Ultrasonic liquid level sensor for aviation

Abstract

The utility model belongs to the field of airplane water sewage treatment, and relates to an aviation ultrasonic liquid level sensor which comprises a shell, a probe base, an ultrasonic detection assembly, a circuit board assembly, an upper cover, an electric connector and the like. The two ultrasonic detection assemblies and the circuit board assembly are fixed on the probe base, the two ultrasonic detection assemblies form a certain angle after being installed, and detection of an object is achieved by transmitting ultrasonic signals and receiving reflected signals. When the ultrasonic signals touch the detected liquid, reflection echoes can be generated, and after the sensor receives the reflection signals, the position of the liquid is judged by processing the intensity and time of the reflection signals. The ultrasonic sensor is used for monitoring the liquid level, can accurately monitor whether liquid exists or not, and can monitor information in real time and transmit the information to other equipment for processing. Through monitoring of the ultrasonic sensor, liquid overflow or excessive consumption can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of aircraft water sewage treatment, relates to an ultrasonic liquid level sensor, specifically ultrasonic technology and embedded software technology, can accurately judge whether the liquid level in the container reaches the monitoring point and send signals. BACKGROUND

[0002] The ultrasonic liquid level sensor is widely applied in industrial liquid-containing systems, has non-contact measurement, high precision and wide adaptability, and can be divided into liquid level switch type and continuous measurement type according to different application requirements, wherein the liquid level switch type mainly forms a fork-shaped probe through an internal piezoelectric crystal, the middle part is separated by air, when the probe is immersed in liquid, the crystal is coupled with sound waves, leading to the state change of the ultrasonic liquid level switch.

[0003] At present, the domestic civil aviation field does not have the ultrasonic liquid level sensor similar to the utility model, which is mainly used in the field of civil aviation water sewage treatment and can also be popularized and applied to other liquid-containing systems. CONTENT OF THE UTILITY MODEL

[0004] The utility model proposes an ultrasonic liquid level sensor for aviation from a professional and unique perspective according to the demand of liquid level monitoring in the sewage tank of the water sewage treatment system of a civil aircraft.

[0005] The ultrasonic liquid level sensor is provided with a control unit, has liquid level information calculation and sensor working state monitoring functions, and sends the liquid level information, working state information and configuration state information to the collection system or the control system through the CAN bus.

[0006] TECHNICAL SCHEME

[0007] An ultrasonic liquid level sensor for aviation comprises a probe base, a shell, an upper cover, an electric connector, a circuit board assembly and an ultrasonic detection assembly.

[0008] The shell is a cylindrical barrel, the lower end is fixed with the probe base, and the upper end is fixed with the upper cover.

[0009] Two ultrasonic detection assemblies are installed on the probe base, one of which is used as a transmitting end for transmitting ultrasonic waves, and the other is used as a receiving end for receiving ultrasonic waves.

[0010] The circuit board assembly is fixed on the probe base through screws, and the circuit board assembly is connected with the two ultrasonic detection assemblies.

[0011] The electric connector is further fixed in the middle part of the upper cover, and the electric connector is used for leading out the connecting line on the circuit board assembly.

[0012] Further, the axes of the two ultrasonic detection components intersect at an angle alpha. The ultrasonic liquid level sensor comprises two ultrasonic detection components 11 installed in two holes of the probe base 1. Among the two ultrasonic detection components 11, one is a transmitting end and the other is a receiving end, which are installed at an angle behind the probe base 1. When the transducer sheet of the transmitting end emits ultrasonic waves under voltage, the principle of sound reflection and refraction is used to realize the transmission and reception of ultrasonic waves.

[0013] Further, the axes of the two ultrasonic detection components intersect at an angle alpha. The ultrasonic liquid level sensor comprises two ultrasonic detection components 11 installed in two holes of the probe base 1. Among the two ultrasonic detection components 11, one is a transmitting end and the other is a receiving end, which are installed at an angle behind the probe base 1. When the transducer sheet of the transmitting end emits ultrasonic waves under voltage, the principle of sound reflection and refraction is used to realize the transmission and reception of ultrasonic waves.

[0014] Further, the axes of the two ultrasonic detection components intersect at an angle alpha. The ultrasonic liquid level sensor comprises two ultrasonic detection components 11 installed in two holes of the probe base 1. Among the two ultrasonic detection components 11, one is a transmitting end and the other is a receiving end, which are installed at an angle behind the probe base 1. When the transducer sheet of the transmitting end emits ultrasonic waves under voltage, the principle of sound reflection and refraction is used to realize the transmission and reception of ultrasonic waves.

[0015] Further, the probe base and the shell are provided with a retaining ring and a sealing ring. The retaining ring 10 is used for fixing between the shell 3 and the probe base 1, and the sealing of the two is realized through the sealing ring 2.

[0016] Further, the probe base and the shell are provided with a retaining ring and a sealing ring. The retaining ring 10 is used for fixing between the shell 3 and the probe base 1, and the sealing of the two is realized through the sealing ring 2.

[0017] The ultrasonic liquid level sensor adopts a sealing ring as a main sealing element, and the sealing structures at the sealing rings 2 and 4 are radial sealing, and the sealing at the sealing ring 8 is axial sealing.

[0018] Further, the ultrasonic liquid level sensor is connected with the tank through a V-shaped flange on the shell, and is connected with a cable through a D38999 Ш series socket 6.

[0019] The circuit board assembly 2 is fixed on the base through two screws 12, and comprises three functional modules such as a power supply module, a signal processing module and a CAN communication module. The power supply module converts an external 28V DC power supply into +5V voltage required by each functional module of the product for work, and the LC filter circuit is used for suppression and smoothing when a power supply surge or peak occurs; and the energy storage circuit provides a power supply for continuous work of the product when the power supply is in a short-time undervoltage state.

[0020] Technical effects

[0021] 1. The ultrasonic transducer sheet is used as an ultrasonic generator, the transducer sheet is packaged in the detection component and fixed in the probe base, and non-contact measurement of the liquid level can be realized.

[0022] 2, The utility model discloses utilize the principle of reflection and refraction of ultrasonic wave, and the two ultrasonic wave detection components are fixed at a certain angle each other innovatively, when the ultrasonic wave signal meets the liquid to be detected, the reflection echo is produced, and the position of the liquid is judged through processing the intensity and time of reflection signal.

[0023] 3, The utility model discloses a circuit board subassembly includes power module, signal processing module and CAN communication module three function modules, wherein power module transforms external 28V DC power supply into +5V voltage that each function module of product needs, when the power supply appears surge or peak, LC filter circuit plays the inhibition and smoothness, when the power supply is in short time under voltage condition, the energy storage circuit provides the power supply for the continuous work of product.

[0024] 4, The utility model discloses signal processing module adopts AVR singlechip as core processor, gathers the result of signal change module to determine current liquid level alarm information and self -checking information, and controls CAN communication module to send liquid level alarm information and self -checking information.

[0025] 5, The utility model discloses the type of transmission signal of ultrasonic wave liquid level sensor is digital signal, and the liquid level information, working state information, configuration state information are output through CAN bus, and the power -on self -test including CPU detection, configuration state detection, function detection can be carried out simultaneously.

[0026] 6, The utility model discloses the ultrasonic wave liquid level sensor is mainly used in the sewage liquid level monitoring of aircraft sewage treatment system currently, and can be further used in the liquid level monitoring of liquid -containing system of food, medicine, chemical industry and other industrial departments.

[0027] 5, The utility model discloses the ultrasonic wave liquid level sensor simple structure, stable work, environmental adaptability is strong, possesses state detection function, can be used for intelligent monitoring system, and the economic benefit is good. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is the structure diagram of the utility model.

[0029] In the drawing: 1 - probe base, 2 - sealing ring I, 3 - shell, 4 - sealing ring II, 5 - upper cover, 6 - electric connector, 7 - baffle ring I, 8 - sealing ring III, 9 - circuit board subassembly, 10 - baffle ring II, 11 - ultrasonic wave detection component, 12 - circuit board fixing screw. DETAILED DESCRIPTION

[0030] The utility model will be described further below in conjunction with the embodiment. The following described only a part of the embodiment of the utility model, not all embodiments. Based on the embodiment of the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the scope of the utility model protection.

[0031] This part is an embodiment of the present application, used to explain and illustrate the technical scheme of the present application.

[0032] An ultrasonic liquid level sensor for aviation, comprising a probe base 1, a shell 3, an upper cover 5, an electrical connector 6, a circuit board assembly 9, an ultrasonic detection assembly 11, a circuit board fixing screw 12, hole retainer rings 7 and 10, and a sealing ring. The retainer ring 7 is used for fixing between the shell 3 and the upper cover 5, and the sealing ring II 4 and the sealing ring III 8 are used to realize the sealing of each other. The retainer ring 10 is used for fixing between the shell 3 and the probe base 1, and the sealing ring I 2 is used to realize the sealing of the two.

[0033] Application examples of the present embodiment:

[0034] Application scenario one: used for monitoring the liquid level in the sewage tank of the aircraft sewage treatment system, installed on a specific position of the tank body, when the liquid level in the sewage tank reaches a specific position, the sensor activates and continuously feeds back information.

[0035] Application scenario two: used for monitoring the liquid level of the clean water tank and filter tank in drinking water treatment, to ensure the continuity and efficiency of the water treatment process.

[0036] Application scenario three: used for monitoring the liquid level in the storage tank or reaction tank, to ensure environmental protection and safe operation.

[0037] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with that in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless otherwise defined. The above specific embodiments further illustrate the purpose, technical scheme and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An ultrasonic liquid level sensor for use in aviation, characterized by: The sensor comprises a probe base, a shell, an upper cover, an electric connector, a circuit board assembly and an ultrasonic detection assembly; The shell is a cylindrical barrel, the lower end of which is fixed with the probe base, and the upper end of which is fixed with the upper cover; Two ultrasonic detection assemblies are installed on the probe base, one of which is used as a transmitting end for transmitting ultrasonic waves, and the other of which is used as a receiving end for receiving ultrasonic waves; The circuit board assembly is fixed on the probe base by screws, and the circuit board assembly is connected with the two ultrasonic detection assemblies; The electric connector is further fixed in the middle of the upper cover, and the electric connector is used for leading out the connecting lines on the circuit board assembly.

2. The ultrasonic liquid level sensor for aerospace applications as claimed in claim 1, wherein: The axes of the two ultrasonic detection assemblies intersect at an angle α.

3. The ultrasonic liquid level sensor for aerospace applications as claimed in claim 2, wherein: The focal points of the axes of the two ultrasonic detection assemblies are located at the center of the lower end surface of the probe base, and when the liquid level does not reach the probe base, the reflection of ultrasonic waves reaches the strongest.

4. The ultrasonic liquid level sensor of claim 1, wherein, The ultrasonic detection assembly judges whether the liquid level reaches a predetermined position by detecting the strength of the ultrasonic waveforms received by the receiving end.

5. The ultrasonic liquid level sensor of claim 1, wherein, A retaining ring and a sealing ring are arranged between the probe base and the shell.

6. An ultrasonic liquid level sensor according to claim 1, wherein, A retaining ring and a sealing ring are arranged between the upper cover and the shell.

7. An ultrasonic liquid level sensor according to claim 1, characterized in that: The ultrasonic liquid level sensor is connected with the tank through the V-shaped flange on the shell and connected with the cable through the D38999 Ш series socket (6).

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