CN218866118U - Water flow detection circuit and device of self-cleaning sensor - Google Patents
Water flow detection circuit and device of self-cleaning sensor Download PDFInfo
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- CN218866118U CN218866118U CN202222889919.3U CN202222889919U CN218866118U CN 218866118 U CN218866118 U CN 218866118U CN 202222889919 U CN202222889919 U CN 202222889919U CN 218866118 U CN218866118 U CN 218866118U
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Abstract
The utility model discloses a rivers detection circuitry and device of automatically cleaning sensor relates to rivers and detects technical field, and detection circuitry is including the alternating current power supply, automatically cleaning selection circuit, current-limiting voltage limiting circuit and the control circuit that connect gradually, and sensor circuit is connected with alternating current power supply, automatically cleaning selection circuit respectively, and when having the rivers, automatically cleaning selection circuit is according to the change of alternating current, and the direction of current among the control sensor circuit prevents to generate the incrustation scale and detect on the sensor surface. The utility model discloses when detecting rivers, realize having prevented the formation of surface incrustation scale to rivers detection sensor's automatically cleaning.
Description
Technical Field
The utility model belongs to the technical field of the rivers detect technique and specifically relates to a rivers detection circuitry and device of automatically cleaning sensor is related to.
Background
The water flow detection is a basic element of water management, when detecting water flow, because current flows in the water flow, metal ions in water quality can be electrolyzed and attached to the surface of the water flow detection sensor, and a thick calcium layer is formed on the surface of the water flow detection sensor as a long-time attachment result, so that the water flow detection sensor is damaged on one hand, and the detection result is influenced on the other hand.
Therefore, how to keep the sensor surface clean is a problem to be solved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a rivers detection circuitry and device of automatically cleaning sensor, according to the interchange characteristic of alternating current, the rivers direction on sensor surface is flowed in the control flow, flows along the positive direction when positive half cycle, and metal ion is attached to sensor surface, flows along the opposite direction when the negative half cycle, makes the metal ion attached to sensor surface leave, has guaranteed the cleanness on sensor surface, simple structure.
In a first aspect, the above mentioned utility model aims at realizing through following technical scheme:
a water flow detection circuit of a self-cleaning sensor comprises an alternating current power supply, a self-cleaning selection circuit, a current-limiting voltage-limiting circuit and a control circuit which are sequentially connected, wherein the sensor circuit is respectively connected with the alternating current power supply and the self-cleaning selection circuit, and when water flows, the self-cleaning selection circuit controls the current direction in the sensor circuit according to the change of alternating current, so that scale is prevented from being generated on the surface of the sensor and detection is carried out.
The utility model discloses further set up to: the ac power supply includes an ac transformer for converting 220V ac power to low voltage ac power.
The utility model discloses further set up to: the sensor circuit comprises a water flow detection unit and an electrolysis unit, wherein the electrolysis unit is connected with the first output end of the alternating current power supply, the water flow detection unit is connected with the self-cleaning selection circuit, when water flows between the electrolysis unit and the water flow detection unit, water flow detection and self cleaning are carried out, and detection is stopped when no water exists.
The utility model discloses further set up to: the self-cleaning selection circuit comprises a first voltage division circuit, a forward conducting circuit and a reverse conducting circuit, one end of the first voltage division circuit, the first end of the forward conducting circuit and one end of the reverse conducting circuit are connected with the second output end of the alternating current power supply, the first voltage division end of the first voltage division circuit, the other end of the reverse conducting circuit and the second end of the forward conducting circuit are connected together, the other end of the first voltage division circuit is connected with the water flow detection unit of the sensor circuit, and the third end of the forward conducting circuit is connected with the current-limiting voltage-limiting circuit.
The utility model discloses further set up to: the forward conducting circuit comprises a PNP triode, the base electrode of the PNP triode is connected with a first voltage division end, the emitting electrode of the PNP triode is connected with a second output end of an alternating current power supply, the collecting electrode of the PNP triode is connected with a current-limiting voltage-limiting circuit, the PNP triode is conducted when alternating current is in a positive half cycle, and current forms a forward loop along the first end of the alternating current, the PNP triode, one part of the first voltage division circuit, the sensor circuit and the second end of the alternating current.
The utility model discloses further set up to: the reverse conduction circuit comprises a diode, the anode of the diode is connected with the first voltage division end, the cathode of the diode is connected with the second output end of the alternating current power supply, when the alternating current is in the negative half cycle, the diode is conducted, and current forms a reverse loop along the second end of the alternating current, the sensor circuit, a part of the first voltage division circuit, the diode and the first end of the alternating current.
The utility model discloses further set up to: the current-limiting and voltage-limiting circuit comprises a current-limiting circuit, a rectifying circuit, a filter circuit and a voltage-limiting circuit which are connected in sequence, wherein one end of the current-limiting circuit is connected with the output end of the self-cleaning selection circuit, and the output end of the voltage-limiting circuit is connected with the control circuit.
The utility model discloses further set up to: the voltage limiting circuit comprises a second voltage division circuit and a voltage stabilizing circuit, the second voltage division circuit is connected with the filter circuit in parallel and used for dividing the output voltage of the filter circuit, one end of the voltage stabilizing circuit is connected with the second voltage division end of the second voltage division circuit, and the other end of the voltage stabilizing circuit is connected with the positive end of the direct-current power supply and used for stabilizing the voltage value of the second voltage division end.
The utility model discloses further set up to: the control circuit comprises a control chip.
In a second aspect, the above object of the present invention can be achieved by the following technical solutions:
the utility model provides a rivers detection device of automatically cleaning sensor, includes rivers detection circuitry board, is provided with this application on the rivers detection circuitry board rivers detection circuitry.
Compared with the prior art, the beneficial technical effect of this application does:
1. according to the self-cleaning sensor, the alternating current, the forward and reverse conducting circuits are adopted, the flow directions of the current in the control circuit in the positive half cycle and the negative half cycle of the alternating current are opposite, and the metal ions are controlled not to be attached to the surface of the sensor, so that the self-cleaning of the surface of the sensor is realized;
2. furthermore, the voltage division parameter in the regulating circuit can be suitable for various different environments and medium requirements.
Drawings
FIG. 1 is a schematic diagram of a detection circuit according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a detection circuit according to another embodiment of the present application;
FIG. 3 is a schematic diagram of a detection circuit according to an embodiment of the present application.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The water flow detection circuit of the self-cleaning sensor comprises an alternating current power supply, a self-cleaning selection circuit, a current-limiting voltage-limiting circuit and a control circuit which are sequentially connected, wherein the sensor circuit is respectively connected with the alternating current power supply and the self-cleaning selection circuit, when water flows, the self-cleaning selection circuit controls the current direction in the sensor circuit according to the change of alternating current, so that the current flowing through the surface of the sensor continuously changes the direction according to the alternating current characteristic, when the current is in a forward direction, metal ions in the water flow are attached to the surface of the sensor, when the current is in a reverse direction, the metal ions attached to the surface of the sensor move to the surface of an electrolysis unit due to the reverse direction of the current, and when the next current is in the forward direction, the metal ions in the water flow and the metal ions attached to the surface of the electrolysis unit move towards the surface of the sensor due to the reverse direction of the current, so that the repeated attachment is also removed, the metal ions in the water flow cannot be completely attached to the surface of the electrolysis unit or the sensor, and scale is prevented from being generated on the surface of the sensor.
Calcium carbonate or other combined calcium deposits are easily generated by metal calcium ions in the water flow.
As shown in fig. 2, the current-limiting and voltage-limiting circuit includes a current-limiting circuit, a rectifying circuit, a filtering circuit, and a voltage-limiting circuit connected in sequence, one end of the current-limiting circuit is connected to the output end of the self-cleaning selection circuit, and the output of the voltage-limiting circuit is connected to the control circuit.
The ac power supply includes an ac transformer for converting 220V ac power to low voltage ac power.
The sensor circuit comprises a water flow detection unit and an electrolysis unit, wherein the electrolysis unit is connected with a first output end of an alternating current power supply, the water flow detection unit is connected with a self-cleaning selection circuit, when water flows between the electrolysis unit and the water flow detection unit, water flow detection and self cleaning are carried out, and detection is stopped when no water exists.
In a specific embodiment of the present application, the water flow detection unit is a small pole piece for detecting a water flow signal, the electrolysis unit is a large pole piece, and the water flow detection unit and the electrolysis unit form a water flow detection sensor.
The utility model provides a rivers detection circuitry schematic diagram of self-cleaning sensor, as shown in fig. 3, form alternating current power supply by the transformer, convert 220V's alternating current into low-voltage alternating current, transformer primary coil connects 220V alternating current, and secondary coil outputs low-voltage alternating current.
The first end of secondary coil connects the one end of first resistance R1, the negative terminal of first diode D1, PNP triode Q1's projecting pole, the other end of first resistance R1, the positive terminal of first diode D1, PNP triode Q1's base link together, and connect the one end of second resistance R2, the little pole piece of rivers detection sensor is connected to the other end of second resistance R2, the second end of secondary coil is connected to the big pole piece of rivers detection sensor.
The collector of the PNP triode Q1 is connected with one end of a third resistor R3, the other end of the third resistor R3 is connected with the positive end of a second diode D2, the negative end of the second diode D2 is connected with one end of a filter capacitor C1 and one end of a fifth resistor R5, the other end of the fifth resistor R5 is connected with the positive end of the third diode D3, one end of a sixth resistor R6 and one end of a seventh resistor R7, and the other end of the sixth resistor R6 and the other end of the filter capacitor C1 are connected with the power ground.
The negative end of the third diode D3 is connected with the positive end of a 5V power supply, the other end of the seventh resistor R7 is connected with one input end of a control chip, and the control chip is powered by the 5V power supply.
The first resistor R1 and the second resistor R2 are connected in series and used for forming a first voltage division circuit for dividing the alternating current output, and the voltage of the voltage division end is used for providing base voltage for the PNP triode Q1.
The first end of the secondary coil of the transformer, the emitting electrode of the PNP triode Q1, the base electrode of the PNP triode Q1, the second resistor R2, the water flow sensor and the second end of the secondary coil form a forward conducting circuit to form a forward current loop, and the second end of the secondary coil of the transformer, the water flow sensor, the second resistor R2, the first diode D1 and the first end of the secondary coil form a reverse conducting circuit to form a reverse current loop, as shown by dotted lines in the figure. The second end of the secondary coil is connected with the power ground.
The third resistor R3 limits the current flowing through, the second diode D2 rectifies the positive half-cycle alternating current flowing through the emitter-collector of the PNP triode, the filter capacitor C1 filters the whole flowing alternating current to form direct current, the fifth resistor R5 and the sixth resistor R6 form a second voltage division circuit, and the filtered direct current is divided to meet the voltage requirement of the control circuit. The third resistor R3, the second diode D2, the filter capacitor C1, the fifth resistor R5, the sixth resistor R6 and the third diode D3 form a current-limiting and voltage-limiting circuit, wherein the current-limiting circuit comprises the third resistor R3, the rectifying circuit comprises the second diode D2, the filter circuit comprises the filter capacitor C1, the second voltage-dividing circuit comprises the fifth resistor R5 and the sixth resistor R6, and the voltage-limiting circuit comprises the third diode D3.
The third diode D3 is used to clamp the voltage of its positive terminal, keeping the voltage of its positive terminal between 5.3V and 5.5V.
According to the detection circuit, when water flows between a large pole piece and a small pole piece of the water flow detection sensor, the forward conducting circuit or the reverse conducting circuit works, current flows in the PNP triode, the output of the current-limiting and voltage-limiting circuit is not 0, and the control circuit performs water flow detection; when no water flows between the large pole piece and the small pole piece, the forward conducting circuit is cut off, no current flows in the PNP triode, the output of the current-limiting and voltage-limiting circuit is 0, and no water flow is detected.
The value of second resistance R2 is adjusted, can adjust the base plate voltage of PNP triode, makes the circuit work at different trigger points to satisfy different environment and medium demand.
When no current exists in the current-limiting and voltage-limiting circuit, the filter capacitor discharges through the fifth resistor and the sixth resistor, the capacitance value of the filter capacitor and the resistance value of the sixth resistor are adjusted, and the discharging time length is adjusted, so that the requirements of the control circuit on different input signals are met.
The utility model provides a rivers detection device of automatically cleaning sensor, including rivers detection circuitry board, be provided with this application on the rivers detection circuitry board rivers detection circuitry for carry out the rivers and detect.
The utility model provides a rivers detection circuitry stops to detect when anhydrous, when having the water to detect, based on the alternating current characteristic of alternating current, realizes adhering to and eliminating the metal ion on the rivers detection sensor surface, has realized the automatically cleaning to rivers detection sensor.
The above is the preferred embodiment of the utility model, not limit according to this the utility model discloses a protection scope, the event: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (10)
1. A water flow detection circuit for a self-cleaning sensor, comprising: the self-cleaning water meter comprises an alternating current power supply, a self-cleaning selection circuit, a current-limiting voltage-limiting circuit and a control circuit which are sequentially connected, wherein a sensor circuit is respectively connected with the alternating current power supply and the self-cleaning selection circuit, and when water flows, the self-cleaning selection circuit controls the current direction in the sensor circuit according to the change of alternating current, so that scale is prevented from being generated on the surface of the sensor and detection is carried out.
2. The self-cleaning sensor water flow detection circuit of claim 1, further comprising: the ac power supply includes an ac transformer for converting 220V ac power to low voltage ac power.
3. The self-cleaning sensor water flow detection circuit of claim 1, further comprising: the sensor circuit comprises a water flow detection unit and an electrolysis unit, wherein the electrolysis unit is connected with the first output end of the alternating current power supply, the water flow detection unit is connected with the self-cleaning selection circuit, when water flows between the electrolysis unit and the water flow detection unit, water flow detection and self cleaning are carried out, and detection is stopped when no water exists.
4. The self-cleaning sensor water flow detection circuit of claim 1, further comprising: the self-cleaning selection circuit comprises a first voltage division circuit, a forward conducting circuit and a reverse conducting circuit, wherein one end of the first voltage division circuit, the first end of the forward conducting circuit and one end of the reverse conducting circuit are connected with the second output end of the alternating current power supply, the first voltage division end of the first voltage division circuit, the other end of the reverse conducting circuit and the second end of the forward conducting circuit are connected together, the other end of the first voltage division circuit is connected with the water flow detection unit of the sensor circuit, and the third end of the forward conducting circuit is connected with the current and voltage limiting circuit.
5. The self-cleaning sensor water flow detection circuit of claim 4, wherein: the positive conducting circuit comprises a PNP triode, the base electrode of the PNP triode is connected with a first voltage division end, the emitting electrode of the PNP triode is connected with a second output end of the alternating current power supply, the collecting electrode of the PNP triode is connected with a current-limiting voltage-limiting circuit, when alternating current is in positive half cycle, the PNP triode is conducted, and current forms a positive loop along the first end of the alternating current, the PNP triode, one part of the first voltage division circuit, the sensor circuit and the second end of the alternating current.
6. The self-cleaning sensor water flow detection circuit of claim 4, wherein: the reverse conducting circuit comprises a diode, the anode of the diode is connected with the first voltage division end, the cathode of the diode is connected with the second output end of the alternating current power supply, when the alternating current is in the negative half cycle, the diode is conducted, and the current forms a reverse loop along the alternating current second end, the sensor circuit, a part of the first voltage division circuit, the diode and the alternating current first end.
7. The self-cleaning sensor water flow detection circuit of claim 1, further comprising: the current-limiting and voltage-limiting circuit comprises a current-limiting circuit, a rectifying circuit, a filter circuit and a voltage-limiting circuit which are connected in sequence, wherein one end of the current-limiting circuit is connected with the output end of the self-cleaning selection circuit, and the output end of the voltage-limiting circuit is connected with the control circuit.
8. The self-cleaning sensor water flow detection circuit of claim 7, further comprising: the voltage limiting circuit comprises a second voltage division circuit and a voltage stabilizing circuit, the second voltage division circuit is connected with the filter circuit in parallel and used for dividing the output voltage of the filter circuit, one end of the voltage stabilizing circuit is connected with the second voltage division end of the second voltage division circuit, and the other end of the voltage stabilizing circuit is connected with the positive end of the direct-current power supply and used for stabilizing the voltage value of the second voltage division end.
9. The self-cleaning sensor water flow detection circuit of claim 1, further comprising: the control circuit comprises a control chip.
10. A water flow detection device of a self-cleaning sensor is characterized in that: the water flow detection circuit board is provided with the water flow detection circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222889919.3U CN218866118U (en) | 2022-10-31 | 2022-10-31 | Water flow detection circuit and device of self-cleaning sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222889919.3U CN218866118U (en) | 2022-10-31 | 2022-10-31 | Water flow detection circuit and device of self-cleaning sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218866118U true CN218866118U (en) | 2023-04-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222889919.3U Active CN218866118U (en) | 2022-10-31 | 2022-10-31 | Water flow detection circuit and device of self-cleaning sensor |
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| Country | Link |
|---|---|
| CN (1) | CN218866118U (en) |
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2022
- 2022-10-31 CN CN202222889919.3U patent/CN218866118U/en active Active
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