CN218238980U

CN218238980U - Liquid level detection circuit

Info

Publication number: CN218238980U
Application number: CN202222268217.3U
Authority: CN
Inventors: 徐奎; 金浩天
Original assignee: Shanghai Z&h Electronic Co ltd; Shanghai Zhonghong Semiconductor Equipment Co ltd
Current assignee: Shanghai Z&h Electronic Co ltd; Shanghai Zhonghong Semiconductor Equipment Co ltd
Priority date: 2022-08-26
Filing date: 2022-08-26
Publication date: 2023-01-06
Anticipated expiration: 2032-08-26

Abstract

The utility model discloses a liquid level detection circuit, liquid level detection circuit includes: the liquid level detection device comprises a direct-current power supply, a plurality of sensing modules, switch modules and indication modules, wherein the switch modules and the indication modules are in one-to-one correspondence with the sensing modules, the sensing modules are respectively arranged at different heights in a container where liquid to be detected is located, and the sensing modules are used for detecting the liquid to be detected at the heights and generating first control signals. The switch module comprises a first end, a second end and a control end, the first end of the switch module is connected with the positive electrode of the direct-current power supply, the control end of the switch module is connected with the corresponding sensing module, and the switch module is used for controlling the on-off between the first end and the second end of the switch module according to a first control signal. The indicating module comprises a first end and a second end, the first end of the indicating module is connected with the second end of the corresponding switch module, and the second end of the indicating module is connected with the negative pole of the direct-current power supply. The utility model discloses the scheme improves the real-time and the accuracy that measured data shows.

Description

Liquid level detection circuit

Technical Field

The embodiment of the utility model provides a relate to automatic control technique, especially relate to a liquid level detection circuit.

Background

In the production process of semiconductor chips, various high-viscosity or strong-corrosivity liquids are frequently used, and the liquid level of the liquids needs to be automatically monitored so as to ensure the stable operation of a production line.

The existing liquid level detection device mostly adopts floating ball type measurement and ultrasonic measurement, wherein, the floating ball type measurement is convenient to implement and has low cost, and the ultrasonic measurement and the capacitance liquid level measurement have good anti-corrosion effect.

However, in the floating ball type measuring method, the floating ball moves slowly in the process of measuring the high-viscosity liquid, so that the floating ball is easy to break down, and the ultrasonic measurement is easy to be interfered by environmental factors, so that the measuring accuracy of the two modes is not ideal.

SUMMERY OF THE UTILITY MODEL

The utility model provides a liquid level detection circuit to improve the real-time and the accuracy that measured data shows.

The embodiment of the utility model provides a liquid level detection circuit, liquid level detection circuit includes: the device comprises a direct-current power supply, a plurality of sensing modules, switch modules and indication modules, wherein the switch modules and the indication modules correspond to the sensing modules one to one.

The sensing modules are respectively arranged at different heights in the container where the liquid to be detected is located, and are used for detecting the liquid to be detected at the height and generating a first control signal;

the switch module comprises a first end, a second end and a control end, the first end of the switch module is connected with the positive electrode of the direct-current power supply, the control end of the switch module is connected with the corresponding sensing module, and the switch module is used for controlling the connection and disconnection between the first end and the second end of the switch module according to the first control signal;

the indicating module comprises a first end and a second end, the first end of the indicating module is connected with the second end of the corresponding switch module, the second end of the indicating module is connected with the negative electrode of the direct-current power supply, and the indicating module is used for sending a first indicating signal under the condition that the first end and the second end of the switch module are connected.

Optionally, the liquid level detection circuit further includes: the device comprises a relay module and an alarm module;

the relay module comprises a first control end and a first power supply end, the first control end is connected with a second end of the switch module corresponding to the sensing module with the lowest height, and the relay module is used for generating a first power supply signal under the condition that the first end and the second end of the switch module connected with the first control end are turned off;

the alarm module is connected with the first power supply end and used for sending out a first alarm signal according to the first power supply signal.

Optionally, the relay module further comprises a second power supply terminal; the relay module is also used for generating a second power supply signal under the condition that the first end and the second end of the switch module connected with the first control end are conducted;

the liquid level detection circuit further comprises: the device comprises a control module and an execution module;

the control module is connected with the second power supply end and used for generating a control signal according to the second power supply signal, wherein the control signal is used for controlling the working state of the liquid suction machine.

Optionally, the indicating module includes a light emitting diode, and the light emitting diodes in the indicating modules corresponding to the plurality of sensing modules are different in color.

Optionally, the light emitting color temperature of the light emitting diode in the indicating module is inversely correlated with the height of the corresponding sensing module.

Optionally, the number of the indication modules is 3, and the colors of the light emitting diodes in the indication modules are green, yellow and red, respectively.

Optionally, the liquid level detection circuit further includes a filter capacitor in one-to-one correspondence with the sensing module, one end of the filter capacitor is connected to the second end of the switch module connected to the corresponding sensing module, and the other end of the filter capacitor is connected to the negative electrode of the dc power supply.

Optionally, the liquid level detection circuit further includes reverse connection prevention diodes in one-to-one correspondence with the sensing modules, and the reverse connection prevention diodes are connected between the first ends of the switch modules connected to the corresponding sensing modules and the positive electrode of the dc power supply.

Optionally, the alarm module comprises a buzzer.

Optionally, the relay module comprises a communication relay.

The liquid level detection circuit that this embodiment provided includes DC power supply, sensing module, switch module and indicating module, set up in the container that awaits measuring a plurality of sensing modules of each height can be according to whether highly detecting the control signal that awaits measuring liquid generation corresponds corresponding, with break-make between control switch module first end and the second end, indicating module connects between DC power supply's negative pole and switch module's second end, can instruct different information according to the state of the switch module that corresponds, the detection to each highly awaits measuring liquid in the container has been realized, sensing module is fixed to be set up, need not change the height along with the height of liquid, the floater that has avoided leading to because of liquid glues thickness removes slowly and ultrasonic interference too big, the real-time and the accuracy of measured data display have been improved.

Drawings

Fig. 1 is a schematic structural diagram of a liquid level detection circuit provided in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a liquid level detection circuit provided in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of another liquid level detection circuit provided by the embodiment of the present invention;

fig. 4 is a schematic structural diagram of another liquid level detection circuit provided by the embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

For the problem that appears in solving the background art, the embodiment of the utility model provides a liquid level detection circuit is proposed. Fig. 1 is a schematic structural diagram of a liquid level detection circuit provided by an embodiment of the present invention, referring to fig. 1, the liquid level detection circuit 100 includes: the device comprises a direct current power supply 101, a plurality of sensing modules 102, switch modules 103 and indication modules 104, wherein the switch modules 103 correspond to the sensing modules 102 one by one. The plurality of sensing modules 102 are respectively arranged at different heights in the container where the liquid to be detected is located, and the sensing modules 102 are used for detecting the liquid to be detected at the height and generating a first control signal. The switch module 103 includes a first end a, a second end b and a control end c, the first end a of the switch module 103 is connected to the positive electrode + of the dc power supply 101, the control end of the switch module 103 is connected to the corresponding sensing module 102, and the switch module 103 is configured to control on/off between the first end a and the second end b of the switch module 103 according to a first control signal. The indication module 104 includes a first end d and a second end e, the first end d of the indication module 104 is connected to the second end b of the corresponding switch module 103, the second end e of the indication module 104 is connected to the negative pole of the dc power supply 101, and the indication module 104 is configured to send a first indication signal when the first end a and the second end of the connected switch module 103 are connected.

The sensing module 102 is a sensing device for performing level information on a container in which the liquid to be detected is located. The switch module 103 is a switch device that switches on and off of a line according to a sensing result of the sensing device. The indication module 104 is a device for indicating the corresponding information according to the on/off of the line controlled by the switch module 103.

Specifically, the sensing modules 102 may be respectively fixed on inner walls of the liquid container to be detected at different heights, so as to detect whether liquid exists at the height of the sensing module 102. The sensing module 102 is capable of detecting whether liquid is present at the level at which the sensing module 102 is located and generating a first control signal when liquid is detected and a second control signal when liquid is not detected. For example, the sensing module 102 may include a proximity sensor, and the proximity signal sensor may generate a sensing signal when an object approaches in a sensing direction, and the sensing signal may serve as the first control signal.

The control end c of the switch module 103 is connected to the corresponding sensing module 102, the first end a of the switch module 103 is connected to the positive pole + of the dc power supply 101, and the second end b of the switch module 103 is connected to the first end d of the corresponding indication module 104. The switch module 103 also comprises a third terminal a', which is connected to the negative pole of the dc power supply 103, of the switch module 103. In the case of disconnection between the first terminal a and the second terminal b of the switch module 103, the third terminal a' of the switch module 103 provides a negative power supply for the switch module 103, and forms a loop with the first terminal a of the switch module 103. The second end e of the indication module 104 is connected to the negative electrode of the dc power supply 101, and the indication module 104 can indicate different information according to the on-off state between the first end a and the second end b of the switch module 103. The switch module 103 can control the conduction between the first end a and the second end b of the switch module 103 according to the first control signal output by the corresponding sensing module 102 when the corresponding sensing module 102 detects the liquid, so that the direct current power supply 101 supplies power to the indication module 104 through the switch module 103, and the indication module 104 sends out a first indication signal to indicate that the liquid exists at the height of the corresponding sensing module 102. And under the condition that the corresponding sensing module 102 does not detect liquid, the switch module 103 controls the first end a and the second end b of the switch module 103 to be disconnected according to a second control signal output by the corresponding sensing module 102, so that the direct-current power supply 101 disconnects a line for supplying power to the indicating module 104 through the switch module 103, and the indicating module 104 sends out a second indicating signal to indicate that the corresponding sensing module 102 is located at a height without liquid. The indication modules 104 may be disposed on the outer surface of the container or in the monitoring room, and the height of each indication module 104 may be positively correlated to the height of the corresponding sensing module 102. Illustratively, the first indication signal may comprise a light-up signal of an indicator light, and the second indication signal may comprise a light-off signal of the indicator light. While the first indicator signal may comprise a high brightness signal of the indicator light, the second indicator signal may comprise a low brightness signal of the indicator light, in contrast. The plurality of sensing modules 102 are arranged at different heights of the inner wall of the container, and the cooperation of the plurality of indicating modules 104 can realize the indication of different liquid level states.

Illustratively, three contact sensors, namely a first sensor, a second sensor and a third sensor, are arranged on the inner wall of the liquid container from top to bottom, and the third sensor is arranged on the inner wall of the liquid container close to the bottom of the container. The indication module 104 is an indicator light corresponding to each sensor. During production, the liquid level of the liquid to be measured in the liquid container decreases with use. Under the condition that the liquid level of the liquid container is higher than the height of the first sensor, the three sensors can detect the existence of the liquid and generate a first control signal. The first end a and the second end b of the switch module 103 corresponding to the three sensors are kept connected, so that the three indicator lights are kept on, and the liquid level of the liquid to be measured is indicated to be higher than the height of the first sensor. Along with the output and the use of the liquid to be measured, the liquid level gradually decreases. When the liquid level of the liquid to be detected is lower than the height of the first sensor, the indicating lamp corresponding to the first sensor stops emitting light to indicate that the liquid level of the liquid to be detected is lower than the liquid level of the first sensor. When the liquid level of the liquid to be detected is lower than the height of the second sensor, the indicating lamp corresponding to the second sensor stops emitting light to indicate that the liquid level of the liquid to be detected is lower than the liquid level of the second sensor. When the liquid to be measured is used up, the indicator light corresponding to the third sensor stops emitting light so as to indicate that the liquid to be measured is used up. The indicator lamps corresponding to the first sensor, the second sensor and the third sensor can comprise light emitting diodes with different colors, the color temperature of the corresponding indicator lamps is improved along with the reduction of the setting height of the corresponding sensors, for example, the colors of the light emitting diodes of the indicator lamps corresponding to the sensors from top to bottom are green, yellow and red, so that a person on duty can visually determine the liquid level height of the liquid to be measured according to the colors of the lighted indicator lamps.

Fig. 2 is a schematic structural diagram of a liquid level detection circuit provided by an embodiment of the present invention, referring to fig. 2, on the basis of the foregoing embodiment, optionally, the liquid level detection circuit 100 further includes: a relay module 201 and an alarm module 202. The relay module 201 includes a first control terminal 203 and a first power supply terminal 204, the first control terminal 203 is connected to the second terminal b of the switch module 103 corresponding to the sensing module 102 with the lowest height, and the relay module 201 is configured to generate a first power supply signal when the first terminal a and the second terminal b of the switch module 103 connected to the first control terminal 203 are turned off. The alarm module 202 is connected to the first power supply terminal 204, and configured to send out a first alarm signal according to the first power supply signal.

The relay module 201 is a device that adjusts the internal connection relationship between the terminals according to the control signal, and can switch whether the first power supply terminal 204 outputs the power supply signal according to the control signal.

Specifically, the relay module 201 includes a first control terminal 203 and a first power supply terminal 204, the first control terminal 203 is connected to the second terminal b of the switch module 103 corresponding to the sensing module 102 with the lowest height, and the first power supply terminal 204 is connected to the alarm module 202. The relay module 201 may control whether the first power supply terminal 204 outputs a power supply signal according to the electrical signal received by the first control terminal 203, so as to control the alarm module 202 to send an alarm signal when the sensing module 102 with the lowest height does not detect the liquid to be detected. Illustratively, the relay module 201 may be a communication relay. The relay module 201 may further include a first power inlet 205 in addition to the first control terminal 203 and the first power supply terminal 204. The first control terminal 203 may include a first positive pole g and a first negative pole f, the first positive pole g of the first control terminal 203 is connected to the second end b of the switch module 103 corresponding to the sensor module 102 with the lowest height, and the first negative pole f of the first control terminal 203 may be connected to the negative pole of the dc power source 101. The first power supply terminal 204 may include a second positive electrode h and a second negative electrode i, the second positive electrode h of the first power supply terminal 204 is connected to the positive electrode of the alarm module 202, the second negative electrode i of the first power supply terminal 204 is connected to the negative electrode of the alarm module 202, and the first power supply terminal 204 provides a dc power supply for the alarm module 202. The first power input end 205 includes a third positive electrode j and a third negative electrode k, the third positive electrode j of the first power input end 205 is connected with the positive electrode + of the dc power source 101, and the third negative electrode k of the first power input end 205 is connected with the negative electrode-of the dc power source 101. The relay module 201 can control the on-off between the third positive electrode j of the first power supply access end 205 and the second positive electrode h of the first power supply end 204 and the on-off between the third negative electrode k of the first power supply access end 205 and the second negative electrode i of the first power supply end 204 according to the signal accessed by the first control end 203, so as to supply power to the alarm module 202 under the condition that the sensing module 102 with the lowest height cannot detect the liquid to be detected, and enable the alarm module 202 to send out an alarm signal. The relay module 201 may be a communications relay model G5V-2-12 VDC. The alarm module 202 may include a buzzer.

Illustratively, three contact sensors, namely a first sensor, a second sensor and a third sensor, are arranged on the inner wall of the liquid container from top to bottom, and the third sensor is arranged on the inner wall of the liquid container close to the bottom of the container. The indication module 104 is an indicator light corresponding to each sensor. During production, the liquid level of the liquid to be measured in the liquid container is reduced along with use. Under the condition that the liquid level of the liquid container is higher than the height of the first sensor, the three sensors can detect the existence of the liquid and generate a first control signal. The first end a and the second end b of the switch module 103 corresponding to the three sensors are kept connected, so that the three indicator lights are kept on, and the liquid level of the liquid to be measured is indicated to be higher than the height of the first sensor. Meanwhile, the first control terminal 203 of the relay module 201 can continuously receive the electrical signal and keep the first power supply terminal 204 from outputting the power supply signal according to the received electrical signal, so that the alarm module 202 does not work. Along with the output and the use of the liquid to be measured, the liquid level gradually decreases. When the liquid level of the liquid to be measured is lower than the height of the first sensor, the indicator light corresponding to the first sensor stops emitting light to indicate that the liquid level of the liquid to be measured is lower than the liquid level of the first sensor, and at this time, the alarm module 202 does not work. When the liquid level of the liquid to be measured is lower than the height of the second sensor, the indicator light corresponding to the second sensor stops emitting light to indicate that the liquid level of the liquid to be measured is lower than the liquid level of the second sensor, and at this time, the alarm module 202 still does not work. When the liquid to be measured is used up, the indicator light corresponding to the third sensor stops emitting light so as to indicate that the liquid to be measured is used up. Under the condition that the liquid to be detected is used up, the first control end 203 of the relay module 201 cannot receive the electric signal corresponding to the second end of the switch module 103, and the first power supply end 204 is kept outputting the power supply signal, so that the alarm module 202 provides a working power supply, and the alarm module 202 sounds to remind a worker of liquid use-up.

The liquid level detection circuit that this embodiment provided includes DC power supply, sensing module, switch module, indicating module, relay module and alarm module, set up a plurality of sensing module of each height in the container that awaits measuring and can be according to whether highly detecting the control signal that awaits measuring liquid generation corresponds corresponding at corresponding, with the break-make between control switch module first end and the second end, indicating module connects between DC power supply's negative pole and switch module's second end, can instruct different information according to the state of the switch module that corresponds, the detection and the instruction to each highly await measuring liquid in the container have been realized, sensing module is fixed to be set up, need not change the height along with the height of liquid, the floater that has avoided gluing because of liquid and leads to removes slowly and ultrasonic wave interference is too big, real-time and the accuracy that measured data shows have been improved. The relay module can control the on-off of a power supply line of the alarm module according to the state of the switch module corresponding to the sensing module with the lowest height, so that an alarm can be timely sent out when liquid is used up or is about to be used up, an operator on duty is reminded to operate, and the reliability of the detection circuit is further improved.

Fig. 3 is a schematic structural diagram of another liquid level detection circuit provided in the embodiment of the present invention, referring to fig. 3, on the basis of the foregoing embodiment, optionally, the relay module 201 further includes a second power supply terminal 301. The relay module 201 is further configured to generate a second power supply signal when the first end a and the second end b of the switch module 103 connected to the first control end 203 are conducted. The liquid level detection circuit 100 of (a) further includes a control module 302. The control module 302 is connected to the second power supply terminal 301, and is configured to generate a control signal according to the second power supply signal, where the control signal is used to control a working state of the liquid suction machine.

The control module 302 is a control device for controlling the operating state of the execution module according to the output signal of the second power supply terminal 301 of the relay module 201. The execution module is a device for sucking out liquid or canning liquid to the liquid container to be tested, and may include at least one of a liquid sucking machine and a liquid canning machine.

Specifically, the second power supply terminal 301 of the relay module 201 is connected to the control module 302, and the relay module 201 is further configured to control a power supply signal output by the second control terminal according to the electrical signal received by the first control terminal 203. Illustratively, the second power supply terminal 301 includes a fourth positive electrode l and a fourth negative electrode m, the fourth positive electrode l is connected to the positive electrode of the control module 302, the fourth negative electrode m is connected to the negative electrode of the control module 302, and the second power supply terminal 301 can provide a direct current power supply for the control module 302. The relay module 201 can control the third positive electrode j of the first power supply connection end 205 to be connected with the fourth positive electrode l of the second power supply end 301 (at this time, the third positive electrode j of the first power supply connection end 205 is disconnected with the second positive electrode h of the first power supply end 204) and control the third negative electrode k of the first power supply connection end 205 to be connected with the fourth negative electrode m of the second power supply end 301 (at this time, the third negative electrode k of the first power supply connection end 205 is disconnected with the second negative electrode i of the first power supply end 204) when the first end a and the second end b of the switch module 103 (i.e., the switch module 103 corresponding to the lowest-height sensing module 102) connected with the first control end 203 are turned on. The relay module 201 outputs a dc power signal from the second power supply terminal 301 to the control module 302. When the first terminal a and the second terminal b of the switch module 103 connected to the first control terminal 203 are disconnected, the third positive electrode j of the first power access terminal 205 is controlled to be disconnected from the fourth positive electrode l of the second power supply terminal 301 (at this time, the third positive electrode j of the first power access terminal 205 is connected to the second positive electrode h of the first power supply terminal 204), and the third negative electrode k of the first power access terminal 205 is controlled to be disconnected from the fourth negative electrode m of the second power supply terminal 301 (at this time, the third negative electrode k of the first power access terminal 205 is connected to the second negative electrode i of the first power supply terminal 204). At this time, the relay module 201 stops outputting the dc power signal from the second power supply terminal 301 to the control module 302, and outputs the dc power signal from the first power supply terminal 204 to the alarm module. The control module 302 can determine whether the liquid to be tested is used up according to the dc power signal output by the relay module 201, and generate a corresponding control signal to control the operating state of the execution module. Illustratively, the control module 302 may be an ALM control device.

Illustratively, three contact sensors, namely a first sensor, a second sensor and a third sensor, are arranged on the inner wall of the liquid container from top to bottom, and the third sensor is arranged on the inner wall of the liquid container close to the bottom of the container. The indication module 104 is an indicator light corresponding to each sensor. During production, the liquid level of the liquid to be measured in the liquid container is reduced along with use. Under the condition that the liquid level of the liquid container is higher than the height of the first sensor, the three sensors can detect the existence of liquid and generate a first control signal. The first end a and the second end b of the switch module 103 corresponding to the three sensors are kept in a connection state, so that the three indicator lamps are kept on, and the liquid level of the liquid to be measured is indicated to be higher than the height of the first sensor. Meanwhile, the first control terminal 203 of the relay module 201 can continuously receive the electrical signal, and keep the first power supply terminal 204 stopping outputting the dc power supply signal according to the received electrical signal, so that the alarm module 202 does not operate, and the relay module 201 also keeps the second power supply terminal 301 continuously outputting the power supply signal according to the electrical signal received by the first control terminal 203. The control module 302 generates a first control signal according to the power signal output by the relay module 201, and the first control signal can control the liquid sucking machine to continuously work, that is, the production of the liquid to be measured is continuously performed. Along with the output and the use of the liquid to be measured, the liquid level gradually decreases. When the liquid level of the liquid to be measured is lower than the height of the first sensor, the indicating lamp corresponding to the first sensor stops emitting light to indicate that the liquid level of the liquid to be measured is lower than the liquid level of the first sensor. At this time, the alarm module 202 does not work, and the control module 302 continuously generates the first control signal according to the power signal output by the relay module 201, so as to ensure that the liquid suction machine works continuously. When the liquid level of the liquid to be measured is lower than the height of the second sensor, the indicator light corresponding to the second sensor stops emitting light to indicate that the liquid level of the liquid to be measured is lower than the liquid level of the second sensor. At this time, the alarm module 202 still does not work, and the control module 302 continuously generates the first control signal according to the power signal output by the relay module 201, so as to ensure that the liquid suction machine continuously works. When the liquid to be measured is about to be used up, the indicator light corresponding to the third sensor stops emitting light so as to indicate that the liquid to be measured is used up. Under the condition that the liquid to be detected is used up, the first control end 203 of the relay module 201 cannot receive the electric signal corresponding to the second end of the switch module 103, and the first power supply end 204 keeps outputting a power supply signal, so that the alarm module 202 provides a working power supply, and the alarm module 202 sounds to remind a worker of liquid use-up. Meanwhile, the second power supply terminal 301 of the relay module 201 stops outputting the power signal, and the control module 302 continuously generates the second control signal without receiving the power signal output by the relay module 201, so as to ensure that the liquid suction machine stops working, and optionally, the control module 302 may also control the machine of the liquid filling machine to start working according to the second control signal, so as to re-fill the liquid container to be tested.

The liquid level detection circuit that this embodiment provided includes DC power supply, sensing module, switch module, indicating module, relay module, alarm module and control module 302, set up a plurality of sensing modules of each height in the container that awaits measuring and can be according to whether highly detecting the control signal that awaits measuring liquid generation corresponds that awaits measuring, with the break-make between control switch module first end and the second end, indicating module connects between DC power supply's negative pole and switch module's second end, can instruct different information according to the state of the switch module that corresponds, the detection and the instruction to each highly awaiting measuring liquid in the container have been realized, sensing module is fixed to be set up, need not change the height along with the height of liquid, the floater that has avoided leading to because of liquid is sticky removes slowly and ultrasonic wave interference is too big, the real-time and the accuracy of measured data display have been improved. The relay module can control the on-off of a power supply circuit of the alarm module according to the state of the switch module corresponding to the sensing module with the lowest height, so that an alarm can be timely sent out under the condition that liquid is used up or is about to be used up, and a person on duty is reminded of operating the alarm module. The control module 302 can control the working state of the liquid sucking machine and/or the liquid canning machine according to the liquid level, realize the feedback control of the production field and the liquid level of the liquid to be detected, and further improve the reliability of the detection circuit

Fig. 4 is a schematic structural diagram of another liquid level detection circuit provided by the embodiment of the present invention, referring to fig. 4, on the basis of the foregoing embodiment, optionally, the liquid level detection circuit 100 further includes a filter capacitor C1 corresponding to the sensing module 102 one-to-one, and an anti-reverse diode D1 corresponding to the sensing module 102 one-to-one, one end of the filter capacitor C1 is connected to the second end b of the switch module 103 connected to the corresponding sensing module 102, and the other end of the filter capacitor C1 is connected to the negative electrode of the dc power supply 101. The reverse connection preventing diode D1 is connected between the first end a of the switch module 103 connected to the corresponding sensing module 102 and the positive electrode + of the dc power supply 101.

Specifically, the filter capacitor C1 may be an electrolytic capacitor, and the capacitor has a relatively large capacity, and can filter an electrical signal input by the dc power supply 101, filter an alternating current component in the circuit, and improve the stability of the circuit, so that the detection reliability of the liquid level detection circuit 100 is relatively high. The reverse connection prevention diode D1 is arranged between the first end a of the switch module 103 and the positive pole + of the dc power supply 101, and can play a role in reverse connection prevention, thereby preventing elements in the detection circuit from being damaged due to reverse connection of the positive pole and the negative pole of the power supply, and further improving the reliability of the circuit.

With continued reference to fig. 4, based on the foregoing embodiment, the switch module and the corresponding sensing module may be integrated into a proximity switch sensor, and the proximity switch sensor can control the connection and disconnection between the first control end 203 and the second control end according to the sensed liquid. The indication modules 104 include light emitting diodes, and the light emitting diodes in the indication modules 104 corresponding to the plurality of sensing modules 102 have different colors. The color temperature of the light emitted by the leds in the indication module 104 is inversely related to the height of the corresponding sensing module 102.

Specifically, the proximity switch sensor may be a proximity sensor of a model CR18-8DN, and is disposed on an inner wall of a container where the liquid to be detected is located, three pins of the proximity switch sensor may be respectively connected to an anode, a cathode, and a first end of the indication module 104 through a three-phase connector, and the three-phase connector may be a connector of a model HX 25418-3A. The proximity switch sensor can detect the proximity of various levels of liquid. Each indicator module 104 may include leds of different colors, and the color temperature of the leds in the indicator module 104 is inversely related to the height of the corresponding sensor module 102. Exemplarily, in the case that the number of the sensing modules 102 is 3, the number of the switching modules 103 and the indicating modules 104 is also 3. The colors of the leds in the 3 indicator modules 104 may be set to green, yellow, and red in sequence as the corresponding sensor height decreases.

It should be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles applied thereto. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. A liquid level detection circuit, comprising:

the device comprises a direct-current power supply, a plurality of sensing modules, switch modules and indication modules, wherein the switch modules and the indication modules are in one-to-one correspondence with the sensing modules;

2. The liquid level detection circuit of claim 1, further comprising: the relay module and the alarm module;

3. The liquid level detection circuit of claim 2, wherein the relay module further comprises a second power supply terminal; the relay module is also used for generating a second power supply signal under the condition that the first end and the second end of the switch module connected with the first control end are conducted;

the liquid level detection circuit further comprises: a control module and an execution module;

4. The liquid level detection circuit of claim 1, wherein the indication module comprises a light emitting diode, and the light emitting diodes in the indication modules corresponding to the plurality of sensing modules are different in color.

5. The liquid level detection circuit of claim 4, wherein the color temperature of the light emitted by the light emitting diodes in the indicating modules is inversely related to the height of the corresponding sensing module.

6. The liquid level detection circuit of claim 5, wherein the number of indicator modules is 3,3 and the light emitting diodes in the indicator modules are green, yellow and red, respectively.

7. The liquid level detection circuit of claim 1, further comprising a filter capacitor in one-to-one correspondence with the sensing modules, wherein one end of the filter capacitor is connected to a second end of the switch module to which the corresponding sensing module is connected, and the other end of the filter capacitor is connected to a negative electrode of the dc power supply.

8. The liquid level detection circuit according to claim 1, further comprising reverse connection prevention diodes in one-to-one correspondence with the sensing modules, the reverse connection prevention diodes being connected between the first end of the switch module to which the corresponding sensing module is connected and the positive electrode of the direct current power supply.

9. The liquid level detection circuit of claim 2, wherein the alarm module comprises a buzzer.

10. The liquid level detection circuit of claim 2, wherein the relay module comprises a communication relay.