WO2000047894A1 - Dispositif d'aspiration et d'evacuation de liquide trace - Google Patents

Dispositif d'aspiration et d'evacuation de liquide trace Download PDF

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Publication number
WO2000047894A1
WO2000047894A1 PCT/JP2000/000727 JP0000727W WO0047894A1 WO 2000047894 A1 WO2000047894 A1 WO 2000047894A1 JP 0000727 W JP0000727 W JP 0000727W WO 0047894 A1 WO0047894 A1 WO 0047894A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid
plunger
motor
rotation
cylinder
Prior art date
Application number
PCT/JP2000/000727
Other languages
English (en)
Japanese (ja)
Inventor
Kazutomi Yokota
Original Assignee
Kazutomi Yokota
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kazutomi Yokota filed Critical Kazutomi Yokota
Publication of WO2000047894A1 publication Critical patent/WO2000047894A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical

Definitions

  • the present invention relates to a quantitative inhalation and discharge device used when transferring a small amount of liquid.
  • the present invention relates to a high-precision, high-reliability, inexpensive fixed-quantity suction / discharge device for accurately dispensing liquids such as water and chemical liquids in an automatic analyzer.
  • a reciprocating movement of a plunger for the liquid suction / discharge device is performed by utilizing a linear movement of a belt between a bull and a pulley using a pulley and a belt. It is known to cause.
  • the conventional rotation-linear conversion mechanism uses a mechanism that interacts with each other in a complicated manner, such as a cup ring and a ball bearing, so that the number of parts is large, and the assembly is complicated and large. was there.
  • this conventional mechanism backlash inevitably occurs, resulting in a decrease in quantitative accuracy. Noh problems also occurred.
  • the conventional mechanism there has been a strong demand for downsizing, a reduction in the number of parts, and an improvement in weighing accuracy associated with the mechanism for converting from rotary motion to linear motion.
  • the present invention has been proposed in view of the above circumstances. That is, in order to solve the above-mentioned problem, the present invention incorporates a mechanism having a reciprocating shaft that is coaxial with a motor output shaft, i.e., a rotor, and that performs only reciprocating motion into a constant-rate suction / discharge device. It consists of.
  • the object of the present invention is to provide a motor which receives an input signal corresponding to the amount of liquid to be sucked or discharged and generates rotation corresponding to the input signal;
  • a plunger substantially coaxial with the reciprocating shaft and integrally attached to the reciprocating shaft at one end of the reciprocating shaft;
  • a liquid circulation nozzle provided on the side of the cylinder opposite to the plunger of the liquid chamber; and a liquid circulation nozzle connected to the cylinder at a front side of the liquid circulation nozzle.
  • a liquid flow pipe communicating with the liquid, and an opening provided at the tip of the liquid flow pipe for discharging or sucking the liquid.
  • the liquid amount corresponding to the rotation of the motor can be achieved by a liquid suction / discharge device configured to discharge or suck in accordance with the rotation direction of the motor.
  • the outer screw of the reciprocating shaft is reciprocated by screwing with an inner screw provided on the rotor of the motor.
  • a predetermined filling liquid is filled from the liquid chamber of the cylinder to the inside of the liquid flow pipe, and at least the liquid is sucked and discharged through the port at the time of suction operation.
  • the inside of the chamber has a t ⁇ structure in which the target liquid does not flow. More preferably, the output shaft of the motor performs rotation according to the number of input pulses.
  • a movement sensor for detecting movement of the reciprocating shaft in the axial direction is provided.
  • a hash and a packing for sealing the liquid chamber are provided at a contact portion with the plunger at an end of the liquid chamber opposite to the nozzle.
  • a rotating member that rotates by a predetermined amount in a predetermined direction corresponding to an amount of liquid to be sucked or discharged, and a through hole formed in a central portion and extending in a rotation axis direction.
  • a rotating member having an internal screw formed on the inner surface of the
  • An outer screw threaded through the through-hole of the rotating member, and formed with an outer screw to be fitted with an inner screw of the rotating member, and reciprocating in accordance with the rotation of the rotating member is itself.
  • a plunger at one end of the reciprocating shaft substantially coaxially with the reciprocating shaft, and integrally attached to the reciprocating shaft;
  • a liquid circulation nozzle provided on the side of the cylinder opposite to the plunger of the liquid chamber
  • a liquid flow pipe connected to the cylinder on the front side of the liquid flow nozzle and communicating with the liquid in the liquid chamber of the cylinder via the nozzle; and a liquid flow pipe provided at a tip end of the liquid flow pipe; Mouth for discharging or inhaling liquid
  • a liquid suction and discharge device which discharges or sucks a liquid amount according to the rotation of the rotating member according to the rotation direction of the rotating member.
  • the reciprocating shaft and the plunger are in a body.
  • the rotating shaft of the motor and the plunger it is not always necessary to directly connect the rotating shaft of the motor and the plunger, and the rotating body is provided outside and the plunger is provided inside. What is necessary is just to comprise the reciprocating shaft directly connected.
  • a screw is necessarily cut inside the motor rotor body, and this is screwed to the outer screw of the reciprocating shaft. There is no need to combine.
  • a feature of the present invention is to provide a liquid suction / discharge device that requires precise quantitative processing by providing a mechanism in which a rotor is provided outside and a motor shaft performs only linear motion without rotating motion.
  • a motor having an axis that travels straight without rotating according to the number of pulses input is used, and a simple structure is used to directly connect this motor axis to the plunger, and the number of parts is reduced. And the efficiency of assembly can be reduced. This can further reduce the size and improve the reliability of the liquid quantitative processing.
  • FIG. 1 is an overall configuration diagram of a fixed-quantity suction / discharge device of the present invention.
  • FIG. 2 is a partial cross-sectional view of the constant-rate suction / discharge device according to the present invention.
  • FIG. 3 is a cross section of a motor used in the present invention.
  • FIG. 1 shows an overall schematic diagram of a micro-liquid inlet / outlet device 1 according to the present invention.
  • a liquid suction / discharge device 1 includes a cylinder device 2 having a reciprocating plunger 3, a liquid flow tube 4 connected to the cylinder device 2 and filled with liquid therein, and a tip of the liquid flow tube 4.
  • a suction / discharge unit 5 is provided in the unit for sucking and discharging the liquid.
  • a rotating body drive source 7 (in this example, a motor) having a rotating body 6 that performs a rotating operation corresponding to a predetermined processing liquid amount for causing the plunger 3 of the cylinder device 2 to reciprocate is provided. .
  • An electronic control unit 8 which preferably includes a microcomputer, outputs a drive signal for giving a predetermined rotation of the rotating body 6.
  • the electronic control unit 8 of the present embodiment outputs a predetermined control signal according to the content of the processing and the amount of liquid to be processed. That is, the control device 8 outputs a control signal of the rotating body for controlling the position of the suction / discharge unit 5 and controlling the reciprocation of the plunger 3 of the cylinder device 2.
  • the rotating body drive source of this example is composed of a motor 7, and the rotor of the motor 7 constitutes the rotating body 6.
  • the cylinder device 2 and the rotating body drive source 7 are fixed on the base plate 10 via bolts 9.
  • the plunger 3 of the cylinder device 2 rotates the rotating body drive source 7 (motor).
  • Shafts (motor shafts) 11 They are integrally connected to form a common shaft.
  • the cylinder device 2 includes a cylinder body 12 and a plunger 3 slidably disposed in a cylinder bore 13 provided in the cylinder body.
  • a seal member 16 having an O-ring 15 and a spacer 17 are arranged on a step portion of a middle diameter portion 14 extending from an end of the cylinder bore 13 on the plunger base side.
  • the cylinder body 1 2 extends further from the middle diameter section 14 to the base end side of the plunger 3
  • the spacer 17 has a large diameter portion 18 having a screw, and the spacer 17 is provided with a seal holding screw 19 screwed to the large diameter portion 18 of the cylinder body 12 with respect to the surface of the stepped portion. It is imposed. Even if the plunger 3 moves within the cylinder bore 13 due to this sealing mechanism, the amount of fluid sucked and discharged from the connection hole 20 is not proportional to the stroke moved by the plunger 3 without sucking and discharging the outside air. Will be.
  • the cylinder bore 13 defines a liquid chamber 22 between the front end face 21 of the plunger 3 and a small-diameter nozzle 23 formed on the opposite side of the liquid chamber 22 from the plunger 3. You.
  • the liquid flow pipe 4 is connected to the front end side of the nozzle 23 via the connection hole 20.
  • the volume of the liquid chamber 22 changes according to the stroke of the plunger 3, and the liquid inside flows through the nozzle 23. In the apparatus to which the present invention is applied, it is required that the stroke of the plunger 3 accurately correspond to the flow rate of the liquid to the liquid chamber 22 via the nozzle 23. It has a liquid-tight structure to withstand this requirement.
  • the S3 ⁇ 4 portion of the plunger 3 is integrally fixed to the non-rotating reciprocating motor shaft 11 of the motor 7 by a fixing screw 25, and the entire end face 21 of the plunger 3 is Move in the cylinder bore 13 by the reciprocating motion of the motor shaft 11.
  • this movement causes the fluid to be more discharged to the bow through the connection hole 14 of the liquid flow pipe 4 at the top of the cylinder.
  • the light-blocking pin 24 is attached to the plunger 3.
  • the light shielding pin 24 extends in a direction perpendicular to the axial direction of the plunger 3.
  • the position sensor 26 is mounted on the base plate 10. In this case, the position sensor 26 is attached via a support 10a, a lug 10Ob, and a support 10c integrated with the base plate 10. When the light from the light emitting device of the position sensor 26 is blocked by the light-shielding pin 24 and does not reach the light receiving device of the sensor 26, the position indicates the position of the plunger 3 in the predetermined axial direction. Will be.
  • the above position sensor 26 is the axis of this plunger 3. A signal indicating the position in the direction is generated in the control device 8.
  • FIG. 3 shows a cross section of a motor in which the shaft 11 reciprocates without rotating.
  • the motor 7 in this example includes a rotor 27 having an internal thread, that is, an internal thread, and the rotor is supported by bearings 28.
  • the externally threaded motor shaft 11 is screwed with a rotating body having a female thread, and the rotating body reciprocates without rotating itself.
  • the rotor 27 is configured to rotate by a magnetic force acting on the stator 29, and when pulse power is applied to the motor 7 in this example, the rotor 27 rotates by a rotation angle corresponding to the number of pulses. That is, reciprocation corresponding to the power supplied to the unit 7 is performed.
  • the control of the rotation direction of the motor 7 can be controlled by a known method, and does not constitute a feature of the present invention.
  • a pump was constructed by combining the suction / discharge device according to the present invention with a full stroke of 300 microliters with a three-way solenoid valve, and an experiment was conducted in which water at atmospheric pressure was fed into a pressurized tank at 1 atm.
  • the motor rotor was rotated. Although it is used as a body, an internal screw is cut inside the rotating body and a motor shaft that is screwed with this is provided.
  • the present invention which has the above-described configuration, provides a fixed-quantity suction / discharge device with a small number of parts, a simple structure, high precision, high reliability, and low cost.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Abstract

L'invention concerne un dispositif d'aspiration et d'évacuation de volume constant, qui peut être utilisé dans un dispositif distributeur et dans un analyseur automatique, possède une structure simple, comporte peu d'éléments, présente une fiabilité et une précision élevées et un faible coût. Le dispositif comporte un moteur pourvu d'un arbre de moteur effectuant un mouvement alternatif sans rotation en fonction d'un nombre d'impulsions introduit, un piston fixé à l'arbre du moteur et animé d'un mouvement alternatif, et un capteur combiné à un cylindre fixé à une plaque de base pour détecter la position de référence du piston.
PCT/JP2000/000727 1999-02-15 2000-02-10 Dispositif d'aspiration et d'evacuation de liquide trace WO2000047894A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP7423499 1999-02-15
JP11/74234 1999-02-15

Publications (1)

Publication Number Publication Date
WO2000047894A1 true WO2000047894A1 (fr) 2000-08-17

Family

ID=13541285

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2000/000727 WO2000047894A1 (fr) 1999-02-15 2000-02-10 Dispositif d'aspiration et d'evacuation de liquide trace

Country Status (1)

Country Link
WO (1) WO2000047894A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007083354A (ja) * 2005-09-22 2007-04-05 Seiwa Seiki:Kk ワーク吸着保持装置
WO2008009797A2 (fr) * 2006-07-18 2008-01-24 Pulssar Technologies Unité de pompage a durée de vie élevée

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01156276A (ja) * 1987-12-11 1989-06-19 Hitachi Ltd 紙葉類収納機構
JPH0387976U (fr) * 1989-12-26 1991-09-09
JPH0712048A (ja) * 1993-06-29 1995-01-17 Kachiku Kairiyou Jigyodan 流体の吸引排出装置
JPH0788738A (ja) * 1993-09-20 1995-04-04 Fanuc Ltd テーブル交換式機械加工システム
JPH1095345A (ja) * 1996-09-10 1998-04-14 Ampa Fr Sa ベビーカーに支持体を取り付ける装置および該装置が設けられたベビーカーおよび支持体

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01156276A (ja) * 1987-12-11 1989-06-19 Hitachi Ltd 紙葉類収納機構
JPH0387976U (fr) * 1989-12-26 1991-09-09
JPH0712048A (ja) * 1993-06-29 1995-01-17 Kachiku Kairiyou Jigyodan 流体の吸引排出装置
JPH0788738A (ja) * 1993-09-20 1995-04-04 Fanuc Ltd テーブル交換式機械加工システム
JPH1095345A (ja) * 1996-09-10 1998-04-14 Ampa Fr Sa ベビーカーに支持体を取り付ける装置および該装置が設けられたベビーカーおよび支持体

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007083354A (ja) * 2005-09-22 2007-04-05 Seiwa Seiki:Kk ワーク吸着保持装置
WO2008009797A2 (fr) * 2006-07-18 2008-01-24 Pulssar Technologies Unité de pompage a durée de vie élevée
FR2904066A1 (fr) * 2006-07-18 2008-01-25 Pulssar Technologies Sarl Unite de pompage a duree de vie elevee.
WO2008009797A3 (fr) * 2006-07-18 2008-03-06 Pulssar Technologies Unité de pompage a durée de vie élevée
US8337174B2 (en) 2006-07-18 2012-12-25 Pulssar Technologies Long-life pump unit with a linear actuating module

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