JP2005053589A - Liquid supplying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an inclusion in a fluid from sticking on a flow control valve, and also, to make complete exfoliation elimination of a deposit simply and easily, even though there is the sticking, and in addition, to eliminate fear of incorporation of various kinds of minor germs and dust into the inside of a liquid tank. <P>SOLUTION: This device is provided with a hermetic liquid tank 21, a liquid influent passage 22 and a liquid effluent passage 23 connected to this liquid tank 21, each of flow control valves 24 and 25 provided in each of these passages 22 and 23 and a pressurizing 29 and a decompressing valves 30 mounted on the hermetic liquid tank 21, and this device comes to compose by providing at least one piston which is made an advancing and retreating displacement in the radial direction of its flexible tube by arranging the above respective flow control valves 24 and 25 on the outside of the flexible tube, and also, by providing a driving means which displaces the piston at least in the advancing direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a liquid supply device using a flow rate control valve, and in particular, makes it easy to completely remove internal deposits and eliminates the possibility of contamination such as germs and dust in the liquid tank. To do.

  Flow control valves such as throttle valves, flow control valves, and diversion valves that have been widely used in the past have many parts that come into contact with the fluid, and the shape of the passage is complex, so the interior of the flow control valves is difficult to clean. Therefore, it is practically impossible to completely remove deposits on moving parts, fluid passages, etc. simply by letting cleaning water pass through. For this reason, it is often necessary to disassemble and clean the flow control valve. Therefore, the deposits were completely removed.

  However, many work steps are required to disassemble and clean the flow control valve, and especially when the flow control valve is applied to the transportation of drinking water, liquor, liquid seasonings, etc. In the assembly and the like after the disassembly and cleaning, there are cases in which the falling bacteria from the worker, the adhering of floating dust, etc., become a sanitary problem.

  Moreover, among liquid supply devices using flow control valves, for example, those attached to an automatic filling bag making machine for liquid seasonings, conventionally, an upper lid of a tank for temporarily storing liquid seasonings However, it is usually an open / closed structure instead of a closed type so as to respond to requests such as monitoring to avoid troubles due to running out of liquid and cleaning of the tank itself. Also, there is a problem that germs, dust, and the like fall into the tank due to opening and closing of the upper lid during the filling bag making operation.

  The present invention was made as a result of studying as a subject to solve such problems of the prior art, and its main purpose is to effectively prevent adhesion of fluid contents to the flow control valve. In addition, for example, even if it adheres, the deposits can be removed easily, quickly and completely, and at the same time, the possibility of entry of germs and dusts can be sufficiently removed. It is in providing the liquid supply apparatus using a flow control valve.

The flow control valve that can be used in the liquid supply apparatus of the present invention is provided with at least one piston that is advanced and retracted in the radial direction of the soft tube outside the soft tube, and the piston is displaced at least in the advance direction. Drive means, for example, a cylinder, a gear mechanism and the like are provided.
Here, preferably, the piston is disposed at two locations opposed to the diametrical direction of the soft tube, and more preferably, the piston is connected to the housing by a flexible film body, and the flexible film body A pressurized fluid supply / exhaust port is provided in a closed space defined on the back side of the piston, that is, a rear end side of the piston, and the closed space and the flexible film body are provided with the pressurized fluid supplied to the supply / exhaust port. To function as a piston advance drive means.

  Preferably, the flexible membrane body connecting the piston to the housing defines a closed space on each of the back surface side and the front surface side, and a pressurized fluid supply / discharge port is provided in each of these closed spaces, As described above, the closed space and the flexible membrane body contributing to the definition of the piston are used as the advancing drive means of the piston, while the closed space on the front side and the flexible membrane body contributing to the definition of the piston are used as the piston driving means. It functions as a backward drive means. More preferably, a spring force for returning the piston to the retracted position is applied to the flexible film body. Here, the application of the spring force is to configure the flexible film body itself with a spring material, to locally attach a spring material such as a leaf spring to the flexible film body, It can be performed by directly or indirectly seating a compression or tension type coil spring or the like.

  In many of these flow control valves, it is preferable that the outer periphery of the soft tube is covered with an elastic cover, and the elastic cover is formed by a plurality of O-rings juxtaposed in the axial direction of the soft tube or by a sheath tube. The O-rings can be either bonded or non-bonded to the soft tube.

The liquid supply device of the present invention used for the flow rate control valve as described above includes a sealed liquid tank, a liquid inflow passage and a liquid outflow passage connected to the liquid tank, and respective flow rate controls provided in the respective passages. And a pressure control valve and a pressure reducing valve attached to the sealed liquid tank, each flow control valve being disposed outside the soft tube as described above, At least one piston that is displaced forward and backward in the radial direction is provided, and driving means that displaces the piston in at least the advancing direction is provided.
Preferably, at least the flow rate control valve disposed in the liquid inflow passage is provided with a driving means for displacing the piston in the advance direction and a driving means for displacing the piston in the backward direction. It should be noted that the flow control valve disposed in the liquid outflow passage may be provided with only drive means for displacing the piston in the advance direction.

In this flow control valve, the fluid passage is constituted by a soft tube that can be made of other polymer material such as silicone or silicone rubber, and the inside surface of the passage is made sufficiently smooth, and By using the soft tube as a straight tube and removing irregularities, detours, and the like from the fluid passage, it is possible to effectively prevent adhesion of fluid aggregates and the like thereto. In addition, here, by adjusting the amount of crushing deformation of the soft tube, and hence the flow rate of the fluid passing therethrough, by the advance and retreat displacement of the piston disposed outside the soft tube, the valve configuration of the passing fluid other than the soft tube is adjusted. Contact with parts can be prevented, and the risk of adhesion of aggregates and the like to those parts can be completely removed.
On the other hand, even if aggregates or the like may adhere to the fluid passage, the soft tube made of synthetic resin is excellent in peelability due to its physical properties. The agglomerates and the like can be peeled and removed completely and simply by passing the fluid there.

By the way, as the drive means for bringing the displacement of the piston as required, various known reciprocating drive means can be used as long as the displacement amount can be appropriately adjusted.
Further, here, when the pistons are arranged at two positions opposed to the diameter direction of the soft tube, the responsiveness of the flow rate control can be greatly enhanced by simultaneously moving both of them forward and backward.

Further, the piston is connected to the housing by a flexible membrane body, and a pressurized fluid supply / exhaust port is provided in a closed space defined on the back side of the flexible membrane body, whereby the pressurized fluid supply / exhaust port is provided. For example, the compressed air supplied to the closed space functions as a piston advance drive source, so that it is not necessary to attach a special drive means to the flow control valve itself, and the structure of the flow control valve is reduced. It can be simplified and the whole can be miniaturized.
In this case, the flow rate control is performed directly and indirectly by the backward pressing force that the fluid flowing in the soft tube exerts on the piston through the soft tube and the compressed air supplied to the closed space. If the piston's advancing direction pressing force overcomes the retreating direction pressing force based on the internal pressure in the closed space, the piston's advancing displacement, and consequently A reduction in the fluid flow rate is provided, and the piston is stopped and maintained at a position where the advancing direction pressing force acting on the piston and the backward direction pressing force are balanced. On the other hand, the increase in the fluid flow rate is performed by lowering the internal pressure of the closed space and moving the piston back to a position where the advancing direction pressing force acting on the piston balances the retreating direction pressing force. When the inside of the closed space pressure is reduced to atmospheric pressure, the amount of crushing deformation of the soft tube becomes zero and the fluid flow rate becomes maximum.

  In such a flow rate control valve, the closed space is defined on each of the back surface side and the front surface side of the flexible membrane body, and a pressurized fluid supply / exhaust port is provided in each of the closed spaces. In addition, when the pressurized fluid supplied to the front side closed space is caused to function as a piston backward drive source, the forward / backward displacement speed of the piston can be controlled as required. In other words, when a closed space is provided only on the back side of the flexible membrane body, the piston is quickly displaced to the required advance or retract position by directly setting a predetermined internal pressure there. However, when a closed space is also provided on the front surface side of the flexible membrane body, the piston reaches a position where the both pressing forces acting on it are balanced by adjusting the internal pressure difference between the two closed spaces. The displacement speed in each of the forward and backward directions can be appropriately controlled.

  Furthermore, when the flexible membrane body is provided with a spring force for returning the piston itself, and consequently the piston, to the retracted position, the closed side on the back side is closed regardless of whether the closed space is one or two. When the internal pressure of the space becomes zero, the crushing deformation of the soft tube can be reliably removed without depending on the backward pushing force exerted on the piston by the flowing fluid, for example, the fluid passes through the flow control valve. Prior to this, the flow control valve can be fully opened.

By the way, in such a flow control valve, in many cases, a gap exists between the valve housing and the soft tube. Therefore, the soft tube is inscribed in or inscribed in the gap portion. By covering with an elastic cover, the soft tube is swelled in the radial direction when the inside of the soft tube is washed with a high-pressure fluid, for example, steam at a pressure of about 2 kgf / cm ² at a temperature of about 130 to 140 ° C. It is possible to effectively restrain the deformation and improve the pressure resistance and improve the fatigue resistance. Here, when the elastic cover is composed of a plurality of O-rings, the elastic cover can be easily and easily mounted without the need for preparation or processing of special parts. In the case where it is constituted by a sheath tube, the soft tube can be protected sufficiently equally in each part in the length direction.

In addition, in the liquid supply device according to the present invention to which the flow control valve as described above is applied, the operation effect inherent to the flow control valve can be exhibited as it is as the entire device as well, such as liquid aggregates. In addition to effectively preventing adhesion to the apparatus, even if agglomerates or the like adhere, complete removal thereof can be performed very easily.
In addition, in this apparatus, the liquid tank is a closed tank, and the lid is basically not opened and closed during the liquid supply operation. Therefore, the opening and closing sufficiently eliminates the possibility that germs and dusts may enter the tank. be able to.

  By the way, in this apparatus, when each of the drive means for moving the piston forward and the drive means for moving it backward is provided in the flow rate control valve in the liquid inflow passage for supplying the liquid to the sealed liquid tank, As described above, the forward / backward displacement speed of the piston can be controlled as required. For this reason, for example, when the flow control valve in the fully closed state is opened and the liquid flows into the sealed liquid tank. By opening the flow control valve slowly and bringing the flow of liquid into the closed liquid tank or dropping it closer to the static state, it is possible to effectively prevent sudden fluctuations in the internal pressure of the closed liquid tank, preferably maintaining the internal pressure constant. Thus, the amount of liquid discharged therefrom can be made sufficiently uniform based on the tank internal pressure.

  This is almost the same even when the flow control valve is fully closed after the amount of liquid in the sealed liquid tank reaches a predetermined amount. It is possible to effectively prevent fluctuations in internal pressure.

  By the way, with respect to the gradual decrease of the tank internal pressure due to the continuation of the discharge of the liquid in the tank, it is caused by the inflow of the liquid into the tank by bringing the pressure inside the tank through the pressurizing valve attached to the tank. With respect to the gradual increase of the tank internal pressure, the tank internal pressure can be maintained substantially constant by causing the tank internal pressure to gradually decrease under the action of the pressure reducing valve attached to the tank.

  Here, the flow control valve in the liquid outflow passage connected to the sealed liquid tank can of course be configured in the same manner as the flow control valve described above, but the opening and closing operation of the flow control valve is as follows: The tank pressure does not change so rapidly, and the flow rate control valve is often maintained in an open state with a predetermined opening. When applied to a machine, the faster the flow rate control valve opens and closes, the less the loss of the packaging film can be reduced. It is also possible to provide.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a longitudinal sectional view or a transverse sectional view showing an embodiment of a flow control valve.
In the figure, reference numeral 1 denotes a soft tube, for example, a tube made of silicone, silicone rubber, or the like. This silicone tube 1 includes a pair of flanged inserts 2 fitted to both ends thereof, and an insertion portion of the insert 2. The end portions are held liquid-tight by the flanged sleeve 3 fixed to the outer periphery of each end portion by, for example, caulking.

  On the outer peripheral side of the central portion of the silicone tube 1, a valve frame body 4 having a substantially cylindrical shape or a rectangular tube shape as a whole is fixed to a flange 3 a provided on each sleeve 3 at its end face. The pistons 5 are disposed at two positions of the body 4 opposite to the diameter direction of the silicone tube 1 so as to be able to move forward and backward in the radial direction of the tube 1, and at the tip of each piston 5, A pressing member 6 that contacts the outer peripheral surface is provided. The pressing member 6 has a width that slightly exceeds the diameter of the silicone tube 1, and has a length in a direction perpendicular to the paper surface as shown in the figure, and its tip end surface forms a flat surface over the entire width.

  Further, here, for example, the edge portion of the central through hole of the flexible film body 7 is airtightly connected to the rear end portion of each piston 5, and the outer peripheral edge portion of the flexible film body 7 is connected to the valve frame body 4. The piston 5 is attached to the housing 9 including the valve frame body 4 and the respective lid bodies 8 by the flexible film body 7 by, for example, airtightly holding the lid body 8 between the lid bodies 8 fitted thereto. In addition, an airtight closed space 10 is defined between the flexible film body 7 and the flexible film body 7 and the lid body 8. Here, the flexible film body 7 can be formed of a gas-impermeable rubber, a synthetic resin material, or the like, with or without a reinforcing layer embedded therein, and the piston 5 is formed on these materials as shown in the figure. It can also be constituted by a composite member provided with a spring member for returning to a retreat position or by an elastic film body itself that self-returns to a shape as shown.

  Further, each lid body 8 is provided with a pressurized fluid supply / discharge port 11 that opens into the closed space 10, and the supply / discharge port 11 is connected to a pressurized fluid supply / discharge unit (not shown) such as a pressurized air supply / discharge unit. To do. In this case, air flows into and out of the space 12 between the flexible membrane body 7 and the valve frame body 4 between the piston 5 and the sliding guide 13 provided in the valve frame body 4 and the valve frame body. This can be done through at least one of the through holes (not shown) provided in FIG.

  In the flow control valve configured as described above, when the flow rate of the fluid flowing in the silicone tube is reduced, pressurized air is supplied into the closed space, and the piston 5 is connected to the piston 5 via the pressing member 6. The force applied in the backward direction received from the silicone tube 1 and, in some cases, the force in the advancing direction that overcomes the deformation resistance of the flexible film body 7 are applied to the pistons 5 in synchronism with each other. The speed is changed in the advancing direction, and the pressing member 6 causes the silicone tube 1 to be constricted from the vertical direction in the figure. This reduces the fluid flow path cross-sectional area in the silicone tube and also reduces the fluid flow rate as expected.

  Here, such a decrease in the fluid flow rate is caused by the fact that both pistons 5 are advanced and displaced to their advance limit positions, and the silicone tube 1 is completely crushed as shown in FIG. Can be appropriately selected according to need. In addition, in the case of such a crushing deformation of the silicone tube 1, the inserts 2 inserted into both end portions thereof function to effectively prevent the silicone tube 1 from being expanded.

  On the other hand, when increasing the flow rate of the fluid, for example, from the state shown in FIG. 2, the internal pressure of the closed space is gradually or quickly reduced, and the pushing force in the advancing direction of the piston 5 is changed to the silicone tube 1 and eventually the internal pressure. By making it smaller than the backward pressing force exerted on the piston 5 by the fluid, it is possible to increase the cross-sectional area of the flow path at the required speed, in other words, increase the fluid flow rate.

  By the way, the silicone tube 1 of such a flow rate control valve has a sufficiently smooth inner surface, is difficult to adhere to fluid aggregates due to its physical properties, and defines a linear fluid flow path. Further, it is possible to effectively prevent the fluid aggregates and the like from adhering to the inner surface for a long period of time and sufficiently prevent the fluid flow rate from fluctuating.

  On the other hand, even if fluid agglomerates may adhere to the inner surface of the silicone tube 1, most of the adhering matter is constricted and deformed with some expansion of itself based on the action of the flow control valve. And it will peel from there by expansion-diameter deformation | transformation accompanying shrinkage. Moreover, since the silicone tube 1 originally has physical properties that are excellent in the peelability of deposits, and there is no possibility that aggregates or the like adhere to the outside of the silicone tube 1, for example, high-pressure washing By allowing the fluid to pass therethrough, all of the deposits can be removed and removed easily and quickly. Thus, it is not necessary to disassemble and clean the valve in order to remove the deposits. Therefore, there is a sufficient risk of contamination of the valve components, such as germs and dust, when assembling the valve after cleaning. Can be removed.

  FIG. 3 is a cross-sectional view showing another embodiment of the flow control valve, which is also sufficiently airtight on the front side of the flexible membrane body 7 and the space defined by it and the valve frame body 4. A pressurized fluid supply / exhaust port 15 that opens to the closed space 14 is provided in the valve frame body 4, and the pressurized fluid supply / exhaust port 15 is, for example, a pressurized air supply / discharge unit (not shown). Etc. are connected.

In such a flow rate control valve, the piston 5 is adjusted by adjusting the internal pressure difference between the back side closed space 10 and the front side closed space 14 in consideration of the force for pressing the piston 5 in the backward direction. The forward / backward displacement speed can be controlled as required. That is, when opening the valve, for example, the front side closed space 14 is set to a predetermined internal pressure, while the back side closed space 10 is set at a required speed from the initial set internal pressure that is balanced with the internal pressure and the like. By gradually reducing the pressure, and when closing the valve, for example, this is also an initial setting in which the back side closed space 10 is set to a predetermined internal pressure, while the front side closed space 14 is balanced with the internal pressure. By depressurizing from the internal pressure at a required speed, the displacement speed of each direction of the piston 5 can be accurately controlled as expected.
And also in this valve, regarding the adhesion and separation / removal of fluid agglomerates and the like, it is possible to bring about the same effect as described above.

  By the way, in the above-described embodiments of the flow control valve, as is apparent from the cases shown in FIGS. 1 and 3, Since a gap exists between the valve frame body 4 and the elastic cover that covers the silicone tube 1 is disposed in the gap portion, the silicone tube 1 can be removed from its expanded deformation with the elastic cover. It is preferable to protect.

FIG. 4 is a cross-sectional view showing an embodiment of the elastic cover. Here, the elastic cover is constituted by a plurality of O-rings 16 fitted to the outer periphery of the silicone tube 1 and juxtaposed in the axial direction thereof. To do. Here, each O-ring 16 can be adhered to the peripheral surface of the silicone tube 1, but when the O-ring 16 is fitted to the silicone tube under a slight expansion deformation, the O-ring 16 is between them. In such a case, it is possible to sufficiently prevent unexpected displacement of the O-ring 16 in the tube axis direction without adhering both of them. .
Here, the O-ring 16 can be disposed not only between the main body portion of the piston 5 and the silicone tube 1 but also between the pressing member 6 and the silicone tube 1. When 6 is in direct contact with the outer peripheral surface of the silicone tube 1 from the vertical direction thereof, the pressing member 6 also functions as a protective member for the silicone tube 1. Can be omitted.
Here, it is preferable that the outer peripheral surface or the outer peripheral edge of each O-ring 16 is inscribed in the valve frame 4, but each O-ring itself has an enlarged diameter of the silicone tube 1 under its own physical properties. This is not essential because the deformation restraining force can be effectively exerted against the deformation.

In such an elastic cover, a high-temperature and high-pressure fluid, for example, water vapor having a pressure of about ² kgf / cm ² at a temperature of about 130 to 140 ° C. is used for cleaning the inside of the flow control valve, and hence the inner peripheral surface of the silicone tube 1. When passing therethrough, the expansion of the silicone tube 1 can be effectively restrained by the respective O-rings 16, so that the amount of diameter expansion deformation of the silicone tube 1 during repeated cleaning is sufficiently small. At the same time, the pressure resistance of the silicone tube 1 can be increased, and the fatigue resistance can be greatly improved.

  By the way, the elastic cover made of the O-ring 16 is deformed long in the direction perpendicular to the paper surface of FIG. 5 when the silicone tube 1 is crushed and deformed as shown in FIG. 5, in other words, when the flow control valve is closed. Since each O-ring 16 sufficiently absorbs unnecessary loosening or slack, each O-ring 16 is in the axial direction of the silicone tube 1 even when they are not bonded to the silicone tube 1 or the like. The displacement to is sufficiently prevented.

  As described above, when the elastic cover is configured by the O-ring 16, the elastic cover can be configured easily, easily, and inexpensively without the need to prepare special parts or process the parts. The durability of the silicone tube 1 can be effectively improved.

FIG. 6 is a cross-sectional view showing another embodiment of the elastic cover, in which a sheath tube 17 made of rubber, plastic or the like is disposed between the silicone tube 1 and the valve frame body 4, preferably in the diameter increasing direction. The elastic cover is formed by being arranged under some elastic deformation.
The sheath tube 17 here can also function in substantially the same manner as the above-described elastic cover under adhesion or non-adhesion to the silicone tube 1 and inscribed or non-inscribed to the valve frame body 4. However, here, since the sheath tube 17 is preferably in close contact with the silicone tube 1 over its entire length, the diameter expansion deformation of the silicone tube 1 is more evenly suppressed in any portion when the inner peripheral surface is subjected to high-pressure cleaning. can do.

  Although the application mode of the elastic cover to the flow control valve shown in FIG. 1 has been described above, it goes without saying that the elastic cover can also be applied to the flow control valve shown in FIG.

FIG. 7 is a circuit diagram illustrating a liquid supply apparatus for an automatic filling bag making machine using the flow rate control valve as described above.
Here, the liquid tank is a sealed liquid tank 21, a liquid inflow passage 22 for supplying liquid to the sealed liquid tank 21 from the primary side tank, and liquid from the sealed liquid tank 21 to the automatic filling bag making machine. 3 is connected to the liquid inflow passage 23. The flow rate control valve 24 shown in FIG. 3 is connected to the liquid inflow passage 22, and the flow rate control valve 25 shown in FIGS. Provide. Here, the back side closed space 10 and the front side closed space 14 of the flow control valve 24 are connected to the respective electropneumatic converters 26 and 27, and the back side closed space 10 of the flow control valve 25 is connected to the other One electropneumatic converter 28 is connected. Each of these electropneumatic converters 26, 27, and 28 is supplied with compressed air from, for example, compressed air supply means.

  The sealed liquid tank 21 is also provided with a pressurizing valve 29 connected to the compressed air supply means and a pressure reducing valve 30 for discharging the tank internal pressure, and a pressure gauge 31 is attached. Both level sensors 32 for detecting the lowest level and the highest level are attached. Here, the level sensor 32 is signal-connected to the electropneumatic converters 26 and 27 via the level switch amplifier 33 and the output gradient setting unit 34.

  The liquid supply to the automatic filling bag making machine by such a liquid supply device is performed under the action of the pressure increasing / decreasing valves 29 and 30 while maintaining the internal pressure of the sealed liquid tank 21 at a predetermined constant value. The measured flow rate input from the electromagnetic flow meter 35 provided on the downstream side of the flow rate control valve 25 to the flow rate controller 36 is compared with the set flow rate, and when the difference between the two exceeds a predetermined range, electro-pneumatic conversion is performed. This is performed by pressurizing or depressurizing the back side closed space 10 by means of the device 28 so that the measured flow rate substantially matches the set flow rate.

And, if the liquid level in the tank decreases due to such continuous supply of liquid, the tank internal pressure also decreases, so in such a case, supply pressurized air from the pressure valve 29 into the tank, Maintain the internal pressure of the tank and thus maintain the liquid supply flow rate.
Also, here, when the liquid level in the tank further decreases and the detection result by the level sensor 32 is below the minimum level, the output gradient setting device 34 is operated via the level switch amplifier 33, The difference in pressure supplied from the electro-pneumatic converters 26 and 27 to each of the back side closed space 10 and the front side closed space 14 of the flow control valve 24 is gradually increased within a set time to control the flow rate. The valve 24 is loosely opened, thereby preventing a rapid increase in the internal pressure of the tank due to a large amount of liquid flowing into the tank rapidly and continuously supplying it to the automatic filling bag making machine. Thoroughly eliminate the risk of changes in the flow rate of liquid.

  By the way, when the liquid is supplied into the sealed liquid tank in this way, the tank internal pressure gradually increases as the space volume in the tank decreases, but in this case, the increase in the tank internal pressure is Since the oil is discharged out of the tank through the pressure reducing valve 30, the tank internal pressure is maintained substantially constant.

  Further, when the liquid level in the tank reaches the maximum level due to the inflow of liquid into the tank, the flow control valve 24 is also gently closed by the action of the output gradient setting device 34, This avoids sudden fluctuations in the tank internal pressure and effectively prevents fluctuations in the amount of liquid supplied to the automatic filling bag making machine.

  In the liquid supply apparatus as described above, it is not necessary to open the lid member 21a of the sealed liquid tank 21 during the liquid quantitative supply operation. Therefore, germs, dust, etc. fall into the tank during the liquid quantitative supply. I don't have to. Further, even when removing deposits such as liquid agglomerates, the flow rate control valves 24 and 25 are simply passed through the tank without passing through the lid member 21a and only by passing a high-pressure cleaning fluid such as water vapor. In the same manner as described above, since the adhering material can be sufficiently peeled and removed, it is possible to completely remove the possibility of adhesion of germs and the like caused by fitting the lid member 21a after the inside of the tank after the cleaning. Can do.

  Thus, according to the flow control valve described above, it is possible to effectively prevent the accumulation of fluid agglomerates and the like on the flow control valve and to control the fluid flow rate sufficiently accurately over a long period of time. Even if aggregates adhere to the flow control valve, it is possible to completely remove and remove the deposit without disassembling and cleaning the valve, so that bacteria, dust, etc. adhere to the flow control valve. Can eliminate the fear.

  The same applies to the liquid supply apparatus of the present invention using the flow rate control valve. The liquid tank is a closed tank, and during the fixed supply of the liquid, of course, the adhering matter to the closed liquid tank. In the removal operation, the tank lid member is maintained in a completely closed state to effectively prevent germs and dust from falling into the tank, and the tank and the flow control valve are attached to the tank. The kimono can be removed sufficiently.

It is sectional drawing which illustrates the flow control valve which can be used for this invention. It is sectional drawing which shows the flow-path interruption | blocking state of a flow control valve. It is sectional drawing which shows the other example of a flow control valve. It is sectional drawing which shows the application form of an elastic cover. It is sectional drawing which shows the deformation | transformation state of an elastic cover. It is sectional drawing which shows other embodiment of an elastic cover. It is a circuit diagram which illustrates the liquid supply apparatus concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Silicone tube 2 Insert with flange 3 Sleeve, 3a Flange 4 Valve frame body 5 Piston 6 Pressing member 7 Flexible film body 8 Cover body 9 Housing 10 Back side closed space 11, 15 Pressurized fluid supply / discharge port 13 Sliding guide 14 Front side closed space 16 O-ring 17 Sheath tube 21 Sealed liquid tank, 21a Lid member 22 Liquid inflow passage 23 Liquid outflow passage 24 Flow rate control valve 25 Flow rate control valve 29 Pressurizing valve 30 Pressure reducing valve 31 Pressure gauge 32 Level sensor 35 Current flow meter

Claims (2)

A sealed liquid tank, a liquid inflow passage and a liquid outflow passage connected to the liquid tank, respective flow control valves provided in the respective passages, and a pressurization valve and a pressure reduction valve attached to the sealed liquid tank, Each flow control valve is disposed outside the soft tube, and provided with at least one piston that is advanced and retracted in the radial direction of the soft tube, and driving means for displacing the piston at least in the advance direction. A liquid supply apparatus configured by providing. 2. The liquid supply apparatus according to claim 1, wherein at least a driving means for displacing the piston in the advancing direction and a driving means for displacing the piston in the retreating direction are provided on the flow rate control valve disposed in the liquid inflow passage.

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