DE1212344B - Device for cleaning devices in a fluid circuit - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. α .:

AOIj

German class: 45 g - 7/00

Number: 1212344

File number: A 37933 HI / 45 g

Filing date: July 20, 1961

Opening day: March 10, 1966

The invention relates to a device for cleaning of devices located in a liquid circuit, in particular for dairy plants, by means of Different cleaning fluids supplied from storage containers and returned to them Properties with interposed water rinsing, whereby the circuit of the cleaning fluid and the rinse water is controlled by means of a timer.

The daily cleaning of devices or systems that are used to conduct or absorb milk in a dairy and from a heater, heat exchangers, pumps, milk containers, Centrifuges, pipelines, etc. exist, happens today in such a way that strong cleaning fluids be pumped through all devices or systems at the same time, eliminating the previous time-consuming Brushing the inner surface of the device by hand is avoided. Since these devices are now made of stainless Steel, it is now possible to use a nitric acid solution for initial cleaning, whereupon it is rinsed with water. A hot soda solution is then pumped through the system, whereupon it is also rinsed with water.

The highly concentrated solutions used for cleaning are each filled into special containers and carefully collected after cleaning, taking care to ensure that they are through the rinsing water cannot be diluted.

It is already known that the various cleaning periods are automatically controlled by a timer which also controls the shut-off valves in the pipelines. At the transition from flushing with a cleaning liquid to a rinse with water, or vice versa, is activated by the timer does not take into account whether the returned liquid contains so much detergent that it becomes too is to be returned to a storage container, or contains as little cleaning agent (or pure Represents water) that is to be directed to the drain. This means that you go through the timer alone cannot achieve the desired economy in terms of cleaning agents.

It is also part of the state of the art to regulate the flow of liquids using electromagnetic, to use valves controlled by two electrodes. However, such a regulation alone is also sufficient not to solve the problem described.

According to the invention, the problem in question is solved in that the return of the cleaning fluids in the corresponding storage device for cleaning in one
Liquid circuit lying devices

Applicant:

Aktiebolaget Separator, Stockholm

Representative:

Dr.-Ing. H. Ruschke, patent attorney,
Munich 27, Pienzenauer Str. 2

Named as inventor:

Claes Bertil Sjöholm, Malmö (Sweden)

Claimed priority:

Sweden from August 1, 1960 (7415)

container and the flushing water in the drain regulating valves can be selected by the timer and for Actuation can be provided and that the valves depending on the passage of current between known electrodes immersed in the liquid flow of the line can be regulated.

This ensures that only cleaning fluid with sufficient concentration in their corresponding storage container comes in and more dilute liquid or rinse water to the drain goes, while at the same time no cleaning liquid with sufficient concentration through the drain get lost.

Preferably there is a vertically extending valve upstream of the regulating valve in the direction of flow Overflow pipe provided, which is constantly open. This arrangement eliminates the need to attach a additional multi-way valve for the drainage of the flushing water.

The invention is more schematically illustrated below with reference to hand Drawings additionally described using an exemplary embodiment.

Fig. 1 shows a control device according to the invention;

. 609 537/9

F i g. Fig. 2 is a section through an electrode probe;

F i g. 3 shows a circuit arrangement of a cleaning device according to the invention;

F i g. 4 is a sectional view of a valve.

Fig. 1 shows a return line 1 for the cleaning liquid from the devices to be cleaned to container 4. This pipeline contains a T-piece 16 and a T-piece 5 with an overflow pipe 6, the T-piece 5 with both a Drain funnel 7 as well as with a shut-off valve 3 is in connection. This valve is through a Auxiliary force, in the present case compressed air, which is supplied through a pipe 11 and actuates a piston that opens the valve, which is then closed by a spring when the Compressed air is switched off. In the pipeline 11 there is an element in the form of a shut-off valve 10, which is opened and closed by an electromagnet which is energized by a relay 9 is, which in turn is excited by a current source 8, from which current through a variable resistor 14 and an electrode insert 2 via a line 15 and the relay 9 passes. If the Liquid flowing through the supply conduit 1 is sufficiently conductive, i.e., it is electrically conductive. H. when the liquid is sufficiently concentrated, the servo circuit is closed via the relay 9, opens the compressed air valve 10, the compressed air reaches the shut-off valve 3 and opens it. If then the Concentration in pipeline 1 falls below a certain value again, it closes Compressed air valve 10, whereupon a spring in the shut-off valve 3 closes this. Electrically sensitive elements 12 and 13 in container 4 switch off the entire cleaning system if for any reason the container 4 would become empty or there would be a risk of liquid over the upper edge of the container.

F i g. 2 shows, for example, a sectional view of the electrode insert 2 in FIG. 1. In the present case In the case, the two electrodes 2 are insulated by sockets 17 and fixed in a cup-shaped part 18, in which the electrodes are isolated by means of a sealing compound 19, which is by a Bushing 20 and an washer 21 is pressed together. The insulated electrical line 15 is fastened with the aid of a flange 22 to a protective bushing 23 by a hollow screw 24. A nut 25 attaches the cup-shaped part 18 with the electrode insert 2 to the T-piece 16.

Fig. 3 shows, for example, a schematic representation of a fully automatic cleaning system for two different cleaning liquids, namely a nitric acid solution and a soda solution. 4 a denotes the container for the nitric acid solution, and 4 b denotes the container for the soda solution. 3 a, 2 a and 10 a denote the shut-off valve, the electrode insert and the compressed air valve for the nitric acid solution and 3 b, 2 b and 10 δ the corresponding devices for the soda solution. 28 denotes the common circulation pump for these solutions. 26 a and 26 b designate shut-off valves on the suction side of a pump 28 for both cleaning agents. 27 denotes the inlet for flushing water to the system and 26 c the inlet valve for the water to the pump. The valves 3 a, 3 b, 26 a, 26 b and 26 c are switched automatically with the aid of compressed air. This compressed air is fed to the valves via pipes 11a, XIb, 35, 36, 37 and controlled by a timer 34. The circulation pump 28 supplies the cleaning liquids from the respective containers 4 a or 4 b via a pipeline 29 to the devices to be cleaned, which are represented in the drawings by a milk regulating container 30, a milk pump 31 and a plate heater 32. The latter can also be used to heat the cleaning liquids in order to increase their cleaning effectiveness. The compressed air is fed to the timer through a pipe 33. The timer then distributes this compressed air to the various shut-off valves.

The valves 3 α and 3 b are therefore partly controlled by the timer 34 and partly by the electrode insert 2, but the valves 26 a, 26 b and 26 c are only controlled by the timer 34.

Fig. 4 shows the shut-off valves 3, 3a and 3b as well as 26a, 26ö and 26c in section. In this example 38 designates a valve head and 39 a valve stem, 40 a piston which is fixed on the stem together with a sealing ring 41 which is built into a pneumatic cylinder 42 in which a spring 43 tends to keep the valve head in its closed state bring to. If, however, compressed air is supplied through the pipeline 11 and this overcomes the pressure of the spring, the valve disk is lifted from its seat. 44 denotes a nut which is screwed onto the valve stem 38 and enables the valve to be opened by hand if the air supply has failed for any reason. Two sealing washers 45 and 46 with an opening 50 between them are sealed against the shaft or the valve housing by sealing rings 48 and 49. Any liquid that may enter between these disks is drained off via a bore 47 in the valve housing. The cylinder 42 is fastened to the valve housing by a nut 51 and sealed by a sealing ring 52.

When the cleaning is to be performed with only a single cleaning liquid, falling the container 4 b with its interconnecting piping and the valves 3 and 26 b as well as the elements 2 £ b, 10b and lib in Fig. 3 away.

Claims (2)

Patent claims: 1. Device for cleaning lying in a liquid circuit devices, in particular for dairy plants, by means of cleaning liquids of different properties supplied from storage tanks and returned to them with interposed water rinsing, wherein the circuit of the cleaning liquid and the rinsing water is controlled by means of a timer, characterized in that the the return of the cleaning fluids into the corresponding reservoirs (4 a, 4 b) and the flushing water into the drain (6, 7) regulating valves (3 a, 3 b ) can be preselected by the timer (34) and made available for actuation and that the valves (3 a, 3 b) depending on the current passage between known, in the liquid current in the line (1) immersed electrodes (2) can be regulated. 2. Apparatus according to claim 1, characterized in that in the flow direction upstream of the regulating valves (3 a, 3 b) a vertically extending overflow pipe (6) is provided which is continuously open. Considered publications: German Patent Nos. 893 719, 877 681; German utility model No. 1802 455; U.S. Patent No. 2,680,445; "Control Engineering", 1959, No. 4, pp. 118 to 123; "Control engineering practice", 1960, issue 2, p. 61. 1 sheet of drawings