JP5338281B2 - Syringe - Google Patents

Description

  The present invention relates to a syringe that holds a fluid material such as a liquid and discharges the liquid from a tip opening.

  A cylindrical container that holds a fluid material such as a liquid, a nozzle member that is attached to the tip of the cylindrical container, and a nozzle member that is inserted into the cylindrical container from the proximal end side of the cylindrical container. There is known a syringe that includes a plunger that presses toward a nozzle and discharges material from a nozzle member. Such a syringe is capable of quantitative discharge of material by being connected to a quantitative discharge device (dispenser), and is used, for example, in a process of applying a solder paste to a substrate. In addition, since it is difficult to precisely control the discharge amount when air is contained in the material, it is common to degas the material in advance. Such a syringe is usually used with the nozzle member facing downward.

  In the syringe, for example, as described in Patent Document 1, a screw is provided at the tip of the cylindrical container, and a locking piece that engages with the screw is provided in the nozzle member, whereby the cylindrical container and the nozzle are arranged. The member can be attached and detached. Therefore, nozzle members having different shapes and materials can be selected and mounted according to the properties and applications of the fluid material to be discharged. As the flowable material, not only a low-viscosity liquid such as a solvent, oil or adhesive, but also a high-viscosity material such as a conductive adhesive or brazing paste can be discharged.

In the case where the syringe in which the nozzle member can be attached and detached is stored in a state in which the nozzle member is filled, a closing cap can be attached to the cylindrical container instead of the nozzle member. The closure cap can be attached to and detached from the cylindrical container in the same manner as the nozzle member by providing an engagement structure similar to that of the various nozzle members.
JP 2007-268532 A

  The syringe filled with the material is stored in the same posture as in use so that the plunger is positioned upward and the closing cap is positioned downward. However, since a material having a high viscosity and a large specific gravity (for example, a gold-tin solder paste) easily falls from the opening of the cylindrical container, the material may be leaked. Furthermore, when the dispenser is connected and stored in this manner, the plunger does not move, so that a cavity is created in the material as the material moves, and air is mixed into the cavity. May be deteriorated, and the discharge amount when the material is quantitatively discharged using a dispenser may be unstable.

  This invention is made | formed in view of such a situation, and it aims at providing the syringe which can prevent the leakage of the material at the time of vertical storage, and generation | occurrence | production of the cavity in material.

The present invention includes a cylindrical container that forms a cylindrical material holding space whose both ends are open, and is fitted to the inner surface of the cylindrical container so as to be able to advance and retreat, thereby closing the proximal end side of the material holding space. A plunger for changing the volume of the material holding space, and the plunger is advanced toward the nozzle member in a state in which the nozzle member connected to the distal end opening of the material holding space is mounted on the cylindrical container. Accordingly, the syringe discharges the liquid held in the material holding space from the nozzle member, and the syringe is attached to the tip of the cylindrical container instead of the nozzle member, and the tip of the material holding space A cap that closes the side, the cap having a bottom surface facing the tip opening, and a hole into which the tip of the cylindrical container is inserted; and the bottom; Is arranged between the serial distal opening is fitted into the hole of the cap body, and a closure piece having a closure surface that abuts on the front end opening portion, the inner peripheral surface of the hole portion of the cap body Is formed in a tapered shape, and the closing piece has the closing surface and is fitted to the inner peripheral surface of the hole, and is continuously provided on the disk portion. that having a and the small diameter of the cylindrical portion than the parts.

According to this syringe, by attaching a closing cap instead of the nozzle member, the proximal end side of the material holding space can be closed by the plunger, and the distal end opening of the material holding space can be closed by the closing cap. Thereby, the material holding space can be closed and leakage of the material can be prevented. Further, since the closing piece fitted in the closing cap abuts the tip opening, the space communicating with the material holding space can be eliminated, so that the generation of a cavity due to the leakage of the material can be prevented.
In this case, since the disc portion of the closing piece is fitted to the inner peripheral surface of the tapered tapered hole, the tip opening is securely closed by pressing the tip opening of the cylindrical container strongly against the closing surface. The closing piece can be securely held by the closing cap.

  In this syringe, it is preferable that the cylindrical container and the cap body are provided with an engagement structure that is screwed together. That is, by using an engagement structure in which the cylindrical container and the nozzle member are screwed together, it is possible to easily and reliably hold the closing cap on the cylindrical container without providing a separate structure for holding the closing cap. it can.

Furthermore, when the cap body and the cylindrical container are screwed together, it becomes easy to strongly press the closing surface against the tip opening by screwing the cap body. That is, by screwing the cap body into the cylindrical container, a reaction force between the closing piece and the tip opening can be easily generated, and the tip opening can be more reliably closed.

  According to the syringe of the present invention, it is possible to prevent leakage of the material during vertical storage and mixing of air into the material, so that the discharge amount at the time of constant discharge can be stabilized.

Hereinafter, the syringe according to the present invention will be described with reference to the drawings. As shown in FIG. 1, the syringe 10 includes a cylindrical container 20 that forms a cylindrical material holding space 21 that is open at both ends, a plunger 30 that fits in and out of the inner surface of the material holding space 21, and a cylinder And a closing cap 40 attached to the distal end side of the container 20.
If the syringe 10 is filled with, for example, a gold-tin solder paste and is attached to a nozzle member instead of the closing cap 40, the gold-tin solder paste can be discharged and applied to a substrate or the like.

  In this syringe 10, the plunger 30 is directed to the nozzle member in a state where a nozzle member (not shown) connected to the tip opening 21 a of the material holding space 21 is attached to the cylindrical container 20 instead of the closing cap 40. Thus, the volume of the material holding space 21 can be reduced, and the material held in the material holding space 21 can be discharged from the nozzle member.

  The plunger 30 is fitted into the inner surface of the material holding space 21 of the cylindrical container 20 and closes the proximal end side of the material holding space 21. As shown in FIG. 1, the plunger 30 can be advanced toward the nozzle member by the pressure of air supplied from a dispenser (not shown) through an adapter A attached to the proximal end of the cylindrical container 20. it can.

  As shown in FIG. 2, at the distal end of the cylindrical container 20, an inner cylindrical portion 22 having a distal end opening 21 a of a material holding space 21 and an outer cylindrical portion provided coaxially on the outer side of the inner cylindrical portion 22. 23. A tip opening 21 a of the material holding space 21 is opened at the tip of the inner cylinder portion 22. The outer cylinder part 23 has a larger diameter than the inner cylinder part 22, and two threads (engagement structure parts) 23a are formed on the inner peripheral surface thereof. In the cylindrical container 20, the distal end of the inner cylindrical portion 22 protrudes from the distal end of the outer cylindrical portion 23.

  As shown in FIG. 2, the closing cap 40 includes a cap main body 50 attached to the tip of the cylindrical container 20, and a closing piece 60 sandwiched between the cap main body 50 and the tip opening 21 a of the cylindrical container 20. And have.

  The cap body 50 includes a hole 51 into which the distal end portion (inner cylinder portion 22) of the cylindrical container 20 is inserted and two threads (engagement structure portion) that engage with the outer cylinder portion 23 of the cylindrical container 20. ) 52a. The hole 51 has a bottom surface 51a facing the tip opening 21a and a tapered inner peripheral surface 51b. The engaging portion 52 is formed at a position close to the opening side end portion of the hole portion 51. The cap body is attached to the cylindrical container 20 by inserting the inner cylinder portion 22 into the hole portion 51 and screwing the thread 52a with the thread 23a of the outer cylinder 23.

  The closing piece 60 includes a disc portion 61 and a cylindrical portion 62 that is provided continuously to the disc portion 61 and has a smaller diameter than the disc portion 61. The disc part 61 is formed in a size that fits into the inner peripheral surface 51 b of the tapered tapered hole part 51, and is fixed to the middle part of the hole part 51 by being pushed into the hole part 51. The cylindrical portion 62 is formed in a size that does not contact the inner peripheral surface 51 b of the hole portion 51 in a state where the disc portion 61 is fixed to the hole portion 51. In the disc portion 61, the end surface opposite to the columnar portion 62 is a closing surface 61 a that abuts the tip opening 21 a and closes the tip opening 21 a of the material holding space 21.

  In this syringe 10, the state which attached the closure cap 40 to the cylindrical container 20 is shown in FIG. When the closing piece 60 is accommodated in the hole 51 of the cap main body 50, the screw cap 52a of the cap main body 50 is screwed into the screw thread 23a of the cylindrical container 20 so that the cylindrical cap 20 is closed. It is attached to the tip of 20.

  In this state, the inner cylindrical portion 22 of the cylindrical container 20 is inserted into the hole 51 of the cap body 50, and the closing surface 61 a of the closing piece 60 is in contact with the distal end surface of the inner cylindrical portion 22. Since the outer peripheral surface of the disc part 61 is fitted in the middle position of the inner peripheral surface 51b of the cap main body 50 in the closing piece 60, the cap main body 50 is screwed into the cylindrical container 20, and the taper-shaped hole 51 is provided. Is advanced toward the tip opening 21a, the closing surface 61a is strongly pressed against the tip opening 21a.

  At this time, since the cylindrical portion 62 of the closing piece 60 has a smaller diameter than the disc portion 61, it contacts the inner peripheral surface 51b of the tapered hole portion 51 of the cap body 50 and functions as a guide at the time of insertion. . For this reason, the closing surface 61a that contacts the tip opening 21 is not easily tilted, and the tip opening 21 can be reliably closed.

  As shown in FIG. 4, the syringe 10 in which the distal end opening 21a of the material holding space 21 is closed by the closing cap 40 as described above is moved downward by using the holder B for vertical placement. Can be stored facing. At this time, as shown in FIG. 5, if the closing piece 60 is not provided, a space is formed below the tip opening 21a. At this time, if a dispenser is connected to the syringe, the plunger 30 is regulated by the dispenser and does not move. For example, when a specific gravity and high viscosity material such as gold-tin solder paste is filled, By falling into the space below the opening 21a, air enters from the tip opening 21a, or the inside of the material holding space 21 becomes negative pressure. As shown by the chain line in the figure, the void is in the material. May occur.

  However, in this syringe 10, the distal end opening 21 a is closed in contact with the closing surface 61 a of the closing cap 40, and there is no space communicating with the material holding space 21, so air is held in the held material. There is no mixing or formation of cavities in the material. Therefore, the syringe 10 filled with the material can be stored without causing a change in the material or a variation in the discharge amount at the time of the fixed discharge due to air mixing.

  In the case of a material having a large specific gravity and a high viscosity, leakage of the material can be effectively prevented by closing the tip opening 21a using the closing piece 60, but in the case of a material having a low viscosity, If there is a minute gap between the closing surface 61a and the tip opening 21a, the material may leak through the gap due to capillary action. In such a case, as shown in FIG. 6, if only the cap body 50 is attached to the cylindrical container 20 without using the closing piece 60, a space is formed between the tip opening 21 a and the cap body 50. Therefore, as shown by a chain line in the figure, the material is held without dripping due to the surface tension at the tip opening 21a.

As described above, according to the syringe of the present invention, it is possible to prevent leakage of the material during vertical storage and mixing of air into the material, so that the discharge amount at the time of quantitative discharge can be stabilized.
In addition, this invention is not limited to the thing of the structure of the said embodiment, In a detailed structure, it is possible to add a various change in the range which does not deviate from the meaning of this invention. For example, in the above-described embodiment, the cylindrical container and the closure cap are engaged with each other by providing two threads on the cylindrical container and the closure cap. Any structure may be used as long as the closure cap can be securely fixed to the cylindrical container and can be attached and detached, for example, by providing the closure cap with a protrusion-like locking piece that engages with the thread.

It is a fragmentary sectional view showing the syringe of the present invention. It is an exploded view which shows the principal part of the syringe shown in FIG. It is sectional drawing which shows the principal part of the syringe shown in FIG. It is a perspective view which shows the state which stores the syringe of this invention. It is sectional drawing which shows the leakage of a material in the case of hold | maintaining a material with large specific gravity without using a closing piece. It is sectional drawing which shows the case where a material with small specific gravity is hold | maintained without using a closing piece.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Syringe 20 Cylindrical container 21 Material holding space 21a End opening part 22 Inner cylinder part 23 Outer cylinder part 23a Thread (engaging structure part)
30 Plunger 40 Closing cap 50 Cap body 51 Hole 51a Bottom surface 51b Inner peripheral surface 52 Engaging portion 52a Thread (engaging structure portion)
60 Closing piece 61 Disk portion 61a Closing surface 62 Cylindrical portion A Adapter B Holder

Claims (2)

A cylindrical container that forms a cylindrical material holding space whose both ends are open, and is fitted to the inner surface of the cylindrical container so as to be able to advance and retreat, thereby closing the base end side of the material holding space and A plunger that varies the volume, and the plunger is advanced toward the nozzle member in a state in which the nozzle member connected to the tip opening of the material holding space is attached to the cylindrical container. A syringe that discharges the liquid held in the material holding space from the nozzle member,
The syringe includes a closing cap that is attached to the distal end of the cylindrical container instead of the nozzle member and closes the distal end side of the material holding space.
The closing cap is disposed between the bottom surface and the front end opening, and a cap body having a bottom surface facing the front end opening and having a hole into which the front end of the cylindrical container is inserted. A closing piece fitted into the hole of the cap body and having a closing surface abutting against the tip opening ;
The inner peripheral surface of the hole of the cap body is formed in a tapered shape,
The closing piece has the closing surface and is fitted to the inner peripheral surface of the hole, and a cylindrical portion that is provided continuously to the disc and has a smaller diameter than the disc portion. syringe and said Rukoto to have a.   The syringe according to claim 1, wherein the cylindrical container and the cap main body are provided with an engaging structure portion that is screwed together.

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