JP3148086B2 - Defoaming device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defoaming apparatus for removing air bubbles mixed in a liquid, and more particularly to an air bubble removing apparatus for removing air bubbles mixed in a high-viscosity liquid filled in a syringe. It relates to a defoaming device.

[0002]

2. Description of the Related Art Conventionally, a dispenser or a syringe is used to discharge a high-viscosity liquid such as an adhesive or a resin material in a fixed amount to form a dot-like or linear liquid reservoir. This syringe is formed, for example, by providing a small-diameter discharge port at one end of a hollow cylindrical body and slidably interposing a piston at the other open end, and has an amount corresponding to the amount of movement of the piston. Of liquid can be discharged. However, if air is mixed in the liquid, the liquid cannot be discharged in a constant amount even if the movement amount of the piston is controlled. Therefore, measures are taken to remove air in the liquid.

FIGS. 6 and 7 are a cross-sectional front view and a plan view of a main part showing an example of a conventional defoaming apparatus, respectively. 6 and 7, reference numeral 1 denotes a rotating body, which is formed in a disc shape and integrally provided with a protruding edge 2 at a peripheral edge thereof, and is configured to be rotatable via a driving means 3 and a rotating shaft 4. ing. The driving means 3 is constituted by a motor, a pulley, a belt, a gear, etc., not shown. Next, reference numeral 5 denotes a syringe which is detachable on the rotating body 1 and has an inner diameter of 15 to 2 for example.
At one end of a hollow cylinder having a length of 0 mm and a length of 100 mm, a discharge port 6 having a small diameter of, for example, 2 to 3 mm is provided, and a disc-shaped piston 7 is slidably interposed at the other open end. It is formed. Reference numeral 8 denotes a cap, which is detachably provided to the discharge port 6.

When the syringe 5 having the above structure is filled with the liquid 9, the cap 8 is removed, and the piston 7 is pressed by air pressure or an extruding rod, an amount of the liquid 9 corresponding to the amount of movement of the piston 7 from the discharge port 6 is obtained. Can be discharged.

In order to remove air or air bubbles mixed in the liquid 9 in the syringe 5, the syringe 5 in which the liquid 9 is filled and the discharge port 6 is fitted with the cap 8 is connected to the cap 8 with the protruding edge 2. Is mounted on the rotating body 1 (the mounting means is not shown), and the rotating body 1 is rotated around the rotating shaft 4 via the driving means 3. This makes the syringe 5
A centrifugal force acts on the liquid 9 inside, and the centrifugal force is proportional to the mass of the object, so that the air or bubbles mixed into the liquid 9 moves to the side having a smaller radius of curvature, that is, the piston 7 side. 9 is separated.

[0006]

However, the above-described conventional defoaming apparatus has the following problems. (1) For a general air dispenser, use a syringe 5
Since the flat-plate-shaped piston 7 is simply loosely fitted to the open end portion of the rotary member 1, the accuracy of the fixed-quantity discharge is low, and the discharge port 6 can be set only on the protruding edge 2 side of the rotating body 1. . For this reason, the mixed air or air bubbles move to the piston 7 side, and when used as an air dispenser, when the amount of the liquid 9 remaining in the syringe 5 becomes small, the air or air bubbles separated together with the liquid 9 are also removed. In some cases, the ink is ejected at the same time, and the fixed amount ejection may not be performed.

(2) Only the air or air bubbles mixed in the liquid 9 is separated in the syringe 5, and there is no function of removing the separated gas out of the syringe 5. (3) Since it depends only on the centrifugal force due to the gas-liquid mass difference, it cannot be applied to, for example, defoaming of a liquid containing a metal filler or the like.

(4) In the case of a high-viscosity liquid such as an adhesive or a resin material, since the movement of the air or bubbles mixed therein is slow, a minute liquid having a diameter of 0.1 to 0.2 mm, for example, is used. Separation of bubbles is not possible or takes a long time to separate.

In the case of a mechanical dispenser in which a rod is provided on the piston 7 or the piston 7 is moved by an extruding rod, the above problems (1) and (2) may be solved. The problems of (3) and (4) still remain.

An object of the present invention is to provide a defoaming apparatus which can solve the problems existing in the prior art described above and can easily and surely remove air bubbles mixed in a high-viscosity liquid filled in a syringe. It is the purpose.

[0011]

In order to achieve the above object, according to the present invention, a syringe filled with a liquid is attached to and detached from a rotating body formed to rotate via a driving means and a rotating shaft. In a defoaming device that is mounted as possible and configured to separate bubbles mixed in the liquid, at least the rotating body and the syringe are housed in a decompression chamber having a pressure lower than the atmospheric pressure, and the syringe is a hollow cylindrical body. A liquid discharge port is provided at one end and a piston is interposed at the other end, and the syringe is disposed such that the discharge port is located on the rotation shaft side of the rotating body. ,
The technical means that was adopted.

In the present invention, the axes of the plurality of syringes can be arranged so as not to intersect with the axis of the rotating shaft. In the above invention, 2n (n is a natural number) syringes can be disposed symmetrically with respect to the axis of the rotation shaft.

Further, in the above invention, the discharge ports of the plurality of syringes can be connected by a hollow member having an opening communicating with the decompression chamber. In the above invention, a piston rod can be detachably provided outside the piston.

Still further, in the above invention, a piston rod formed so that its axial length can be varied outside the piston can be provided.

[0015]

According to the above construction, not only air or air bubbles mixed into the liquid in the syringe are separated by the centrifugal force due to the rotation of the rotating body, but also concentrated on the discharge port side of the syringe, and further decompressed by the decompression chamber. By the action, even small air bubbles expand, and can be easily removed out of the syringe.

[0016]

FIG. 1 is a sectional front view of an essential part showing an embodiment of the present invention. FIG. 2 is a view taken along the line AA in FIG. 1, and the same parts are indicated by the same reference numerals as in FIGS. 6 and 7.
1 and 2, reference numeral 10 denotes a decompression chamber,
The rotating body 1 is formed so as to be accommodated therein, and a lid 11 which is provided detachably or openably and closably is provided to be air-tight, and a sealing member 12 is interposed in a penetrating portion of the rotating shaft 4. The decompression chamber 10 is connected to a decompression source 14 via a suction pipe 13.

Next, a piston rod 15 is provided outside the piston 7 interposed in the syringe 5. The syringe 5 is attached to and detached from the rotating body 1 via mounting means (not shown) so that the outer end of the piston rod 15 is inscribed in the protruding edge 2 and the discharge port 6 is located on the rotating shaft 4 side. Mount as possible. Reference numeral 16 denotes a hollow member which connects the discharge ports 6 and 6 of the two syringes 5 and 5 and has an opening 17 communicating with the decompression chamber 10. The position of the syringe 5 on the rotating body 1 is preferably such that the axis of the syringe 5 does not intersect with the axis of the rotating shaft 4.

With the above configuration, the syringe 5 filled with the liquid 9 is mounted on the rotating body 1 as shown in FIGS. 1 and 2, a hollow member 16 is connected between the discharge ports 6 and 6, and the lid 11 is used. The decompression chamber 10 is hermetically sealed. Next, the rotating body 1 is rotated via the driving means 3 and the rotating shaft 4 and the pressure reducing source 14 is operated to reduce the pressure in the pressure reducing chamber 10.

By the above operation, the liquid 9 in the syringe 5 is
The air or air bubbles mixed therein are moved toward the discharge port 6 due to the difference in centrifugal force with the liquid 9, and
Since the pressure in the chamber 0 is reduced to less than the atmospheric pressure, the air is further sucked into the hollow member 16 and removed from the opening 17. Therefore, air or air bubbles can be completely removed and defoamed from the liquid 9 in the syringe 5.

In this case, it is efficient that a plurality of syringes 5 can be mounted on the rotating body 1. However, as shown in FIG. When they are arranged in an intersecting state, the work of connecting the discharge ports 6 and 6 by the hollow member 16 becomes easy. Further, in order to secure the action of the centrifugal force, the rotating body 1 is usually rotated at a high speed, so that 2n (n is a natural number) syringes 5
Is preferably arranged symmetrically with respect to the axis or axis of the rotating shaft 4 from the viewpoint of securing the balance of the rotating body 1 and preventing vibration. The defoaming action is the same even if the hollow member 16 is omitted.

FIGS. 3 to 5 are explanatory views showing modified examples of the piston rod in the present invention, and show examples of a configuration in which the axial length of the piston rod is variable. That is, as shown in FIGS. 1 and 2, when the syringe 5 is mounted on the rotating body 1, the axial length of the piston rod 15 is desirably as small as possible. When the liquid 9 in the inside is discharged, the axial length of the piston rod 15 is desirably large.

First, in FIG. 3, reference numeral 21 denotes a piston rod with a chuck, and a chuck 2 provided integrally with an end portion.
2, the piston rod 15 can be disengaged from the piston rod 15. In this case, the chuck 22 rotates the claw 23 by rotation.
Has an inner diameter variably formed. Reference numeral 24 denotes an O-ring, which is fitted on the outer periphery of the piston 7 and is formed so as to be able to slide closely on the inner wall of the syringe 5. Therefore, when used as a dispenser after defoaming, the chuck-equipped piston rod 21 is
5, the axial length of the piston rod can be increased, and the work of discharging the liquid becomes easy.

Next, in FIG. 4, reference numeral 25 denotes a threaded piston rod, which is provided on the piston rod 15.
Male screw 27 is provided at the end. In this case, the piston rod 15 may be provided with a screw, and the threaded piston rod 25 may be provided with a female thread.

FIG. 5 shows an example in which the axial length of the piston rod 15 itself is made variable. First, FIG.
In (a), the piston rod 15 is divided into a rod 15a integral with the piston 7 and a rod 15b at a free end, the rods 15a and 15b are connected via a pin 28, and the rod 15b is bent. Form as possible. At the time of defoaming, the piston rod 15 is moved to the position shown in FIG.
In the state shown in (a), when used as a dispenser, the rods 15a and 15b are linear.

On the other hand, the one shown in FIG. 5B is one in which the piston rod 15 is formed so as to be able to expand and contract in the axial direction.
That is, a rod 15a integral with the piston 7 is formed in a hollow shape, and a tapered screw 29 and a slit 30 extending in the axial direction are provided at its free end. On the other hand rod 15b
Is formed in the rod 15a so as to be able to advance and retreat,
a can be fixed by a nut 31 interposed at the free end of the a. At the time of defoaming, the rod 15b is connected to the rod 1
It is fixed via the nut 31 in a state where it has entered the inside 5a. On the other hand, when the piston rod 15 is used as a dispenser, if the nut 31 is loosened, the rod 15b is pulled out to the right, and then fixed via the nut 31, the axial length of the piston rod 15 can be increased. In this case, rod 15b
Is formed in a hollow shape, the nut 31 is interposed, and the rod 15
The operation is the same even if a is formed so as to be able to advance and retreat in the rod 15b.

In the above embodiment, the decompression chamber 1
Although an example in which 0 is reduced to a pressure lower than the atmospheric pressure has been described, a vacuum chamber connected to a vacuum source may be used in consideration of the viscosity of the liquid 9 and the size of bubbles to be mixed. If necessary, the driving means 3 may be housed in the decompression chamber 10 or the vacuum chamber. Needless to say, the shape of the chamber is not limited to that of the above embodiment.

[0027]

Since the present invention has the configuration and operation as described above, the following effects can be obtained.

(1) The air or bubbles mixed in the liquid filled in the syringe can be almost completely removed from the syringe by reduced pressure or vacuum, not only by separation by centrifugal force.

(2) When the defoamed syringe is used as a dispenser, since there are no bubbles in the liquid, even a high-viscosity liquid can discharge a very small amount or precisely in a fixed amount, and can discharge the liquid in the syringe. Even if the remaining amount of the liquid is small, it is possible to discharge a fixed amount.

(3) Even for a syringe having a relatively long axial dimension, defoaming can be performed in a state in which the projecting length of the liquid discharge piston rod out of the syringe is shortened, so that the entire apparatus can be downsized.

[Brief description of the drawings]

FIG. 1 is a sectional front view of a main part showing an embodiment of the present invention.

FIG. 2 is a view taken along line AA in FIG.

FIG. 3 is an explanatory view showing a modification of the piston rod in the present invention.

FIG. 4 is an explanatory view showing a modified example of the piston rod in the present invention.

FIG. 5 is an explanatory view showing a modified example of the piston rod in the present invention.

FIG. 6 is a sectional front view of a main part showing an example of a conventional defoaming device.

FIG. 7 is a plan view of a main part showing an example of a conventional defoaming device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating body 5 Syringe 7 Piston 10 Decompression chamber 14 Decompression source 15 Piston rod

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-262503 (JP, A) JP-A-63-19556 (JP, A) JP-A-62-210009 (JP, A) 17801 (JP, U) Japanese Utility Model Showa 60-13251 (JP, U) Tokuhyo Hei 4-506116 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B01D 19/00 102

Claims (6)

(57) [Claims] 1. A structure in which a syringe filled with a liquid is detachably mounted on a rotating body formed to rotate via a driving means and a rotating shaft, and air bubbles mixed into the liquid are separated. In the defoaming device, at least the rotating body and the syringe are accommodated in a decompression chamber having a pressure lower than the atmospheric pressure, and the syringe is provided with a liquid discharge port at one end of the hollow cylinder and at the other end. A defoaming device having a configuration in which a piston is interposed, and wherein the syringe is disposed such that a discharge port thereof is located on a rotation shaft side of the rotating body. 2. The defoaming device according to claim 1, wherein the axes of the plurality of syringes are arranged so as not to intersect with the axis of the rotating shaft. 3. The defoaming device according to claim 1, wherein 2n (n is a natural number) syringes are disposed symmetrically with respect to the axis of the rotating shaft. 4. The defoaming device according to claim 2, wherein the discharge ports of the plurality of syringes are connected by a hollow member having an opening communicating with the decompression chamber. 5. The defoaming device according to claim 1, wherein a piston rod is detachably provided outside the piston. 6. The defoaming device according to claim 1, further comprising a piston rod formed outside the piston so that its axial length is variable.