JP2009275581A - Plunger pump, and dispensing device and specimen inspection device using plunger pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plunger pump enhancing sealability and extending service life, and to provide a dispensing device and a specimen inspection device using the plunger pump. <P>SOLUTION: This plunger pump 10 includes a piston 14 reciprocatingly inserted into a pump head 13, and a drive section 15 for reciprocating the piston 14. A partitioning wall portion 24 partitioning the inside of the pump head 13 from the side of the drive section 15 and elongating and contracting along the reciprocating motion of the piston 14 is laid between the piston 14 and the pump head 13. By the partitioning wall portion 24, it is possible to solve the problem of abrasion of a sealant caused by the sliding of the piston and to extend the service life. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a plunger pump that sucks and discharges fluid, and a dispensing apparatus and a specimen testing apparatus using the plunger pump.

Conventionally, some plunger pumps are configured to feed liquid by reciprocating a piston in a pump head (see, for example, Patent Document 1).
In the plunger pump described in Patent Document 1, the plunger (piston) is given a piston motion by a drive source and reciprocates in the pump chamber in the pump head while sliding with two plunger seals. In this case, the volume of the pump chamber is changed by the reciprocating movement of the piston, so that a pump action occurs, and the suction of the fluid into the pump head and the discharge of the fluid out of the pump head are performed. Moreover, in this plunger pump, in order to improve the wear resistance of the seal in the sliding portion, a material in which carbon is mixed in a fiber shape (fiber shape) into PTFE as a base material is used as a material of the plunger seal.
Japanese Patent Laid-Open No. 11-152571

  The plunger seal serves to seal the liquid in the pump chamber, but does not completely stop the liquid for the purpose of lubrication with the piston. That is, in the plunger pump of Patent Document 1, some of the liquid in the pump chamber leaks behind the seal (that is, outside the pump chamber) so as to wet the surface of the piston. In addition, the plunger seal using the above-mentioned material can improve the wear resistance. However, since the piston slides on the inner periphery of the plunger seal, the wear is unavoidable, and the sealing performance is lowered and the liquid is deteriorated. A situation that could lead to the outflow of

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a plunger pump capable of enhancing the sealing performance and extending the life, a dispensing device using the plunger pump, and a specimen testing device. .

  In order to achieve the above object, a plunger pump according to claim 1 of the present invention is inserted into a pump head and a reciprocating motion in the pump head so as to change a volume in the pump head by the reciprocating motion. Thus, a piston that sucks fluid into the pump head and discharges fluid outside the pump head, a drive unit for reciprocating the piston, and a span between the piston and the pump head. And a partition wall that partitions the pump head inside and the drive section and expands and contracts along the reciprocating motion of the piston.

  The invention of claim 6 is a dispensing device for transferring a liquid from a liquid container to another container using the plunger pump, wherein the plunger pump has a nozzle in the pump head, and the piston is driven by the drive unit. Is driven, the liquid in the liquid container is sucked from the nozzle into the pump head, and the liquid is discharged from the nozzle to the another container.

  The invention of claim 7 is a sample testing device for analyzing a sample by transferring a sample and a reagent using the plunger pump and reacting the sample and the reagent, wherein the sample and the reagent are a plurality of liquids. Each of the plunger pumps has a nozzle in the pump head, and the piston is driven by the drive unit so that the specimen or reagent in the liquid storage container is transferred from the nozzle into the pump head. It is configured to suck and discharge the sucked specimen or reagent from the nozzle to the reaction container.

  According to the plunger pump of the first aspect, the partition portion that expands and contracts along the reciprocation of the piston separates the inner side of the pump head from the drive portion side, so that the piston slides like a conventional plunger seal (packing). The part can be made unnecessary. In this way, the partition wall does not have a problem of wear of the sealing material due to the sliding of the piston, and it is not necessary to consider lubrication with the piston, so that the sealing performance can be maintained without causing fluid to leak. , Can extend the life.

  According to the dispensing apparatus of the sixth aspect, since the abrasion powder of the sealing material does not enter the fluid in the pump head, there is no problem of contaminating the fluid discharged to another container. Moreover, since the lifetime of the partition part as a sealing material can be aimed at, the maintenance expense of the whole dispensing apparatus can be suppressed. Furthermore, since the liquid can be prevented from flowing out by the partition wall, and the liquid can be stably sucked and discharged, the accuracy of dispensing can be improved.

  According to the sample test apparatus of claim 7, there is no problem that the sample or reagent discharged to the reaction container is contaminated by the abrasion powder of the sealing material, and the liquid can be prevented from flowing out by the partition wall, so that the measurement accuracy can be achieved. And highly reliable sampling. Furthermore, since the life of the partition wall can be extended, the maintenance cost of the entire specimen testing apparatus can be suppressed.

<First embodiment>
Hereinafter, a first embodiment in which the present invention is applied to a dispensing apparatus will be described with reference to FIGS. FIG. 1 schematically shows a dispensing device, which is configured to transfer a fluid (liquid) from a plurality (for example, two) of liquid storage containers to another container by a plunger pump. That is, as shown in the figure, the dispensing apparatus uses the first liquid 1a accommodated in the first container 1 which is a liquid container and the second liquid 2a accommodated in the second container 2 as separate containers. A plunger pump 10 configured to dispense into the mixing container 3 and capable of sucking and discharging these liquids, and a moving device (moving means) 11 for moving the plunger pump 10 horizontally and vertically are provided. ing.

  Here, FIG. 2 is a schematic perspective view of the plunger pump 10, and FIG. The plunger pump 10 includes a pump head 13 having a nozzle 12, a piston 14 inserted into the pump head 13 so as to freely reciprocate, and a drive unit 15 for causing the piston 14 to reciprocate.

The pump head 13 has a substantially cylindrical shape, and a pump chamber 13a for containing a liquid is formed therein. The pump head 13 is integrally provided with a pipe-shaped nozzle 12 having a relatively small diameter that protrudes toward the tip side (left side in FIG. 2). The nozzle 12 functions as a suction port for sucking liquid into the pump chamber 13a and a discharge port for discharging liquid out of the pump chamber 13a. A housing 16 is provided on the base end side of the pump head 13 so as to continue to the pump head 13.
The drive unit 15 includes, for example, a motor 17 formed of a stepping motor, and an orthogonal conversion mechanism 18 as a transmission mechanism that converts the rotational motion of the motor 17 into a reciprocating motion (linear motion) of the piston 14 and transmits it.

Although not shown in detail, the orthogonal transformation mechanism 18 is composed of, for example, a ball screw accommodated in the housing 16. The ball screw is opposed to the screw shaft portion 19 having a ball screw groove 19 a (refer to FIG. 3 hereinafter) formed on the outer peripheral surface of the tip portion of the rotating shaft 17 a of the motor 17 and the outer peripheral surface of the screw shaft portion 19. A nut 20 having a ball screw groove 20a on the inner peripheral surface, and a number of balls (not shown) disposed between the nut 20 and both ball screw grooves 19a, 20a of the screw shaft portion 19 are provided. Although the ball screw groove 19a is provided at the tip of the rotating shaft 17a of the motor 17, the rotating shaft 17a and the screw shaft portion 19 may be separate members. Further, the orthogonal transformation mechanism 18 only needs to convert the rotational motion of the motor 17 into the linear motion of the piston 14 and transmit it. The orthogonal transformation mechanism 18 may be changed as appropriate, such as using a lead screw connected to the rotational shaft 17a. Guide portions 16a and 16a (shown only in FIG. 2) extending in the axial direction are provided inside the housing 16, and the nut 20 is axially moved by the guide portions 16a and 16a at the flange portion 20b at the rear end. It is supported so as to be movable. Here, when the rotation shaft 17a (screw shaft portion 19) rotates due to the normal rotation of the motor 17, the orthogonal transformation mechanism 18 moves the nut 20 and the piston 14 integrally provided at the tip portion along the axial direction. When the screw shaft portion 19 is rotated by the reverse rotation of the motor 17, the forward path is moved (moved to the right in FIG. 3), the nut 20 and the piston 14 are moved along the axial direction in the return path (left in FIG. 3). Move it towards).

  As shown in detail in FIG. 3, the piston 14 includes a piston rod 21 that extends in the axial direction from the distal end portion of the nut 20, and a piston main body 22 provided at the distal end portion of the rod 21. The piston main body 22 has a cylindrical shape that is set to have a diameter larger than that of the piston rod 21 and slightly smaller than that of the pump chamber 13a. The piston main body 22 (piston 14) is inserted into the pump chamber 13a, and is moved reciprocally in the axial direction by the driving unit 15 in a non-contact state with the inner peripheral surface of the pump head 13. Here, FIG. 4 shows a perspective view from the base end side of the piston main body 22. On the base end surface of the piston main body 22, a rod fitting portion 23 a and a partition fitting portion 23 b are arranged in the axial direction. It is provided so as to be recessed inward. The rod fitting portion 23 a is configured such that the piston body 22 is fitted and held with respect to the piston rod 21 by fitting the distal end portion of the piston rod 21. The partition fitting portion 23b is formed in a groove shape concentric with the rod fitting portion 23a on the outer peripheral side, and an end portion of a partition wall portion 24 to be described later is fitted therein.

  A hole 25a (see FIG. 6) is formed in the wall portion 25 on the distal end side of the housing 16 so as to be positioned at the center and through which the piston rod 21 passes. On the other hand, a partition wall step 26 (see FIG. 6) is provided around the pump chamber 13 a at the base end of the pump head 13, and the other end of the partition wall 24 is provided in the partition wall step 26. Is arranged.

  FIG. 5 is an enlarged cross-sectional view of the partition wall 24. As shown in the figure, the partition wall 24 has a cylindrical bellows (so-called bellows) -shaped bellows portion 24a and flanges provided at both ends thereof. Parts 24b and 24c. The partition wall portion 24 is made of a flexible material such as nitrile rubber (NBR), and the bellows portion 24a and the flange portions 24b and 24c are integrally formed by injection molding. One of the flange portions 24b is formed in a cylindrical shape, and is caulked from the outside at the base end portion of the piston body 22 in a state where the flange portion 24b is inserted and fitted into the fitting portion 23b for the partition wall of the piston body 22. It will be crushed. By this caulking, the flange portion 24b is secured from the piston main body 22, and watertightness and airtightness are secured over the entire circumference of the flange portion 24b.

  The other flange portion 24c has a hollow disk shape projecting radially outward, and is sandwiched between the base end portion of the pump head 13 and the wall portion 25 on the distal end side of the housing 16 in the partition wall step portion 26. By being fixed, watertightness and airtightness are secured over the entire circumference. Further, the partition wall 24 is provided so as to be spanned between the piston main body 22 and the pump head 13, and partitions the inner side of the pump head 13 from the drive unit 15 (housing 16 side) and the piston. The main body 22 expands and contracts along the reciprocating motion.

  The control circuit 28 of the dispensing apparatus shown in FIG. 1 is mainly composed of a microcomputer, and has a CPU, a ROM, a RAM (all not shown) and the like. Connected to the control circuit 28 are driving circuits 29 and 30 for driving the moving device 11 and the stepping motor 17, respectively. The ROM of the control circuit 28 stores a series of dispensing programs and the like for transferring the first liquid 1a and the second liquid 2a. The control circuit 28 moves the moving device 11, the stepping motor 17 and the like according to the programs. Is to control.

  Next, the operation of the dispensing device of this embodiment will be described with reference to FIG. Here, FIGS. 6A and 6B are views for explaining the operation of the plunger pump 10 at the time of discharge and suction, and are sectional views showing an enlarged portion near the pump chamber 13a. The plunger pump 10 is moved horizontally and vertically by the moving device 11.

  First, the plunger pump 10 moves upward above the first container 1 and descends so that the nozzle 12 is immersed in the first liquid 1 a in the first container 1. In this state, when the motor 17 is rotated forward, the piston 14 moves in the forward path via the orthogonal conversion mechanism 18 (that is, moves in the direction of expanding the volume of the pump chamber 13a), so that the first container 1 in the first container 1 is moved. The liquid 1a is sucked into the pump chamber 13a from the nozzle 12. In this case, the bellows portion 24a of the partition wall portion 24 is folded as the piston main body 22 moves from the distal end portion side (see FIG. 6A) to the proximal end portion side (see FIG. 6B). Shrink. Further, in the pump chamber 13 a, even if the first liquid 1 a is filled in the space S on the right side (right side in FIG. 6) from the piston body 22, the first liquid 1 a is sealed by the partition wall portion 24.

  When a predetermined amount of the first liquid 1a is sucked into the pump chamber 13a and the motor 17 is stopped, the plunger pump 10 rises and moves above the second container 2 so that the nozzle 12 is moved into the second container 2 in the second container 2. It descends so that it may be immersed in 2 liquid 2a. In this state, when the motor 17 is rotated forward again, the piston 14 moves in the forward path via the orthogonal transformation mechanism 18, and the second liquid 2a in the second container 2 is sucked from the nozzle 12 into the pump chamber 13a. Is done. In this case, as the piston body 22 moves, the bellows portion 24a of the partition wall portion 24 is further contracted and is compactly folded in the pump chamber 13a.

  When a predetermined amount of the second liquid 2a is sucked into the pump chamber 13a and the motor 17 is stopped, the plunger pump 10 rises and separates from the second container 2, and then moves upward above the mixing container 3 and descends. . In this state, when the motor 17 is rotated in the reverse direction, the piston 14 moves in the return path via the orthogonal transformation mechanism 18 (that is, moves in the direction of narrowing the volume of the pump chamber 13a), whereby both liquids 1a, 2a is discharged from the nozzle 12 to the mixing container 3 side. At this time, as the piston main body 22 moves to the left in FIG. 6, the bellows portion 24a extends as shown in FIG. And the plunger pump 10 complete | finishes the discharge, when the motor 17 is stopped. In the dispensing apparatus of the present embodiment, the above-described series of operations is set as one cycle, and the plunger pump 10 can continuously perform dispensing and mixing a plurality of times. Further, according to the above configuration, it is possible to transfer three or more kinds (third liquid) or more of liquids, and the liquids are continuously sucked and transferred from a large number of liquid storage containers (not shown). Although the transfer can be performed separately for each liquid, illustration and detailed description are omitted.

  As described above, in this embodiment, the partition wall portion 24 is provided so as to be spanned between the piston 14 and the pump head 13, partitions the pump head 13 inside and the drive portion 15 side, and reciprocates the piston 14. It was configured to expand and contract along. According to the partition wall 24, a sliding portion with respect to the piston such as a conventional plunger seal (packing) is not required, but the inner side of the pump head 13 is separated from the driving portion 15 side. The problem of wear of the material can be solved. Further, unlike the conventional plunger seal, it is not necessary to consider the lubrication in the sliding portion of the seal material, so that the sealing performance can be maintained without causing the fluid to leak and the life can be extended.

  Further, the partition wall 24 is made of a flexible material and is formed in a cylindrical bellows shape that is folded by the movement of the piston 14, so that the partition wall 24 is expanded and contracted along the reciprocating motion of the piston 14 with a relatively simple configuration. be able to. In addition, the bellows part 24a can be compactly folded in the pump chamber 13a during suction, and the bellows part 24a can be sufficiently expanded during discharge, so that the stroke of the piston 14 and thus the liquid supply amount can be sufficiently secured.

  The flange portions 24 b and 24 c are provided at both ends of the partition wall portion 24, and one flange portion 24 b of the flange portions 24 b and 24 c is fixed to the piston 14, and the other flange portion 24 c is connected to the driving portion 15 side of the pump head 13. It was fixed to the end. According to this, it is possible to attach and fix the partition wall 24 over the piston 14 and the end of the pump head 13 by using the flange portions 24b and 24c, and to ensure a sufficient capacity in the pump head 13 while sealing. Can be obtained.

  The plunger pump 10 includes a housing 16 that houses a part of the drive unit 15 and that is connected to the pump head 13, and is crimped in a state in which one flange portion 24 b is fitted to a fitting portion provided in the piston 14. The other flange 24c was fixed so as to be sandwiched between the pump head 13 and the housing 16. According to this, the partition wall portion 24 can be reliably fixed to the plunger pump 10 with a relatively simple configuration, and the sealing performance at the respective flange portions 24b and 24c can be enhanced as much as possible, from the pump chamber 13a. Liquid leakage to the drive unit 15 side can be prevented as much as possible.

  Since the drive unit 15 is composed of the stepping motor 17 and the orthogonal conversion mechanism 18 that converts the rotational motion of the motor 17 into the reciprocating motion of the piston 14 and transmits it, accurate positioning control of the piston 14 with a relatively simple configuration. The liquid can be sucked and discharged with high accuracy and stability.

  In the dispensing apparatus of the present embodiment, liquid can be prevented from leaking out by the partition wall portion 24, and suction and discharge of the liquid can be performed stably, so that the dispensing accuracy can be improved. Further, since the abrasion powder of the sealing material is not mixed into the liquid in the pump head 13, there is no problem of contaminating the fluid discharged to the mixing container 3. Furthermore, since the life of the partition wall 24 as a sealing material can be extended, it is possible to reduce the maintenance cost of the entire dispensing apparatus by reducing the frequency of replacement of the sealing material (or replacement of the pump) as much as possible. it can.

  Since the partition wall portion 24 is made of nitrile rubber having excellent durability and elasticity, it can be made suitable for the plunger pump 10. The material of the partition wall 24 may be, for example, a synthetic resin having chemical resistance, and may be appropriately changed according to the properties of the liquid to be transferred.

<Second embodiment>
7 and 8 show a second embodiment of the present invention, and differences from the first embodiment will be described. FIG. 7 schematically shows a specimen testing apparatus, and the same reference numerals are given to the same parts as those in the first embodiment.

  This sample testing apparatus analyzes a sample by reacting a sample (for example, blood (serum) or urine) with a reagent. The sample 31a and the reagent stored in the sample container (liquid storage container) 31 are analyzed. The reagent 32a stored in the container (liquid storage container) 32 is configured to be dispensed into a reaction container 33 which is a separate container. The sample testing apparatus analyzes the sample 31a in the reaction container 33, the stirring mechanism 34 that causes the sample 31a and the reagent 32a to react by stirring in the reaction container 33, the cleaning mechanism 35 that cleans the plunger pump 10. And an analysis unit 36. Although a detailed description is omitted, the cleaning mechanism 35 cleans the plunger pump 10 with a cleaning liquid in a cleaning tank, for example, to prevent contamination (ie, carryover or contamination) between the previous sample and the subsequent sample. To prevent. The analysis unit 36 as an analysis mechanism measures the specimen 31a for each examination item, and performs analysis such as so-called biochemical analysis.

  Here, the control circuit 28 is connected to drive circuits 37 and 38 for driving the stirring mechanism 34 and the cleaning mechanism 35, respectively, and to the analysis unit 36 and the like. The ROM of the control circuit 28 stores a series of inspection programs and the like for analyzing the specimen 31a by dispensing and reacting the specimen 31a and the reagent 32a. The control circuit 28 controls the moving device 11, the stepping motor 17, the stirring mechanism 34, the cleaning mechanism 35, the analysis unit 36, and the like according to the inspection program.

Next, the operation of the sample testing apparatus of this embodiment will be described with reference to FIG. The flowchart in FIG. 8 shows a processing procedure executed by the control circuit 28 in the specimen test.
That is, as described above, the sample container 31 (schematically shown in FIG. 7), which is a test tube, contains the collected sample 31a, and the plunger pump 10 moves above the sample container 31 to move the nozzle 12 descends so as to be immersed in the specimen 31 a in the specimen container 31. In this state, the piston 14 is driven via the orthogonal transformation mechanism 18 by forward rotation of the motor 17, whereby the specimen 31a in the specimen container 31 is sucked into the pump chamber 13a from the nozzle 12 (step S11). . In this case, as the piston body 22 moves in the forward path, the bellows portion 24a of the partition wall portion 24 contracts so as to be folded. When a predetermined amount of the sample 31a is sucked into the pump chamber 13a and the motor 17 is stopped, the plunger pump 10 rises, moves upward above the reaction vessel 33, and then descends. Then, the piston 17 is driven by the reverse rotation of the motor 17 via the orthogonal transformation mechanism 18, and the specimen 31a in the pump chamber 13a is discharged from the nozzle 12 to the reaction vessel 33 as a reaction cell (step S12). At this time, the bellows portion 24a extends as the piston body 22 moves along the return path.

  Next, the plunger pump 10 moves to the cleaning mechanism 35, and the pump chamber 13a and the nozzle 12 are cleaned with the cleaning liquid in the cleaning tank (step S13). Thereafter, the plunger pump 10 moves above the reagent container 32 as a test tube, and descends so that the nozzle 12 is immersed in the reagent 32 a in the reagent container 32. In this state, when the piston 17 is driven via the orthogonal transformation mechanism 18 by forward rotation of the motor 17, the reagent 32a in the reagent container 32 is sucked into the pump chamber 13a from the nozzle 12 (step S14). . In this case, as the piston main body 22 moves in the outward path in the same manner as described above, the bellows portion 24a of the partition wall portion 24 contracts so as to be folded.

  When a predetermined amount of reagent 32a is sucked into the pump chamber 13a and the motor 17 is stopped, the plunger pump 10 is raised, moved upward above the reaction vessel 33, and then lowered. Then, the reagent 32a is added to the specimen 31a in the reaction container 33 by driving the piston 14 via the orthogonal transformation mechanism 18 by the reverse rotation of the motor 17 (step S15). At this time, the bellows portion 24a extends as the piston body 22 moves along the return path in the same manner as described above. The specimen 31a and the reagent 32a in the reaction container 33 react by being stirred and mixed by the stirring mechanism 34 (step S16). Here, the specimen 31a reacted with the reagent 32a is subjected to analysis such as biochemical analysis in the analysis unit 36 (step S17).

  On the other hand, the plunger pump 10 discharges the reagent 32a to the reaction container 33 in step S15, and then in step S18, the pump chamber 13a and the nozzle 12 are cleaned by the cleaning mechanism 35, and the process returns to step S11. The sample testing apparatus of the present embodiment can continuously execute dispensing and testing for a plurality of samples 31a (only one is shown in FIG. 6) with a series of operations from step S11 to step S18 as one cycle. It is configured. If there is no problem of contamination, it is possible to continuously suck both the specimen 31a and the reagent 32a from the nozzle 12.

  According to the sample testing apparatus of the present embodiment, the abrasion powder of the sealing material does not enter the sample 31a and the reagent 32a in the pump head 13, so that the sample 31a and the reagent 32a discharged to the reaction container 33 are contaminated. In addition, since the partition wall 24 can prevent the liquids 31a and 32a from flowing out, sampling with high measurement accuracy and high reliability can be realized. Furthermore, since the life of the partition wall portion 24 can be extended, the maintenance cost of the entire specimen testing apparatus can be suppressed. In addition, according to the present embodiment, by forming the partition wall portion 24 in a cylindrical bellows shape, it is possible to sufficiently secure the stroke of the piston 14 and the suction amount (discharge amount) of the liquid (specimen 31a and reagent 32a). The same effects as the first embodiment can be obtained.

  The present invention is not limited to a specimen testing apparatus, and can be applied to all dispensing apparatuses that transfer liquid using a plunger pump. The piston 14 of the present invention only needs to change the volume in the pump head 13 by the reciprocation thereof, and the piston rod 21 and the piston main body 22 may be constituted by one member, or the piston rod 21 and the piston main body. 22 may be set to have the same diameter and may be configured to have a rod shape as a whole. In the case of this rod-shaped piston, it is possible to make it fit to the piston by forming one flange portion of the partition wall portion 24 so as to protrude radially inward. As described above, the partition wall 24 may be anything as long as it partitions the inside of the pump head 13 and the drive unit 15 and expands and contracts along the reciprocation of the piston, and the shape thereof is not limited to the above. Absent. Further, since the bellows portion 24a is disposed around the piston rod 21, the gap between the outer peripheral surface of the piston rod 21 and the inner peripheral surface of the pump head 13 is set at the pitch of the bellows portion 24a, the amount of movement of the piston 14, and the liquid. Depending on the suction amount (discharge amount), a desired size may be set.

  In addition, the housing 16 only needs to accommodate at least a part of the drive unit 15, and may be configured to accommodate both the orthogonal transformation mechanism 18 and the motor 17. In the above embodiment, the nozzle 12 is configured to serve as both a suction port and a discharge port. However, the pump head 13 may be provided with a suction port and a discharge port separately instead of the nozzle 12. That is, a check valve is provided in each of the suction port and the discharge port, and the volume in the pump head 13 is changed by the reciprocating motion of the piston 14 so that the liquid is sucked from the suction port and separate from the suction port. You may comprise so that it may discharge from this discharge port. In addition, the present invention can be implemented with appropriate modifications without departing from the scope of the invention.

The 1st Example of this invention is shown, and the schematic diagram of the whole dispensing apparatus Overview perspective view of plunger pump Schematic cross-sectional view showing a partially broken plunger pump Perspective view from the base end side of the piston body Sectional view showing enlarged partition (A) And (b) is a figure for demonstrating operation | movement of the plunger pump at the time of discharge and attraction | suction, and sectional drawing which expands and shows a pump chamber vicinity part The 2nd Example of the present invention is shown and a schematic diagram of the whole sample inspection device Flow chart of a test program in a sample testing device

Explanation of symbols

  In the drawings, 1 is a first container (liquid container), 1a is a first liquid (liquid), 2 is a second container (liquid container), 2a is a second liquid (liquid), and 3 is a mixing container (separate container). ) 10 is a plunger pump, 12 is a nozzle, 13 is a pump head, 14 is a piston, 15 is a drive unit, 16 is a housing, 17 is a motor, 18 is an orthogonal transformation mechanism (transmission mechanism), and 23b is a partition fitting portion. (Fitting part), 24 is a partition part, 24b is one collar part, 24c is the other collar part, 31 is a sample container (liquid container), 31a is a sample (liquid), 32 is a reagent container (liquid container) ), 32a is a reagent (liquid), and 33 is a reaction vessel (separate vessel).

Claims (7)

A pump head,
A piston that is reciprocally inserted into the pump head and changes the volume in the pump head by the reciprocating motion, thereby sucking fluid into the pump head and discharging fluid out of the pump head. When,
A drive unit for reciprocating the piston;
A partition portion provided between the piston and the pump head, partitioning the inside of the pump head and the drive portion side, and extending and contracting along the reciprocating motion of the piston; A featured plunger pump.   2. The plunger pump according to claim 1, wherein the partition wall portion is made of a flexible material and is formed in a cylindrical bellows shape that is folded by the movement of the piston.   Provided with flanges at both ends of the partition wall, one of the flanges being fixed to the piston, and the other flange being fixed to the end of the pump head on the drive unit side. The plunger pump according to claim 1 or 2, characterized in that: A housing that houses at least a portion of the drive unit and that is continuous with the pump head;
The one flange is fixed by caulking in a state of being fitted to a fitting portion provided on the piston,
4. The plunger pump according to claim 3, wherein the other flange is fixed so as to be sandwiched between the pump head and the housing.   5. The plunger pump according to claim 1, wherein the driving unit is configured by a motor and a transmission mechanism that converts a rotational motion of the motor into a reciprocating motion of the piston and transmits the converted motion. A dispensing device for transferring a liquid from a liquid storage container to another container using the plunger pump according to any one of claims 1 to 5,
The plunger pump has a nozzle in the pump head, drives the piston by the driving unit, sucks the liquid in the liquid storage container from the nozzle into the pump head, and transfers the liquid from the nozzle to the separate container. A dispensing apparatus characterized by being configured to discharge liquid. A specimen test apparatus for transferring a specimen and a reagent using the plunger pump according to any one of claims 1 to 5 and reacting the specimen and the reagent to analyze the specimen,
The specimen and reagent are separately stored in a plurality of liquid storage containers,
The plunger pump has a nozzle in the pump head, drives the piston by the drive unit, and sucks the specimen or reagent in the liquid storage container from the nozzle into the pump head, and the reaction container from the nozzle A specimen inspection apparatus configured to discharge a specimen or reagent aspirated from the navel.

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