DE1974895U - DEVICE FOR PREPARING A SOLUTION. - Google Patents

Description

Patent Attorneys fiirfyVPW R * 1 ξ $ £ 7 15-9 Patent Attorneys fiirfyVPW R * 1 ξ $ £ 7 D? Pl.-Ing. R. Beetz and i.H. J * 3 Γ ΣΠ O * I 3rd J. O / Dipl.-! Ng, Lamprecht Munich 22, Steiri3doffstr. 10

Commissariat a l'Änergie Atomique, Paris (France ^

Device for preparing a solution

The furnace refers to a device for preparing a solution by mixing the components Losungsbe in certain proportions. This device is intended especially in the field of medicine for feeding artificial kidneys

The new device in accordance with the requirements allows one or more artificial heres with a solution of precisely defined composition and temperature, these values being kept constant with a very high degree of accuracy, even if Sudden changes in throughput of the solution to be used occur because of the number of devices connected to the device artificial kidney is suddenly changed *

The solution to be prepared is generally prepared starting from a concentrated solution that is in the device is diluted by mixing with mineral-free water

410-B.2082.3-LGT (7)

term measure allows a relatively long period of operation in a continuous sequence without undesirably large amounts a prepared solution must be available at the beginning of the work. The new device is still like this designed to be perfectly tight or sealed so that the prepared solution will not be contaminated by foreign matter can be.

Of course, the possible uses of the device according to the invention are by no means restricted to the special, above-mentioned field of work limited. In contrast to this, the possible applications also include all cases in which the throughput a solution must be able to change, but the composition and the temperature of the solution must remain exactly constant have to.

The present innovation allows the ones outlined above To meet conditions, thanks to the use of two interconnected vessels to receive the solution, which is immediate are in connection with each other and in each of which separately on the one hand the heating of the solution and on the other hand the withdrawal or drainage to the devices to be fed takes place.

The device for preparing a solution according to the innovation is essentially characterized in that it has a device

for feeding each of the constituents of the solution to be prepared in certain proportions into a heating vessel which with a stirring device for stirring the solution, a heating device for heating the solution to a certain temperature and an overflow is provided which into a reservoir opens, the walls of which are kept at the specified temperature and from which the solution can be taken *

According to a preferred embodiment, the device for feeding has at least a first and a second chamber with dimensions that are adapted to the proportions of a first and a second mixed component and one each at the same time alternately from one to the other side of their respective chambers displaceable pistons containing the relevant chamber divided into two variable volumes, and a distributor that allows each of the Volume of the first chamber with a pressure feed line for the first component and the other with a feed line to connect to the heating vessel, and each of the volumes of the second chamber with a storage container for the second solution component and the other with a supply line to the heating vessel.

To explain the innovation in more detail, a special embodiment of the device according to the invention is now used for

Prepare a solution described, which is illustrated in the drawing is. In the drawing show:

Pig. 1 shows a schematic representation of the device parts built into the device housing (not shown in particular) in an extended position for the purpose of a clear presentation of your sections;

Fig. 2 shows a section along the line A-A of the Pig. 1; Pig. 3 shows a section along the line B-B of the Pig. 2;

Pig. 4 shows a variant of a distribution device according to Pig «2»

The two cylindrically shaped vessels 1 and 2 are installed close to one another in the housing G, which is not shown to scale and in. normal operation with the finished, diluted solution filled, which is intended to feed a number of artificial kidneys. These artificial kidneys are not in the drawing shown. The vessels 1 and 2 are directly connected to one another in their upper area by an overflow line 3, through which the solution can overflow from the vessel 1 into the vessel 2 as the solution flows out of this vessel 2. The ready-to-use solution is removed from the vessel 2 by means of a pump 4 and the artificial one through the line 6 Kidneys fed

The vessel 1 is fed via a line 7, into which the metering pump 8 contains concentrated solution from the storage container

and demineralized water under positive pressure from the line 12 feeds in certain proportions.

- The vessel 1 forms the "heating vessel ¹¹ and is provided in its interior with a cylindrical shielding wall 13, which extends at a distance from the outer vessel walls from a level slightly above the G-efäßbodens to a level below the overflow line 3 such that the solution can circulate freely between the outer space around the shielding wall and the inner space inside this shielding wall. A propeller 14, which is arranged in the saw of the lower end of the shielding wall inside the latter and is driven by a motor 15 associated outside the vessel, causes a revolution of the solution in the vessel 1 which is rising inside the shielding wall and falling outside the shielding wall.

Outside around the shielding wall 13, an electrical heating resistor 16 is arranged at its lower section, which is used for heating serves the solution. The electrical power supplied to this heating resistor is automatically dependent in a manner known per se regulated by the solution temperature, which inside the shielding wall 13 by a probe, not shown, or a ! Temperature sensor is measured; in this way the temperature can be kept at a constant value. The feed or supply line 7 opens tangentially into the cylindrical vessel 1,

so that thereby an intimate mixture of the cold, newly introduced and only premixed Iosungs constituents with the already heated solution is favored in the annular space between the outer vessel walls and the inner shielding wall 13 down flows.

The vessel 2 has no puncture with respect to the heating of the solution itself, which has already been brought to the desired temperature in the vessel 1. This vessel only forms a Storage jar. Its relatively large volume ensures, on the one hand, that the artificial kidneys are properly fed, for example when an error occurs in the drive of the metering pump 8 and, on the other hand, gives rise to the effects of sudden changes in the flow rate the solution to be used on the temperature of this solution ineffective. The vessel 2 is provided with an agitator 18 which is driven by the motor 19 and its paddles at their circulation pass through window-like cutouts in vertical partitions 20, which are intended to allow the mixing to favor.

The vessel 2 is provided with external means to keep its walls at the fixed temperature of the solution to be used to keep; the solution in this vessel cannot heat up any further, but it cannot cool down either.

In the illustrated lall these facilities consist of

a heating bandage 22 which surrounds the vessel 2 and a thermostat control for setting and maintaining the temperature. Optionally, the two vessels 1 and 2 can be placed in the same housing be built-in, in which the temperature is constantly kept at a value that corresponds to the desired temperature value of the solution is equivalent to"

The solution extraction pump 4 is provided with a bypass or circulation with a pressure relief valve, the overpressure limited in line 6 for feeding the eggs. The excess solution is through this circulation line or the in this line seated pressure relief valve fed back into one or the other of the two vessels; in particular, here present case into the vessel 2

Conductivity sensors not shown or similar measuring devices are built into the device; they are used to check the quality of the demineralized water in line 12 on the one hand and the properties of the diluted solution supplied to the urine via the pump on the other hand. The feeding of the vessel 1 with concentrated solution and demineralized water in suitable proportions is carried out by means of the metering pump 8, which is in the lig. 1 on a much larger scale than the vessels is shown to show their details more clearly.

The pump 8 used is a reciprocating pump, since these pumps have lower leakage or leakage losses have as circulating pumps. The pump consists of a housing 24 in which two cylindrical pump chambers 25 and 26 are provided, the dimensions of which are adapted to the respective proportions of the components of the solution to be mixed. Everyone this pump chamber contains a displaceable piston 27 or * 28. The two pistons are connected to each other by the common Piston rod 29 coupled.

A distributor, to be described in more detail below, serves to divert each of the two into the pump chamber 25 through the piston to connect limited volumes alternately with the supply line 12 for the demineralized water. If one of the volumes is connected to the line 12, the same distributor connects the other volume with the line 7 into which the liquid is pushed in from this room. Likewise, the manifold 30 allows each of the pistons to be alternated to connect volumes delimited from one another in the pump chamber 26 to the storage container 10 for the concentrated solution, while the other volume is then also connected to the line 7 and its contents are conveyed into this line.

A cylindrical body or adjusting bolt 32 that is inserted into a the cover 35 is screwed in, which at the ends of the ar-

office rooms are attached, it allows, with effect for both Working spaces 25 and 26 to limit the path of the piston and to define this path in such a way that the throughput of the pump can be set or changed. In order to avoid any contamination, a small proportion of the solution component, which is introduced into the volume adjacent to the cover 33, let into the cavity 34 within the cover 33.

The distributor 30 shown in Figs. 1 and 2 is a distributor with a rotatable cock plug, it has a housing 36 united with the housing of the metering pump 8, in which two coaxial cavities 37 and 38 of frustoconical shape are provided, the common axis of which is parallel to The axis of the working spaces of the pump 8 runs; the two cavities 37 and 38 are symmetrical to one another. In each of these cavities one of two cock plugs 40 and 41 are arranged, which have the same truncated cone shape as the corresponding cavities. These chicks are coupled to one another via an Oldham coupling 21; they are driven via a Maltese cross drive (not shown) and the drive shaft 42.

On the side opposite the drive shaft 42, the distributor has elastic members to hold the chicks firmly against the conical ones To press the walls of the corresponding cavities and thus achieve a tight seal. These elastic organs

stand from a spring 44, which strives to a ball 35 to press the back of the plug 40, lin channel 46 allowed continue to push demineralized water into the hollow receptacle in which the spring 44 sits. This elastic means make it possible to avoid "liquid slugs", which could occur, for example, when the piston of the pump is at its end their path of movement are suddenly stopped

The cock plugs 40 and 41 have a total of four pairs of approximately circular segment-shaped groove cuts, as shown in FIG. 3 indicates. The cuts of the same pair are symmetrical relative to a diameter plane of the cock plug and the floor boundaries running along the chords of the cross-sectional circles of the plug of the incisions of the first pair 48 are parallel to the bottom boundaries of the incisions of the third pair 49 and perpendicular to the bottom boundaries of the cuts of the second pair 50 and the fourth pair 52. In the each pair of cuts In a corresponding transverse plane, the housing part 36 has channels which open into the cavities 37 or 38.

The channels which open into the cavity 37 are the channels 54 and 55 which connect to the supply line 12 of the demineralized pressurized water are in communication, the channels 56 and 57, which are intended with the line 7 for draining into the vessel 1 and the channels 59 and 60 (Fig. 1) run perpendicular to the above-mentioned channels, and from which

in each case one on one or the other side of the piston 27 opens into the working chamber 25 of the pump. In the cavity 38 lead to a number of corresponding (unspecified) Channels, which in a corresponding manner with the reservoir 10 of the pump or with the line 7 and finally are connected to the working chamber 26 of the pump.

The mode of operation of the distributor 30 is already evident from the preceding description, so that it seems superfluous to explain the method of operation in detail »One recognizes in particular in Fig. 3 * because when the cock plug rotates line 60 connected to the pump can optionally be connected to:

a) with the channel 55, so that a transition of the demineralized Water from the line 12 in the direction of the pump takes place j

b) with the line 57, which then allows this water to be pushed further from the pump into the heating vessel 1.

Optionally, you can use a distributor with valves, also attached to the metering pump 8, like him is illustrated in FIG. This distributor contains a camshaft 61 inside the housing part 58, which during their rotation actuates four pairs or groups of valves, which are located in four different planes. For example be the valves 63 and 64 (FIG. 4) are lifted alternately from their seat by means of the tappets 65 and 66 in order to remove the one leading to the pump

Channel 59 either with the supply line 12 for the demineralized Water or to connect to the line 7 for feeding the vessel 1 via the channel 67 «

These Yentile also allow the line 12 and the Yorratsbehälter 10 in the appropriate cycle with the cavities or to connect working spaces of the pump 8.

The device just described is also with all the settings and controls as well as the necessary operational safety necessary devices equipped. In particular, temperature monitoring is provided in each of the vessels. The vessel 1 also contains several liquid level probes; a probe for regulating the level controls the and switching off the dosing pump. There is also a probe for the highest level, a probe for the lowest level and an alarm probe provided near the lower end of the vessel.

Claims (7)

Protection claims 1. Device for preparing a solution by mixing the components of the solution in predetermined proportions, in particular a device for feeding artificial feces, characterized by a metering device (8) for feeding each of the constituents of the respective solution to be prepared in certain proportions into a heating vessel (1), which is provided with a stirring device (14, 15) for stirring the solution and a heating device (16) for heating this solution to a certain temperature and an overflow (3) through which the solution flows into a storage vessel (2), the outer walls of which are provided with devices (22) for maintaining the same temperature and are connected to the means (4, 6) for removing the solution. 2. Apparatus according to claim 1, characterized in that the heating vessel (1) and the storage vessel (2) are arranged in a common housing (G), the internal temperature of which is on the specific Temperature value can be maintained. 3. Apparatus according to claim 1, characterized by means for measuring the conductivity of the solution produced. 4. Apparatus according to claim 1, characterized in that the metering device for introducing the solution components at least a first and a second pump working space (25, 26) sums, the dimensions of which correspond to the respective proportions of a first and a second component of the solution to be mixed are adapted and each contain a movable piston (27, 28) which divides the working spaces into two variable volumes that the two pistons at the same time alternately from the one or the other of its two working space ends can be driven and a distributor (30) for the solution components is provided is that alternately each of the volumes of the first working space with a pressure supply line (12) for the first solution component and the other volume connects to a line (7) for sliding into the heating vessel (1) and each of the volumes of the second working space with a storage container (10) for the second solution component and the other volume with the line (7) connects to slide into the heating vessel, 5 «device according to claim 4, characterized in that the Working spaces (25, 26) are provided with devices (32) for limiting the piston strokes. 6. Apparatus according to claim 4, characterized in that the distributor (30) is a distributor with rotatable cock plug (40, 41), which are preferably rotated via a Maltese cross drive 7. Apparatus according to claim 4, characterized in that the distributor is a valve distributor with cam-controlled valves (61, 63, 64, 65, 66) (Fig. 4).