Ultrasonic water quantity monitoring device

Abstract

The utility model belongs to the field of monitoring devices, and discloses an ultrasonic water quantity monitoring device, which adopts an ultrasonic liquid level meter as a non-contact measuring meter, and can avoid the problem that the traditional contact liquid level meter is easy to corrode, pollute or erode by liquid, thereby prolonging the service life of equipment and improving the measuring accuracy of the equipment. And the ultrasonic technology can realize high-precision liquid level measurement, and is not influenced by factors such as density, temperature and pressure change of a liquid medium, so that the stability and the reliability of measurement are ensured. The liquid level meter is fixed on the upper cover of the water tank through the adapter plate, the installation process is simple and fast, the water tank does not need to be greatly transformed or additionally operated, the installation cost and time are reduced, and due to the non-contact property and the high durability of the liquid level meter, the maintenance frequency and the replacement cost are reduced, and the overall operation and maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of monitoring device, more particularly to an ultrasonic water quantity monitoring device. BACKGROUND

[0002] The fire-fighting aircraft needs to accurately grasp the water quantity in the water storage tank to ensure the fire-fighting effect and flight safety when extinguishing forest fires and other large-area fires. The existing water quantity monitoring device mainly measures through the float type, water pressure type and other methods, but these methods have many shortcomings in the application of the fire-fighting aircraft. The float type sensor is easily affected by impurities in the water, and the measurement accuracy is low; the water pressure type sensor is greatly affected by pressure fluctuations, and needs to be regularly maintained. In addition, the water storage tank of the fire-fighting aircraft needs to work in a harsh flight environment, and requires the water quantity monitoring device to have high precision, fast response, high vibration resistance and high impact resistance and other characteristics. Although the existing ultrasonic water quantity monitoring technology has the advantages of high precision, fast response and easy maintenance, it still has shortcomings in structure design, protection level and signal processing. For example, some devices perform poorly in harsh environments such as high vibration and high humidity, and the measurement accuracy and stability need to be improved. Therefore, it is particularly important to develop a new type of ultrasonic water quantity monitoring device, especially for the application scenario of the water storage tank of the fire-fighting aircraft. SUMMARY

[0003] The utility model aims at overcoming the above-mentioned measurement accuracy is low and the shortage of high maintenance cost, provides an ultrasonic water quantity monitoring device.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] The utility model provides an ultrasonic water quantity monitoring device, including liquid level meter, liquid level meter is fixed on the water tank upper cover through the adapter plate, is set up with the through -hole on the water tank upper cover, and the measurement end of liquid level meter is towards the measurement liquid surface in the water tank through the through -hole.

[0006] The utility model further improves, and liquid level meter includes ultrasonic transducer, and the ultrasonic transducer includes piezoelectric ceramic, and the radiation surface of piezoelectric ceramic is bonded with flange electrode, and the radiation surface of piezoelectric ceramic is pasted with organic glass, and the back of piezoelectric ceramic is provided with hard back lining.

[0007] The utility model further improves, and the center frequency of sound wave transducer is 160KHz.

[0008] The utility model further improves, and the through -hole of the water tank upper cover is inserted into the through -hole of the water tank upper cover, and the through -hole of the water tank upper cover is sealed by glue sticking.

[0009] The utility model further improves, and liquid level meter sets up in liquid level meter shell.

[0010] The further improvement of the utility model lies in that the top of the liquid level meter shell is provided with an output interface, and a sealing ring is arranged in the output interface.

[0011] The further improvement of the utility model lies in that the shape of the liquid level meter shell is a reverse cup structure, and the inner cavity of the liquid level meter shell is a horn-shaped inner cavity.

[0012] The further improvement of the utility model lies in that a sealing ring is arranged between the adapter plate and the upper cover of the water tank.

[0013] The further improvement of the utility model lies in that the liquid level meter is connected with a power supply, a power supply processing circuit is arranged between the liquid level meter and the power supply, the power supply processing circuit comprises an EMI filter circuit and a DC / DC circuit, the EMI filter circuit is connected with the DC / DC circuit, the EMI filter circuit is connected with the power supply, and the DC / DC circuit is connected with the liquid level meter.

[0014] The further improvement of the utility model lies in that the adapter plate and the upper cover of the water tank are connected through screws, and flat washers and spring washers are arranged on the screws.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The utility model adopts the ultrasonic liquid level meter as the non-contact measurement meter mode, can avoid the problem that the traditional contact liquid level meter is easy to be corroded, polluted or eroded by liquid, thereby improving the service life and measurement precision of the equipment, and the ultrasonic technology can realize high-precision liquid level measurement and is not affected by factors such as liquid medium density, temperature and pressure change, thereby guaranteeing the stability and reliability of measurement.

[0017] Further, the piezoelectric ceramic of the utility model has a folded electrode bonded on the radiation surface, which helps to optimize the vibration mode of the piezoelectric ceramic, reduces unnecessary vibration and energy loss, and improves the directivity and efficiency of ultrasonic emission.

[0018] Further, the through hole of the organic glass of the utility model and the upper cover of the water tank are sealed by point sealing, which can effectively prevent liquid from leaking from the inside of the water tank through the through hole, ensure the sealing property of the liquid level meter, and avoid loss or equipment failure caused by liquid leakage.

[0019] Further, the liquid level meter is arranged in the liquid level meter shell, IP67 protection level can be realized, and stable work of the device in a severe environment such as high humidity and high dust is ensured.

[0020] Further, the liquid level meter shell is in a reverse cup type structure, and the inner cavity is in a horn-shaped inner cavity, so that the transmission and receiving path of the ultrasonic signal is optimized, signal attenuation is reduced, and the measurement precision is improved.

[0021] Further, the power supply processing circuit adopts an EMI filter circuit and a DC / DC circuit, so that the stability and anti-interference capability of the power supply are ensured.

[0022] Further, the adapter plate and the water tank upper cover are connected through screws, and flat washers and spring washers are arranged on the screws, so that the stability of the device in a high-vibration environment is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic view of the utility model;

[0024] Figure 2 is a cooperation schematic view of the liquid level meter and the water tank upper cover in the utility model;

[0025] Figure 3 is a schematic view of the liquid level meter shell in the utility model;

[0026] Figure 4 is a schematic view of the ultrasonic transducer in the utility model;

[0027] Figure 5 is a schematic view of the power supply unit in the utility model;

[0028] 1, liquid level meter; 2, adapter plate; 3, water tank upper cover; 4, water tank; 5, piezoelectric ceramic; 6, flange electrode; 7, organic glass; 8, hard backing; 9, liquid level meter shell; 10, output interface. DETAILED DESCRIPTION

[0029] In order to further understand the content of the utility model, the following will be combined with the drawings and specific embodiments to make a detailed description of the utility model. It should be understood that the embodiments are only used to explain the utility model and are not limited. As can be recognized by those skilled in the art, the described embodiments can be modified in various different ways without departing from the spirit or scope of the utility model. Therefore, the drawings and the description are considered to be exemplary in nature and not limited.

[0030] Embodiment 1:

[0031] Reference Figure 1and Figure 2 An ultrasonic water quantity monitoring device, comprising a liquid level meter 1, the liquid level meter 1 is fixed on the water tank upper cover 3 through the adapter plate 2, the water tank upper cover 3 is provided with a through hole, and the measuring end of the liquid level meter 1 is directed to the measuring liquid surface in the water tank 4 through the through hole.

[0032] Embodiment 2:

[0033] Referring to Figure 4 The embodiment further limits the specific structure of the liquid level meter 1 in embodiment 1, the liquid level meter 1 comprises an ultrasonic transducer, the ultrasonic transducer comprises a piezoelectric ceramic 5, a flange electrode 6 is bonded on the radiation surface of the piezoelectric ceramic 5, a plexiglass 7 is pasted on the radiation surface of the piezoelectric ceramic 5, and a hard backing 8 is arranged at the back of the piezoelectric ceramic 5, which is generally epoxy resin filling glue mixed with materials such as aluminum oxide, tungsten powder and glass beads to adjust the density and sound velocity, so that the transducer has the highest sensitivity. The ultrasonic transducer realizes the control of receiving and transmitting by time sharing through analog switch.

[0034] The working principle of ultrasonic ranging is that the ultrasonic transducer sends out high-frequency pulse sound waves, the pulse sound waves meet the measured object (the surface is reflected back to reflect the echo, and the echo is converted into an electric signal after being received by the transducer. The propagation time of the sound wave is proportional to the distance from the sound wave to the surface of the object, and the relationship between the sound transmission distance S and the sound velocity C and the sound transmission time T can be expressed by the formula: S=C×T / 2.

[0035] In this embodiment, the silver electrode of the radiation surface is introduced to the back by the flange electrode, which maintains the flatness of the radiation surface of the piezoelectric ceramic 5 and can ensure the transmission efficiency of the vibration displacement. The problem of the flange electrode is that the flange part of the piezoelectric ceramic does not participate in the vibration, and as a load, it will lose part of the energy. Therefore, under the premise of ensuring the wire bonding space, the flange area is as small as possible, which is one of the key points of electrode design. In this embodiment, the plexiglass 7 is directly machined into a shape, which is bonded to the piezoelectric ceramic by epoxy glue, so as to ensure the uniformity of the sound wave propagation time of the radiation surface.

[0036] The time difference t from the sending to the receiving of the ultrasonic transducer is proportional to the liquid level height h, according to the above-mentioned principle, the liquid level height h' can be calculated. The height of the whole water tank is H, which is a known quantity, then the liquid level height h' = H-h. Then the actual liquid level height value can be obtained, and the actual water quantity can be obtained by measuring the liquid level height.

[0037] Preferably, the center frequency of the sound wave transducer is 160KHz.

[0038] Embodiment 3:

[0039] Referring to Figure 2 and Figure 3The embodiment further limits the sealing mode of the liquid level meter 1 in Embodiment 1, and the liquid level meter 1 is arranged in the liquid level meter shell 9. The organic glass 7 extends into the through hole of the water tank upper cover 3, and the through hole of the organic glass 7 and the water tank upper cover 3 is sealed by dispensing. The top of the liquid level meter shell 9 is provided with an output interface 10, and a sealing ring is arranged in the output interface. A sealing ring is arranged between the adapter plate 2 and the water tank upper cover 3. The adapter plate 2 and the water tank upper cover 3 are connected by screws, and the screws are provided with flat washers and spring washers. The liquid level meter shell 9 is fixed to the center of the top of the water tank.

[0040] The embodiment adopts an advanced sealing process to ensure that the device works stably in harsh environments such as high humidity and high dust. Experimental test results show that under the IP67 standard, the device can withstand 1 meter water immersion for 30 minutes without leakage. The structure ensures the stability of the device in a high-vibration environment. Dynamic balance test shows that the device has a water measurement accuracy of ≯2% in a vibration environment of 50Hz and 2g acceleration. Through environmental simulation testing and customized design, the device can adapt to different extreme environments, including high temperature, low temperature, high pressure, etc. Experimental data show that the device has a water measurement accuracy of ≯2% in an environment of -40℃ to 85℃.

[0041] During the filling process of the water storage tank, the liquid level meter shell 9 and the key components inside are designed with multiple overpressure protection structures, and a leakage hole is also designed to ensure that the pressure does not suddenly change during the filling process, avoiding damage to the measuring device due to sudden pressure changes. Overpressure protection experiments show that the device works for 30 minutes without damage under 2 times the rated pressure.

[0042] The liquid level meter 1 and the adapter plate 2 are connected through a standardized flange interface, which is convenient for quick disassembly and maintenance. The standardized flange interface design makes the device have higher compatibility and replaceability in different application scenarios.

[0043] Embodiment 4:

[0044] The embodiment further limits the shape of the liquid level meter shell 9 in Embodiment 3. The liquid level meter shell 9 has an inverted cup structure with a height of 200mm. The inner cavity of the liquid level meter shell 9 is a horn-shaped cavity with a top diameter of 140mm and an outer diameter. This shape can optimize the transmission and reception path of ultrasonic signals, reduce signal attenuation, and improve measurement accuracy.

[0045] During the flight, there is a pressure difference of 30-50KPA between the inner and outer cavities of the liquid level meter shell 9. In order to maintain the stability and sealing of the structure, the liquid level meter shell 9 is designed as an integral type, and the material thickness is designed to meet the pressure difference between the inner and outer cavities. The sealing gasket and sealing glue meet the sealing requirements of the site pressure difference.

[0046] Embodiment 5:

[0047] Referring toFigure 5 The power supply of the liquid level meter 1 is further limited in the embodiment, the liquid level meter 1 is connected to a power supply, a power supply processing circuit is arranged between the liquid level meter 1 and the power supply, the power supply processing circuit comprises an EMI filter circuit and a DC / DC circuit, the EMI filter circuit is connected to the DC / DC circuit, the EMI filter circuit is connected to the power supply, and the DC / DC circuit is connected to the liquid level meter 1. The power supply processing circuit ensures the stability of the power supply and the anti-interference capability. Test data shows that the signal error of the device is less than 0.01% in a 500V / m electromagnetic interference environment.

[0048] The input voltage of the liquid level meter 1 is +28V, a DC-DC chip (SGM61720 input range 9V-36V, maximum current 2.5A) with a wide voltage range input is adopted, the 28V voltage signal is converted into a usable 5V voltage, and then a 3.3V voltage is generated through a first LDO voltage stabilizing chip for power supply.

[0049] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above, for those skilled in the art, obviously, the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic features of the utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims rather than the above description, therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0050] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be combined appropriately to form other embodiments that those skilled in the art can understand. The above content only illustrates the technical idea of the utility model, and cannot limit the protection scope of the utility model, any modification made on the basis of the technical solutions according to the technical idea of the utility model falls within the protection scope of the claims of the utility model.

Claims

1. An ultrasonic water quantity monitoring device, characterized by, The liquid level meter (1) is fixed on the water tank upper cover (3) through the adapter plate (2), the water tank upper cover (3) is provided with a through hole, and the measuring end of the liquid level meter (1) is directed to the measuring liquid surface in the water tank (4) through the through hole.

2. The ultrasonic water monitoring device of claim 1, wherein, The liquid level meter (1) comprises an ultrasonic transducer, the ultrasonic transducer comprises a piezoelectric ceramic (5), the piezoelectric ceramic (5) is bonded with a flange electrode (6) on the radiation surface, the piezoelectric ceramic (5) is pasted with plexiglass (7), and the back of the piezoelectric ceramic (5) is provided with a hard backing (8).

3. The ultrasonic water monitoring device of claim 2, wherein, The center frequency of the ultrasonic transducer is 160 KHz.

4. The ultrasonic water monitoring device of claim 2, wherein, The plexiglass (7) extends into the through hole of the water tank upper cover (3), and the through hole passing point of the plexiglass (7) and the water tank upper cover (3) is sealed by glue.

5. The ultrasonic water usage monitoring device of claim 1, wherein, The liquid level meter (1) is arranged in the liquid level meter shell (9).

6. An ultrasonic water volume monitoring device according to claim 5, wherein, The top of the liquid level meter shell (9) is provided with an output interface (10), and the output interface is provided with a sealing ring.

7. The ultrasonic water usage monitoring device of claim 5, wherein, The outer shape of the liquid level meter shell (9) is a reverse cup structure, and the inner cavity of the liquid level meter shell (9) is a horn-shaped cavity.

8. The ultrasonic water usage monitoring device of claim 1, wherein, The adapter plate (2) and the water tank upper cover (3) are provided with a sealing ring therebetween.

9. The ultrasonic water usage monitoring device of claim 1, wherein, The liquid level meter (1) is connected with a power supply, and a power supply processing circuit is arranged between the liquid level meter (1) and the power supply, the power supply processing circuit comprises an EMI filter circuit and a DC / DC circuit, the EMI filter circuit is connected with the DC / DC circuit, the EMI filter circuit is connected with the power supply, and the DC / DC circuit is connected with the liquid level meter (1).

10. The ultrasonic water usage monitoring device of claim 1, wherein, The adapter plate (2) and the water tank upper cover (3) are connected through screws, and the screws are provided with flat washers and spring washers.

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