Device for signaling a critical liquid level

 

(57) Abstract:

Use: agricultural machinery, namely the means of level detection of liquid in the sprayer, the coolant in the expansion tank, etc. the invention: signal generator bipolar pulses arrive at the key element and the block allocation of the low-frequency signal, which also serves a potential sensor for installation in tanks with controlled liquid level. When the potential of the non-zero fires a key element and turns on the light and sound alarm, indicating the presence of an unacceptable level of the controlled fluid. 2 C. p. F. - ly, 2 Il.

The invention relates to agricultural machinery, namely by means of level detection fluid sprayers machines for fertilizer, the liquid level of the irrigation machines, as well as other kind of means of control of the liquid level.

A device for signaling a critical level of the liquid containing the pulse generator, the sensor for installation in tanks with controlled liquid level, a key element and indicator light. In this case, when the liquid reaches the deleted indicator light.

The disadvantage of this device is the presence of hysteresis in the characteristic of the device, the need for constant monitoring of the level of the current operation of the key element and the presence of electrolysis processes in the bulk liquid.

Also known device for signaling a critical level of the liquid containing the contact sensor, the signal generator and signal unit, which compares the levels of the signals output from the generator, and one signal is sent directly in a controlled environment, and the other is served on the environment through the partition, the height of which determines the specified controlled level.

The disadvantage of this device is its complexity and the impossibility of operational restructuring of a given level of control.

The closest to the invention is a device for signaling a critical liquid level, mainly for various kinds of agricultural machines, comprising a generator of bipolar pulses, the contact sensor for installation in tanks with controlled liquid level, a signal amplifier, a key element and a visual indicator. When working with this device the signal from the generator is fed to utilisedictated the liquid level key element is triggered and turns on light indication.

The disadvantage of this device is that for adjustment of the level of the sensor it is necessary to readjust the place of its installation, in addition, for liquids with poor conductivity sensor has a narrow range of application.

The purpose of this invention is the enhanced operational capabilities of the device, improving reliability and preventing electrolysis and destructive processes in the liquid.

This objective is achieved in that the device has a buffer amplifier T-shaped RC filter, driver of the normalized signal, the block selection control signal driver signal audible alarm, in this case, the generator output bipolar pulses through the signal amplifier is connected with the T-shaped RC filter and the input of the key element, the output of which is communicated with the input of the shaper signal audible alarm, the output of the T-shaped RC filter connected with the output of the contact sensor for installation in tanks with controlled liquid level and through the shaper of the normalized signal to the input of block allocation control signal, the output of which is communicated to the input of the buffer amplifier, as nitem, what buffer amplifier is designed as amplifier for composite transistor, and the driver signal audible alarm made in the form of an amplifier element input and inverting output of which is connected through series-connected piezoelectric emitter and diode, in this case, diode is connected in parallel to the collector-emitter junction of transistor, the base of which is connected to the control input of a key element, and between the base and emitter included the bias resistor.

Analysis of patent and scientific and technical information showed that the proposed set of features is unknown, i.e. the proposed solution meets the criterion of "novelty."

Because this design is made on the basis of known elements, the proposed solution meets the criterion of "industrial applicability".

Because the device allows for a higher level to control the level of liquids with poor electrical conductivity without any harmful effects on the liquid or on the material of the sensor, the proposed solution meets the criterion of "inventive step".

In Fig. 1 Prescr bipolar pulses 1, the signal amplifier 2, the T-shaped RC filter 3, the contact sensor 4 for installation in tanks with controlled liquid level, a shaper 5 normalized signal, unit 6 selection control signal, a buffer amplifier 7, a visual indicator 8, the supply line 9, the connector 10, the imaging unit 11, an audio alarm, a key element of 12.

In this case, the generator 1 is made well-known scheme for logic elements 561 series, they performed and the amplifier 2. The sensor 4 is made in the form of an electrode, placed in an insulated casing, and the end of the electrode protrudes from the housing. Shaper 5 normalized signal performed by the circuit of the current generator and the block 6 - selector. The buffer amplifier 7 is made in the form of a composite transistor, the key 12 can be made in the form of a transistor with base management, and the imaging unit 11 in the form of a logic element 13 is covered by the circuit of the piezoelectric transducer 14 and diode 15, the switching transistors 16. In this case, between the core element 12 and the imaging unit 11 may be an additional amplifying element 17.

The device operates as follows.

Bipolar signal from the generator 1 through the amplifier is bone actuating signal at the block 6 is missing, because the signal level is insufficient to fully open the driver 5 and therefore block 6 in accordance with the amplifier 7 is closed and the visual indicator 8 is not included. Similarly, not included key element 12, the pulses from the amplifier 2 are not on the imaging unit 11, which does not work. Otherwise, in the absence of the contact sensor 4 with fluid signal after filter 3 without hindrance, due to the greater amplitude, is fed through the imaging unit 5 and unit 6 selects the control signal sufficient to trigger the buffer amplifier 7, i.e., activate a visual indicator 8. At the same time, actuates a key element 12 and begins to pass pulses from the amplifier 2 through the element 17 on the imaging unit 11. Key transistor 16 is also opened, and the sensor (emitter) 14 through it is connected to the sound signal, i.e., includes the imaging unit 11 and the radiation of the sound signal warning about invalid (critical) level of the controlled fluid.

The use of this device allows you to effectively monitor critical fluid level, especially with poor electrical conductivity, and also completely eliminates any corrosion is progressive environments used in agricultural production, and effectively kontrolirovat a given liquid level, for example in the tractor vehicle, to control the level of, for example, engine coolant, agricultural workers neg. bodies etc. (56) Patent of great Britain N 2117910, CL G 01 F 23/24, 1983.

1. DEVICE FOR SIGNALING a CRITICAL LIQUID LEVEL, comprising a generator of bipolar pulses, the contact sensor for installation in tanks with controlled liquid level, a signal amplifier, a key element and a visual indicator, characterized in that it is provided with a buffer amplifier, T-shaped RC filter, driver of the normalized signal, the block selection control signal, the driver of the audible alarm signal, and the generator output of the bipolar pulses through the signal amplifier is connected with the T-shaped RC filter and the input of the key element, the output of which is communicated with the input of the shaper signal audible alarm, the output of the T-shaped RC filter connected with the output of the contact sensor for installation in tanks with controlled liquid level and through the shaper of the normalized signal from the input unit vydelenijami visual display and the control input is a key element.

2. The device according to p. 1, wherein the buffer amplifier is made in the form of a composite amplifier transistor.

3. The device according to p. 1, wherein the driver signal audible alarm made in the form of an amplifier element input and inverting output of which is connected through series-connected piezoelectric emitter and diode, in this case, diode is connected in parallel to the collector-emitter junction of transistor, the base of which is connected to the control input of a key element, and between the base and emitter included the bias resistor.

 

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