JPH0512671U - Syringe piston pump - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a syringe piston pump that is easy to disassemble without forming voids that cause generation of residual bubbles. [Structure] When the piston 11 is inserted into the syringe 10, O
The ring 21 contracts the groove bottom of the width groove 14 by elasticity,
The inner circumference of the bearing 12 is in close contact with the outer circumference of the piston to seal the liquid. A backup ring 22 is placed in the width groove to widen the groove width and to reduce the rigidity of the groove bottom by adjoining the inner diameter recessed groove 15 so that the elasticity of the O-ring can easily deform the inside. There is. The lip ring 16 acts as a scraper for a granular mixture such as an epoxy resin filler.
The lip ring 17 acts as a scraper for foreign matter from the outside, and the O-ring 19 presses the lip ring 17 against the piston. Since the flange portion 23 and the screw hole 24 are in contact with each other, it is possible to minimize the void portion. The pipe joint 25 is used to replenish the adhesive or remove air. The flange portion is formed thick and supports the O-ring 21 when the bearing is pulled out, which facilitates disassembly.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a syringe piston pump that discharges medium and high viscosity liquids such as adhesives and chemicals.

[0002]

[Prior Art]

 The following functions are required in a syringe piston pump that fills the inside of a syringe like a syringe with adhesive and pushes the piston to discharge the adhesive from the discharge nozzle at the end of the syringe. No bubbles remain inside when filling the adhesive. Easy to disassemble and assemble as it requires cleaning. Resistant to solvent in adhesive or cleaning solvent. High accuracy can be secured. A typical example of a conventional syringe piston pump is shown in FIG. Air bubbles remain in the void 2 of the U packing 1, the annular void 4 between the air bleeding port 3 and the U packing 1, the void 8 formed by the tip luer taper 6 of the syringe 5 and the nozzle body 7, and the like. Due to the contraction and expansion of the residual air bubbles, the disconnection of the discharge deteriorates and accuracy cannot be ensured. At the time of disassembly, the piston bearing 9 is pulled out from the syringe, and then the U packing 1 is pulled out, but it is difficult to pull out because there is no place to hook it. Especially when the adhesive is gelled, it sticks and cannot be decomposed.

[0003]

[Problems to be solved by the device]

 (EN) Provided is a syringe piston which is easy to disassemble and assemble without forming voids that are a pool of residual bubbles.

[0004]

[Means for Solving the Problems]

 A wide groove is engraved on the outer circumference of one end of a synthetic resin piston bearing with good solvent resistance, an O-ring is installed on the back side, and then a backup ring is attached. To provide. A nozzle insertion hole is provided on the discharge side of the syringe tip, the inlet part is formed in a cone shape, an O ring is attached, a male screw is engraved on the outer peripheral part, and the O ring is pressed by the inner end surface of the mating nut ..

[0005]

[Work]

 The piston bearing bears the piston with an inner diameter, and the wide groove bottom part contracts inward by the elasticity of the O-ring and tightly adheres to the outer circumference of the piston to seal the liquid. When disassembling, simply pull out the piston bearing and the seals such as O-ring can be pulled out at the same time. Insert the nozzle into the nozzle insertion hole and tighten the nut to secure the O-ring by tightening the nozzle.

[0006]

First Embodiment In a syringe pump in which a piston 11 is inserted into a syringe 10, a synthetic resin bearing 12 is installed at the piston insertion side end of the syringe, and fixed with screws 13 to prevent it from coming off. A wide groove 14 is formed on the left end of the bearing 12 while leaving the groove bottom wall thickness thin. Adjacent to the wide groove 14, an inner diameter recessed groove 15 is engraved. Lip rings 16 and 17 are integrally formed on the inner diameter edges of the left and right end surfaces of the bearing 12. An O-ring groove 18 is engraved on the outer circumference of the lip ring 17 on the right end face, and an O-ring 19 is inserted. A withdrawal groove 20 is formed on the outer circumference of the bearing 12 protruding from the end surface of the syringe 10. An O-ring 21 and a back-up ring 22 are fitted in the wide groove 14. A screw hole 24 is formed in the body of the syringe 10 so as to contact the flange portion 23 at the left end of the bearing 12, and a pipe joint 25 is screwed in. A nozzle insertion hole 26 is provided at the left end of the syringe 10, and its inlet portion is formed into a cone shape to form an O-ring groove 27, and an O-ring 28 is attached. A male screw 29 is engraved on the outer peripheral portion of the syringe 10 and a nut 30 is fitted thereto. When the piston 11 is inserted into the syringe 10, the O-ring 21 elastically contracts the groove bottom of the wide groove 14, and the inner circumference of the bearing 12 comes into close contact with the outer circumference of the piston 11 to seal the liquid. By inserting a backup ring 22 into the wide groove 14 to widen the groove width and adjoining the inner diameter recessed groove 15 to weaken the rigidity of the groove bottom, the O-ring 21 easily deforms inward. Like that. The lip ring 16 acts as a scraper for the granular mixture of epoxy resin filler and the like. The lip ring 17 acts as a scraper for foreign matter from the outside, and the O-ring 19 presses the lip ring 17 against the piston 11. Since the flange portion 23 and the screw hole 24 are in contact with each other, it is possible to minimize the void portion. Adhesive is replenished or air is removed from the pipe joint 25. When the nozzle 31 is inserted into the nozzle insertion hole 26 and the nut 30 is tightened, the O-ring 28 firmly holds the nozzle 31 and prevents liquid leakage from the inside. The O-ring 21 can be disassembled by pulling the bearing 12 by hooking the claw of the pulling tool in the pulling groove 20. The flange portion 23 is formed thick and supports the O-ring 21 when the bearing 12 is pulled out, which facilitates disassembly.

[0007]

[Effect of the device]

 Bubbles cannot be formed because voids that cause bubbles are not formed. Easy to disassemble and assemble. O-ring material is perfluoroelastomer and bearing material is fluorine resin, and solvent resistance is good. Since the piston 11 slides on the fluorine resin of the bearing material, stick lips do not occur. It is possible to secure minute feed with high accuracy.

[0008]

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a conventional syringe piston pump.

FIG. 2 is a cross-sectional view of the syringe piston pump of the present invention.

[Explanation of Codes] 10. Syringe 11. Piston 12. Bearing 13.
Screw 14. Wide groove 15. Inner bore groove 16. Lip ring 17. Lip ring 18. O-ring groove 19. O-ring 20. Pull-out groove 21. O-ring 22. Backup ring 23. Flange portion 24. Screw hole 25. Pipe joint 2
6. Nozzle insertion hole 27. O-ring groove 28. O-ring 29. Male 30. Nut 31. nozzle

Claims (1)

[Scope of utility model registration request] 1. A syringe piston pump comprising a piston bearing having a thin groove bottom and a wide groove engraved on the outer periphery of the rear end and having an O-ring, and a piston and a syringe.