Wet atomization device

Abstract

To provide a small wet type atomizer where pressure rise in a compression chamber is stably realized by suppressing the intake of excess air and raw material treatment having high repeatability can be performed.SOLUTION: A wet type atomizer comprises: a power transmission means to convert the forward and backward motions of a servo motor to a reciprocating motion; a plunger to pressurize a raw material by being pressurized in a high pressure cylinder 3 by the power transmission means; a drive control means to control the reciprocating motion of the plunger; a nozzle 6 to atomize the pressurized raw material; a first check valve 7a to be disposed at the downstream side of the nozzle 6; and a first elastic member 8a to pressurize the first check valve 7a.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a wet atomization device.

Background Art

[0002] A wet atomization device pressurizes a raw material to a high pressure of up to 245 MPa by a water jet and injects it at high speed from a fine nozzle with an injection diameter of 0.05 to 0.5 mm. By doing so, the primary particles mainly aggregate to form secondary aggregated particles, which are disintegrated and dispersed by the collision between particles during injection or against a hard member, the shearing force generated by passing through the nozzle and the counter flow, and the impact force caused by jet cavitation (see, for example, Patent Document 1).

[0003] In such a wet atomization device, in order to obtain a high pressure of 245 MPa, a booster type (pressure boosting type) using hydraulic drive is used. However, in manufacturing such as pharmaceutical manufacturing and precision electronic component manufacturing, due to pollution prevention, there is a tendency to dislike the atmosphere where drive oil is used. As such an atomization device, an atomization device using a motor as a drive source and aiming at miniaturization has already been proposed (see, for example, Patent Document 2).

[0004] Furthermore, an electric wet atomization device has already been proposed that uses an electric motor instead of hydraulic drive as a drive source, is small, can be used even in a simple laboratory with a 100 V power supply, and facilitates the replacement work of the high-pressure packing seal material incorporated inside the cylinder (see, for example, Patent Document 3).

[0005] Furthermore, a pump device that can smoothly perform water absorption and water supply by arranging a coil spring, a steel ball, etc. in the suction pipe and the discharge pipe respectively has already been proposed (see, for example, Patent Document 4).

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, even in a small wet atomization device, there are multiple variations in the nozzle diameter when injecting and atomizing (crushing, dispersing) the raw material. When it is desired to increase the throughput, a nozzle diameter of a relatively large size is used. In that case, the amount of raw material passing through the nozzle and the peripheral equipment increases, and the pressurization and decompression energy when the plunger reciprocates in the high-pressure cylinder also increases. For this reason, there is also a problem that outside air (air) is taken in from the location where the wet atomization device communicates with the outside (especially the nozzle and the injection part), resulting in fluctuations in the pressurization (pressure increase) in the high-pressure cylinder that serves as the pressurization chamber. The fact that the pressure increase in the pressurization chamber fluctuates means that the pressure for processing the raw material varies, and the characteristics of the processed raw material become unstable.

[0008] Furthermore, many of the valve structures disclosed in Patent Document 4 assume fluids with low viscosity and high fluidity such as water. However, many of the raw materials to be processed in a wet atomization device have high viscosity, and even if such a valve structure is used, there is a possibility that the raw material adheres to the inside of the valve, resulting in raw material clogging. When raw material clogging occurs, an appropriate pressure cannot be applied, and variations occur in the characteristics of the processed raw material.

[0009] An object of the present invention is to obtain a small wet atomization device that eliminates these conventional disadvantages, suppresses the intake of excess air, stably realizes the pressure increase in the pressurization chamber, and can perform highly reproducible raw material processing.

Means for Solving the Problems

[0010] The wet atomization device of the present invention includes a power transmission means (2) for converting the forward and reverse rotational movement of a servo motor (21) into a reciprocating movement, a plunger (4) for pressurizing a raw material (M) by reciprocating inside a high-pressure cylinder (3) by the power transmission means (2), a drive control means (5) for controlling the reciprocating movement of the plunger (4), a nozzle (6) for atomizing the pressurized raw material (M), a first check valve (7a) disposed on the downstream side of the nozzle (6), and a first elastic member (8a) for pressing the first check valve (7a).

Advantages of the Invention

[0011] According to the wet atomization device of the present invention, by suppressing the intake of excess air, the pressure increase in the pressurization chamber can be stably achieved, and raw material processing with high reproducibility can be performed.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0013] Hereinafter, embodiments will be described with appropriate reference to the drawings. As shown in FIGS. 1 to 3, the wet atomization device 1 in this embodiment includes a power transmission means 2, a high-pressure cylinder 3, a plunger 4, a drive control means 5, a nozzle 6, a check valve 7, and an elastic member 8. The wet atomization device 1 sucks the raw material M into the high-pressure cylinder 3 from the suction port 3a by the reciprocating motion of the plunger 4, pressurizes it, and discharges it from the discharge port 3b. The wet atomization device 1 is configured by connecting the above components to the main body 1a. The wet atomization device 1 processes the raw material M by operating the pressing portion 1c and the display portion 1d by the operator while the raw material M is being introduced into the high-pressure cylinder 3 from the raw material tank 1b in a state where the drive source 20 is turned on.

[0014] The power transmission means 2 converts the forward and reverse rotational motion of the servo motor 21 into a reciprocating motion. As the power transmission means 2, for example, a high-efficiency screw mechanism 2a such as a ball screw mechanism or a roller screw mechanism is used. For example, the high-efficiency screw mechanism 2a (roller screw mechanism) is attached inside the servo motor 21, and the nut portion 21b of the high-efficiency screw mechanism 2a is rotated inside the motor so that the screw shaft portion 21c moves forward and backward.

[0015] The servo motor 21 rotates an inner cylinder having a hollow portion 21a inside, and by rotating the nut portion 21b attached inside it, the screw shaft portion 21c on the central axis moves forward and backward. By coupling the plunger 4 to the axial tip side of the screw shaft portion 21c, the forward and backward movement of the screw shaft portion 21c becomes the reciprocating motion of the plunger 4. Here, the specifications of the servo motor 21 are a drive voltage of 100V and a drive output of 1.5kW. Since the high-efficiency screw mechanism 2a is adopted, the power transmission efficiency is increased, and even with the servo motor 21 driven at 100V, a high-pressure output can be obtained.

[0016] The high-pressure cylinder 3 has a flow path 3c formed inside it. When the plunger 4 reciprocates in the flow path 3c, the pressure in the flow path 3c (pressure chamber) is increased, and thus the raw material M can be pressurized. Since the raw material M and the solvent for pressurization cover a wide variety of types (materials, acidic or alkaline, etc.), a material such as stainless steel can also be used for the high-pressure cylinder 3 so that it does not corrode inside. The high-pressure cylinder 3 has a suction port 3a for sucking the raw material M supplied from a liquid supply pump (not shown) and a discharge port 3b for discharging the raw material M after the pressurization process. For example, the suction port 3a and the discharge port 3b can be arranged in a vertical positional relationship, or in a case where the suction port 3a is above and the discharge port 3b is arranged in a lateral position, and the positional relationship can be set as appropriate.

[0017] The plunger 4 pressurizes the raw material M by reciprocating inside the high-pressure cylinder 3 by means of the power transmission means 2.

[0018] The drive control means 5 controls the reciprocating motion of the plunger 4. The drive control means 5 includes a sequencer 5a and a servo amplifier 5b, and commands the target position of the plunger 4 from the sequencer 5a to the servo amplifier 5b. The target position referred to here is the forward position at the end of pressure increase, the backward position at the end of pressure increase, and the last position at the end of disassembly of the plunger 4.

[0019] Before the reciprocating motion of the plunger 4 starts, the drive control means 5 recognizes the origin that serves as a reference for position control by the origin position detection sensor 5c that detects the backward position at the end of pressure increase of the plunger 4 as the origin. Then, the drive control means 5 controls the position of the plunger 4 by comparing the commanded target position with the current position detected by the rotation angle detection means 22 that detects the rotation angle of the nut portion 21b of the high-efficiency screw mechanism 2a. By performing position control of the plunger 4 in this way, the wet atomization device 1 can surely suck, pressurize, and discharge the raw material M into the high-pressure cylinder 3. The plunger 4 repeats forward and backward movements between the forward position at the end of pressure increase and the backward position at the end of pressure increase that is one stroke backward from the forward position at the end of pressure increase, thereby sucking and pressurizing the raw material M.

[0020] The rotation angle detection means 22 can recognize the current position of the plunger 4 by detecting the rotation angle of the nut portion 21b of the high-efficiency screw mechanism 2a. Examples of the rotation angle detection means 22 include an encoder and a resolver.

[0021] The nozzle 6 atomizes the pressurized raw material M. The nozzle 6 has an orifice for atomizing by passing the raw material M therethrough, and as the orifice diameter, those of 0.05 to 0.5 mm can be appropriately selected. Also, as shown in Fig. 3, a sphere 6a is arranged in the injection direction of the nozzle 6, and by causing the high-pressure injected raw material M to collide with the sphere 6a, the raw material M can be atomized or emulsified. The sphere 6a is a rigid body, and it is desirable to use a material that is less likely to wear or break due to the collision of the raw material M. Also, the nozzle 6 can be directly connected to the high-pressure cylinder 3. However, as shown in Fig. 3, separately from the high-pressure cylinder 3, by connecting and fixing the nozzle holder 9 to the high-pressure cylinder 3 and internally arranging the nozzle 6 in the nozzle holder 9, the injection direction of the raw material M can also be stabilized. Specifically, the nozzle holder 9 includes an upper nozzle holder 9a, and by connecting the high-pressure cylinder side connecting portion 3d formed on the high-pressure cylinder 3 and the upper nozzle holder 9a, the nozzle 6 can be stably fixed. Thread grooves are formed on the outer surface of the high-pressure cylinder side connecting portion 3d and the inner surface of the upper nozzle holder 9a, and they are connected by screwing the upper nozzle holder 9a onto the high-pressure cylinder side connecting portion 3d so as to cover it. Also, in this specification, although the connection structure is exemplified by connection with a screw, it can be appropriately selected such as connection by a concave portion and a convex portion, or connection by forming a claw portion on one side. Furthermore, when connecting by a screw or the like inside the flow path, since the raw material M flows inside the flow path, there is a possibility of occurrence of clogging of the raw material M or rust of the screw or the like. Therefore, by adopting a structure in which the upper nozzle holder 9a is fitted from the outside, the occurrence of nozzle clogging, rust, etc. can be suppressed.

[0022] The nozzle holder 9 can also be provided with an upper nozzle holder 9a and a lower nozzle holder 9b that is connected to the upper nozzle holder 9a and fixes the first check valve 7a, the first elastic member 8a, and the discharge port 3b. For example, the lower nozzle holder 9b has a protruding portion 9ba and can function as the nozzle holder 9 by connecting to the receiving portion 9aa of the upper nozzle holder 9a.

[0023] Also, by arranging the first check valve 7a and the first elastic member 8a at the lower part (downstream side) of the nozzle 6, since the nozzle 6 for performing the high-pressure treatment exists inside the apparatus, it is possible to make it more difficult for the influence of the suction of external air to reach. If the first check valve 7a and the first elastic member 8a are directly connected to the high-pressure cylinder 3 and the nozzle 6 is arranged below the first check valve 7a, since they are arranged in a high-pressure environment, the first check valve 7a and the first elastic member 8a are likely to be damaged. And in the unlikely event of damage, it may cause seal failure or clogging of the raw material M, and may adversely affect the characteristics of the processed raw material M sprayed from the nozzle 6. Furthermore, when the diameter of the nozzle 6 becomes large, there remains a possibility of sucking in external air, and the processing of the raw material M becomes unstable. Therefore, by arranging the first check valve 7a and the first elastic member 8a at the lower part of the nozzle 6, the load applied to the first check valve 7a and the first elastic member 8a can be reduced, and the atomization treatment and emulsification treatment of the raw material M can be stabilized by preventing seal failure and clogging of the raw material M. Furthermore, by adopting a structure in which the raw material M (small in size) atomized by being sprayed from the nozzle 6 and colliding with the spherical body 6a is sealed by the check valve 7a and the first elastic member 8a, compared with the case where the nozzle 6 is arranged below the first check valve 7a as in the conventional case and the raw material M (large in size) before atomization is sealed, since the influence of the particle diameter and the pressure increase is small, more efficient sealing performance can be ensured.

[0024] Furthermore, as shown in FIG. 4, by providing a protective cover 9d arranged outside the nozzle holder 9, the stability and anti-vibration performance can also be improved.

[0025] As shown in FIG. 3, the check valve 7 is composed of a first check valve 7a and a second check valve 7b. The first check valve 7a is disposed on the side of the discharge port 3b that discharges the raw material M after the pressurization process. Specifically, the first check valve 7a is disposed downstream (here, downward) of the nozzle 6. The first check valve 7a does not allow air to be inhaled into the high-pressure cylinder 3 from the discharge port 3b during the reciprocating motion of the plunger 4. By disposing the first check valve 7a, when the plunger 4 advances, the first check valve 7a is in an open state, and the raw material M can be discharged from the discharge port 3b. On the other hand, when the plunger 4 retreats, the first check valve 7a is in a closed state, and the raw material M cannot be discharged. With such a structure, in the high-pressure cylinder 3, when the plunger 4 advances and discharges the raw material M from the nozzle 6 while increasing the pressure of the raw material M, the processed raw material M is appropriately discharged from the discharge port 3b. On the other hand, in the high-pressure cylinder 3, when the plunger 4 retreats and the pressure in the high-pressure cylinder 3 decreases, air does not enter from the discharge port 3b.

[0026] If the reciprocating motion (pressure increase and decrease) of the plunger 4 in the high-pressure cylinder 3 is repeated while air remains in the high-pressure cylinder 3, the pressure in the high-pressure cylinder 3 will not be appropriately increased due to the influence of the inhaled air. In this case, as a result, variations will occur in the quality of the processed raw material M. Therefore, by disposing the first check valve 7a, such pressure increase can be stabilized. As the first check valve 7a, for example, a spherical ball or the like can be used.

[0027] Furthermore, by disposing the first elastic member 8a below the first check valve 7a, the first check valve 7a can be adjusted to be fixed at the same position during normal times. The first elastic member 8a presses the first check valve 7a toward the upstream side in the valve closing direction, that is, the nozzle 6 side (here, upward). When discharging the processed raw material M, as the discharge pressure increases, the first check valve 7a and the first elastic member 8a are pushed downward and communicate with the outside, so that the processed raw material M can be discharged from the discharge port 3b.

[0028] The second check valve 7b is disposed on the suction port 3a side for sucking the raw material M supplied from a liquid supply pump (not shown). Specifically, the second check valve 7b is disposed on the upstream side (here, the upper side) of the suction port 3a. The second check valve 7b prevents air from being sucked into the high-pressure cylinder 3 from the suction port 3a during the reciprocating motion of the plunger 4. By disposing the second check valve 7b, when the plunger 4 retreats, the second check valve 7b is in an open state, and the raw material M can be sucked. On the other hand, when the plunger 4 advances to discharge the raw material M, the second check valve 7b is in a closed state, and the raw material M does not leak from the suction port 3a. With such a structure, in the high-pressure cylinder 3, when the plunger 4 advances to discharge the raw material M from the nozzle 6 while boosting the pressure of the raw material M, the processed raw material M is appropriately discharged from the discharge port 3b. On the other hand, in the high-pressure cylinder 3, when the plunger 4 retreats and the pressure in the high-pressure cylinder 3 is reduced, air does not enter from the suction port 3a.

[0029] If the reciprocation (pressure boosting and pressure reduction) of the plunger 4 in the high-pressure cylinder 3 is repeated while air remains in the high-pressure cylinder 3, the pressure in the high-pressure cylinder 3 will not be appropriately boosted due to the influence of the sucked air. In this case, as a result, variations will occur in the quality of the processed raw material M. Therefore, by disposing the second check valve 7b, such pressure boosting can be stabilized. As the second check valve 7b, for example, a spherical ball or the like can be used.

[0030] Furthermore, by disposing the second elastic member 8b below the second check valve 7b, the second check valve 7b can be adjusted to be fixed at the same position during normal times. The second elastic member 8b presses the second check valve 7b in the closing valve direction, that is, toward the upstream side, which is the opposite side of the suction port 3a (here, the upper side). When discharging the processed raw material M, the second check valve 7b and the second elastic member 8b are pressed upward and are in a closed state. When the raw material M passes through the first check valve 7a, the second check valve 7b does not allow the raw material M to pass through. When the raw material M passes through the second check valve 7b, the first check valve 7a does not allow the raw material M to pass through. By adopting such a structure, the pressure in the high-pressure cylinder 3 can be effectively managed.

[0031] Also, in this specification, although the raw material tank 1b and the nozzle 6 are described in a form where one is arranged above and the other is arranged below, the number of arrangements is not limited to one. By arranging a plurality of raw material tanks 1b and / or nozzles 6 around the high-pressure cylinder 3, the processing flow rate can also be increased. In addition, by arranging the first check valve 7a and the second check valve 7b, it has been proposed to mechanically maintain the pressure in the high-pressure cylinder 3 constantly without leakage, but electrification can also be achieved. For example, the first check valve 7a and the second check valve 7b can be automatically switched between ON and OFF in accordance with the operation of the pressing part 1c and the processing time of the raw material M.

[0032] Also, as shown in FIGS. 2 to 4, a pressure detection unit 10 for measuring the pressure in the high-pressure cylinder 3 can be arranged. By measuring the pressure in the high-pressure cylinder 3, the quality of the processed raw material M can be stabilized, and the abnormality of the wet atomization device 1 can also be detected. As the pressure detection unit 10, it is desirable to use a pressure sensor. The information obtained by the pressure detection unit 10 is displayed on the display unit 1d so that the operator can appropriately check the pressure state. In addition, the pressure detection unit 10 is connected to the pressure detection communication part 10a of the high-pressure cylinder 3 via a pressure detection seal 10b. Thereby, the pressure in the high-pressure cylinder 3 can be measured more accurately. Also, by directly connecting the pressure detection unit 10 to the high-pressure cylinder 3, it is not necessary to additionally form a space for detecting the pressure of the raw material, and the dead volume can also be reduced.

[0033] The display unit 1d will be described with reference to FIG. 5. The display unit 1d is provided with a nozzle diameter setting unit 11, an injection pressure setting unit 12, and a solvent specific gravity setting unit 13. The display unit 1d is, for example, a touch panel that displays various information or performs various setting inputs.

[0034] The nozzle diameter setting unit 11 selects any one of a plurality of nozzle diameters. For example, there are three types of setting buttons, and any one of nozzle diameters of 0.1 mm, 0.15 mm, and 0.20 mm can be selected. Note that the number of setting buttons is not limited to three types and can be appropriately changed, such as setting five types. Furthermore, in addition to the selection type (a format that can be selected for each specific nozzle diameter), a format in which a numerical value can be manually adjusted is also conceivable.

[0035] The injection pressure setting unit 12 selects a target injection pressure. For example, there are three types of setting buttons, and any one of 50 MPa, 100 MPa, and 150 MPa can be selected. Note that the number of setting buttons is not limited to three types and can be appropriately changed, such as setting five types. Furthermore, in addition to the selection type (a format that can be selected for each specific pressure), a format in which a numerical value can be manually adjusted is also conceivable.

[0036] The solvent specific gravity setting unit 13 selects the solvent to be used. For example, there are three types of setting buttons, and any one of water, solvent A (ethanol), and solvent B (organic solvent) can be selected. Note that the number of setting buttons is not limited to three types and can be appropriately changed.

[0037] The forward / backward speed calculation unit 15 calculates the forward / backward speed of the plunger 4 from the nozzle diameter, the target injection pressure, and the specific gravity of the solvent set using the nozzle diameter setting unit 11, the injection pressure setting unit 12, and the solvent specific gravity setting unit 13. The forward / backward speed calculated by the forward / backward speed calculation unit 15 may be displayed on the display unit 1d.

[0038] Furthermore, a measured pressure display unit 14 that displays the injection pressure measured by the pressure detection unit 10 can also be arranged on the display unit 1d.

[0039] In addition, numerical values related to environmental loads such as the amount of carbon dioxide can be displayed on the display unit 1d by using the amount of power corresponding to the processing time in the case of a 100V power supply.

[0040] Also, the raw material M can be forcibly sucked using a liquid supply pump (not shown) so that it is sucked from the raw material tank 1b into the high-pressure cylinder 3.

[0041] Also, a control unit (not shown) can be arranged to combine pressure adjustment by the torque and rotational speed of the servo motor 21 with pressure adjustment in the high-pressure cylinder 3 by the pressure detection unit 10, thereby realizing highly accurate pressure management. Specifically, when the pressure detected by the pressure detection unit 10 is lower than a preset value, the rotational speed of the servo motor 21 increases according to a signal from the control unit to adjust the pressure in the high-pressure cylinder 3, etc.

[0042] As a modification of the nozzle 6, as shown in FIG. 6, the nozzle 6B has an internal chip 6Bd for passing the raw material M inside a recess 6Bc of the nozzle body 6Ba, and an external chip 6Be is arranged outside the internal chip 6Bd. The internal chip 6Bd has a through hole 6Bf and a nozzle groove 6Bg. The through hole 6Bf is a hole for passing the raw material M in a high-pressure state in the high-pressure cylinder 3 into the nozzle 6B. The nozzle groove 6Bg is a recess formed in communication with the through hole 6Bf. In this modification, since the through hole 6Bf and the nozzle groove 6Bg are L-shaped in cross-section, as the diameter of the through hole 6Bf is reduced and refined, shear can be effectively applied by the flows with different traveling directions due to the nozzle groove 6Bg. Also, in the nozzle 6B of this modification, since the through hole 6Bf and the nozzle groove 6Bg are L-shaped in cross-section, it is difficult for external air to be sucked into the high-pressure cylinder 3. Therefore, the air suction prevention effect by the first check valve 7a and the second check valve 7b can be further improved, contributing to the uniformization of the pressurizing pressure in the high-pressure cylinder 3.

[0043] Further, modified examples of the power transmission means 2 and the drive control means 5 are shown in FIG. 7. As shown in FIG. 7, the rotational drive of the servomotor 21 is transmitted to the nut portion 21b via the belt mechanism 2b, and the plunger 4 coupled to the screw shaft portion 21c advances and retracts by the rotation of the nut portion 21b. The belt mechanism 2b has a first pulley 21d connected to the shaft of the servomotor 21, a second pulley 21e connected to the nut portion 21b, and a belt 21f stretched between the first pulley 21d and the second pulley 21e. Further, the drive control means 5 adjusts the forward and backward strokes by detecting the end portion of the screw shaft portion 21c by the end detection means 5d.

[0044] Next, a method of using the wet atomization device 1 of the present embodiment configured as described above will be described.

[0045] First, the operator drives the drive source 20 to put the power transmission means 2 and the drive control means 5 in a standby state. Further, the operator makes the raw material tank 1b in a state where it can be supplied from the suction port 3a of the high-pressure cylinder 3.

[0046] Next, since the drive source 20 is a power source, the wet atomization device 1 is in a prepared state. The operator operates the pressing portion 1c and the display portion 1d to set the pressurizing pressure applied to the raw material M and starts the treatment (atomization) of the raw material M. The processing time, the number of processing times, etc. can also be set as appropriate. After the designated work is completed, the processed raw material M is filled in a container for storage.

[0047] Also, in the nozzle diameter setting unit 11, the injection pressure setting unit 12, and the solvent specific gravity setting unit 13, by setting the nozzle diameter, the injection pressure, and the solvent specific gravity, after calculating the forward / backward speed of the plunger 4, the drive control means 5 can set an appropriate operating value. Also, while checking the actual pressure measured by the pressure detection unit 10, the pressurizing pressure for processing the raw material M can also be adjusted.

[0048] As described above, according to the wet atomization device 1 of the present embodiment, even when the nozzle diameter is changed, for example, by suppressing the intake of excess air, the pressure increase in the pressurization chamber is stably achieved, and raw material processing with high reproducibility can be performed.

[0049] (Verification test) In the wet atomization device 1, the change in the discharge amount was verified between the case where the check valve 7 and the elastic member 8 are arranged and the case where the check valve 7 and the elastic member 8 are not arranged. The verification was performed when the diameter of the nozzle 6 was 0.1 mm and 0.15 mm.

[0050] When the diameter of the nozzle 6 is 0.1 mm, a maximum of 100 MPa is assumed, but the discharge amounts at 40 MPa and 60 MPa, which are pressure ranges often used, were measured. The discharge amount was measured with 3.0 ml / 1 shot as the appropriate value. As a result, in the case of 40 MPa, when the check valve 7 and the elastic member 8 were arranged, the discharge amount was 3.0 ml / 1 shot, whereas when the check valve 7 and the elastic member 8 were not arranged, the discharge amount was 2.8 ml / 1 shot. As a result, in the case of 60 MPa, when the check valve 7 and the elastic member 8 were arranged, the discharge amount was 2.9 ml / 1 shot, whereas when the check valve 7 and the elastic member 8 were not arranged, the discharge amount was 2.8 ml / 1 shot.

[0051] When the diameter of the nozzle 6 is 0.15 mm, a maximum of 20 MPa is assumed, but the discharge amounts at 5 MPa and 15 MPa, which are pressure ranges often used, were measured. The discharge amount was measured with 3.0 ml / 1 shot as the appropriate value. As a result, in the case of 5 MPa, when the check valve 7 and the elastic member 8 were arranged, the discharge amount was 2.9 ml / 1 shot, whereas when the check valve 7 and the elastic member 8 were not arranged, the discharge amount was 2.7 ml / 1 shot. As a result, in the case of 15 MPa, when the check valve 7 and the elastic member 8 were arranged, the discharge amount was 2.9 ml / 1 shot, whereas when the check valve 7 and the elastic member 8 were not arranged, the discharge amount was 2.8 ml / 1 shot.

[0052] In both cases, the discharge amount has increased, and it has been confirmed that the throughput is stabilized by arranging the check valve 7 and the elastic member 8. Furthermore, when the conventional check valve 7 and the elastic member 8 are not arranged, in order to stabilize the discharge amount, depending on the raw material M, it was sometimes necessary to perform an air bleeding operation about 4 to 10 times. However, when the check valve 7 and the elastic member 8 are arranged, it has also been confirmed that the discharge amount is stabilized by performing an air bleeding operation about 2 to 3 times.

[0053] As described above, the present invention is not limited to the above-described embodiments, and it goes without saying that the present invention can be appropriately modified without departing from its gist.

Explanation of Reference Numerals

[0054] 1 Wet atomization device 1a Main body 1b Raw material tank 1c Pressing part 1d Display part 2 Power transmission means 2a High-efficiency screw mechanism 3 High-pressure cylinder 3a Suction port 3b Discharge port 3c Flow path 4 Plunger 5 Drive control means 5a Sequencer 5b Servo amplifier 5c Origin position detection sensor 6, 6B Nozzle 6Bf Through hole 6Bg Nozzle groove 7 Check valve (first check valve 7a, second check valve 7b) 8 Elastic member (first elastic member 8a, second elastic member 8b) 9 Nozzle holder 9d Protection cover 10 Pressure detection part 10a Pressure detection communication part 10b Pressure detection seal 11 Nozzle diameter setting unit 12 Injection pressure setting unit 13 Solvent specific gravity setting unit 14 Measured pressure display unit 15 Forward / backward speed calculation unit 20 Drive source 21 Servo motor 21a Hollow part 21b Nut part 21c Threaded shaft part 22 Rotation angle detection means M Raw material

Claims

1. Power transmission means for converting the forward and reverse rotational motion of a servo motor into reciprocating motion, A plunger for pressurizing a raw material by reciprocating within a high-pressure cylinder by means of the power transmission means, Drive control means for controlling the reciprocating motion of the plunger, A nozzle for atomizing the pressurized raw material, A first check valve disposed on the downstream side of the nozzle, A wet atomizing device having a first elastic member for pressing the first check valve.

2. The high-pressure cylinder, Has a suction port and a discharge port for the raw material, The wet atomizing device, A second check valve disposed on the upstream side of the suction port, The wet atomizing device according to claim 1, further comprising a second elastic member for pressing the second check valve.

3. The wet atomizing device according to claim 1 or 2, further comprising a pressure detection unit for measuring the pressure inside the high-pressure cylinder.

4. The wet atomizing device according to claim 3, wherein the pressure detection unit is connected to a pressure detection communication part of the high-pressure cylinder via a pressure detection seal.

5. The wet atomizing device according to claim 1 or 2, further comprising a nozzle holder disposed in the high-pressure cylinder and having the nozzle therein.

6. The wet atomizing device according to claim 5, further comprising a protective cover disposed outside the nozzle holder.

7. A display unit having a nozzle diameter setting unit for selecting any one of a plurality of nozzle diameters, an injection pressure setting unit for selecting a target injection pressure, and a solvent specific gravity setting unit for selecting a solvent to be used, The wet atomizing device according to claim 3, further comprising a forward / backward speed calculation unit for calculating the forward / backward speed of the plunger from the nozzle diameter, the target injection pressure, and the specific gravity of the solvent.

8. The display unit, The wet atomizing device according to claim 7, further comprising a measured pressure display unit for displaying the injection pressure measured by the pressure detection unit.

9. The nozzle, A through hole for allowing the raw material in a high-pressure state within the high-pressure cylinder to pass therethrough, A nozzle groove formed in communication with the through hole, The wet atomizing device according to claim 1 or 2, wherein the through hole and the nozzle groove are L-shaped in cross section.

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