JPH0476417B2 - - Google Patents

Description

Claim 1: A device for dispensing a dosage of liquid, in which the liquid is released by pneumatic action, comprising: a dosing tube 1;
has a dosing tank 14 extending through the bottom of the filling sphere 15 and upwardly within it, the dosing tank 14 having an inlet opening 16 opening into the filling sphere.
and a vent pipe 17 extending upwardly from this inlet opening, and the bottom of the filling bulb 15 is connected by the inlet pipe 2 to a regulating tank 6 having a regulating liquid level 61, set by a level indicator 110. A regulating liquid level 61 is located below the top opening of the vent tube 17 and a level indicator 110 is connected to the signal line 111, the measuring transducer 120 and the line 131.
The control unit 130 is connected via a control line 133 to a compressed air source 7, which is connected to an inlet pipe 71,
An air distributor 8 is connected via a compressed air line 9 to a reservoir 3, which opens into a regulating tank via a supply line 100, and a control unit 130 is also connected via a control line 132 to a drive 140, which 140 is connected to the distribution nozzle 812 of the air distributor 8 by a coupling 141, and the air distributor 8 is connected to the outlet 8
It opens to the atmosphere through 01, and its exit 802
is connected to the compressed air pipe 9 and its outlet 803 is connected to the connecting pipe 4, which connects to its branch 4.
A device characterized in that it is connected via 2 to the borehole 51 of the overpressure regulator 5 and via its branch 41 to the top of the filling bulb 15.

2 A dosing tank 14 with a completely open top is located in the filling bulb 15, the top of the dosing tank 14 forming both the ventilation pipe 17 and the inlet opening 16, and this part of the dosing tank 14 Device for dispensing a liquid dosage according to claim 1, characterized in that the upper part is below the regulating liquid level 61.

3. The level indicator 110 is attached to the filling sphere 15, the supply pipe 100 leading to the reservoir 3 is provided with an overflow part 62, and its upper part 101 is open to the atmosphere, and the inlet pipe 2 is connected to the supply pipe 100. 3. Device for dispensing a liquid dosage according to claim 1 or 2, characterized in that:

4. For metering the dosage of liquid according to any one of claims 1 to 3, wherein the reservoir 3 arranged in the flow channel or in the tank 36 has an opening 35 or a reflux valve or a flap trap 37. Device.

5. The pressure indicator 72 is connected to the inlet pipe 71 which is connected to the control unit 130 via a signal line 134. A device for dispensing the application amount.

6. Liquid supply according to one of claims 1 to 3, characterized in that the supply pipe 100 is connected to a liquid reversal switch 150, which is connected to the control unit 130 via a control line 151. A device for dispensing the application amount.

7. The distribution nozzle 812 of the air distributor 8 with the inlet opening 8123, the through passage 8122 and the opening 8121 is placed in the reference passage 800 such that the opening 8121 of the distribution nozzle 812 is at a distance X from the upper surface of the distribution chamber 8251 of the stator 825. and exits 801-8
11 , the distribution nozzle 812 connects the compressed air source 7 via a sealed cavity 8252 of the stator 825 and the inlet tube 71 .
The dispensing nozzle 812 is connected to the shaft 14 of the drive 140 which is controlled by the control unit 130.
2 by a joint 141, and the control unit 1
Device for dosing a liquid according to any one of claims 1 to 6, characterized in that 30 also controls a compressed air source 7.

8. Inlet opening 812 such that opening 8121 of distribution nozzle 812 is a distance X from stator 825.
3. A moving distribution nozzle 812 of the air distributor 8 having a through passage 8122 and an opening 8121 is movably mounted relative to a stator 825 containing a reference passage 800 and outlets 801-811;
A distribution nozzle 812 is connected to the compressed air source 7 by an inlet pipe 71, and the distribution nozzle 812 is connected to the shaft 1 of the drive 140, which is controlled by the control unit 130.
42 via a coupling 141, characterized in that the control unit 130 also controls the compressed air source 7, for metering the application amount of liquid according to any one of claims 1 to 7. equipment for.

9. According to one of claims 1 to 8, characterized in that the air distributor 8 with a reference channel 800 is connected to the control unit 130 by a reference point indicator 814 and a signal line 135. A device for metering the amount of liquid applied.

10. characterized in that the dispensing nozzle 812 is connected by a coupling 141 to the shaft of a drive (for example of a step motor), the drive having a system for recognizing its shaft position, connected to the control unit 130; Apparatus for dispensing an application amount of a liquid according to any one of claims 1 to 9.

11 Distribution nozzle 812 of air distributor 8 with opening 8121 and outlet 801 of air distributor 8 ~
Device for dispensing a liquid dosage according to any one of claims 1 to 10, characterized in that 811 is designed and arranged to form a radiator.

Description The present invention relates to a device for dispensing a liquid dose, in which the liquid dose is dosed by pneumatic effects.

Due to the increasing technological demands in process automation, chemical and related industry, and mechanical construction, several devices have been developed that meter the amount of liquid applied by pneumatic effect. These devices are simple, accurate and have low susceptibility to technical troubles.

Known devices for dispensing dosages often require complex devices for stabilizing the internal liquid level and cannot be switched on before first use and/or after long periods of non-use. The liquid to be dispensed must sometimes be filled by hand, and air bubbles are often formed when these devices are filled, thereby impairing dosing accuracy and operation. Liquid reservoirs are often limited in size and usually cannot be mounted underneath these devices. To adjust the liquid level in the reservoir,
Often requires complex equipment.

The air distributor required for the dosing device requires various devices for distributing auxiliary pressure means. valve,
Electromagnetically, pneumatically, and otherwise powered systems, such as cam plates and similar devices, are commonly used for this purpose.
These devices include a relatively large number of mechanical parts, seals, etc., which wear relatively quickly and are therefore susceptible to failure, and are difficult and very expensive to maintain. The variety of individual mechanical components required in known dispensing systems is also related to the dimensions of these devices.

The aim of the invention is to overcome the aforementioned drawbacks.

This is achieved by the present invention in claims 1 to 11.
This can be achieved by treating the appropriate part of the body.

The subject matter of the invention will be explained in more detail below by means of schematic embodiments in the drawings.

FIG. 1 shows an overall schematic diagram of the dosing device.

FIG. 2 shows an embodiment of a dosing device with a level indicator integrated into the filling tank.

FIG. 3 shows a dosing device with a liquid reversal switch.

FIG. 4 shows a modified dosing fluid reservoir for extraction from a flow channel or tank.

FIG. 5 shows a modified sump modification with a reflux valve and/or flap trap.

FIG. 6 shows a schematic overall view of the air distributor.

FIG. 7 shows an example of a practical distributor design with a rotating distribution nozzle.

FIG. 8 shows an example of a distributor with a distribution nozzle that moves in a linear direction.

FIG. 9 shows a modified design of the dispensing nozzle and extraction channel with radiator effect.

FIG. 1 shows an overall schematic diagram of the dosing device.

The illustrated dosing device consists of a dosing tube 1 with a top bend 12, an opening 11 to the atmosphere and a bottom bend 13. Above the lower bend 13 there is an opening 11 such that the metering tube 14 is below the opening 11.
is placed on the opposite side. The volume of the dosing tank 14 determines the amount dispensed by the dosing device. The dosing tank 14 has an inlet opening 16 and tapers above the inlet opening 16 to form a vent 17 . The metering tank 14 and its vent pipe 17 are located within the filling bulb 15 . At its lower end, the filling bulb 15 is connected to the inlet tube 2 by an inlet opening 21 . The inlet pipe 2 has a bend 22 at its bottom and opens into the bottom of the regulating tank 6 by means of its connecting piece 23 . The conditioning tank 6 is arranged such that its bottom is below the inlet opening 21. The lower bend 22 of the inlet tube 2 is arranged so low down that the liquid in the inlet tube 2 forms a liquid barrier for the maximum overpressure required for the dosing device. Furthermore, the upper part 101 of the supply pipe 100 is attached to the bottom of the regulating tank 6 , and the top of the regulating tank is attached in such a way that an overflow part 62 opens into the discharge system 63 . The inlet of the overflow part 62 is arranged so as to be below the upper bend 12 of the metering pipe 1. The liquid level in the regulating tank 6 is controlled and for this purpose there is a level indicator 110 on the control liquid level 61.

The control liquid level 61 is located below the upper bend 12 of the dosing pipe 1, below the opening of the vent pipe 17, below the overflow 62, below the branch 41 of the connecting pipe 4 and below the dosing pipe 1. 1 above the inlet opening 16 of 1. The supply pipe 100 has a sealed connection 33 to the reservoir 3 of the dosing liquid D below the level of the bottom of the regulating tank 6.
It enters through. The reservoir 3 only needs to be filled with the dosing liquid D up to the upper surface level 32. A compressed air connection 34 at the top of the reservoir 3 is connected by a compressed air pipe 9 to an outlet 802 of the air distributor 8 . An outlet 801 of the air distributor 8 opens to the free atmosphere, and an outlet 803 is connected to the branch 43 of the connecting pipe 4 . A branch portion 42 of the connecting pipe 4 is connected to a sink pipe 51 of the overpressure regulator 5. The overpressure regulator 5, in one possible embodiment, consists of an open tank 52 filled with auxiliary liquid P and a speakeasy tube 51 with a sink depth A. The connecting pipe 4 is connected to the upper part of the filled spherical body 15 via a branch part 41. The distribution of the compressed air necessary for the operation of the dosing device is effected using a distribution nozzle 812 of the air distributor 8 which is connected to the compressed air source 7 by an inlet pipe 71 . In addition, inlet pipe 71 is connected to a pressure indicator 72 from which signal line 1 is connected.
34 is led to a control unit 130.

The distribution nozzle 812 of the air distributor 8 is connected to the joint 141
It is moved by the drive device 140 through the. The control unit 130 of the complete dosing device is connected to the control line 13.
2 controls the drive 140 and the compressed air source 7 via the control line 133. A level indicator 110 is connected by a signal line 111 to a measuring transducer 120 and to a control unit 130 via a line 131.

The dosing device of the embodiment according to FIG. 1 operates as follows.

Before the first use, the metering pipe 1, the inlet pipe 2 and the conditioning tank 6 are empty. Fill the reservoir 3 and overpressure regulator 5 with the appropriate liquid (D or P). At the start,
Metering pipe 1, filling spherical body 15, inlet pipe 2, connecting pipe 4
, and also the space above the dosing liquid D, to the atmosphere, partly directly and partly via an air distributor 8.

After switching on the metering device, the distribution nozzle 812 of the air distributor 8 is positioned by the control unit using the drive 140 via the coupling 141 opposite the outlet 802. After positioning the distribution nozzle 812, the control unit 130 switches on the compressed air source 7. The overpressure generated by the compressed air source 7 now enters the space above the dosing liquid D via the inlet pipe 71, the distribution nozzle 812, the outlet 802, the compressed air pipe 9 and the compressed air connection 37 of the reservoir 3.

The compressed air source 7 is guaranteed to safely fill the dosing device to the level of the regulated liquid level 61 when the level of the liquid D in the reservoir 3 is between the upper level 32 and the lower level 31. Send overpressure to an area that causes

Liquid level 61 adjusted from reservoir 3 of liquid D
The overpressure required to convey up to 100 ml is inversely proportional to the liquid level in the reservoir 3. Using this, reservoir 3
Check the liquid level in the tank by pressure indicator 72.

When the reservoir 3 is empty and/or the level is below the bottom level 31, the delivered overpressure drops to substantially zero, which is used by the pressure indicator 72 to generate an alarm. I can do it.

The overpressure forces the liquid D from the reservoir 3 through the supply pipe 100 into the conditioning tank 6. A conditioning tank 6 and a filling sphere 1 connected to it by an inlet pipe 2
5 is filled with liquid D. When the level of liquid D in the filling sphere 15 reaches the level of the inlet opening 16 of the dosing tank 14, the dosing tank 14 and thus also the dosing tube 1 are filled. The liquid D entering the dosing tank 14 forces the air in the dosing tank 14 partly through the dosing pipe 1 and into the opening 11 and partly through the vent pipe 17, the branch 41, the connecting pipe 4 and the air Outlets 803 and 801 of distributor 8
through the air into the free atmosphere. This eliminates the formation of air bubbles.

The filling process is carried out in the adjustment tank 6, in the filling spherical body 15.
and continues until the level of the liquid D in the dosing pipe 1 with the sections (dosing tank 14, vent pipe 17) reaches the regulating liquid level 61.

When the liquid level 61 is reached, the control unit 1
30 is activated by the level indicator 110 via the signal line 111, the measuring transducer 120 and the line 131, the control unit 130 switches off the compressed air source 7 via the control line 133 and then the control line 132. via the drive device 140 so that the distribution nozzle 812 of the air distributor 8 occupies a position connecting the outlets 802 and 803 via the outlet 801 with the free atmosphere. This allows the air compressed in the compressed air pipe 9 and the reservoir 3 to escape to the free atmosphere during the filling process. The liquid D therefore flows back from the regulating tank 6, the filling sphere 15, the vent pipe 17, the metering pipe 1 and the inlet pipe 2 into the reservoir 3.

After the filling sphere 15 has been completely emptied, the dosing tank 14 remains filled to the level of the inlet opening 16, and this also applies to the other side of the dosing tube 1.

Once the conditioning tank 6 is completely emptied, the inlet pipe 6 remains filled with liquid D up to the level of the opening of the connection piece to the conditioning tank, thus forming the liquid barrier necessary for further functioning of the dosing device. be done.

After automatic stabilization of the internal liquid level as described above, the distribution nozzle 812 of the air distributor 8 is positioned opposite the outlet 803. Then switch on the compressed air source. Thus, the compressed air generated by the compressed air source 7 passes through the inlet pipe 71, the distribution nozzle 812 and the outlet 803 to the connecting pipe 4.
to go into. Compressed air passes through the branch 42 of the connecting pipe 4 and enters the drain pipe 51 of the overpressure regulator 5, and when it reaches a suitable size, it generates bubbles and the auxiliary liquid P.
and exits into the atmosphere. The action of the overpressure regulator 5 results in a regulated overpressure, the value of which
1 and the specific gravity of the auxiliary liquid P. Examples of overpressure regulators can include membrane regulators, floating regulators, and the like.

Via the branch 41 of the connecting pipe 4, the regulated overpressure acts on the liquid D in the dosing tank 14 of the dosing pipe 1 and also on the liquid in the inlet pipe 2, so that the overpressure A liquid barrier is formed for the This ensures that a certain amount of collected liquid is delivered to the dosing tank 1.
4 through the opening 11 of the dosing tube 1.
The desired amount of liquid D to be pushed out is transferred to the metering tank 14.
and by the adjusted overpressure.

FIG. 2 shows an embodiment of the dosing device in which the level indicator 110 is attached directly to the filling bulb 15. In this embodiment, the connecting piece 23 of the inlet pipe 2
is connected directly to the supply pipe 100 as a branch, the connecting piece 23 is arranged below the inlet opening 21 and the upper part 101 of the supply pipe 100 is above the regulating liquid level 61 and the overflow part 62 It is equipped with The dosing device according to FIG. 2 operates identically to the device according to FIG.

FIG. 3 shows another embodiment of a dosing device with extraction of the dosing liquid D from a pressurized line. In this alternative embodiment, the conditioning tank 6 is filled using a liquid reversal switch 150 connected to the control unit 130 by a control line 151. The liquid reversing switch 150 is connected to the outlet 1 connected to the supply pipe 100.
52, an inlet 153 connected to a pressurized piping system containing liquid D, and an outlet 154 opening to a discharge section 155.
and has. Comparing with the embodiment according to FIG.
In the metering device of this embodiment, the reservoir 3, the compressed air pipe 9 and the outlet 802 of the air distributor 8 are eliminated. With the exception of filling the regulating tank 6 with the overpressure of the compressed air source 7, this dosing device operates identically to the dosing device according to FIG. Control unit 1 such that the passage between inlet 153 and outlet 152 is open.
30 controls the liquid reversing switch 150 via the control line 151, the regulating tank 6 and/or the total dosing device are filled directly from the pressure line via the liquid reversing switch 150. The passage remains open until the filling process is completed and the level of the regulating liquid level 61 is reached. After being activated by the level indicator 110, the control unit 13
0 gives a control command to the liquid reversing switch 150;
As a result, the passage from outlet 152 to outlet 154 is now open, allowing liquid D to flow out of the dosing device. As mentioned above, following the automatic stabilization of the internal liquid level, the dosing device according to FIG. 3 operates absolutely identically to the dosing device according to FIG. 1.

FIG. 4 shows a modified reservoir 3 in which the dosing liquid D can be extracted from a flow channel or from a larger tank 36. At the bottom of the reservoir 3 there is an opening 35 through which the dosing liquid D can enter the reservoir 3. The dimensions of the opening 35 and the recess depth of the reservoir 3 are chosen such that full functionality is ensured when the dosing device is filled as described above.

FIG. 5 shows a modification of the modified reservoir 3 according to FIG. 4, using a flap flap 37 instead of the opening 35.

6 and 7, the air distributor includes a reference passage 800 and symmetrically arranged outlets 801-
It consists of a stator 825 with 811. In the distribution chamber 8251 of the stator 825 that opens to the atmosphere,
There is a rotating movable dispensing nozzle 812.

The distribution nozzle 812 is connected to the joint chamber 8 of the stator 825.
At 253, the drive device 140 is connected by the coupling 141.
It is connected to the shaft 142 of. The drive 140 is mechanically coupled to the stator 825 by a tightening element 826.

A reference passage 800 is connected to an indicator at a reference point 814 using a connecting tube 813. Empty vessel distributor 8
The outlets 801-811 are connected to the point where compressed air is required for distribution.

Distribution nozzle 812 has a passageway 8122 through it with an inlet opening 8123 and an opening 8121 . Cavity 8252 is connected to compressed air source 7 by outlet 815 of air distributor 8 and inlet pipe 71 .

Inlet opening 8 of rotating movable distribution nozzle 812
123 and cavity 8252 are sealed with a seal 824 to other cavities of stator 825. Reference passage 800 and outlets 801 to 811 of air distributor 8
The distribution nozzle 81 is arranged such that the center point of the opening of the distributor nozzle 812 is in the same plane as the axis passing through the center point of the opening 8121 perpendicular to the axis of rotation 8124 of the distributor nozzle 812.
Two openings 8121 are arranged. Distribution room 82
The distance X between the upper surface of 51 and the opening 8121 of the distribution nozzle 812 is determined by the permissible pressure loss, flow rate and amount of compressed air.

For example, an indicator at reference point 814 in one embodiment as a pressure transducer or microphone transmits a signal along signal line 135 to control unit 130.
turn to Control unit 130 connects control line 13
2 controls the drive 140 and via the control line 133 controls the compressed air source 7. The function of the control unit 130 can be determined via a control input 136 by means of a possible overriding system.

FIG. 8 shows a modification of the embodiment distributor having a dispensing nozzle 812 that moves in a linear direction. In this variant, the drive 140 is designed in such a way that the shaft 142 performs a linear movement. In this case, the stator 82 is directed towards the distribution nozzle 812.
5 has a flat top surface. The reference passage 800 of the air distributor 8, the openings of the outlets 801 to 811, and the opening 8121 of the distribution nozzle 812 are spaced apart from each other by a distance of X. In this case, the distribution nozzle 812 is connected directly to the compressed air source 7 by a flexible inlet tube 71 .

FIG. 9 shows a distribution nozzle 81 with a conical opening.
2 and possible embodiments of the outlets 801-811 of the air distributor 8 are shown.

The distributor according to FIGS. 6 and 7 operates as follows.

When switching on the distributor or when necessary, the drive 140 and the compressed air source 7 are switched on. In this startup cycle, compressed air source 7 only delivers enough pressure to activate the indicator at reference point 814 and air distributor 8
It is controlled so that the parts connected to the outlets 801 to 811 are not affected. After being switched on,
Dispensing nozzle 812 is moved via shaft 142 and joint 141. When the opening 8121 of the dispensing nozzle 812 reaches the position of the opening of the reference passage 800 and the indicator at the reference point 814 recognizes a pressure signal, a signal is transmitted by the indicator at the reference point 814 to the control unit 130 via the signal line 135. Given. The control unit 130 thereby stops the drive 140 so that the opening 8121 of the distribution nozzle 812 stops opposite the opening of the reference channel 800 and at the same time the compressed air source 7 is switched off. This startup cycle defines a clear basis for further functioning of the distributor. The desired distribution is accomplished as follows. First, positioning the distribution nozzle 812 at the appropriate outlet 801-811 of the air distributor 8 allows its control command to be transferred to the control unit 1.
30 via control line 132 . Only when the desired position is reached is the compressed air source 7 connected to the control line 133.
is switched on by the control unit 130 and the introduction of compressed air into one of the outlets 801 to 811 of the air distributor 8, which is determined by the control unit 130, begins. air distributor 8
The remaining outlet of is connected to atmosphere.

The distributor of the embodiment according to FIG.
It operates identically to the embodiment described above with reference to FIGS. 6 and 7, except that 12 performs a linear movement instead of a rotational movement.

Distribution nozzle 81 of the air distributor 8 shown in FIG.
2. The embodiment of the reference passage 800 and the outlets 801-811 works on the radiator principle. In this variant, the well-known suction effect takes place, which neutralizes the losses of the distribution medium.

The level indicator mentioned in the example can operate on different principles. For example, it can work with a thermistor, etc. on the principle of photoelectrically determining conductivity, capacitance, and dielectric constant with a float.

The compressed air source can operate according to any principle as long as it is controllable.

The above example shows an embodiment with an air distributor reference passage and 11 outlets. Embodiments with any number of passages are possible.

The air distributor reference point indicator can also operate on other principles, such as photoelectric, electromagnetic, mechanical, etc.

The aforementioned air distributors include valves, flaps, cams,
It can also be designed as a slider or the like or as an air distributor with a motor. Step motors or any other known drive system can be used to move the distribution nozzles of the air distributor, but they must send an approval message regarding their axial position back to the control unit.

The dosing device according to the invention is characterized in that the internal liquid level is automatically and independently regulated, so that a precise dosage can be dispensed from the liquid in the reservoir despite changes in the surface level.

The method of filling and the design of the dosing tank prevent the formation of air bubbles, which makes it possible to accurately meter the minimum application amount.

The dosing device operates reliably from the first time it is switched on, without first having to manually fill the inner part.

The reservoir for dosing liquid is located below the dosing device and can therefore have relatively large dimensions.

The level of liquid in the reservoir can be automatically monitored during each dosing cycle by simple air pressure measurements.

The dosing device allows for dosing liquids from relatively large containers, channels and pressurized piping systems.

The device according to the invention is used in the chemical and related fields in the construction of various devices, in chemical analyzers, filling machines, etc.