FI69411B - REGLERINGSANORDNING FOER EN TVAETTNINGSANLAEGGNING - Google Patents

Description

L „ANNOUNCEMENT

jttg M (11) UTLÄGG Nl NGSSKRIFT 6941 1 (45) (51) Kv.lk.4 / lnt.CI.4 B 08 B 3/00 FINLAND— “FI NL AN D (21) Patent application * - Patentansöknlng 751368 (22 ) Date of application - Ansökningsdag 08.0 5.7 5 (FO (23) Starting date - Giltighetsdag 0 8.0 5.7 5 (41) Has become public - Blivit off en tl ig 17.11.75

National Board of Patents and Registration Date of publication and publication— j 1 .λ or

Patent and registration authorities' 'Ansökan utlagd och utl.skriften publicerad -5 *' ^ (32) (33) (31) Pyydetty etuoikeus — Begärd priority 16.05.7 ^

Sweden-Sweden (SE) 7 ^ 06518-6 (71) Electrolux Cleaning Equipment Aktiebolag, Box 127, Ämal, Sweden-Sweden (SE) (72) Sten Anders Runeson Hansen, Ämäl, Sweden-Sweden (SE) (7 * 0 Berggren Oy Ab (5 * 0 Control unit for washing equipment - Regulation of the control system for washing equipment)

The present invention relates to a control device for a washing apparatus having a plurality of flushing openings and a plurality of pumps connected thereto via a pipe connection.

Fixed units of the type described are used for cleaning apartments in the food and slaughterhouse industry and for cleaning cars and the like, whereby liquid, such as water, is sprayed under high pressure through a mouthpiece against the surface to be cleaned. In order to achieve a good cleaning result, it is most often necessary to introduce the detergent into the liquid, which is done by spraying at the pipe connection which passes into the mouthpiece. This occurs with a fluid flow that is less than the maximum fluid flow from the mouthpiece. The injection can be flexibly controlled by a valve that regulates the flow before the mouthpiece. The valve can be set to act on a pressure-sensitive member in the event of a rapid closure, which further opens the valve leading to the detergent tank, whereas in the case of a slow closure the valve causes only a reduced flow through the mouthpiece.

6941 1 2 Such equipment usually uses a number of flushing openings located at different points in the apartment, which may be connected to a common mains and pump. However, the pump must be dimensioned for a flow corresponding to the maximum flush at all flush points. When the efficiency of the flushing points varies greatly, the capacity of the pump will not always be utilized. The system also causes a fault in the pump to cause an interruption in the fluid supply to all flush points. In order to adjust the capacity of the main line to the actual discharge amount, it has been proposed to use several pumps. However, this arrangement has involved drawing the electrical wires to the mouthpieces, which becomes relatively expensive when the wires are routed through damp spaces, requiring measures to be taken to insulate the wires in a satisfactory manner. It has also been proposed to use a first line between the first pump and the first flushing point, and a second line between the second pump and the second flushing point, etc. However, this also requires high installation costs. For example, U.S. Patent 3,133 28? a device of the type mentioned in the introduction is known, in which, however, due to the absence of the main line return line, the installation becomes complicated with its numerous pressure relief valves.

In order to reduce and simplify the known systems, the present invention is mainly characterized by what is stated in the appended claim 1.

The invention will be described in more detail below with reference to the accompanying drawing, which schematically shows a control device for a system with a single pipe, this pipe taking care of several flushing points without using electric wires at the flushing site itself.

As can be seen from the figure, the number 10 denotes flushing points provided with hoses 11 and flushing nozzles 12. Each nozzle includes a tap 13 for controlling both the amount of liquid flowing through the nozzle and the spraying of detergent. The detergent is discharged from tank 1H and injected into the pipeline to the mouthpiece. The drawing shows four rinsing points, but it is of course possible to change the number of rinsing points arbitrarily. For each flushing point mixture, the main

II

a connection 16 leaving the line 15, which is connected to the hose 11 via a sprayer 17.

3 69411 The main line 15 is connected via a pipe connection 18 to a number of pumps 19 connected in parallel, the number of which is primarily the same as the number of flushing points. The pumps receive a constant flow when connected. Each pump communicates with line 20 in a reservoir 21 that holds a certain amount of fluid. The tank can be connected to the water supply network via a line 23, for example via a valve 22. The purpose of the tank is to prevent the liquid from being absorbed back into the water mains if there is a vacuum here for some reason.

From the main line 15, a return line with a discharge valve 25 and a flow monitoring device 26 runs back to the tank 21. At a certain adjustable pressure, the liquid in the main line is allowed to flow through the return line.

The main line is further provided with a pressure regulator 27 which is connected via an electrical connection to an electrical unit in the form of a phase relay 28. An electrical line 29 from the flow monitoring device 26 is also connected to this relay. The relay operates in such a way that each signal from the pressure regulator causes the cam wheel or the like to move forward, which starts the pumps in succession via the electrical connections 30. Each signal from the flow monitoring device causes the pumps to be switched off in succession in a corresponding manner.

The flow monitoring device 26 is adjusted to send a signal to the phase relay 28 in the event of a flow exceeding a certain limit, while the pressure regulator detects the pressure in the main line 15 and sends a signal when the pressure falls below a certain adjustable value.

Both the pressure regulator 27 and the flow monitoring device 26 use time-determined delays to prevent the phase relay from switching on more pumps than necessary or from disconnecting or closing the pump during a shorter interruption during flushing.

Furthermore, the pumps can be equipped with thermostat control and the tank 21 with level control. Thermostatic control prevents overtemperatures and level control prevents the pumps from running dry. The thermostat and level control are connected in series with each other and cut off the voltage to the phase relay monitoring device.

11 6941 1

The combination works as follows.

When one or more taps 13 are opened, the pressure in the main line 15 decreases. · This is indicated by a pressure regulator which signals the phase relay, whereby the cam wheel moves one phase forward, closing the microswitch or the like. This in turn starts one of the pumps. If the flushing nozzle does not provide the entire amount of liquid transferred by the pump, the pressure in the main line 15 increases, whereby the discharge valve 25 opens and allows the unused liquid to flow through the return line. The flow monitoring device 26 transmits a signal only when the flow through the return line 24 is approximately equal to the capacity of the pump, i.e. when the flow through the flushing mouthpiece is relatively small. If such a signal is signaled to the phase relay, the camshaft travels back one phase, thus closing the pump. If the pressure after connecting the pump is constantly too low, for example because two mouthpieces are fully open, one more pump will be connected to the combination, etc.

For example, assume that the pumps have a capacity of 12 liters / min and that the flow monitor is set to send a signal when the flow through the return line exceeds 10 liters / min. It is further assumed that the detergent can be fed by spraying and that this occurs at a flow rate of up to 4 liters / min. For example, opening four flush taps causes the pressure regulator to send four pulses and connect four pumps for a total of 48 liters / min. At full flow, this amount is evenly distributed among the four rinsing nozzles. If the flow through a flushing nozzle is reduced, the discharge valve opens and the flow monitoring device measures the flow rate. However, spraying detergent at the flush point causes all pumps to run continuously with a flow through the return line of 8 liters / min, which is below the limit at which the flow monitor gives a signal. However, if spraying were to take place at two points, the flow through the return line would rise to 16 liters / min, causing the pump to shut off and the flow through this line to then drop to 4 liters / min. When spraying takes place at the three flushing points, the flow through the return line rises to 12 5 69411 liters / min, whereby the second pump is switched off and the flow through the return line decreases to zero. If the spraying also takes place at the fourth flushing point, this only causes the flow through the flow monitoring device to rise to 8 liters / min. If the spraying then stops at a flushing point and the amount of liquid coming from this point increases to its maximum value, the discharge valve closes and the entire flow is directed towards this flushing point. If the amount of flushing liquid is increased at another flushing point, the pressure in the main line decreases, whereby the pressure regulator gives a signal and the relay reacts so that one additional pump starts, etc.

The invention is not limited to the described application example, but variations are possible within the scope of the inventive idea according to the appended claims.

j.

Claims (5)

6 6941 1 Control device for a washing installation with a plurality of flushing openings (12) and a plurality of pumps (19) connected to them via a pipe connection (15), characterized in that the pipe connection (15) comprises a discharge valve (25) and a flow control device (26) provided with a return line (24) and on the other hand a pressure regulator (27) which, together with a flow monitoring device, e.g. via a phase relay (28), controls the closing and disconnecting of the pumps (19) so that the addition of liquid pumps leads to additional pumps (19) switching on in sequential order, while reducing the output from the flushing openings leads to switching off the pumps in sequential order. Device according to claim 1, characterized in that the pressure regulator (27) is arranged to send an impulse to the relay (28) when the pressure in the pipe connection (15) falls below a certain level, so that each impulse starts the pump. Device according to one of the preceding claims, characterized in that the flow monitoring device (26) is arranged to send impulses to the relay (28) when the flow exceeds a certain predetermined value, the pump (19) being closed by each impulse. Device according to Claim 2, characterized in that the pulses of the pressure regulator (27) and / or the flow monitoring device (26) include a time-determined delay. Device according to any one of the preceding claims, characterized in that the return line (24) is connected to a tank (21) from which the liquid for the pumps (19) is taken.