JP5196226B2 - Inner bag suction prevention device and pumping device - Google Patents

Description

  The present invention can be applied to high-viscosity liquids such as paste-like or cream-like caulking agents, sealing agents, vibration-damping agents, ointments, and the like contained in inner bags mounted in containers such as drums and pail cans, and water. The present invention relates to a pumping device that can suck and pump various fluids such as a low-viscosity liquid having a close viscosity, and an inner bag suction preventing device that can be used for such a pumping device.

  An example of a conventional pumping apparatus will be described with reference to FIG. This pumping device 1 allows a fluid 4 such as a caulking agent contained in an inner bag (for example, a plastic bag) 3 mounted in a container 2 such as a pail can to be fed from a fluid suction port 5 a of a pump device 5. The air can be sucked and discharged from the fluid outlet 5b. A follow plate 6 is attached to the suction port 5c of the pump device 5 substantially horizontally. This follow plate 6 is, for example, a substantially disk-shaped body, and is made of closed cell foamed urethane. The follower plate 6 has an outer peripheral part 6 a that is in contact with the inner surface of the substantially short cylindrical side wall 2 b of the container 2 through the inner bag 3, and the follower plate 6 has an outer peripheral part 6 a and an inner surface of the inner bag 3. The contact portion is sealed.

  The reason why the fluid 4 is housed in the inner bag 3 is to prevent the fluid 4 from contacting and solidifying (curing) with moisture in the air. The upper opening end of the inner bag 3 is fastened to the upper edge of the container 2 with a band 7 so that the inner bag 3 does not slide down. FIG. 9 shows the operation of pumping out the fluid 4 in the inner bag 3 attached to the container 2 using the pumping device 1, and the follow plate 6 approaches the bottom surface 2 a of the container 2. It shows the state.

  When the fluid 4 in the inner bag 3 mounted on the container 2 is pumped out using the pumping device 1, first, for example, as shown by a one-dot chain line in FIG. The bottom surface of the follow plate 6 is brought into contact with the surface of the fluid 4 accommodated in the inner bag 3. In this state, the suction opening 5c of the pump device 5 is attached to the central opening 6b of the follow plate 6, and then the pump device 5 is operated. As a result, the fluid 4 can be sucked from the fluid suction port 5a of the pump device 5 and allowed to flow out from the fluid outlet 5b.

  Then, when the fluid 4 in the inner bag 3 is pumped out in this way and the fluid 4 in the inner bag 3 is reduced, as shown in FIG. Since the pump device 5 attached thereto is automatically lowered by its own weight, for example, the fluid 4 in the inner bag 3 can be continuously pumped out.

In addition, as another example of a conventional pumping device using a follow plate, a pumping device (not shown) is published in a publication (for example, see Patent Document 1).
JP 2006-46156 A

  However, in the conventional pumping apparatus 1 shown in FIG. 9, the follow plate 6 is placed on the bottom surface 2 a of the container 2 when the fluid 4 in the inner bag 3 attached to the container 2 is pumped. When approaching, the bottom of the inner bag 3 is lifted by the self-priming force of the pump device 5. When the lifted inner bag 3 covers the fluid suction port 5a of the pump device 5 closer to this, the suction action of the fluid 4 by the pump device 5 is reduced, and the predetermined amount is reduced. In some cases, the fluid 4 cannot be pumped at a stable flow rate. When the fluid suction port 5 a is closed by the inner bag 3, cavitation may occur in the pump device 5.

  In order to prevent such a problem from occurring, as shown in FIG. 9, the pumping operation should be stopped before the fluid suction port 5 a of the pump device 5 is covered by the inner bag 3. However, in this case, a large amount of the fluid 4 that cannot be pumped out remains in the inner bag 3 and the efficiency of the pumping operation is deteriorated.

  As shown in FIG. 9, when the follow plate 6 approaches the bottom surface 2 a of the container 2, the inner bag 3 is lifted by the self-suction force of the pump device 5. As the body 4 continues to be sucked, the pressure in the inner bag 3 decreases, and this causes the fluid 9 such as air that exists in the fluid space 8a between the inner surface of the container 2 and the outer surface of the inner bag 3 to expand. is there.

  Further, as shown in FIG. 10, in this conventional pumping device 1, when the fluid 4 in the inner bag 3 attached to the container 2 is pumped and the follow plate 6 is lowered, By the outer peripheral part 6a of the follow plate 6, the fluid 9 existing between the inner surface of the side wall 2b of the container 2 and the outer surface of the inner bag 3 is gathered downward, and the side wall of the inner bag 3 rises inward. It may become a state. Thus, when the fluid space 8b is formed inside the side wall 2b of the container 2, even if the pump device 5 operates, the follow plate 6 cannot be lowered due to the fluid space 8b. The fluid 4 in the inner bag 3 may not be pumped out.

  The present invention has been made to solve the above-described problems, and is capable of pumping out the fluid contained in the inner bag attached to the container almost completely at a predetermined stable flow rate. It is an object of the present invention to provide an inner bag suction prevention device and a pumping device that can be used and can increase the efficiency of the pumping operation.

In the inner bag suction preventing device according to the first invention , an inner bag is mounted in a container, a follow plate is disposed in the inner bag, and the follow plate increases or decreases the volume of the inner bag. An inner bag suction preventing device that is movable relative to the bag and that is used in a pumping device that pumps out a fluid contained between the inner bag and the follow plate. A fluid discharge part attached to the container for discharging the fluid existing in a fluid space between the inner surface of the container and the outer surface of the inner bag to the outside and depressurizing the fluid , the fluid discharge part Does not discharge the fluid from the time when the pump starts sucking the fluid until the predetermined operation start time before the fluid suction port of the pump is closed by the inner bag, and starts the operation. From time to time It is characterized in that to start the discharge of the fluid.

The pumping device in which the inner bag suction preventing device according to the present invention is used can pump out a fluid such as a caulking agent accommodated in the inner bag mounted on the container by a pump. Then, when the pump pumps out the fluid and the fluid in the inner bag decreases, the follow plate moves relative to the inner bag in the direction of decreasing the volume of the inner bag. At the same time, the pressure in the inner bag is lowered, and thereby, a fluid such as air existing in the fluid space between the inner surface of the container and the outer surface of the inner bag tends to expand. At this time, the fluid discharge part of the inner bag suction preventing device can discharge the fluid existing in the fluid space to the outside of the container and depressurize the fluid space, so that the expansion of the fluid can be suppressed. It is possible to prevent the fluid suction port of the pump from being covered or blocked close to a predetermined amount or more.

Further, even when a fluid exists between the inner surface of the side wall of the container and the outer surface of the inner bag and a fluid space is formed in the fluid, the fluid is discharged by the fluid discharge portion, thereby It is possible to prevent the inner bag from rising up. Accordingly, the follow plate can move relative to the inner bag in a direction to reduce the volume of the inner bag without being obstructed by the fluid space.
Furthermore, since the fluid discharge part does not discharge the fluid from the time when the pump starts to suck the fluid until the predetermined operation start time before the fluid suction port of the pump is closed by the inner bag, In the time up to the start time, the operating energy of the fluid discharge part can be reduced. And during this time, since the fluid suction port is not closed by the inner bag, the fluid can be pumped out at a predetermined flow rate by the pump.
And since the fluid discharge part can start discharge | emission of the fluid from the predetermined | prescribed operation start time, and can reduce pressure of the fluid space, the rise of an inner bag can be made small. This prevents the inner bag from closing the fluid inlet of the pump and prevents the movement of the follow plate from being blocked by the rise of the inner bag, so that the pump pumps the fluid at a predetermined flow rate. Can be maintained. In this way, the fluid in the inner bag can be pumped out almost completely.

In the inner bag suction preventing device according to the second invention, an inner bag is mounted in a container, a follow plate is disposed in the inner bag, and the follow plate increases or decreases the volume of the inner bag. An inner bag suction preventing device that is movable relative to the bag and that is used in a pumping device that pumps out a fluid contained between the inner bag and the follow plate. A fluid discharge part attached to the container for discharging the fluid existing in the fluid space between the inner surface of the container and the outer surface of the inner bag to decompress the container, and a bottom surface of the container. It is formed in the whole or a part, and is provided with the funnel-shaped recessed part provided in the downward position of the suction inlet of the said pump with which the said follow plate is mounted | worn.
According to the inner bag suction preventing device according to the second invention, for example, even when the fluid has a relatively high viscosity or the pumping flow rate by the pump is relatively large, the fluid contained in the inner bag. When the bag is sucked in and pumped out, the bottom portion of the inner bag can be in a substantially flat horizontal state. In other words, when the fluid has a relatively high viscosity, etc., when the fluid in the inner bag is sucked out by the pump, the pressure in the portion of the fluid in the inner bag close to the suction port of the pump Therefore, even if the fluid discharge part is operated, the part of the bottom of the inner bag located below the pump suction port is closer to the suction port than the surrounding part. May be lifted in the direction.
Therefore, the whole or part of the bottom surface of the container to which the inner bag is mounted is formed as a funnel-shaped recess, whereby when the inner bag is mounted on the container, the bottom of the inner bag is along the bottom surface of the container. It can be made to have a shape protruding downward. In this state, when the fluid contained in the inner bag is sucked in and pumped out, the bottom of the inner bag is lifted in a direction approaching the suction port, and eventually it becomes a substantially flat horizontal state. It is possible to prevent the bottom of the inner bag from blocking the suction port of the pump.
In the inner bag suction preventing device according to the present invention, the fluid discharge section may include a vacuum pump or an ejector .

In this way, by using a vacuum pump or an ejector as the fluid discharge part , the fluid existing in the fluid space between the inner surface of the container and the outer surface of the inner bag is surely discharged to the outside of the container to decompress the fluid space. can do. Thereby, it is possible to prevent the inner bag from being lifted by the self-suction force of the pump, and it is possible to prevent the inner bag from rising inside the side wall of the container.

In the inner bag suction preventing device according to the present invention, a valve may be provided in the middle of the fluid flow path that communicates the fluid suction port provided in the fluid discharge portion and the fluid space .

In this manner, the valve can be closed automatically or manually by operating the fluid discharge part to reduce the fluid space between the inner surface of the container and the outer surface of the inner bag. The decompressed state of the fluid space can be maintained. Therefore, in order to maintain the decompressed state of the fluid space, the time for operating the fluid discharge portion can be shortened, and the energy for operating the fluid discharge portion can be reduced.

In the inner bag suction preventing device according to the present invention, a fluid discharge port provided in the container for discharging the fluid existing in the fluid space to the outside of the container, and inside the container so as to cover the fluid discharge port. It is good to further provide a closing prevention part provided and preventing the fluid outlet from being closed by the inner bag .

By doing so, the fluid discharge part operates to discharge the fluid in the fluid space from the fluid discharge port to the outside of the container, thereby reducing the volume of the fluid space and moving the inner bag in a direction covering the fluid discharge port. However, the fluid discharge port can be prevented from being closed by the inner bag by the closing prevention portion. Thereby, the inside of the fluid space can be sufficiently depressurized.

In the inner bag suction preventing device according to the present invention, the fluid discharge port is provided at substantially the center of the bottom surface of the container, and the closing prevention portion is a cocoon-like body or an open cell body, and substantially the entire bottom surface of the container. it may be assumed to be a size over to go to.

In this way, by providing the fluid discharge port substantially at the center of the bottom surface of the container, it is easy to discharge the fluid in the fluid space from the fluid discharge port to the outside of the container over the entire bottom surface and side surface of the container. Can do. Further, the closure preventing portion is a spider or open cell body, and the closure preventing portion is formed to have a size that extends over substantially the entire bottom surface of the container. Thus, the fluid space can be hardly formed. Thus, the bulge of the inner bag can be prevented over substantially the entire surface of the closure preventing portion and the side surface of the container, so that the fluid in the inner bag can be almost completely pumped out.

In the inner bag suction preventing device according to the present invention, the lowermost portion of the funnel-shaped recess may be formed at a position below the suction port of the pump .

In this way, the lowermost part of the funnel-shaped recess is formed at a position below the suction port of the pump, because the part of the bottom of the inner bag located below the suction port of the pump is Because it is easier to lift in the direction closer to the suction port than the surrounding parts, the portion located below the pump suction port in the bottom of the inner bag is arranged away from the suction port than the other parts. Because. By doing so, when the fluid contained in the inner bag is sucked in and pumped out, the bottom portion of the inner bag can be brought into a substantially flat horizontal state with high accuracy. It is possible to prevent the bottom portion from blocking the suction port.

In the pumping device according to the present invention , an inner bag is mounted in a container, a follow plate is disposed in the inner bag, and the follow plate increases or decreases the volume of the inner bag with respect to the inner bag. A pumping device that is relatively movable and sucks and pumps a fluid contained between the inner bag and the follower plate, comprising the inner bag suction preventing device according to the present invention. It is a feature.

According to the pumping device according to the present invention , as described above, the operation of the inner bag suction preventing device can be achieved, so that almost all of the fluid contained in the inner bag is pumped at a predetermined stable flow rate. Can be put out.

According to the inner bag suction preventing device according to the first aspect of the invention and the pumping device according to the eighth aspect of the invention , the fluid present in the fluid space between the inner surface of the container and the outer surface of the inner bag Since the fluid space can be decompressed and discharged from the container, the inner bag is lifted by the pump's self-suction force when the pump sucks and pumps the fluid in the inner bag, It is possible to prevent the inner bag from approaching the fluid suction port more than a predetermined amount and covering the fluid suction port.

  Further, even when a fluid exists between the inner surface of the side wall of the container and the outer surface of the inner bag and a fluid space is formed there, the fluid space is reduced by discharging the fluid by the fluid discharge portion. Can be extinguished. As a result, for the pumping device using the follow plate, the follow plate moves relative to the inner bag in a direction that reduces the volume of the inner bag without being obstructed by the fluid space. Can do.

  Therefore, substantially all of the fluid contained in the inner bag attached to the container can be pumped at a predetermined stable flow rate, and as a result, the efficiency of the pumping operation can be increased. Furthermore, since the fluid suction port is not closed by the inner bag, cavitation can be prevented from occurring in the pump.

  Hereinafter, a first embodiment of an inner bag suction preventing device and a pumping device according to the present invention will be described with reference to FIG. As shown in FIG. 1, the pumping device 11 includes a pump device 5 and an inner bag suction preventing device 12. For example, the pumping device 11 pumps up a fluid 4 stored in a container 2 such as a drum can or a pail can. The fluid can be discharged from the fluid outlet 5b at a predetermined flow rate.

  The pumping device 11 can be applied to a coating device or a filling device (not shown). The coating device flows out from the fluid outlet 5b of the pumping device 11 at a predetermined flow rate. The fluid 4 can be supplied to a discharger (not shown) via a transfer pipe, and the fluid 4 can be discharged from the discharger at a specified flow rate and applied to various members.

  The fluid 4 shown in FIG. 1 is, for example, a high-viscosity liquid such as a paste or cream caulking agent, a sealant, a vibration damping agent, or an ointment, or a low-viscosity liquid having a viscosity close to water. The container 2 has, for example, a short cylindrical shape that opens upward and has a bottom 2c.

  FIG. 1 is a longitudinal sectional view of a pumping device 11, and the pumping device 11 is used to pump out a fluid 4 in an inner bag (for example, a plastic bag) 3 attached to a container 2. This shows a state in which the follow plate 6 is approaching the bottom surface 2 a of the container 2.

  As shown in FIG. 1, the pumping device 11 includes a pump device 5 including a pump 13, an elevating mechanism (not shown) for moving the pump device 5 up and down, and an inner bag suction preventing device 12. ing.

  The pump device 5 can suck in the fluid 4 accommodated in the inner bag 3 attached to the container 2 from the fluid suction port 5a of the pump 13, and can flow out at a predetermined flow rate from the fluid outlet 5b. Is. A transfer pipe (not shown) is connected to the fluid outlet 5b.

  The pump 13 has a suction port 5c at the lower end thereof detachably attached to the central opening 6b of the follow plate 6, and the follow plate 6 is attached substantially horizontally. Pump casings 14 and 15 are attached to the upper end portion of the pump 13, and a speed reducer 17 and an electric motor are attached to the upper end portions of the pump casings 14 and 15 via brackets 16.

  As shown in FIG. 1, the pump 13 is a vertical uniaxial eccentric screw pump, and includes a rotor 18 and a stator 19. The rotor 18 has a male screw shape, and is rotatably mounted on a stator 19 having a female screw-shaped inner hole 19a. And the upper end of this rotor 18 is connected with the rotating shaft 17a of the speed reducer 17 via the connecting rod 20. The upper and lower ends of the connecting rod 20 are connected to the rotary shaft 17a of the speed reducer 17 and the rotor 18 via universal joints 21 and 21, respectively.

  Although not shown in the drawing, the elevating mechanism is for elevating the pump device 5, and the pump 13 is operated to pump up the fluid 4 accommodated in the inner bag 3 attached to the container 2. The pump device 5 can automatically follow the surface of the fluid 4 and be lowered by the suction force (self-suction force) of the pump 13 when the pump 13 is in operation.

  The follow plate 6 is, for example, a substantially disk-shaped body, and is made of a synthetic resin such as urethane foam having flexibility of a closed cell body. As shown in FIG. 1, the outer periphery 6 a of the follow plate 6 is in contact with the inner surface of the substantially short cylindrical side wall 2 b of the container 2 through the inner bag 3. A contact portion with the inner surface of the inner bag 3 is sealed.

  The reason why the fluid 4 is housed in the inner bag 3 is to prevent the fluid 4 from contacting and solidifying (curing) with moisture in the air. The upper opening end of the inner bag 3 is fastened to the upper edge of the container 2 with a band 7 so that the inner bag 3 does not slide down.

  Next, the inner bag suction preventing device 12 will be described with reference to FIG. The inner bag suction preventing device 12 is attached to the container 2 and discharges the fluid 9 such as air existing in the fluid spaces 8 a and 8 b between the inner surface of the container 2 and the outer surface of the inner bag 3 to the outside of the container 2. The fluid spaces 8a and 8b are for decompressing or extinguishing the fluid spaces 8a and 8b, and are provided with a fluid discharge portion 22. However, FIG. 1 shows a state in which the fluid space 8b formed on the inner surface of the side wall 2b of the container 2 has disappeared.

  The fluid discharge unit 22 is, for example, a vacuum pump, but an ejector can be used instead of the vacuum pump. The ejector can generate a suction force using, for example, pressurized air. Further, as shown in FIG. 1, the fluid suction port 22 a provided in the fluid discharge unit 22 is connected to the fluid discharge port 24 formed in the bottom 2 c of the container 2 through the fluid discharge pipe 23. The fluid discharge port 24 is formed substantially at the center of the circular bottom 2c of the container 2. A check valve 25, for example, is attached in the middle of the fluid discharge pipe 23. Further, the fluid 9 such as air in the fluid spaces 8 a and 8 b sucked by the fluid discharge unit 22 is discharged from the fluid outlet 26 provided in the fluid discharge unit 22 to the atmosphere.

  Next, as shown in FIG. 1, a procedure for pumping out the fluid 4 contained in the inner bag 3 mounted in the container 2 using the pumping device 11 including the inner bag suction preventing device 12, And its operation will be described. For example, first, as shown by a one-dot chain line in FIG. 1, the follower plate 6 is inserted into the inner bag 3 attached to the container 2, and the lower surface of the follower plate 6 is accommodated in the inner bag 3. Touch the surface. In this state, the fluid suction port 5 c of the pump device 5 is attached to the central opening 6 b of the follow plate 6. After that, the pump device 5 and the fluid discharge part 22 are operated.

  As a result, the fluid 4 can be sucked from the fluid suction port 5a of the pump device 5 and allowed to flow out from the fluid outlet 5b. Then, when the fluid 4 in the inner bag 3 is pumped out and the fluid 4 in the inner bag 3 decreases in this way, as shown in FIG. Since the pump device 5 attached thereto is automatically lowered by its own weight, the fluid 4 in the inner bag 3 can be continuously pumped at a predetermined stable flow rate.

  Further, when the pump device 5 pumps out the fluid 4 and the fluid 4 in the inner bag 3 decreases, the follower plate 6 moves in a downward direction to decrease the volume of the inner bag 3, and accordingly, The pressure in the inner bag 3 is lowered, and as a result, the fluid 9 such as air existing in the fluid spaces 8 a and 8 b between the inner surface of the container 2 and the outer surface of the inner bag 3 tends to expand. On the other hand, since the fluid discharge unit 22 is activated, the fluid 9 existing in the fluid space 8a is discharged out of the container 2 to depressurize the fluid space 8a. Expansion can be suppressed and the bottom of the inner bag 3 can be prevented from lifting toward the fluid suction port 5a of the pump 13.

  That is, since the fluid 9 existing in the fluid space 8a between the inner surface of the container 2 and the outer surface of the inner bag 3 can be discharged out of the container 2 by the fluid discharge portion 22, the pressure of the fluid space 8a can be reduced. The bottom of the inner bag 3 can be prevented from being lifted by the self-suction force of the pump 13 when the pump device 5 sucks and pumps the fluid 4 in the inner bag 3. Therefore, it is possible to prevent the inner bag 3 from being lifted by the self-suction force of the pump 13 and the inner bag 3 from approaching the fluid suction port 5a more than a predetermined amount and covering the fluid suction port 5a.

  Even when the fluid 9 exists between the inner surface of the side wall 2b of the container 2 and the outer surface of the inner bag 3, and the fluid space 8b (see FIG. 10) is about to be formed there, the fluid 9 is used as the fluid. By discharging with the discharge part 22, the fluid space 8b in the inner surface of the side wall 2b of the container 2 can be eliminated. Thereby, the follow plate 6 can move relative to the inner bag 3 in the direction of decreasing the volume of the inner bag 3 without being obstructed by the fluid space 8b.

  As a result, substantially all of the fluid 4 accommodated in the inner bag 3 attached to the container 2 can be pumped, and as a result, the efficiency of the pumping operation can be increased. Then, the fluid 4 can be pumped out at a predetermined stable flow rate. Further, since the fluid suction port 5a is not closed by the inner bag 3, it is possible to prevent cavitation from occurring in the pump 13.

  Further, according to the inner bag suction preventing device 12 shown in FIG. 1, by using a vacuum pump or an ejector as the fluid discharge portion 22, the fluid spaces 8 a and 8 b between the inner surface of the container 2 and the outer surface of the inner bag 3 are formed. The existing fluid 9 can be reliably discharged out of the container 2 to depressurize the fluid spaces 8a and 8b. Thereby, it is possible to prevent the bottom portion of the inner bag 3 from being lifted by the self-suction force of the pump 13, and it is possible to prevent the inner bag 3 from being raised inside the side wall 2 b of the container 2.

  Further, as shown in FIG. 1, since the check valve 25 is provided in the middle of the fluid discharge pipe 23, the fluid spaces 8a and 8b between the inner surface of the container 2 and the outer surface of the inner bag 3 are decompressed. And when the pressure is reduced to a predetermined pressure, the reduced pressure state can be reliably maintained. Since the fluid discharge portion 22 is automatically stopped when the fluid spaces 8a and 8b are depressurized to a predetermined pressure, the depressurized state (low pressure state) of the fluid spaces 8a and 8b is maintained. The time for operating the fluid discharge part 22 can be shortened, and the energy for operating the fluid discharge part 22 can be reduced.

  Then, as shown in FIG. 1, by providing the fluid discharge port 24 at substantially the center of the bottom 2c of the container 2, the fluid spaces 8a and 8b extend over substantially the entire bottom surface 2a of the container 2 and the inner surface of the side wall 2b. The fluid 9 can be easily discharged from the fluid outlet 24 to the outside of the container 2. This prevents the inner bag 3 from rising over substantially the entire bottom surface 2a of the container 2 and the inner surface of the side wall 2b, so that the fluid 4 in the inner bag 3 can be pumped out almost completely at a predetermined stable flow rate. Can be.

  Moreover, in this pumping-out apparatus 11, since the suction type single axis | shaft eccentric screw pump is used as the pump 13, as shown in FIG. 1, it is accommodated in the inner bag 3 without applying a pressure to the container 2. As shown in FIG. It is convenient that the fluid 4 can be pumped out. However, as described above, since the pressure in the inner bag 3 is reduced during the drawing operation, the inner bag 3 may be lifted and the fluid suction port 5a of the pump device 5 may be blocked. By using the suction preventing device 12, the inner bag 3 can be prevented from being lifted. Therefore, even if a suction-type uniaxial eccentric screw pump is used, the fluid 4 in the inner bag 3 can be pumped out almost completely at a predetermined stable flow rate.

  Next, 2nd Embodiment of the drawing-out apparatus provided with the inner bag suction prevention apparatus which concerns on this invention is described with reference to FIG. The pumping device 28 of the second embodiment shown in FIG. 2 is provided with a closing prevention portion 29 between the bottom surface 2a of the container 2 and the inner bag 3 of the pumping device 11 of the first embodiment shown in FIG. Is. Other than this, the configuration is the same as that of the pumping device 11 of the first embodiment shown in FIG. 1, and the same effect is exhibited. Therefore, the same parts are denoted by the same reference numerals and the description thereof is omitted.

  As shown in FIG. 2, the closing prevention portion 29 is for preventing the fluid discharge port 24 formed on the bottom surface 2 a of the container 2 from being closed by the inner bag 3, and the bottom surface 2 a of the container 2. Is placed. The closing prevention portion 29 is formed of, for example, a spider or open cell body, and is configured such that the fluid 9 can freely pass through the closing prevention portion 29. The closing prevention portion 29 is formed in a substantially disk shape having a size and shape that extends over substantially the entire bottom surface 2 a of the container 2.

  According to the inner bag suction preventing device 30 provided with the closing prevention portion 29, the fluid discharge portion 22 is operated to discharge the fluid 9 in the fluid spaces 8a and 8b from the fluid discharge port 24 to the outside of the container 2. When the volume of the fluid space 8a decreases, the inner bag 3 moves downward to cover the fluid discharge port 24. However, the fluid discharge port 24 is formed by the closing prevention portion 29 formed of a spider or open cell body. Can be prevented from being closed by the inner bag 3. As a result, the fluid space 8a can be reliably depressurized so as to have a predetermined set pressure.

  Then, as shown in FIG. 2, the closure preventing portion 29 is formed in a size that extends over substantially the entire bottom surface 2 a of the container 2, so that it covers substantially the entire bottom surface 2 a of the container 2 and the inner surface of the side wall 2 b. The fluid spaces 8a and 8b can be hardly formed. This prevents the inner bag 3 from rising over substantially the entire upper surface of the closing prevention portion 29 and the inner surface of the side wall 2b, so that the fluid 4 in the inner bag 3 is almost completely pumped at a predetermined stable flow rate. You can make it out.

  Next, a third embodiment of the pumping device provided with the inner bag suction preventing device according to the present invention will be described with reference to FIG. The pumping device 32 of the third embodiment shown in FIG. 3 is different from the pumping device 28 of the second embodiment shown in FIG. 2 in the pumping device 28 of the second embodiment shown in FIG. In the pumping device 32 of the third embodiment shown in FIG. 3, the closing prevention portion 29 is a substantially disk-like body having a size and shape that extends over substantially the entire bottom surface 2 a of the container 2. The closing prevention portion 33 is a substantially disk-like body having a diameter of about ½ of the bottom surface 2 a of the container 2.

  As shown in FIG. 3, the closing prevention portion 33 is mounted in a circular recess 34 formed at the center of the bottom portion 2 c of the container 2, and the upper surface 33 a of the closing prevention portion 33 and the bottom surface 2 a of the container 2 are It is comprised so that it may be located in the same plane. Other than this, the configuration is the same as that of the pumping device 28 of the second embodiment shown in FIG. 2, and the same operation is achieved. Therefore, the same parts are denoted by the same reference numerals and the description thereof is omitted.

  According to the inner bag suction preventing device 35 provided with the closure preventing portion 33, as shown in FIG. 3, the closure preventing portion 33 is a substantially disk-like body having a diameter of about ½ of the bottom surface 2a of the container 2. By arranging in the center of the bottom surface 2a of the container 2, the fluid space 8a can be hardly formed in the substantially central portion of the bottom surface 2a of the container 2. That is, since the inner bag 3 is likely to swell at the center portion of the bottom surface 2a of the container 2, the swell of the inner bag 3 at the center portion can be suppressed by reducing the pressure of the fluid space 8a.

  And as shown in FIG. 3, since it comprised so that the upper surface 33a of the closure prevention part 33 and the bottom face 2a of the container 2 might be located in the same plane, when the follow plate 6 moves to a descending position, a closure prevention It is possible to prevent a gap from being formed between the upper surface 33 a of the portion 33 and the bottom surface 2 a of the container 2 and the lower surface of the follow plate 6. Therefore, the fluid 4 in the inner bag 3 can be pumped out almost completely at a predetermined stable flow rate.

  Next, 4th Embodiment of the drawing-out apparatus provided with the inner bag suction prevention apparatus which concerns on this invention is described with reference to FIGS. The pumping device 37 of the fourth embodiment shown in FIG. 4 is different from the pumping device 11 of the first embodiment shown in FIG. 1 in the pumping device 11 of the first embodiment shown in FIG. Whereas the bottom surface 2a of the container 2 is a circular flat surface, in the pumping device 37 of the fourth embodiment shown in FIG. 4, a funnel-shaped recess 38 is formed on the entire bottom surface 2a of the container 2. is there. As described above, the funnel-shaped recess 38 is formed on the bottom surface 2a of the container 2 because, for example, when the fluid 4 has a relatively high viscosity or the pumping flow rate by the pump 13 is relatively large, the inner bag 3 The portion 39 located below the suction port 5a of the pump 13 may be lifted in the direction closer to the suction port 5a than the surrounding portion, but in this way, the bottom portion of the inner bag 3 is This is because the bottom portion of the inner bag 3 is in a substantially flat horizontal state in the lifted state.

  In this way, as shown in FIG. 4, the bottom surface 2a of the container 2 is formed with a funnel-shaped, for example, substantially inverted conical concave portion 38 as a whole, and is the center of the concave portion 38 (bottom surface 2a). A fluid discharge port 24 is formed in the lower portion 40. And the lowermost part 40 of the center of this recessed part 38 is formed in the downward position of the suction inlet 5a of the pump 13. As shown in FIG.

  The container 2 is, for example, a drum can or a pail can similar to that of the first embodiment, and has a short cylindrical shape that opens upward and has a bottom 2c. For example, the inner diameter of the container 2 is 200 to 600 mm, and the height is 300 to 900 mm. The height difference H between the lowermost portion 40 at the center of the concave portion 38 and the uppermost portion 41 of the outer peripheral portion is, for example, about 10 mm. This height difference H can be determined according to the properties such as the viscosity of the fluid 4 pumped out by the pump 13, the dimensions of the container 2, the position where the fluid discharge port 24 is formed, and the like.

  In short, when the fluid 4 in the inner bag 3 is pumped out by the pump 13, the height difference H and the shape of the recess 38 are set in advance so that the bottom of the inner bag 3 is in a substantially flat horizontal state. Find it by experiment. Other than this, the configuration is the same as that of the pumping device 11 of the first embodiment shown in FIG. 1, and the same effect is achieved. Therefore, the same parts are denoted by the same reference numerals and the description thereof is omitted.

  4 to 6 show a procedure for pumping out the fluid 4 contained in the inner bag 3 mounted in the container 2 using the pumping device 37 having the inner bag suction preventing device 42. 4, the follow plate 6 is brought into contact with the surface of the fluid 4 accommodated in the inner bag 3, and the fluid suction port 5 c of the pump device 5 is attached to the central opening 6 b of the follow plate 6. Indicates the state.

  At this time, the bottom of the inner bag 3 is in contact with the entire bottom surface 2a of the container 2 (in FIG. 4, the bottom of the inner bag 3 and the bottom surface 2a of the container 2 are easy to understand. Therefore, the bottom portion of the inner bag 3 has substantially the same shape as the bottom surface 2a of the container 2, that is, a substantially inverted cone protruding downward. It is in shape.

  FIG. 5 shows a state in which the pump device 5 and the fluid discharge unit 22 are operated, and the fluid 4 is sucked from the fluid suction port 5a of the pump device 5 and flows out from the fluid outlet 5b. In the state shown in FIG. 5, a large amount of fluid 4 is accommodated in the inner bag 3, and the interval between the suction port 5 a of the pump 13 and the bottom of the inner bag 3 is relatively large. The bottom portion remains in contact with the bottom surface 2 a of the container 2.

  FIG. 6 shows a state in which the pump device 5 and the fluid discharge unit 22 are operated, and the fluid 4 accommodated in the inner bag 3 is reduced, and the suction port 5a of the pump 13 and the bottom of the inner bag 3 are reduced. The interval is relatively small. In the state shown in FIG. 6, the bottom portion of the inner bag 3 is in a substantially flat horizontal state without closing the suction port 5 a of the pump 13. As a result, the fluid 4 in the inner bag 3 can be almost completely pumped out at a predetermined stable flow rate.

  Next, the operation of the inner bag suction preventing device 42 will be described. According to the inner bag suction preventing device 42, as shown in FIG. 6, even if the fluid 4 has a relatively high viscosity or the pumping flow rate by the pump 13 is relatively large, it is accommodated in the inner bag 3. When the fluid 4 is sucked and pumped out by the pump 13, the bottom portion of the inner bag 3 can be made to be in a substantially flat horizontal state. That is, when the fluid 4 has a relatively high viscosity or the like, when the fluid 4 in the inner bag 3 is sucked and pumped out by the pump 13, of the fluid 4 in the inner bag 3, Since the pressure in the portion close to the suction port 5a is lower than the surrounding portion, the portion located below the suction port 5a of the pump 13 in the bottom portion of the inner bag 3 even when the fluid discharge portion 22 is operated. 39 may be lifted in a direction closer to the suction port 5a than the surrounding portion.

  Therefore, the entire bottom surface 2 a of the container 2 to which the inner bag 3 is mounted is formed as a funnel-shaped recess 38, so that when the inner bag 3 is mounted on the container 2, the bottom of the inner bag 3 is the container 2. By extending along the bottom surface 2a, the shape can be projected downward. In this state, when the fluid 4 accommodated in the inner bag 3 is sucked and pumped out by the pump 13, the bottom of the inner bag 3 is lifted in a direction approaching the suction port 5a, and eventually becomes a substantially flat horizontal state. Thus, the bottom of the inner bag 3 can be prevented from blocking the suction port 5 a of the pump 13.

  Further, the lowermost portion 40 of the funnel-shaped recess 38 is formed at a position below the suction port 5 a of the pump 13, because the bottom portion of the inner bag 3 is below the suction port 5 a of the pump 13. Since the portion 39 positioned may be lifted in a direction closer to the suction port 5a than the surrounding portion, the portion 39 located below the suction port 5a of the pump 13 in the bottom of the inner bag 3 This is because it is arranged away from the suction port 5a rather than the portion. By doing in this way, when the fluid 4 accommodated in the inner bag 3 is sucked in and pumped out by the pump 13, the bottom portion of the inner bag 3 can be brought into a substantially flat horizontal state with high accuracy. The bottom of the inner bag 3 can be prevented from blocking the suction port 5a.

  However, in the pumping apparatuses 11, 28, 32, and 37 according to the first to fourth embodiments, the fluid discharge section is operated at the same time or substantially at the same time as the pump apparatus 5 is operated to suck the fluid 4 in the inner bag 3. 22 is operated to discharge the fluid 9 in the fluid spaces 8a and 8b and reduce the pressure. Instead, the flow of the pump device 5 starts when the pump device 5 starts to suck the fluid 4. Until the body suction port 5a is closed by the inner bag 3, the fluid discharge section 22 does not discharge the fluid 9 until a predetermined operation start time (time shown in FIG. 7), and the operation shown in FIG. From the start time, the fluid discharge part 22 can start discharging the fluid 9.

  7 shows that the pressure in the inner bag 3 is reduced because the fluid 4 in the inner bag 3 is sucked by operating the pump device 5 with the fluid discharge portion 22 stopped. The state where the fluid 9 in the fluid space 8a between the outer surface of the bag 3 and the bottom surface 2a of the container 2 is inflated is shown.

  In this way, when the pump device 5 starts to suck the fluid 4, the fluid suction port 5a of the pump device 5 starts to act as shown in FIG. Since the fluid 9 is not discharged by the fluid discharge unit 22 until the time point, the operation energy of the fluid discharge unit 22 can be reduced in the time until the start of the operation. During this time, the inner bag 3 approaches the fluid suction port 5a more than a predetermined amount and does not cover or close the fluid suction port 5a. Therefore, the pump device 5 pumps the fluid 4 at a predetermined flow rate. Can be put out.

  And since the fluid discharge part 22 can start discharge | emission of the fluid 9 from the predetermined | prescribed operation start time shown in FIG. 7, and can depressurize the fluid space 8a, reducing the rise | swell of the inner bag 3 shown to the figure Can do. This prevents the inner bag 3 from covering or closing the fluid suction port 5a of the pump device 5 more than a predetermined distance, and keeps the pump device 5 pumping the fluid 4 at a predetermined flow rate. Can be made. In this way, the fluid 4 in the inner bag 3 can be pumped out almost completely at a predetermined stable flow rate.

  Although not shown in the drawing, the start / stop switch for starting and stopping the fluid discharge unit 22 can be provided, for example, in an elevating mechanism for elevating the pump device 5. This start / stop switch stops the fluid discharge unit 22 from the time when the pump device 5 starts sucking the fluid 4 in the inner bag 3 until the predetermined operation start time shown in FIG. 9 is set not to be discharged. The start / stop switch is set to automatically start the fluid discharge portion 22 from the operation start time shown in FIG. 7 and discharge the fluid 9 such as air from the fluid space 8a. The fluid discharge unit 22 activated in this way is set to automatically stop when the pressure in the fluid space 8a is reduced to a predetermined set pressure.

  Further, in the embodiment shown in FIG. 7, when the fluid 9 exists between the inner surface of the side wall 2b of the container 2 and the outer surface of the inner bag 3, and a fluid space 8b (not shown) is formed there. The fluid discharge portion 22 may be automatically activated when the fluid space 8b reaches the earlier of the predetermined operation start time shown in FIG. Good.

  And in the said 1st-4th embodiment, as shown in FIG. 1 etc., although the check valve 25 was provided in the fluid discharge pipe 23, it may replace with this and may provide a normal on-off valve. The on-off valve is set to automatically close when the pressure in the fluid spaces 8a and 8b reaches a predetermined set pressure.

  Further, in the second embodiment, as shown in FIG. 2, the fluid discharge port 24 is provided at the center of the bottom 2c of the container 2, but instead, as shown by the alternate long and short dash line in FIG. 24 may be provided on a portion of the side wall 2b of the container 2 that faces the outer peripheral portion of the closing prevention portion 29.

  Furthermore, although the follow plate 6 of the first to fourth embodiments is formed of closed cells such as foamed synthetic resin, for example, instead of this, it may be formed of, for example, flexible synthetic resin that does not include closed cells. Good.

  And in the said 1st-4th embodiment, as shown in FIG. 1 etc., although the uniaxial eccentric screw pump was used as a pump, you may use other suction pumps.

  Moreover, in the said 1st-4th embodiment, as shown in FIG. 1 etc., when the fluid 4 in the inner bag 3 is pumped out and the fluid 4 in the inner bag 3 decreases, to this, Accordingly, the follow plate 6 and the pump device 5 attached to the follow plate 6 are automatically lowered by their own weight. Instead, the follow plate 6 and the pump device 5 to which the follow plate 6 is attached are mounted on a stand or the like. The container 2 to which the inner bag 3 is attached may be automatically raised as the fluid 4 in the inner bag 3 decreases.

  Further, in the fourth embodiment, as shown in FIG. 4, the funnel-shaped recess 38 is formed over the entire bottom surface 2 a of the container 2, but instead of this, the container 2 is not shown in the figure. A funnel-shaped recess having a predetermined size may be formed in the center of the bottom surface 2a where the fluid discharge port 24 is provided. The height difference H between the lowermost portion at the center of the concave portion and the uppermost portion of the outer peripheral portion is, for example, about 10 mm. And this recessed part is a substantially reverse cone shape, for example, and the radius is about 1/2 of the radius of the bottom face 2a of the container 2. FIG.

The pumping device 44 shown in FIG. 8 has the suction port portion 5c of the pump device 5 spaced apart from the bottom portion of the inner bag 3 (bottom portion 2c of the container 2) with the central axis of the pump 13 oriented in the vertical direction. It is arranged. A plurality of height bolts 45,... Protrude from the suction port portion 5c so that the suction port portion 5c can be spaced from the bottom portion of the inner bag 3 (bottom portion 2c of the container 2). The tip part (lower end part) of this height bolt 45 is in contact with the bottom part of the inner bag 3 (bottom part 2c of the container 2). In FIG. 8, a gap (fluid space 8a) is formed between the inner bag 3 and the bottom 2c of the container 2 so that the inner bag 3 and the bottom 2c of the container 2 can be clearly seen. In this state, the pumping device 5 can be used to pump out the fluid 4. Further, the suction port 5 a of the pump device 5 is positioned and arranged so as to face the fluid discharge port 24 formed in the bottom 2 c of the container 2. Except this, it is the same as that of each said embodiment, an equivalent part is shown with the same drawing code | symbol, and those description is abbreviate | omitted.

  The pumping device 44 shown in FIG. 8 can pump out the fluid 4 such as a caulking agent accommodated in the inner bag 3 attached to the container 2 by the pump 13. However, since the fluid suction port 5a of the pump 13 is close to the bottom of the inner bag 3, the suction force of the pump 13 works as a force to suck and lift the bottom of the inner bag 3, so that the container 2 The fluid 9 such as air existing in the fluid space 8 a between the inner surface and the outer surface of the inner bag 3 tends to expand. At this time, the fluid discharge part 22 of the inner bag suction preventing device 12 can discharge the fluid 9 existing in the fluid space 8a to the outside of the container 2 to depressurize the fluid space 8a, so that the expansion of the fluid 9 is suppressed. It is possible to prevent the bottom portion of the inner bag 3 from covering or closing the fluid suction port 5a of the pump 13 by approaching more than a predetermined amount. 8 indicates a state in which the bottom portion of the inner bag 3 is lifted by the suction force of the pump 13 when the inner bag suction preventing device 12 is not used.

  As described above, the inner bag suction preventing device and the pumping device according to the present invention pump the fluid contained in the inner bag attached to the container almost completely at a predetermined stable flow rate. It has an excellent effect of improving the efficiency of the pumping work, and is suitable for application to such an inner bag suction preventing device and the pumping device.

It is a longitudinal cross-sectional view which shows the drawing-out apparatus which concerns on 1st Embodiment of this invention. It is a longitudinal cross-sectional view which shows the drawing-out apparatus which concerns on 2nd Embodiment of the same invention. It is a longitudinal cross-sectional view which shows the drawing-out apparatus which concerns on 3rd Embodiment of the invention. It is a drawing-out apparatus which concerns on 4th Embodiment of the invention, and is a longitudinal cross-sectional view which shows the state before pumping out a fluid. It is a drawing apparatus which concerns on the 4th Embodiment, and is a longitudinal cross-sectional view which shows the state of the beginning of drawing out a fluid. It is a drawing apparatus which concerns on the 4th Embodiment, and is a longitudinal cross-sectional view which shows the state before the completion of drawing out of a fluid. It is a longitudinal cross-sectional view which shows the drawing-out apparatus which concerns on other embodiment of the same invention. It is a longitudinal cross-sectional view which shows the drawing-out apparatus which concerns on the reference technical example of the same invention. It is a longitudinal cross-sectional view which shows an example of the conventional drawing-out apparatus. It is a longitudinal cross-sectional view for demonstrating the conventional pumping apparatus shown in FIG.

2 Container 2a Bottom 2b Side wall 2c Bottom 3 Inner bag 4 Fluid 5 Pump device 5a Fluid suction port 5b Fluid outlet 5c Suction port 6 Follow plate 6a Outer periphery 6b Central opening 7 Bands 8a, 8b Fluid space 9 Fluid (air)
11, 28, 32, 37, 44 Pumping device 12, 30, 35, 42 Inner bag suction preventing device 13 Pump 14, 15 Pump casing 16 Bracket 17 Reducer 17a Rotating shaft 18 Rotor 19 Stator 19a Inner hole 20 Connecting rod 21 Universal Joint 22 Fluid Discharge Portion 22a Fluid Suction Port 23 Fluid Discharge Pipe 24 Fluid Discharge Port 25 Check Valve 26 Fluid Outflow Port 29, 33 Closure Prevention Portion 33a Closure Prevention Portion Top Surface 34, 38 Recess 39 Inner Bag Bottom Center Portion 40 The lowest part 41 of the recessed part formed in the container bottom part The uppermost part 45 of the recessed part formed in the container bottom part Height bolt 46 The dashed-two dotted line for description of the raising of an inner bag bottom part

Claims (8)

An inner bag is mounted in the container, a follow plate is disposed in the inner bag, and the follow plate is movable relative to the inner bag in a direction to increase or decrease the volume of the inner bag, An inner bag suction preventing device used for a pumping device that sucks and pumps a fluid contained between an inner bag and the follow plate,
A fluid discharge part attached to the container, for discharging the fluid existing in the fluid space between the inner surface of the container and the outer surface of the inner bag to decompress the container ,
The fluid discharge section does not discharge the fluid from when the pump starts to suck the fluid until a predetermined operation start time before the fluid suction port of the pump is closed by the inner bag. The inner bag suction preventing device starts discharging the fluid from the operation start time . An inner bag is mounted in the container, a follow plate is disposed in the inner bag, and the follow plate is movable relative to the inner bag in a direction to increase or decrease the volume of the inner bag, An inner bag suction preventing device used for a pumping device that sucks and pumps a fluid contained between an inner bag and the follow plate,
A fluid discharge unit attached to the container and configured to discharge the fluid existing in a fluid space between the inner surface of the container and the outer surface of the inner bag and decompress the fluid .
Is formed on the whole or part of the bottom surface of the container, the bag suction preventing device among which is characterized in Rukoto a funnel-shaped recess provided in the suction port of the lower position of the pump to be mounted on the follow plate . The inner bag suction preventing device according to claim 1 or 2 , wherein the fluid discharge section includes a vacuum pump or an ejector. 4. The valve according to claim 1 , wherein a valve is provided in the middle of the fluid flow path that communicates the fluid suction port provided in the fluid discharge portion and the fluid space. 5. Bag inhalation prevention device. A fluid outlet provided in the container for discharging the fluid existing in the fluid space to the outside of the container, and the fluid outlet provided inside the container so as to cover the fluid outlet is formed by the inner bag. The inner bag suction preventing device according to any one of claims 1 to 4 , further comprising a closing prevention portion for preventing the closing. The fluid outlet is provided at substantially the center of the bottom of the container;
6. The inner bag suction preventing device according to claim 5 , wherein the closing prevention portion is a bag-like body or an open cell body and has a size that extends over substantially the entire bottom surface of the container. The inner bag suction preventing device according to claim 2 , wherein a lowermost portion of the funnel-shaped recess is formed at a position below the suction port of the pump. An inner bag is mounted in the container, a follow plate is disposed in the inner bag, and the follow plate is movable relative to the inner bag in a direction to increase or decrease the volume of the inner bag, In a pumping device that sucks and pumps the fluid contained between the inner bag and the follow plate,
A pumping device comprising the inner bag suction preventing device according to any one of claims 1 to 7 .

Images