Water level measurement anti-interference structure

Abstract

The utility model discloses a water level measurement anti-interference structure which comprises a circuit board and a TOF sensor arranged on the circuit board through a detection installation base, the TOF sensor is provided with a light blocking block, and the light blocking block is used for separating the light source end and the light sensing end of the TOF sensor. Light of the light source end is prevented from being directly reflected or refracted to the light sensing end from water drops on the surface of the TOF sensor. The light blocking block is arranged between the light source end and the light sensing end of the TOF sensor, crosstalk caused by the cover plate and an air gap can be effectively blocked, and the sensitivity to the air gap, the thickness of the cover plate and the smoothness of the cover plate is low.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent drinking vessels, in particular to a water level measurement anti-interference structure. Background Art

[0002] With the development of intelligent technology, people have developed a variety of smart drinking water container products. Smart drinking water containers have integrated control chips, to which a display module for displaying time, a button module, an alarm module, a communication module, a storage module, and a variety of sensor devices are connected; thus, they have functions such as drinking water reminders, temperature detection, water volume detection, and water quality detection.

[0003] Existing smart drinking vessels generally offer flow sensing. Using various flow sensors or water level sensors, they can measure changes in the liquid within the cup, which can then be used to indicate how much water the user has drunk. Commonly used water level sensors include pressure and ultrasonic sensors. Due to the limitations of these two technologies, methods have been proposed for measuring water levels using optical distance sensors. These include methods that illuminate the object with a light spot, such as a laser, and triangulate the position of the reflected light, as well as TOF (Time of Flight) methods that measure the reflection time of the light pulse.

[0004] Because the TOF sensors used in some occasions are very small, the distance between the light source end and the photosensitive end of the TOF sensor is very close. When there are water droplets on the light path of the TOF sensor, such as water droplets on the surface of the transparent sheet, the light path will be reflected and refracted, causing abnormal data on the photosensitive end and resulting in large errors. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide an anti-interference structure for water level measurement, aiming to solve the technical problem that the existing TOF sensor water level measurement structure produces large errors due to the presence of water drops on the optical path.

[0006] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0007] A water level measurement anti-interference structure includes a circuit board and a time-of-flight sensor arranged on the circuit board via a detection mounting base. The TOF sensor is provided with a light blocking block, which is used to isolate the light source end and the photosensitive end of the TOF sensor to prevent light from the light source end from being directly reflected or refracted by water droplets on the surface of the TOF sensor to the photosensitive end.

[0008] Further, the anti-interference structure for water level measurement further includes a light-transmitting cover plate, which is disposed on the surface of the TOF sensor, covering the light source end and the photosensitive end.

[0009] Specifically, the detection mounting base is provided with a device mounting hole corresponding to the TOF sensor, and a light-transmitting mounting groove is arranged on the upper surface of the device mounting hole. The TOF sensor is attached to or close to the light-transmitting cover plate in the light-transmitting mounting groove through the device mounting hole.

[0010] Optionally, both ends of the light-transmitting cover plate are provided with cover plate connecting columns, and the cover plate connecting columns are arranged in the cover plate mounting holes in the detection mounting base.

[0011] Further, a light-blocking mounting groove is arranged on the light-transmitting cover plate, and the light-blocking block is arranged in the light-blocking mounting groove.

[0012] Specifically, the light-blocking block is integrally formed with the detection mounting base.

[0013] Optionally, the thickness of the light-blocking block is greater than the distance from the surface of the light-transmitting cover plate to the detection mounting base, and the width of the light-blocking block is greater than the width of the TOF sensor. Specifically, the light-blocking block is made of a light-impermeable material, with a thickness greater than 0.3 mm and a width greater than 2.0 mm.

[0014] Optionally, the thickness of the light-transmitting cover plate is less than 1.2 mm. The light-transmitting cover plate can be made of transparent or translucent glass, plastic, resin, quartz and other materials.

[0015] Advantages of the present utility model:

[0016] For the anti-interference structure for water level measurement in the embodiment of the present utility model, a light-blocking block is arranged between the light source end and the photosensitive end of the TOF sensor, which can effectively block the crosstalk caused by the cover plate and the air gap, and has low sensitivity to the air gap, the thickness of the cover plate and the surface finish of the cover plate. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0018] Figure 1 It is a three-dimensional exploded structure of the anti-interference structure for water level measurement of the present utility model Figure 1 ;

[0019] Figure 2The three-dimensional decomposition structure of the water level measurement anti-interference structure of the utility model Figure 2 ;

[0020] Figure 3 This is the main structural diagram of the water level measurement anti-interference structure of the utility model;

[0021] Figure 4 This is a cross-sectional structural diagram of the water level measurement anti-interference structure of the utility model;

[0022] Figure 5 This is a schematic diagram of the water level measurement anti-interference structure in use of the utility model;

[0023] In the figure, 10-water level measurement anti-interference structure,

[0024] 11-circuit board, 12-TOF sensor, 121-light source end, 122-light sensing end, 13-detection mounting seat, 131-light-transmitting mounting slot, 132-light-blocking block, 133-device mounting hole, 134-cover mounting hole, 14-light-transmitting cover, 141-light-blocking mounting slot, 142-cover connecting column;

[0025] 20-cup lid, 30-cup body, 40-liquid. DETAILED DESCRIPTION

[0026] The following further describes specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the descriptions of these embodiments are intended to aid understanding of the present invention and do not constitute limitations on the present invention. Furthermore, the technical features involved in the various embodiments of the present invention described below may be combined with one another as long as they do not conflict with one another.

[0027] Example 1

[0028] like Figures 1-4 As shown, an embodiment of the utility model provides an anti-interference structure 10 for water level measurement, including a circuit board 11, a TOF sensor 12 arranged on the circuit board 11 through a detection mounting base 13, and a light blocking block 132 is provided on the TOF sensor 12. The light blocking block 132 is used to separate the light source end 121 and the photosensitive end 122 of the TOF sensor 12 to prevent the light from the light source end 121 from being directly reflected or refracted from water droplets on the surface of the TOF sensor 12 to the photosensitive end 122.

[0029] The water level measurement anti-interference structure 10 further includes a light-transmitting cover plate 14 . The light-transmitting cover plate 14 is disposed on the surface of the TOF sensor 12 and covers the light source end 121 and the light-sensing end 122 .

[0030] Specifically, the detection mounting base 13 is provided with a device mounting hole 133 corresponding to the TOF sensor 12. A light-transmitting mounting groove 131 is provided on the upper surface of the device mounting hole 133. The TOF sensor 12 is attached to or close to a light-transmitting cover plate 14 within the light-transmitting mounting groove 131.

[0031] Optionally, two ends of the light-transmitting cover plate 14 are provided with cover plate connecting columns 142, and the cover plate connecting columns 142 are arranged in cover plate mounting holes 134 within the detection mounting base 13.

[0032] As Figure 2 shown, a light-blocking mounting groove 141 is provided on the light-transmitting cover plate 14, and the light-blocking block 132 is arranged in the light-blocking mounting groove 141.

[0033] Specifically, the light-blocking block 132 is integrally formed with the detection mounting base 13.

[0034] Optionally, the thickness of the light-blocking block 132 is greater than the distance from the surface of the light-transmitting cover plate 14 to the detection mounting base 13, and the width of the light-blocking block 132 is greater than the width of the TOF sensor 12. Specifically, the light-blocking block 132 is made of a light-impermeable material, with a thickness greater than 0.3 mm and a width greater than 2.0 mm. It can effectively block crosstalk caused by the cover plate and air gap, and has low sensitivity to air gap, cover plate thickness, and cover plate surface finish.

[0035] Optionally, the thickness of the light-transmitting cover plate 14 is less than 1.2 mm. The light-transmitting cover plate 14 can be made of transparent or translucent glass, plastic, resin, quartz, etc. The material has a transmittance of more than 87% in the near-infrared band of 940 - / +10 nm, and there is no requirement for the transmittance in other bands, preferably more than 90%. The surface is smooth without scratches, the surface finish is 60 / 40, and the haze is <5%.

[0036] As Figure 5 shown, during use, the water level measurement anti-interference structure 10 is arranged on the cup lid body 20, the cup lid body 20 is arranged in the cup body 30. Light rays emitted from the light source end of the TOF sensor 12 pass through the light-transmitting cover plate and enter the cup body 30. Reflection occurs on the surface of the liquid 40 in the cup body 30, and the light rays return to the light-sensitive end. The time difference between the emission of the light rays and the return of the light rays after being reflected by the object to the sensor allows the TOF sensor 12 to measure the distance between the liquid surface and the sensor.

[0037] In the water level measurement anti-interference structure of the embodiment of the present utility model, a light-blocking block is arranged between the light source end and the light-sensitive end of the TOF sensor, which can effectively block crosstalk caused by the cover plate and air gap, and has low sensitivity to air gap, cover plate thickness, and cover plate surface finish.

[0038] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings, but the present utility model is not limited to the described embodiments. For those skilled in the art, without departing from the principle and spirit of the present utility model, various changes, modifications, substitutions, and variations made to these embodiments still fall within the protection scope of the present utility model.

Claims

1. A water level measurement anti-interference structure, characterized in that It includes a circuit board and a TOF sensor arranged on the circuit board through a detection mounting base. The TOF sensor is provided with a light blocking block, which is used to separate the light source end and the photosensitive end of the TOF sensor to prevent the light from the light source end from being directly reflected or refracted by water droplets on the surface of the TOF sensor to the photosensitive end.

2. The anti-interference structure for water level measurement according to claim 1, wherein The water level measurement anti-interference structure further includes a light-transmitting cover plate, which is arranged on the surface of the TOF sensor and covers the light source end and the light-sensing end.

3. The water level measurement anti-interference structure according to claim 2, characterized in that: The detection mounting seat is provided with a device mounting hole corresponding to the TOF sensor, and a light-transmitting mounting groove is provided on the upper surface of the device mounting hole. The TOF sensor is attached to or close to the light-transmitting cover plate in the light-transmitting mounting groove through the device mounting hole.

4. The water level measurement anti-interference structure according to claim 3, characterized in that: Cover plate connecting posts are provided at both ends of the light-transmitting cover plate, and the cover plate connecting posts are provided in the cover plate mounting holes in the detection mounting seat.

5. The anti-interference structure for water level measurement according to claim 2, characterized in that A light-blocking installation groove is provided on the light-transmitting cover plate, and the light-blocking block is provided in the light-blocking installation groove.

6. The water level measurement anti-interference structure according to claim 5, characterized in that: The light blocking block and the detection mounting seat are integrally formed.

7. The anti-interference structure for water level measurement according to claim 2, wherein The thickness of the light blocking block is greater than the distance from the surface of the light-transmitting cover plate to the detection mounting seat, and the width of the light blocking block is greater than the width of the TOF sensor.

8. The water level measurement anti-interference structure according to claim 2, characterized in that: The thickness of the light-transmitting cover plate is less than 1.2 mm.

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