CN213600165U - Photoelectric liquid level sensor - Google Patents
Photoelectric liquid level sensor Download PDFInfo
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- CN213600165U CN213600165U CN202023111982.1U CN202023111982U CN213600165U CN 213600165 U CN213600165 U CN 213600165U CN 202023111982 U CN202023111982 U CN 202023111982U CN 213600165 U CN213600165 U CN 213600165U
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- sensor
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- circuit board
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Abstract
The utility model discloses a photoelectric liquid level sensor, which comprises a detecting head, a shell, an upper cover, a circuit board assembly and a sensor; the probe is detachably arranged in the shell through the thread matching of the side nut; the shell is internally provided with a circuit board assembly and a sensor which are electrically connected, the sensor is electrically connected with the detecting head, and the circuit board assembly is electrically connected with the cable; the surface of the probe is plated with zinc and nickel by carbon steel; an upper cover is arranged on one side of the shell, and a bottom nut is in threaded fit with the bottom of the upper cover. The probe of the photoelectric liquid level sensor adopts carbon steel plated with zinc and nickel, and can resist acid, alkali and corrosion; the probe and the sensor can be detached and assembled, and the installation is simple and reliable; the infrared light is output and detected by adopting a pulse signal with a specific duty ratio, so that misjudgment possibly caused by external light interference is avoided, and the anti-interference characteristic of the sensor is improved.
Description
Technical Field
The utility model relates to a liquid level detection technical field specifically is a photoelectric liquid level sensor.
Background
The photoelectric liquid level sensor utilizes the total reflection principle, penetrates according to the total reflection or refraction of light, and is used as the liquid level alarm signal output basis, but traditional photoelectric liquid level sensor installation is inconvenient, and the environmental limitation that is suitable for is poor, and acid and alkali resistance is not enough, easily receives external light interference.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a theme to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a photoelectric liquid level sensor comprises a detecting head, a shell, an upper cover, a circuit board assembly and a sensor; the probe is detachably arranged in the shell through the thread matching of the side nut; the shell is internally provided with a circuit board assembly and a sensor which are electrically connected, the sensor is electrically connected with the detecting head, and the circuit board assembly is electrically connected with the cable; the surface of the probe is plated with zinc and nickel by carbon steel; an upper cover is arranged on one side of the shell, and a bottom nut is in threaded fit with the bottom of the upper cover.
As a further aspect of the present invention: the probe head consists of a transmitter and a receiver.
As a further aspect of the present invention: the upper cover is provided with an indicator light electrically connected with the circuit board assembly.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the probe of the sensor adopts carbon steel plated with zinc and nickel, and can resist acid, alkali and corrosion;
2. the probe and the sensor can be detached and assembled, and the installation is simple and reliable;
3. the infrared light is output and detected by adopting a pulse signal with a specific duty ratio, so that misjudgment possibly caused by external light interference is avoided, and the anti-interference characteristic of the sensor is improved.
Drawings
FIG. 1 is a schematic diagram of a photoelectric liquid level sensor.
Fig. 2 is a front view of fig. 1.
Fig. 3 is a side view of fig. 1.
Fig. 4 is a schematic view of the working state of the photoelectric liquid level sensor.
FIG. 5 is a schematic view of another operating state of the electro-optical level sensor.
In the figure: 1-detecting head, 2-side nut, 3-shell, 4-upper cover, 5-bottom nut, 6-cable, 7-indicator light, 8-circuit board component, 9-transmitter and 10-receiver.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Example 1
Referring to fig. 1-5, the present embodiment provides a photoelectric liquid level sensor, which includes a probe 1, a housing 3, an upper cover 4, a circuit board assembly 8 and a sensor; the probe 1 is detachably arranged in the shell 3 through the thread matching of the side nut 2; the shell 3 is internally provided with a circuit board assembly 8 and a sensor which are electrically connected, the sensor is electrically connected with the detecting head 1, and the circuit board assembly 8 is electrically connected with the cable 6; the surface of the probe 1 is plated with zinc and nickel by carbon steel; an upper cover 4 is arranged on one side of the shell 3, and a bottom nut 5 is in threaded fit with the bottom of the upper cover 4.
The probe 1 is comprised of a transmitter 9 and a receiver 10.
Furthermore, an indicator light 7 electrically connected with the circuit board assembly 8 is arranged on the upper cover 4.
The working principle of the embodiment is as follows: by using the total reflection principle, the total reflection or penetration of light is used as the output basis of liquid level alarm, because the difference between the refractive index of the front material of the sensor and the refractive index of air is large, when the light enters the air from the sensor and the incident angle is larger than the critical angle of total reflection, the light will be totally reflected and can be transmitted to the receiver 10; conversely, when the medium is converted to a liquid, almost all light will penetrate the sensor tip because the refractive index of the liquid is close to the material of the sensor tip. By using the principle, a light emitter and receiver 10 is designed in the sensor, which can detect and determine the total reflection or penetration state of the light at the front end of the sensor, and drive the alarm circuit to output for the application of the back-end system equipment.
When the detecting head 1 is in an air state, the emitter 9 emits an infrared light pulse signal with a certain duty ratio, when the infrared light pulse signal vertically passes through a glass probe in the air, the light is totally reflected, at the moment, the receiver 10 can sense the light signal, and the signal according with the duty ratio is calculated, so that the signal output of the probe in the air state is controlled. Thus, false alarm caused by external light interference can be avoided. When the probe head 1 is soaked in liquid, infrared light is refracted when passing through the probe head, the receiver 10 cannot sense an infrared light signal, and a state signal when the probe head 1 is soaked in the liquid is output.
It should be noted that, as is obvious to a person skilled in the art, the invention is not limited to details of the above-described exemplary embodiments, but can be embodied in other specific forms without departing from the spirit or essential characteristics thereof.
Claims (3)
1. A photoelectric liquid level sensor is characterized by comprising a detecting head (1), a shell (3), an upper cover (4), a circuit board assembly (8) and a sensor; the detecting head (1) is detachably arranged in the shell (3) through the thread matching of the side nut (2); the shell (3) is internally provided with a circuit board assembly (8) and a sensor which are electrically connected, the sensor is electrically connected with the detecting head (1), and the circuit board assembly (8) is electrically connected with the cable (6); the surface of the probe (1) is plated with zinc and nickel by carbon steel; an upper cover (4) is arranged on one side of the shell (3), and a bottom nut (5) is in threaded fit with the bottom of the upper cover (4).
2. Optoelectronic liquid level sensor according to claim 1, characterized in that the probe head (1) consists of a transmitter (9) and a receiver (10).
3. The optoelectronic liquid level sensor according to claim 1, wherein the upper cover (4) is provided with an indicator light (7) electrically connected to the circuit board assembly (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023111982.1U CN213600165U (en) | 2020-12-22 | 2020-12-22 | Photoelectric liquid level sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023111982.1U CN213600165U (en) | 2020-12-22 | 2020-12-22 | Photoelectric liquid level sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213600165U true CN213600165U (en) | 2021-07-02 |
Family
ID=76598401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023111982.1U Active CN213600165U (en) | 2020-12-22 | 2020-12-22 | Photoelectric liquid level sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213600165U (en) |
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2020
- 2020-12-22 CN CN202023111982.1U patent/CN213600165U/en active Active
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