Piston pump

Abstract

To allow switching of a solvent to be transferred with a simple operation.SOLUTION: A piston pump includes: a piston shaft 103; a syringe 102 into which the piston shaft 103 is inserted; and a syringe holder 101 which includes an inflow port 122 connected to a liquid supply tube 19b and an inflow port 121 connected to a liquid supply tube 19a and into which the syringe 102 is inserted. When a solvent to be transferred is changed, another solvent can be transferred by washing only the piston shaft 103 that is inserted into the syringe 102 by changing the syringe 102.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a piston pump for pumping a solvent. [Background technology]

[0002] 2. Description of the Related Art Syringe pumps used in experiments using solvents such as chemical solutions are known.

[0003] Patent Document 1 discloses technology relating to a syringe pump that includes a housing-like main body, a syringe held in a holding part provided on the main body, a pressing body that presses the piston of the syringe in the axial direction, and a motor that drives the pressing body, and the holding part includes a syringe holder and a clamp. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-077848 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the syringe pump described in Patent Document 1, the syringe is held by a holding part, so when changing the sample to be delivered, it is necessary to remove the holding part, discharge the sample contained inside the syringe, and clean the inside of the syringe, which takes a considerable amount of time.

[0006] The present invention has been made in view of the above-mentioned problems, and has an object to provide a piston pump that allows switching of the solvent being pumped with a simple operation. [Means for solving the problem]

[0007] In order to achieve the above object, the piston pump according to the present invention is characterized by: a syringe with a piston inserted therein; a syringe holder having an inlet and an outlet connected to a liquid supply tube and into which the syringe is inserted; The reason is that it is equipped with the following. [Effects of the Invention]

[0008] According to the features of the piston pump of the present invention, the solvent to be pumped can be switched with a simple operation. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is an overall schematic view of a piston pump according to an embodiment of the present invention. [Figure 2] FIG. 2 is an exploded perspective view of a piston body included in the piston pump according to the embodiment of the present invention. [Figure 3] 1 is a cross-sectional view of a piston body included in a piston pump according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same or equivalent parts and components are designated by the same or equivalent reference numerals throughout the drawings. However, it should be noted that the drawings are schematic and may differ from the actual product. Furthermore, the drawings may include parts with different dimensional relationships and ratios.

[0011] Furthermore, the embodiments shown below are merely examples of devices that embody the technical concept of the present invention, and the technical concept of the present invention does not limit the arrangement of each component to that shown below. Various modifications can be made to the technical concept of the present invention within the scope of the claims.

[0012] Fig. 1 is a schematic overall view of a piston pump according to an embodiment of the present invention, Fig. 2 is an exploded perspective view of a piston body provided in the piston pump according to the embodiment of the present invention, and Fig. 3 is a cross-sectional view of the piston body provided in the piston pump according to the embodiment of the present invention. The front-rear, up-down, left-right directions shown in Fig. 1 will be referred to as front-rear, up-down, left-right directions in the following description.

[0013] A piston pump 1 according to an embodiment of the present invention is used to pump a solvent. The solvent to be pumped has an allowable viscosity range of 1 mPa·s to 2000 mPa·s, and is assumed to be propylene glycol monomethyl ether acetate containing an acrylic resin dissolved therein.

[0014] As shown in FIGS. 1 to 3, the piston includes a piston body 11, a slide shaft 12, and a main motor .

[0015] A slider crank mechanism 14 that converts the rotational motion of the main motor 13 into left and right reciprocating motion is provided in front of the main motor 13. A link movement adjustment screw 15 is provided near the slider crank mechanism 14, and by adjusting the link movement adjustment screw 15, the stroke amount of the reciprocating motion of the piston body 11 can be changed.

[0016] In addition, a home position sensor that detects the home position of the slider-crank mechanism 14 is provided above the slider-crank mechanism 14 .

[0017] The piston body 11 and the slide shaft 12 are connected by a piston joint screw 17. This allows the reciprocating motion converted by the slider crank mechanism 14 to be transmitted to the piston body 11 via the slide shaft 12.

[0018] One end of a liquid supply tube 19a is connected to the top of the tank 18 filled with the solvent. The other end of the liquid supply tube 19a is connected to an inlet 121 of the piston body 11. A check valve 20a is provided on the liquid supply tube 19a. As a result, the solvent in the tank 18 is supplied to the piston body 11 via the liquid supply tube 19a, but the check valve 20a prevents backflow toward the tank 18.

[0019] One end of a liquid supply tube 19b is connected to the outlet 122 of the piston body 11. A check valve 20b is provided on the liquid supply tube 19b. As a result, the solvent flowing out from the outlet 122 is sent from the piston body 11 via the liquid supply tube 19b, but the check valve 20b prevents the solvent from flowing back toward the piston body 11.

[0020] As shown in FIGS. 2 and 3, the piston body 11 includes a syringe holder 101, a syringe 102 inserted into the syringe holder 101, and a piston shaft 103 inserted into the syringe 102.

[0021] The left end of syringe holder 101 is provided with inlet 121 and outlet 122 described above, and the right end of syringe holder 101 is provided with screw bracket 104 .

[0022] An O-ring 105 is provided at the left-hand tip of syringe 102. An O-ring pressing plate 106 is provided at the right-hand rear end of syringe 102, and an O-ring 107 that is pressed by O-ring pressing plate 106 is provided on the left side of O-ring pressing plate 106.

[0023] When syringe 102 is inserted into syringe holder 101 and bolts 108 are used to fasten screw bracket 104 and O-ring retaining plate 106, O-ring 105 comes into contact with the inner wall of syringe holder 101 to form a tight seal.

[0024] As the slide shaft 12 reciprocates, the piston shaft 103 connected to the slide shaft 12 also reciprocates. At this time, a piston packing 109 is provided at the tip of the piston shaft 103 so as to push out the solvent inside the syringe 102.

[0025] When changing the solvent delivered by the piston pump 1 according to the embodiment of the present invention, it is necessary to avoid mixing of the solvents. Specifically, the tank 18 and the delivery tubes 19a and 19b are replaced with those for the new solvent.

[0026] Since syringe 102 is inserted into syringe holder 101, the solvent does not adhere to the inside of syringe holder 101. Therefore, by removing syringe 102 and piston shaft 103, replacing syringe 102, cleaning piston shaft 103, and then reassembling, it is possible to start delivering new solvent. Note that check valves 20a and 20b can be reused by cleaning them with syringe 102 and a solvent.

[0027] For example, the syringe 102 may be slightly pressed into the syringe holder 101, which has an outer diameter that is 0.1 mm smaller than the outer diameter of the syringe 102. This causes the piston packing 109 at the tip of the piston shaft 103 to be more crushed than usual, thereby reducing the amount of air bubbles that are generated when the piston is operated.

[0028] (Addendum) The present application discloses the following inventions.

[0029] (Appendix 1) a syringe with a piston inserted therein; a syringe holder having an inlet and an outlet connected to a liquid supply tube and into which the syringe is inserted; A piston pump comprising:

[0030] This allows for a simple change of solvent by simply replacing the syringe and washing only the piston shaft inserted into the syringe, since the syringe holder has an inlet and outlet connected to the liquid delivery tube and has a syringe holder with a syringe inserted inside. [Explanation of symbols]

[0031] 1 piston pump 11 Piston body 12 Slide shaft 13 Main motor 14 Slider crank mechanism 15 Link travel adjustment screw 17 Piston joint screw 18. Tank 19a Liquid transfer tube 19b Liquid transfer tube 20a check valve 20b Check valve 101 Syringe Holder 102 Syringe 103 Piston shaft 104 Screw bracket 105 O-ring Plate for 106 107 O-ring 108 volts 109 Piston packing 121 Inlet 122 Outlet

Claims

[Claim 1] a syringe with a piston inserted therein; a syringe holder having an inlet and an outlet connected to a liquid supply tube and into which the syringe is inserted; A piston pump comprising:

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