CH622887A5 - Device for detecting the level of a liquid - Google Patents

Description

622 887

Claims (4)

1. Liquid level detector device for tank or apparatus intended to contain a liquid, characterized in that the body of the device comprises a first and a second chamber (1,2) separated from each other by a partition ( 3) having a bore (4) in which is engaged the rod (5) of a pusher whose head (6) rests on an elastic membrane (7) arranged in the first chamber parallel to the partition and whose end of the rod (5) is opposite the control of a reversing switch (8) mounted in the second chamber. 2. Device according to claim 1, designed to be mounted in a tank or device intended to contain a liquid, characterized in that the first chamber (1) has an opening, while the second chamber (2) is provided with a sealed pipe (10) allowing the switch (8) to be connected by electrical wires (11) to control devices, without the risk of liquid penetrating into the second chamber (2). 3. Device according to claim 1, designed to be mounted outside a tank or apparatus intended to contain a liquid, characterized in that the first chamber (1) is provided with a sealed pipe (13) intended to enter the tank or device, while the second chamber (2) has an opening (14) allowing the passage of electric wires (11) connecting the switch (8) to control devices. 4. Device according to one of claims 1 to 3, characterized in that the reversing switch (8) is a microcontact switch. The subject of the invention is a liquid level detector device for a tank or apparatus intended to contain a liquid. There are already known mechanical devices generally comprising a float which actuates a valve for closing the supply of liquid into a tank when the level of liquid reaches a certain height. The device according to the invention has the advantage over known mechanical devices of being able to be mounted either inside or outside the tank or apparatus intended to contain a liquid, of allowing automatic control of the level and of being able to be coupled either to alarm signals or to commands for starting pump motors, for example. The device according to the invention is characterized in that the body of this device comprises a first and a second chamber separated from each other by a partition having a bore in which is engaged the rod of a pusher whose head rests on an elastic membrane arranged in the first chamber parallel to the partition and whose end of the rod is opposite the control of a reversing switch mounted in the second chamber. The appended drawing represents, schematically and by way of example, an embodiment of the device which is the subject of the invention and a variant. fig. 1 is an elevational view, in axial section. fig. 2 is an elevation view, in axial section of the variant. The device represented in FIG. 1 is designed to be mounted inside a tank or apparatus intended to contain a liquid. It comprises a cylindrical body divided into two chambers 1 and 2 by a transverse partition 3 having an axial bore 4 in which is engaged a rod 5 of a pusher whose head 6 rests on a membrane 7 mounted in the chamber 1 under the partition. cross section 3. A microcontact inversion switch 8 is arranged in chamber 2 facing rod 5 of the pusher on a support 9 mounted on partition 3. A sealed pipe 10 is mounted in the extension of chamber 2. electrical wires 11, connecting the reversing switch 8 to a control device located outside the tank or the device in which the device is mounted, pass through this sealed pipe 10. Note that chamber 1 is open at its lower end. As long as the level of liquid in the reservoir in which the device is mounted does not reach the open lower end of chamber 1 of the device, membrane 6 is held away from partition 3 by the weight of pusher 5, 6. If the level of liquid continues to rise, the membrane 6 is pushed upwards, and the rod 5 of the pusher actuates the inversion switch 8 and the control device to which it is connected by the electric wires 11. When the level of liquid drops again, the membrane 6 resumes its position shown in FIG. 1 and the rod 5 of the pusher no longer actuates the control device via the reversing switch 8 and the electrical wires 11. In the example described above, the device is mounted in the upper part of a tank in order to signal that the level of the liquid is approaching the upper limit, and/or cause the switching on of devices intended to prevent it does not exceed this higher level. Given the tightness of the chamber 2 and the pipe 10, the device shown in FIG. 1 can also be immersed at the bottom of the tank to signal that the level of the liquid is approaching the lower level and/or cause the engagement of devices intended to fill it again. The variant represented in FIG. 2 relates to a device intended to be mounted outside a tank or apparatus intended to contain a liquid. In this case, it is the chamber 1 which is provided with a sealed pipe 13 intended to dive into the corresponding reservoir or apparatus, either at the maximum level, or at the minimum level of the liquid in this reservoir or apparatus. Under these conditions, a pressure is exerted on the membrane 6 as soon as the liquid exceeds in height the lower open end of the sealed pipe 13 and vice versa. It will be noted that, in this variant, the reversal switch with microcontact 8 placed in the chamber 2 is actuated by the rod 5 of the pusher acting on an actuating lever 12. The chamber 2 being located outside the reservoir or of the device intended to contain a liquid, the wires 11, connecting the inversion switch 8 to a device for controlling the level of the liquid, can pass through a simple hole 14 made in a side wall of the chamber 2. The device described and shown in the drawing can be used in any liquid because it can be made of anticorrosive material. It can be used to protect pumps or other equipment liable to be damaged by lack of liquid. 2 5 10 15 20 25 30 35 40 45 50 55 R 1 drawing sheet