JP2007289655A - Syringe pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a syringe pump wherein replenishing of a liquid is easy, a structure is simple, and each joining part has no level difference. <P>SOLUTION: A syringe is integrally or separately formed to be two stages of a small diameter part and a large diameter part both of which forms an inner diameter cylindrically. A discharging port is provided at the end of the small diameter part, and a plunger which fits into the inner diameter of the small diameter part is made to project from the opening part of the large diameter part to be connected with a plunger driving device, and the plunger is inserted into the small diameter part to discharge the liquid from a discharging port. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a syringe pump used for analysis, liquid feeding, and coating of fluids such as gas, chemicals, adhesives, pastes, and the like for dispensing and inhaling a small amount.

In a syringe pump in which the piston is controlled by a ball screw, a linear motor, etc., if a syringe with a small volume and a small diameter is used to discharge a minute amount of liquid, it is possible to ensure a highly accurate minute amount discharge.

When all the liquid in the syringe is discharged, it seems that the replenishment of the liquid is pulled. However, the small-capacity syringe is troublesome because the replenishment frequency of the liquid increases. Therefore, conventionally, since it was premised that the amount of liquid consumption was large, the tank was set separately, the syringe was connected with piping material, an open / close valve was provided, and its control device was also required. A syringe with a long stroke is used to eliminate the number of times of replenishment of liquid (in order to increase the capacity of the syringe).
Japanese Patent Laid-Open No. 06-170302 Japanese Patent Laid-Open No. 10-307051

However, in the case of a syringe using the piping material or the opening / closing valve, bubbles remain at a step or the like generated at the connecting portion, and an adverse effect occurs. Further, in the case of a syringe with a long stroke, it is expensive to process a precise long cylinder, or resin molding is difficult.

Therefore, an object of the present invention is to provide a syringe pump that can be easily replenished with liquid, has a simple structure, and does not have a step at each joint.

Solution

The first means for solving the above-mentioned problems is that, according to claim 1, the syringe is formed integrally or separately in two stages of a small diameter portion and a large diameter portion having an inner diameter formed into a cylinder, and a discharge port is formed at the end of the small diameter portion. And a plunger that fits into the inner diameter of the small diameter portion protrudes from the opening of the large diameter portion, is connected to the plunger driving device, and the plunger is inserted into the small diameter portion to discharge the liquid from the discharge port. To do.

According to another aspect of the present invention, a stirring blade is provided in the large diameter portion of the plunger.

According to another aspect of the present invention, a bubble system that opens and closes the conduction between the large-diameter portion and the small-diameter portion is installed at the connecting portion between the large-diameter portion and the small-diameter portion.

Preferred embodiment

A first embodiment of a syringe pump of the present invention will be described with reference to FIG.

The syringe pump of the present invention includes a syringe 1 in which a small-diameter portion 2 having a discharge port 16 formed on one side and a large-diameter portion 3 having an opening on one side are integrally formed in two stages, and a precise cylindrical shape of the small-diameter portion 2 The plunger 4 is closely fitted to the inner diameter of the nozzle and pushed into the small-diameter portion 2 to discharge the liquid 5 from the discharge port 6, and the plunger driving device 7 connected to the plunger 4. . The plunger 4 is sealed against the inner diameter of the small diameter portion 2 with an O-ring or the like (not shown). The plunger 4 is controlled by a plunger driving device 7 for replenishing the liquid 5 and discharging the liquid 5.

When the plunger 4 is pulled into the large-diameter portion 3 by the plunger driving device 7, the syringe pump having the above configuration has a large diameter because the inner diameter of the large-diameter portion 3 communicates with the inner diameter of the small-diameter portion 2. The liquid 5 filled in the part 3 flows into the small diameter part 2. Thereafter, when the liquid 5 completely fills the small-diameter portion 2, the plunger 4 is pushed into the small-diameter portion 2 by the plunger driving device 7 to seal the inner diameter of the small-diameter portion 2, thereby stopping the inflow of the liquid 5. Finish replenishing. Then, the plunger 5 is discharged from the discharge port 6 by inserting a set amount of the plunger 4 into the small diameter portion 2 by the plunger driving device 7.

When the liquid 5 is a high-viscosity liquid such as a paste, the liquid 5 flows into the small-diameter portion 2 by applying a gas pressure in the large-diameter portion 3. In this case, it is necessary to install a member (not shown) that closes the opening at the end of the large diameter portion 3.

Advantages of Example 1

Next, advantages (effects in the present invention) of the syringe pump of the present invention used in Example 1 will be listed.

With each configuration as described above, there is no need for a tank, a switching valve, piping, or the like, which is a conventional drawback. In addition, since there is no liquid 5 staying portion as in the prior art, the bubbles can be discharged to the large diameter portion 3.

In addition, since the volume of the small diameter portion 2 can be extremely reduced, high-precision discharge can be measured, and the plunger 4 can be moved at high speed to enable droplet discharge. Further, since the liquid supply and discharge operations can be performed only by the axial movement of the plunger 4, the plunger driving device 7 can be easily configured only by adding the conventional liquid supply operation.

Further, since the sliding portion between the plunging 4 and the small diameter portion 2 is submerged in the liquid 5, the liquid 5 is hard to be cured. For example, it is discharged to an instantaneous adhesive or a resin that is impressed in the atmosphere. Suitable for. In addition, since the liquid 5 is pressurized (atmospheric pressure, gas pressure) at the time of replenishment, the liquid 5 does not evaporate. Therefore, the solvent evaporates as in the case of absorbing the liquid at a negative pressure, and bubbles are generated in the liquid. And will not float.

Further, since only the small-diameter portion 2 is precisely formed, a long precision processing step as in the prior art is unnecessary, the manufacturing cost is not expensive, and there is no difficulty such as resin molding. In addition, since the production is simple, maintenance such as disassembly and cleaning is easier than conventional syringe pumps.

Furthermore, the outer periphery of the small diameter part 2 can be used as an attachment part to the machine, and the three steps of the large diameter part can be used for stopping in the axial direction. Moreover, since the small diameter part 2 has a small inner diameter, the discharge pressure can be increased. For example, the discharge port can be connected to a mold and used for resin molding.

Next, a second embodiment of the syringe pump of the present invention will be described with reference to FIG.

The syringe pump of this invention is the simple structure which used the commercially available syringe as the large diameter part tank. Specifically, the syringe pump of the present invention has a syringe 10 provided with a plunger 16 in a large-diameter portion 10A and a luer taper hole 14 fitted to a luer taper coupling 12 provided below the syringe 10 at the upper end. And a small diameter syringe 11 having a cylindrical hole-shaped small diameter portion 13 communicating with the luer tapered hole 14 and a nozzle 15 provided at the lower end of the small diameter syringe 11.

A cap 18 is attached to the open end of the syringe 10, and an air inlet 19 is provided in the cap 18. The plunger 16 fitted to the small diameter portion 13 passes through the cap 18 and is connected to the plunger driving device 20.

In the syringe pump having the above-described configuration, when the plunger 16 is pulled into the large diameter portion 10A of the syringe 10 by the plunger driving device 20, the liquid 22 in the large diameter portion 10A enters the small diameter portion 13 of the small diameter syringe 11. Inflow. Thereafter, when the plunger 16 is moved into the small diameter portion 13 by the plunger driving device 20, the liquid 22 in the small diameter portion 13 is discharged from the nozzle 15 at the tip. At this time, when the viscosity of the liquid 22 is high, pressurized air is introduced from the air inlet 19 to pump the liquid 22.

Advantages of Example 2

Next, advantages (effects in the present invention) of the syringe pump of the present invention used in Example 2 will be listed.

The syringe 10 that constitutes the syringe pump is a commercially available product, and the small-diameter syringe 11 has a simple structure, so that the whole can be provided at low cost.

Next, a third embodiment of the syringe pump of the present invention will be described with reference to FIG.

The syringe pump of the present invention is a liquid supply air pressure feed type in which a large-diameter syringe 30 and a small-diameter syringe 31 of a commercially available syringe are connected by a joint 32. The joint 32 includes a luer coupling portion 33 coupled to the large diameter syringe 30 and a flange coupling portion 34 coupled to the small diameter syringe 31. A plunger 36 that opens and closes the inflow port 35 is provided at the shaft core of the large diameter portion 30A of the large diameter syringe 30, and a plunger driving device 41 is provided at the end protruding from the large diameter portion 30A of the plunger 36. Yes. The plunger 36 is provided with an air passage 37 for introducing pressure air along the longitudinal direction of the shaft core. A check valve or the like is provided at the tip of the air passage 37 to prevent the liquid 40 from entering. A discharge port 39 for the liquid 38 is provided at the tip of the small diameter portion 31 </ b> A of the small diameter syringe 31.

And the syringe pump which consists of the said structure drives with the plunger drive device 41, pulls up the plunger 36, open | releases the inflow port 35, and flows in the liquid 40 in the large diameter part 30A in the small diameter part 31A. After that, the plunger 38 is driven by the plunger driving device 41 to lower the plunger 36 to come into contact with the inflow port 35, and the pressure air is introduced into the air passage 37 and fed into the small diameter portion 31 </ b> A, whereby the liquid 38 is discharged from the discharge port 39. Discharge.

Advantages of Example 3

Next, advantages (effects in the present invention) of the syringe pump of the present invention used in Example 3 will be listed.

Since liquid supply is possible with the small-diameter syringe 31 attached to an automatic machine or the like, the trouble of nozzle readjustment can be saved. The whole can be provided at low cost by combining commercially available syringes.

Next, a fourth embodiment of the syringe pump of the present invention will be described with reference to FIG.

The syringe pump of the present invention is fitted into the syringe 50 in which the small-diameter portion 52 and the large-diameter portion 53 are integrally formed in two steps, the inner diameter and the honey of the small-diameter portion 52, and is pushed into the small-diameter portion 52 as in the first embodiment. And a plunger driving mechanism 57 for controlling the movement of the plunger 54. The plunger 54 is equipped with a stirring blade 59 that rotates at the large-diameter portion 53, and is rotatably supported via a rotation unit 58 provided at the shaft end portion of the plunger 54.

And when the syringe pump which consists of the said structure drives with the plunger drive device 57 and pulls up the plunger 54, the internal diameter of the small diameter part 52 and the internal diameter of the large diameter part 53 will connect, and the inside of the large diameter part 53 The liquid 55 flows into the small diameter portion 52. When the liquid 55 completely fills the inside of the small diameter part 52, the plunger 54 is moved and pushed into the small diameter part 52 to stop the inflow of the liquid 55 and the replenishment of the liquid 55 is finished. Thereafter, the plunger 54 is further moved into the small diameter portion 52 to discharge the liquid from the discharge port 56, and the stirring blade 59 is rotated in the large diameter portion 53 via the rotation unit 58. The liquid 55 flowing into 52 is stirred. By repeating the above steps, the liquid 55 is continuously discharged. The agitation blade 59 can be attached not only directly to the plunger 54, but also can be mounted with a rotating shaft on the same axis, and the plunger 54 can be set apart.

Advantages of Example 4

Next, advantages (effects in the present invention) of the syringe pump of the present invention used in Example 4 will be listed.

According to the syringe pump of the present invention, the agitated liquid can immediately flow into the small-diameter portion 52 without passing through a long pipe line or the like as in the prior art, so that there is an advantage that any liquid can be used as a target. is there.

Next, a fifth embodiment of the syringe pump of the present invention will be described with reference to FIG.

As in the first embodiment, the syringe pump according to the present invention includes a syringe 60 in which a small diameter portion 62 and a large diameter portion 61 are integrally formed in two stages, a plunger 63 inserted in the center of the syringe 60, and movement of the plunger 63. It is connected to a plunger drive device 71 to be controlled. The integrally formed portion of the large-diameter portion 61 and the small-diameter portion 62 is formed as a connection taper portion 64, is in close contact with the inside of the connection taper portion 64, is concentric with the plunger 63, and is provided on the outer periphery of the plunger 63. A valve stem 65 is provided on the pipe shaft 66. Further, the valve stem 65 is formed with a plunger 63 and a slidable hole at the center. A solenoid block 67 is connected to the upper side of the syringe 60, and a ring-shaped movable iron core 68 is fixed to the pipe shaft 66. The movable iron core 68 is always pressed downward by the spring 69 to press the valve stem 65 against the connecting taper portion 64. A coil 70 is disposed around the outer periphery of the movable iron core 68. When the coil is energized, the movable iron core 68 is lifted upward, the valve stem 65 is lifted from the connecting taber portion 64, and the large diameter portion 61 and the small diameter portion 62 are electrically connected. . The plunger 63 protrudes from the upper surface of the solenoid block 67 and is connected to the plunger drive device 71. A liquid passage hole 72 is formed below the pipe shaft 66 so that the liquid 80 flows into the upper part of the sliding surface of the plunger 63 and the valve stem 65. A diaphragm (not shown) is installed between the lower end of the solenoid block 67 and the pipe shaft 66 to prevent the liquid 80 from flowing into the solenoid block 67. An inlet port 75 for the liquid 80 is provided above the syringe 60 and connected to a liquid tank (not shown).

And when the syringe pump which consists of the said structure drives with the plunger drive device 57, pulls up the plunger 54, energizes the coil 70, raises the valve stem 65, and introduce | transduces the liquid 80 from the liquid tank from the inlet 75, The liquid 80 fills the large diameter portion 61 and the small diameter portion 62. Thereafter, the energization of the coil 70 is stopped, the valve stem 65 is lowered, and is brought into close contact with the connecting taber portion 64 to cut off the conduction between the large diameter portion 61 and the small diameter portion 62. Then, when the plunger driving device 57 is driven to push the plunger 54 into the small diameter portion 62, the liquid 80 is discharged from the nozzle 76. Thereafter, the discharge of the liquid 80 is repeated, and when the plunger 63 comes to the pushing end, the plunger driving device 71 pulls the plunger 63. At this time, when the valve stem 65 is pulled up, the liquid 80 is introduced into the small diameter portion 62 and can be filled with the liquid without making a negative pressure. Further, when the plunger 63 is pulled up to the vicinity of the valve stem 65 and the valve stem 65 is closed, the plunger 80 is lifted up a little to suck up the liquid 80, so that the liquid 80 pops out from the nozzle 76 due to the impact of closing the valve stem 65. To prevent.

Note that the valve stem 65 of the above embodiment can be easily changed in structure according to the liquid such as all rubber, O-ring installation, or fluorine resin. Further, the vertical movement of the valve stem 65 of the above embodiment can be easily changed in structure such as a solenoid and an air cylinder cam mechanism. In addition, the plunger 63 of the above embodiment can be configured so that only the insertion portion to the small diameter portion 62 is formed thin so that a small amount of discharge can be measured. Therefore, the introduction port 75 for the liquid 80 may not be installed.

Advantages of Example 5

Next, advantages (effects in the present invention) of the syringe pump of the present invention used in Example 5 will be listed.

According to the syringe pump of the present invention, when the liquid 80 is filled, the small-diameter portion 62 does not become a negative pressure, so that bubbles can be prevented from being mixed.

Since the plunger 63, the valve stem 65, and the sliding portion are immersed in the liquid, the friction is small, and the generation of friction powder is extremely small compared to the conventional case. Also, there is no bleed liquid in contact with air, and the curable liquid does not cure.
(If it is assumed that there is no liquid in the valve stem 65, the bleeding liquid is a state in which the liquid on the small diameter portion 62 side oozes out from the sliding portion of the valve stem 65 and the plunger 63). This can be applied to anaerobic adhesives such as instant adhesives and UV curable resins. In addition, since a switching valve for switching between supply and discharge of the liquid 80 is not required as in the prior art, the structure is simple and the advantages of low cost are great.

Sectional drawing which shows 1st Embodiment of the syringe pump of this invention Sectional drawing which shows 2nd Embodiment of the syringe pump of this invention Sectional drawing which shows 3rd Embodiment of the syringe pump of this invention Sectional drawing which shows 4th Embodiment of the syringe pump of this invention Sectional drawing which shows 5th Embodiment of the syringe pump of this invention

Explanation of symbols

1, 10, 30, 50, 60, syringe 2, 13, 30A, 52, 62, small diameter part 3, 10A, 31A, 53, 61, large diameter part 4, 16, 36, 54, 63, plunger 55, Stirrer blade 65, valve stem

Claims (3)

The syringe is formed in two stages, a small-diameter part whose inner diameter is formed into a cylinder and a large-diameter part, or is formed separately or separately. A discharge port is provided at the end of the small-diameter part, and a plunger that fits into the small-diameter inner diameter is large. A syringe pump characterized in that it protrudes from an opening of a diameter part, is connected to a plunger drive device, inserts the plunger into a small diameter part, and discharges the liquid from the discharge port. The syringe pump according to claim 1, wherein a stirring blade is provided in the large-diameter portion of the plunger. The syringe pump according to claim 1, wherein a bubble system that opens and closes conduction between the large-diameter portion and the small-diameter portion is installed at a connecting portion between the large-diameter portion and the small-diameter portion.

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