JP2014144434A - Electrically-driven wet atomizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrically-driven wet atomizer usable even in a simple laboratory by a power source of 100 V in a small type, by using an electric motor as a driving source, without hydraulic driving.SOLUTION: The wet atomizer is provided for sucking, pressurizing and discharging a liquid raw material in a cylinder by reciprocating motion of a plunger for reciprocatably moving in the cylinder by a power transmission mechanism for converting reverse rotary motion of this driving source into reciprocating motion with the electric motor as the driving source, and the power transmission mechanism is a high efficiency screw mechanism having a plurality of rolling elements interposed between screw shaft parts for converting rotary motion of a nut part for making the reverse rotary motion into the reciprocating motion, and the driving source is a hollow servomotor for advancing-retreating the plunger in the rotary shaft direction of the nut part via the screw shaft parts of penetrating through this hollow part, by reversely rotating the nut part of a screw mechanism arranged in the hollow part of a rotor.

Description

  The present invention relates to a small electric wet atomization apparatus that can be used even with a general AC voltage of 100 V, and relates to an electric wet atomization apparatus that can easily remove a high-pressure packing or the like when changing raw materials or cleaning.

  The wet atomization device pressurizes the raw material to a high pressure of 245 MPa with a water jet and causes high-speed injection from a fine nozzle having an injection port diameter of 0.05 to 0.5 mm, thereby colliding particles with each other or a hard member. The secondary agglomerated particles are mainly crushed and dispersed by the shearing force generated by passing through the nozzle and the counter flow, and the impact force by jet cavitation (see, for example, Patent Document 1). .

  In such a wet atomization apparatus, in order to obtain a high pressure as high as 245 MPa, a booster type (pressure increase type) using a hydraulic drive has been conventionally used. However, in order to prevent contamination, the atmosphere itself in which the driving oil is used tends to be disliked. As such a pulverizing apparatus, a pulverizing apparatus aiming at miniaturization using a motor as a drive source has already been proposed (for example, see Patent Document 2).

Japanese Patent No. 3151706 Japanese Patent No. 2897915

  However, although a factory power supply of 200V is normally used as a power source for hydraulic drive or the like, there is a case where there is no 200V power supply in a simple laboratory, and it is necessary to newly install a 200V power supply in use. If it can be driven by a 100V power supply, it will be easy to install an experimental device for atomization equipment that is often used for research purposes.

  Further, some conversion mechanisms from the rotational drive of the motor to the direct movement of the plunger use a ball screw, or the motor and the plunger are arranged in parallel and connected by a timing belt. For example, when the apparatus component is small in an experimental machine, there is a problem that the allowable torque and allowable thrust of the ball screw are reduced. When the two shafts are connected by a timing belt, there is a problem that an installation area is increased and power transmission efficiency is deteriorated.

  Further, the high-pressure seal packing must be replaced at the time of changing the raw material or cleaning, but the high-pressure seal packing is firmly incorporated in the plunger and the high-pressure cylinder, so that it is difficult to disassemble and replace them.

  In addition, when pulling out the high-pressure cylinder with built-in packing from the plunger, it is necessary to strike the high-pressure cylinder to the side to be pulled out with a hammer or use a special pull-out jig, which may damage the plunger when pulling out the cylinder. There was also.

  The present invention eliminates these conventional disadvantages and provides a small-sized electric wet atomization apparatus. In other words, electric wet type atomization that uses an electric motor instead of a hydraulic drive as a drive source, is compact, can be used in a simple laboratory with a 100 V power supply, and facilitates replacement work of the high-pressure packing built into the cylinder. The object is to obtain a device.

An electric wet atomization apparatus according to a first aspect of the present invention includes a power transmission mechanism that converts a forward / reverse rotational motion of a driving source into a reciprocating motion using an electric motor as a driving source, and a reciprocating motion in a cylinder by the power transmitting mechanism. A wet atomization device comprising a plunger that moves, and a drive control means that controls the reciprocating motion of the plunger, and sucks, pressurizes, and discharges the liquid material into the cylinder by the reciprocating motion of the plunger;
The power transmission mechanism includes a nut portion that performs forward / reverse rotational motion, a screw shaft portion that converts the rotational motion of the nut portion into reciprocating motion, and a plurality of rolling elements interposed therebetween, and a high-efficiency screw. Mechanism,
The drive source rotates the nut portion of the screw mechanism disposed in the hollow portion of the rotor forward and backward, and advances the plunger in the direction of the rotation axis of the nut portion through a screw shaft portion that passes through the hollow portion. -It is a hollow servo motor that moves backward.

  An electric wet atomization apparatus according to a second aspect of the invention is characterized in that the high-efficiency screw mechanism according to the first aspect is a roller screw mechanism in which the rolling element is a roller. .

In the electric wet atomization apparatus according to the invention described in claim 3, a high-pressure packing seal material is disposed at a cylinder rear end portion where the plunger according to claim 1 or 2 enters and exits,
The last driving position of the plunger is a position where the tip of the plunger is disengaged from the high pressure packing.

  An electric wet atomization apparatus according to an invention described in claim 4 is the electric wet atomization apparatus according to any one of claims 1 to 3, wherein the boosted back end position of the plunger is detected as an origin. An origin position detection sensor that detects the angle of the screw shaft portion of the high-efficiency screw mechanism, and the drive control means detects the origin position detection sensor before starting the reciprocating motion of the plunger. When the rotational angle detection sensor detects a predetermined boosting forward end position and boosting backward end position, the position detected by the above is changed to the origin, and the rotation direction of the hollow servomotor is switched to supply the liquid material into the cylinder. Is sucked, pressurized and discharged.

  The electric wet atomization apparatus according to the invention described in claim 5 is the electric wet atomization apparatus according to any one of claims 1 to 4, wherein the drive source is an electric motor driven at a voltage of 100V. Yes, the liquid raw material is pressurized and discharged at a maximum pressure of 245 MPa.

  The present invention uses an electric motor, not a hydraulic drive, as a drive source, is small, can be used in a simple laboratory with a 100 V power supply, and facilitates replacement work of a high-pressure packing incorporated in a cylinder. There is an effect that an atomization apparatus can be obtained.

It is a block diagram which shows the structure of one Example of the electric wet atomization apparatus of this invention. It is a schematic diagram of the pressure waveform by repetition of suction and pressurization discharge by the specification of the electric wet atomization device of FIG. It is a diagram which shows the measurement result of the voltage output value by repetition of attraction | suction and pressurization discharge of the electric wet atomization apparatus of FIG. It is a diagram which shows the measurement result of the pressure value by repetition of attraction | suction and pressurization discharge of the electric wet atomization apparatus of FIG. It is an example of the relationship between the electric current value of the electric wet atomization apparatus of FIG. 1, and injection pressure. It is a diagram which shows the measurement result of the pressure value by repetition of attraction | suction and pressurization discharge when the plunger diameter of the electric wet atomization apparatus of an Example is made small.

In the present invention, using a motor as a drive source, a power transmission mechanism that converts forward / reverse rotational motion of the drive source into reciprocating motion, a plunger that reciprocates within the cylinder by the power transmission mechanism, and reciprocating motion of the plunger are controlled. A wet atomization device that sucks, pressurizes, and discharges the liquid material into the cylinder by reciprocating movement of the plunger,
The power transmission mechanism includes a nut portion that performs forward / reverse rotational motion, a screw shaft portion that converts the rotational motion of the nut portion into reciprocating motion, and a plurality of rolling elements interposed therebetween, and a high-efficiency screw. Mechanism,
The drive source rotates the nut portion of the screw mechanism disposed in the hollow portion of the rotor forward and backward, and advances the plunger in the direction of the rotation axis of the nut portion through a screw shaft portion that passes through the hollow portion. -A hollow servo motor that moves backward. For this reason, an electric motor is used as a drive source instead of a hydraulic drive, and it is small and can be used in a simple laboratory or the like with a 100 V power source.

  That is, since the primary drive source is not hydraulic but an electric motor (servo motor), it is not necessary to consider the prevention of contamination by hydraulic drive oil even in pharmaceutical manufacturing and precision electronic component manufacturing. Further, by adopting a power transmission mechanism, particularly preferably a high-efficiency screw mechanism, a high pressure output up to a maximum pressure of 245 MPa can be obtained with a general power supply of 100V. For this reason, there is an advantage that installation is easy even in a driving place where there is no 200 V power supply, particularly in a simple laboratory. Moreover, power efficiency can be improved by providing a high-efficiency screw mechanism as a power transmission mechanism.

  As the power transmission mechanism, for example, it is assumed that the two shafts are connected by a timing belt. However, since the installation area becomes large and the power transmission efficiency also deteriorates, a ball screw mechanism, a roller screw mechanism, etc. The high-efficiency screw mechanism is suitable, and a roller screw mechanism in which the rolling element is a roller is more suitable.

  Specifically, when the apparatus component is small in the experimental machine, the allowable torque and the allowable thrust are reduced in the ball screw mechanism. A roller screw mechanism was used to meet the required torque and required thrust in a small size. Specifically, the roller screw mechanism was attached to the inside of the hollow servo motor, the nut portion of the roller screw mechanism was rotated inside the motor, and the screw shaft portion (shaft) was moved forward and backward.

  In addition, in the present invention, a hollow servomotor is employed as a drive source. This hollow servomotor rotates an inner cylinder having a hollow portion therein, and a central screw shaft portion moves forward and backward by rotating a nut portion of a roller screw attached to the hollow cylinder. By connecting a plunger that generates high pressure to the shaft of the screw shaft portion, it is switched to the longitudinal movement of high pressure generation.

  In the present invention, the high pressure packing seal material is disposed at the rear end of the cylinder where the plunger enters and exits, and the plunger driving end position is set to a position where the plunger tip is disengaged from the high pressure packing. Since the plunger can be separated from the cylinder by moving the plunger to the drive end position (= disassembly end position) by the drive control means, the high pressure cylinder can be removed from the plunger without using a jig. The high-pressure packing can be easily removed during replacement or cleaning, and the plunger is not damaged.

  When installing, after attaching the high-pressure cylinder incorporating packing at the disassembly end position of the plunger to the main body, the plunger is advanced, and the plunger is inserted into the inner diameter of the high-pressure packing by the thrust of the motor. It becomes possible to install.

  The electric wet atomization apparatus of the present invention sucks liquid material into the cylinder by reciprocating movement of the plunger, pressurizes it, and discharges it. In this case, the reciprocating motion of the plunger is the reciprocating motion between the boosting forward end position and the boosting rear end position of the plunger, and the position control of the plunger is performed by the drive control means. Here, drive control means and position control will be described. The drive control means includes a sequencer and a servo amplifier, and commands the target position of the plunger from the sequencer to the servo amplifier. The target position referred to here is the boosting forward end position, the boosting backward end position, and the disassembly end position of the plunger.

  The drive control means recognizes the origin serving as the reference for position control by the origin position detection sensor that detects the boosted back end position of the plunger as the origin before the reciprocating movement of the plunger, and rotates the commanded target position and the high-efficiency screw mechanism. The position of the plunger is controlled by comparing the current position detected by a rotation angle detection sensor that detects the angle of the shaft. By controlling the position of the plunger in this way, the liquid material can be reliably sucked into the cylinder, pressurized and discharged.

  The rotation angle detection sensor can recognize the current position of the plunger by detecting the angle of the rotation shaft of the high efficiency screw mechanism. Examples of the rotation angle detection sensor include an encoder and a resolver. By connecting the output of the resolver to a sequencer and combining them, an analog output is possible, which is highly resistant to noise.

  Moreover, in the electric wet atomization apparatus of this invention, what is necessary is just to obtain | require an injection pressure from the electric current value (voltage display) of a motor load.

  FIG. 1 is a configuration diagram showing the configuration of an embodiment of the electric wet atomization apparatus of the present invention. As shown in FIG. 1, the electric wet atomization apparatus 10 of this embodiment includes a hollow servomotor 1 as a drive source and a high-efficiency screw as a power transmission mechanism that converts the forward / reverse rotational motion of the hollow servomotor 1 into reciprocating motion. A roller screw mechanism 5 of the mechanism, a plunger 8 reciprocating in the high pressure cylinder 6 by the roller screw mechanism 5, a sequencer 14 and a servo amplifier 15 as drive control means for controlling the reciprocating motion of the plunger 8, By reciprocating the plunger 8, the liquid material is sucked into the high pressure cylinder 6 from the liquid suction port 11, pressurized, and discharged from the discharge port 12.

  The specifications of the hollow servomotor 1 are a drive voltage of 100 V, a drive current of 15 A, and a drive output of 1.5 kW. Since the roller screw mechanism 5 is adopted as the power transmission mechanism, the power transmission efficiency is increased, and a high-pressure output can be obtained even in the hollow servomotor 1 driven at 100V.

  Specifically, the roller screw mechanism 5 has a higher power transmission efficiency than the ball screw mechanism of the same high efficiency screw mechanism, and even in the hollow servo motor 1 driven at 100 V, a high pressure output with a maximum pressure of 245 MPa is achieved. can get. Needless to say, if the maximum pressure does not require 245 MPa, a ball screw mechanism that is the same high-efficiency screw mechanism may be adopted instead of the roller screw mechanism 5.

  Further, the hollow servomotor 1 rotates the nut portion 3 of the screw mechanism disposed in the hollow portion 2 of the rotor in the forward and reverse directions, and the screw shaft portion 4 penetrating the hollow portion is a rotation shaft of the nut portion 3. It is a motor that moves forward and backward in the direction. As a result, the installation area can be reduced without using a mechanism that connects two shafts with a large force loss for downsizing with a timing belt, resulting in better power transmission and downsizing. We were able to.

  The electric wet atomization apparatus 10 of the present embodiment sucks and pressurizes the liquid raw material into the cylinder 6 from the liquid suction port 11 into the high pressure cylinder 6 by the reciprocating motion of the plunger 8 and discharges it from the discharge port 12. The reciprocating motion is performed when the tip of the plunger 8 reciprocates between the boosting forward end position and the boosting backward end position. In addition, it is preferable that the diameter of the plunger 8 in a present Example shall be 8-30 mm.

  This is because the origin position detection sensor 9 recognizes the rear end portion of the screw shaft portion 4 at the stepped back end position of the roller screw mechanism 5 and issues a detection signal to the sequencer 14 connected to the operation panel 16. The origin position is determined, the rotation angle of the resolver 13 that detects the rotation angle of the screw shaft portion 4 is detected, and the position of the tip portion of the plunger 8 is detected. When it is detected that the position of the tip portion of the plunger 8 has reached a predetermined step-up advance position, a command to reverse the rotation of the hollow servomotor 1 is issued by the servo amplifier 15 connected to the power supply 17.

  That is, the nut portion 3 of the roller screw mechanism is driven by the rotation of the hollow servo motor 1 to advance the screw shaft portion 4 in the direction of the high pressure cylinder 6. Thereby, the liquid raw material in the high pressure cylinder 6 is pressurized by the plunger 8 and discharged from the discharge port 12 at the tip of the high pressure cylinder 6. When it is determined from the detection of the resolver 13 that the position of the tip of the plunger 8 has reached the step-up advance position, the rotation of the hollow servomotor 1 is stopped and the rotation is subsequently reversed. At this time, the front end surface of the plunger 8 is designed at a short distance that does not reach the front end surface of the high pressure cylinder 6.

  The nut portion 3 rotates counterclockwise by the hollow servomotor 1 driven in reverse. Along with this, the plunger 8 moves backward in the high pressure cylinder 6. As a result, the liquid material is sucked into the high pressure cylinder 6 while releasing the check valve from the liquid suction port 11 into the high pressure cylinder 6. When it is determined that the position of the tip of the plunger 8 has reached the boosting and retracting end position by the detection of the resolver 13, the rotation of the hollow servo motor 1 is stopped and reversed from the reverse drive to the normal drive.

  The pressurization / discharge process and the suction process as described above are repeated. Specifically, the suction and pressure increase are performed by repeating the forward and backward movements between positions where the pressure and the forward end have moved backward by one stroke. The reverse speed is constant (about 40 mm / s), and the forward speed can be set and changed on the touch panel of the operation panel 16. The boost pressure is set at the forward speed.

  In the present embodiment, it is necessary to remove or clean or replace the high-pressure packing 7 disposed at the rear end of the high-pressure cylinder 6 in order to prevent contamination at the time of raw material change or cleaning. At this time, it is determined that the plunger 8 has reached the end of disassembly by the detection of the resolver 13, and the mode is shifted to the disassembly mode in a state where the driving of the hollow servomotor 1 is finished.

  At the final disassembly end portion, the tip end of the plunger 8 connected to the tip end of the screw shaft portion 4 is in a state of being detached from the high pressure packing 7. After retreating to this state, the high-pressure cylinder 6 is removed and cleaned or replaced. Thereby, the high pressure cylinder 6 can be easily cleaned or replaced.

  FIG. 2 is a schematic diagram of a pressure waveform caused by repeated suction and pressure discharge according to the specifications of the electric wet atomization apparatus of FIG. As shown in FIG. 2, the plunger 8 at the pressure increase / retreat end position is advanced in about 1 to 5 seconds to obtain a high pressure of 245 MPa. When the plunger 8 reaches the pressurization advance end position, the advancement of the plunger 8 is stopped, and the plunger 8 is moved backward for about 2 seconds. In this way, the liquid material is crushed and dispersed by repeatedly moving the plunger 8 forward and backward.

  It was verified whether or not the injection pressure of the electric wet atomization apparatus of this example can be measured from the load of the hollow servomotor. FIG. 3 is a diagram showing a measurement result of a voltage output value by repetition of suction and pressure discharge of the electric wet atomization apparatus of FIG. As shown in FIG. 3, when the voltage output value of the hollow servomotor 1 is verified, the plunger 8 is retracted in the positive voltage region, and the plunger 8 is advanced in the negative voltage region. In FIG. 3, it was verified that the pressure in the cylinder 6 was the highest when the voltage in the negative region was the lowest.

  Therefore, it can be seen that the injection pressure may be obtained from the current value or voltage value of the motor load. FIG. 4 is a diagram showing a measurement result of a pressure value by repetition of suction and pressure discharge of the electric wet atomization apparatus of FIG. In FIG. 4, it was verified that the plunger 8 reaches the maximum pressure (about 124 MPa) immediately after the start of forward movement.

  Therefore, FIG. 5 shows the results of measuring several pressure values at the time of pressure increase and current values at that time when the forward speed of the plunger 8 is changed by the same electric wet atomization apparatus. As shown in FIG. 5, it was verified that the relationship between the electric current value of the electric wet atomization apparatus and the injection pressure was proportional within a certain range. It should be noted that a specific proportional relationship was also obtained for each combination of plunger diameter and nozzle diameter.

  Moreover, the measurement result of the pressure value at the time of using the plunger about 80% smaller than the magnitude | size of the plunger diameter used in FIG. 4 is shown in FIG. This result shows a maximum pressure of about 185 MPa. Thus, the maximum pressure can be set as appropriate by changing the plunger diameter. Furthermore, when a plunger that is 85% smaller than the plunger diameter used in FIG. 6 is used, the maximum pressure is 245 MPa.

  In addition, although this invention is an electric wet atomization apparatus which can be used with a 100V power supply, it can be similarly used with a 200V power supply.

1 ... Hollow servo motor,
2 ... hollow part,
3 ... Nut part,
4 ... Screw shaft part,
5 ... Roller screw mechanism (high efficiency screw mechanism),
6 ... High pressure cylinder,
7 ... High pressure packing,
8 ... Plunger,
9: Origin position detection sensor,
10: Electric wet atomization device,
11 ... liquid suction port,
12 ... discharge port,
13 ... Resolver,
14 ... Sequencer (drive control means),
15 ... Servo amplifier (drive control means),
16 ... Control panel,
17 ... Power supply,
18 ... Nozzle

Claims (5)

A power transmission mechanism that converts the forward / reverse rotational motion of the drive source into a reciprocating motion using an electric motor as a driving source, a plunger that reciprocates in the cylinder by the power transmission mechanism, and a drive control means that controls the reciprocating motion of the plunger; A wet atomization apparatus that sucks, pressurizes, and discharges a liquid raw material into a cylinder by reciprocating movement of the plunger,
The power transmission mechanism includes a nut portion that performs forward / reverse rotational motion, a screw shaft portion that converts the rotational motion of the nut portion into reciprocating motion, and a plurality of rolling elements interposed therebetween, and a high-efficiency screw. Mechanism,
The drive source rotates the nut portion of the screw mechanism disposed in the hollow portion of the rotor forward and backward, and advances the plunger in the direction of the rotation axis of the nut portion through a screw shaft portion that passes through the hollow portion. An electric wet atomization device characterized by being a hollow servo motor that moves backward.   The electric wet atomization apparatus according to claim 1, wherein the high-efficiency screw mechanism is a roller screw mechanism in which the rolling element has a roller shape. A high-pressure packing seal material is disposed at the rear end of the cylinder where the plunger enters and exits,
3. The electric wet atomization apparatus according to claim 1, wherein the last driving position of the plunger is a position where the tip of the plunger is disengaged from the high pressure packing. 4. An origin position detection sensor for detecting the position of the boosted back end of the plunger as the origin;
A rotation angle detection sensor for detecting the angle of the screw shaft portion of the high-efficiency screw mechanism,
The drive control means uses the position detected by the origin position detection sensor before starting the reciprocating motion of the plunger as the origin,
When the rotation angle detection sensor detects a predetermined boosting forward end position and boosting backward end position, the rotation direction of the hollow servomotor is switched to suck and pressurize and discharge the liquid material into the cylinder. The electric wet atomization apparatus according to any one of claims 1 to 3.   The electric wet atomization apparatus according to any one of claims 1 to 4, wherein the driving source is an electric motor driven at a voltage of 100 V, and the liquid raw material is pressurized and discharged at a maximum pressure of 245 MPa.

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