DD300484A7 - DEVICE FOR THE AUTOMATIC SUPERSTRUCTURE-CONTROLLED DOSING OF LIQUIDS - Google Patents

Abstract

The device is used for metered filling of fluidizable media by means of a pump drive, z. As for solutions, dispersions, emulsions, especially paints. In a container is the constantly kept at the same level Fuellgut. In Fuellgut a bearing and sealless centrifugal pump is arranged. It has a provided with a stopper drive motor and the pressure side a terminating in a Kruemmer riser with short outlet and consistently the same cross-section. Fig. 1 {dosing; Filling, automatic, conveyor-controlled; Liquids; Centrifugal pump, bearingless, sealless; Driving motor; Stop means; open riser; Manifold; same cross-section}

Description

Field of application of the invention

The device is used for the flow controlled dosing of various flowable media in the viscosity range below about 500m Pa · s by means of a pump drive. It can be used for filling solutions, dispersions, emulsions, ζ. B. in the food industry and in chemistry, especially for paints.

Characteristic of the known state of the art

It is known to produce the flow of the filling material by pumps, which displace cyclically volumes. These are displacer, piston or diaphragm pumps. By means of the same volume-controlled metered.

With the same pumps or others, the amount of filling material in the container can also be metered via a level control via a level control. The characteristic volume control is thus device-oriented, which is referred to as level control used against container-oriented (see, inter alia, Filling for profit by Roberts, TP modem Paint and Coatings-New York 71 | 1981] 5th, p.58-60 ).

On the basis of the displacer piston filling machine principle, the filling machines of the well-known manufacturing company De Vree (Belgium) also work (see, inter alia, By Appointment to the paint industry filling machines by "De Vree" Polym. Paint CoI J. - Reelhill 173 [1983] 4091, pp. 177-178).

Certain "De Vree" piston-type filling machines have a pneumatic drive, which requires a considerable amount of energy, which is exacerbated by the need to overcome considerable friction when conveying non-lubricating media for filling.

Positive displacement filling machines work with inlet and outlet valves (suction and pressure valves). The exhaust valve is located in the Reqel in a filler neck, which directs the filling jet. When the valve is closed in the dead space between the valve seat and outlet regularly remains a larger undefinable Füllgutrest contaminated by dripping and -kleckern the filling station and the container and also causes a Füllgutverlust.

As far as remedial measures are known, they all in principle run on a fixation of Füllgutrestes between the Füiloperationen in the nozzle by an additional cross-sectional constriction addition. By pressing the same still medium, means a further considerable expenditure of energy.

In the case of piston filling machines, the dosing accuracy decreases very rapidly as a result of valve and piston-cylinder wall wear. The liquid product occurs unnecessarily at certain points, pollutes the machine and also causes a loss of product.

In order to compensate for these imminent dosage inaccuracies, the piston filling machine dispenses with the definition of the product volume through the stroke volume and instead proposes a "level fill" with ultrasonic level measurement in the container and circuit of the signal "Filling" on reaching the filling mark on an outlet valve mechanism (cf. ultrasouici accrescouo la precisione velle operation! de riempimento [ultrasound controls increase accuracy in filling procedures] by Euaneler, B.- Pitture e Vernici, Milano [1986] 12, p44-46).

It should be summarized that in all cases to stop the Füllstromas the cross section of the filling line is to bring to zero and so dosing intervals are imposed on the flow of the filling material by valve actuation.

Valves, however, are obstacles in the flow of the filling material, the P jssierung requires additional energy and in which the machine wear begins in principle.

The associated effects can be considerable, the mastery of the difficulties of wear of pumps by abrasive media presents the designer with particular technical problems (cf promotion at high pressure controllable by G. Vetter Chemical Review - Dusseldorf 109 [19861, p.944 -950).

Aim of the invention

The invention has the goal of reducing the energy consumption in the automatic metered filling of low to medium-viscosity liquids wear of the devices and the product losses and to improve the mass-performance ratio of the filling machines.

Explanation of the essence of the invention

The object of the invention is to provide a device which doses controlled flow, generates the flow with less energy and reduces the frictional resistance. Thereby. Cross-sectional constrictions in the piping and conveying system are largely avoided and dripping at the product outlet is reduced to a minimum.

The object is achieved in that in an automatically level-controlled product container, consisting of a Reservoir is fed, a centrifugal pump is arranged in the product, at the pressure side of an ascending filling tube

adjoins with a bend in the summit of about 180 ° C and a downward shorter

Outlet nozzle, which has the same cross section throughout. From the suction side, the Kieiselpumpe is freely accessible. Your impeller is not stored on the pump side, without seal and with a relatively short shaft to the drive motor

connected. Impeller and shaft are easy to dismantle.

The constant level of the contents in the product container is carried out with various methods that can be selected according to the

same characteristics as the dosage of the contents in the container, so that during the Füllop & rations constantly the

Level consistency of the filling material in the product container is maintained. This constant Füllgutniveau in the product container, which includes the suction and pressure side and also in the rising filling tube

is present, the condition is that each filling is given by the start of the same Ausgangsniveaii Füllgutspiegelsim in the filling tube of particular consistency and this is still supported by a constantly sufficient range of products on the suction side, so a constant flow.

The energy to be expended by the filling material metering pump (centrifugal pump) up to the delivery height, from which the filling jet is released freely Container flows, is relatively low. The dosing process can be started without delay. However, it is the realization of the filling

not only to turn off the drive motor but to artificially tip it. This is done by a in the

Sequence control integrated stop circuit. When the filling jet is stopped, then automatically the entire contiguous in filling tube falls Liquid column back to the level of Füllgutbe .äicers due to the effect acting in this direction Saughebereffektes. In order to

the risk of dripping of the filling material from the outlet end is reduced to a minimum, because it remains in the same no undefinable greater fluid residue. Alone on the wall on the outlet side sticking rüllgutrestekönnten still on the same trickle down and drip.

With the device according to the invention, all types of relatively wide-open containers, such as cans, hobbocks, Cans and the like, to be filled. You can also fill bottles with it, if you have the Füllkopfmündung to the bottle mouth

adapts.

Ausführungsbelsplel The invention is irr. explained in more detail below the following embodiment. FIG. 1 shows the metering and filling device, consisting of the package conveyor 13 with drive 6, the package recognition 15

with sensor 1, the centrifugal pump 14 with drive motor 11 and pressure-side riser with filling mouth 17, wherein the

Centrifugal pump 14 is arranged in a product container 16 with constant Füllgutniveau in the medium, and a

connection-programmed control 19.

Figure 2 shows the control, which are constructed for example of electrical or auü pneumatic switching elements If, according to FIGS. 1 and 2, the energy supply 7 is activated, auxiliary energy for control 9 is provided,

transports the container conveyor 13 a container 18 in the sphere of action of the container detection 15. When the sensor for

Container detection 1 detects the container 18, via the path switching 2 and the amplifier 5, the drive of the Container conveyor 6 stopped so that the container 18 comes to a halt below the filling mouth 17. The coasting time of the drive of the container conveyor 6 is shorter than the time required for the centrifugal pump 14 to the Filling of the level in the product container 16 to raise to the level of the filling mouth 17, so that d ^! e filling of a container 18

always begins after its stoppage.

Simultaneously with the start of the centrifugal pump drive 11, the filling program 3 is started. After reaching the Füilmenge is the Füllmengenprogramm 3 via the amplifier 10 of the centrifugal pump drive 11th

stopped. The time required for the demolition of the liquid cross-section of the filling mouth 17 is in the

Start-up delay of the container conveyor 4 programmed. After this time program, the amplifier 5 starts the drive of the container conveyor 6 and transports the filled Container 18 out of the range of action of the sensor 1. This will reset all switching functions. Upon re-detection of a container 18 on the sensor 1, the program described is again brought to expiration. If 18 bottles are used as a container, according to Figure 3, the amplifier 5 of the drive of the container conveyor. 6

concatenated with an additional hold-down 12, which centered the bottle mouths below the filling mouth 17 or the

Dropping the bottles prevented by premature start of the drive of the container conveyor 6.

Claims (1)

Device for automatically conveying flow-controlled metering of liquids by means of a pump drive, characterized in that in a container with a constant level of the contents (16) a bearing and dichtunc ^ losi centrifugal pump (14) is arranged, which with a provided with stopper drive motor ( 11) is connected and on the pressure side has a rising end in a manifold, a uniform o.fenen cross-section having riser (17). For this 3 pages drawings