Millimeter wave liquid level detection sensor

Abstract

A millimeter wave liquid level detection sensor comprises a shell, a bottom cover, a circuit mainboard, a waterproof ring and a double faced adhesive tape, a bottom opening is formed in the bottom of the shell, and the bottom cover covers the bottom opening; the bottom cover is provided with a millimeter wave lens and a waterproof ring mounting groove, the circuit mainboard is fixed on the bottom cover, the waterproof ring is mounted in the waterproof ring mounting groove, and the double faced adhesive tape is arranged at the bottom of the bottom cover; the circuit mainboard comprises an anti-static circuit, a power supply voltage stabilizing circuit, a communication circuit, a millimeter wave radar circuit and a processor, the anti-static circuit, the communication circuit, the processor and the millimeter wave radar circuit are connected in sequence, the power supply voltage stabilizing circuit provides power for the millimeter wave radar circuit and the processor, and the power supply voltage stabilizing circuit and the anti-static circuit are connected with the client use port. According to the utility model, important functional parts are designed on the bottom cover and are separated from the shell main body, so that the important functional parts can be conveniently integrated into small equipment, and the advantage of small size is taken into account; the cost is low; the reliability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of millimeter-wave liquid level detection, and particularly relates to a millimeter-wave liquid level detection sensor. Background Art

[0002] Existing non-contact measurement methods include infrared ranging, laser ranging, ultrasonic ranging, millimeter-wave ranging, etc. Infrared ranging has high requirements for ambient light and the color of the measured object. Laser ranging has high requirements for the working environment and is easily affected by light and color. Ultrasonic ranging cannot penetrate plastics and requires holes to be drilled on the tank body for installation, making maintenance difficult. Existing millimeter-wave ranging has a large volume, which is not conducive to integration into small intelligent devices, and has a high cost, which is not conducive to popularization and promotion. Summary of the Invention

[0003] The purpose of the utility model is to provide a millimeter-wave liquid level detection sensor, which solves the problems of being not conducive to integration and having high requirements for the installation environment, etc.

[0004] The purpose of the utility model can be realized in this way. Design a millimeter-wave liquid level detection sensor, which includes a housing, a bottom cover, a circuit main board, a waterproof ring, and double-sided tape. The bottom of the housing is provided with a bottom opening, and the bottom cover covers the bottom opening;

[0005] The bottom cover is provided with a millimeter-wave lens and a waterproof ring installation groove. The circuit main board is fixed on the bottom cover, the waterproof ring is installed in the waterproof ring installation groove, and the double-sided tape is arranged at the bottom of the bottom cover;

[0006] The circuit main board includes an anti-static circuit, a power supply voltage stabilization circuit, a communication circuit, a millimeter-wave radar circuit, and a processor. The anti-static circuit, the communication circuit, the processor, and the millimeter-wave radar circuit are connected in sequence. The power supply voltage stabilization circuit provides power for the millimeter-wave radar circuit and the processor. The power supply voltage stabilization circuit and the anti-static circuit are connected to the customer use port.

[0007] Further, the millimeter-wave lens is integrated in the bottom cover and is in a ring-shaped stepped shape.

[0008] Further, the ring-shaped step has 4 steps.

[0009] Further, the main body of the housing is in a semi-cylindrical shape.

[0010] Further, there are two waterproof rings between the housing and the bottom cover, namely a first waterproof ring and a second waterproof ring.

[0011] Further, the waterproof ring installation groove includes a first waterproof ring installation groove and a second waterproof ring installation groove. The first waterproof ring installation groove is provided on the outer circumferential wall of the bottom cover, and the second waterproof ring installation groove is provided on the inner circumferential wall of the bottom cover. The outer circumferential wall of the housing and the inner circumferential wall of the housing are correspondingly provided on the housing. The first waterproof ring is arranged between the outer circumferential wall of the housing and the outer circumferential wall of the bottom cover, and the second waterproof ring is arranged between the inner circumferential wall of the housing and the inner circumferential wall of the bottom cover.

[0012] Further, the double-sided tape is a circular double-sided tape.

[0013] Further, a waterproof connector is provided on the housing.

[0014] Further, an installation platform is provided at the waterproof connector installation part of the housing. A waterproof connector installation hole is provided on the housing. A thread is provided on the installation interface of the waterproof connector. The waterproof connector is fixed on the waterproof connector installation hole through a fastening nut.

[0015] The installation surface of the utility model is designed with a circular double-sided tape, and the installation is simple. The important functional components are designed on the bottom cover (millimeter-wave lens, circuit main board) and separated from the housing body, which is convenient to integrate the important functional components into small devices, taking into account the advantage of small volume; small blind area; high precision; high measurement stability; low cost; high waterproof level; long service life and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a preferred embodiment of the utility model;

[0017] Figure 2 is a cross-sectional schematic diagram of a preferred embodiment of the utility model;

[0018] Figure 3 is an exploded schematic diagram of a preferred embodiment of the utility model;

[0019] Figure 4 is a cross-sectional schematic diagram of the housing of a preferred embodiment of the utility model;

[0020] Figure 5 is a cross-sectional schematic diagram of the bottom cover of a preferred embodiment of the utility model;

[0021] Figure 6 is a principle block diagram of a preferred embodiment of the utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following further describes the utility model in conjunction with embodiments.

[0023] As Figures 1 to 5 shown, a millimeter-wave liquid level detection sensor includes a housing 2, a bottom cover 7, a circuit main board 6, a waterproof ring, and a double-sided tape 9. The bottom of the housing 2 is provided with a bottom opening, and the bottom cover 7 covers the bottom opening;

[0024] The bottom cover 7 is provided with a millimeter-wave lens 10 and a waterproof ring installation groove. The circuit main board 6 is fixed on the bottom cover 7. The waterproof ring is installed in the waterproof ring installation groove. The double-sided tape 9 is arranged at the bottom of the bottom cover 7;

[0025] The circuit main board 6 includes an anti-static circuit 64, a power supply voltage stabilization circuit 65, a communication circuit 63, a millimeter-wave radar circuit 61, and a processor 62. The anti-static circuit 64, the communication circuit 63, the processor 62, and the millimeter-wave radar circuit 61 are connected in sequence. The power supply voltage stabilization circuit 65 provides power for the millimeter-wave radar circuit 61 and the processor 62. The power supply voltage stabilization circuit 65 and the anti-static circuit 64 are connected to the customer use port 66. The anti-static circuit 64 protects the processor 62 from static electricity pouring into the processor 62; the power supply voltage stabilization circuit 65 completes the processing of the external power input and the power supply for each internal part of the circuit; the communication circuit 64 completes the communication between the sensor and the external device; the millimeter-wave radar circuit 61 completes the signal processing between the processor 62 and the millimeter-wave radar; the processor 62 completes the instruction issuance, signal acquisition, signal processing, and signal output; the processor 62 processes the signals returned by each circuit to achieve stable liquid level detection.

[0026] The millimeter-wave lens 10 is integrated on the bottom cover 7 and is in a ring-shaped stepped shape. The ring-shaped step has 4 steps for focusing millimeter-wave signals and amplifying signals.

[0027] The main body of the housing 2 is in a semi-cylindrical shape with an open bottom and a cylindrical cavity in the middle for installing the waterproof connector 1, the bottom cover 7, and the bottom cover fixing screw 8.

[0028] As Figure 4 、 Figure 5 shown, in order to ensure the waterproof level, there are two waterproof rings, the first waterproof ring 3 and the second waterproof ring 4, between the housing 2 and the bottom cover 7. The waterproof ring installation groove includes a first waterproof ring installation groove 71 and a second waterproof ring installation groove 72. The first waterproof ring installation groove 71 is arranged on the outer wall of the bottom cover. The first waterproof ring 3 is installed in the first waterproof ring installation groove 71; the second waterproof ring installation groove 72 is arranged on the inner wall of the bottom cover. The second waterproof ring 4 is installed in the second waterproof ring installation groove 72. On the housing 2, the outer wall 21 of the housing and the inner wall 22 of the housing are correspondingly arranged. The first waterproof ring 3 is arranged between the outer wall 21 of the housing and the outer wall of the bottom cover, and the second waterproof ring 4 is arranged between the inner wall 22 of the housing and the inner wall of the bottom cover. As Figure 2 、 Figure 3 、 Figure 4As shown, the waterproof connector 1 is installed on the housing 2 for waterproofing the overall structure and the connecting wire. The housing 2 is provided with an installation platform 24 at the waterproof connector installation site, and a waterproof connector installation hole 25 is provided on the housing 2. The installation interface of the waterproof connector 1 is provided with a thread, and the waterproof connector 1 is fixed on the waterproof connector installation hole 25 through a fastening nut 11. The setting of the installation platform 24 enables the overall external dimensions of the housing 2 to have no large change after installing the waterproof connector 1, and the overall occupied volume is small. The waterproof effect of this embodiment can reach IP67 level.

[0029] As Figure 2 , 3 shown, the double-sided tape 9 is a circular double-sided tape, which is convenient for installing the product on the surface of the target object.

[0030] The working principle of the present utility model is as follows: As Figure 6 shown, the sensor is powered on to supply power to each circuit; the processor 62 starts initialization to ensure that each circuit works normally; the processor 62 sends an instruction to the millimeter-wave radar circuit 61; the millimeter-wave radar emits a millimeter-wave signal; the millimeter-wave radar circuit 61 waits to receive the returned millimeter-wave signal; the millimeter-wave radar circuit 61 returns the received signal to the processor 62; the processor 62 screens the target echo from the returned signal; the processor 62 calculates the distance value according to the time of the target echo combined with the speed of light; the processor 62 compares and processes the calculated distance value with the latest data; the processor 62 transmits the processed data to the client through the customer use port 66, and returns a sending instruction to the millimeter-wave radar circuit to repeat the subsequent steps.

[0031] The measuring range of this embodiment is 300 cm, the angle is about 15°, and the blind area is ≤ 6 cm. It is specially designed for liquid level detection, with high measurement stability and high accuracy, meeting the requirements of liquid level detection of ton barrels.

[0032] The present utility model is applied to the liquid level detection of IBC ton barrels. It adopts non-contact liquid level measurement technology and is installed on the surface of the IBC ton barrel. There is no need to open holes to damage the tank body. The radar signal can directly penetrate the plastic shell and measure the distance from the sensor to the liquid surface from top to bottom. When the sensor detects the liquid surface, it transmits the distance value of the liquid surface back to the host, and the host can obtain the current liquid level height in the IBC ton barrel according to the distance value returned by the sensor.

[0033] The utility model has a dustproof and waterproof design for the whole machine, and the waterproof effect can reach IP67 level, which makes the whole machine have good waterproof performance. The millimeter wave lens and the circuit main board are designed on the bottom cover. When the user needs to integrate the sensor into the device, only the bottom cover with the circuit main board can be integrated into the device, which occupies a small volume. When the user does not need to integrate the entire sensor into the device, the sensor can be used as a whole and connected to the device through a cable. The structure has a simple appearance and a small size. When installing, you only need to use the double-sided tape that comes with the sensor to stick it on the surface of the tank. After the device is connected and outputs data normally, the installation is completed; the subsequent maintenance operation is simple, which reduces the cost of installation and maintenance.

Claims

1. A millimeter wave liquid level detection sensor, characterized in that: It includes a shell, a bottom cover, a circuit board, a waterproof ring, and a double-sided adhesive tape. The bottom of the shell is provided with a bottom opening, and the bottom cover covers the bottom opening. The bottom cover is provided with a millimeter wave lens and a waterproof ring installation groove, the circuit main board is fixed on the bottom cover, the waterproof ring is installed in the waterproof ring installation groove, and the double-sided tape is arranged at the bottom of the bottom cover; The circuit main board includes an anti-static circuit, a power stabilizing circuit, a communication circuit, a millimeter-wave radar circuit, and a processor. The anti-static circuit, the communication circuit, the processor, and the millimeter-wave radar circuit are connected in sequence. The power stabilizing circuit provides power for the millimeter-wave radar circuit and the processor. The power stabilizing circuit and the anti-static circuit are connected to the port used by the customer.

2. The millimeter wave liquid level detection sensor according to claim 1, characterized in that: The millimeter wave lens is integrated into the bottom cover in a circular stepped shape.

3. The millimeter wave liquid level detection sensor according to claim 2, characterized in that: The circular staircase has 4 steps.

4. The millimeter wave liquid level detection sensor according to claim 1, characterized in that: The shell body is in the shape of a semi-circular barrel.

5. The millimeter wave liquid level detection sensor according to claim 1, characterized in that: Two waterproof rings are arranged between the shell and the bottom cover, namely a first waterproof ring and a second waterproof ring.

6. The millimeter wave liquid level detection sensor according to claim 5, characterized in that: The waterproof ring installation groove includes a first waterproof ring installation groove and a second waterproof ring installation groove. The first waterproof ring installation groove is arranged on the outer ring wall of the bottom cover, and the second waterproof ring installation groove is arranged on the inner ring wall of the bottom cover. The outer ring wall of the shell and the inner ring wall of the shell are correspondingly arranged on the shell. The first waterproof ring is arranged between the outer ring wall of the shell and the outer ring wall of the bottom cover, and the second waterproof ring is arranged between the inner ring wall of the shell and the inner ring wall of the bottom cover.

7. The millimeter wave liquid level detection sensor according to claim 1, characterized in that: The double-sided tape is a ring-shaped double-sided tape.

8. The millimeter wave liquid level detection sensor according to claim 1, characterized in that: A waterproof connector is provided on the shell.

9. The millimeter wave liquid level detection sensor according to claim 8, characterized in that: The shell is provided with an installation platform at the installation position of the waterproof joint, the shell is provided with a waterproof joint installation hole, the installation interface of the waterproof joint is provided with a thread, and the waterproof joint is fixed to the waterproof joint installation hole by a fastening nut.

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