CN107328688B - Spray density measuring device - Google Patents
Spray density measuring device Download PDFInfo
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- CN107328688B CN107328688B CN201610849518.1A CN201610849518A CN107328688B CN 107328688 B CN107328688 B CN 107328688B CN 201610849518 A CN201610849518 A CN 201610849518A CN 107328688 B CN107328688 B CN 107328688B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
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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
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
- B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
- B05B7/0408—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing two or more liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
- B01D1/18—Evaporating by spraying to obtain dry solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
- B01D1/20—Sprayers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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Abstract
A device for measuring spray density comprises a block fixing plate, a movable square plate, stand columns, a driving device and a controller, wherein two guide rails and two stand columns are arranged on the fixing plate; the movable square plate is arranged on the two guide rails, a plurality of trapezoidal square cups used for receiving the spray are uniformly arranged in the movable square plate along the direction of the parallel guide rails and the direction of the vertical guide rails, the mist absorbing materials are arranged in the trapezoidal square cups, and the movable square plate can move back and forth on the two guide rails under the combined action of the controller, the driving device and the transmission device, so that the spray density of the atomizing nozzle can be measured. The spray density measuring device can well measure the indexes such as the appearance, the spraying distance, the spatial distribution uniformity and the like of the mist sprayed by the atomizing nozzle.
Description
The present application is a divisional application of the present invention entitled "fluid atomizing nozzle, density measuring apparatus and drying apparatus having the nozzle", filed 2016, 12/5/2016, and filed under the name of 201610311620.6.
Technical Field
The invention belongs to the technical field of machine manufacturing, and particularly relates to a device for measuring the spray density of an atomizing nozzle.
Background
The current atomizing nozzle structure can be divided into four types according to atomizing modes, namely ① single-hole high-pressure direct injection atomization, ② centrifugal atomizing nozzle, wherein under high pressure, fluid 1 is enabled to rotate radially through a constant-diameter spiral channel and then is mixed and atomized with fluid 2 which is axially communicated, or the fluid 1 is directly enabled to enter a fluid mixing chamber along a small hole in the tangential direction of the side wall of the mixing chamber for rotating, mixed and atomized, ③ high pressure, gas and liquid both pass through the through channel, but a plurality of gas outlets are arranged around the liquid outlets, and the outlet direction and the liquid outlet direction form the same acute angle, so that mixed atomization is realized, ④ atomization is realized by means of a rotating disc or a rotating wheel or a rotating cup which rotates at high speed, wherein ① is the simplest structure, but the application range is narrow, the pressure loss is large, the particle size distribution range of mist is the widest, ② is wide, the particle size of the atomizing effect is good, the pressure loss of the former is larger, the latter is the radius of the mixing chamber is the ②, and the rotating speed distribution range of the rotating disc is larger, and the rotating speed distribution of the rotating disc is larger, so that the rotating disc is required by the 3526 high rotating speed distribution, the rotating disc, the rotating speed distribution of the rotating disc is larger, and the rotating disc is required by the narrow, the rotating disc is larger, the rotating disc is required by the rotating speed distribution of the rotating disc, and the rotating disc is still larger, the rotating disc is required by the rotating disc, the rotating disc is still larger, the rotating disc is required by the rotating disc is still larger, the rotating disc is required by the rotating disc, the rotating.
In summary, the current centrifugal nozzle has some advantages for low viscosity fluids, but it also has a disadvantage that the spray fluid spins, which, while facilitating mixing with other low density fluids, does not facilitate uniform distribution of the "mist". This inevitably reduces the thrust of rockets and jet planes.
Secondly, no technical means for accurately measuring the spray density of the nozzle exists in the prior art, so that the evaluation of the nozzle performance lacks of comprehensive scientific basis.
Disclosure of Invention
The invention aims to provide a static nozzle which has high efficiency, low resistance, ultrahigh-speed rotation of fluid, does not need to add a rotating part, has relatively small required pressure low limit, has small 'fog' particles and narrow particle size distribution range, and has controllable fog density distribution. Meanwhile, a reliable fog density distribution measuring device and method are provided.
In order to solve the technical problems, the invention adopts the technical scheme that: a device for measuring spray density comprises a block fixing plate, a movable square plate, stand columns, a driving device and a controller, wherein a plurality of stand bar bolts are uniformly arranged at the bottom of the fixing plate, two guide rails are arranged on the upper surface of the fixing plate along the length direction of the fixing plate, two stand columns are symmetrically arranged on the left side and the right side of each guide rail in the middle of the upper surface of the fixing plate, scale marks are arranged on the stand columns, a cross beam is arranged between the two stand columns, an atomizing nozzle to be measured is fixedly arranged in the middle of the cross beam and can move up and down back and forth on the two stand columns along with the cross beam, and a fixing and locking device for fixing the horizontal position of the cross beam is further arranged on each;
the movable square plate is arranged on the two guide rails, a plurality of trapezoidal square cups used for receiving spraying are evenly arranged in the movable square plate along the direction of the parallel guide rails and the direction of the vertical guide rails, a mist absorbing material is arranged in each trapezoidal square cup, the controller and the driving device are both arranged at one end of the fixing plate, a transmission device is further connected between the driving device and the movable square plate, and the movable square plate can move back and forth on the two guide rails under the combined action of the controller, the driving device and the transmission device, so that the spraying density of the atomizing nozzle can be measured.
And a water level is also arranged on the fixing plate.
The mist absorbing material is inorganic salt which is not moisture-absorbing at normal temperature and normal pressure.
A layer of fog absorbing substrate is laid at the part of the movable square plate which is not provided with the trapezoidal square cup.
The material of the fog absorbing substrate is any one of polyacrylic acid glycerol polycondensate, asbestos cloth impregnated solid paraffin or calcium carbonate powder impregnated solid paraffin.
The invention has the beneficial effects that:
the spray density measuring device can well measure the indexes such as the appearance, the spraying distance, the spatial distribution uniformity and the like of the mist sprayed by the atomizing nozzle. The accuracy of the determination result is high, and the method has practical application value for uniformity of pesticide spraying, combustion performance of fuel, spray drying effect of chemical products and the like.
Drawings
FIG. 1 is a schematic diagram of a single fluid high rotational velocity atomizing nozzle according to the present invention;
FIG. 2 is a longitudinal sectional view of FIG. 1;
FIG. 3 is a schematic view of the enlarged partial structure of FIG. 2;
FIG. 4 is a schematic structural view of a two-fluid high swirl velocity atomizing nozzle of the present invention;
FIG. 5 is a longitudinal sectional view of FIG. 4;
FIG. 6 is an enlarged partial schematic view of FIG. 5;
FIG. 7 is an axial cross-sectional view along direction AA' of FIGS. 1 and 4;
FIG. 8 is an axial cross-sectional view taken along line BB' of FIG. 4;
FIG. 9 is a schematic longitudinal sectional view of a multi-fluid high rotational velocity atomizing nozzle according to the present invention;
FIG. 10 is an enlarged partial schematic view of FIG. 9;
FIG. 11 is a schematic view showing the structure of a spray density measuring apparatus according to the present invention;
FIG. 12 is a schematic view of the structure of the spray drying apparatus of the present invention;
the labels in the figure are: 1. the single-hole spray head comprises a single-hole spray head, 2, a cylindrical shell I, 3, a truncated cone-shaped shell, 4, a cylindrical shell II, 5, a conical shell, 6, internal screw threads, 7, external screw threads, 8, an atomizing nozzle, 9, a screw port connecting seat, 10, a connecting pipe, 11, a high-pressure fluid pipe, 12, a cavity sealing screw cover, 13, a nozzle cap, 14, a fluid input cavity, 15, an outlet gap, 16, a fixing plate, 17, a movable square disc, 18, a stand column, 19, a driving device, 20, a controller, 21, a support bolt, 22, a guide rail, 23, a scale mark, 24, a cross beam, 25, an atomizing nozzle to be measured, 26, a trapezoidal square cup, 27, an atomizing material, 28, a drying tower, 29, a top sealing plate, 30, a fluid conveying pipe to be dried, 31, a compressed hot air conveying pipe, 32, a separating sleeve, 33, an inner cavity, 34, an outer cavity, 35, a backflow port, 36, a, A settling chamber, 38, a control butterfly valve, 39, a discharging machine, 40, a hopper, 41, a fluid mixing cavity, 42, an external connection screw port, 43, a needle valve, 44, a loose joint, 45, a roller, 46, a fog absorbing substrate, 47, a laser, 48, a laser receiver I, 49, a square cup fixing seat, 50, a nozzle moving sleeve, 51, a low-density fluid pressure pipe, 52, a high-density fluid pressure pipe, 53, a fixing bolt of the nozzle moving sleeve, 54, a laser receiver II, 55, a laser receiver III, 56, a sampling position, 57, a transition position, 58, a transmission worm, 59, a leveling instrument, 60, fine particles, a water vapor flowing direction, 61, a sight glass, 62, a motor, 63, a lighting lamp, 64, a product particle settling direction, 65, fine particles and an air outlet, 66 and a centrifugal separation tank interface.
Detailed Description
The atomizing nozzle of the present invention includes three kinds:
1. single fluid atomization
The lower part of a cylindrical cavity I enclosed by a cylindrical shell I is connected with a truncated cone-shaped cavity with the same diameter as the cylindrical cavity I in the upper bottom diameter, the lower bottom diameter of the truncated cone-shaped cavity is only a plurality of times of the diameter of the upper bottom of the truncated cone-shaped cavity, and the lower bottom of the truncated cone-shaped cavity is connected with a small cylindrical shell II with the same diameter as the lower bottom diameter of the truncated cone-shaped cavity. The side wall of the cylindrical shell II is carved with external thread threads, and the lower part of the cylindrical shell II is connected with a conical shell with an opening at one end and a small hole at one end in a matching way. The side wall of the cylindrical shell I is provided with a plurality of screw port connecting seats of the common single-hole spray head, the inner cavity of each screw port connecting seat can accommodate the head of the common single-hole spray head, the nozzle part of the common single-hole spray head is communicated with the inner cavity of the cylindrical cavity, and the tail part of the common single-hole spray head is connected with the high-pressure fluid pipe. The inner side of the upper part of the cylindrical shell I is carved with an inner thread and is sealed by a screw head cavity sealing screw cap carved with an outer thread in a matching way.
The nozzle body is also provided with a nozzle cap at the bottom of the conical shell, the external thread of the nozzle cap is connected with the internal thread at the bottom of the conical shell (the external thread at the bottom of the conical shell is used as a second option for fixing the nozzle), and the tail end of the inner wall of the conical shell and the inner wall of the nozzle cap are connected into a Laval nozzle structure. Thus, the single fluid atomizing nozzle of the present invention is constructed.
The single fluid high rotation speed atomizing nozzle belongs to an external mixing type nozzle, after the fluid is sprayed out from the single fluid high rotation speed atomizing nozzle, the constraint of a nozzle cap is lost, the centrifugal force generated by rotation and the internal pressure of the fluid during high-speed movement are smaller than the static pressure of the surrounding air, a liquid column is necessarily rotated to be dispersed and sprayed out, and the air is also necessarily mixed into the liquid column to form spray. However, the mist ejected from such a nozzle tends to be dispersed and moved around the advancing direction of the rotating fluid having a relatively high density after the fluid is separated from the mist, and the penetration of the air which is stationary around the nozzle is advantageous for the formation of the mist, but the capability of restricting the mist particles of the fluid having a relatively high density is relatively limited. Thus, the mist has a large diameter, a short spray distance, and a low mist concentration near the central axis. Therefore, the nozzle has the greatest advantage that the low limit of pressure required by atomization is low, and the nozzle is only suitable for occasions with low requirements on the uniformity of fog.
2. Two-fluid internal mixing atomization
The method comprises the following steps of removing a nozzle cap from a single-fluid high-rotation-speed atomizing nozzle at the upper part and prolonging the cone height of a conical shell by using two single-fluid high-rotation-speed atomizing nozzles, removing a screw head cavity sealing screw cap at the upper part from a single-fluid high-rotation-speed atomizing nozzle at the lower part, connecting the single-fluid high-rotation-speed atomizing nozzle at the lower part with an outer screw of a cylindrical shell II of the single-fluid high-rotation-speed atomizing nozzle at the upper part, and enabling the outer wall and the outer diameter of a lower cone of the single-fluid high-rotation-speed atomizing nozzle at the lower part to be larger than those of the upper wall and the outer diameter of the lower cone of the single-fluid high-rotation-speed atomizing nozzle at the upper part so as to finally enable the end part of the conical shell of the single-fluid high-rotation-speed atomizing nozzle at the upper part. Thus, the two-fluid high-rotation-speed atomizing nozzle is formed.
The two-fluid atomizing nozzle belongs to an internal mixing type atomizing nozzle, and when the rotating directions of two fluids are opposite and the sum of the angular momentum of the two fluids is zero, the atomizing distance is long, and the atomizing density is uniform. This is because, after the high-density fluid is ejected from the single-liquid high-rotational-speed atomizing nozzle at the upper part thereof, the restriction of the lower port of the conical housing is lost, but the high-density fluid immediately encounters the "rotation stopping" action of the relatively low-density fluid in the opposite rotation direction. This action not only greatly promotes the mixing of the two fluids, but also rapidly reduces their rotational speed. Thus, the mixed fluid, which is actually a high pressure, high density "mist," is ejected from the nozzle under pressure in the direction of the nozzle axis. The high pressure and high density mist is sprayed with the combined action of high pressure inside the mist and static air outside the nozzle, and the mist column has enlarged diameter with increased spraying distance, but the rotating speed of the mist particle is almost lost, so the power of the radial motion caused by the rotation is also lost. This is very beneficial to increase the driving force of rockets and jet planes, and to spray and remove dust. In other cases, such as spray drying of liquid products, larger solid product particles are required to allow co-rotation of the two fluids, but it is not so difficult to obtain larger solid product particles despite poor mixing and broad droplet size distribution.
3. Multiple fluid internal mixing atomization
According to the manufacturing method of the double-fluid high-rotation-speed atomizing nozzle, a plurality of single-fluid high-rotation-speed atomizing nozzles are sleeved between an upper single-fluid high-rotation-speed atomizing nozzle and a lower single-fluid high-rotation-speed atomizing nozzle, the outer diameter and the inner diameter of the cone height and the lower cone opening of the conical shell of each single-fluid high-rotation-speed atomizing nozzle are sequentially adjusted from top to bottom, the lower end parts of the single-fluid high-rotation-speed atomizing nozzles extend downwards in the vertical direction sequentially to form a mixing space with the nozzle cap of the last single-fluid high-rotation-speed atomizing nozzle, the inner wall of the lower single-fluid high-rotation-speed atomizing nozzle is larger than the outer wall of the upper single-fluid high-rotation-speed atomizing nozzle to form respective fluid input cavities, and therefore the double-fluid high-rotation-speed atomizing nozzle is formed.
The multi-fluid high-rotation-speed atomizing nozzle, in particular to a three-fluid high-rotation-speed atomizing nozzle, has very wide application. For spray drying of many industrial products, we can first pass the fluid to be dried, air (inert to the product), hot air, through a multi-fluid high-swirl-velocity atomizing nozzle from the inside out. The rotation direction of each fluid is determined according to specific conditions, and the principle is that if the mist is uniform in density and far in spraying distance, the sum of the angular momentum of each fluid is close to zero as much as possible. Otherwise, the rotation directions of the fluids should be the same, but the sizes should have different differences, the difference which is difficult to mix is larger, and the difference which is easy to mix is smaller. For example: when the three-fluid atomizing nozzle is used for spray drying of the product, the fluid to be dried, air (inert to the product) and hot air can firstly pass through the three-fluid atomizing nozzle from inside to outside in sequence. The rotation directions of the first fluid and the second fluid are opposite, and the rotation direction of the third fluid is determined according to specific conditions. The principle is as follows: if the product particles are to be fine, the rotational speed of the particles of the first fluid is brought as close to zero as possible. The drying mode has the advantages of high drying speed, power resource saving, small product particles and narrow particle size distribution range; if the product has large particles, the three fluids should have the same rotation direction to form an umbrella-shaped fog column.
The connecting pipe of the high rotational speed fluid atomizing nozzle can be a hard pipe or a soft pipe, and the hard pipe can be provided with a plurality of movable joints 44 for connecting pipelines according to the situation.
The basic principle of the present invention is as follows.
When a two-fluid or multi-fluid high-rotation-speed atomizing nozzle is used, fluids with gradually reduced density are introduced from inside to outside in sequence. When the single-fluid high-rotation-speed atomizing nozzle works, the fluids with different densities are sprayed out through the common single-hole spray heads of the single-fluid high-rotation-speed atomizing nozzle under the action of pressure, and the fluids are forced to rotate in the cylindrical shell I of the single-fluid high-rotation-speed atomizing nozzle of the single-. When the whole system reaches stable balance, that is, the transmission power and the resistance are equal, the resultant external force borne by the fluid particles can be considered to be zero, and at the moment, the following relationship exists according to the law of conservation of angular momentum
L=mR1 2ω1= mr2 2ω2= fixed value ①
Or L = mv1R1=mv2r2= fixed value ②
Where L is the angular momentum of the fluid particles, m is the mass of the fluid particles, and R1Is the axial section radius, r, of the cylindrical housing I2Radius, omega, at the outlet of the conical casing1For the rotational speed, omega, of the fluid in the cylindrical housing I2The rotational speed v of the fluid at the outlet of the conical shell1Is the linear velocity v of the fluid in the cylindrical shell I2Is the linear velocity of the fluid at the exit of the conical shell.
From ① formula ω2/ω1=（R1/r2）2③
V is obtainable from formula ②2/v1=R1/r 2④
Due to R1Is r2Tens of times (or even higher), and therefore, ω is known from the formula ③2Is omega1A multiple of several tens of times square of (v) is represented by formula ④2Is v1Tens of times, which indicates that the present invention has a significant multiplication effect on both fluid rotational speed and linear velocity.
For a two-fluid high rotational velocity atomizing nozzle, after the first fluid and the second fluid are contacted, if their rotational directions are opposite, this is equivalent to increasing the rotational speed of the first fluid by almost one time in terms of relative movement, which is very favorable for their uniform mixing. Compared with the air outside the nozzle, the rotating speed of the mixed two fluids is nearly zero, and the mist column is facilitated to be sprayed farther, so that the side effects of short spraying distance of mist, uneven mist density and the like caused by the rotation of the atomized fluid are eliminated.
In the process of fluid passing through the invention, the resistance mainly comes from the outlet diameter of a common single-hole spray head and the diameter of the spray nozzle of the invention, and the invention can be provided with a plurality of common single-hole spray heads according to the requirement, so the sum of the resistance is obviously a fraction of that of a single common spray nozzle, namely the resistance of the invention is much smaller than that of a ② type atomizing spray nozzle and much narrower than that of a ③ type spray nozzle, compared with a fourth type spray nozzle, the rotation direction of each fluid is the same without additional power, and the problems of liquid leakage (or air leakage) and the like do not exist.
Indeed, tornadoes are a similar but distinct model of the present invention. When the rotation radius of the high-altitude rotating air flow is hundreds of kilometers or even thousands of kilometers, the rotating speed and the flow velocity around the center of the high-altitude rotating air flow are very small, the density of the high-altitude rotating air flow is increased and sunk under the low-temperature environment of the high altitude, the rotating radius of the high-altitude rotating air flow is gradually reduced under the extrusion of high-pressure air around the high-altitude rotating air flow, the rotating speed and the flow velocity of the rotating air around the center of the rotating air flow are continuously increased according to the angular momentum conservation principle. Unlike tornado, the present invention has continuous high pressure driving force and thus stable and continuous operation, and the tornado has energy consumption caused by the resistance of its inner air and its surrounding air and thus stops its work.
The present invention differs from a tornado in that the present invention is rigid in constraining the fluid, so that the fluid not only increases in rotational speed but also increases in vertical flow velocity as the radius of rotation decreases during the downward movement. When the fluid with higher density moves to the outlet of the conical shell, the fluid is suddenly out of constraint, so that the fluid moves downwards, and simultaneously, the centrifugal force generated by rotation causes the fluid to move along the tangential direction of the inner wall of the lower bottom of the conical shell, at the moment, the fluid with lower density which rotates in the opposite (or same) direction on the outer side is still rigidly constrained, the fluid with lower density is forced to move towards the axis by the invasion of the fluid with higher density, and if the rotating directions of the fluid with lower density are opposite, obviously, the fluid is very beneficial to mixing and atomizing the fluid.
The following further describes the method of the present invention by taking two fluids as an example with reference to the accompanying drawings.
As shown in the figure, the needle valve 43 is opened, and the high-density fluid and the low-density fluid are respectively delivered into the two-fluid high-rotation-speed atomizing nozzle through the connecting pipe of the upper and lower single-fluid high-rotation-speed atomizing nozzles and the common single-hole nozzle.
High densityWhen the fluid moves downwards, the rotational speed of the fluid increases to the original (R) according to the principle of conservation of angular momentum when reaching the outlet of the fluid1/r2）2And (4) doubling. Then entering the fluid mixing chamber 41, the denser fluid suddenly loses its confinement and, while moving downward, will move in a tangential direction to the inner wall of the high density fluid outlet by the centrifugal force generated by the rotation. At the same time, the fluid with a lower density on the outside is still rigidly constrained, and the invasion of the fluid with a higher density will force the fluid with a lower density, which has also been greatly increased in rotation speed, to move toward the axis. If the high and low density fluids rotate in opposite directions, they will rapidly mix in the fluid mixing chamber 41 and at the same time will rapidly reduce their rotational speed, creating a high pressure, high density mist. The high-pressure and high-density fog is sprayed out from the lowest atomizing nozzle under the action of pressure. Since the high-density and low-density fluid basically loses the rotating speed, the spraying direction of the high-pressure and high-density fog is necessarily the axial direction of the invention. The high-pressure and high-density fog completely loses the restriction of the atomizing nozzle of the invention after passing through the atomizing nozzle at the lowest end of the invention, and under the combined action of the subsequent pressure, the internal high pressure and the static air at the periphery of the atomizing nozzle 8, the high-pressure and high-density fog expands and rapidly moves forwards at the same time, and fog with uniform density is formed in the axial section of the fog column.
Although different working conditions have different requirements on the performance of the mist, the indexes such as the appearance, the spraying distance, the particle size and the distribution of the mist, the spatial distribution uniformity of the mist and the like are always important indexes for judging the performance of the atomizing nozzle. Relatively, the appearance and the spraying distance of the fog can be easily measured; the particle size and the particle size distribution need to be continuously explored although the measurement results of various measurement methods have larger differences, but the methods are not limited; however, for the uniformity of the spatial distribution of the mist, no accurate and reliable measuring method exists so far. The uniformity of the spatial distribution of the mist has important influence on the uniformity of pesticide spraying, the combustion performance of fuel, the spray drying effect of chemical products and the like.
In order to accurately evaluate the performance of the atomizing nozzle, a spray density measuring device is specially designed, wherein the functions of a button/switch of a controller are as follows (the time setting and the electric appliance principle of the controller belong to the conventional technology and are not described in detail).
The operation method comprises the following steps:
1. the spraying equipment and the spraying density measuring device of the invention are prepared, and the lower six leg bolts 21 are adjusted while observing the level gauge 59, and the method is that the leg bolts at the near-center and far-center sides are suspended, and then the other three leg bolts are adjusted to level the fixed plate 16, and then the suspended leg bolts are held without affecting the level of the fixed plate 16.
2. Fixing the atomizing nozzle 25 to be measured to the scale a11 of the upright post 14, moving away the trapezoidal square cup 26, paving the measuring paper Z11 in the movable square plate 17, turning on the power supply of the controller 20, selecting a blank gear, pressing the start button, measuring the wetting size on the Z11 in the direction perpendicular to the guide rail 22 after the movable square plate 17 is reset, namely the diameter D11 of the fog column at the scale a11, fixing the atomizing nozzle 25 to be measured to the scale a12 of the upright post 14, and repeating the process to measure a12, D12 and … …
3. By rotating the atomizing nozzle 25 to be measured of the present invention by 90 °, repeating the 2 nd step, a21, D21, a22, D22, … … can be measured.
4. According to the measured diameter of the mist column at a certain position on the scale mark 23, a specific position (marked as K) of the atomizing nozzle 25 to be measured on the scale mark 23 is determined1) And a fixing bolt 53 for fixing the nozzle moving clamp sleeve arranged on the nozzle moving clamp sleeve 50; according to the measured diameter of the mist column at the position and the number of the trapezoidal square cups 26 needing to be clamped on the square cup fixing seat 49 in the movable square plate 17, which are arranged according to the length of the upper opening edge of the trapezoidal square cup 26, the sum of the edge lengths of the trapezoidal square cups 26 in a single row (or column) is required to be larger than the diameter of the mist column at the position.
5. Each trapezoidal square cup 26 and its lid are numbered, weighed, and recorded in sequenceIs Hi0(i is a column number, the same applies hereinafter) and Sj0(j is the row number, the same below), and then they are reset after decapping.
6. Turning on the power switch of the controller 20, setting the blank/measurement switch at blank position, spraying again, after the spraying is stable, pressing the start button, driving the device 18, that is, the motor rotates forward, the movable square plate 17 moves forward and leftward, when reaching the transition position 57, the motor rotates backward to return to the original position, stopping spraying, weighing the trapezoidal square cup 26 with cover, and recording as Hi1And Sj1。
7. After the trapezoidal square cup 26 is reset, the blank/measuring switch is placed at a measuring position and the measuring time t is set, spraying is carried out again, after the spraying is stable, the starting button is pressed, the motor rotates forwards, the movable square plate 17 moves forwards and leftwards, after the transition position 57 is reached, the motor rotates backwards to return to the sampling position, the motor stops rotating, and timing starts.
8. When the set time is up, the motor is started and continuously rotates reversely, the laser receiver I48 is switched on, when the movable square plate 17 returns to the original position, spraying is stopped, the power supply of the controller is turned off, the cover of each trapezoidal square cup 26 is covered, the trapezoidal square cups 26 are weighed with covers, and the weighing is recorded as Hi2And Sj2。
9. Calculation △ Hi=（Hi2- 2（Hi1-Hi0) T and △ S)i=（Si2- 2（Si1-Si0) T), then △ HiAnd △ SjThe density distribution of the fog column on the K1 section (perpendicular to the axial direction of the fog column) can be reflected.
10. The atomizing nozzle 25 to be measured according to the invention is displaced by another position (denoted K) on the graduation mark 842) Repeating the steps of 4-9 to obtain a group of data, and measuring KiAnd (4) drawing two radial density distribution curves of the measured fog column in mutually perpendicular directions.
It should be noted that if the movable square plate 17 is filled with the trapezoidal square cups 26, the density distribution of the fog columns in the three-dimensional space can be drawn by the above method; the smaller the side length of the trapezoidal square cup 26, the higher the accuracy of the measurement result.
The mist absorbent 27 provided in the trapezoidal cup 26 of the spray density measuring apparatus may be an inorganic salt that does not absorb moisture at normal temperature and pressure, for example, a powder mixture of sodium chloride and barium sulfate. The material of the fog absorbing substrate 46 arranged in the movable square disc 17 can be diaper (polyacrylic acid glycerol polycondensate); when the atomizing nozzle sprays oil mist, the mist absorbing substrate 46 can be made of asbestos cloth impregnated solid paraffin (heated and melted), and the mist absorbing material 27 can be made of calcium carbonate powder impregnated solid paraffin.
The distribution of the spray density of the single-fluid high-rotational-speed atomizing nozzle and the two-fluid high-rotational-speed atomizing nozzle of the present invention in both the horizontal and vertical directions perpendicular to the axis of the mist column was measured by the above-mentioned spray density measuring method, and the results are shown in tables 1, 2, and 3.
TABLE 1 axial distance 3.5cm (160 cm diameter of mist column cross section) from the outlet of the single fluid nozzle of the present invention
Measurement results of mist Density distribution
② common nozzle 4 with 4mm diameter outlet (same below)
③ diameter of the single fluid nozzle of the invention is 200mm and diameter of the cylindrical housing II is 8 mm.
As can be seen from the data in Table 1, the fog columns of the single-fluid nozzle I are distributed in an umbrella shape, the fog density near the umbrella columns is obviously lower, particularly the vertex angle of the fog columns is very large, and the fog density is measured only at the position 3.5cmc away from the nozzle, if only 2-36 trapezoidal square cups are considered, △ Hi、△SjThe average relative errors of (1) were 73.0% and 61.2%, respectively, but they were not much more than compared with the fog density at the same distance from the "umbrella pole".
TABLE 2 axial distance 112cm (diameter of mist column cross section 80 cm) from the outlet of the two-fluid nozzle of the present invention
Measurement results of mist Density distribution
Remarking:
① small car washing pump supplies water with pressure of 0.8MPa and flow rate of 32L/min, air compressor supplies air with pressure of 0.8MPa and flow rate of 300L/min;
② common single-hole nozzles are 8, the diameter of the outlet, the high density fluid and the low density fluid are respectively 4mm and 8 mm;
③ two-fluid atomizing nozzle of the invention, the diameters of the two chambers of high and low density fluid, namely R1 and R2
The diameters of the cylindrical shells II of the upper single-fluid high-rotation-speed atomizing nozzle and the lower single-fluid high-rotation-speed atomizing nozzle are respectively 440 mm and 200mm, and the diameters of the cylindrical shells II of the upper single-fluid high-rotation-speed atomizing nozzle and the lower single-fluid high-rotation-speed atomizing nozzle are respectively 8mm and 14.6 mm.
TABLE 3 axial distance 168cm from the exit of the two-fluid nozzle of the present invention (mist column cross-section diameter 120 cm)
Measurement of fog Density distribution
Remarking:
① small car washing pump supplies water with pressure of 0.8MPa and flow rate of 32L/min, air compressor supplies air with pressure of 0.8MPa and flow rate of 300L/min;
② common single-hole nozzles are 8, the diameter of the outlet, the high density fluid and the low density fluid are respectively 4mm and 8 mm;
③ two-fluid atomizing nozzle of the invention, the diameters of the two chambers of high and low density fluid, namely R1 and R2
The diameters of the cylindrical shells II of the upper single-fluid high-rotation-speed atomizing nozzle and the lower single-fluid high-rotation-speed atomizing nozzle are respectively 440 mm and 200mm, and the diameters of the cylindrical shells II of the upper single-fluid high-rotation-speed atomizing nozzle and the lower single-fluid high-rotation-speed atomizing nozzle are respectively 8mm and 14.6 mm.
As can be seen from the data in Table 2, the two-fluid nozzle of the present invention has the "mist column" in a trumpet shape, and the mist density of the mist column axis (11 # trapezoidal square cup) is slightly higher than that of the trapezoidal square cup 26 numbered 4-18Somewhat, the distribution of the "fog" was also substantially uniform overall, △ Hi、△SjThe relative error of (a) is between 2.8% and 2.4%, respectively. It is fully proved that the two-fluid nozzle of the invention adopts the high-density fluid and the low-density fluid to reversely rotate, and the angular momentum of the two fluids is equal in magnitude and opposite in direction by adjusting the relevant parameters of the first shell and the cylindrical shell, so that the divergence of the fog column can be controlled to a certain extent.
As can be seen from Table 3, the mist column diameter is increased and the density is reduced with the increase of the distance from the nozzle of the invention, but the mist density distribution on the cross section of the mist column is still relatively uniform within the trapezoidal square cup 26 with the serial number of 4-26, △ Hi、△SjThe relative error of (a) is between 2.9% and 3.2%, respectively. Combining the measurement results of tables 2 and 3, it can be calculated that the "mist column" apex angle of the two-fluid nozzle of the present invention is only 39 °.
The method of carrying out the spray drying apparatus of the present invention for spray drying a foam concrete foaming agent will be described below with reference to examples.
Example 1
The basic parameters of this embodiment are as follows.
Used for the experiment was a spray drying tower with an annual production of 1300 tons, with hydraulic pump flow: 12 kg/min; fan flow: 130 m3Min; air compressor machine flow: 0.3 m3/min；
The diameter of an inner cavity separated by a separation sleeve in the drying tower is 390mm, and the diameter of an outer cavity is 800 mm; the height of the separating sleeve is 2290mm, and the height of the drying tower (namely the height from the top end sealing plate to the bottom of the cyclone cavity) is 3600 mm.
The bore of ordinary haplopore shower nozzle (4 equipartitions) on the lateral wall of lower part whirl chamber in the drying tower: 40 mm;
the diameter (4 uniform distribution) of a common single-hole spray head which is matched and connected with a fluid conveying pipe to be dried in the double-fluid high-rotation-speed atomizing nozzle is as follows: 1 mm;
the diameter (4 uniform distribution) of the common single-hole spray head matched and connected with the compressed hot air conveying pipe in the double-fluid high-rotation-speed atomizing nozzle is as follows: 4.5 mm;
the hot air inlet temperature is 200 ℃, the outlet temperature is 100 ℃, and the cold air and the cold foaming agent solution are preheated by a heat exchanger.
Although the liquid foam concrete foaming agent can be directly used, the packaging cost is high, the transportation is inconvenient, particularly in recent years, the anti-terrorist requirement exists, the national and logistics enterprises have stricter requirements and inspection on the transportation of liquid products, and particularly the transportation to foreign countries is more difficult. For this reason, it is necessary to produce a solid product from a liquid foam concrete foaming agent.
Spray drying is a common method of making liquid products into solid products. However, the existing spray drying tower has the advantages that firstly, the production capacity of unit tower volume is small; two fluids only move reversely in the vertical direction and do not have the capability of separating gas and solid phases; thirdly, the defect of tower adhesion exists mostly, and the tower cleaning is required to be stopped at intervals. By using the atomizing nozzle and adjusting the structure of the tower, the production capacity of unit tower volume can be obviously improved; at the same time, the two fluids not only move reversely (a small amount of same direction) in the vertical direction, but also more importantly, the gas and solid phases rotate in the horizontal direction, thereby having certain gas and solid phase separation capability and overcoming the defect of tower adhesion. In addition, the diameter of the outlet 31 of the atomizing nozzle is larger, so that power resources are saved.
The specific principle and operation process are as follows.
As shown in fig. 12, the concentrated solution of the foam concrete foaming agent passes through the fluid delivery pipe 30 to be dried under the action of the hydraulic pump, enters the upper single-fluid high-rotation-speed atomizing nozzle of the two-fluid high-rotation-speed atomizing nozzle arranged at the top of the drying tower through the pressure foaming agent solution inlet, hot air at 200 ℃ passes through the compressed hot air delivery pipe 31, enters the lower single-fluid high-rotation-speed atomizing nozzle of the two-fluid high-rotation-speed atomizing nozzle through the pressure hot air i port, and enters the fluid mixing chamber 41 of the two-fluid high-rotation-speed atomizing nozzle, although the two fluids rotate in the same direction, the flow speed of the hot air is high, micelles in the foam concrete foaming agent are torn, and water in the fluid mixing chamber is heated to generate steam, so that high-pressure and high-density aerosol is formed. Because the two fluids rotate in the same direction, the high-pressure and high-density aerial fog forms an umbrella-shaped aerial fog column after being sprayed out. Under the constraint of the side wall of the inner cavity 33 separated by the separation sleeve 32, solid particles can collide with the wall of the inner cavity 33 and rebound (the function of cleaning the wall is achieved, but the significance of the function on the foam concrete foaming agent is not great, and the wall cannot stick to the wall after adsorbing a layer of surfactant in the foam concrete foaming agent) and continuously grow in motion; the water vapor, due to its minimum density, will be located near the centerline of the cavity 33, with a layer of air of greater density surrounding it, thereby effecting a preliminary separation of the solid components from the moisture in the foamed concrete blowing agent. After reaching the outlet of the inner chamber 33, the "umbrella" mist column expands further and contacts with the co-rotating pressurized hot air supplied by the conventional single-hole nozzle provided on the sidewall of the swirling chamber 36, and is further rotated at a higher speed and the partial pressure of the water vapor is relatively reduced to promote further evaporation of the water in the solid particles and aggregation into larger particles. The large-particle solid product sinks to a settling chamber 37 at the lower part of the drying tower along the direction shown by the settling direction 64 of the product particles to become a solid foaming agent; while the solids, water vapor and air, which are very small in size, will enter the outer chamber 34 under pressure in the direction indicated at 60. In the outer chamber 34, the solids with very small particles will gradually grow larger and settle in a vertically downward direction due to the reduced flow rate, longer residence time and reduced partial pressure of the water vapor. When the particles which cannot be settled are lifted to the return opening 35, the pressure of the outer cavity 34 is higher than that of the inner cavity 33 due to the fog flow generated by the two-fluid high-rotation-speed atomizing nozzle, and a certain amount of solid matters with extremely small particles and water vapor enter the inner cavity 33 again through the return opening 35, so that a condensation center (seed crystal) of the solid matters is introduced and formed, and the product particles are enlarged and the particle sizes are more interesting and uniform. Because the air, the water vapor and the tiny solid particles in the spray drying tower rotate at high speed, and the outlets of the air, the water vapor and the tiny solid particles are arranged near the center line of the drying tower, the tiny solid particles can be thrown to the vicinity of the inner wall of the drying tower, are not easy to escape, and obtain the opportunity of further growing up and settling to the bottom of the tower.
The spray drying device of the invention is also provided with corresponding auxiliary equipment, such as: sight glasses, lighting lamps, etc. In use, the illumination lamp 63 is turned on, the control butterfly valve 38 is turned on when the product interface reaches the center of the viewing mirror 61 through the viewing mirror 61, and the product falls into the hopper 40 of the discharging machine 39. When the product interface reaches the middle upper part of the viewing mirror 61 again, the motor in the discharging machine 39 is started to discharge, when the product interface descends to the middle lower part of the viewing mirror 61, the motor is closed, the discharging is stopped, and the discharging is repeated.
The pressure hot air I interface of the invention is connected with an air compressor through a heating wire pipe, and the pressure hot air input by a common single-hole spray head arranged on the side wall of the rotational flow cavity 36 is connected with a fan through the heating wire pipe (not shown in the figure). Of course, a very small portion of the solid foamed concrete foaming agent is also obtained at the lower outlet of the cyclone connected to the external pipe connection (i.e., the centrifugal separation tank connection 66) of the fine particles and the air outlet 65.
The solid foam concrete foaming agent product obtained in the embodiment is easily soluble in water, the total dilution ratio is 1:450, and the pre-dilution ratio can be calculated according to the dilution ratio of a foaming machine during use and the following formula: pre-dilution factor = 450/dilution factor of the foaming machine.
The core technology of the invention lies in that the principle of angular momentum conservation is fully utilized, not only fluid enters along the tangential direction of the side wall of the atomizing nozzle, but also the proportion of the upper diameter and the lower diameter of the inner cavity of the nozzle is emphatically enlarged, and simultaneously, the angular momentum of the two fluids is equal in magnitude and opposite in direction by a method of enabling the rotating directions of the fluids to be opposite, and adjusting parameters such as the diameters (or the number) of the outlets of the common nozzles of the two fluids, the pressure and the flow rate of the fluids, so that the mixing of the two fluids is favorably strengthened, the side effect that the existing centrifugal nozzle only enables one fluid to enter the inner cavity of the nozzle along the tangential direction can be overcome, and the centrifugal nozzle has a positive effect on improving the fuel combustion performance and the driving force of rocke. Certainly, under the condition that an 'umbrella-shaped' spray column is needed, the single-fluid high-rotation-speed atomizing nozzle can be used for strengthening the effect of the 'umbrella-shaped' spray column, and the two fluids can also be rotated in the same direction by using the two-fluid high-rotation-speed atomizing nozzle to achieve the aim. Therefore, the examples listed in this specification are only for illustrating the present invention and should not be construed as limiting the present invention.
Claims (5)
1. A spray density measuring device, characterized in that: comprises a fixed plate (16), a movable square plate (17), a vertical column (18), a driving device (19) and a controller (20), a plurality of supporting leg bolts (21) are uniformly arranged at the bottom of the fixing plate (16), two guide rails (22) are arranged on the upper surface of the fixed plate (16) along the length direction thereof, two upright posts (18) are symmetrically arranged at the left side and the right side of the guide rail (22) in the middle of the upper surface of the fixed plate (16), scale marks (23) are arranged on the upright posts (18), a cross beam (24) is arranged between the two upright posts (18), the middle part of the cross beam (24) is fixedly provided with an atomizing nozzle (25) to be measured, the atomizing nozzle (25) to be measured can move up and down and back and forth on the two upright posts (18) along with the cross beam (24), the upright post (18) is also provided with a fixed locking device for fixing the horizontal position of the cross beam (24);
the movable square disc (17) is arranged on the two guide rails (22), a plurality of trapezoidal square cups (26) for receiving spray are uniformly arranged in the movable square disc (17) along the direction parallel to the guide rails (22) and the direction perpendicular to the guide rails (22), mist absorbing materials (27) are arranged in the trapezoidal square cups (26), the controller (20) and the driving device (19) are both arranged at one end of the fixed plate (16), a transmission device is connected between the driving device (19) and the movable square disc (17), and the movable square disc (17) can move back and forth on the two guide rails (22) under the combined action of the controller (20), the driving device (19) and the transmission device to realize the measurement of the spray density of the atomizing nozzle (25) to be measured;
the measuring method of the spray density measuring device comprises the following steps:
①, adjusting a plurality of leg bolts at the bottom of the fixing plate by using the level to make the fixing plate horizontal;
②, fixing the atomizing nozzle to be measured at the height of a scale a1n of the upright column, removing the trapezoidal square cup in the movable square plate, laying a layer of measuring paper Z1n at the bottom of the movable square plate, turning on the power supply of the controller, pressing a start button after selecting a blank gear, measuring the wetting size on the measuring paper Z1n in the direction vertical to the guide rail after the movable square plate is reset, and marking as the diameter D1n of the fog column at the scale a1n, wherein n is a positive integer;
③, rotating the atomizing nozzle to be measured in the step ② by 90 degrees and fixing the atomizing nozzle to be measured at the height of the scale a2n of the upright column, removing the trapezoidal square cup in the movable square plate, paving a layer of measuring paper Z2n at the bottom of the movable square plate, turning on the power supply of the controller, pressing a start button after selecting a blank gear, measuring the wetting size on the measuring paper Z2n in the direction vertical to the guide rail after the movable square plate is reset, and recording the wetting size as the diameter D2n of the fog column at the scale a2n, wherein n is a positive integer;
④, selecting a specific position of the atomizing nozzle to be measured on the scale mark as Km according to the measurement results of the diameter of the fog column in the step ② and the step ③, placing the trapezoidal square cups in the movable square disc according to the shape of the square matrix, and enabling the side length of the square matrix formed by a plurality of trapezoidal square cups in each row to be larger than the diameter of the fog column of the atomizing nozzle to be measured at the position, wherein m is a positive integer;
⑤, numbering the trapezoidal square cups with covers in the step ④ in sequence, weighing the trapezoidal square cups, recording the trapezoidal square cups with covers as Hi0 and Sj0, and then resetting the trapezoidal square cups after the covers are removed, wherein i is a column number and j is a row number;
⑥, turning on a power switch of the controller, placing a blank/measurement switch in a blank position, re-spraying, pressing a starting button after the spraying is stable, rotating a motor in the driving device forward, moving a movable square disc forward and leftward, after reaching a transition position, rotating the motor in the driving device reversely to return the movable square disc to the original position, stopping spraying, weighing the trapezoid square cup with a cover, and marking as Hi1 and Sj1, wherein i is a column number, and j is a row number;
⑦, resetting the trapezoidal square cup, then placing a blank/measurement switch of the controller at a measurement position, setting measurement time t, re-spraying, pressing a start button after the spraying is stable, rotating a motor in the driving device forward, moving a movable square disc forward and leftward, after reaching a transition position, rotating the motor in the driving device reversely to return to a sampling position, stopping the motor in the driving device, and starting timing;
⑧, when the set time t is reached, starting a motor in the driving device and continuing to rotate reversely, simultaneously switching on the laser receiver I, when the movable square disc returns to the original position, stopping spraying, closing the power supply of the controller, covering the cover of each trapezoidal square cup, weighing each trapezoidal square cup with a cover, and marking as Hi2 and Sj2, wherein i is a column number, and j is a row number;
⑨, calculating density distribution conditions △ Hi and △ Sj of the fog column on the Km section by using formulas △ Hi = (Hi 2-2 (Hi 1-Hi 0))/t and △ Si = (Si 2-2 (Si 1-Si 0))/t;
⑩, calculating and counting the density distribution data on the Km section when m is a positive integer, and drawing two radial density distribution curves of the measured fog column perpendicular to each other.
2. The spray density measuring apparatus according to claim 1, wherein: the fixing plate (16) is also provided with a water level (59).
3. The spray density measuring apparatus according to claim 1, wherein: the mist absorbing material (27) is inorganic salt which is not moisture-absorbing at normal temperature and normal pressure.
4. The spray density measuring apparatus according to claim 1, wherein: a layer of fog absorbing substrate (46) is laid at the part of the movable square disc (17) where the trapezoidal square cup (26) is not arranged.
5. The spray density measuring apparatus according to claim 4, wherein: the material of the fog absorbing substrate (46) is any one of polyacrylic acid glycerol polycondensate, asbestos cloth impregnated solid paraffin or calcium carbonate powder impregnated solid paraffin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610849518.1A CN107328688B (en) | 2016-05-12 | 2016-05-12 | Spray density measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610311620.6A CN105750111B (en) | 2016-05-12 | 2016-05-12 | Spray drying device |
| CN201610849518.1A CN107328688B (en) | 2016-05-12 | 2016-05-12 | Spray density measuring device |
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| CN201610311620.6A Division CN105750111B (en) | 2016-05-12 | 2016-05-12 | Spray drying device |
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| CN107328688B true CN107328688B (en) | 2020-04-14 |
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| CN108450446A (en) * | 2018-04-11 | 2018-08-28 | 朱子中 | Electronic antomobile sprayer |
| CN110976114A (en) * | 2019-11-20 | 2020-04-10 | 中国航天空气动力技术研究院 | Single-path multi-rotation adjustable centrifugal fluid jet device |
| CN110904788B (en) * | 2019-12-11 | 2021-09-10 | 河南和兴工程建设有限公司 | Highway construction is with pitch laying device that has stirring function |
| CN110918280B (en) * | 2019-12-18 | 2021-09-10 | 江西金酷科技有限公司 | Cleaning device for stamping die or clamp |
| CN112048330B (en) * | 2020-09-01 | 2021-09-10 | 北京奥博斯工程技术有限公司 | Process and device for reducing coke powder of delayed coking fractionating tower |
| CN112264209B (en) * | 2020-09-18 | 2022-06-10 | 西北工业大学 | Spiral pipe type air atomizing nozzle |
| CN113800680B (en) * | 2021-09-30 | 2023-08-25 | 维尔利环保科技集团股份有限公司 | Reactor and method for treating landfill leachate membrane concentrate based on same |
| CN114526874B (en) * | 2022-04-24 | 2022-07-01 | 江苏恩沃智能制造有限公司 | Nozzle delivery detection tool |
| CN115254474B (en) * | 2022-07-26 | 2023-07-04 | 西安交通大学 | Caliber-adjustable nozzle structure and adjusting method |
| CN116703913B (en) * | 2023-08-07 | 2023-10-24 | 山东大拇指喷雾设备有限公司 | Spraying quality detection method of sprayer |
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| CN107328688A (en) | 2017-11-07 |
| CN105750111A (en) | 2016-07-13 |
| CN105750111B (en) | 2017-05-10 |
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