DE1773654A1 - Device for the controllable fine washing of laboratory glasses, objects or substances in dehydrated, circulating water of the highest purity (10 to 15 mega-ohms) - Google Patents

Description

DR. EULE DR. BERG DIPL.-ING. STAPF

8 MUNICH 2.H1LBLESTRASSE 2O

-Df. EuIa Dr. Barg Dipl.-Ing. Stapf, 8 Munich 2, HilbleslraSa 20

ni / Kr 17390 _Dotura June 19, 1968

Our sign JJJ - / "- ¹ - Jl ^?« _Qohjm

Lawyer files No. 17,390

Giovanni Oonte
Genova - Quinto / Italy

G-device for the controllable cleaning of laboratory glassware, Objects or substances in softened, circulating water of the highest purity (10-15 mega-ohms).

The invention relates to a device for the controlled fine washing of glassware for scientific work, of objects of various kinds or substances,

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in softened, circulating water of the highest purity (10 - 15 mega-ohms), which is basically due to its Particularly suitable for washing relatively bulky laboratory glassware such as beakers, balloons, cylinders u.dglo stands out.

An apparatus is already known with which objects and substances insoluble or sparingly soluble in water can be finely washed under control, i.e. under Observation of the degree of softening or purity, i.e. by reading off the specific resistance after the washing process of the treated and circulating water, but this device is only for working in closed- ' determined by its own circulatory system, i.e. under lock and key. This The fact that the goods to be washed are placed in a tightly closable container in which exclusively a washing process can be carried out in a closed circuit. It has been shown that the said, under closed circuit apparatus only for fine washing of insoluble or sparingly soluble substances, as well as objects of smaller dimensions such as pipettes and iprovettes.

The stamp of yes-washing of larger objects underneath Control of the degree of purity, however, is unsolved

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remained. By, the present invention now becomes a powerful yet not too large apparatus created, which is able to handle larger objects, and in an extremely satisfactory manner, though the inconvenient placing of the objects in a tightly closable container is no longer necessary.

The apparatus according to the invention consists in principle of a special container, in which the by a synthetic resin ion exchange device, with one or more exchange columns, Treated water is consumed, the columns preferably being exchangeable and with mixed bed filling are provided while the ion exchange device is installed in a lower part of the apparatus, whereby the wash water is recycled and recycled can be done via a motor pump built into the working group.

The system is with a conductivity meter or with another similar control device to measure the resistivity of the water before or after the Washing process equipped. The whole thing is through lines, valves and fittings to connect the individual washing devices or positions completed.

According to a fundamental, due to the much- r-pr _:

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mutual experience developed constructive peculiarities, the apparatus according to the invention is so developed to be able to wash a significant number of glassware at the same time, that the washing process can be carried out openly, i.e. using a relatively small container that does not must be tightly closed. This container is also designed in such a way that delicates can be washed with deionized Water of the highest purity (10-15 mega-ohms) from glassware

φ for scientific work of any kind, i.e. by smaller glassware, such as pipettes and eprovettes, as well as larger pieces of various shapes, such as beakers, Balloons, cylinders, and the like, can be made without difficulty, with the possibility of the appropriate for the individual parts draining washing water and thus the corresponding

i; to control the degree of purity. To-r resultant to achieve such nia, is seen to it that the yield to kontrollie washing water is immediately or at least very passed close to the input of the connected to the conductivity meter electrode cell, wherein said cell ■ is placed o that nioht to it the water draining from the tub of the container, but only the water that is drained directly from the washing positions, can flow because, if the washing water should flow directly to the bottom of the tub and spread over the whole floor, « duroh to inevitably the air coming into joint surface would determine a eu high absorption of 0O ₂ larger old.

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This measure makes it possible to use an open working method instead of a closed one, as was previously the case common to get along. In fact, the absorption of GOp can thereby be kept so low that with this method the specific in a few minutes Resistance of the washing water running off can be brought to values higher than 5 Hega Ohm without any effort. Without this measure it is practically impossible to get a value of To exceed 0.5 mega ohms. Ss is understandable that such a value is decidedly too low to be able to carry out a purity control, while at 5 Mega ohms such can be made with certainty.

You solution according to the invention thus, in particular by their constructive simplicity and by avoiding all the difficulties involved in the process closed container can occur to avoid all previously occurring defects and is therefore the guarantee an extremely reliable and precise control dt Degree of purity of the GHaegargets to be delicately washed.

In the accompanying drawing is an execution part dta devices · according to the invention eohematieoh shown

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Fig. 1 shows an overall view of the embodiment of the device, with the front wall removed for a better understanding of the inner file;

FIG. 2 shows a section along line a-a in FIG. 1

As can be seen from FIGS., The device consists in principle of a rectangular, relatively thin one Plastic material, for example transparent and reinforced polyvinyl chloride or the like. Manufactured box-shaped container 1 with a trough-shaped bottom 2. This The bottom is arranged or welded a little higher, namely in about 1/5 of the total height of the container and is so inclined that all the drainage water to the middle drainage opening 3 »which opens into a lower collecting container 4 flows. The container 4 consists of a bottom S attached to the lower hand of the main container 1 and from an attached at approximately 3/4 of the length of the main container transverse wall 5. The drain opening 3 has a relatively large mouth with a curved neckline attached at the bottom, which is also preferably made of polyvinyl chloride. The mouth is covered by a thermosetting filter disc with a soft one in the middle has a small bore through which a curved tube coming from the electrode cell 7 is tightly guided.

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Said curved pipe protrudes about 10 mm above the perforated logs of the drainage opening 3, eo that in the pipe only that from the drainage pipes 30, 31, 28 to controlling washing positions 20, 21, 27, draining water can penetrate and not that which the floor 2 flowing along. Said drainage pipes can, as further described in more detail, alternately brought into connection with the mouth of the curved tube leading to the cell will.

The protruding part of the curved tube de.r cell is protected by a detachable base plate 29 »with a diameter of about 30 mm and a thickness of 10 mm. This disc has a middle hole used as a seat for alternate connection the tubes 30, 31 and 28 are used.

The electrode cell 7 is made of stainless steel with the aid of a suitable plate and a number of screws Steel attached to the transverse wall 5 of the container 4. The outflow opening of the cell is provided at the top in order to ensure that the electrodes of the cell are always under water stand.

In the cell 7 and two electrodes housed, τοη

where two cables run out under perfect insulation

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pass the mounting plate of the cell tightly and thus the free space 8 under the container 1 and next to the container 4, from where they are led to the conductivity meter, not shown. Through the mounting plate The cell is also guided by a tube 9, which is provided with a curved and downwardly directed end can suck in a recess 10 provided in the bottom of the container 4. The other end of the tube 9 is with provided with a connector and protrudes slightly on the outer side of the mounting plate to the connection by means of a flexible pipe to a pump 11 housed in space 8. The recess 10 in the bottom 6 of the Container 4 has a relatively large opening which can be closed by a threaded pin. This recess has the task of the proper suction by the pump 11 and the pipe 9 of the whole in the collecting tank 4 contained water and on the other hand to give the possibility, if necessary, by unscrewing the tap to completely drain the water from the tank. The flexible pipe that the pipe section 9 connects to the pump 11, must be long enough so that even when the main container 1 is lifted, a special, connection described later can be realized.

The main container 1 sits on a lower, preferably

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made of the same material and with approximately the same dimensions tub 12 of lower height, than that of the main tank.

The tub 12 is open at the top and serves not only as a lower part for the main container 1, but also as a carrier for the Pump 11 and preferably as an accommodation space for the ion exchange column or columns 13 together with the corresponding one flexible connection pipes.

The discharge line 14 of the exchange column 13 is at the top in two directions divided j with one side to the valve 15 and the other to the connection piece 16 leads. Said parts protrude through the bottom 2 of the main container 1 and are attached to it. Through lines 17 and 18, as well through the valve 15 and the Ansohlußstück 16 can Easily share to the respective different washing positions 20 and 21 or to the washing water connections 18a can be connected.

The lower tub 12 is waterproof and can thus all drops and small or larger amounts of water, for Example in ^ aIIe of a management meeting, take up. As a precaution the motor pump 11 is arranged in an elevated position with respect to the bottom of the tub 12.

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The main container 1 sits on an upper edge provided on the inside of the tub 12. So that the pump and the exchange columns can be made easily accessible, the main container can be lifted off or around the axis 19 can be tilted sideways against a suitable stop.

On the bottom of the tub of the main container 1 sits an apparatus 20 for washing the pipettes, as well as a special one Device 21 for washing the test tubes. These two devices are connected to line 18, and via the valve 22, the pipe 25 and the connecting piece 16, or via the pipe 17 and the valve 15. The pipe is extended to the upper 'i' part of the main container 1 and provided with a variety of connections. The valve 22 is at one of these connections for connection via the tube 23 is screwed to the apparatus 20. The other connections, labeled 18a, are used to remove the Washing water for larger glassware, which for this purpose on the special, from the fixed part 26 and the two movable parts 24 and 25 existing intermediate floor, can be placed. By lifting off the moving parts 24 and 25, the lower device 21 is accessible, which means that it can be used at the same time. The apparatus too 20 can, since it protrudes over the intermediate floor 26, be used simultaneously with the other Waecheinriohtungen.

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This apparatus can be provided with a lid and its drain opening can be pulled out via a special one Pipe extension piece 31 »which ends with a 90 ° curve, with the central drain 3 of the tub of the container get connected. The aforementioned extension piece has the task of draining the apparatus alternately with the middle one To be able to connect the mouth of the drain 3 so that the washing water can be passed directly to the cell 7.

The device 21 for washing the test tubes consists in principle of a tub-shaped plastic plate with a rim. A mouthpiece for connecting the tube 17 is provided on one side of this plate. The tub formed in this way has also a raised, perforated base provided with about a hundred holes to accommodate a corresponding one Number of tubes with a suitable diameter, made of relatively stiff plastic material and is on top provided with a pin with a bore of 1 - 2 mm diameter for the spray-shaped discharge of the washing water. on these tubes are placed upside down in the test tubes for washing. Around the raised one carrying the tubes At the bottom there is a matching high rim so that the washing water flows out of the upturned glasses collected and to the side drainage pipe 30, which ends in a 90 bend, can be guided. That in this way

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This collected water offers a small contact surface compared to the air, so that a low CJO ₂ uptake is guaranteed. As soon as all glasses are clean, the wastewater easily reaches specific resistance values of 5-6 mega ohms.

If the quality of the circulating water is to be checked, the device 21 must move in the direction the center of the main container 1 are shifted so that the corresponding drain pipe 30 with associated bend in connection with the middle drain 3 and with the curved pipe opening out at this point, so that the Water is led directly to the cell 7 below. The control of the draining washing water of all built-in Washing devices must be made alternately, since only one cell 7 is provided and of course not at the same time can accommodate the wastewater from several washing positions.

To control the effectiveness of the synthetic resins Exchanger column or columns 13 is a removable pipe extension piece provided with the task of the funnel 27, in a simple manner and directly with one of the connection points 18a of the pipe 18, which supplies the treated water, to be able to connect. The normal values

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the specific resistance of the column or columns 13 preferably used are in the range of 15-20 mega-ohms, if these values fall below 5 mega-ohms, it is advisable to replace the column or columns, because under such Reliable control of the degree of purity is no longer possible, the lower drainage tank is sufficient 4 to be filled with the water to be treated in circulation, add the necessary amount to the main container pour, for example, 20-25 liters or more, according to the size of the plant; Preference is given to preprocessed Water used. The poured water passes through the drain opening 3 directly into the container 4, if then the pump 11 is put into operation and the conductivity meter has been switched on for a first check To make the performance of the column or columns, one can begin with the washing process.

By properly operating the corresponding valves, the amount of water circulating can easily match the consumption of the connected Washing facilities are adapted, which naturally beforehand with the glassware to be delicately washed or substances have been loaded.

Claims

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Claims (5)

Claims Device for the controllable fine washing of laboratory glasses, objects or substances that are usually used are not or only slightly soluble in water, in softened, circulating water of the highest purity (10 - 15 mega-ohms), characterized in that the main housing of the apparatus comprises a container with a trough-shaped basin, wherein this basin has an outlet, under which a waste container with connected motor pump to the running Recovery of the through a built-in synthetic resin ion exchange device supplied with one or more columns, preferably exchangeable and provided with a mixed bed Deionized or demineralized water, provided is, wherein the system is connected to a conductivity meter or another corresponding measuring device Electrode cell is equipped that organs through which the specific resistance or the quality of the circulating Water controls can be provided, using pipes, fittings and possibly Valves that connect the various elements, such as drain water containers, exchange columns or columns upright is obtained, as well as facilities are provided, the painful washing and the purity control of the pickled Glassware is used for scientific work and the like - 15 109884/0312 2. Apparatus according to claim 1, characterized in that the container is open at the top, and that its trough-shaped Bottom is provided with a drainage opening through which the drainage water is arranged directly below Collection container is passed, which is preferably welded to the bottom of the main container. 3. Apparatus according to claim 1 or 2, characterized in that the electrode cell is placed in such a way that the ^ general drain washing water can get, but only that which is to be controlled by one or the other Establishment originates. 4. Device according to one of claims 1 to 3, characterized in that that the electrode cell is attached to a removable plate which in turn is attached to a wall of the lower one Container is attached, namely in connection with the drainage of the tub of the main container, said Cell is provided with an upwardly bent tube, which is centered through the flow opening of the tub of the Main container is led and above by a gewieeee measure protrudes above the bottom of said tub so that the water flowing on this bottom does not enter its mouth can get. - 16 - 109884/0312 5. Device according to one of claims 1 to 4 _f, characterized in that the tube leading to the electrode cell is provided with a stiffening ring on its XeIl protruding above the bottom of the tub, which is created so that it can also serve as a guide seat for a vertical tube , which is provided with a funnel at the top and is guided through the removable intermediate bottom of the main container. 109884/0312