RU142742U1 - LIQUID SENSOR - Google Patents

Abstract

1. A liquid level sensor comprising: a float 5 with an aperture, permanent magnets 6 and 7, one of which is installed close to the upper edge of the aforementioned hole from above and the other from below, and both are mounted essentially diametrically opposite to the axis of the aforementioned holes, tube 1, with a closed lower end 2, installed in the said hole of the float 5 with the possibility of vertical movement, the housing 8, placed in the tube 1, a ferromagnetic plate 9, mounted inside the housing 8 on the supports 10 with the possibility of tilt relative Tel'nykh longitudinal axis at predetermined angles in mutually opposite directions, the elastic member 11 is configured to press the plate 9 to the supports 10, switch 13 is mounted to the activation / deactivation rejecting plate 9.2. The sensor according to claim 1, wherein said lower end 2 is sealed. The sensor of claim 1, wherein both ends of said tube are hermetically sealed. The sensor according to claim 1, in which said switch 13 is an electrical contact configured to close upon contact with said plate 9.5. The sensor according to claim 1, in which the extreme positions that the plate 9 can deviate are determined by the limiters 12.6. The sensor according to claim 1, in which the ferromagnetic plate 9, has the ability to tilt relative to the longitudinal axis at equal angles in mutually opposite directions.

Description

The utility model relates to measuring equipment, namely, devices for measuring the level of liquid media at the gas-liquid or liquid-liquid interface.

A known ultrasonic level gauge containing a sound pulse generator connected to the first end of the waveguide, a float concentrically mounted on the waveguide with the ability to move along it, a first coupling coil and a permanent magnet polarized along the hole of the float, a processing unit, a second and third coupling coil . The first coupling coil is mounted on the surface of the hole of the float, a permanent magnet is located on the outside of the first coupling coil, the second coupling coil is wound on the inserted first closed magnetic circuit and connected to the leads of the first coupling coil, the first closed magnetic circuit is located in the float and its hole coincides with the opening of the float , the waveguide is electrically conductive and its ends are electrically connected to each other through a conductive element with the formation of a short-circuited coil, the processing unit includes the preamplifier is connected to the terminals of the third communication coil wound around the introduced second closed magnetic circuit located concentrically on one of the generators of the closed loop (RF patent for the invention No. 2104501).

A disadvantage of the known level gauge is that the generation of ultrasonic pulses requires a waveguide, a piezoelectric element, an electric oscillation generator and a sensor.

A known liquid level sensor containing a magnet and a float with a through hole, covering a vertical guide in the form of a non-magnetic pipe, sealed at one end, with a disk limiting the stroke of the float at the end of the pipe, inside of which there are discreet height switches for reed switches, characterized in that the inside of the pipe has the reed switches and magnets are fixed in opposite directions relative to each other, and the reed switches are located in the field of action of the magnets interacting with the inner wall of the float when moving (RF patent for the invention No. 2135961).

A disadvantage of the known sensor is that for the measurement requires reed switches and the accompanying electrical circuit.

The objective of this utility model is to create a reliable electromechanical liquid level sensor of a float type, having a memory of any measurement stage, regardless of the voltage of the supply circuit, which does not have reed switches or piezoelectric elements.

The technical result consists in the fact that when solving the above problem, a high reliability of operation, an extended service life, and relative simplicity for mass production of the product are achieved.

This problem is solved due to the fact that the liquid level sensor contains:

float 5 with a hole,

permanent magnets 6 and 7, one of which is installed near the upper edge of the aforementioned hole above and the other below, and both are mounted essentially diametrically opposite to the axis of the said hole,

a tube 1, with a closed lower end 2, installed in the aforementioned hole of the float 5 with the possibility of vertical movement,

the housing 8, placed in the tube 1,

a ferromagnetic plate 9 mounted inside the housing 8 on the supports 10 with the possibility of tilting relative to the longitudinal axis at predetermined angles in mutually opposite directions,

an elastic element 11 configured to press the plate 9 against the supports 10,

a switch 13 mounted with the possibility of activation / deactivation when the plate 9 is deflected.

The essential features of the above technical solutions will be better understood when compared with the prototype.

The selected prototype on the reed relays “remembers the action” with the help of an electric system that ensures that the reed relay is switched on under the influence of the magnetic field of a magnet mounted on the float. The sensor prototype works as follows. When the relay contact is closed, the electric potential is supplied to the winding of this relay, and it remains in operation, “remembers the action”, until another contact of the level control system turns off its power and, therefore, turns off the reed contacts. Thus, for the operation of such a system in one measurement cycle, you need:

- two reed relays (switching on and off);

- electric power supply, which ensures the operation of relay windings.

Although the prototype sensor can dispense with magnetically operated reed contacts, in this case, too, it is necessary to use an electric readout circuit that will provide the specified operation of the reed contacts when monitoring the liquid level. That is, in this case, for the functioning of the sensor will require a complex electrical circuit.

Unlike the prototype, the functioning of the claimed device does not require windings and power circuits, and does not require a reading circuit. Electrical power is only needed for the use of signals from a level sensor.

Both the reed contacts and the contacts of the declared sensor turn on under the influence of a magnetic field, but to put the reed contacts in the off state, it is enough to remove the effect of the magnetic field, increasing, for example, the liquid level, and the contacts of the declared sensor under similar conditions will continue to remain on. This property provides the design of the claimed sensor. When the liquid level drops (from the position in FIG. 1 to the right), the magnet 7 passes through the sensor region “a”. During this period of time, the spring 11 still touches the housing 8, and the plate 9, the point of contact with the spring is inclined from the axial line of the sensor to the magnet 7 (figure 1 on the left). Microswitch 13 generates a low liquid level signal. With a further decrease in the level, the magnet 6, mounted on the float 5, will enter the zone "b", and will act on the plate 9 with its magnetic field. Under the influence of its magnetic field, it overcomes the compression force of the spring 11 and rotates clockwise around its support 10 to the position defined by the clearance “b”. At this point, the microswitch 13 gives a signal about the moment the start of swapping. As can be seen from the above, in contrast to the prototype, the duty cycle of the claimed device does not require external energy.

The reliability of the device is determined by the simplicity of the physical principles underlying the device, the simplicity of interacting parts, their small number, the minimum of functions performed by them, the ability to stamp all parts (except the spring), instantaneous switching (thanks to the use of an intermediate stage in the form of a spring 11 and movably connected with it plate 9, providing instant switching contacts of the microswitch 13). All of the above allows us to talk about the high reliability and relative simplicity of the device.

The indicated aspects of the technical result, such as an extended service life, relative simplicity for mass production of the product are a direct result of the increased reliability of the device, the simplicity of the details and their small number.

The rest of this section describes preferred embodiments of the claimed device.

Both ends of said tube may be hermetically sealed; in particular, said lower end 2 may be sealed. Said switch 13 may be an electrical contact, capable of closing / opening upon contact with said plate 9. The extreme positions to which plate 9 can deviate can be limited, for example, by means of stops 12, as well as by gaps a and b. In a preferred embodiment, the ferromagnetic plate 9 has the ability to tilt relative to the longitudinal axis at equal angles in mutually opposite directions.

The figure 1 schematically shows the design of the sensor, according to one of the preferred forms of execution.

The sensor is arranged as follows. In the tube 1 placed in the liquid, the end 2 is sealed, and the second, the end 3, is used for mounting the level sensor and the output of electric wires 4. The float 5 moves along the tube 1 with permanent magnets 6 and 7 fixed to it at the top and bottom, located directly opposite to each other. The level sensor consists of a housing 8, in which a ferromagnetic plate 9 is movably fixed, pressed against the supports 10 by a spring 11, which can be rotated by structurally specified, mutually opposite, equal angular distances in the plane of the figure under the influence of an external magnetic field around the support points 10, with limiters 12, by the gaps a and b, of the microswitch 13 emitting / or not emitting an electric signal depending on activation.

Figure 1 shows one sensor, but several such sensors can be installed in the tube, depending on the need.

The sensor operates as follows. In the position of the parts shown in the figure, the magnetic field of magnet 6 attracts the plate 9, and it puts the spring 11 in a stable state when the edge "b" of the spring 11 touches the housing 8. The angular rotation of the plate 9 should be enough to translate the microswitch 13 from one state to another. This position of the parts may correspond to the lower liquid level when there is no light indication of the level and a signal is given to turn on the booster pump. When the liquid level rises, the magnetic field of magnet 7 attracts the plate 9, and it puts the spring 11 into a stable state, when the edge "a" of the spring 11 touches the housing 8. The microswitch 13 will switch to another stable position with the output of a signal through an electric circuit.

If there are several level sensors in the tube 1, then the processes described above will occur in each sensor.

The use of sensors of the described design will increase the reliability of event recording, the ability to automate processes without additional complex switching systems and increase the life of the product.

Claims (6)

1. A liquid level sensor comprising: float 5 with a hole, permanent magnets 6 and 7, one of which is installed near the upper edge of the aforementioned hole above and the other below, and both are mounted essentially diametrically opposite to the axis of the said hole, a tube 1, with a closed lower end 2, installed in the aforementioned hole of the float 5 with the possibility of vertical movement, the housing 8, placed in the tube 1, a ferromagnetic plate 9 mounted inside the housing 8 on the supports 10 with the possibility of tilting relative to the longitudinal axis at predetermined angles in mutually opposite directions, an elastic element 11 configured to press the plate 9 against the supports 10, a switch 13 mounted with the possibility of activation / deactivation when the plate 9 is deflected. 2. The sensor according to claim 1, wherein said lower end 2 is sealed. 3. The sensor according to claim 1, in which both ends of said tube are hermetically sealed. 4. The sensor according to claim 1, wherein said switch 13 is an electrical contact configured to close upon contact with said plate 9. 5. The sensor according to claim 1, in which the extreme positions that the plate 9 can deviate are determined by the limiters 12. 6. The sensor according to claim 1, in which the ferromagnetic plate 9, has the ability to tilt relative to the longitudinal axis at equal angles in mutually opposite directions.