CN212647012U

CN212647012U - Sensitivity-adjustable immersion sensor

Info

Publication number: CN212647012U
Application number: CN202021996889.0U
Authority: CN
Inventors: 何欣原; 黎祥松
Original assignee: Guangdong Haiwu Technology Co Ltd
Current assignee: Guangdong Haiwu Technology Co Ltd
Priority date: 2020-09-11
Filing date: 2020-09-11
Publication date: 2021-03-02
Anticipated expiration: 2030-09-11

Abstract

The utility model relates to a but sensitivity regulation's immersion sensor, including water logging rope RX, adjustable resistance RT, amplifier circuit and electric control switch, water logging rope RX and adjustable resistance RT are established ties and are formed the branch road cross-over between outside power and ground, and amplifier circuit's input is connected the contact between water logging rope RX and the adjustable resistance RT, and amplifier circuit's output is connected to electric control switch's control end, and electric control switch's input is through the outside power of relay KM 1's coil connection, and outside ground is connected to electric control switch's output. The utility model discloses a sensitivity of whole sensor is adjusted through the resistance of adjusting adjustable resistance RT to the sensor that soaks, has sensitivity adjustable, simple structure's characteristics, simultaneously owing to need not main control chip programming and use, consequently also has low cost's advantage.

Description

Sensitivity-adjustable immersion sensor

Technical Field

The utility model relates to a sensing detects technical field, concretely relates to immersion sensor of adjustable sensitivity.

Background

The existing immersion sensor mostly adopts electrode type immersion detection, two electrode plates are used as electrodes, the two electrode plates are conducted during immersion to form switching value change, the immersion sensor has the advantages of low cost, no need of a logic structure and components, and only fixed-point positioning detection of immersion can be realized.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a need not main control chip, low cost, simple structure and can detect the immersion sensor that the water level adjusted sensitivity as required.

Therefore, the sensitivity-adjustable immersion sensor comprises an immersion rope RX, an adjustable resistor RT, an amplifying circuit and an electric control switch, a branch formed by connecting the immersion rope RX and the adjustable resistor RT in series is connected between an external power supply and the ground, the input end of the amplifying circuit is connected with a contact between the immersion rope RX and the adjustable resistor RT, the output end of the amplifying circuit is connected to the control end of the electric control switch, the input end of the electric control switch is connected with the external power supply through a coil of a relay KM1, and the output end of the electric control switch is connected with the external ground.

Further, the amplifying circuit comprises a transistor Q1, a base of the transistor Q1 is used as an input terminal of the amplifying circuit, the transistor Q1 is an NPN-type transistor, a collector of the transistor Q1 is connected to an external power supply through a resistor, and an output terminal of the amplifying circuit is an emitter or a collector of the transistor Q1;

in a state where the emitter is used as an output terminal, the emitter of the transistor Q1 is connected to an external ground through a resistor;

in a state where the collector is an output terminal, the emitter of the transistor Q1 is connected to the external ground.

Further, the amplifying circuit comprises a triode Q1, the base of the triode Q1 is used as the input end of the amplifying circuit, the triode Q1 is a PNP type triode, the emitter of the triode Q1 is connected to the external power supply through a resistor, and the output end of the amplifying circuit is the emitter or collector of the triode Q1;

in a state where the emitter is an output terminal, the collector of the transistor Q1 is connected to the external ground;

in a state where the collector is an output terminal, the collector of the transistor Q1 is connected to an external ground via a resistor.

Further, the electric control switch is a transistor Q2.

Further, the triode Q2 is an NPN type triode, the base of the triode Q2 is used as the control section of the electronic control switch, the collector of the triode Q2 is used as the input end of the electronic control switch, and the emitter of the triode Q2 is used as the output end of the electronic control switch.

Further, the triode Q2 is a PNP type triode, the base of the triode Q2 is used as the control section of the electronic control switch, the emitter of the triode Q2 is used as the input end of the electronic control switch, and the collector of the triode Q2 is used as the output end of the electronic control switch.

Furthermore, the water immersion type power amplifier further comprises a filter circuit, and the input end of the amplifying circuit is connected between the water immersion rope RX and the adjustable resistor RT through the filter circuit.

Further, the filter circuit comprises a capacitor C3, and two ends of the capacitor C3 are respectively connected with the input end of the amplifying circuit and the external ground.

Has the advantages that:

the utility model discloses a sensitivity of whole sensor is adjusted through the resistance of adjusting adjustable resistance RT to the sensor that soaks, has sensitivity adjustable, simple structure's characteristics, simultaneously owing to need not main control chip programming and use, consequently also has low cost's advantage.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a schematic diagram of a circuit structure of the sensor for detecting water immersion.

Fig. 2 is another schematic circuit structure diagram of the immersion sensor of the present invention.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.

Example 1:

referring to fig. 1, the detection circuit of this embodiment includes a water immersion rope RX and an adjustable resistor RT sequentially connected in series between a power supply and ground, and further includes a relay KM1, a capacitor C3, and an NPN type triode Q1 and a triode Q2 made of silicon tube material, wherein a base of the triode Q1 is connected between the water immersion rope RX and the adjustable resistor RT, so as to obtain a divided voltage of the water immersion rope RX and the adjustable resistor RT as a detection signal input, two ends of the capacitor C3 are respectively connected to a base of the triode Q1 and ground, so as to filter noise from the detection signal, so that the input detection signal is stable and clear, an emitter of the triode Q1 is grounded, a collector of the triode Q1 is connected to the power supply through a resistor R3, because the resistances of the water immersion rope RX and the adjustable resistor RT are large, an amplified current of the triode Q1 still cannot meet the on-off requirement of the relay KM1, so that a collector of the triode Q1 is connected, therefore, an amplified detection signal is input into the triode Q2, the collector of the triode Q2 is connected to a power supply through the coil of the relay KM1, and the emitter of the triode Q2 is grounded, so that the amplified current meets the on-off requirement of the relay KM 1.

The water immersion rope RX is in an infinite resistance open circuit state under normal conditions, the base voltage of a triode Q1 is 0, the triode Q1 is cut off, the base of a triode Q2 is provided with voltage by a power supply to conduct the triode Q2, the coil of a relay KM1 has current flowing through a moving contact point generating a magnetic field to attract a moving contact point to contact a normally open point, so that the normally closed point of a relay KM1 is disconnected and the normally open point is closed, the water immersion rope RX presents 50-600K omega and a resistance performance negatively related to the water immersion degree according to the difference of the water immersion degree under the water immersion state, therefore, a forward voltage and a current are generated between the base and an emitter of a triode Q1 due to the partial pressure of the water immersion rope RX and an adjustable resistor RT, when the forward voltage and the current are greater than the conduction voltage of a triode Q1, the triode Q1 is conducted, and high-low level conversion is formed on the base of a triode Q2 after the triode Q1 is, the power supply voltage connected with the base electrode of the triode Q2 is conducted to the ground through the triode Q1, so that the triode Q2 is cut off, the coil of the relay KM1 does not have current any more, the switching value of the relay KM1 is changed, the moving contact is in contact with the normally closed point, the normally closed point is closed, and the normally open point is disconnected.

Because the base voltage of the triode Q1 is determined by the voltage division of the water immersion rope RX and the adjustable resistor RT, the resistance value of the water immersion rope RX can be determined by adjusting the resistance value of the adjustable resistor RT, so that the voltage division value between the water immersion rope RX and the adjustable resistor RT along with the resistance value change of the water immersion rope RX is adjusted, the resistance value of the water immersion rope RX when the triode Q1 is conducted is determined, the conduction of the triode Q1 is achieved when different water immersion degrees are controlled, and the sensitivity control of the water immersion degrees is achieved.

Example 2:

referring to fig. 2, in the embodiment 2, on the basis of the embodiment 1, the following steps are changed: the power supply is connected to the ground through an adjustable resistor RT and a water immersion rope RX in sequence, PNP type triodes are adopted by triodes Q1 and Q2, an emitting electrode of a triode Q1 is connected with the power supply, a collecting electrode of a triode Q1 is grounded, a collecting electrode of a triode Q2 is connected with the external ground, an emitting electrode of a triode Q2 is connected with the external power supply through a coil of a relay KM1, a base electrode of a triode Q2 is connected with the collecting electrode of the triode Q1, a collecting electrode of a triode Q1 is connected to the ground through a resistor, and the rest of the triodes are connected.

When the water immersion rope RX is not immersed in water, the base electrode of the triode Q1 is at a high level, the triode Q1 is cut off, and the collector electrode of the triode Q1 is at a low level, so that the triode Q2 is switched on, the movable contact of the relay is contacted with a normally-open point, the resistance value of the water immersion rope RX is gradually reduced along with the rising of the immersion degree of the water immersion rope RX until the triode Q1 is switched on, and the collector electrode of the triode Q1 is switched to a high level to cut off the triode Q2, so that the movable contact of the relay is contacted with a normally-closed point.

It is worth mentioning that:

when the triodes Q1 and Q2 both adopt NPN type triodes, the triodes Q1 and Q2 are connected according to the mode of the embodiment 1; when the triodes Q1 and Q2 both use PNP triodes, the triodes Q1 and Q2 are connected in the manner of embodiment 2; when the triode Q1 is an NPN triode and the triode Q2 is a PNP triode, the triode Q1 is connected in the manner of embodiment 1, and the triode Q2 is connected in the manner of embodiment 2; when the transistor Q1 is a PNP transistor and the transistor Q2 is an NPN transistor, the transistor Q1 is connected in the manner of embodiment 2, and the transistor Q2 is connected in the manner of embodiment 1.

In the above solution, one end of the transistor Q1 connected to ground or one end connected to a power supply may be connected to the base of the transistor Q2 to serve as the output end of the amplifying circuit, when the end of the transistor Q1 connected to the power supply serves as the output end, the output end needs to be connected to the power supply via a pull-up resistor, when the end of the transistor Q1 connected to ground serves as the output end, the output end of the transistor Q1 needs to be connected to ground via a pull-down resistor, and the other end of the transistor Q1 needs to be connected to the power supply via a resistor.

It should be noted that no matter the position of water logging rope RX and adjustable resistance RT is changed, still triode Q1, Q2's lectotype, or triode Q1 is which end as amplifier circuit's output, all can only influence relay KM 1's movable contact initial with normally closed contact or with normally open contact, do not influence the utility model discloses a scheme is realized.

It should be finally noted that the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced with other equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. An immersion sensor with adjustable sensitivity, characterized in that: the water immersion type intelligent control circuit comprises a water immersion rope RX, an adjustable resistor RT, an amplifying circuit and an electric control switch, wherein a branch formed by serially connecting the water immersion rope RX and the adjustable resistor RT is bridged between an external power supply and the ground, the input end of the amplifying circuit is connected with a contact between the water immersion rope RX and the adjustable resistor RT, the output end of the amplifying circuit is connected to the control end of the electric control switch, the input end of the electric control switch is connected with the external power supply through a coil of a relay KM1, and the output end of the electric control switch is connected with the external ground.

2. An adjustable sensitivity immersion sensor as claimed in claim 1 wherein: the amplifying circuit comprises a triode Q1, the base electrode of the triode Q1 is used as the input end of the amplifying circuit, the triode Q1 is an NPN type triode, the collector electrode of the triode Q1 is connected to an external power supply through a resistor, and the output end of the amplifying circuit is the emitter electrode or the collector electrode of the triode Q1;

3. An adjustable sensitivity immersion sensor as claimed in claim 1 wherein: the amplifying circuit comprises a triode Q1, the base electrode of the triode Q1 is used as the input end of the amplifying circuit, the triode Q1 is a PNP type triode, the emitting electrode of the triode Q1 is connected to an external power supply through a resistor, and the output end of the amplifying circuit is the emitting electrode or the collecting electrode of the triode Q1;

4. An adjustable sensitivity immersion sensor as claimed in claim 1 wherein: the electric control switch is a triode Q2.

5. An adjustable sensitivity immersion sensor as claimed in claim 4 wherein: the triode Q2 is an NPN type triode, the base electrode of the triode Q2 is used as the control section of the electric control switch, the collector electrode of the triode Q2 is used as the input end of the electric control switch, and the emitter electrode of the triode Q2 is used as the output end of the electric control switch.

6. An adjustable sensitivity immersion sensor as claimed in claim 4 wherein: the triode Q2 is a PNP type triode, the base electrode of the triode Q2 is used as the control section of the electric control switch, the emitting electrode of the triode Q2 is used as the input end of the electric control switch, and the collecting electrode of the triode Q2 is used as the output end of the electric control switch.

7. An adjustable sensitivity immersion sensor as claimed in claim 1 wherein: the input end of the amplifying circuit is connected between the water immersion rope RX and the adjustable resistor RT through the filter circuit.

8. An adjustable sensitivity immersion sensor as claimed in claim 7 wherein: the filter circuit comprises a capacitor C3, and two ends of the capacitor C3 are respectively connected with the input end of the amplifying circuit and the external ground.

9. An adjustable sensitivity immersion sensor as claimed in claim 1 wherein:

specifically, an external power supply is sequentially connected with a water immersion rope RX and an adjustable resistor RT in series and then is connected to the ground; or

Specifically, an external power supply is connected with an adjustable resistor RT and a water immersion rope RX in series in sequence and then is connected to the ground.