JP4377153B2 - Circulating liquid material discharge device - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a circulation type discharge device that discharges a liquid material that easily settles and settles, such as a liquid mixture (suspension) of a liquid and a solid.
[0002]
[Prior art]
Conventionally, a needle valve known per se has been used to quantitatively discharge a liquid material such as a suspension, but sedimentation / precipitation occurs in the flow path, and satisfactory discharge cannot be obtained. In addition, solid matter that has settled or settled in the flow path may accumulate in the flow path and block the flow path. There was a problem that happened.
Therefore, as a technique for solving the above problems, a technique for applying a suspension by a die coater has been proposed (see Patent Document 1).
[0003]
[Patent Document 1]
JP2002-219399
[0004]
In such a die coater, the liquid supply to the slot die is performed by a branch (three-way valve) from the cycle piping via a liquid pumping mechanism such as a pump or a syringe, and the branch is performed at a portion in contact with the slot die. Thus, relatively good discharge is possible.
[0005]
[Problems to be solved by the invention]
However, at the time of liquid discharge, a part of the valve constituting the three-way valve is closed, the liquid flow stops in the return flow path, and sedimentation / precipitation occurs in the flow path. Even if sedimentation / sedimentation occurs in the return channel, the liquid in this part is not directly discharged, but if sedimentation / sedimentation is repeated, it will accumulate and the channel will become narrower or blocked, Since the desired circulation cannot be obtained, the dispersed state cannot be maintained, and as a result, there is a problem that the discharged liquid is not in the desired dispersed state.
[0006]
Such a problem appears remarkably when one discharge time and non-discharge time are long, and depending on the structure near the valve, precipitation and deposition of solids in the liquid easily occur, and a desired circulation is achieved. There was a problem that it could not be obtained.
[0007]
An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a device for stably discharging a liquid material such as a suspension that easily settles and settles. Provided is a circulation type liquid material discharge device capable of stably discharging a liquid material even when the time and the non-discharge time are long.
[0008]
[Means for Solving the Problems]
As a result of earnest research to achieve the above object, the present invention has a valve structure capable of continuously flowing the liquid material in the loop pipe not only when the liquid discharge is stopped but also during the discharge. By adopting the above, the inventors found out that precipitation / deposition of solid matter in a liquid does not occur even when one discharge time or non-discharge time is long, and the present invention has been conceived.
[0009]
That is, the circulating liquid material discharge device of the present invention is
A container for storing a liquid material, a means for stirring the liquid material in the container, a loop pipe for constantly circulating the liquid material in the container, and a liquid pipe provided in the loop pipe for pumping the liquid material A circulation type liquid material discharge device comprising: a pump, a nozzle having a discharge port, and a valve for opening and closing communication between the loop pipe and the nozzle ,
The valve has a substantially straight flow path extending substantially horizontally that forms part of a loop pipe, and is a valve seat formed on an inner wall surface on the lower side of the flow path, and the vicinity of the valve seat is without positioned lower than the inner wall surface of the flow path of the periphery thereof a valve seat at the lowermost end by remote high level of the inner wall surface of the flow path, furthermore, between the nozzle and the flow path It has a lift valve which opens and closes communication, and has a tip formed to contact the valve seat across the flow path.
[0010]
According to such a configuration, the liquid material can continue to flow in the loop pipe not only when the discharge is stopped but also during the discharge, so that the solid material in the liquid material does not precipitate and accumulate, and is stable. Liquid material can be discharged.
[0011]
In the above circulating liquid material discharge device, the valve includes a substantially straight flow path extending substantially horizontally that forms a part of the loop pipe, and a lift valve that opens and closes communication between the flow path and the nozzle. Since it is configured, it is configured that the liquid material always flows in the loop pipe regardless of opening / closing of the lift valve (that is, discharging or stopping of liquid), so that good discharge can be always obtained.
[0012]
Last deleted [0013]
The valve is a valve seat formed on the inner wall surface on the lower side of the flow path, and the vicinity of the valve seat is located below the inner wall surface of the surrounding flow path, because it has a valve seat on the inner wall surface lowermost end by remote high level, it will occupy the lowermost end by remote high position of the inner wall surface of the flow path position of the valve seat. Therefore, since the solid matter in the liquid does not precipitate or accumulate on the valve seat portion, the following problems do not occur and good discharge can be performed.
[0014]
Deleted last time [0015]
That is, if there is a one-step lower portion on the inner wall surface of the flow path constituting the loop pipe, even if the circulation of the liquid material is continued, the solid matter in the liquid material inevitably settles and accumulates in this lower portion. . When the position of the valve seat is lower than the inner wall surface of the flow path, solid matter settles and accumulates on the valve seat, and when the lift valve is moved away from the valve seat and opened, Since the material flows into the nozzle, the liquid material having a concentration higher than the predetermined concentration is discharged, or the discharge port is blocked by the solid material. The serious problem of not being able to perform the desired valve function by injuring the body is caused, but the present invention can solve these problems all at once by adopting the above configuration.
Also, in the present invention, in the vicinity in which a valve body of the flow channel, it is desirable to provide a dent upwards and / or laterally.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic view showing an embodiment of a circulating liquid material discharge device according to the present invention, and FIG. 2 is a basic structure of a valve structure in this embodiment , that is, a valve seat is formed from an inner wall surface of a flow path in the vicinity. also Ri schematic view showing a case where not located below as a reference example, FIG. 3, Ru schematic view showing one embodiment of a valve structure.
[0017]
The container 12 in which the suspension 10 is stored is placed on a magnetic stirrer 14, and a stirring bar 16 is placed in the container 12.
A stopper 18 is attached to the upper opening of the container 12, and two through holes are provided in the stopper 18 apart from each other, and glass tubes 20 and 22 are attached to the stopper 18 through these through holes, respectively. ing. One end of each of the conduits 24 and 26 is inserted into the glass tubes 20 and 22, and the insertion end of one of the conduits 24 is held so as to be immersed in the suspension 10 stored in the container 12. The insertion end of the other conduit 26 is held so as to be spaced upward from the surface of the suspension 10.
A slight gap is formed between the inner peripheral surface of the glass tubes 20 and 22 and the outer peripheral surface of the pipes 24 and 26, and from the gap according to the decrease of the suspension 10 in the container 12. It is configured to take in outside air.
The other ends of the pipes 24 and 26 are connected to the first opening 32 and the second opening 34 of the circulation valve 30, respectively.
[0018]
A tube pump 36 known per se is provided in the middle of the conduit 24 connected to the first opening 32 of the circulation valve 30, and a nozzle 38 is provided in the circulation valve 30.
The pipes 24 and 26 constitute a circulation path together with the container 12, the tube pump 36 that pumps the suspension 10 in the container 12, and the circulation valve 30.
[0019]
The “tube pump” here is, for example, the type described as “micro pump” in Japanese Utility Model Laid-Open No. 56-129590, and refers to a flexible conduit through which liquid flows. It is known as a device for transferring liquid in a flexible pipe by sandwiching it between a plurality of pressing members and a receiving member and selectively moving the pressing members forward and backward with respect to the flexible pipe. ing.
[0020]
Next, the basic configuration of the circulation valve 30 , that is, the case where the valve seat is not positioned below the inner wall surface of the flow path in the vicinity thereof will be described in detail with reference to FIG.
The circulation valve 30 has a first opening 32 and a second opening 34 communicating with the pipe lines 24 and 26, respectively, and the pipe line 24 is interposed between the first opening 32 and the second opening 34. , 26 is formed in a substantially horizontal direction, and a branch path 35 extending vertically downward is formed in the middle of the flow path 33. The branch path 35 is attached below the valve. The nozzles 38 communicated with each other.
[0021]
A needle valve body 42 is provided at a position corresponding to the opening of the upper end portion of the branch path 35 so as to be reciprocable in a direction orthogonal to the flow path 33. It is formed as a valve seat 40 that receives the tip of 42.
That is, the level of the valve seat 40 can be formed to be the same level as the lowest end of the inner wall surface of the flow path 33 as shown in FIG. 2 (reference example). Then, as shown in FIG. 3, the channel 33 is formed at a position higher than the lowermost end of the inner wall surface. In this case, the valve seat 40 may be formed in a form having a step or may be formed smoothly.
If there is a step in the valve seat 40, even if precipitation occurs in the step portion, it is always circulated, so there is no precipitation more than necessary, and the valve seat 40 is located higher than the step. The precipitated solid matter is not discharged from the nozzle, and the valve seat 40 and the needle valve body 42 are not damaged.
[0022]
The needle valve body 42 is not shown in the drawing so that the tip of the needle valve body 42 can be in contact with the valve seat 40 across the flow path 33 while being sealed through an O-ring 37 provided in the valve body. It is driven by an air cylinder, and its vertical movement is controlled by a valve controller 46.
[0023]
That is, the branch path 35 is closed when the tip of the needle valve body 42 contacts the valve seat 40, while the branch path 35 is lifted when the needle valve body 42 rises and the tip is detached from the valve seat 40. It is configured to be opened.
[0024]
The outer diameter of the needle valve body 42 is formed smaller than the inner diameter of the flow path 33, and even when the needle valve body 42 is in contact with the valve seat 40 and the branch path 35 is closed, the flow path 33 itself is The needle valve body 42 is configured not to be blocked.
[0025]
In this embodiment, it is preferable that the nozzle 38 attached to the valve 30 is short because there are few portions where the liquid stays during non-ejection.
On the other hand, when the nozzle 38 is formed long, it is desirable to discharge the liquid in the nozzle at the time of non-ejection by providing an air insertion port. When the liquid is discharged in this way, it is possible to attach a tube having an appropriate length that communicates with the branch path 35 of the valve 30 and attach the nozzle 38 to the tip thereof.
[0026]
The operation of the circulation type liquid ejection device of the present invention configured as described above will be described.
First, in a state where the container 12 for storing the suspension 10 is placed on the stirrer 14, the stirrer 14 is operated, and the liquid in the container 12 is agitated so that a uniform dispersed state is always obtained. Keep it.
[0027]
By activating the tube pump 36, the suspension 10 in the container is sucked up and refluxed to the container 12 through the first conduit 24, the valve 30 and the second conduit 26.
[0028]
In this embodiment, the suspension 10 in the container 12 is configured to return to the container 12 through the first conduit 24, the tube pump 36, the valve 30 and the second conduit 26. May be circulated in the direction, or may not be always recirculated in one direction, but the direction of flow may be changed in the middle, and the flow direction may be reversed in small increments and reciprocated. .
Moreover, although the tube pump 36 is used for the pressure feeding of the liquid material, the present invention is not limited to this, and a Mono pump or other types of pumps can also be used.
[0029]
When the suspension 10 is not discharged, the needle valve element 42 in the valve 30 is in contact with the valve seat 40 (see FIG. 2A), and its outer diameter is larger than the inner diameter of the flow path 33. Since it is formed small, the suspension 10 can recirculate in the circulation path without blocking the flow path 33 even in such a state.
[0030]
The circulation operation is always performed during discharge and non-discharge, and when it is desired to discharge the suspension 10 from the nozzle 38, the valve control device 46 is operated, and the valve is controlled by an output signal from the control device 46. The needle valve body 42 in 30 is lifted and separated from the valve seat 40, and the flow path 33 and the nozzle 38 communicate with each other via the branch path 35 (see FIG. 2B).
[0031]
As a result, a part of the suspension 10 in the flow path 33 is discharged through the nozzle 38, and the remaining suspension 10 that has not been discharged passes through the second conduit 26 and passes through the container 12. To reflux. Therefore, since the suspension 10 does not stagnate during discharge, separation and precipitation do not occur, and good discharge can always be performed.
[0032]
Furthermore, since the level of the valve seat 40 according to the present invention is formed at a position higher than the level of the lowermost inner wall surface of the flow path 33, the solid matter mixed in the suspension is precipitated and the valve As described above, it does not stay near the seat.
[0033]
As described above, in the present invention, the valve structure has been described in which the suspension is discharged stably in a state where the suspension is mainly refluxed. However, the flow resistance is not limited to the suspension but increases when the flow stops. Even if it is used for a liquid material that does not flow easily even if it tries to flow next, or a liquid material that hardens, it is possible to discharge stably without clogging the flow path.
[0034]
Delete [0035]
Delete [0036]
Further, in the present invention, in the vicinity in which a needle valve body 42 of the flow path 33 constituting the valve 30, with a 48 or 50 dents upward or lateral direction provided, two Doru valve body 42 or valve seat 40 The flow path can be expanded by the amount occupied in the flow path 33 so that the solid matter contained in the liquid material 10 can flow smoothly without being precipitated and staying in the valve 30.
4A and 4B show a reference example formed so that the level of the valve seat 40 is the same as the lowest level of the inner wall surface of the flow path 33. In the embodiment according to the present invention formed so that the level is higher than the level of the lowermost end of the inner wall surface of the flow path 33, the dent 48 or 50 is provided in the upward direction or the horizontal direction in the same manner.
For example, when the valve seat 40 is formed so that the level of the valve seat 40 is the same as the level of the lowermost end of the inner wall surface of the flow path 33, a part of the inner wall surface that is vertically above the flow direction of the liquid 10 If the dent 48 is provided and the level of the valve seat 40 is formed to be higher than the level of the lowermost end of the inner wall surface of the flow path 33, it is on the left and right with respect to the flow direction of the liquid material 10. The dent 50 can be provided in a part of the inner wall surface.
When the position of the valve seat 40 is at a position lower than the lowermost end of the inner wall surface of the flow path 33, such a dent 48 or 50 is settled because the solid contained in the liquid 10 is heavier than the liquid. There is a possibility that the nozzle may clog up and cause problems such as clogging of the nozzle. However, in the configuration in which the dents 48 and 50 are provided in the upper direction or the lateral direction with respect to the flow direction of the liquid material 10 and the flow path is expanded, the liquid material 10 Since the flow in the valve becomes smooth, the circulation of the liquid material 10 in the loop pipe is maintained, and precipitation and retention of solid matter can be prevented.
[0037]
In the above embodiment, the liquid material 10 in the container 12 is agitated by the stirrer 14 and the stirrer 16. However, the present invention is not limited to this, and means that can substantially uniformly agitate the liquid material 10 like a stirring blade. If it is.
[0038]
The needle valve body 42 of the valve 30 is driven so as to reciprocate in the vertical direction by, for example, an air cylinder, but is not particularly limited as long as it can be reciprocated. In addition to air, it can be driven by a spring, magnetic force, motor or the like.
[0039]
【The invention's effect】
As is apparent from the above description, according to the present invention, the liquid can be kept flowing in the loop pipe not only when the discharge is stopped but also during the discharge. Precipitation / deposition can be prevented and good liquid ejection can be performed stably.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an embodiment of the present invention.
2 is an enlarged cross-sectional view of a main part showing a basic configuration of the valve in FIG. 1 (a reference example in which a valve seat is not positioned below the inner wall surface of a flow path in the vicinity thereof) .
3 is an enlarged cross-sectional view of a main part showing an embodiment of the valve in FIG . 1. FIG.
FIG. 4 is an enlarged cross-sectional view of a main part showing a modified example in which a dent is provided around the flow path of the valve, and the level of the valve seat is shown in the basic configuration.
[Explanation of symbols]
10 Suspension 12 Container 14 Stirrer (stirrer)
16 Stirrer 18 Lid 20, 22 Glass tube 24 First pipe 26 Second pipe 30 Circulating valve 32 First opening 33 Channel 34 Second opening 35 Branch path 36 Tube pump 37 O-ring 38 Nozzle 40 Valve seat 42 Needle valve body 46 Valve control device 48 Recess 50 Recess

Claims (2)

A container for storing a liquid material, a means for stirring the liquid material in the container, a loop pipe for constantly circulating the liquid material in the container, and a liquid pipe provided in the loop pipe for pumping the liquid material A circulation type liquid material discharge device comprising: a pump, a nozzle having a discharge port, and a valve for opening and closing communication between the loop pipe and the nozzle,
The valve has a substantially straight flow path extending substantially horizontally that forms part of a loop pipe, and is a valve seat formed on an inner wall surface on the lower side of the flow path, and the vicinity of the valve seat is without positioned lower than the inner wall surface of the flow path of the periphery thereof a valve seat at the lowermost end by remote high level of the inner wall surface of the flow path, furthermore, between the nozzle and the flow path A circulation type liquid material discharge device comprising: a lift valve that opens and closes communication and has a tip formed so as to cross the flow path and contact the valve seat. The circulating liquid material discharge device according to claim 1, wherein a dent is provided in an upward direction and / or a lateral direction in the vicinity of the valve body of the flow path.

Images