JP5356906B2 - Liquid metering and filling equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid measuring and filling device capable of preventing the leakage of organic gas into a chamber by instantly closing a pressure reduction chamber with a float when measuring is concluded, succeeding a conventional favorable point that a sliding mechanism is not used in consideration of using an organic solvent which generates highly inflammable volatile gas. <P>SOLUTION: A pressure reduction chamber 11 is divided into: an upper part 11u provided with a gas flow-in/out pipe 13 and having the inner diameter formed equal to the outer diameter of the float 20 so that the float 20 can move; and a lower part 11d formed larger than the outer diameter of the float 20 and communicating with a liquid measuring part 21 through a communication hole 22 and formed with a guide projection 24 for guiding the float 20 to the upper part 11u at the inner peripheral surface thereof. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a liquid metering and filling device for metering and refilling an organic solvent into a refilling can of an organic cleaning agent used for cleaning, for example, an automobile repair shop or general machinery.

  Highly flammable liquids such as alcohol and acetone are used as organic cleaning agents used for cleaning automobile repair shops and general machinery. A metering pump B as described in Patent Document 1 has been proposed as one refilling device. In FIG. 5, the main part is extracted.

  This metering pump B has a structure that does not have a mechanical sliding part to measure the highly flammable organic solvent L. Specifically, the metering pump B uses a venturi action by introducing pressurized air to reduce the pressure inside. An air introduction unit 1 for forming a region, a reduced pressure chamber 3 communicated with the air introduction unit 1 in a reduced pressure state via a suction path 2 and decompressed by the air introduction unit 1, and an organic solvent from a storage tank (not shown) A cylinder portion (not shown) provided with a suction port (not shown) for sucking the solvent L and a discharge port (not shown) for discharging and filling the measured organic solvent L into a refill can (not shown). And a communication pipe 4 that connects the decompression chamber 3 and the cylinder portion, and a float (floating element) 5 disposed in the decompression chamber 3. By introducing pressurized air into the air introduction portion 1, And the inside of the cylinder is depressurized, thereby measuring the liquid from the suction port. A highly flammable organic solvent L such as alcohol or acetone is sucked into the inside, and the sucked organic solvent L is further introduced into the decompression chamber 3 through the communication pipe 4 so that the float 5 floats and the suction path 2 The organic solvent L, which is a certain amount of flammable liquid, is sucked and held by this, and the inside of the decompression chamber 3 is released from the decompressed state by stopping the supply of pressurized air to the air introduction unit 1. The organic solvent L, which is a flammable liquid in the cylinder portion, is discharged from the discharge port and filled into the refilling can.

  Although this method is excellent for sucking and metering the organic solvent L, which is a highly flammable liquid without a mechanical sliding portion, the blockage of the suction path 2 by the float at the time of metering is caused by Since the high flammable organic solvent L rises due to decompression and floats due to the rise of the water level and adheres to the O-ring 6 provided in the opening of the suction path of the float 5, as shown in FIG. When the float 5 with its lower part sinking into the L comes into close contact with the O-ring 6, the organic solvent L is sucked into the suction path 2 from the slight gap 7 between the O-ring 6 and the float 5, and the air introduction part There is a problem that an odor of organic gas which may be discharged into the room (in the room) from the exhaust port (not shown) of the air introduction unit 1 in the form of liquid or spray through the air 1 may enter the room.

JP 2006-299840

  Therefore, in the present invention, while inheriting the preferable point of the conventional example in which a sliding mechanism is not used in handling an organic solvent that generates highly flammable volatile gas, the decompression chamber is instantaneously floated (floating) when measurement is completed. The problem is to prevent the organic solvent from leaking into the room as well as the organic solvent itself.

The liquid metering and filling apparatus A according to claim 1 is:
(1-a) A liquid meter that is connected to the pressure switching device 30 and sucks a predetermined amount of the liquid L to be weighed when the pressure switching device 30 is depressurized, and discharges and fills the liquid L to be filled into the filling container 17 when it is not depressurized. In filling device A,
(1-b) Connected to the pressure switching device 30 via the gas inlet / outlet pipe 13 provided in the ceiling portion 12, and the float 20 that moves up and down with the level of the liquid L to be weighed is housed inside. A decompression chamber 11;
(1-c) A liquid suction pipe 16 for sucking the liquid L to be weighed and a liquid L to be weighed by sucking and weighing the liquid L to be weighed is provided under the decompression chamber 11 through a partition wall 23 having a communication hole 22 formed therein. And a liquid metering unit 21 provided with a metering liquid filling pipe 19 for discharging and filling the container 17 for filling.
(1-d) The decompression chamber 11 is provided with a gas inlet / outlet passage 13, and the inner diameter thereof is larger than the outer diameter of the float 20 and the upper portion 11 u formed so that the float 20 can move and is equal to the outer diameter of the float 20. The lower portion 11d communicates with the liquid measuring portion 21 through the communication hole 22 and has a guide protrusion 24 formed on the inner peripheral surface for guiding the float 20 to the upper portion 11u .
(1-e) The float 20 has a hemispherical head 20a on the ceiling 12 side and a cylindrical or hollow sphere with a barrel 20b.
(1-f) The height to the ceiling surface of the upper portion 11u of the decompression chamber 11 is larger than the radial height of the hemispherical head 20a when the float 20 is a shell type, and in the case of a hollow sphere. It is characterized that you have formed larger than the radius for the outer peripheral surface.

A second aspect of the present invention relates to the shape of the float 20 of the liquid metering device A according to the first aspect, wherein the interior of the float 20 is formed in a hollow state.

  In the liquid metering and filling apparatus A of claim 1, the decompression chamber 11 is divided into an upper part 11u and a lower part 11d, the inner diameter of the upper part 11u is formed equal to the outer diameter of the float 20, and the lower part 11d is the outer diameter of the float 20. Since the guide protrusion 24 for guiding the float 20 to the upper portion 11u is formed on the inner peripheral surface thereof, the liquid L to be weighed flows into the decompression chamber 11 due to the reduced pressure, and the float 20 is moved to the upper portion 11u. The outer peripheral surface of the float 20 coincides with the inner periphery of the lower opening edge of the upper portion 11u and attempts to enter the upper portion 11u (this time is when the measurement is completed). Since the gap t between the opening 11 and the inner periphery of the lower opening edge of the upper portion 11u is very small, it is closed, so that only a very small amount of air flows into the upper portion 11u from the gap t. Pressure cut off compared to slight air inflow Due to the large amount of suction by the device 30, the degree of decompression in the upper portion 11u is rapidly increased together with the suction, and the float 20 is rapidly sucked into the upper portion 11u, and the gas inlet / outlet portion 13 that opens to the upper portion 11u is instantaneously closed, Of course, not only the liquid L to be weighed but also the scent of the organic gas from the upper portion 11u is shut off almost simultaneously with the completion of the metering, so that almost no organic gas leaks into the room.

  If the float 20 is formed in a bullet shape as in claim 2, when the straight portion 20c on the side surface of the float 20 is drawn into the upper portion 11u, the proximity length with the inner peripheral surface of the upper portion 11u becomes longer. As compared with the case of the hollow sphere, the portion is more completely closed. Further, the long straight portion 20c causes the float 20 to move up and down accurately without fluttering in the decompression chamber 11.

Longitudinal sectional view of the device of the present invention during liquid suction Longitudinal sectional view of the main part of the device of the present invention during liquid suction Longitudinal sectional view of the main part of the device of the present invention in the liquid suction completion state Cross-sectional view of the decompression chamber of the apparatus of the present invention Cross section of the main part of the conventional example

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. The liquid metering and filling apparatus A has a hollow cylindrical filling device main body 10, and includes a main body upper part 10a in which a decompression chamber 11 is formed and a main body lower part 10b in which a liquid measuring part 21 is formed. They are separated and connected in an airtight manner via an airtight O-ring 25.

  The decompression chamber 11 in the main body upper part 10a has an open bottom surface, in which the float 20 is housed. The bottom surface of the opening is covered with a partition wall 23 having a plurality of communication holes 22, and the float 20 is closed. It is crowded.

  The interior of the decompression chamber 11 is divided into an upper part 11u and a lower part 11d. A suction pipe portion 27 is bored in the ceiling portion 12 of the upper portion 11u, and the inner diameter of the upper portion 11u is formed in a state where the float 20 is movable and has a very small gap from the outer diameter of the float 20. Yes. A closing O-ring 26 is fitted into the ceiling opening edge of the suction pipe portion 27.

  The lower part 11d has an inner diameter larger than the inner diameter of the upper part 11u and is formed concentrically with the upper part 11u (therefore, both the upper part 11u and the lower part 11d are circular in cross section), and has a predetermined interval on the inner peripheral surface thereof. A plurality of guide protrusions 24 are provided in parallel with the axial direction of the lower portion 11d. An inner circumferential circle connecting the tips of the guide ridges 24 is equal to the inner diameter of the upper portion 11u, and the float 20 can smoothly move between the upper portion 11u and the lower portion 11d. The height of the upper part 11u to the ceiling surface is larger than the radial height of the hemispherical head 20a when the float 20 is a shell type, so that the entire head 20a of the float 20 is accommodated in the upper part 11u. It has become. When the float 20 is a hollow sphere, it is larger than the radius with respect to the outer peripheral surface.

  A partition wall 23 is attached to the lower surface of the lower portion 11 d, and a plurality of communication holes 22 are formed in the partition wall 23. The formed communication holes 22 are concentrically larger than the outer diameter of the float 20. It is arranged between the guide protrusion 24 and the outer diameter of the float 20 and between the adjacent guide protrusions 24.

  In the embodiment shown in the figure, the float 20 has a bullet shape in which the head portion 20a is hemispherical and the trunk portion 20b is cylindrical, and the outer surface (straight portion 20c) of the trunk portion 20b is straight and the inside is It is formed in a hollow state and the lower surface is open. The outer surface of the trunk portion 20 b is a straight line parallel to the central axis of the float 20. Of course, the shape of the float 20 is not limited to such a shell type, but an appropriate shape as the other float 20 such as a hollow sphere or a vertically long rotating body is selected although not shown. In addition, it is preferable that the material of the float 20 or the liquid metering and filling apparatus A is formed of a metal material that is not affected by an organic solvent. Further, it goes without saying that the bullet-type float 20 may have a hollow lower surface closed shape instead of the lower surface opening.

  A cavity having an upper surface opening is formed in the main body lower part 10 b, and this part becomes the liquid measuring unit 21. And the check valve 15 is provided in the bottom part 14 or through the pipe | tube like a figure. A check ball 15 a is accommodated in the check valve 15. If necessary, it may be pressed in the closing direction by a spring (not shown). A liquid suction pipe portion 16 is attached to the tip of the check valve 15, and the tip is inserted into the liquid storage container 28.

  Further, a metering liquid filling tube portion 19 is provided at the lower side of the main body lower part 10b, and the tip of the metering liquid filling pipe part 19 is connected to the container 17 to be filled so as to fill the organic solvent L which is the metered liquid to be weighed. ing. A discharge side opening / closing valve 18 is provided in the middle of the metering liquid filling pipe portion 19.

  In this embodiment, the pressure switching device 30 is of a known configuration that utilizes the venturi action. Of course, the pressure switching device 30 only serves to bring the decompression chamber 11 into a decompressed state, so a decompression source connected to a decompression device such as an exhaust pump may be used.

  Hereinafter, the pressure switching device 30 will be briefly described. The inlet-side nozzle portion 31 having the inlet-side nozzle hole 31a whose cross-sectional area gradually decreases from the inlet toward the back, and the outlet side of the inlet-side nozzle portion 31. And an outlet side nozzle portion 32 having an outlet side nozzle hole 32a that gradually increases in cross-sectional area from the tip to the inlet, and has a small cross section outlet of the inlet side nozzle hole 31a. A gap 33 is provided in a portion of the outlet side nozzle hole 32a facing the small cross-section inlet portion 32a, and a through hole 34 is formed in the gap 33. The through hole 34 and the upper portion of the main body of the liquid metering and filling apparatus A are provided. The suction pipe part 27 of 10a is connected by the communication pipe 35, and the gas inlet / outlet pipe line 13 is constituted by the through hole 34, the suction pipe part 27 and the communication pipe 35.

  When the pressurized air is supplied to the pressure switching device 30, the pressure is reduced when the vicinity of the inlet side nozzle hole 31a, including the opposing part of the small section outlet part 31a of the inlet side nozzle hole 31a and the small section inlet part 32a of the outlet side nozzle hole 32a, is decompressed. Region P is formed. A pressure pipe 36 is connected to an inlet of the inlet side nozzle portion 31 of the pressure switching device 30, and an inlet side opening / closing valve 37 is installed therein.

  The liquid L to be weighed may be any liquid, but here, organic solvents for cleaning such as automobiles and machines are targeted.

  Next, the operation of the present invention will be described. The tip of the liquid suction pipe line 16 of the liquid metering and filling apparatus A is inserted into the liquid storage container 28, the tip of the metering liquid filling pipe part 19 is connected to the container 17 to be filled, and the discharge side on-off valve 18 is closed. In this state, when the inlet side on-off valve 37 of the pressure switching device 30 is opened and pressurized air is supplied to the pressure switching device 30, a decompression region P is formed inside by a well-known venturi action, and the decompression connected thereto. The air in the chamber 11 is drawn and the inside of the decompression chamber 11 is rapidly decompressed. Due to this depressurization, the liquid measuring unit 21 communicating with the depressurization chamber 11 through the communication hole 22 is also rapidly depressurized.

  At this time, the float 20 has its own weight larger than the suction force by the airflow discharged through the gas inlet / outlet pipe 13, so the float 20 is not sucked up and remains stationary on the partition wall 23. Therefore, the air in the liquid metering unit 21 flows along the passage 24 a (FIG. 4) between the communication hole 22 and the guide protrusion 24, the head 20 a of the float 20, passes through the gas inlet / outlet tube unit 13, and the pressure switching device 30. And gradually increase the degree of decompression. When the pressure difference from the atmospheric pressure applied to the organic solvent L in the liquid storage container 28 becomes larger than the weight of the check ball 15a, the check ball 15a of the check valve 15 is moved to the organic solvent in the liquid suction pipe 16. The organic solvent L is sucked into the liquid measuring unit 21 from the liquid storage container 28 by being lifted up by L and floated.

  As the pressure in the liquid metering unit 21 and the decompression chamber 11 increases, the water level of the organic solvent L in the liquid metering unit 21 gradually increases, and finally enters the decompression chamber 11 through the communication hole 22. As the water level (liquid level) in the decompression chamber 11 further rises, the float 20 finally moves away from the partition wall 23 and rises toward the ceiling portion 12.

  When the head 20a of the float 20 that has risen as the water level rises enters the upper portion 11u of the decompression chamber 11, and the barrel portion 20b reaches the lower opening edge of the upper portion 11u, the inner diameter of the upper portion 11u and the outer diameter of the barrel portion 20b are inserted. Since they match in a removable state, the lower surface opening edge of the upper portion 11u is closed by the body portion 20b (FIG. 2). A gap t between the body portion 20b and the lower surface opening edge of the upper portion 11u is such that the body portion 20b is inserted into the upper portion 11u with almost no resistance. Then, the narrow upper portion 11u in a state where the entire head portion 20a of the float 20 has entered the upper portion 11u of the decompression chamber 11 (FIG. 3) is rapidly decompressed by the suction of the pressure switching device 30, and the float 20 is instantaneously moved into the upper portion 11u. Then, the head 20a of the float 20 closely adheres to the closing O-ring 26 fitted in the opening of the suction pipe portion 27 by suction, and closes the upper portion 11u. This stops the rise of the water level and the measurement is completed.

  Next, when the on-off valve 37 on the pressurized air side of the pressure switching device 30 is closed and the discharge-side on-off valve 18 of the liquid metering unit 21 is opened, air enters the pressure switching device 30 and this enters the gas inlet / outlet portion 13. Enter to atmospheric pressure. On the other hand, since the inside of the upper portion 11u is in a reduced pressure state, the float 20 is slightly separated from the closing O-ring 26 due to the pressure difference. Then, the air in the gas inlet / outlet pipe portion 13 enters the upper portion 11u through this slight gap and increases the internal pressure. As a result, the pressure that pushes down the liquid L to be weighed in the decompression chamber 11 and the pressure to push up the liquid L to be weighed in the liquid storage container 28 are equal to each other, and the force that pushes up the liquid L to be weighed becomes zero. As a result, the check ball 15a of the check valve 15 sinks, the liquid suction pipe 16 is closed to stop the backflow of the liquid L to be measured into the liquid storage container 28, and at the same time, the discharge side opening / closing valve 18 is opened. The liquid to be weighed L in the liquid metering unit 21 is discharged from the metering liquid filling pipe line 19 and filled in the filling container 17.

A Liquid metering and filling device L Liquid to be weighed t Clearance 11 Decompression chamber 11u Upper part 11d Lower part 12 Ceiling part 13 Gas inlet / outlet line 16 Liquid suction line 17 Filling container 19 Metering liquid filling line 20 Float 21 Liquid metering part 22 Communication Hole 23 Partition 24 Guide protrusion 30 Pressure switching device 33 Gap

Claims (2)

(1-a) A liquid metering and filling device connected to the pressure switching device, for sucking a predetermined amount of the liquid to be weighed when the pressure switching device is depressurized, and discharging and filling the liquid to be weighed into the container for filling when the pressure is not depressurized. ,
(1-b) a decompression chamber that is connected to a pressure switching device via a gas inlet / outlet pipe provided in the ceiling, and in which a float that moves up and down with the level of the sucked liquid to be measured is housed,
(1-c) It is provided under the decompression chamber through a partition wall having a communication hole, and is used for filling by discharging a liquid suction line for sucking the liquid to be weighed and a liquid to be weighed by suction. A liquid metering section provided with a metering liquid filling line for discharging and filling the container,
(1-d) The decompression chamber is provided with a gas inlet / outlet pipe, the inner diameter of which is movable and the upper part formed to be equal to the outer diameter of the floating element, and larger than the outer diameter of the floating element. It communicates with the liquid metering unit and is divided into a lower part where guide ridges that guide the float to the upper part are formed on the inner peripheral surface ,
(1-e) The float has a hemispherical head on the ceiling side and a cylindrical or hollow sphere with a cylindrical body.
(1-f) The height to the ceiling surface of the upper part of the decompression chamber is formed larger than the radial height of the hemispherical head when the float is a cannonball type, and in the case of a hollow sphere, liquid metering filling device characterized that you have formed larger than the radius for the outer peripheral surface. The liquid metering and filling device according to claim 1, wherein the inside of the float is formed in a hollow state.

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