsating vacuum cleaning stage; wherein,
a temperature rise degassing stage: the temperature is increased to 40 ℃ required by the ultrasonic cleaning stage for the first time, and degassing is carried out at the stage;
an ultrasonic cleaning stage: the cleaning temperature is 40 ℃, and the pressure value is a value between-50 kpa and-20 kpa;
a secondary heating stage: heating from 40 ℃ in the ultrasonic cleaning stage to the temperature required in the pulsating vacuum cleaning stage;
a pulsating vacuum cleaning stage: repeatedly performing pulse cleaning for many times;
(7) and (5) drawing a pressure and temperature control curve graph of the cleaning stage of the vacuum ultrasonic cleaning machine according to the step (6), wherein the abscissa of the pressure and temperature control curve graph of the cleaning stage is the working time of the vacuum ultrasonic cleaning machine, the left ordinate is the temperature, and the right ordinate is the pressure.
2. The vacuum ultrasonic cleaner pressure control optimization method according to claim 1, characterized in that: in the step (1), the ultrasonic sound intensity tester (1) is fixed in the middle of the sealing door (2) at the top of the vacuum ultrasonic cleaning machine through the sealing block I (5) and the sealing block II (6).
3. The vacuum ultrasonic cleaner pressure control optimization method according to claim 2, characterized in that: the ultrasonic sound intensity tester (1) penetrates through the middle through hole after the first sealing block (5) and the second sealing block (6) are buckled, and the first sealing block (5) and the second sealing block (6) are fastened through the screw (7).
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