SE448610B - MIXING DEVICE - Google Patents

Description

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CT * Cš \ S) 2 pressure drop. This pressure drop between points 20 and 21 is the active pressure, by means of which the admixture is forced into the carrier liquids at 21. Mixers of this basic structure, namely consisting of a venturi with orifice and an upstream outlet for producing the active pressure, are known. A channel 23, here referred to as guide bore, connects the outlet 20 to the annular space 17, so that the pressure at the outlet 20 also prevails in this space 17. Between the points 20 and 21 the channel 24 contains a valve 25 for the carrier liquid, which valve functions as an automatic shut-off valve. It will be described in more detail below.

On the surface 11, which faces the container 14, 16, the plastic body 10 has a perforated plate 26, which has the shape shown in the drawing, i.e. starting from the places lying at the edge, where the plate is attached to the plastic body 10 and radially inwards, the plate moves away from the surface 11, so that a space 27 is enclosed. The possible shapes and also the type of holes in this plate are based on its purpose. The surface 11 has on its two enclosed surface 26 the opening, namely an orifice 28 for a channel 29, which forms a connection to a filling opening 30 and the outlet 31 for the admixture, from which a channel 32 leads to the orifice 21. In this channel 32 there is a non-return valve 33 and a metering valve 34. All these channels and valves are located in the body 10. In addition, the body 10 contains an automatic aeration valve 35 in an aeration channel 43, which connects the space 17 to the outside air. The valve 25 consists of a valve body which moves to close the valve towards the valve seat 36 in the flow direction of the carrier liquid, so that the valve body closes off the pressure which drives the flow, unless further forces affect the valve body. For operating the valve, however, a rigid connection is arranged by means of a valve rod 37 to a guide piston 38. This guide piston also sits in the body 10 and faces one of its front surfaces 39 towards the space 27 and is therefore affected by the pressure in this space. At its periphery, the piston 38 is sealed to the housing 10. The opposite surface 40 of the piston communicates hydraulically with the channel 24 below the valves 25 and 36. The surface 39 is larger than the surface enclosed by the ring seal 41 of the valve 25 when the valve is closed. against the valve seat 36, so that at equal pressure in the space 27 and in the upstream part of the channel 24 the valve is raised and open due to the difference in size between the effective surfaces.

A In order for the displacement liquid branching off from the carrier liquid to be able to leave the annular space 17, a tap 42 is arranged in the lower part of the container 14. For the following description, a filled, ready-to-use device is used. The space 16 is then filled. with admixture liquid, for example foaming agent (or also any disinfectant or cleaning liquid), and the tap 42 is closed.The carrier liquid is assumed to be water to which the agent is to be mixed.The operation of the heating is started by connecting the inlet 18 to the water source with Through the upper branch of the channel 24, the water, respectively the water pressure, comes to the valve 25, and over the control bore 25 to the annular space 17.

The pressure in the space 17 propagates via the liquid-filled spaces 16 and 27 to the surface 39 of the guide piston 38. Even if the valve 25 were closed, it will now be opened, because its two effective surfaces, determined by the surface 39 and the seal 41 , is affected by equal pressure, so that the direction of movement of the valve is determined by the larger surface area (here 39). Via the rod 37 the valve body 25 is thus lifted up, whereby the passage from the inlet 18 to the outlet 19 becomes free. The flowing liquid reaches the effective pressure, and foaming agent is forced out through the space 27 into the channel 32 by the water which at 20 enters the space 17. The foaming agent enters the water stream at 21 and is thus mixed in here. During this process, there is essentially equal pressure on both main surfaces of the guide piston. »When the admixture has been consumed, the membrane 15 abuts against the perforated plate 26. A further narrowing is thus impossible and the pressure in the space 27 is built up to a pressure reduced by the active pressure. This pressure also affects the piston surface 39, while its opposite surface 40 is still exposed to the full water pressure. The guide piston thus moves towards the space 27 and thereby takes the valve body 25 with it by means of the rod 37 until the latter closes tightly. When the membrane abuts against the perforated plate, i.e. when the admixture has been substantially pre-hooked, the device is automatically switched off in this way. To make the device ready for operation again, it must first be refilled. To do this, the outlet tap 42 is opened and admixture is let into the space 16 through the filling opening 30 which is closed during operation, however, the space 16 can be filled as much as the container 14 allows, i.e. until the rubber membrane 15 comes into contact with the inner wall of the container. . Through the aeration valve 35, air located between the container and the membrane can flow out, so that a smooth, pulsation-free operation is guaranteed.

The check valve 35 prevents water from the channel 24 and

Claims (5)

-lë- 4 :. CD 610 4 22 penetrates into the admixture. the valve 25, 36, 41 can also be controlled by a correspondingly arranged and formed diaphragm instead of by the ether piston 38. With the new device a water stream can be mixed up to 5% of a liquid additive. The water flow is preferably between 5 and 30 1 / m. The metering valve 34 allows stepless adjustment of the admixture, which is independent of the magnitude of the flow stream. All functionally important devices are located in the body or head 10. At its flange edge 12, very different sized containers can be connected. Only equal design of the flange is required. Containers with volumes between 5 and 15 1 are preferably used. Due to the automatic shut-off valve 25, incorrect dosing is excluded. o Patent claims: An active pressure mixing apparatus, with a storage container (14), which is divided by a rubber-elastic separating membrane (15) into a storage space (16) for a liquid to be mixed and a narrowing space (17), with a passage channel ( 24) for a carrier liquid, with an outlet (20) connected to the constriction space (17) on the passage channel (24) and with an orifice arranged in the passage channel (24), which is located downstream of the outlet (20) and has a connection (32) from an outlet (31) in the storage space (16), characterized in that the passage channel (24) together with the socket (20) and the mouth (21) are arranged in an element (10), which as a lid can be connected sealingly with the spring container (14), - that a perforated plate (26) is arranged on the element. (10) facing surface (11) facing the storage container (14), a gap (27) being formed between said surface (11) and the perforated plate (26), that the outlet (31) of the storage space is arranged in the element (10) in this surface portion located within the space (27), and that the passage is provided with a shut-off valve (25) which, by its actuating element (38) being differentially loaded by the pressure in the passage carousel (24) and the pressure in the space (27) closes automatically when the pressure in the gap (27) falls below the pressure in the passage channel (24) in connection with the separating membrane (15) coming into contact with the perforated plate (26). 4.48 san \ .Yl Apparatus according to claim 1, characterized! in that the valve body of the shut-off valve (25) is rigidly connected to the operating element (38), which on its one side is hydraulically connected to the passage channel (24) and on its opposite side is hydraulically connected to the gap (27). _ Apparatus according to claim 2, characterized in that the operating element consists of a diaphragm. 1 :. Apparatus according to claim 2, characterized in that the operating element is formed by a guided piston (38) sealing around the periphery, the guide of which is formed The element (10), the active surface (inside 111) enclosed towards the valve seat being smaller than the piston (38) ) facing the space (27) and the closing direction of the shut-off valve v (25) goes towards the space (27). Apparatus according to any one of the preceding claims, characterized in that the element (10) further comprises a venturi nozzle (21) at the place where the connection (32) from the storage space (16) opens into the passage channel (21z), a guide channel from the socket (20) in the passage channel (211) to the constriction space (17), an aeration channel (113) and an aeration valve (35), which are connected to the constriction space (17), and a channel provided with a non-return valve (33) and a metering valve (311) (32) as a connection between the outlet (31) from the storage space (16) and the mouth (21) in the passage channel (211).