JP2010025804A - Nozzle unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nozzle unit capable of more certainly performing proper suction/discharge treatment. <P>SOLUTION: The nozzle unit 10 mounted on a dispenser has a pipe 64 of which the leading end 90 is sharply formed and which has a double pipe structure keeping a liquid passage 80 and an air passage 84 sequentially arranged thereto from the inside in a concentric circular state. The liquid passage 80 is bent by almost 90° at the position slightly near to the rear end of the leading end 90 and a liquid suction and discharge port 82 is formed to the side surface of the pipe 64. Further, the air passage 84 communicates with the air suction and discharge port 86 provided in the side surface of the pipe 64 at the position in the vicinity of the rear end of the liquid suction and discharge port 82. Viewed from another angle, the leading end 90 of the pipe 64 is formed into a solid conical shape having no opening formed thereto. By this arrangement, even if the nozzle unit 10 pierces the plug body of a container, no cut refuse is produced and, as a result, proper suction/discharge treatment can be performed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a nozzle unit for use in a dispensing apparatus, which penetrates a plug body that seals a container, enters the container, and sucks or discharges liquid in the sealed container. .

  2. Description of the Related Art Conventionally, an apparatus for sucking or discharging a liquid in a container that is sealed with a stopper made of an elastic material such as rubber is known (for example, Patent Documents 1 and 2 below). Such an apparatus is usually provided with a nozzle unit having a tip that is sharp enough to be pierced into a stopper of a container, and sucks and discharges liquid through the nozzle unit. By performing suction and discharge while being sealed in this way, it is possible to eliminate the trouble of removing the plug and to prevent dust from entering the container.

Japanese Patent Laid-Open No. 7-83938 JP 2004-3916 A

  By the way, many of the nozzle units provided in such an apparatus are pipe materials having a hollow inside, and the opening that functions as a suction port or a discharge port is often formed at a sharply formed tip. However, when an opening is formed at the tip, there is a possibility that chips are generated when the nozzle unit is pierced into the stopper. If such chips become clogged in the opening at the tip or fall into the container, there is a problem that the subsequent suction / discharge process cannot be performed properly.

  Therefore, an object of the present invention is to provide a nozzle unit that can perform appropriate suction / discharge processing more reliably.

  The nozzle unit of the present invention is a nozzle unit used in a dispensing apparatus, penetrates through a plug body that seals a container, enters the container, and sucks or discharges liquid in the sealed container. A nozzle unit having a tubular body with a sharply formed tip and a liquid passage through which the liquid passes; and the liquid passage is closer to the rear end than the tip. A liquid suction / discharge port is formed on the side surface of the tubular body through the side surface of the tubular body.

  In a preferred aspect, the tube has a double tube structure in which an air passage through which air for air release passes is formed concentrically on the outside of the liquid passage, and the air passage is formed from the suction / drainage port. At the position close to the rear end, the air passes through the side surface of the tube body, and air intake / exhaust ports are formed on the side surface of the tube body. In this case, the lower end height of the air passage is preferably equal to the lower end height of the intake / exhaust port.

  In another preferred aspect, the tip portion has a substantially pyramid shape, and the suction / drainage port is formed between the tip portion and the round bar portion of the outer surface of the round bar portion located above the tip portion. It is formed in the vicinity of a substantially V-shaped ridgeline formed at the boundary.

  Further, the housing is detachably attached to a piping system provided in the dispensing apparatus and holds the tubular body in a detachable manner, and a communication hole is formed to communicate the piping system and the tubular body. It would also be desirable to have a structured housing.

  According to the present invention, the liquid suction / discharge port is formed at a position closer to the rear end than the front end. As a result, even if the nozzle unit is pierced into the plug, generation of chips is prevented, and suction / discharge processing can be performed appropriately.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a dispensing device according to an embodiment of the present invention. As is well known, a dispensing device is a device that dispenses a sample such as a blood sample aspirated from an original sample container into a child sample container and aliquots it. The dispensing device of the present embodiment includes a sharp-tip nozzle unit, and even if the original sample container or the child sample container is sealed with a rubber stopper or the like, the sample is sucked and discharged in the sealed state. Can be done. Hereinafter, this dispensing apparatus will be described in detail. In the following description, a case where the original sample container is sealed will be described as an example.

  The dispensing apparatus of the present embodiment includes a nozzle unit 10 with a sharp tip, a movable part 12 that moves the nozzle unit 10, a piping system (not shown in FIG. 1) connected to the nozzle unit 10, and an original sample container. A transport mechanism 14 that transports 100 and the like, and a control unit (not shown) that controls these are provided.

  The nozzle unit 10 is connected to a piping system, which will be described later, and is detachably attached to the movable portion 12 via a holding mechanism. As the holding mechanism, various configurations can be adopted. In this embodiment, a holding mechanism 40 that holds and holds the nozzle unit 10 as illustrated in FIG. 2 is used. That is, the holding mechanism 40 includes a holding plate 44 that is formed with a substantially U-shaped notch 46 and is rotatably attached to the front frame 42 of the movable portion 12. The width of the notch 46 of the holding plate 44 is smaller than the outer diameter of the flange 72 provided at the upper portion of the nozzle unit 10 and larger than the outer diameter of the tube body 64 extending below the flange 72. Yes. The nozzle unit 10 can be held by the hook portion 72 of the nozzle unit 10 being engaged with the notch 46. Further, when releasing the holding of the nozzle unit 10, the holding plate 44 may be rotated so as to be vertical, and the locking state of the collar portion 72 may be released. In addition, the structure demonstrated here is an example, Naturally, you may use the holding mechanism using other mechanisms, for example, fitting etc., for example.

  Returning to FIG. 1 again, the configuration of the dispensing device will be described. The movable portion 12 is movable along the Y rail 18 extending in the Y direction and the Z rail 16 standing in the Z direction. As a result, the nozzle unit 10 is also movable in the YZ direction. In addition, since the well-known main technique can be used about the moving mechanism of this movable part 12, detailed description here is abbreviate | omitted.

  The transport mechanism 14 is a mechanism that transports the composite rack 22 mounted on the X rail 20 along the X rail 20. In the composite rack 22, a plurality of original sample containers 100, a plurality of child sample containers 102, a cleaning tank 24, and the like are installed. The original sample container 100 is a container for storing a sample collected from a subject, and a stopper made of an elastic material such as rubber is attached to the upper end thereof. In this embodiment, as will be described in detail later, the sample is aspirated from the original sample container 100 without removing the stopper, in other words, with the original sample container 100 still sealed. Here, at the time of this suction process, the nozzle unit 10 with a sharp tip is pierced into the plug body, and when the suction process is completed, the nozzle unit 10 is raised and pulled out from the plug body. During this extraction, the stopper and the original specimen container 100 may be pulled up due to friction generated between the nozzle unit 10 and the stopper. In order to prevent the original sample container 100 from being pulled up, a stopper 26 is provided on the upper side of the original sample container 100 (see FIGS. 1 and 11). The stopper 26 is formed with a nozzle passage hole 26 a smaller than the outer diameter of the original sample container 100, and the original sample container 100 that is going to rise together with the nozzle unit 10 is intended to come into contact with the lower surface of the stopper 26. The rise that does not do is to be inhibited.

  The child sample container 102 is a container through which the sample aspirated from the original sample container 100 is discharged. In this embodiment, a container whose upper end is completely opened is used as the child sample container 102. However, similarly to the original sample container 100, a container sealed with a stopper may be used as the child sample container 102. In that case, similarly to the original sample container 100, it is desirable to provide a stopper for preventing lifting on the upper side of the child sample container 102.

  The cleaning tank 24 is a container used for cleaning the nozzle unit 10, and the inside thereof is divided into a waste liquid part and a cleaning part. In the waste liquid part, the liquid (waste liquid) that is no longer needed is discharged and stored. The waste liquid stored in the waste liquid part is appropriately sent to a waste liquid tank (not shown) and discarded. Further, the cleaning liquid is appropriately sent to the cleaning unit from a cleaning liquid tank (not shown) and stored. The nozzle unit 10 is cleaned by immersing the tip of the nozzle unit 10 in the cleaning liquid stored in the cleaning unit.

  The composite rack 22 holding the original sample container 100, the child sample container 102, and the cleaning tank 24 as described above is positioned in the X direction by the transport mechanism 14. The nozzle unit 10 is positioned in the YZ direction by the movable portion 12. As a result, the nozzle unit 10 can be positioned in three directions XYZ with respect to the composite rack 22. In this embodiment, the composite rack 22 that holds a plurality of types of members is used. However, a dedicated rack may be provided for each member, and each member may be individually positioned.

  Next, the piping system 30 connected to the nozzle unit 10 will be briefly described with reference to FIG. FIG. 3 is a schematic configuration diagram of the piping system 30. In addition, as for the solenoid valve in FIG. 3, all have shown the non-electromagnetic state. In the nozzle unit 10 of this embodiment, as will be described in detail later, a liquid path 80 through which a liquid such as a specimen and a cleaning liquid passes and an air path (not shown in FIG. 3) through which atmospheric pressure release air passes are concentric. It has a double tube structure. In the nozzle unit 10, the first pipe 32 a and the second pipe 32 b are connected to the liquid path 80. The first pipe 32a is connected to the first syringe pump P1 through two electromagnetic valves V11 and V12. The first syringe pump P1 is a pump that adjusts the internal pressure of the liquid path 80 for aspirating and discharging the specimen. The second pipe 32b is connected to the second syringe pump P2 through two electromagnetic valves V13 and V21. The second syringe pump P <b> 2 is a pump for sending the cleaning liquid stored in the cleaning tank 34 to the liquid path 80. In the present embodiment, when the sample is aspirated and discharged, the second syringe pump P2 is driven in advance to send the cleaning liquid to the liquid path 80, thereby cleaning the liquid path 80. The pressurization pump P3 is for sending air to the liquid passage 80 while storing air in the air reservoir 36 in order to dry the inside of the liquid passage 80.

  A third pipe 32c is connected to the air passage. The other end of the third pipe 32c is connected to an air reservoir 36 or the like via an electromagnetic valve V14 so that air for releasing atmospheric pressure can be sent to the air passage as necessary.

  The controller monitors the detected values of the pressure sensors Ps1, Ps2, and Ps3 connected to the respective parts of the pipes 32a, 32b, and 32c, and drives the electromagnetic valves V11, V12, V13, and V14 and the pumps P1, P2, and P3. To control. In addition to the piping system 30, the control unit also controls driving of the entire dispensing apparatus including the movable unit 12 and the transport mechanism 14 described above.

  Next, the nozzle unit 10 used in this dispensing apparatus will be described. In the present embodiment, as described above, the nozzle unit 10 is passed through the stopper mounted on the original sample container 100, thereby realizing sample suction in a sealed state. Therefore, in this embodiment, the nozzle unit 10 having a special form suitable for penetrating the stopper is used. This will be described in detail below.

  4A is a top view of the nozzle unit 10, and FIG. 4B is an exploded cross-sectional view (AA cross-sectional view) of the nozzle unit 10. FIG. FIG. 5 is a cross-sectional view of the nozzle body 60 taken along the line AA.

  The nozzle unit 10 of the present embodiment is broadly divided into a housing 50 that is mounted on the piping system 30 of the dispensing apparatus and a nozzle body 60 that is held by the housing 50. The nozzle body 60 is further roughly divided into a double-pipe structure pipe body 64 and a flange 62 fixed to the upper end portion of the pipe body 64. The nozzle body 60 is detachable with respect to the housing 50, in other words, is appropriately replaceable.

  Here, the structure of the housing 50 that detachably holds the nozzle body 60 will be described with reference to FIGS. FIG. 6 is a partially enlarged view of FIG. FIG. 7 is a sectional view taken along line BB in FIG.

  The housing 50 is a substantially cylindrical member, and first to third connector holes 52a, 52b, 52c to which the first to third pipes 32a, 32b, 32c are detachably connected are formed on the upper surface thereof. Yes. A holding hole 54 into which the flange 62 of the nozzle body 60 is fitted and inserted is formed at the center of the lower surface of the housing 50. The nozzle body 60 is held by being fitted and inserted into the holding hole 54. The first connector hole 52 a and the second connector hole 52 b communicate with the upper end of the holding hole 54 through a communication hole 56 formed inside the housing 50. Further, the third connector hole 52 c communicates with the side surface of the holding hole 54 through another communication hole 58.

  Next, the structure of the nozzle body 60 will be described. As described above, the nozzle main body 60 is roughly divided into a pipe body 64 having a double pipe structure and a flange 62 fixed to the upper end of the pipe body 64. The flange 62 is a cylinder into which the upper end of the tube body 64 is inserted, and is welded to the tube body 64. A flange portion 72 that projects outward is formed at the lower end of the flange 62, and the nozzle unit 10 is mounted on the movable portion 12 when the flange portion 72 is locked to the holding plate. The flange 62 is inserted into the holding hole of the housing 50, and the outer diameter thereof is slightly smaller than the holding hole 54 of the housing 50. A liquid passage communication hole 65 communicating with the liquid passage 80 of the pipe body 64 is formed at the upper end of the flange 62. An air passage communication hole 66 that communicates with the air passage 84 of the tubular body 64 is formed on the side surface of the flange 62. Furthermore, two receiving grooves 68 for receiving the O-ring 70 are formed on the outer surface of the flange 62 so as to be lined up and down across the airway communication hole 66. When the flange 62 is inserted into the holding hole 54, the O-ring 70 accommodated in the accommodation groove 68 is brought into close contact with the inner surface of the holding hole 54 and exerts a frictional force, whereby the housing 50 of the nozzle body 60. Unintentional withdrawal from the is prevented. Further, since the O-ring 70 is in close contact with the inner surface of the holding hole 54, an isolated airtight space is formed around the liquid passage communication hole 65 and the air passage communication hole 66. The liquid passage 80 and the air passage 84 are communicated with the corresponding pipes 32a, 32b, and 32c through the airtight space.

  Incidentally, as is apparent from the above description, in the present embodiment, the housing 50 connected to the piping system 30 and the nozzle body 60 are separable. In other words, the nozzle body 60 can be replaced as appropriate. Therefore, for example, when only one of the nozzle main body 60 or the housing 50 is deteriorated, it is sufficient to replace only the deteriorated member, and the running cost of the dispensing device can be reduced. Moreover, since the nozzle body 60 can be appropriately replaced with a type (shape) corresponding to the shape of the container to be handled, the versatility of the dispensing device can be further improved.

  Next, the configuration of the tubular body 64 will be described with reference to FIGS. FIG. 8A and FIG. 8B are enlarged views of a C part and a D part in FIG. 5, respectively. The pipe body 64 has a double pipe structure in which the liquid path 80 and the air path 84 are arranged concentrically in order from the inside. The tubular body 64 is tapered at a substantially intermediate height, and is roughly divided into an upper large diameter portion 64c and a lower small diameter portion 64b with the taper 64a as a boundary. The outer diameter of the small-diameter portion 64b is sufficiently smaller than the inner diameters of the original sample container 100 and the child sample container 102, and can enter the inside of these containers. A sharp tip 90 having a substantially triangular pyramid shape is provided at the tip of the tube body 64.

  The liquid passage 80 extending in the axial direction from the rear end of the tube body 64 is bent at approximately 90 degrees at a position slightly closer to the rear end than the tip end portion 90, and comes out to the side surface of the tube body 64. . An intake / exhaust liquid port 82 communicating with the liquid path 80 is formed on the side surface of the tube body 64. The position of the suction / drainage port 82 will be described in more detail with reference to FIG. FIG. 9A is a front view of the vicinity of the distal end portion 90 of the tubular body 64, and FIG. 9B is a perspective view of the vicinity of the distal end portion 90. In the tubular body 64 of the present embodiment, a cylindrical small-diameter portion 64b is connected to the upper side of the substantially triangular pyramidal tip portion 90. A substantially V-shaped ridge line K is formed at the boundary between the tip portion 90 and the small diameter portion 64b. The suction / drainage port 82 is provided in the vicinity of the V-shaped ridge line K on the outer surface of the small diameter portion 64b. The reason why the inlet / outlet port 82 is provided at this position will be described in detail later.

  The air passage 84 arranged outside the liquid passage 80 is protruded from the side surface of the tube body 64 at a position closer to the rear end than the intake / exhaust liquid port 82, and an intake / exhaust port 86 is formed on the side surface of the tube body 64. To do. Here, as is clear from FIG. 8A, the lower end of the intake / exhaust port 86 has the same height as the lower end of the air passage 84. With this configuration, even if the liquid enters the air passage 84 for some reason, the liquid is immediately discharged from the intake / exhaust port 86, so that the liquid is prevented from staying inside the air passage 84. The

  By the way, as is clear from the above description, in the present embodiment, the liquid channel 80 is bent so as to avoid the tip 90 on the triangular pyramid, and the tip 90 has a solid triangular pyramid shape. It has become. The reason for this configuration is as follows.

  FIG. 12 is a diagram showing a configuration of a tube body 164 that has been conventionally used frequently. In many of the conventional tube bodies 164, as shown in FIG. 12, the liquid path 180 extends to the tip of the tube body 164, and the tip of the tube body 164 is completely opened. When the tube body 164 is to penetrate through the plug body 101 of the container, the opening portion strongly presses the plug body 101. As a result, a part of the plug body 101 is taken into the opening of the tube body 164. A part of the plug body 101 becomes a chip 110 completely separated from the plug body 101 when the tube body 164 is completely penetrated. The chip 110 causes a problem of blockage of the tube body 164 when it remains in the tube body 164, and causes a problem of contamination of the specimen when it is detached from the tube body 164. Further, in the case of the conventional tube body 164 in which a part of the plug body 101 is completely separated and removed, after the tube body 164 is pulled out, a hole corresponding to chips is opened in the plug body 101. Such a hole in the plug 101 has caused a sanitary problem.

  On the other hand, the distal end portion of the tubular body 64 of the present embodiment has a solid triangular pyramid shape as described above. FIG. 10 shows a state when the tubular body 64 of this embodiment is passed through the plug body 101. As is clear from FIG. 10, when the solid distal end 90 is inserted into the plug body 101, as the distal end section 90 advances, the tear of the plug body 101 gradually spreads and the periphery of the tear is elastically deformed. To go. However, the suction / drainage port 82 which is an opening is formed on the side surface of the pipe body 64 and does not press the surface of the plug body 101. Therefore, chips that are separated and removed from the plug body 101 are not generated. As a result, in the tube body 64 of the present embodiment, the problem of contamination of the specimen due to the blockage of the tube body 164 and the dropping of chips, which has occurred in the conventional tube body 164, does not occur. In addition, although the plug body 101 has a tear, a part of the plug body 101 is not separated and removed. Therefore, no hole is formed in the plug body 101 after the pipe body 64 is pulled out from the plug body 101.

  That is, in the present embodiment, the suction / drainage port 82 is formed at a position where the plug body 101 is not pressed when the tube body 64 is passed through the plug body 101, that is, at the side surface. As a result, it is possible to prevent problems such as generation of chips and formation of holes in the plug body 101 after the tube body is pulled out.

  By inserting the tube body 64 having the above configuration into the original sample container 100 and driving the pump or the like of the piping system 30 in this state, the sample is aspirated (or discharged). Fig.11 (a) is a figure which shows the mode at the time of this attraction | suction operation | movement. When aspirating the specimen, the first syringe pump P1 is driven with the tube body 64 inserted until the distal end portion 90 is located in the vicinity of the bottom surface of the original specimen container 100, and the inside of the liquid passage 80 is set to a negative pressure. To do. In response to this negative pressure, the sample flows into the liquid path 80 from the suction / drainage port 82 and is aspirated. Further, in order to prevent a decrease in the internal pressure of the original specimen container 100 due to the suction of the specimen, the atmospheric pressure inside the original specimen container 100 is released through the intake / exhaust port 86 and the air passage 84.

  Here, depending on the total amount of collected samples, the amount of samples required for analysis, and the like, there are cases where almost all of the samples stored in the original sample container 100 are to be aspirated. In other words, there is a demand for enabling aspiration even when the liquid level of the specimen is low. In order to satisfy this demand, the inlet / outlet port 82 is required to be located as close to the bottom surface of the container as possible. In order to satisfy this requirement, in this embodiment, the suction / drainage port 82 is provided in the vicinity of the substantially V-shaped ridgeline K at the boundary between the tip portion 90 and the small diameter portion 64b (see FIG. 9). Such a position is the position where the distance from the distal end of the pipe body 64 is the smallest among the positions where the plug body 101 is not pressed when the pipe body 64 is passed through the plug body 101. If the suction / drainage port 82 is provided at such a position, it is possible to reduce the level of the specimen that can be aspirated while preventing problems such as generation of chips.

  In addition, providing the suction / drainage port 82 on the side surface brings advantages not only in the case of suction but also in the case of discharge. FIG. 11B is an image diagram showing the state of the discharge operation. As described above, the liquid passage 80 of the present embodiment is bent at approximately 90 degrees at the end and reaches the suction / drainage port 82. Therefore, the specimen discharged from the suction / exhaust liquid port 82 through the liquid path 80 does not fall directly downward, but once collides with the side surface of the container, and then easily falls downward along the side surface. . In this case, it is easy to prevent the bubbling of the specimen accompanying the drop impact. Further, scattering of the specimen accompanying the fall of the specimen can be prevented. That is, by providing the suction / drainage port 82 on the side surface, a more preferable discharge operation can be performed.

  As is clear from the above description, in this embodiment, the distal end portion 90 of the tube body 64 is formed into a solid conical shape, and the suction / drainage port 82 is formed on the side surface of the tube body 64, so It is possible to prevent the generation of chips associated with. As a result, appropriate suction / discharge processing can be performed more reliably.

  The above description is an example, and other configurations may be appropriately changed as long as the distal end portion of the tubular body has a solid structure and the suction / drainage port is formed on the side surface of the tubular body. For example, in the present embodiment, the tip portion 90 has a substantially triangular pyramid shape, but may have another shape, for example, a quadrangular pyramid shape, a conical shape, or a wedge shape as long as the tip portion is sharp. However, in order to form the V-shaped ridge line K at the boundary between the tip portion 90 and the small diameter portion 64b, the pyramid shape is desirable. In the present embodiment, only one intake / exhaust liquid port 82 and one intake / exhaust port 86 are provided, but a plurality of intake / exhaust ports 86 may be provided. That is, a plurality of horizontal holes communicating with the liquid path 80 or the air path 84 may be provided, and liquid or gas may be sucked and discharged through the plurality of horizontal holes. Furthermore, in this embodiment, the housing 50 and the nozzle body 60 are separable, but they may be integrally formed.

It is a perspective view of the dispensing apparatus which is embodiment of this invention. It is a perspective view around a holding mechanism. It is a schematic block diagram of a piping system. (A) is a top view of a nozzle unit, (b) is an exploded sectional view of a nozzle unit. It is AA sectional drawing of only a nozzle main body. FIG. 5 is a partially enlarged view of FIG. It is BB sectional drawing in FIG. (A) is the enlarged view of the C section in FIG. 5, (b) is an enlarged view of the D section in FIG. (A) is a front view of the vicinity of the tip of the tube, and (b) is a perspective view of the vicinity of the tip. It is a figure which shows the mode at the time of making a pipe body penetrate the plug. (A) is an image figure which shows the mode of suction operation | movement, (b) is an image figure which shows the mode of discharge operation | movement. It is a figure which shows the mode at the time of making the conventional tube penetrate the plug.

Explanation of symbols

  10 nozzle unit, 12 movable part, 14 transport mechanism, 30 piping system, 40 holding mechanism, 50 housing, 52a, 52b, 52c connector hole, 54 holding hole, 60 nozzle body, 62 flange, 64 pipe body, 65 for liquid passage Communication hole, 66 Airway communication hole, 70 O-ring, 72 buttock, 80 liquid path, 82 Intake / exhaust liquid port, 84 Airway, 86 Intake / exhaust port, 90 Tip, 100 original sample container, 101 Plug body, 102 Child specimen container, 110 chips, K V-shaped ridgeline.

Claims (5)

A nozzle unit used in a dispensing device, which penetrates a plug body that seals a container, enters the container, and sucks or discharges liquid in the sealed container,
The tip is sharply formed, and has a tube body in which a liquid passage is formed to pass the liquid,
The liquid path passes through the side surface of the tubular body at a position closer to the rear end than the front end portion, and forms a liquid inlet / outlet port on the side surface of the tubular body.
A nozzle unit characterized by that. The nozzle unit according to claim 1,
The pipe body has a double pipe structure in which an air passage through which air for air release passes is formed concentrically outside the liquid passage.
The air passage passes through the tube side surface at a position closer to the rear end than the intake / exhaust liquid port, and forms an air intake / exhaust port on the tube side surface,
A nozzle unit characterized by that. The nozzle unit according to claim 2,
The lower end height of the air passage is equal to the lower end height of the intake / exhaust port. The nozzle unit according to any one of claims 1 to 3,
The tip portion has a substantially pyramid shape,
The suction / drainage port is formed in the vicinity of a substantially V-shaped ridge line formed at the boundary between the tip portion and the round bar portion of the outer surface of the round bar portion located above the tip portion.
A nozzle unit characterized by that. The nozzle unit according to any one of claims 1 to 4, further comprising:
A housing that is detachably attached to a piping system provided in the dispensing apparatus and that detachably holds the tubular body, wherein a communication hole that communicates the piping system and the tubular body is formed. A nozzle unit comprising:

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