JP5750343B2 - Container for measurement - Google Patents

Description

  The present invention relates to a measurement container used for liquid measurement.

  Currently, many devices for measuring liquids, such as optical measurement, are known. For example, many bioassays using measurement methods for measuring algae by optical measurements such as delayed luminescence, fluorescence, absorbance, and turbidity have been developed. In such an apparatus, for example, a sample obtained by mixing a certain amount of sample liquid and an algal cell suspension is prepared, the sample is replaced with the sample every time the sample is measured, and a new container is installed in the sample chamber. Measurement. On the other hand, when such a technique is used, for example, for monitoring river water or factory effluent, it is required to sample and measure a sample continuously instead of exchanging the container for each measurement. As described above, Patent Document 1 is known to enable measurement by continuously sampling a sample liquid. In Patent Document 1, a sample liquid is supplied to a sample chamber by a liquid feed pump, and the liquid in the sample chamber is measured. Furthermore, a technique for supplying a sample to a sample chamber using a tube pump is also known.

International Publication No. 93/12415

  However, in Patent Document 1 described above, when liquid is supplied to the sample chamber by the liquid feed pump, there is a possibility that an object such as a cell in the liquid is destroyed. For example, when a tube pump is used, the cells in the liquid are damaged by being pressed with a tube roller during liquid feeding. In addition, these devices require an external device such as a pump in addition to the sample chamber for measurement. As a result, there is a problem that the apparatus becomes larger and costs increase.

  The present invention has been made to solve such a problem, and is intended to reduce the size of the apparatus and to enable continuous sampling and measurement without damaging an object in the liquid. The purpose is to provide.

  A measuring container according to the present invention is a measuring container used for measuring a liquid, and includes a container main body portion that stores a liquid, a piston that reciprocates inside the container main body portion, and an inside of the container main body portion. An inflow port through which liquid flows in and an exhaust port through which liquid inside the container main body is discharged, and the piston moves through the inside of the container main body so as to supply and discharge liquid from the inflow port. The liquid is discharged from the outlet, and the container main body constitutes a sample chamber in which the liquid is measured.

  According to the measurement container of the present invention, the piston can move the inside of the container main body to supply the liquid from the inflow port and drain the liquid from the discharge port. Thus, since supply and drainage can be repeated by moving the piston, the liquid can be continuously sampled and measured. Also, in the method of supplying liquid by suction by piston operation, unlike other methods, it is possible to supply liquid without damaging an object in the liquid such as a cell. Furthermore, the container body itself in which the piston reciprocates constitutes a sample chamber. That is, the structure can be simplified by integrating the liquid feeding mechanism and the sample chamber. Thereby, it is possible to reduce the size of the apparatus and to reduce the cost. As described above, the apparatus can be reduced in size, and continuous sampling and measurement can be performed without damaging an object in the liquid.

  In the measurement container according to the present invention, the piston preferably includes a cleaning tool for cleaning the inner peripheral surface of the container main body. Since the cleaning tool also moves as the piston reciprocates, the inner peripheral surface of the container main body can be cleaned simultaneously with the liquid feeding. Thus, the structure can be further simplified by integrating the liquid feeding mechanism, the sample chamber, and the cleaning mechanism.

  In the measurement container according to the present invention, it is preferable that the discharge port is formed on at least one side in the moving direction of the piston, and the cleaning tool is provided on the discharge port side. As a result, the cleaning tool removes dirt from the inner peripheral surface of the container main body on the discharge port side, and the dirt drifting in the liquid on the discharge port side can be immediately discharged from the discharge port by the movement of the piston.

  In the measurement container according to the present invention, the discharge port is formed on one side in the moving direction of the piston, the inflow port is formed on the other side in the moving direction, and the piston passes through the liquid from the inflow port side to the discharge port side. Has a valve structure that restricts the passage of liquid from the discharge port side to the inlet side, and the piston moves from the discharge port side to the inlet side, so that the liquid on the inlet side from the piston is valved. The piston is moved from the piston to the discharge port side, and the piston moves from the inflow port side to the discharge port side, whereby the existing liquid is pumped to the piston and drained from the discharge port, and new liquid is sucked into the piston. It is preferable that the liquid is supplied from the inlet. With such a configuration, the discharge port can be disposed on the opposite side of the inflow port via the piston. By disposing the discharge port on the side opposite to the inflow port in this way, dirt remaining on the inflow port side can be reduced.

  According to the present invention, the apparatus can be reduced in size, and continuous sampling and measurement can be performed without damaging an object in the sample liquid.

It is the schematic block diagram which showed the structure of the measurement container which concerns on 1st Embodiment of this invention. It is a figure which shows operation | movement of the measurement container which concerns on 1st Embodiment of this invention. It is a figure which shows the general optical measurement apparatus of algae. It is the figure which applied the measurement container which concerns on 1st Embodiment to the optical measuring device of FIG. It is the schematic block diagram which showed the structure of the container for a measurement which concerns on 2nd Embodiment of this invention. It is a figure which shows operation | movement of the container for a measurement which concerns on 2nd Embodiment of this invention. It is the schematic block diagram which showed the structure of the container for a measurement which concerns on 3rd Embodiment of this invention. It is a figure which shows operation | movement of the container for a measurement which concerns on 3rd Embodiment of this invention.

[First Embodiment]
A measurement container 1 according to an embodiment of the present invention is for containing a liquid to be measured, set in a measurement device, and performing measurement. The measurement container 1 operates as a piston pump as a whole, and is a unit in which a sample chamber, a liquid feeding mechanism, and a cleaning mechanism are combined into one unit. The liquid to be measured as a sample is, for example, a liquid obtained by mixing a certain amount of sample liquid and an algal cell suspension, river water, factory waste water, tap water, sewage, drinking water, and the like. As a measurement method, a measurement method capable of observing a measurement container such as an electromagnetic wave, a terahertz wave, and NMR in a non-destructive manner is applied in addition to optical measurement. As shown in FIG. 1, the measurement container 1 includes a container body 2, a piston 3, an inlet 4, and an outlet 6.

  The container main body 2 is a part that accommodates a sample liquid and functions as a sample chamber in which the liquid is measured. When performing optical measurement, the container main body 2 is formed of a shape and material suitable for optical measurement. When other measurement methods are applied, the shape and material are suitable for each method. The container main body 2 is made of a material that can transmit light, and is made of, for example, glass or resin. The container body 2 includes a tubular portion 11 having a predetermined cross-sectional shape and extending straight in one direction so that the piston 3 can reciprocate therein, and end wall portions 12 for sealing both ends of the tubular portion 11, 13 is provided. The shape of the tubular portion 11 is not particularly limited, but it is preferable that the piston 3 can be rotated for cleaning by using a cylindrical shape.

  The end wall 13 of the container main body 2 is provided with an inlet 4 through which liquid flows into the container main body 2. The inflow port 4 has a configuration in which an opening is provided in the end wall portion 13 and a pipe is connected to the opening. The end wall 13 is provided with an inflow valve 14 that allows passage of liquid from the inlet 4 toward the container body 2 and restricts passage of liquid from the container body 2 toward the inlet 4. . The end wall 12 of the container body 2 is provided with a discharge port 6 for discharging the liquid from the inside of the container body 2. The discharge port 6 has a configuration in which an opening is provided in the end wall portion 12 and a pipe is connected to the opening. The inlet 4 and the outlet 6 may be provided on the side surface of the tubular portion 11 in addition to the end wall portions 13 and 12. However, in this case, the inlet 4 must be outside the movement range of the seam line 16 of the piston 3 and on the end wall 13 side. Similarly, the discharge port 6 must be outside the movement range of the seam line 16 of the piston 3 and on the end wall 12 side.

  The piston 3 reciprocates inside the container body 2. The piston 3 has a shape and a size corresponding to the inner peripheral surface 2 a of the container main body 2, and is fitted with the inner peripheral surface 2 a of the container main body 2 at a seam line 16 that is an outer peripheral edge. The piston 3 is provided with a cleaning tool 17 for cleaning the inner peripheral surface 2a of the container body 2. As a cleaning method of the cleaning tool 17, a brush, sponge, rubber plate, a method of rubbing with a hard plate designed to be precisely rubbed, etc. can be used. The cleaning tool 17 may be provided on either side of the piston 3, but is preferably provided on the discharge port 6 side. The piston 3 and the cleaning tool 17 have a through hole 18. The through-hole 18 is provided with a piston valve 19 that allows passage of liquid from the inlet 4 side to the outlet 6 side and restricts passage of liquid from the outlet 6 side to the inlet 4 side.

  The piston 3 is held by a shaft 21 so that it can be operated from the outside of the container body 2. The shaft 21 is connected to the piston 3 via the arm 22 so as to avoid the through hole 18. The arm 22 can be omitted by shifting the mounting positions of the through hole 18 and the shaft 21. A drive mechanism (not shown) such as a gear or a motor is connected to the shaft 21 so that the piston 3 can reciprocate inside the container body 2. In order to enhance the cleaning effect, the drive mechanism is preferably configured to reciprocate while moving the piston 3. For example, a spiral screw is cut on the shaft 21 (or a member having a spiral screw is attached), and the shaft 21 can be reciprocated with a rotational motion by a combination of a gear and a motor. The end wall portion 12 includes a seal portion 23 between the end wall portion 12 and the shaft 21. Note that the piston 3 may reciprocate by other methods instead of moving by operating the shaft 21. For example, the piston 3 may be reciprocated by a non-contact force field such as a magnet. For example, an annular magnet may be disposed on the outer peripheral surface of the container body 2 so as to surround the piston 3 via the container body 2. By reciprocating the annular magnet while rotating, the piston 3 can reciprocate while rotating accordingly.

  Moreover, it is preferable that the backflow prevention structure which prevents that a liquid flows backward is applied to the measurement container 1. The backflow is, for example, that the discharged liquid flows back from the discharge port 6 side in the “hold” state of FIG. 2, that is, in the measurement state. In this case, the piston 3 falls during the measurement. As an example of the backflow prevention structure, a structure in which an electromagnetic valve or the like is provided in the middle of the pipe of the discharge port 6 can be given. Moreover, the structure which makes the piston valve 19 strong and prevents a back flow reliably arises.

  Next, the operation of the measurement container 1 will be described with reference to FIG.

  First, in the “standby 1” state, the piston 3 is arranged on the inlet 4 side. In “feed / drainage liquid 1”, the piston 3 moves to the discharge port 6 side. At this time, the piston valve 19 of the piston 3 is closed and the inflow valve 14 is opened. As a result, the liquid L sucked by the piston 3 flows into the container body 2 via the inflow valve 14. On the other hand, the liquid originally present in the container main body 2 is discharged from the discharge port 6. In order to facilitate understanding of the flow of the liquid, in “standby 1” and “supply / drainage liquid 1”, a pattern is given only to the liquid L flowing in this time, and a pattern is given to the existing liquid to be discharged. Not. When the movement of the piston to the predetermined position on the discharge port 6 side is completed, a “hold” state is established. Optical measurement of the liquid L in the container main body 2 is performed in the “held” state. At this time, the container body 2 functions as a sample chamber.

  Thereafter, the process moves to “moving cleaning”, and the piston 3 moves to the inlet 4 side. At this time, the piston valve 19 is opened, and the inflow valve 14 is closed. As a result, the liquid L on the inlet 4 side moves to the outlet 6 side via the piston valve 19. On the other hand, the inflow valve 14 restricts the passage of the liquid L and prevents the liquid L from flowing back to the inflow port 4. At this time, the cleaning tool 17 attached to the piston 3 cleans algae attached to the inner peripheral surface of the container main body 2, algae secretions, dirt contained in the sample (indicated by P in the figure), and the like. The dirt P discharged at this time is restricted by the seam line 16 of the piston 3 so that it does not enter the inlet 4 side of the seam line 16 of the piston 3. On the other hand, a part of the dirt P is also scraped off by the seam line 16 of the piston 3 and thereby discharged into the liquid L on the inlet 4 side. The dirt P travels toward the discharge port 6 along the liquid flow of the liquid L moving from the inlet 4 side to the discharge port 6 side via the piston valve 19 of the piston 3. When the piston 3 moves to a predetermined position on the inlet 4 side, the moving cleaning is completed. Although the liquid L may remain slightly on the inlet 4 side of the seam line 16 of the piston 3 and the dirt P may remain, the amount is extremely small compared to the entire volume and affects the next measurement. (Note that the container main body 2 itself may be replaced if it is affected by dirt by repeated measurement).

  Thereafter, the flow proceeds to “supply / drainage liquid 2”. In this process, the piston 3 moves again to the discharge port 6 side. At this time, the piston valve 19 is in a closed state, and the inflow valve 14 is in an open state. Accordingly, the liquid L on the side of the discharge port 6 with respect to the seam line 16 of the piston 3 does not move toward the inlet 4 side of the piston 3 but is pumped to the moving piston 3 and is sent from the discharge port 6 to the container body 2. Is discharged outside. At this time, the dirt P generated during the “moving cleaning” is discharged together. If the container body 2 is designed in a cylindrical shape, when the piston 3 is moved, by rotating the piston 3 along the outer periphery, the cleaning tool 17 also moves while rotating, thereby increasing the cleaning effect. Can do. Further, the cleaning effect can be enhanced by repeating “moving cleaning” and “feed / drainage liquid 2”. On the other hand, on the inlet 4 side, new liquid flows into the container main body 2 by being sucked by the moving piston 3. Therefore, when the “supply / drainage liquid 2” is completed, the container main body 2 functioning as the sample chamber is filled with fresh liquid and is again in the “holding state”, and becomes measurable. In addition, in order to make it easy to understand the flow of the liquid, in the “supply / drainage liquid 2”, a pattern is given only to the liquid L discharged this time, and a pattern is not given to the existing liquid flowing in.

  The measurement container 1 according to the present embodiment can perform only the reciprocation of the piston 3 without damaging the cells by continually sampling, optically measuring, and washing a liquid sample such as a cell suspension by the above procedure. Can be realized.

  Next, an example in which the measurement container 1 according to the present embodiment is combined with a conventional optical measurement device will be described. In addition, a comparison between a conventional structure and a structure to which the measurement container 1 according to the present embodiment is applied is also performed.

  FIG. 3 shows a general optical measurement apparatus for algae. The optical measurement device 100 is a delayed luminescence measurement device, and includes a first chamber 101 in which a sample container V is stored, a second chamber 102, an excitation light source 103 provided in the first chamber 101, and a second chamber. A photomultiplier tube 104 disposed in the first room 102 and a shutter 106 that partitions the first room 101 and the second room 102. The shape of the sample container V is, for example, a test tube having a diameter of 25 mm. In the “excitation” state, the sample container V filled with the sample liquid L is stored in the first chamber 101, the shutter 106 is closed, and the excitation light source 103 irradiates the liquid L with excitation light. In the “measurement” state, the excitation light source 103 is turned off and the shutter 106 is opened. Thereby, the photomultiplier tube 104 detects the delayed light emission DL generated from the liquid L of the sample. In the configuration of FIG. 3, after one measurement, the sample container V is taken out and replaced with another sample container V, and the next measurement is performed.

  In the case of performing measurement by continuous sampling using optical measurement of algae, as an existing structure, an exposure culture tank 110 as shown in FIG. 4 (details will be described later) with respect to the configuration of FIG. A configuration is known in which a liquid supply pipe 111 extending to the sample container and a drainage pipe extending from the sample container to the outside are added, and a liquid feed pump such as a tube pump or other pump is installed in the liquid supply pipe 111. . In this case, a continuous collection of samples (river water, drainage, etc.) that may contain harmful factors from algae suspensions with a constant or controlled algal cell density. And in the exposure culture tank 110 or the like. By operating the liquid feeding pump, a certain amount of the mixed sample liquid L is fed from the exposure culture tank 110 to the sample chamber in the optical measuring device 100.

  Here, when measurement is performed by continuous sampling, it is necessary to periodically clean the inner wall or replace the container itself in order to adhere algae and secretions thereof, dirt in the sample, and the like to the sample chamber wall. In response to such a requirement, a structure having a mechanism for cleaning the sample chamber after measurement is also known. In such a conventional structure, salt water is flowed into the sample chamber after measurement in order to clean the sample chamber to kill algae. In such a technique, it is necessary to perform the next measurement after washing the salt water so that the salt water does not have a toxic effect on the freshwater algae as a sample.

  The conventional structure as described above has the following problems. That is, when the liquid is supplied to the sample chamber by the liquid feed pump, cells in the liquid may be destroyed. For example, when a tube pump is used, the cells in the liquid are damaged by being pressed with a tube roller during liquid feeding. Furthermore, according to the conventional structure, an external device such as a pump or a cleaning device is required in addition to the sample chamber for measurement. That is, in the conventional structure, since the liquid feeding mechanism, the sample chamber, and the cleaning mechanism are individually provided, there is a problem that the entire apparatus is increased in size and costs are increased. In addition, the increase in the number of operating parts causes a complicated control mechanism and an increase in the cause of failure.

  FIG. 4 shows a structure in which a measurement container according to this embodiment is applied to a general optical measurement apparatus. When the measurement container 1 according to the present embodiment is used, if the piston pump type sample chamber is designed in accordance with the sample container size (25 mm diameter test tube) of the existing apparatus, the configuration of the existing apparatus is not greatly modified. The existing sample container V can be replaced. At this time, at least the inlet 4 and the outlet 6 need to be extended outside the apparatus (a liquid supply pipe 111 is provided on the inlet 4 side). Since the inflow port 4 and the discharge port 6 penetrate the apparatus housing, the entry of external light becomes a problem. However, it is possible to solve by general measures such as using a material that does not allow light to pass through the penetrating passage and a light maze structure. . By connecting the supply pipe 111 of the inlet 4 to the exposure culture tank 110 configured by existing technology, operating the piston pump of the measurement container 1, and operating the conventional optical measuring device 100 in the holding state, Optical measurement can be performed as usual. After the measurement is completed, cleaning is performed by performing the “moving cleaning” and “feed / drainage liquid 2” operations shown in FIG. 2, and the sample can be continuously sampled and measured. As described above, by attaching the measurement container 1 according to the present embodiment, it is possible to support measurement by continuous sampling with the minimum modification without changing the basic configuration of the detector of the existing apparatus. In this way, since the structure of a simple piston pump that integrates multiple parts such as the sample chamber, liquid feed pump, and cleaning tool is adopted, the size of the sample chamber can be easily changed from small to large be able to. For this reason, the measurement container 1 can be used as a continuous sampling type measurement device without greatly changing the configuration of the existing optical measurement device 100.

  As described above, according to the measuring container 1 according to the present embodiment, the piston 3 moves inside the container main body 2, thereby supplying the liquid from the inlet 4 and the liquid from the outlet 6. Draining can be performed. As described above, since the supply and drainage can be repeated by the movement of the piston 3, the liquid can be continuously sampled and measured. Also, in the method of supplying liquid by suction by piston operation, unlike other methods, it is possible to supply liquid without damaging an object in the liquid such as a cell. Furthermore, the container main body 2 itself with which the piston 3 reciprocates constitutes a sample chamber. That is, the structure can be simplified by integrating the liquid feeding mechanism and the sample chamber. Thereby, it is possible to reduce the size of the apparatus and to reduce the cost. As described above, the apparatus can be reduced in size, and continuous sampling and measurement can be performed without damaging an object in the liquid.

  Further, in the measurement container 1 according to the present embodiment, the piston 3 has a cleaning tool for cleaning the inner peripheral surface 2 a of the container main body 2. Since the cleaning tool 17 also moves as the piston 3 reciprocates, the inner peripheral surface 2a of the container body 2 can be cleaned simultaneously with the liquid feeding. Thus, the structure can be simplified by integrating the liquid feeding mechanism, the sample chamber, and the cleaning mechanism.

  In the measurement container 1 according to the present embodiment, it is preferable that the discharge port 6 is formed on one side in the moving direction of the piston 3 and the cleaning tool 17 is provided on the discharge port 6 side. Thereby, the cleaning tool 17 removes dirt from the inner peripheral surface 2a of the container main body 2 on the discharge port 6 side, and the dirt drifting in the liquid on the discharge port 6 side can be immediately discharged from the discharge port 6 by the movement of the piston 3. .

  In the measurement container 1 according to the present embodiment, the discharge port 6 is formed on one side in the movement direction of the piston 3, the inlet 4 is formed on the other side in the movement direction, and the piston 3 is on the inlet 4 side. A piston valve 19 that permits passage of liquid from the discharge port 6 toward the discharge port 6 and restricts passage of liquid from the discharge port 6 toward the inflow port 4. With such a configuration, the discharge port can be disposed on the opposite side of the inflow port via the piston. By disposing the discharge port on the side opposite to the inflow port in this way, dirt remaining on the inflow port side can be reduced. Further, even if the cleaning tool 17 itself accumulates dirt, it is possible to prevent the accumulated dirt from being mixed into the liquid newly introduced from the inlet 4 side.

[Second Embodiment]
With reference to FIG.5 and FIG.6, the container 50 for a measurement which concerns on 2nd Embodiment is demonstrated. The measurement container 50 according to the second embodiment is mainly different from the measurement container 1 according to the first embodiment in that the discharge port 6 and the inflow port 4 are provided in the same direction. As shown in FIG. 5, the container main body portion 52 has a tubular portion 61 and end wall portions 62 and 63, and the inflow port 4 and the discharge port 6 are provided in one end wall portion 63. The discharge port 6 is provided with a discharge valve 69 that allows liquid to pass only in the discharge direction. The piston 53 is not provided with a through hole. The cleaning tool 67 is provided on the discharge port 6 side (in the same direction as the inflow port 4 side). Similarly to the piston 3 according to the first embodiment, the moving method of the piston 53 according to the present embodiment is not particularly limited. The inlet 4 and the outlet 6 may be provided on the side surface of the tubular portion 61 in addition to the end wall portion 63. However, in this case, the inlet 4 and the outlet 6 must be outside the moving range of the seam line 16 of the piston 53 and on the end wall 63 side.

  As shown in FIG. 6A, when the liquid is supplied, the piston 3 moves in a direction away from the inflow port 4 (and the discharge port 6), so that the liquid L flows in from the inflow port 4. At this time, the inflow valve 14 is opened and the discharge valve 69 is closed. As a result, the container body 52 is filled with the liquid L, and the piston 3 is held in this state to perform measurement. As shown in FIG. 6B, at the time of drainage, the liquid L is discharged from the discharge port 6 by moving the piston 3 toward the discharge port 6 (and the inflow port 4). At this time, the inflow valve 14 is closed and the discharge valve 69 is opened. Further, the inner peripheral surface 52 a of the container main body 52 is cleaned by the cleaning tool 67 in accordance with the movement of the piston 3 for draining. The generated dirt P is immediately discharged from the discharge port 6.

  As described above, even if the discharge port 6 is provided in the same direction as the inflow port 4, the sample chamber, the liquid feeding mechanism, and the cleaning mechanism can be integrated for simplification. An effect can be obtained. In the measurement container 50 according to the second embodiment, the sample chamber is a single section, but the airtightness of the sample chamber is maintained by the seam line 16 of the piston 53, so that the shaft 21 penetrates the sample chamber. Even if the seal portion 23 is incomplete, there is an advantage that the liquid leakage of the sample is small.

[Third Embodiment]
With reference to FIG.7 and FIG.8, the container 70 for a measurement which concerns on 3rd Embodiment is demonstrated. The measurement container 70 according to the third embodiment is mainly different from the measurement container 1 according to the first embodiment in that the through hole 88 provided in the piston 73 functions as the discharge port 6 as it is. . As shown in FIG. 7, a hollow shaft 81 is provided so as to communicate with the through hole 88 of the piston 73 instead of the shaft 21 of the first embodiment. The hollow shaft 81 is connected to the discharge port 6 at the inside thereof, and functions as a discharge channel that guides the discharged liquid to the outside of the container main body 72. The piston valve 89 functions as a discharge valve that allows liquid to pass only in the discharge direction. The container main body 72 has the same configuration as that of the first embodiment with respect to the tubular portion 11 and the end wall portion 13, but the end wall portion 82 has a configuration in which a hollow shaft 81 serves as a discharge pipe and a shaft. Therefore, the seal 83 is provided so as to open only at the position of the shaft 81 and surround the shaft 81. The cleaning tool 87 is provided on the discharge port 6 side (that is, in the same direction as the inflow port 4 side). Similarly to the piston 73 according to the first embodiment, the movement method of the piston 73 according to the present embodiment is not particularly limited. The inflow port 4 may be provided on the side surface of the tubular portion 11 in addition to the end wall portion 13. However, in this case, the inflow port 4 must be outside the moving range of the seam line 16 of the piston 73 and on the end wall 13 side.

  As shown in FIG. 8A, when supplying liquid, the piston 73 moves in a direction away from the inflow port 4, so that the liquid L flows in from the inflow port 4. At this time, the inflow valve 14 is opened and the piston valve 89 is closed. As a result, the container main body 72 is filled with the liquid L, and the piston 73 is held in this state to perform measurement. As shown in FIG. 8B, at the time of drainage, the liquid L is discharged from the discharge port 6 by moving the piston 73 toward the inlet 4 side. At this time, the inflow valve 14 is closed and the piston valve 89 is opened. Further, the inner peripheral surface 72 a of the container main body 72 is cleaned with the cleaning tool 87 in accordance with the movement of the piston 73 for draining. The generated dirt P is immediately discharged from the discharge port 6.

  As described above, even if the discharge port 6 is provided in the same direction as the inflow port 4, the sample chamber, the liquid feeding mechanism, and the cleaning mechanism can be integrated for simplification. An effect can be obtained. In the measurement container 70 according to the third embodiment, the sample chamber is a single compartment, but the airtightness of the sample chamber is maintained by the seam line 16 of the piston 73, so that the shaft 81 penetrates the sample chamber. Even if the seal portion 83 is incomplete, there is an advantage that the leakage of the sample liquid is small.

  The present invention is not limited to the above-described embodiment. For example, the shape and size of the container main body and the piston may be appropriately changed according to the measurement device to be applied. Moreover, the cleaning tool does not need to be provided. Further, as long as the liquid can be fed by the piston pump system, the other configurations are not particularly limited, and the configuration in which the valve is provided in the form described above is acting, but another structure is adopted. Also good.

  DESCRIPTION OF SYMBOLS 1,50,70 ... Container for measurement, 2,52,72 ... Container main body part, 3,53,73 ... Piston, 4 ... Inlet, 6 ... Outlet, 17, 67, 87 ... Cleaning tool.

Claims (1)

A measuring container used for measuring a liquid,
A cylindrical container main body containing the liquid;
A piston that reciprocates while rotating inside the container body, and
An inflow port through which the liquid flows into the container main body,
A discharge port for discharging the liquid inside the container main body, and
The piston moves inside the container main body, thereby supplying the liquid from the inflow port and discharging the liquid from the discharge port.
The container body portion constitutes a sample chamber in which the liquid is measured ,
The piston has a cleaning tool for cleaning the inner peripheral surface of the container main body,
The discharge port is formed in at least one of the movement directions of the piston,
The cleaning tool is provided on the outlet side,
The discharge port is formed on one side in the movement direction of the piston, the inflow port is formed on the other side in the movement direction,
The piston has a valve that allows passage of the liquid from the inlet side toward the outlet side and restricts passage of the liquid from the outlet side toward the inlet side,
The piston moves from the outlet side to the inlet side, thereby moving the liquid on the inlet side from the piston to the outlet side from the piston via the valve.
When the piston moves from the inlet side to the outlet side, the existing liquid is pumped to the piston and drained from the outlet, and new liquid is sucked by the piston and flows. A measuring container which is supplied from an inlet .

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