CN110404701A - A kind of control method and device of jet crushing - Google Patents
A kind of control method and device of jet crushing Download PDFInfo
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- CN110404701A CN110404701A CN201910640820.XA CN201910640820A CN110404701A CN 110404701 A CN110404701 A CN 110404701A CN 201910640820 A CN201910640820 A CN 201910640820A CN 110404701 A CN110404701 A CN 110404701A
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
- B05B12/082—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to a condition of the discharged jet or spray, e.g. to jet shape, spray pattern or droplet size
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
- B05B12/085—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to flow or pressure of liquid or other fluent material to be discharged
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
- B05B12/10—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to temperature or viscosity of liquid or other fluent material discharged
Abstract
The invention discloses a kind of control method and device of jet crushing, wherein method includes the following steps: obtaining the target frequency of jet crushing, and the heating frequency of pulse laser is determined according to target frequency；Pulse laser is controlled according to heating frequency to project on the liquid jet outside efflux nozzle, is occurred that liquid jet according to target frequency broken, is obtained multiple drops.This method can be distributed direct regulation and control to jet temperature, to reach the high-precision, high efficiency, Untouched control to jet crushing frequency.
Description
Technical field
The present invention relates to Fluid Jet Technology field, in particular to a kind of control method and device of jet crushing.
Background technique
Liquid jet is usually unstable and can be broken into drop.It is based on this unstability, liquid jet
It is broken to be widely used in the various fields such as jet stream spraying and cleaning, inkjet printing, fuel spray control, medical manufacture.It penetrates
Stream Crushing Problem quantitative study can be traced to 19th century, and directly promote Rayleigh started linearized stability analysis this
Important tool.Theory analysis, numerical simulation and experimental observation for a long time shows that jet crushing is the initial of jet surface
Perturbation wave development causes.Since initial disturbance includes extensive frequency (or wave number), it is final it is broken be these forcing frequencies it
Between vie each other as a result, unless minimum jet stream Reynolds number (one is used to characterize the dimensionless group of jet stream power, is defined as
Effluxvelocity and the product of jet diameter are divided by fluid viscosity coefficient), otherwise it is different all to there is particle size for jet crushing
Drop.One common example is jet atomization, and generated droplet diameter distribution is quite extensive, exists and much is not intended to occur
Larger drop.
In order to control the broken of jet stream and be crushed the particle size of rear drop, there has been proposed the sides using mechanical oscillation
The external disturbance of certain frequency is added on jet stream by method, artificially improves the initial disturbance of this frequency, and it is broken to be allowed to leading jet stream
It is broken, to generate drop of the same size.Typically, vibration frequency is higher, and liquid-drop diameter is smaller after being crushed.Although this machine
Commercialization has been obtained in tool method for oscillating, but there is some limitations for the control method of this mechanical oscillation: being limited by first
The strength of materials, the upper frequency limit of mechanical oscillation usually only have hundreds of hertz, this is also just determined controls drop with this method
The range of size is very limited；Secondly, this method needs at least to vibrate entire nozzle segment together, this can be to device
Safety and stable operation bring difficulty.
In recent years, a kind of that intermittent heat being carried out to nozzle to realize that the method to jet crushing control is mentioned using electric pulse
It comes out.This method is using electric pulse heating nozzle, when jet stream passes through nozzle also by intermittent heat, such moving jet
The temperature height that surface generates compartment is distributed, and the height distribution of the compartment of temperature can promote the compartment of surface tension of liquid
Height is distributed, to induce the Marangoni flowing on exit flow.Specifically, this Marangoni flowing refers in jet stream
While mass motion, the fluid in low surface tension region can flow to the region of high surface tension in jet stream in jet stream, lead to height
Surface tension region expands and low surface tension region then can correspondingly be shunk, to promote the formation of jet crushing and drop.
The Furlani of Kodak has carried out linear instability to such temperature control method and the electric heating hand such as has analyzed and utilize MEMS
Duan Jinhang experiment.But this electrical heating method is indirect contact heating, is realized by heating to nozzle when jet stream passes through
It is out-of-date to touch nozzle inner walls and be heated.This mode inevitably encounters heat lag, thermal inertia and thermal diffusion etc. one
Series of problems.These problems can all influence the construction effect being spaced apart on jet temperature and further influence to jet crushing
Control effect, especially when needing higher modulation frequency.
Summary of the invention
The present invention is directed to solve one of the problems in the relevant technologies at least to a certain extent.
For this purpose, an object of the present invention is to provide a kind of control methods of jet crushing.
It is another object of the present invention to the control devices for proposing a kind of jet crushing.
In order to achieve the above objectives, one aspect of the present invention proposes the control method of jet crushing, comprising the following steps: obtains
The target frequency of jet crushing, and determine according to the target frequency heating frequency of pulse laser；According to the heating frequency
It controls on the liquid jet that the pulse laser projects outside efflux nozzle, sends out the liquid jet according to the target frequency
It is raw broken, obtain multiple drops.
The control method of the jet crushing of the embodiment of the present invention can be distributed direct regulation and control to jet temperature, and make jet stream
The temperature height distribution on surface becomes apparent, to reach the high-precision to jet crushing frequency, high efficiency, contactless control
System, meanwhile, there is very high control upper frequency limit, the only limitation of stimulated light device pulse frequency using laser method for heating and controlling.
In addition, the control method of jet crushing according to the above embodiment of the present invention can also have following additional technology
Feature:
Further, in one embodiment of the invention, further includes: receive regulating command；According to the regulating command
Adjust the heating frequency.
Further, in one embodiment of the invention, the pulse laser is Dan Shu or multi beam.
Further, in one embodiment of the invention, the partial size of the multiple drop is equal, and is evenly distributed.
Further, in one embodiment of the invention, the grain as also needed to generate drop after quantitative control jet crushing
Diameter, spacing distance, movement velocity and liquid jet breaking length, further includes: obtain target grain size, the mesh of the multiple drop
Mark the target breaking length of spacing distance, target speed and the liquid jet；According to the target grain size, the target
Spacing distance, the target speed and the target breaking length adjust the frequency of the pulse laser, efflux nozzle
Size and/or jet flow.
Further, in one embodiment of the invention, further includes: detect the multiple drop current partial size, when
The current breaking length of space before distance, current kinetic speed and/or the liquid jet；If the current partial size, it is current between
Gauge meets alert if from, current kinetic speed and/or current breaking length, then generates alarm signal and alarm, and adjust
Save laser heating frequency and/or jet flow.
In order to achieve the above objectives, another aspect of the present invention proposes a kind of control device of jet crushing, comprising: obtains mould
Block for obtaining the target frequency of jet crushing, and determines according to the target frequency heating frequency of pulse laser；Projective module
Block projects liquid jet outside efflux nozzle for controlling the pulse laser according to the heating frequency, makes the liquid
Body jet stream occurs to be crushed according to the target frequency, obtains multiple drops.
The control device of the jet crushing of the embodiment of the present invention can be distributed direct regulation and control to jet temperature, and make jet stream
The temperature height distribution on surface becomes apparent, to reach the high-precision to jet crushing frequency, high efficiency, contactless control
System, meanwhile, there is very high control upper frequency limit, the only limitation of stimulated light device pulse frequency using laser method for heating and controlling.
In addition, the control device of jet crushing according to the above embodiment of the present invention can also have following additional technology
Feature:
Further, in one embodiment of the invention, the partial size of the multiple drop is equal, and is evenly distributed.
Further, in one embodiment of the invention, further includes: acquiring unit, for obtaining for the multiple drop
Take the target breaking length of target grain size, target interval distance, target speed and the liquid jet；Unit is adjusted, is used
According to the target grain size, target interval distance, the target speed and target breaking length adjusting institute
State the frequency of pulse laser, the size of efflux nozzle and/or jet flow.
Further, in one embodiment of the invention, further includes: detection unit, the inspection for the multiple drop
Survey current partial size, present interval distance, current kinetic speed and/or current breaking length；Alarm unit, if for described current
Partial size, present interval distance, current kinetic speed and/or the liquid jet current breaking length meet alert if, then
It generates alarm signal to alarm, and feeds back to adjusting unit and control is adjusted.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, in which:
Fig. 1 is the control method flow chart of the jet crushing of one embodiment of the invention；
Fig. 2 is the pulsed laser heating control jet crushing method implementation procedure schematic diagram of one embodiment of the invention；
Fig. 3 is 4000Hz pulse laser control jet crushing effect picture；
Fig. 4 is 5500Hz pulse laser control jet crushing effect picture；
Fig. 5 is the controling device structure diagram of the jet crushing of one embodiment of the invention.
Specific embodiment
The embodiment of the present invention is described below in detail, the example of embodiment is shown in the accompanying drawings, wherein identical from beginning to end
Or similar label indicates same or similar element or element with the same or similar functions.It is retouched below with reference to attached drawing
The embodiment stated is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
The control method and device of the jet crushing proposed according to embodiments of the present invention are described with reference to the accompanying drawings, first will
Describe the control method of the jet crushing proposed according to embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is the control method flow chart of the jet crushing of one embodiment of the invention.
As shown in Figure 1, the control method of the jet crushing the following steps are included:
In step s101, the target frequency of jet crushing is obtained, and determines the heating of pulse laser according to target frequency
Frequency.
Further, the embodiment of the invention also includes: receive regulating command；Heating frequency is adjusted according to regulating command.
That is, the embodiment of the present invention receives the regulating command of operator, pulse is swashed according to the regulating command
The heating frequency of light is adjusted.
In step s 102, pulse laser is controlled according to heating frequency to project on the liquid jet outside efflux nozzle, make
Liquid jet occurs to be crushed according to target frequency, obtains multiple drops.
Further, in one embodiment of the invention, the partial size of multiple drops is equal, and is evenly distributed.
Further, it is penetrated if you need to liquid-drop diameter, spacing distance, movement velocity and liquid after quantitative control jet crushing
The breaking length of stream, the embodiment of the invention also includes: obtain the target grain size, target interval distance, target movement of multiple drops
The target breaking length of speed and liquid jet；It is broken according to target grain size, target interval distance, target speed and target
The frequency of length adjustment pulse laser, the size of efflux nozzle and/or jet flow.
That is, after getting the partial size of target, spacing distance, movement velocity and breaking length, according to target data
Frequency, the size of efflux nozzle and/or the jet flow of pulse laser are adjusted, efflux nozzle ejects and expected partial size in turn
Multiple drops that are equal and being evenly distributed.
Further, the embodiment of the invention also includes: detect the current partial size of multiple drops, present interval distance, current
The current breaking length of movement velocity and/or liquid jet；If current partial size, present interval distance, current kinetic speed and/or
Current breaking length meets alert if, then generates alarm signal and alarm.
That is, to avoid the occurrence of unexpected situation, when detecting that current data have been unsatisfactory for target call, namely
When current all data meets alert if, operator is then make an alarm reminder, and carry out feedback control.
Specifically, as shown in Fig. 2, a branch of or multi beam pulse laser is projected the liquid outside spout by the embodiment of the present invention
On body jet stream, the frequency by adjusting pulse laser can realize the control of jet crushing, to obtain a series of partial size phases
Deng, the fine droplet that is evenly distributed.In certain frequency-tuning range, the frequency of jet crushing and the frequency of pulsed laser heating
Rate is complete frequency locking, and the control frequency is continuously adjustable.According to the basic physics side such as the conservation of mass and the conservation of momentum
Journey, the embodiment of the present invention can pass through the parameters such as the flow of the frequency of change pulse laser, the size of efflux nozzle and jet stream
Accurately to control particle size, spacing distance, movement velocity and the liquid of a series of fine droplets generated after jet crushing
The breaking length of jet stream.
As shown in Figures 3 and 4, work as pulse laser under same flow and jet size it can be seen from working effect figure
Frequency it is higher, then partial size and the spacing distance of a series of fine droplets obtained can be smaller, and these physical quantitys are
It can accurately be controlled by selecting jet parameters and laser pulse frequency in advance.
In addition, the features such as being based on above-mentioned function and its high-precision, high efficiency, untouchable, high control upper frequency limit, this
Inventive embodiments can also be the development band in the fields such as jet stream spraying and cleaning, inkjet printing, fuel spray control, medical manufacture
Carry out very big help.
To sum up, the control method of the jet crushing proposed according to embodiments of the present invention can pass through the frequency of pulse laser
The frequency of jet crushing is controlled, to obtain a series of fine droplet that partial sizes are equal, are evenly distributed, and can be by changing
Become the frequency of pulse laser, the size of efflux nozzle and jet stream flow come accurate quantification control fine droplet partial size it is big
The breaking length of small, spacing distance, movement velocity and liquid jet.
Referring next to the control device for the jet crushing that attached drawing description proposes according to embodiments of the present invention.
Fig. 5 is the control method structural schematic diagram of the jet crushing of one embodiment of the invention.
As shown in figure 5, the control device 10 of the jet crushing includes: to obtain module 100 and projection module 200.
Wherein, the target frequency that module 100 is used to obtain jet crushing is obtained, and pulse is determined according to the target frequency
The heating frequency of laser.Projection module 200, which is used to control pulse laser according to heating frequency, projects the liquid outside efflux nozzle
On jet stream, occurs that liquid jet according to target frequency broken, obtain multiple drops.
Further, in one embodiment of the invention, the partial size of multiple drops is equal, and is evenly distributed.
Optionally, the embodiment of the invention also includes acquisition target grain size, target intervals that: acquiring unit is used for multiple drops
The target breaking length of distance, target speed and liquid jet；Adjust unit be used for according to target grain size, target interval away from
From frequency, the size of efflux nozzle and/or the jet flow that, target speed and target breaking length adjust pulse laser.
Wherein, the embodiment of the invention also includes: multiple drops of detection unit for detect current partial size, present interval away from
From, current kinetic speed and/or current breaking length.If alarm unit is used for current partial size, present interval distance, current kinetic
The current breaking length of speed and/or liquid jet meets alert if, then generates alarm signal and alarm.
It should be noted that the explanation of the aforementioned control method embodiment to jet crushing is also applied for the device,
Details are not described herein again.
The control device of the jet crushing proposed according to embodiments of the present invention can be controlled by the frequency of pulse laser
The frequency of jet crushing, to obtain a series of fine droplet that partial sizes are equal, are evenly distributed, and can be by changing pulse
The flow of the frequency of laser, the size of efflux nozzle and jet stream comes the particle size of accurate quantification control fine droplet, interval
The breaking length of distance, movement velocity and liquid jet.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. a kind of control method of jet crushing, which comprises the following steps:
The target frequency of jet crushing is obtained, and determines the heating frequency of pulse laser according to the target frequency；
It is controlled according to the heating frequency on the liquid jet that the pulse laser projects outside efflux nozzle, penetrates the liquid
Stream occurs to be crushed according to the target frequency, obtains multiple drops.
2. the method according to claim 1, wherein further include:
Receive regulating command；
The heating frequency is adjusted according to the regulating command.
3. the method according to claim 1, wherein the pulse laser is Dan Shu or multi beam.
4. the method according to claim 1, wherein the partial size of the multiple drop is equal, and being evenly distributed.
5. according to the method described in claim 4, it is characterized by further comprising:
Obtain target grain size, the target interval distance, the target of target speed and the liquid jet of the multiple drop
Breaking length；
It is adjusted according to the target grain size, target interval distance, the target speed and the target breaking length
The frequency of the pulse laser, the size of efflux nozzle and/or jet flow.
6. according to the method described in claim 5, it is characterized by further comprising:
Detect the current partial size of the multiple drop, present interval distance, current kinetic speed and/or the liquid jet are worked as
Preceding breaking length；
If the current partial size, present interval distance, current kinetic speed and/or current breaking length meet alert if,
Alarm signal is generated to alarm.
7. a kind of control device of jet crushing characterized by comprising
Module is obtained, for obtaining the target frequency of jet crushing, and determines according to the target frequency heating of pulse laser
Frequency；
Projection module projects liquid jet outside efflux nozzle for controlling the pulse laser according to the heating frequency
On, occur that the liquid jet according to the target frequency broken, obtains multiple drops.
8. device according to claim 7, which is characterized in that the partial size of the multiple drop is equal, and is evenly distributed.
9. device according to claim 8, which is characterized in that the projection module further include:
Acquiring unit, for the acquisition target grain size of the multiple drop, target interval distance, target speed and the liquid
The target breaking length of body jet stream；
Unit is adjusted, for according to the target grain size, target interval distance, the target speed and the target
Breaking length adjusts the frequency of the pulse laser, the size of efflux nozzle and/or jet flow.
10. device according to claim 9, which is characterized in that further include:
Detection unit, the current partial size of detection for the multiple drop, present interval distance, current kinetic speed and/or works as
Preceding breaking length；
Alarm unit, if for the current partial size, present interval distance, current kinetic speed and/or the liquid jet
Current breaking length meets alert if, then generates alarm signal and alarm.
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| CN201910640820.XA CN110404701A (en) | 2019-07-16 | 2019-07-16 | A kind of control method and device of jet crushing |
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| CN201910640820.XA CN110404701A (en) | 2019-07-16 | 2019-07-16 | A kind of control method and device of jet crushing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112844895A (en) * | 2021-01-03 | 2021-05-28 | 清华大学 | Device for controlling liquid jet flow crushing |
| CN115464570A (en) * | 2022-08-12 | 2022-12-13 | 武汉大学 | Laser cutting type pulse jet generating device |
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| CN101275164A (en) * | 2007-03-30 | 2008-10-01 | 株式会社日立制作所 | Method and apparatus for sample preparation |
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| CN112844895A (en) * | 2021-01-03 | 2021-05-28 | 清华大学 | Device for controlling liquid jet flow crushing |
| CN115464570A (en) * | 2022-08-12 | 2022-12-13 | 武汉大学 | Laser cutting type pulse jet generating device |
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