JP6874245B2 - Stirring system and its operation method - Google Patents

Description

The present invention relates to a stirring system and a method of operating the same.

Conventionally, various devices have been proposed as a stirring system for dispersing and mixing solids in a liquid, and as one of them, a stirring blade is provided inside the casing proposed by the applicant. A rotor is arranged, and the negative pressure suction force generated by the rotation of the stirring blade sucks the liquid into the casing under negative pressure, and the sucked liquid causes cavitation by the rotation of the stirring blade, so that the solid content with respect to the liquid is generated. A dispersion mixing device including a suction stirring pump for dispersing and mixing has been put into practical use (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2014-8438

By the way, in the dispersion mixing device proposed in Patent Document 1, since the rotor provided with the stirring blade of the suction stirring pump rotates at high speed, a mechanical seal is adopted for the sealing portion of the rotating shaft of the rotor.
On the other hand, there is a request to operate the dispersion mixing device in a state where the inside of the casing is pressurized. In this case, the liquid or gas inside the casing is prevented from leaking through the seal portion of the rotating shaft of the rotor. In order to achieve this, it is necessary to set a large pressing force of the mechanical seal (pressure on the sliding contact surface of the mechanical seal), and inevitably, there is a problem that the mechanical seal is easily worn.

It should be noted that this problem also exists in the vertical axis type distributed mixing apparatus proposed by the applicant in Japanese Patent Application No. 2016-093672.

In view of the problems of the conventional dispersion mixing device, the present invention suppresses leakage of liquid or gas through the sealing portion of the rotating shaft provided with the stirring blade arranged in the pressurizing chamber, and provides the sealing portion. It is an object of the present invention to provide a stirring system capable of minimizing wear of the constituent mechanical seals and a method of operating the stirring system.

In order to achieve the above object, the stirring system of the present invention is arranged between the pressurizing chamber, the rotating shaft provided with the stirring blade arranged in the pressurizing chamber, and the pressurizing chamber and the rotating shaft. It has a mechanical seal that prevents fluid from leaking from the pressurizing chamber and a mechanical seal pressing mechanism that presses the mechanical seal that can change the pressing force against the mechanical seal, and while the pressurizing chamber is pressurized, it has a mechanical seal pressing mechanism. It is characterized in that the pressing force by the mechanical seal pressing mechanism is increased.

In this case, it is possible to have a liquid supply mechanism for supplying the liquid to the pressurizing chamber, a pressurized gas supply mechanism for supplying the pressurized gas to the liquid, and a depressurizing mechanism.

Further, in the operation method of the stirring system of the present invention, the pressurizing chamber, the rotating shaft provided with the stirring blade arranged in the pressurizing chamber, and the pressurizing chamber and the rotating shaft are arranged to pressurize. A method of operating a stirring system having a mechanical seal that prevents fluid leakage from the room and a mechanical seal pressing mechanism that presses the mechanical seal that can change the pressing force against the mechanical seal, wherein the pressurizing chamber pressurizes. While it is being used, it is characterized in that the pressing force of the mechanical seal pressing mechanism is increased.

In this case, the pressurized gas supply mechanism has a liquid supply mechanism for supplying and supplying a fluid to the pressurizing chamber, a pressurized gas supply mechanism for supplying the pressurized gas to the liquid, and a depressurizing mechanism. When the pressurized gas is supplied, the pressing force by the mechanical seal pressing mechanism can be increased, and after the pressure is reduced by the depressurizing mechanism, the pressing force by the mechanical seal pressing mechanism can be brought into a steady state.

According to the stirring system of the present invention and the operation method thereof, while the pressurizing chamber is pressurized, the pressing force by the mechanical seal pressing mechanism is increased, and more specifically, the pressure is applied by the pressurized gas supply mechanism. When the pressure gas is supplied, the pressing force by the mechanical seal pressing mechanism is increased, and after decompression by the depressurizing mechanism, the pressing force by the mechanical seal pressing mechanism is made steady, so that the rotation equipped with the stirring blade arranged in the pressurizing chamber is provided. While suppressing the leakage of liquid or gas through the seal portion of the shaft, it is possible to minimize the wear of the mechanical seal constituting the seal portion.

It is an overall perspective view which shows the dispersion mixing apparatus which is one Embodiment of the stirring system of this invention. It is a front view of the dispersion mixing apparatus. It is a top view of the dispersion mixing apparatus. It is a left side view of the dispersion mixing apparatus. It is sectional drawing (AA sectional drawing of FIG. 2) of the main part of the dispersion mixing apparatus. It is explanatory drawing which shows the internal structure of a suction stirring pump. It is sectional drawing in the BB direction view of FIG. It is an exploded perspective view which shows the internal structure of the dispersion mixing mechanism of a suction stirring pump. It is a schematic block diagram of a partition plate. It is a flowchart which shows an example of the operation method of the dispersion mixing apparatus which is one Embodiment of the stirring system of this invention.

Hereinafter, embodiments of the stirring system of the present invention and its operating method will be described with reference to the drawings.

[Rough structure of dispersion mixer]
1 to 9 show a dispersion mixing device according to an embodiment of the stirring system of the present invention.
In this dispersion mixing device, a rotor 5 provided with a stirring blade 6 that is rotationally driven by a pump drive motor M via a rotating shaft 19 is arranged inside a casing 1 that serves as a pressurizing chamber. The liquid R is sucked into the inside of the casing 1 by the negative pressure suction force generated by the rotation, and cavitation is caused in the sucked liquid R by the rotation of the stirring blade 6, and the solid content is dispersed and mixed with respect to the liquid R. A liquid storage tank Y as a liquid supply mechanism that circulates the liquid R between the stirring pump X and the suction stirring pump X via the circulation flow paths 16 and 18 is provided.

The dispersion mixing device is arranged between the casing 1 serving as the pressurizing chamber and the rotating shaft 19, and constitutes a mechanical seal 22 that constitutes a sealing portion for preventing leakage of fluid (liquid and gas) from the inside of the casing 1. It also has a mechanical seal pressing mechanism Z that presses the mechanical seal 22 that can change the pressing force on the mechanical seal 22, and while the inside of the casing 1 is pressurized, the pressing force by the mechanical seal pressing mechanism Z is increased. I am trying to do it.

The mechanical seal pressing mechanism Z changes the urging force of the spring member 23 by pressing the spring member 23 for urging the mechanical seal 22, the pressing plate 24 for supporting the back surface of the spring member 23, and the pressing plate 24. It is composed of actuators 25a and 25b composed of an air cylinder that makes the pressing force on the mechanical seal 22 variable.
Here, a detection mechanism for confirming the operating state (magnitude of the pressing force with respect to the mechanical seal 22) of the actuators 25a and 25b, for example, a reed switch (not shown) is provided.
In this embodiment, two actuators 25a and 25b are used, but one or three or more actuators can be used, and the actuator can be used with an operating mechanism other than an air cylinder, for example. , Hydraulic cylinders, electric cylinders and the like can be used.
Further, in order to uniformly support the back surface of the spring member 23 by moving the pressing plate 24 in parallel along the rotation shaft 19, the pressing plate 24 is provided with a guide pin 26 for guiding the movement of the pressing plate 24. To be provided through.

Further, this dispersion mixing device is provided with a pressurized gas supply mechanism G for supplying a pressurized gas to the liquid and a depressurizing mechanism Pd.

Here, the pressurized gas supply mechanism G supplies the pressurized gas to the liquid by introducing the pressurized gas into the first introduction chamber 13 of the casing 1 which becomes the pressurized chamber through the valve V1. ing.
The position where the pressurized gas is introduced is not limited to this, and for example, the pressurized gas can be introduced into the circulation flow path 16.

Further, the depressurizing mechanism Pd depressurizes the liquid storage tank Y (releases the pressurized gas) via the depressurizing valve V2, and the depressurized gas can be degassed by the depressurized gas supplied to the fluid. ..

In the first introduction chamber 13 and the liquid storage tank Y of the casing 1 serving as the pressurizing chamber, pressure gauges P1 and P2 for measuring the pressure in the first introduction chamber 13 and the liquid storage tank Y, respectively, are provided. Make sure to provide it.

Further, the discharge pipe 18a can be branched from the circulation flow path 18, the valves V3 and V4 can be switched, and the liquid discharged from the suction stirring pump X can be discharged through the discharge pipe 18a and supplied to the subsequent steps. I am trying to do it.

[Manufacturing of slurry for positive electrode of non-aqueous electrolyte secondary battery]
Hereinafter, a case where a slurry for a positive electrode of a non-aqueous electrolyte secondary battery containing an alkali metal composite oxide is produced by using this dispersion mixing device will be described as an example.
In the production of this slurry for a positive electrode, a step of neutralizing an alkaline component in the slurry using inorganic carbon dissolved in a slurry-like liquid and an inorganic carbon in the slurry are stirred by stirring the neutralized slurry. It includes a step of manufacturing an electrode slurry including a step of degassing as carbon dioxide gas.

The amount of carbon dioxide gas used is such that the pH value of the slurry is 4 to 11, preferably 5 to 10, and more preferably 6 to 9.

The higher the pressure of carbon dioxide, the higher the concentration of dissolved inorganic carbon that can be obtained. Therefore, the pressure is not particularly limited as long as it is above normal pressure, but from the viewpoint of the reaction rate of neutralization, it is 0.03 MPa. The above is preferably 0.2 MPa or more, and more preferably 0.3 MPa or more.
Further, if the pressure exceeds 100 MPa, not only the manufacturing apparatus becomes large-scale, but also the residual amount of dissolved inorganic carbon increases in the slurry after the neutralization treatment, which makes the subsequent degassing treatment difficult. Therefore, the upper limit of the pressure is , 100 MPa or less, preferably 50 MPa or less, more preferably 10 MPa or less.

Dissolved inorganic carbon remains in the slurry after the neutralization treatment, so degassing treatment should be performed.
Here, if the electrode coating is performed without performing the degassing treatment, the active material layer is foamed by the dissolved inorganic carbon in the drying step, and excessive voids are formed, which causes uneven coating, electrode peeling, and detachment. It will be easier.

Dissolved inorganic carbon in the slurry can be separated into neutralized slurry and carbon dioxide gas by degassing treatment.
Membrane degassing is the mainstream for degassing the electrode slurry of a practical battery, but it is difficult to separate the inorganic carbon formed in the slurry by pressurization.
Therefore, in the present invention, the neutralized slurry is agitated so that the inorganic carbon in the slurry is degassed as carbon dioxide gas. In this case, it is preferable to degas under reduced pressure.

As a method for dispersing and mixing the solid content of the slurry, a mixing method using an existing stirring device or the like can be adopted, but it is preferable to disperse and mix by causing cavitation (local boiling).
By adopting a method of dispersing and mixing by causing cavitation (local boiling), the slurry after the neutralization treatment can be efficiently degassed using the same apparatus.
That is, carbon dioxide gas is added in a pressurized state to neutralize the slurry produced by dispersing and mixing by causing cavitation (local boiling), and the slurry is depressurized by causing cavitation (local boiling) again. By degassing, the dispersal and mixing device can also serve as the degassing device, which is economical.
Further, if the decompression mechanism Pd is connected to a vacuum pump (not shown) and the liquid storage tank Y is in a depressurized state to circulate the slurry, degassing can be performed faster.
The slurry can be produced and carbon dioxide gas can be degassed using an existing stirring device or the like.

The slurry contains an active material and a binder as solids, and a conductive additive is added as needed.

The active material is not particularly limited as long as it is an alkali metal composite oxide, but if the non-aqueous electrolyte secondary battery is a lithium secondary battery, the lithium composite oxide, that is, lithium cobalt oxide (LiCoO ₂ ), nickel. Lithium oxide (LiNiO ₂ ), ternary material (LiNi _0.33 Co _0.33 Mn _0.33 O ₂ ), nickel-rich ternary material (LiNi _0.5 Co _0.2 Mn _0.3 O ₂ ) , Lithium nickel-cobalt-lithium aluminum oxide (LiNi _0.8 Co _0.15 Al _0.05 O ₂ ), lithium iron phosphate (LiFePO ₄ ), lithium iron phosphate-manganese (LiFe _0.5 Mn _0.5 PO) ₄ ), Lithium manganese phosphate (LiMnPO ₄ ), Lithium cobalt phosphate (LiCoPO ₄ ), Lithium nickel phosphate (LiNiPO ₄ ), Lithium vanadium phosphate (Li ₃ V ₂ (PO ₄ ) ₃ ), Lithium iron silicate ( Li ₂ FeSiO ₄ ), lithium manganese silicate (Li ₂ MnSiO ₄ ), lithium-rich solid solution system (Li ₂ MnO _3- LiNi _0.33 Mn _0.33 Co _0.33 O ₂ ), spinel-type lithium manganate (LiMn ₂₎ O ₄ ), spinel-type lithium nickel-manganate (LiNi _0.5 Mn _1.5 O ₄ ), nickel-iron-lithium manganate (LiNi _0.33 Fe _0.33 Mn _0.33 O ₂ ), etc. Materials may be mentioned, and one type may be used alone, or two or more types may be used in combination. In addition, there is no problem even if the element ratio of the above active material deviates slightly. If the non-aqueous electrolyte secondary battery is a sodium secondary battery, the sodium composite oxide, that is, the above-mentioned lithium metal element lithium may be replaced with sodium, and if it is a potassium secondary battery, it may be replaced with potassium. Just do it.

Binders are commonly used, such as polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polyimide (PI), polyamide, polyamideimide (PAI), aramid, polyacrylic acid, polyacrylic acid salt, etc. Acrylic acid ester, styrene butadiene rubber (SBR), urethane, ethylene-vinyl acetate copolymer, styrene-ethylene-butylene-styrene copolymer (SEBS), carboxymethyl cellulose (CMC), cellulose sulfate, methyl cellulose ether, methyl ethyl cellulose Ether, ethyl cellulose ether, low nitrogen hydroxyethyl cellulose dimethyldiallyl ammonium chloride (polyquantanium-4), chloride- [2-hydroxy-3- (trimethylammonio) propyl] hydroxyethyl cellulose (polyquantanium-10), chloride- [2-hydroxy- 3- (Lauryldimethylammonio) propyl] hydroxyethyl cellulose (polyquantanium-24), polyvinyl alcohol (PVA), polyvinyl butyral (PVB), ethylene vinyl alcohol, polyethylene (PE), polypropylene (PP), starch and other materials 1 The species may be used alone, or two or more species may be used in combination.

The conductive auxiliary agent is not particularly limited, and examples thereof include metal, carbon material, conductive polymer, and conductive glass. Of these, carbon material is preferable, and specifically, acetylene black (AB) and ketjen black are used. (KB), vapor-grown carbon fiber (VGCF), carbon nanotube (CNT), graphite, hard carbon, soft carbon, furnace black, graphene, glassy carbon, carbon nanohorn, etc., and one or more of these. There is no problem even if you use.
In the positive electrode active material layer, for example, when the total amount of the positive electrode active material, the binder, and the conductive material is 100% by mass, the electrode active material is 60 to 99% by mass, the binder is 0.1 to 25% by mass, and the conductivity is conductive. The substance is preferably 0.1 to 10% by mass. More preferably, the electrode active material is 80 to 95% by mass, the binder is 0.5 to 15% by mass, and the conductive material is 0.5 to 5% by mass.
With the composition of the active material layer of the positive electrode described above, a sufficient binding force and an effect of improving conductivity can be obtained.

The neutralizing agent is not particularly limited as long as it is dissolved inorganic carbon in which carbon dioxide gas is dissolved in a slurry-like liquid. That is, dissolved inorganic carbon may be produced by using a gas containing carbon dioxide gas such as air or carbon dioxide gas generated from a solid containing dry ice. However, it is preferable to use high-concentration carbon dioxide gas in order to efficiently obtain dissolved inorganic carbon with a relatively small pressure.

Then, the slurry for the positive electrode of the non-aqueous electrolyte secondary battery obtained thereby is used to prepare the positive electrode of the non-aqueous electrolyte secondary battery, specifically, the non-aqueous electrolyte secondary coated with an alkali metal carbonate. A positive electrode of a battery can be manufactured, a non-aqueous electrolyte secondary battery can be manufactured using the positive electrode, and the non-aqueous electrolyte secondary battery can be suitably used for an electronic device.

Hereinafter, the components of the dispersion mixing apparatus will be described.

[Liquid storage tank]
In the present embodiment, the liquid storage tank Y has a function of circulating the liquid R with the suction stirring pump X via the circulation flow paths 16 and 18, and the liquid R (solid if necessary). It also has a function of supplying the minute P), and before starting the operation of the suction stirring pump X, a predetermined amount of liquid R (solid content P, if necessary) for purifying the above slurry is stored in the liquid storage tank. The solid content P is charged into the liquid storage tank Y while being charged and stored in Y, or the liquid R is circulated by the suction stirring pump X.

Here, in the present embodiment, as a method of supplying the solid content P, instead of charging the solid content P into the liquid storage tank Y, as shown in FIGS. 4 and 6, a predetermined amount of the solid content P is supplied. A solid content storage hopper 31 to be stored is provided, and the solid content P stored in the solid content storage hopper 31 is directly brought into the casing 1 of the suction stirring pump X from the first supply unit 11 via the charging shutter 31a. A method of sequentially supplying by sucking negative pressure is adopted.
In addition, as a method of supplying the solid content P, similarly, in the middle of the circulation flow path 16 for supplying the solid content stored in the solid content storage hopper from the liquid storage tank Y to the suction stirring pump X. , It is also possible to inhale by the ejector effect obtained by the flow of the liquid R so that the liquid R is supplied to the suction stirring pump X together with the liquid R.

The structure of the liquid storage tank Y is not particularly limited as long as it has a storage function, but for example, a liquid storage tank Y having a stirring mechanism (not shown) can be used.

[Suction stirring pump]
The suction stirring pump X will be described with reference to FIGS. 6 to 9.
As shown in FIG. 6, the suction stirring pump X includes a casing 1 having a cylindrical outer peripheral wall portion 4 whose openings at both ends are closed by a front wall portion 2 and a rear wall portion 3, and the inside of the casing 1. A rotor 5 concentrically provided on the front wall portion 2 in a concentric manner, a cylindrical stator 7 concentrically arranged inside the casing 1 and fixedly arranged on the front wall portion 2, and a pump drive motor for rotationally driving the rotor 5. It is configured to include M and the like.

As shown in FIG. 7, on the outer side in the radial direction of the rotor 5, a plurality of stirring blades 6 project to the front side (lower side in FIG. 6) which is the front wall portion 2 side, and in the circumferential direction. It is integrally provided with the rotor 5 in a state of being lined up at equal intervals.

The cylindrical stator 7 is provided with a plurality of through holes 7a and 7b serving as a throttle flow path side by side in the circumferential direction, and the stator 7 is on the front side of the rotor 5 (lower left side in FIG. 6) and The stirring blade 6 is located inside the stirring blade 6 in the radial direction and is fixedly arranged on the front wall portion 2, and the stirring blade 6 which also serves as a discharge chamber circulates between the stator 7 and the outer peripheral wall portion 4 of the casing 1. An annular wing chamber 8 is formed.

As shown in FIGS. 6 to 8, the first supply portion 11 is provided at a position shifted to the outer peripheral side from the central axis of the front wall portion 2 (axis center A3 of the casing 1).
Here, in the present embodiment, the solid content storage hopper 31 is provided, and the solid content P stored in the solid content storage hopper 31 is sucked and stirred from the first supply unit 11 via the charging shutter 31a. The negative pressure is directly sucked into the inside of the casing 1 of the above.

As shown in FIGS. 6 and 8, an annular groove 10 is formed on the inner surface of the front wall portion 2 of the casing 1, and a first supply portion 11 is provided in a state of communicating with the annular groove 10.

As shown in FIGS. 6 and 7, a cylindrical discharge portion 12 for discharging the slurry-like liquid R generated by mixing the liquid R and the solid content P is a cylindrical outer peripheral wall of the casing 1. The portion 4 is provided at one location in the circumferential direction so as to extend in the tangential direction of the outer peripheral wall portion 4 and communicate with the wing chamber 8.

As shown in FIGS. 2 and 7, the slurry-like liquid R discharged from the discharge unit 12 is returned to the liquid storage tank Y via the circulation flow path 18.

Further, a second supply portion 17 is provided at the central portion (concentric with the axial center A3) of the front wall portion 2 of the casing 1.
Then, the liquid R (slurry liquid R returned to the liquid storage tank Y) charged and stored in the liquid storage tank Y in the second supply unit 17 is negative via the circulation flow path 16. It is supplied by pressure suction.

Further, as shown in FIGS. 6 to 8, a partition plate 15 for partitioning the inner peripheral side of the stator 7 into a first introduction chamber 13 on the front wall portion 2 side and a second introduction chamber 14 on the rotor 5 side is provided. The rotor 5 is provided on the front side in a state of being integrally rotated with the rotor 5, and the scraping blade 9 is provided on the front wall portion 2 side of the partition plate 15. A plurality of scraped blades 9 are provided concentrically at equal intervals in the circumferential direction (four in FIG. 8), and the rotor 5 is provided with each scraped blade 9 having its tip portion 9T entered into the annular groove 10. It is arranged so that it can orbit integrally with.

The first introduction chamber 13 and the second introduction chamber 14 are configured to communicate with the blade chamber 8 through the plurality of through holes 7a and 7b of the stator 7, and the first supply unit 11 is the first. The second supply unit 17 communicates with the introduction chamber 13 and communicates with the second introduction chamber 14.
Specifically, the first introduction chamber 13 and the wing chamber 8 are arranged on a plurality of first introduction chamber 13 sides at equal intervals in the circumferential direction in a portion of the stator 7 facing the first introduction chamber 13. The second introduction chamber 14 and the blade chamber 8 are communicated with each other through the through holes 7a of the above, and a plurality of second introduction chambers 14 and blade chambers 8 are arranged at equal intervals in the circumferential direction in a portion of the stator 7 facing the second introduction chamber 14. It is communicated through the through hole 7b on the introduction chamber 14 side.

Each part of the suction stirring pump X will be described.
As shown in FIG. 6, the rotor 5 is configured such that the front surface thereof bulges in a substantially truncated cone shape, and the rotor 5 is arranged at equal intervals on the outer peripheral side thereof with a plurality of stirring blades 6 projecting forward. It is provided. In FIG. 7, ten stirring blades 6 are arranged at equal intervals in the circumferential direction. Further, the stirring blade 6 is formed so as to project from the outer peripheral side to the inner peripheral side of the rotor 5 so as to incline rearward in the rotational direction from the inner peripheral side to the outer peripheral side, and the tip portion of the stirring blade 6 is formed. The inner diameter of the stator 7 is slightly larger than the outer diameter of the stator 7.

The rotor 5 is located concentrically with the casing 1 in the casing 1, is connected to the drive shaft 19 of the pump drive motor M inserted into the casing 1 through the rear wall portion 3, and the pump thereof. It is rotationally driven by the drive motor M.
As described above, in the present embodiment, the drive shaft 19 of the pump drive motor M serves as the rotation shaft of the rotor 5.
Further, the drive shaft 19 of the pump drive motor M is provided with a mechanical seal 22 constituting a seal portion for preventing the liquid R inside the casing 1 from leaking to the pump drive motor M side.
The mechanical seal 22 is provided with a mechanical seal pressing mechanism Z on the back side for pressing the mechanical seal 22 capable of varying the pressing force on the mechanical seal 22, and the mechanical seal pressing mechanism Z is provided while the inside of the casing 1 is pressurized. It is possible to increase the pressing force by.

Then, the rotor 5 is rotationally driven in a direction in which the tip end portion of the stirring blade 6 is on the front side in the axial direction (viewed in the BB direction of FIG. 6 as shown in FIG. 7), whereby the stirring blade 6 is driven. The surface (back surface) 6a on the rear side in the rotation direction of the above is configured to generate so-called cavitation.

As shown in FIGS. 6, 8 and 9, the partition plate 15 is formed in a substantially funnel shape having an outer diameter slightly smaller than the inner diameter of the stator 7. Specifically, the funnel-shaped partition plate 15 is provided with a funnel-shaped portion 15b opened at a cylindrical sliding contact portion 15a whose top protrudes in a cylindrical shape at the center thereof, and the funnel-shaped portion 15b is provided. The outer peripheral portion of the casing 1 is provided with an annular flat plate portion 15c that is orthogonal to the axis A3 of the casing 1 on both the front surface and the rear surface.
Then, as shown in FIGS. 6 and 7, the partition plate 15 has a plurality of locations at equal intervals in the circumferential direction in a posture in which the tubular sliding contact portion 15a at the top faces the front wall portion 2 side of the casing 1. It is attached to the attachment portion 5a on the front surface of the rotor 5 via the interval holding members 20 arranged at (4 locations in this embodiment).

As shown in FIGS. 7 and 9 (c), when the partition plate 15 is attached to the rotor 5 at a plurality of locations via the spacing member 20, the stirring blade 21 is placed on the rear wall portion 3 side of the casing 1. It is integrally assembled to the partition plate 15 in a facing posture, and when the rotor 5 is rotationally driven, the four stirring blades 21 are configured to rotate integrally with the rotor 5.

As shown in FIGS. 6 and 8, in this embodiment, the cylindrical second supply portion 17 is concentric with the casing 1 and is provided at the center of the front wall portion 2 of the casing 1. The second supply portion 17 is formed with a throttle portion 14a having a diameter smaller than the inner diameter of the circulation flow path 16 and a diameter smaller than the tubular sliding contact portion 15a of the partition plate 15 and having a small flow path area. As the stirring blade 6 of the rotor 5 rotates, the slurry-like liquid R is discharged through the discharge portion 12, and the liquid R is introduced through the throttle portion 14a of the second supply portion 17. , The inside of the suction stirring pump X is depressurized.

As shown in FIGS. 6 to 8, the first supply portion 11 has a casing in which the opening (entrance portion) opened in the casing 1 includes a part of the annular groove 10 in the circumferential direction. The front wall portion 2 is provided so as to be located on the lateral side of the opening of the second supply portion 17 with respect to the inside of 1. Further, the first supply portion 11 is provided on the front wall portion 2 of the casing 1 in an inclined posture in which the axial center A2 approaches the axial center A3 of the casing 1 as it approaches the front wall portion 2 of the casing 1. Incidentally, the inclination angle of the first supply unit 11 is about 45 degrees.
Then, in the present embodiment, the solid content P stored in the solid content storage hopper 31 can be sequentially supplied to the first supply unit 11 via the charging shutter 31a, and the first supply unit 11 can be sequentially supplied. A pressure gauge P1 for measuring the pressure in the introduction chamber 13 is provided.

As shown in FIGS. 6 and 8, the stator 7 is attached to the inner surface (the surface facing the rotor 5) of the front wall portion 2 of the casing 1, and the front wall portion 2 of the casing 1 and the stator 7 are integrally integrated. It is fixed so that it becomes. In the stator 7, the plurality of through holes 7a on the side of the first introduction chamber 13 arranged in the portion facing the first introduction chamber 13 are formed in a substantially circular shape, and the flow path area of the first introduction chamber 13 is formed. The total flow path area of the through holes 7a on the side of the plurality of first introduction chambers 13 is set to be smaller than that of the plurality of second introduction chambers 13, and the plurality of second holes are arranged in the portion facing the second introduction chamber 14. The through hole 7b on the introduction chamber 14 side is formed in a substantially elliptical shape, and the total flow path area of the plurality of through holes 7b on the second introduction chamber 14 side is smaller than the flow path area of the second introduction chamber 14. It is set to be. As the stirring blade 6 of the rotor 5 rotates, the slurry-like liquid R is discharged through the discharge unit 12, and the liquid R charged and stored in the liquid storage tank Y via the second supply unit 17. And the slurry-like liquid R returned to the liquid storage tank Y is introduced, so that the pressure inside the suction stirring pump X is reduced.

As shown in FIGS. 8 and 9, in this embodiment, each scraping blade 9 is formed in a rod shape, and the rod-shaped scratch is seen in the radial direction of the rotor 5 (the front and back directions of the paper surface in FIG. 9B). The tip side of the protruding wing 9 is located closer to the front wall portion 2, and the tip side of the rod-shaped scraped wing 9 is closer to the tip side of the rod-shaped scraped wing 9 in the axial direction of the rotor 5 (viewing the front and back of the paper surface in FIG. 9A). In an inclined posture located inward in the radial direction of the rotor 5, the base end portion 9B of the rod-shaped scraping blade 9 is fixed so as to rotate integrally with the rotor 5, and the rotor 5 is viewed in the axial direction thereof (FIG. 9 (a) is rotationally driven in a direction in which the tip of the scraping wing 9 is on the front side (direction indicated by an arrow in FIGS. 6 to 9).

The scraped blade 9 will be described with reference to FIGS. 7 to 9.
The scraped blade 9 has a base end portion 9B fixed to the partition plate 15, an intermediate portion 9M exposed to the first introduction chamber 13, and a tip portion fitted (that is, entered) into the annular groove 10. The portion 9T is formed in a rod shape provided in a series from the base end to the tip end.

As shown in FIGS. 7, 8 and 9 (b), the base end portion 9B of the scraping blade 9 is formed in a substantially rectangular plate shape.
As shown in FIGS. 7, 8, 9 (a) and 9 (b), the intermediate portion 9M of the scraped blade 9 is formed in a substantially triangular columnar shape having a substantially triangular cross-sectional shape ( In particular, see FIG. 7). Then, when the scraping blade 9 is provided in the inclined posture as described above, one side surface 9 m facing the front side in the rotation direction of the rotor 5 among the three side surfaces of the triangular columnar intermediate portion 9M (hereinafter, referred to as “radiation surface”). (May be) is a forward-sloping shape that inclines toward the front side in the rotation direction of the rotor 5, and also faces outward in the radial direction with respect to the radial direction of the rotor 5 (hereinafter, "diagonally outward"). (In particular, see FIGS. 8 and 9).

That is, when the rod-shaped scraping blade 9 is provided in the inclined posture as described above, the intermediate portion 9M exposed to the first introduction chamber 13 of the scraping blade 9 is fitted into the annular groove 10 from the tip portion 9T. Is located on the outer side in the radial direction of the rotor 5, and the divergence surface 9 m of the intermediate portion 9M facing the front side in the rotation direction is inclined toward the front side in the rotation direction of the rotor 5, and moreover, with respect to the radial direction of the rotor 5. It is tilted diagonally outward. As a result, the solid content P scraped from the annular groove 10 by the tip portion 9T of the scraping blade 9 is generated by the dissipation surface 9m of the intermediate portion 9M of the scraping blade 9 in the rotor 5 in the first introduction chamber 13. It is guided to flow outward in the radial direction.

As shown in FIGS. 8, 9 (a) and 9 (b), the tip portion 9T of the scraping blade 9 has a substantially square columnar shape having a substantially rectangular cross-sectional shape, and is in the axial direction of the rotor 5. In view (viewing the front and back of the paper surface in FIG. 9A), the outward side surface 9o of the four side surfaces facing the radial outward side of the rotor 5 faces the radial inward side of the inner surface of the annular groove 10. It is configured in an arc shape along the inner surface, and the inward side surface 9i on the radial inward side of the rotor 5 of the four side surfaces is along the outward inward surface facing the radial outward side on the inner surface of the annular groove 10. ing.
Further, of the four side surfaces of the square columnar tip portion 9T, the scraped surface 9f facing the front side in the rotation direction of the rotor 5 is inclined toward the front side in the rotation direction of the rotor 5, and moreover, with respect to the radial direction of the rotor 5. It is configured to face outward in the radial direction (hereinafter, may be referred to as "diagonal outward").
As a result, the solid content P scraped from the annular groove 10 by the tip 9T of the scraping blade 9 is directed outward in the radial direction by the scraping surface 9f of the tip 9T of the scraping blade 9. It will be released into the first introduction chamber 13.
Further, the tip surface 9t of the tip portion 9T of the scraping blade 9 is configured to be parallel to the bottom surface of the annular groove 10 in a state where the tip portion 9T is fitted into the annular groove 10.

Further, when the rotor 5 is rotationally driven in a direction in which the tip of the scraping blade 9 is on the front side in the axial direction (viewing the front and back of the paper surface in FIG. 9A), the base end portion of the scraping blade 9 is driven. A surface (back surface) 9a on the rear side in the rotation direction is formed on each of the 9B, the intermediate portion 9M, and the tip portion 9T. The back surface 9a is configured to generate so-called cavitation by rotating the scraping blade 9.

The four scraped wings 9 configured as described above are arranged in the circumferential direction with a central angle of 90 degrees at a central angle in an inclined posture as described above, and the base end portions 9B are respectively arranged. It is fixedly provided to the annular flat plate portion 15c of the partition plate 15.

As shown in FIG. 6, a partition plate 15 provided with a scraping blade 9 is attached to a mounting portion 5a on the front surface of the rotor 5 in a state of being separated from the front surface of the rotor 5 by a spacing member 20. 5 is arranged in the casing 1 in a state in which the tubular sliding contact portion 15a of the partition plate 15 is fitted into the second supply portion 17 so as to be slidably rotatably fitted.
As a result, a tapered second introduction chamber 14 having a smaller diameter toward the front wall portion 2 side of the casing 1 is formed between the bulging front surface of the rotor 5 and the rear surface of the partition plate 15. The supply unit 17 is configured to communicate with the second introduction chamber 14 via the tubular sliding contact portion 15a of the partition plate 15.
Further, an annular first introduction chamber 13 communicating with the first supply portion 11 is formed between the front wall portion 2 of the casing 1 and the front surface of the partition plate 15.

Then, when the rotor 5 is rotationally driven, the partition plate 15 rotates integrally with the rotor 5 in a state where the tubular sliding contact portion 15a is in sliding contact with the second supply portion 17, and the rotor 5 and the partition are rotated. Even when the plate 15 is rotated, the state in which the second supply portion 17 communicates with the second introduction chamber 14 via the tubular sliding contact portion 15a of the partition plate 15 is maintained.

[Control unit]
Although not shown, the control unit provided in this distributed mixing device is composed of a known arithmetic processing device including a CPU, a storage unit, and the like, and is configured to be able to control the operation of the suction stirring pump X constituting the distributed mixing device. There is.
In particular, the control unit is configured to be able to control the peripheral speed of the stirring blade 6 (rotational speed of the rotor 5), and the pressure in the first introduction chamber 13 and the second introduction chamber 14 is in a predetermined negative pressure state. As described above, by setting the peripheral speed of the stirring blade 6 (rotational speed of the rotor 5) and rotating the stirring blade 6 at the set peripheral speed (rotational speed of the rotor 5), at least the second stator 7 is second. The region in the wing chamber 8 immediately after passing through the through hole 7b on the introduction chamber 14 side (and the through hole 7a on the first introduction chamber 13 side) is continuously extended over the entire circumference in the wing chamber 8. It is configured so that it can be formed as a microbubble region in which a large number of microbubbles (microbubbles) of the liquid R are generated.
Here, a pressure gauge P2 for measuring the pressure in the first introduction chamber 13 (the same pressure as the pressure in the second introduction chamber 14) is provided.

[Operation of dispersion mixing device (manufacturing of slurry)]
Next, the operation (manufacturing of the slurry) of this dispersion mixing apparatus will be described with reference to the flowchart shown in FIG.
First, before starting the operation of the suction stirring pump X, a predetermined amount of the liquid R is charged into and stored in the liquid storage tank Y.

When the operation (high-speed operation) of the suction stirring pump X is started in this state, the inside of the suction stirring pump X becomes a negative pressure state, and the liquid charged and stored in the liquid storage tank Y in the second supply unit 17. R is supplied by being sucked under negative pressure via the circulation flow path 16.
In this state, a predetermined amount of solid content P is directly negatively charged from the solid content storage hopper 31 into the first introduction chamber 13 of the casing 1 of the suction stirring pump X from the first supply unit 11 via the charging shutter 31a. It is pressure-sucked to supply sequentially.
In the present embodiment, the solid content P is charged from the solid content storage hopper 31. However, the solid content P is charged into the liquid storage tank Y while the liquid R is circulated by the suction stirring pump X. You can also do it.

The solid content P supplied from the first supply unit 11 into the first introduction chamber 13 of the casing 1 of the suction stirring pump X is combined with the liquid R supplied to the second supply unit 17 and enters the blade chamber 8. It is introduced, becomes a slurry-like liquid R, is discharged from the discharge unit 12, and is returned to the liquid storage tank Y via the circulation flow path 18. Then, the slurry-like liquid R circulates by being sucked under negative pressure through the circulation flow path 16 while the suction stirring pump X is being operated.

Then, the slurry-like liquid R circulated and supplied to the second supply unit 17 enters the second introduction chamber 14 in a state where the flow rate is limited via the throttle portion 14a of the second supply unit 17. be introduced. In the second introduction chamber 14, it is subjected to a shearing action by a plurality of rotating stirring blades 21 to be further finely crushed, and further, it is also sheared when passing through the through hole 7b on the second introduction chamber 14 side. It is crushed by the action. At this time, it is introduced into the blade chamber 8 in a state where the flow rate is restricted through the through hole 7b on the side of the second introduction chamber 14. Then, in the blade chamber 8, the slurry-like liquid R, which is sheared by the stirring blade 6 rotating at high speed and is crushed to further reduce the agglomerates (lumps) of the solid content P, is discharged from the discharge unit 12. Will be done.

Here, the control unit is configured to be able to control the peripheral speed of the stirring blade 6 (rotational speed of the rotor 5) so that the pressure in the second introduction chamber 14 becomes a predetermined negative pressure state. By setting the peripheral speed (rotation speed of the rotor 5) and rotating the stirring blade 6 at the set peripheral speed (rotation speed of the rotor 5), at least on the second introduction chamber 14 side of the stator 7. The region in the wing chamber 8 immediately after passing through the through hole 7b is formed as a fine bubble region in which a large number of fine bubbles (microbubbles) of the liquid R are continuously generated over the entire circumference in the wing chamber 8. Can be done.
As a result, the liquid R that has permeated the agglomerates of the solid content P (so-called lumps) foams over the entire circumference in the wing chamber 8 to promote the crushing of the agglomerates, and further, the generated fine particles. The impact force when the bubbles are pressurized and extinguished in the wing chamber 8 further promotes the dispersion of the solid content P, and as a result, almost the entire slurry-like liquid R existing in the entire circumference in the wing chamber 8 is promoted. It is possible to produce a high-quality slurry-like liquid R in which the solid content P is well dispersed in the liquid R.

As a result, the liquid R that has permeated the agglomerates of the solid content P (so-called lumps) foams over the entire circumference in the wing chamber 8 to promote the crushing of the agglomerates, and further, the generated fine particles. The impact force when the bubbles are pressurized and extinguished in the wing chamber 8 further promotes the dispersion of the solid content P, and as a result, almost the entire slurry-like liquid R existing in the entire circumference in the wing chamber 8 is promoted. Therefore, it is possible to more reliably produce a high-quality slurry-like liquid R in which the solid content P is well dispersed in the liquid R.
That is, immediately after the air bubbles (cavities) due to cavitation generated in the back surface 9a of the scraped blade 9 in the negative pressure state pass through the through hole 7b on the second introduction chamber 14 side of the stator 7, in the blade chamber 8. By being crushed into finer bubbles by the stirring blade 6 rotating at high speed, the slurry-like liquid R becomes foam-like, and the solid content P (fibrous carbon powder) in the aggregated state is dissolved and dispersion is promoted. ..
Then, the foamy slurry-like liquid R moves to the outer peripheral portion of the wing chamber 8 by centrifugal force while being crushed by the stirring blade 6 rotating at high speed in the wing chamber 8 in this way. Then, it is discharged from the discharge unit 12, and during this period, the solid content P (fibrous carbon) in the aggregated state contained in the slurry-like liquid R due to the impact generated when the foam-like slurry-like liquid R returns to the liquid state. The powder) can further promote dispersion and produce a high-quality slurry-like liquid R in which the solid content P (fibrous carbon powder) is dispersed until it becomes primary particles.

[Operation of dispersion mixer (neutralization process)]
Next, the operation (neutralization treatment) of this dispersion mixing apparatus will be described.
While continuing the operation of the suction stirring pump X, the generated slurry-like liquid R stored in the liquid storage tank Y is neutralized.
In this neutralization treatment, the pressurized gas supply mechanism G introduces the pressurized carbon dioxide gas into the first introduction chamber 13 of the casing 1 which becomes the pressurized chamber through the valve V1 to form a slurry. A pressurized carbon dioxide gas is supplied to the liquid R, whereby the carbon dioxide gas is dissolved in the liquid R which has become a slurry under pressure.

Here, at least while the inside of the casing 1 is pressurized by the introduction of carbon dioxide gas, the pressing force against the mechanical seal 22 by the mechanical seal pressing mechanism Z is increased (increased) from the steady state, and the mechanical seal 22 is increased. To suppress the leakage of liquid (and gas) through.
Therefore, specifically, the mechanical seal is made immediately before the pressurized gas supply mechanism G introduces the pressurized carbon dioxide gas into the first introduction chamber 13 of the casing 1 which becomes the pressure chamber through the valve V1. By operating the actuators 25a and 25b composed of the air cylinders of the pressing mechanism Z, the pressing plate 24 is pressed, the urging force of the spring member 23 is changed, and the pressing force against the mechanical seal 22 is increased from the steady state. To do.

Further, while the pressurized gas supply mechanism G introduces the pressurized carbon dioxide gas into the first introduction chamber 13 of the casing 1 serving as the pressurizing chamber via the valve V1, the suction stirring pump X is operated. It is preferable to switch from high-speed operation to low-speed operation.

When the neutralization treatment is completed, the operation of the suction stirring pump X is stopped, and the pressure reducing valve V2 of the pressure reducing mechanism Pd is opened to reduce the pressure of the liquid storage tank Y (pressurized gas (carbon dioxide gas)) via the pressure reducing valve V2. (Release) is performed, and by this depressurization, the carbon dioxide gas supplied to and dissolved in the liquid R in the form of a slurry can be degassed.
In accordance with this, by operating the actuators 25a and 25b composed of the air cylinder of the mechanical seal pressing mechanism Z, the pressing operation of the pressing plate 24 is released, and the urging force of the spring member 23 is changed to the mechanical seal 22. Return the pressing force to the steady state (small pressing force).

[Operation of distributed mixer (deaeration process)]
Next, the operation (deaeration process) of this dispersion mixing device will be described.
In the neutralization step, the slurry-like liquid R stored in the neutralized liquid storage tank Y is degassed.
In this degassing treatment, inorganic carbon in the slurry can be degassed as carbon dioxide gas by causing cavitation.

This degassing process is performed by operating the suction stirring pump X (high-speed operation) for a predetermined time.
At this time, the liquid R in the form of a slurry stored in the neutralized liquid storage tank Y is supplied from the liquid storage tank Y. Since the degree of vacuum in the suction stirring pump X, that is, the first introduction chamber 13 and the second introduction chamber 14 is increased (here, the first introduction chamber 13 and the second introduction chamber 14 are solid content storage). When the closing shutter 31a of the hopper 31 is closed, the pressure is almost the same.) By rotating the stirring blade 6 at a set peripheral speed (rotation speed of the rotor 5), at least the first introduction of the stator 7 is introduced. The region in the wing chamber 8 immediately after passing through the through hole 7a on the chamber 13 side and the through hole 7b on the second introduction chamber 14 side is continuously formed into a slurry over the entire circumference in the wing chamber 8. By forming a microbubble region (a region where bubbles are generated by cavitation (local boiling)) in which a large number of fine bubbles (microbubbles) of the liquid R are generated, dispersion and mixing of the liquid R in a slurry form are promoted, and further, By the degassing action in the reduced pressure region where cavitation (local boiling) occurs, the inorganic carbon in the slurry liquid R can be separated as carbon dioxide gas.
As a result, the liquid R that has permeated the solid content P aggregate (so-called lump or step) foams over the entire circumference in the wing chamber 8 to promote the crushing of the aggregate, and further, the generation thereof. The impact force when the fine bubbles are pressurized and disappear in the wing chamber 8 further promotes the dispersion of the solid content P, and as a result, the liquid in the form of a slurry existing all around the inside of the wing chamber 8. A high-quality slurry having good dispersion can be produced over almost the entire area of R, and the inorganic carbon in the slurry can be degassed as carbon dioxide gas.
Then, the carbon dioxide gas separated from the slurry-like liquid R and degassed is introduced into the liquid storage tank Y together with the slurry-like liquid R and released through the pressure reducing valve V2 to perform the degassing treatment. The slurry-like liquid R is stored in the liquid storage tank Y.

Then, the slurry-like liquid R for which the degassing treatment has been completed is supplied to the subsequent steps via the discharge pipe 18a branched from the circulation flow path 18 by switching the valves V3 and V4.
After that, the operation of the suction stirring pump X is stopped.

In this way, while the pressurizing chamber is being pressurized, the pressing force by the mechanical seal pressing mechanism is increased, and more specifically, the mechanical seal pressing is performed when the pressurized gas is supplied by the pressurized gas supply mechanism. By increasing (increasing) the pressing force by the mechanism, depressurizing by the depressurizing mechanism, and then setting the pressing force by the mechanical seal pressing mechanism to a steady state, the seal part of the rotating shaft equipped with the stirring blade arranged in the pressurizing chamber can be made. It is possible to minimize the wear of the mechanical seal constituting the seal portion while suppressing the leakage of liquid or gas through the seal.

The stirring system of the present invention and its operating method have been described above based on the embodiment thereof, but the present invention is not limited to the description of the above embodiment and is a horizontal axis type provided with a pressurizing chamber. In addition to the dispersion mixing device of the above, the same can be applied to the vertical axis type dispersion mixing device proposed by the applicant in Japanese Patent Application No. 2016-093672 and the seal portion of the rotating shaft provided with the stirring blade of the existing stirring device. Etc., the configuration can be changed as appropriate within the range that does not deviate from the purpose.

In the stirring system and its operating method of the present invention, the mechanical seal constituting the sealing portion is worn while suppressing leakage of liquid or gas through the sealing portion of the rotating shaft provided with the stirring blade arranged in the pressurizing chamber. In addition to the production of various slurries, including the production of positive slurry for non-aqueous electrolyte secondary batteries, which is agitated under pressure, the solid content of the liquid can be minimized. Can be suitably used for applications of a dispersion mixing apparatus that disperses and mixes the above.

G Pressurized gas supply mechanism Pd Decompression mechanism M Pump drive motor P Solid content R Liquid X Suction agitation pump Y Liquid storage tank (liquid supply mechanism)
Z Mechanical seal holding mechanism 1 Casing (pressurizing chamber)
5 Rotor 6 Stirring blade 6a Back surface 7 Stator 7a Squeezing flow path (through hole)
7b Aperture flow path (through hole)
8 Tsubasa chamber (discharge chamber)
9 Scraping blade 10 Circular groove 11 1st supply part 12 Discharge part 13 1st introduction room 14 2nd introduction room 14a Squeezing part 15 Partition plate 16 Circulation flow path 17 2nd supply part 18 Circulation flow path 19 Pump Drive motor drive shaft (rotary shaft)
20 Interval holding member 21 Stirring blade 22 Mechanical seal (seal part)
23 Spring member 24 Press plate 25a Actuator 25b Actuator 26 Guide pin 31 Solid content storage hopper 31a Input shutter

Claims (6)

Pressurized chamber and
A rotating shaft having a stirring blade arranged in the pressurizing chamber and
A pressurized gas supply mechanism that supplies pressurized gas to the pressurizing chamber,
A mechanical seal arranged between the pressurizing chamber and the rotating shaft to prevent fluid leakage from the pressurizing chamber,
It has a mechanical seal pressing mechanism that presses the mechanical seal that can change the pressing force against the mechanical seal.
A stirring system characterized in that while the pressurized gas is supplied into the pressurizing chamber by the pressurized gas supply mechanism, the pressing force by the mechanical seal pressing mechanism is increased more than in a steady state. The stirring system according to claim 1, wherein the pressurized gas supply mechanism supplies carbon dioxide gas as a pressurized gas. The slurry is neutralized by supplying pressurized carbon dioxide gas to the slurry-like liquid stored in the liquid storage tank, and the neutralized slurry is depressurized and degassed by a decompression mechanism, and the mechanical The seal pressing mechanism strengthens the pressing force of the mechanical seal during the neutralization treatment of the slurry as compared with the degassing treatment, and after depressurizing by the depressurizing mechanism, the pressing force of the mechanical seal is brought into a steady state. The stirring system according to claim 2, wherein the stirring system is characterized in that. Any of claims 1 to 3, wherein the pressing force is increased from the steady state by the mechanical seal pressing mechanism before the pressurized gas supply mechanism supplies the pressurized gas to the pressurizing chamber. The stirring system according to item 1. When the pressurized gas is supplied to the pressurized chamber by the pressurized gas supply mechanism, the rotation speed of the rotating shaft is switched to low speed operation as compared with the case where the pressurized gas is not supplied. The stirring system according to any one of claims 1 to 4. Pressurized chamber and
A pressurized gas supply mechanism that supplies pressurized gas to the pressurizing chamber,
A rotating shaft having a stirring blade arranged in the pressurizing chamber and
A mechanical seal arranged between the pressurizing chamber and the rotating shaft to prevent fluid leakage from the pressurizing chamber,
A method of operating a stirring system having a mechanical seal pressing mechanism for pressing a mechanical seal capable of varying the pressing force on the mechanical seal.
A method of operating a stirring system, characterized in that the pressing force of the mechanical seal pressing mechanism is increased more than in a steady state while the pressurized gas is being supplied into the pressurizing chamber by the pressurized gas supply mechanism.

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