CN2460224Y - Ultrasonic atomizing nozzle structure of humidifier - Google Patents

Abstract

A sonic atomizing nozzle structure for humidifier is composed of spray tube, spray head and resonator, in which the spray head can be fixed by the front or back end of spray tube, the resonator is arranged in front of spray head and keeps proper resonant height with it, when liquid airflow is in spray head, high-pressure airflow is sprayed from spray head to impact the resonator to generate sonic vibration, and then the vibration energy of sonic vibration is used to excite the liquid film to be unstable to generate good atomizing action, the resonator can be additionally provided with a conic column, its end face can be equipped with one or more shallow grooves, and the conic column can be screwed on the resonant rod and fixed by screw cap, and the resonant height can be changed by the fore-and-aft regulation of conic column to obtain optimum atomizing effect.

Description

Ultrasonic atomizing nozzle structure of humidifier

The utility model relates to an ultrasonic atomizing nozzle structure of a humidifier.

The main purpose of "atomization" is to break a quantitative volume of liquid into many small droplets through an atomization device, which is used to increase the ratio of the surface area to volume of the droplet (Surface to Volume Ratio) to increase the quality and The exchange rate between heat. The use of atomizers has been widely used in industrial combustion furnaces, fuel injection equipment for gasoline and diesel vehicles and turbine engines, and many industrial processes such as soot manufacturing, painting, spray drying, powder metallurgy, etc., and even agricultural spraying Insecticides and environmentally friendly exhaust gas control and dust removal devices. There are many ways of atomization, but the main key is that there needs to be a relatively high relative velocity (Relative Velocity) between the atomized medium and the surrounding environment to achieve the effect of breaking the atomized medium.

In order to meet the needs of various atomization effects, many atomizers with different design concepts have been derived. For easy understanding, please refer to the accompanying drawings 16-A, 16-B, and 16-C, which include 1. Pressure type Pressure Atomizer; 2. Twin-fluid Atomizer; 3. Rotary Atomizer; In addition, there are other atomizers using different principles. Such as atomizers that use static electricity to atomize liquids, and atomizers that use sound waves or ultrasonic vibrations to atomize liquids.

The aforementioned pressure atomization, double-flow atomization, rotary atomization, and electrostatic atomization require the cooperation of jet flow or high-speed rotating machinery or electrostatic devices to obtain a good atomization effect, and the material of the nozzle must be highly resistant to friction, so Increased investment costs; and the ultrasonic atomizer does not have this shortcoming, so this utility model is aimed at the research and development of the sonic atomizer to obtain a good atomization effect.

According to the sonic nebulizer, the frequency of the supersonic airflow is 0.016 ~ 20kHz, and the vibration energy is used to atomize the liquid. Therefore, the sonic nebulizer must be a gas-assisted nebulizer. However, the working principle of the sonic nebulizer is different from that of the traditional air-assisted (Air-Assist) nebulizer. Atomization energy comes from the kinetic energy of gas movement. Therefore, the atomization quality and uniformity of the sonic nebulizer are better than the traditional gas-assisted nebulizer.

Of course, the sonic nebulizer does not use the sound to directly generate liquid droplets, but uses the vibration energy of the sound to stimulate the instability of the liquid film, and then produces the effect of atomization; the sonic nebulizer usually needs a resonant cavity that generates sound. This resonance cavity is not found in traditional atomizers, and a typical example of a sound resonance cavity is shown in Figure 17. The Hartmann generator, when the high-speed airflow is ejected from the nozzle, it hits the front resonance cavity , will produce sound frequency vibration, and its frequency is related to the diameter d of the resonant cavity, the depth h of the resonant cavity and the distance L between the nozzle and the resonant cavity.

Recently, some scholars have done research on the Hart slow sound generator. For example, [Study on Ultrasonic Atomizer for Flue Gas Desulfurization ~ Zhang Yongzhao] published in the ninth issue of Volume 8 of Taiwan's "Chemical Technology", found that it is sprayed from the nozzle. After the air velocity of the air flow exceeds the speed of sound, the air pressure distribution will have a certain periodicity; if the air pressure of the air flow is measured at different distances from the nozzle, it will be found that the periodic structure of the air pressure distribution has a certain space interval, and these high pressure intervals are the air flow Placing a cavity resonator on this indeterminate point will make the air vibrate to form an air wave, and generate ultrasonic waves in front of the resonator mouth. Ultrasonic waves have a crushing effect on liquid droplets. When ultrasonic waves propagate in liquids, they can arouse strong acoustic vibrations and produce cavitation, causing the entire medium to explode and turn into liquid droplets. The droplets are atomized finer and better than traditional atomization.

In addition to the sound frequency generated by the interaction of the gas in the resonant cavity, the liquid flowing out of the sonic nebulizer must also have a filming (Prefilming) mechanism, because the film can only generate unstable shock waves when excited by sound waves, and atomize into tiny of droplets.

The purpose of this utility model is to provide an ultrasonic atomizing nozzle structure of a humidifier, which adopts a fluid impact type, and increases the vibration frequency of the gas to the ultrasonic range, so as to achieve the purpose of high atomization.

In order to achieve the above object, the utility model adopts the following technical scheme: the sonic atomization nozzle structure of this humidifier is composed of a nozzle, a nozzle and a resonator, wherein the nozzle has an axial hole, and the nozzle It is installed in the axial hole of the nozzle. The nozzle has an axial air flow channel and several radial liquid flow channels. The resonator is fixed on the nozzle and placed in front of the nozzle. The resonator is approximately "D". A metal rod with a round diameter in the shape of a font, one end is a fixed rod fixed at the front end of the nozzle, and the other end is a horizontal resonance rod that is located in front of the nozzle of the nozzle and maintains concentricity with the nozzle, and a connecting rod extends from the rear of the resonance rod , the connecting rod is integrally connected with the fixed rod fixed at the front end of the nozzle; a proper resonance height is maintained between the aforementioned resonance rod and the nozzle, and the diameter of the end surface of the resonance rod is larger than the diameter of the nozzle of the nozzle.

Below in conjunction with accompanying drawing, the utility model is further described.

Fig. 1 is a three-dimensional exploded view of the sonic atomizing nozzle of the present invention.

Fig. 2 is a three-dimensional assembled view of the sonic atomizing nozzle in Fig. 1 .

Fig. 3 is a sectional view along line 3-3 of Fig. 1 .

Fig. 4 is a sectional view of line 4-4 in Fig. 2 .

Fig. 5 is a cross-sectional view of another type of resonant rod used in the sonic atomizing nozzle of the present invention.

Fig. 6 is a full sectional view of the nozzle used in the acoustic atomizing nozzle of the present invention.

Fig. 7 is a full sectional view of the nozzle used in the acoustic atomizing nozzle of the present invention.

Fig. 8 is a full sectional view of the nozzle used in the acoustic atomizing nozzle of the present invention.

Fig. 9 is a sectional view taken along line 9-9 of Fig. 6 .

Fig. 10 is a full sectional view of another acoustic atomizing nozzle of the present invention.

Fig. 11 is a full cross-sectional view of the resonator of the acoustic atomizing nozzle of the present invention with cone columns added.

Fig. 12 is a table showing the variation of the average spray particle size of the acoustic atomizing nozzle of the present invention with the height of the resonator.

Fig. 13 is the average particle diameter of the spray of the utility model sonic atomizing nozzle in the state of the conical column.

Table of changes in vibrator height.

Fig. 14 is another three-dimensional cone-column diagram of the utility model.

Fig. 15 is the spray average of the utility model sonic atomizing nozzle using the fourteenth cone column state

Table of particle size variation with resonator height.

Figure 16-A is a structural schematic diagram of several pressure type nozzles in the prior art

Figure 16-B is a schematic structural view of several dual-fluid nozzles in the prior art

Figure 16-C is a structural schematic diagram of several rotary nozzles in the prior art

As shown in Figures 1 and 2, the sonic atomizing nozzle 10 of the present utility model is composed of a nozzle 20, a nozzle 30, and a resonator 40, wherein the nozzle 20 has a stepped axial hole 21 , there is a radial screw hole 22 vertically passing through the hole groove 21 on the side of the nozzle 20, and a radial screw hole 22 that is screwed into and fixed on the bracket 80 for the bolt 81 (as shown in Figure 3 ) on the other side. Hole 23. Secondly, a radial concave hole 24 is provided on the outer wall of the front end of the nozzle 20, and an axial screw hole 25 passing through the concave hole 24 is provided on the end wall of the front end, wherein the concave hole 24 can provide a D-shaped rod-shaped resonance The straight leg 41 of the resonator 40 is penetrated, and then the small bolt 82 is screwed into the screw hole 25 to press the straight leg 41 so that the resonator 40 is fixed on the nozzle pipe 20 .

Fig. 4 shows the 4-4 cross-sectional view of Fig. 2. In the figure, the axial hole groove 21 of the nozzle pipe 20 is revealed, and the screw hole 211 at the rear end can be screwed to the connector 60, and then connected to the airflow conduit 61 through the connector 60. The source is from the air compressor. The nozzle 30 is penetrated by the front end of the axial hole 21, and then the rear end coil 31 is screwed with the screw hole 211 at the rear end of the hole 21, and the concentricity is kept without eccentricity; the radial screw hole 22 of the nozzle pipe 20 The cover 70 can be screwed, and then connected to the liquid flow conduit 71 through the connector 70 .

When the aforementioned nozzle 30 has no resonator 40, the average particle diameter after atomization is relatively high, the distribution of the number of particles is biased towards large particles, and the spray cone angle is within the range of θ1 (as shown in Figure 4), which is suitable for industrial humidification. And can not achieve the best effect. Yet after a resonator 40 is set before the nozzle 30, the supersonic velocity airflow produced to the resonator rod 42 of the resonator 40 after the high-pressure airflow is ejected, its vibration frequency can be at 0.016, 20kHz, and the energy of this vibration can be used for The average particle size SND produced by the atomization of the liquid (refer to Appendix 1) is relatively low, the distribution of the number of particles is biased toward r particles, and the spray cone angle W2 is greater than W1, so the crystal quality of the atomization is better and the dispersion range is wider .

The structure of the above-mentioned resonator 40 includes: a horizontal resonant rod 42 positioned on the same central axis in front of the nozzle 37 of the nozzle 30, a fixed rod fixed on the front end of the spray pipe 20 (a straight leg 41 in the figure), a connection The straight leg 41 and the connecting rod 43 of the resonant rod 42 are formed. The connecting rod 43 disclosed in the drawing is semi-circular and the upper end extends horizontally. On the whole, it is approximately a "D" shape. Secondly, it is better to position the connecting rod 43 at the top than below, because if the connecting rod 43 is positioned at the bottom, it is easy to condense water droplets. In order to avoid this shortcoming, as long as the connecting rod 43 is positioned at the top, this shortcoming can be overcome. Secondly, the resonator 40 is a metal rod whose rod diameter is D, and the diameter D of the end face of the resonator rod 42 must be greater than the diameter of the spout 37, because the liquid will expand after being sprayed out. If the diameter D is too small, it cannot cover the entire liquid. column, forming an effective atomization effect. Furthermore, the height H between the end face of the resonator rod 42 and the nozzle 37 will change the aerodynamic characteristics of the flow field. Basically, the increase in the height H of the resonator increases the ejection efficiency of the gas, so there is a relatively high gas flow rate. The quality of atomization is also improved; therefore, as long as the height H of the resonator is properly controlled, the resonator can produce a good atomization effect, so even at lower pressures, its atomization characteristics will not be better than high-pressure operation The conditions are poor, because the gas-liquid pressure difference is the same, the gas-liquid mass ratio is close, and the atomized crystal quality is also similar.

In order to properly adjust the height H of the resonator, the resonator can be slightly improved. For example, the rear end of the resonance rod 40 shown in FIG. The rear end of the connecting rod 43 is bent into an L-shape, and the horizontal foot 41' penetrates through the axial concave hole 24' of the end wall of the nozzle 20, and then is tightened by the bolt 82 in the radial screw hole 25', Since the horizontal leg 41' can have a telescopic effect in the concave hole 24', the height H of the resonator can be adjusted appropriately to achieve the best atomization effect.

The aforementioned nozzle 30 has three types, as shown in Figure 6-Figure 8, three kinds of nozzles are all fluid impact nozzles, wherein, the air flow channel 32 in the nozzle 30 of Figure 6 is straight from the rear end to the front end, and connects with the neck Two to four liquid flow channels 33 (as shown in FIG. 9 ) of the portion 34 are vertically intersected, and the aperture of the air flow channel 32 is larger than the liquid flow channel 33 . Figure 7 reveals that the airflow channel 32 can be divided into two stages of different apertures, the rear airflow channel 321 has a larger aperture than the front airflow channel 322, and the front and rear airflow channels and the liquid flow channel 33 can meet at one point as shown in Figure 8 In the front and rear air flow channels 321 and 322, the front air flow channel 322 and the liquid flow channel 33 of the small diameter meet; the water liquid in the air flow channel 33 can be mixed with the liquid flow channel 33 after the aforementioned three nozzles can enter the air flow channel 32 by high-pressure air, and Forms a fluid impingement film. Furthermore, in order to avoid leakage between the nozzle 20 and the nozzle 30, the vertical wall surfaces of the front and rear ends 35, 36 of the neck 34 of the nozzle can cooperate with the O-shaped leak-proof ring 84, and press against the vertical wall of the nozzle 20. Contact produces a leak-stopping effect.

The liquid and gas flow rates can be controlled respectively by the liquid flow hole 33 size and the air flow hole 32 (or 322) in the shower head 30. The gas flow rate of the nozzle does not have much difference. This is because the volume of the liquid accounts for only one thousandth of the gas, so the volume of the mixing chamber of the nozzle is roughly occupied by the gas, so the increase of the liquid flow rate has no effect on the gas flow rate. What an impact.

Fig. 10 shows another kind of sonic atomizing nozzle structure of the utility model, reveals the combination relation of nozzle 30 and nozzle 20 in the figure, and its difference with aforementioned Fig. 4 is that nozzle 30 is formed by the axial hole of nozzle 20 The end of the groove 21 penetrates inside and then the rear end spiral ring 38 is screwed and fixed with the screw hole 26. It is obvious that there are two ways to cooperate with the nozzle pipe 20 and the nozzle 30.

As shown in Figure 11, it is revealed that a cone column 44 is added at the end of the resonator rod 42 of the resonator 40, the cone column and the spout 37 are on the same center line, and the diameter of the end face is still D, which is greater than the diameter of the spout; The spray flow field after the column is implemented is also an expansion type spray, but the spray diameter is smaller than the implementation of the aforementioned garden rod resonant rod 42, the atomization cone angle θ3 is greater than θ2, and the height H of the resonator is higher than the aforementioned operating height. With greater operating flexibility, it can be operated in a relatively large range, and can obtain a very ideal atomization effect. Also therefore in order to adjust the height H of the resonator, the end of the resonant rod 42 can be changed into a screw 421, and the rear end of the tapered column 44 is provided with a screw hole 441 to facilitate the screw 421 to be screwed in, and the screw 421 can be screwed in by screwing the nut 45. The cone column 44 is fixed on the end of the screw rod 421 .

Fig. 12 shows the variation table of the spray average particle diameter (SMD) of the utility model sonic atomizing nozzle with the height of the resonator, the nozzle 30 nozzle 37 aperture in the experiment is 2.0MM, and the aperture 1.0MM of fluid channel 33 * 2 , the chart reveals that in the case of water pressure Pw=5Kg/cm ² and air pressure Pw=6Kg/cm ² , its gas-liquid mass ratio ^ma /m ^w =3.93, then its SMD changes from H=2.0 with the height of the resonator SMD=10.57/μm at MM, increased to SMD14.36μm at H=3.0MM. Obviously, the atomization characteristics of this type of nozzle are very sensitive to the resonator height H. When the resonance height is controlled at 2.0mm, the best atomization effect can be obtained, but if the resonator height deviates too much from this operating point, the atomization characteristics will deteriorate. Because of the lack of a good atomization mechanism at this time.

Fig. 13 shows the change table of the spray average particle diameter of the utility model sonic atomizing nozzle with the height of the resonator. The structure of the nozzle 30 in the experiment is the same as the above, but the resonator 40 has been equipped with a cone column 44. When the water pressure Pw=5Kg /cm ² , under the condition of air pressure Pw=6Kg/cm ² , the gas-liquid mass ratio is 3.93, and the SMD changes with the height of the resonator from SMD=10.58μm when H=3.0MM to SMD when H=7.0MM =12.64μm, showing that its atomization quality is quite good. It is found from the experimental results that the spray flow field at this time is an expansion spray, which is conducive to the application of humidification. It is worth noting that the operating height of this type of resonator is obviously more flexible than the operating height of the original resonator, and it can be operated in a considerable range to obtain a rather ideal atomization effect. This is because this type of resonator An atomizing mechanism (i.e. cone column 44) has been installed.

Fig. 14 shows another kind of three-dimensional cone diagram, wherein the surface of the cone 44 has a shallow concave groove 442, and the experimental results according to Fig. 15 show that the atomization quality is also quite good, but because the end face of the resonator is an asymmetric shape, so The distribution of the spray is also asymmetrical. This type of resonator can be used in the project of rectangular pipes. Because the operating height of this type of resonator has greater operating flexibility, it can be operated uniformly in a considerable range. Get quite ideal atomization effect. Similarly, multiple shallow concave grooves 442 such as crosses or Pozi characters can also be formed on the end surface of the tapered column 44, and then provided for different purposes and engineering uses.

It can be seen from the above that after the nozzle is equipped with a resonator, it can atomize the liquid by the resonance of the gas in the resonator, but it is quite sensitive to the height H of the resonator. Therefore, as long as the appropriate height H of the resonator is controlled, the resonator Atomization effect is generated, even at low pressure, good atomization effect can be obtained; and after the resonator is equipped with a cone column, ideal atomization effect can be obtained within a considerable range of operating heights.

The utility model has the advantage that: through the atomization of the utility model, as long as an appropriate resonance height is controlled, a good atomization result can be obtained at a relatively low pressure. In addition to reducing the average particle size of spray particles, an excellent amount of atomized air can also be obtained.

Claims (7)

1, a kind of sound wave atomizing nozzle structure of humidifier, it is made up of jet pipe, shower nozzle, resonator, wherein, jet pipe has longitudinal slot, and shower nozzle is that device is in the longitudinal slot of jet pipe, have axial flow duct and several radial flow of liquid duct in the shower nozzle, resonator is to be fixed on the jet pipe and to be located at before the shower nozzle again, it is characterized in that:

The circle footpath metallic rod of approximate " D " font of resonator system, wherein an end is the fixed bar that is fixed on the jet pipe front end, and end is that horizontal resonance bar and position keep concentricity with spout before the spout of shower nozzle in addition, and the resonance bar after extend a connecting rod, this connecting rod also is connected with the fixed bar one that is fixed on the jet pipe front end; Keep one suitably to resonate highly between aforementioned resonance bar and the spout, and resonance rod end surface diameter is greater than the nozzle diameter of shower nozzle.

2, the ultrasonic atomizing nozzle structure of humidifier according to claim 1, it is characterized in that: the fixed bar of described resonance bar is a straight-bar, and can penetrate in the radially shrinkage pool of jet pipe front end, and the jet pipe front end hang down wall have an axial screw and with the radial perforation intercommunication, in axial screw, can be screwed into a bolt and the bar that will resonate is fixed.

3, the ultrasonic atomizing nozzle structure of humidifier according to claim 1, it is characterized in that: the fixed bar of described resonance bar is a horizon bar, and be bent into L shaped by connecting rod end, horizon bar can penetrate that the jet pipe front end hangs down in the axial shrinkage pool of wall and jet pipe front end outer wall have one radially screw and with the axial through bore intercommunication, in screw radially, can be screwed into a bolt and the bar that will resonate is fixed.

4, according to the ultrasonic atomizing nozzle structure of claim 2 or 3 described humidifiers, it is characterized in that: described resonance bar is held to the greatest extent and can be fixed an awl post, and the end face diameter of awl post is greater than the nozzle diameter of shower nozzle.

5, the ultrasonic atomizing nozzle structure of humidifier according to claim 4 is characterized in that: described resonance bar is held to the greatest extent and can be set as screw rod, and the awl post is provided with a screw to screw togather with screw rod, can set up a nut again on the screw rod and fix will bore post.

6, the ultrasonic atomizing nozzle structure of humidifier according to claim 1 is characterized in that: described shower nozzle can be screwed into by the front end of the longitudinal slot of jet pipe and fixing, and keeps concentricity between the two.

7, the ultrasonic atomizing nozzle structure of humidifier according to claim 1 is characterized in that: described shower nozzle can be screwed into by the rear end of the longitudinal slot of jet pipe and fix it, and keeps concentricity between the two.

Images