CN1048913A - Electric drip jet generator and adjusting method thereof - Google Patents
Electric drip jet generator and adjusting method thereof Download PDFInfo
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- CN1048913A CN1048913A CN 89104825 CN89104825A CN1048913A CN 1048913 A CN1048913 A CN 1048913A CN 89104825 CN89104825 CN 89104825 CN 89104825 A CN89104825 A CN 89104825A CN 1048913 A CN1048913 A CN 1048913A
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Abstract
Electric drip jet generator comprises a supporting element (1) and sparger (2), working liquid body is sent in the sparger under pressure, and the pressure pulsation of the interior liquid of sparger (2) is to utilize by spring (10) to be pressed on piezoelectric constant disk (7) generation between the flange (4) of supporting element (1) and sparger (2).The adjusting method of generator comprises that the most effective operating conditions of collateral security generator sets out, for good conductivity with electric conductivity a little less than the impacting force of working liquid body selector disc (7), the frequency of okperation of working pressure and pressure pulsation.
Description
The invention belongs to liquid jet and form device, promptly belong to electric drip jet generator and adjusting method thereof: the present invention can be used for printer, marking device and little ingredients amount and prilling granulator.
Electric drip jet generator is used to produce the working solution drip that is used to make symbol or figure on base plate, or is used to obtain the little dosage of regulation or because the solid particle that droplet solidification produces of liquid.Liquid fluently produces with sparger, and working liquid body flows in the sparger under pressure.Sparger has a nozzle, and from a certain distance of nozzle, when after the sparger ejection, liquid stream is separated into many independent drops.For the drip that obtains side by side to advance successively, along forming pressure pulsation in the sparger liquid flow flowing with certain frequency.These pulsation generally are to utilize the piezoelectric element that is installed on the sparger to produce.Add electric signal on the electrode of piezoelectric element, piezoelectric element is stretched in turn and is compressed as a result, causes the corresponding deformation of sparger, and this distortion just makes along producing pressure pulsation in the sparger flowing liquid.These pulsation cause the increase that liquid flow velocity takes turns and reduce, and this just makes jet after the sparger ejection, is splitting into many drops on one of nozzle little distance.Drop with the fluid pressure ripple frequency, thereby also be to be added in the frequency that the signal frequency on the piezoelectric element electrodes equates side by side to advance successively.
When in printer and marking device, using electric drip jet generator, drop on certain place of base plate in order to guarantee drop, drop is after the nozzle ejection, by a charging unit.Like this, drop just obtains electric charge, and its size is decided by to be added in the size that reaches the voltage that changes according to certain rules on the charging unit.Then, charged drop falls into by two that the are added with constant voltage dull and stereotyped steady electric fields of forming.In electric field, charged drop departs from the path several angle of himself, and this angular dimension is dropped on the base plate by the size decision ， And of drop electric charge, forms symbol, pattern etc.
Known a kind of electric drip jet generator (U. S. Patent 3512172), it includes a supporting element and is installed in the sparger that supporting element Shang And makes the pipe form, and pipe is equipped with nozzle at the one end, has flange at the other end.Between flange and supporting element,, piezoelectric element is installed longitudinally on pipe for pipe is passed in vibration.Generator also is equipped with the device that is pressed on the piezoelectric element between pipe flange and the supporting element, and these devices have a nut that surrounds pipe.Nut and pipe have thread engagement to concern that ， And is in an end of supporting element, and piezoelectric element then is in the other end of supporting element.Electrode is installed between piezoelectric element, and it is connected with voltage source.
When adding alternating voltage on electrode, piezoelectric element produces corresponding distortion.At this moment, the power that is produced is passed on pipe flange and the supporting element, makes a part of pipe between flange and supporting element produce distortion.This part pipe stretches successively and compresses according to the power that piezoelectric element produced, and makes along producing pressure pulsation in the sparger flowing liquid.In order to guarantee the stretching that pipe is enough, piezoelectric element should produce sizable power, just this power only can obtain the bigger energy of needs when this just causes this generator to be worked under the relatively large condition of voltage magnitude.This generator is difficult to obtain the large amplitude of fluid pressure pulsation in the sparger, because need to guarantee sizable tensile force of sparger like this, and this possibility just when having only voltage when being added in piezoelectric element on big.Voltage on the piezoelectric element means greatly has big electric current by piezoelectric element, and this can make it send out And hot may lose piezoelectric effect.In addition, the possibility of piezoelectric element generation great force also is subjected to the restriction of its mechanical strength limit.Owing in this generator, only may produce less relatively fluid pressure pulse amplitude, so the selection of working liquid body form is very restricted.In addition, less relatively fluid pressure pulse amplitude can not change the working diameter of nozzle in the scope of broadness.
When using electric drip jet generator in printer and marking device, the peak frequency that drop generates is subjected to realizing the restriction of drop charge time necessary.Duration of charge increases along with the reduction of the increase of the distance in the place that splits into drop from the sparger nozzle to the jet by the ejection of this sparger and liquid conduction.The fluid pressure pulse amplitude is less relatively in the sparger has determined that the distance between sparger nozzle and the jet division place is bigger, thereby has just limited the frequency ， And that drop generates and reduced print speed printing speed, and it is impossible to make that the working liquid body that utilizes poorly conductive becomes.
Adjusting method (the B. P. of known a kind of electric drip jet generator, A, 1347148), it comprises the flange that compresses the generator sparger and the piezoelectric element between the supporting element, under pressure working liquid body is delivered in the sparger and with alternating voltage to be added on the piezoelectric element so that produce the pressure pulsation of working liquid body in sparger.When adjusting electric drip jet generator, change the electric voltage frequency that is added on the piezoelectric element, decision sparger nozzle and the jet that sprays from sparger split into will determine electric voltage frequency on the piezoelectric element apart from And between the place of drop, usually the resonance value of this frequency when to equal above-mentioned distance be minimum changes frequency in any direction above-mentioned distance is increased under this resonance value.The compressing of piezoelectric element should guarantee between piezoelectric element and sparger flange to being rigidly connected, promptly piezoelectric element use each other one very big defeat tight so that sparger can not move relative to supporting element.
Generator is adjusted to resonant frequency generator is worked most effectively, promptly under the condition of given piezoelectric element voltage magnitude, can guarantee the amplitude maximum of working liquid pressure pulsation in the sparger.In addition, under resonant frequency, the distance between sparger nozzle and the jet split point is reduced, as mentioned above, this may improve the frequency of okperation of generator, promptly improve its snap action.
Because when adjusting electric drip jet generator according to known method, at piezoelectric element, for being rigidly connected, so this method can not guarantee that the pressure pulsation of liquid has big amplitude in sparger between sparger flange and the supporting element.As mentioned above, the selection ， And of this meeting restraint of labour liquid form and sparger nozzle working diameter reduces the frequency values of the maximum possible of drop generation.
Basic task of the present invention is to found a kind of electric drip jet generator, its method that is pressed on the piezoelectric element between sparger flange and the supporting element guarantees and can not increase under the condition that is added in the voltage on the piezoelectric element, the pressure pulsation And that improves liquid in the sparger sets up a kind of method of adjusting electric drip jet generator, when making in this way, compress the power of piezoelectric element, the electric voltage frequency and the working liquid pressure that are added on the piezoelectric element are selected to such an extent that can guarantee that at the voltage magnitude on the piezoelectric element be under the minimum condition of minimum and working liquid pressure, generator can be worked effectively and reliably, thereby can improve the snap action of generator, the consumption ， And that reduces the demand of energy and working liquid body can enlarge the working liquid body that adopted and the scope of sparger nozzle diameter.
Being proposed of task is to solve like this: we have proposed a kind of electric drip jet generator, it comprises a supporting element, one is installed in the sparger that supporting element Zhong And has the pipe form, one end of pipe is equipped with nozzle, the other end has flange, it also includes and is installed between flange and the supporting element, extensional vibration is passed to the piezoelectric element of pipe and the device that compresses piezoelectric element between the flange of pipe and supporting element, this device has a nut that surrounds pipe, according to the present invention, pipe is mounted to supporting element relatively compresses piezoelectric element vertically moving device and includes a spring, it surrounds pipe, has elasticity on the y direction of pipe.And and being installed between the part and above-mentioned nut of one of two elements, one of them element is a supporting element, and another is a pipe, above-mentioned nut then with above-mentioned two elements in another element the thread engagement relation is arranged.
When the work of this generator, utilize power that the piezoelectric element distortion produced longitudinally oscillating movement pass to sparger, this than in many known structure for making the sparger pipe required power that stretches much smaller.This can obtain the relatively large amplitude of fluid pressure pulsation in sparger being added under the less relatively condition of voltage on the piezoelectric element, the energy consumption when this can reduce this generator work.
Because can obtain bigger sparger vibration amplitude under less relatively voltage, so the temperature of generator when work piezoelectric element raises lessly, and this also can increase the amplitude of liquid pulsation in the sparger.The possibility that guarantees big pressure pulsation makes might utilize the working liquid body with various different physical properties, comprises that the less and bigger liquid ， And of viscosity of surface tension coefficient might change the working diameter of nozzle in the scope of broadness.
Can reduce by the slow distance that is split into the place of drop to jet in sparger limit by the method that increases the fluid pressure pulse amplitude, this just might use the weak working liquid body ， And of electric conductivity and can improve the frequency of okperation that drop generates when using the liquid of good conductivity.Higher frequency of okperation means that printing or the marking device print speed printing speed of using generator are higher.
In one embodiment of the invention, nut and pipe have the thread engagement relation.Like this, spring is installed between the end of nut and supporting element, and piezoelectric element and flange are installed in the other end of supporting element.
In another embodiment of the invention, spring is installed between flange and the nut.The part of nut and supporting element has the thread engagement relation, and flange and garden dish are installed between another part of spring and supporting element.
Being proposed of task also can solve like this: we have proposed a kind of method of adjusting electric drip jet generator, it comprises the piezoelectric element that is pressed between sparger flange and the fastener, under pressure working liquid body is delivered in the sparger, adding alternating voltage on the piezoelectric element so that in sparger, produce the working liquid pressure pulsation, change the electric voltage frequency that is added on the piezoelectric element, decision sparger nozzle and the jet that sprays from this sparger split into distance between the place of drop and the frequency of adjusting above-mentioned voltage, make it equal resonance value, under the frequency of resonance value, changing electric voltage frequency in any direction all can make above-mentioned distance increase, according to the present invention, in the method, compressing of piezoelectric element between sparger flange and the fastener can realize by elastic element, the big or small And that can change the piezoelectric element impacting force determines the impacting force of such size, feasible reducing along with above-mentioned power, sparger nozzle and the distance that splits into from the jet of sparger ejection between the place of drop increase, and along with the increase of above-mentioned power or above-mentioned amplitude, the distance that sparger nozzle and jet split between the place of drop remains unchanged.
This adjusting method of the electric drip jet generator of the structure of advising can guarantee reliable sound the contacting between the piezoelectric element that mutually is connected and the sparger flange; And can make sparger do very big moving relative to fastener simultaneously; And can also excessively not increase under the situation of the amplitude that is added in the alternating voltage on the piezoelectric element, make sparger nozzle and jet divide between the place apart from minimum.
Can guarantee that like this voltage magnitude on piezoelectric element is minimum, i.e. energy consumption can effectively and reliably be worked for generator under the minimum condition.
Utilize elastic element to compress piezoelectric element and just determined to exist several resonant frequencies along the pressure pulsation of sparger flowing liquid.As noted before, resonant frequency is interpreted as such pressure pulsation frequency, and when changing it big or small in any direction, the distance between sparger nozzle and the jet division place increases.
When using the working liquid body of good conductivity,, should adjust electric drip jet generator in the following manner in order to select the optimum value of frequency and pressure.At first under working liquid body maximum allowble pressure condition, change the electric voltage frequency that is added on the piezoelectric element, under this pressure, decision splits into the frequency maximum limit of drop from the jet of sparger ejection, from many frequency values, determine the working value of a maximum value as frequency, under this numerical value, the size that changes frequency in any direction all can make the sparger nozzle and the distance that splits into from the jet of sparger ejection between the place of drop increases, this frequency maximum value is than the little amount of above-mentioned maximum limit, this amount should surpass a regulation numerical value of selecting in 30%～40% scope of above-mentioned greatest limit frequency values, determine the frequency of voltage, this frequency surpasses amount of working value of said frequencies, this amount is one of percentage of determining frequency, this share just under maximum allowble pressure above-mentioned selected regulation numerical value account for the share of greatest limit frequency, before stopping to be split into drop, the jet from the sparger ejection reduces the pressure of working liquid body, after this, adjust electric voltage frequency, make it to equal the above-mentioned working value of frequency.
This method can guarantee to work under the peak frequency of generator in can guaranteeing effective and reliable drop generated frequency.Because like this, when using it in printing and marking device, can make the snap action raising of generator, print speed printing speed increases.In addition, this adjusting method can make pressure be transferred to bottom line, thereby also is to make the consumption of working liquid body reach minimum.
During according to the working liquid body a little less than using electric conductivity, realize another program of generator adjusting method, the supply of working liquid body can be carried out under minimum authorized pressure, and electric voltage frequency should be adjusted to the value that equals a minimum in the resonance frequency value.
Although the method for this selection electric voltage frequency and pressure can reduce from sparger nozzle to jet split into drop the place weak inductive liquid jet length And and can increase the resistance of working liquid body, the cycle that this method can also make drop generate is increased to the numerical value that can make drop obtain necessary electric charge.
Below, the present invention will explain with its embodiment And quoted figures, wherein:
Fig. 1 represents the longitudinal section of the electric drip jet generator of making according to the present invention;
Fig. 2 represents the longitudinal section of the electric drip jet generator of making according to another embodiment of the invention;
Fig. 3 represents the frequency characteristic of the electric drip jet generator of making according to the present invention;
Fig. 4 represents impacting force and splits into relation between the distance in place of drop from generator sparger nozzle to the jet by the ejection of this sparger.
According to Fig. 1, electric drip jet generator comprises a supporting element 1 and a sparger that makes pipe 2 forms, and pipe 2 is equipped with nozzle 3 at the one end, and at its other end flange 4 is housed.Pipe 2 has screw thread ， And to be installed in the hole of supporting element 1 with nozzle 3 relative ends, and supporting element is moving axially relatively.The threaded end of pipe 2 is connected by the pipeline 6 of pipe joint 5 with transportation work liquid under pressure.
On pipe 2, between flange 4 and supporting element 1, be installed with by piezoelectric material from an end and make, And coils in the garden of making the piezoelectric element of 7 forms, and its effect is that pipe 2 is passed in extensional vibration.Between garden dish 7, electrode 8 is installed, is connected to each other on the output terminal of it and electric signal source (not illustrating among the figure) is electric, be connected to each other on another output terminal of electrode and the pipe of sparger 2 are electric.The device of the garden dish 7 between supported flange 4 and the supporting element 1 is installed at the other end of supporting element 1.
Said apparatus comprises a nut 9, and it surrounds the pipe 2 of sparger, and the screw tip Shang And and the pipe that are installed in pipe 2 have the thread engagement relation.The hold down gag of garden dish 7 also comprises a butterfly spring 10 that is installed between nut 9 and the supporting element 1.Spring 10 surrounds pipe 2 ， And and has elasticity at its y direction.
In the outside of nozzle 3, along stroke the charging electrode 11 of a garden cylindricality is installed from the liquid jet of sparger ejection, it links with the voltage source (not shown) that changes.In ionization electrode 11 a certain distances two tilt flat plates 12 that are connected with constant voltage source (not illustrating among the figure) are installed.When using electric drip jet generator to print or during marking, put a piece of paper or other base plate in tilt flat plate 12 outsides, or want the product (not illustrating among the figure) of marking, drop on above-mentioned paper or base plate behind the electric field that drop produces by charging electrode 11 and tilt flat plate 12 or want on the product of marking.When electric drip jet generator being used for granulation process or little ingredients amount process,, and use the corresponding container that receives drop without paper or other base plate.Installing electrodes 11 and dull and stereotyped 12 not in this case.
Fig. 2 represents the electric drip jet generator of making according to another embodiment of the invention.According to Fig. 2, generator comprises a supporting element that makes garden cylindrical cup 13 forms, 13a and wall of cup 13B at the bottom of it has glass.Sparger makes the form of pipe 14, and its end is equipped with nozzle 15, and the other end is equipped with flange 16.Pipe 14 is installed in the hole of cup end 13a of cup 13, can be relatively a glass end moving axially.On the pipe 14 that piezoelectricity garden dish 17 is installed in the cup 13, between the cup end 13a of flange 16 in being in cup 13 equally and cup 13.Between the outer surface of the internal surface of wall of cup 13B and garden dish 17 and flange 16, the sleeve of being made by insulating material 18 is installed.
Pipe 14 and nozzle 15 relative ends reach outside the cup end 13a of cup 13 ， And and are connected with the pipeline 20 of transportation work liquid under pressure by pipe joint 19.The hold down gag of the garden dish 17 between the cup end 13a of flange 16 and cup 13 comprises a nut 21, and its bag encloses pipe 14 And and is positioned at cup 13.On the outer surface of nut 21, make to have screw thread, it and the thread engagement of work on the internal surface of the wall of cup 13B of cup 13.The hold down gag of garden dish 17 also comprises a planar spring 22, and it surrounds pipe 14, pacifies model ， And and have elasticity at the y direction of pipe 14 between nut 21 and flange 16.Flange 16 and garden dish 17 are between the cup end 13a of spring 22 and cup 13.Between garden dish 17 electrode 23 is installed, it interconnects on electric by the hole on wall of cup 13B and sleeve 18 and ac signal (not illustrating among the figure).When using generator to print with marking, install in nozzle 15 outsides of pipe 14 one with electrode 11 similar charging electrodes shown in Figure 1, and be similar to the tilt flat plate of flat board shown in Figure 1 12 in a certain distance installation of ionization electrode.Also can use other forms of spring, for example the garden cylindrical spring replaces spring illustrated in figures 1 and 2 10 and 22.
When electric drip jet generator was worked, working liquid body was sent into (Fig. 1) in the generator that assembles along pipeline 6 under pressure, and is added with alternating voltage on electrode 8.When utilizing generator to print or during marking, on charging electrode 11, be added with the VDC that changes according to certain rules, and on tilt flat plate 12, be added with constant voltage to produce steady electric field.When alternating voltage was added on the electrode 8, garden dish 7 bore in turn to stretch and compress ， And and acts on flange 4 and the supporting element 1.Simultaneously, pipe 2 is axially moving with respect to supporting element 1, makes spring 10 produce distortion.When pressure elements 7 stretched, the resistance that pipe overcomes spring 10 moved, and the distance between supporting element 1 and the flange 4 is increased slightly.When piezoelectric element 7 compressions, spring 10 reverse mobile pipes 2 reduce the distance between supporting element 1 and the flange 4 a little.As a result, pipe 2 is vertically being made oscillating movement, along producing pressure pulsation in the sparger flowing liquid.These pulsation cause acceleration and the deceleration in turn of working solution stream, make jet split into drop 24 side by side simultaneously after nozzle 3 ejections, advance with the frequency that equals to be added in the electrical signal on the electrode 8.It is to carry out on the distance of L at distance nozzle 3 that jet splits into drop 24, as shown in Figure 1, the amplitude of sparger vibration, thereby also be the amount of deformation that the amplitude of fluid pressure pulsation in the sparger depends on piezoelectric element 7, this amount of deformation is directly proportional with voltage magnitude on being added in piezoelectric element.Needed power is much smaller because the needed force rate sparger of spring 10 distortion stretches, and usually this stretching can take place in the known structure of not using spring, and therefore the generator of the structure of advising can be worked much more effectively.Promptly be added under the less relatively condition of voltage on the piezoelectric element 7, can obtaining relatively large fluid pressure pulsation, the power consumption when this can reduce generator work.On the other hand, when the voltage on being added to piezoelectric element was no more than tolerance limit, generator was more effectively worked and can obtain much bigger fluid pressure pulsation in sparger.
In the moment that breaks away from jet, owing to be added in the effect of the voltage on the charging electrode 11, drop obtains certain electric charge.The size of this electric charge is by being added in the voltage decision ， And on the electrode 11 and changing synchronously with the generation of drop.By by the dull and stereotyped 12 steady electric field ， And that produce and depart from its path several angle, this angular dimension is by the electric charge decision of drop after the drop 24 of charging.According to the difference of deviation angle, drop 24 drops on the base plate somewhere, promptly on the base plate position of drop finally by the voltage swing decision that is added on the charging electrode 11.Like this, drop forms symbol, pattern etc. on base plate.
The time that drop 24 obtains necessary electric charge is decided by to split into the distance L in place of drop and the unit resistance of working liquid body to the jet by nozzle 3 ejections from the nozzle 3 of sparger.The more little and liquid conduction of distance L is high more, and then drop can obtain needed electric charge more soon, thereby the frequency of okperation of generator and snap action thereof are just high more.
Owing in the generator of being advised, can guarantee sizable pressure pulsation, therefore can do very for a short time from sparger nozzle to the distance L that divides the place, so just can reduce the time constant of drop charge.This just might adopt the working liquid body with very big unit resistance when generator is worked because even under big resistance situation, drop also has enough time to obtain needed electric charge.In addition, the possibility that can access the pulsation of bigger fluid pressure makes might be with viscous liquid, and the less liquid of surface tension coefficient splits into drop.In the generator of being advised, can use like this some viscosity and liquid poorly conductive, for example oily pigment and nitro dye.
Obtain to guarantee working liquid body is split into drop under can also be at the diameter of the nozzle 3 bigger situation of the possibility of bigger fluid pressure pulsation.This may change the diameter of sparger nozzle simultaneously again in the scope of broadness.
Electric drip jet generator shown in Figure 2 can be worked by similar mode, has only a bit and makes an exception, and promptly when it stretched, piezoelectric element 17 acted on the cup end 13a of flange 16 and cup 13, makes pipe 14 axially produce mobile with respect to cup 13 like this.Simultaneously, pipe 14 makes spring 22 distortion, when piezoelectric element 17 compressions, and spring 22 reverse mobile pipes 14.
When using the liquid of good conductivity, at first can adjust electric drip jet generator sending under the working liquid body maximum allowble pressure of sparger.The size of this pressure is by the mechanical strength decision of generator part.Be in course of adjustment, need decision to split into the distance L (Fig. 1) in the place of drop and be added in relation between the electric voltage frequency on the piezoelectric element 7 from sparger nozzle 3 to jet.Distance L can decide by naked eyes, for example by stroboscopic observation fitting device and microscope.
In sparger under the various pressure condition of liquid, distance L and the relation that is added in the electric voltage frequency f on the piezoelectric element as shown in Figure 3, horizontal axis is represented frequency values among the figure, its unit be a kilohertz, vertical shaft represents that its unit is a millimeter by the distance L of sparger nozzle to jet division place.In the process that changes electric voltage frequency, need the maximum limit fmax of decision frequency, it is the frequency maximum value that also will split into drop from the jet of sparger ejection.When frequency surpassed fmax, the generation of drop had just stopped.The minimum limit value fmin that also has a frequency.When frequency was lower than fmin, it is not corresponding with institute's making alive frequency that drop generates the unstable ， And that becomes.
After the relation that has determined distance L and frequency, can select the working value f of frequency
0The maximum value of general selective reaonance frequency is as the working value f of frequency
0, this maximum value is than the little amount that surpasses a certain setting value of maximum limit fmax of frequency.This setting value is selected in 30%～40% scope of greatest limit frequency f max usually, can guarantee that like this process of drop generation is enough stable, thereby can guarantee the reliability of generator work.As mentioned above, under resonant frequency, work and to guarantee that generator works most effectively.Select maximum value that generator is worked under the condition of snap action maximum effectively in many resonant frequencies of collateral security generator functional reliability.
For example, if select this setting value to equal 35% of greatest limit frequency, then under generator has situation corresponding to the frequency characteristic of curve 25, frequency of okperation f
0Should not surpass 65 * 0.65=42 kilohertz.Therefore, generator can be selected than the maximum value in 42 kilo hertzs of little resonance frequency value as frequency of okperation f hereto
0According to curve 25, frequency of okperation approximates 40 kilo hertzs.
After having selected frequency of okperation, can determine that the electric voltage frequency that is added on the piezoelectric element equals frequency f
1, f
1Surpass working value f
0An amount, this amount accounts for definite frequency f
1Share be the share that the above-mentioned setting value that chooses accounts for greatest limit frequency f max under the maximum allowble pressure condition just, be 35% to stable condition.Like this, the frequency of Que Dinging determines f by following formula
1=f
0+ 0.35f
1, as frequency of okperation value f
0When equaling 40 kilo hertzs, f
1It is 62 kilo hertzs.
When having determined frequency f
1Afterwards, can reduce fluid pressure gradually, observe the drop generative process simultaneously, determine that drop generates the pressure that stops.For in frequency f
1The concrete structure of the electric drip jet generator of work, the drop generative process stops (curve 26 among Fig. 3) under 0.24 MPa (MPa) pressure.Again make electric voltage frequency equal selected working value f then
0Like this, the pressure minimum value of the drop generative process that can guarantee to select to keep stable.Under pressure minimum, work and to make liquid-consumed minimum.
After having determined frequency and pressure, can adjust the piezoelectric element 7(Fig. 1 between sparger flange 4 and supporting element 1) impacting force; And determines that such impacting force value makes under this impacting force, along with reducing of above-mentioned power, distance L between sparger nozzle 3 and the jet division place increases, and along with the increase of this power, distance L remains unchanged.
By swivel nut 9 and thereby the decrement that changes spring 10 can adjust impacting force.
For a kind of concrete structure of electric drip jet generator, when pressure is 0.24 MPa (MPa) and frequency when being 40 kilo hertzs, the available curve shown in Figure 4 27 of the relation of distance L and clamping force P characterizes.Horizontal axis is represented clamping force P, and unit is newton, and vertical shaft is represented distance value, and unit is a millimeter.According to curve 27, distance L reduces just to have ended since 350 newton with the increase of putting forth effort P, and selected clamping force numerical value also will equal this value.
The method of this selection clamping force can guarantee piezoelectric element 7(Fig. 1 of being connected each other on the one hand) and the surface of sparger flange 4 between sound contact reliably, on the other hand, can make sparger do to have the vibration of peak swing.
Must be noted that, though this point is not illustrating on Fig. 4, (for example surpassing 1000 newton) when clamping force P is enough big, distance L begins to increase again, because spring 10(is Fig. 1) no longer work as an elastic element, fluid pressure pulsation is that stretching and compression by pipe 2 causes in sparger, rather than the vibration of pipe is moved and caused.
So, when such adjustment generator, can be stable in the drop generative process and the condition of working liquid body consumption minimum under guarantee that generator works effectively under high frequency.When generator being used for printing or marking, its frequency of okperation higher position can guarantee the print speed printing speed height, and when generator being used for granulation process or ingredients amount process, high frequency of okperation can guarantee high production rate.
Adjust electric drip jet generator under can be in sparger during working liquid body a little less than the using electric conductivity minimum condition that allows fluid pressure.The size of this pressure is determined by the minimum flying speed that allows of drop, for example, when drop drops on the base plate, is determined by the minimum speed that can guarantee the print request quality.Under this pressure, the distance L in decision division place and be added in relation between the electric voltage frequency on the piezoelectric element 7 from sparger nozzle 3 to jet.Curve 28 is illustrated under minimum authorized pressure 0.08 MPa (Mpa) condition of selecting for a generator concrete structure among Fig. 3, the relation of distance L and electric voltage frequency.
As seen from Figure 3, under this pressure, stable drop generative process is when frequency f min1, and for a concrete structure of generator, this frequency is 12 kilo hertzs, and frequency characteristic has several resonant frequencies.Minimum frequency in the general selective reaonance frequency is as frequency of okperation.For a concrete structure that has corresponding to the generator of the frequency characteristic of curve 28, the working value f of frequency
01It is 21 kilo hertzs.As can be seen from Figure 3, along with reducing of resonant frequency, the value of distance L reduces.Therefore, this adjusting method can reduce the time constant value of charging process, and this is to the liquid particular importance a little less than the electric conductivity, because the huge resistance of this liquid has determined that the charging process time constant is big.The cycle of selecting low resonant frequency as frequency of okperation drop is generated is increased to one can make the liquid drop of weak inductive pass through charging electrode 11(Fig. 1) time, although charging time constant also can obtain the value of necessary electric charge greatly.
The adjustment of piezoelectric element clamping force and top liquid to good conductivity are described similar.
For a concrete structure of generator, should be mutually at selected frequency and pressure under the condition of 21 kilo hertzs and 0.08 MPa (Mpa), the relation of distance L and clamping force P characterizes with the curve 29 of Fig. 4.According to curve 29, the situation that distance L reduces along with the increase of clamping force P as when the situation of the liquid that uses good conductivity, equals 350 newton from clamping force and begins to end at once, and selected clamping force just equals this power.
Claims (6)
1, a kind of electric drip jet generator, it comprises a supporting element (1), one is installed in the sparger that the middle And of supporting element (1) makes pipe (2) form, one end of pipe is equipped with nozzle (3), and flange (4) is arranged at its other end, it also comprises and being installed on the pipe (2), be positioned between flange (4) and the supporting element (1), be used for giving the piezoelectric element (7) of pipe (2) and comprise nut (9) that surrounds pipe (2) axial vibration, be positioned at the flange (4) of pipe (2) and the device that compresses piezoelectric element (7) between the supporting element (1), it is characterized by: pipe (2) might axially move relative to supporting element (1), and the device that compresses piezoelectric element (7) comprises a spring (10), it surrounds pipe (2), a part-one of them element that has elasticity And and be installed in one of two elements at the y direction of pipe (2) is supporting element (1), another element be pipe (2)-and and above-mentioned two elements in another have between the above-mentioned nut (9) of thread engagement relation.
2, the electric drip jet generator according to claim 1 is characterized by, nut (9) has the thread engagement relation with pipe (2), end from supporting element (1), spring (10) is installed between nut (9) and the supporting element (1), and piezoelectric element (7) and flange (4) are positioned at the other end of supporting element (1).
3, the electric drip jet generator according to claim 1 is characterized by, spring (22) is installed between flange (16) and the nut (21), nut (21) has the thread engagement relation with the part (13B) of supporting element (13), and flange (16) and piezoelectric element (17) are configured between another part (13a) of spring (22) and supporting element (13).
4, a kind of method of adjusting electric drip jet generator, it comprises the flange (4) that is pressed on sparger (2) and the piezoelectric element (7) between the supporting element (1), under pressure working liquid body is sent in the sparger (2), alternating voltage is added to piezoelectric element (7) to be gone up so that produce the pressure pulsation of working liquid body in sparger, change the electric voltage frequency that is added on the piezoelectric element (7), the nozzle (3) of decision sparger (2) and the jet that sprays from sparger split into distance between the place of drop, and (L) And determines the frequency of above-mentioned voltage, make it to equal resonance value, changing frequency under resonance value in any direction all can make above-mentioned distance (L) increase, it is characterized by: flange (4) and compressing by elastic element (10) of the piezoelectric element (7) between the supporting element (1) in sparger (2) are realized, impacting force (P) the And that changes piezoelectric element (7) determines such impacting force (P), when under this impacting force, along with reducing of above-mentioned power, the nozzle (3) of sparger (2) and the distance (L) that splits into from the jet of sparger ejection between the place of drop increase, and along with the increase of above-mentioned power (P), above-mentioned distance (L) remains unchanged.
5, its adjusting method of electric drip jet generator according to claim 4 is characterized as, when using the working liquid body of good conductivity, at first changing the electric voltage frequency that is added on the piezoelectric element (7) under the working liquid body maximum allowble pressure, in the make decision maximum limit (fmax) of frequency of this pressure, at this moment the jet from sparger (2) ejection also can split into drop, determines the working value (f of a maximum value as frequency from the resonance value of frequency
), this is worth than the little amount of above-mentioned maximum limit (fmax), and this amount is crossed a certain setting value at 30%～40% wide-ultra of said frequencies maximum limit (fmax), determines electric voltage frequency (f
1), it surpasses the working value (f of said frequencies
) amount, this amount accounts for definite frequency (f
1) share be just under maximum allowble pressure, the above-mentioned setting value that chooses accounts for the share of frequency maximum limit (fmax), split into the instantaneous pressure that reduces working liquid body before that drop is ended in jet flow from sparger (2) ejection, after this determine electric voltage frequency, make it to equal the above-mentioned working value (f of frequency
).
6, the electric drip jet generator according to claim 4 is characterized by, when the working liquid body a little less than the use electric conductivity, should be under minimum authorized pressure transportation work liquid, and determine to be added in electric voltage frequency on the piezoelectric element (7), make it to equal the minimum value in the resonance frequency value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89104825 CN1048913A (en) | 1989-07-15 | 1989-07-15 | Electric drip jet generator and adjusting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89104825 CN1048913A (en) | 1989-07-15 | 1989-07-15 | Electric drip jet generator and adjusting method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1048913A true CN1048913A (en) | 1991-01-30 |
Family
ID=4855712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89104825 Pending CN1048913A (en) | 1989-07-15 | 1989-07-15 | Electric drip jet generator and adjusting method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1048913A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106457825A (en) * | 2014-03-31 | 2017-02-22 | 录象射流技术公司 | Binary array inkjet printhead |
-
1989
- 1989-07-15 CN CN 89104825 patent/CN1048913A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106457825A (en) * | 2014-03-31 | 2017-02-22 | 录象射流技术公司 | Binary array inkjet printhead |
| CN106457825B (en) * | 2014-03-31 | 2018-12-14 | 录象射流技术公司 | Dyadic array inkjet print head |
| US11254130B2 (en) | 2014-03-31 | 2022-02-22 | Videojet Technologies Inc. | Binary array inkjet printhead |
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