Flexible digital liquid level sensor
By installing a filter cartridge and cleaning components on the liquid level sensor, the problem of dirt adhesion in sewage is solved, enabling high-precision monitoring of the liquid level and long-term stable operation of the device, while reducing costs.
Patent Information
- Application Number
- CN202511334869.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-18
- Publication Date
- 2025-11-07
AI Technical Summary
Impurities in wastewater can easily adhere to the surface of flexible liquid level sensors, affecting the accuracy of liquid level monitoring.
A filter cartridge is installed outside the test rod of the liquid level sensor, combined with scraping and aeration cleaning components. The filter cartridge is used to intercept dirt, the scraping cleaning component removes surface dirt with bristles, and the aeration cleaning component uses airflow to clean the inside of the filter cartridge, thus achieving effective cleaning of dirt.
Effectively intercepting and removing contaminants ensures the accuracy of liquid level monitoring and the long-term stability of the device, while reducing production and operating costs.
Smart Images
Figure CN120907633A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of liquid level sensors, in particular to a flexible digital liquid level sensor. BACKGROUND
[0002] A liquid level sensor is a device used to monitor, maintain and measure the level of liquid (sometimes solid). The core principle of a flexible liquid level sensor is to use the physical deformation of the sensor itself to detect changes in liquid level. It is usually designed as a flexible, long strip structure, which contains sensitive elements that can sense bending or pressure changes. When the sensor is immersed in liquid, the hydrostatic pressure or buoyancy will cause the sensor to bend, and this deformation is converted into an electrical signal to determine the liquid level.
[0003] The liquid level sensor can also be used to monitor sewage, that is, the sensor has a long and flexible light guide tube inside. One end of the light guide tube is connected to an infrared LED light source and a light-sensitive receiver, and the other end is sealed. In the air: the infrared light emitted by the LED is transmitted in the light guide tube in a fully reflective manner, and most of the light can be detected by the receiver at the other end, outputting a high-level signal; when immersed in sewage: the refractive index of sewage is different from that of air. When the sensor is immersed in liquid, the total reflection condition of the light guide tube is destroyed, and the infrared light will refract out of the light guide tube and into the liquid. The light reaching the receiving end is greatly weakened.
[0004] Therefore, the change in light intensity detected by the receiver is recognized by the circuit, outputting a low-level signal. The length of the sensor immersed in the liquid is different, and the loss of light intensity sensed by the receiving end is also different. Through calibration, the continuous liquid level height can be calculated.
[0005] However, there are still the following defects and deficiencies in the implementation and application process: Because it is used in sewage, the sewage itself contains a lot of dirt, which causes the surface of the test component to easily adhere to oil stains and viscous sludge, thereby affecting the monitoring of the liquid level.
[0006] Therefore, it is necessary to provide a new flexible digital liquid level sensor to solve the above technical problems. SUMMARY
[0007] To solve the above technical problems, the present application provides a flexible digital liquid level sensor.
[0008] The flexible digital liquid level sensor provided by the present application comprises a display body, a test rod is installed on the display body, and further comprises: A filter cartridge is fixed on the test rod and is arranged concentrically with the test rod, and has a gap between the two; The scraping cleaning assembly is installed on the test rod and consists of a driving part and a cleaning part, the cleaning part contacts the outer wall of the filter cylinder and can rotate along the circumferential direction of the filter cylinder. The aeration cleaning assembly is installed on the test rod and consists of a driving part and a gas supply part, the driving part is in transmission connection with the driving part of the scraping cleaning assembly, and the gas generated by the gas supply part is injected into the filter cylinder.
[0009] Preferably, a positioning disc is fixed on the test rod and close to the display body, and a base is fixed on the other end of the test rod, the base has a cavity inside and is provided with an air outlet at the gap between the test rod and the filter cylinder.
[0010] Preferably, the filter cylinder has a pore size of 0.1-10 μm and a whole boss shape, the upper end has a smaller diameter than the lower end, and the two ends are respectively fixed on the positioning disc and the base.
[0011] Preferably, the driving part includes a positioning foot stand fixed on the positioning disc, a motor fixed on the positioning disc, a transmission shaft fixed on the output end of the motor through a shaft coupling, and a driving gear fixed on the other end of the transmission shaft and arranged concentrically. A driven gear ring arranged concentrically is also rotationally connected on the filter cylinder and in meshing transmission with the driving gear.
[0012] Preferably, the cleaning part is a plurality of parts arranged annularly on the outside of the filter cylinder and includes a positioning plate, the positioning plate is screw-fixed on one end of the driven gear ring, one side of the positioning plate has a plurality of brush hairs arranged linearly and obliquely, the brush hairs contact the outer wall of the filter cylinder to scrape off the dirt attached to the outside of the filter cylinder.
[0013] Preferably, the driving part includes a transmission cylinder, the transmission cylinder is sleeved on the outside of the transmission shaft and can move axially relative to the transmission shaft, the transmission cylinder has a wavy track groove on the circumferential inner wall, and a transmission pin is welded on the circumferential outer wall of the transmission shaft and slides in the track groove.
[0014] Preferably, the transmission cylinder has a first positioning plate integrally connected on one end, a second positioning plate is welded and fixed on the positioning foot stand, and a light rod is fixed between the positioning foot stand and the second positioning plate, the light rod penetrates the first positioning plate and is in sliding connection with the first positioning plate.
[0015] Preferably, the gas supply part includes two annular seats arranged concentrically, a stretchable air bag is fixed between the two annular seats to form a closed cavity inside the annular seats and the stretchable air bag, the two annular seats are respectively provided with an air inlet and an air outlet and are respectively installed with a first one-way valve and a second one-way valve, and the second one-way valve is installed with a first air guide pipe. A second air duct is also fixed on the base, one end of the second air duct is closed and the other end has an opening, the opening end communicates with the internal cavity of the base, and the outer wall of the second air duct and the position close to the closed end have an air nozzle connected with the first air duct.
[0016] Preferably, a bearing seat is fixed at the closed end of the second air duct, and the bearing seat is connected with the transmission shaft.
[0017] Compared with the related art, the flexible digital liquid level sensor has the following beneficial effects: 1. The filter cylinder is arranged outside the test rod, the filter cylinder can realize microfiltration, sewage can pass through the filter cylinder to realize normal monitoring of the liquid level, and small impurities can be intercepted to avoid the impurities adhering to the surface of the test rod, and the monitoring accuracy is improved. 2. In the scraping type cleaning assembly, a plurality of annularly distributed positioning plate pieces are arranged outside the filter cylinder, the positioning plate pieces are provided with bristles, the bristles can directly contact the outer wall of the filter cylinder, and therefore part of the impurities on the surface of the filter cylinder can be cleaned during the rotation of the bristles, and the filter cylinder is preliminarily cleaned. 3. In the aeration type cleaning assembly, the gas supply part is also driven by the driving part, and shares the same driving structure, so that the production and use cost of the device can be reduced, and the gas generated by the aeration type cleaning assembly can be directly introduced into the filter cylinder to utilize the shear force and suction force generated when the airflow passes through the mesh hole to clean the impurities adhering to the outer wall of the filter cylinder. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 The structure schematic view of a preferred embodiment of the flexible digital liquid level sensor provided by the present application is shown in the figure. Figure 2 The structure schematic view of the filter cylinder cooperatively connected with the test rod shown in the present application is shown in the figure. Figure 3 The structure schematic view of the scraping type cleaning component shown in the present application is shown in the figure. Figure 1 ; Figure 4 The structure schematic view of the scraping type cleaning component shown in the present application is shown in the figure. Figure 2 ; Figure 5 The structure schematic view of the aeration type cleaning assembly shown in the present application is shown in the figure. Figure 1 ; Figure 6 The structure schematic view of the aeration type cleaning assembly shown in the present application is shown in the figure. Figure 2 .
[0019] Marked numbers in the figure: 1, display body; 11, test rod; 12, positioning disc; 13, base; 14, air outlet hole; Filter cylinder; Scraping cleaning assembly; 31, positioning foot; 32, motor; 33, transmission shaft; 34, driving gear; 35, driven gear ring; 36, positioning plate; 37, brush; 38, transmission pin; 4, aeration cleaning assembly; 41, ring seat; 42, telescopic air bag; 43, first one-way valve; 44, second one-way valve; 45, first air guide pipe; 46, second air guide pipe; 47, bearing seat; 48, air nozzle; 49, transmission cylinder; 410, track groove; 411, first positioning plate; 412, second positioning plate; 413, light pole. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.
[0021] The specific implementation of the present application is described in detail below in combination with specific examples.
[0022] Please refer to Figures 1 to 6 The flexible digital liquid level sensor provided by the embodiment of the present application includes a monitoring unit, a filter cartridge 2, a scraping cleaning assembly 3 and an aeration cleaning assembly 4.
[0023] For the monitoring component and the filter cartridge 2, Please refer to Figure 1 and Figure 2 The monitoring unit includes a display body 1, a test rod 11 is installed on the display body 1, a positioning disc 12 is fixed on the test rod 11 and close to the position of the display body 1, and a base 13 is fixed at the other end of the test rod 11, the base 13 has a cavity inside and is provided with an air outlet hole 14 at the gap between the test rod 11 and the filter cartridge 2. The pore size of the filter cartridge 2 is 0.1-10 μm, and the whole filter cartridge 2 is in the form of a boss, the diameter of the upper end is smaller than that of the lower end, and the two ends are respectively fixed on the positioning disc 12 and the base 13, and are coaxially arranged with the test rod 11, and have a gap therebetween.
[0024] It should be noted that: for the monitoring unit, the main body is a vertically installed test rod 11, the top end of the test rod 11 is connected with the display body 1 for real-time display and signal output, and a specially designed filter cartridge 2 is coaxially arranged outside the test rod 11, the filter cartridge 2 has a small pore size, can effectively block the suspended particles, fibers, grease and other pollutants in the liquid, and the whole filter cartridge 2 is in the form of a boss with a narrow upper end and a wide lower end, such a streamlined structure not only can increase the mechanical strength, but also can effectively guide the pollutants to slide along the inclined surface, reduce the adhesion and accumulation of the pollutants on the surface; The upper and lower ends of the filter cartridge 2 are fixed by the positioning disc 12 and the base 13, so as to form an annular cavity between the positioning disc 11 and the internal test rod 11, the sewage can normally enter the annular cavity, and the dirt is intercepted, so that the dirt is prevented from adhering to the surface of the test rod 11, and the normal detection of the liquid level by the device is ensured.
[0025] For the scraping cleaning assembly 3, the driving part and the cleaning part are composed; Please refer to Figure 3 and Figure 4 The driving part includes the positioning foot 31 fixed on the positioning disc 12, the motor 32 fixed on the positioning disc 12, the transmission shaft 33 fixed on the output end of the motor 32 through the shaft coupling, and the driving gear 34 fixed on the other end of the transmission shaft 33 and arranged concentrically. The filter cartridge 2 is also rotationally connected with the driven gear ring 35 arranged concentrically, and the driven gear ring 35 is in meshing transmission with the driving gear 34. Please refer to Figure 1 and Figure 3 The cleaning part is multiple and annularly distributed outside the filter cartridge 2, and includes the positioning plate 36 screwed on one end of the driven gear ring 35, and the brush 37 with multiple linearly distributed and obliquely arranged bristles on one side of the positioning plate 36 and in contact with the outer wall of the filter cartridge 2 to scrape the dirt adhered to the outside of the filter cartridge 2.
[0026] It should be noted that the scraping cleaning assembly 3 is composed of the driving part and the cleaning part; the basic support structure of the driving part is the positioning foot 31 fixed on the positioning disc 12, the motor 32 installed on the positioning foot 31 to provide power, the transmission shaft 33 driven to rotate by the motor 32 through the shaft coupling, the driving gear 34 fixed on the end of the transmission shaft 33, and the driven gear ring 35 rotationally connected outside the filter cartridge 2, which is in meshing transmission with the driving gear 34, so that the driven gear ring 35 can be directly driven to rotate when the motor 32 operates. The cleaning part is multiple and annularly distributed outside the filter cartridge 2 to improve the cleaning effect of the filter cartridge 2, and includes the positioning plate 36 screwed on the driven gear ring 35, and the brush 37 with multiple linearly distributed and obliquely arranged bristles on the inner side of each positioning plate 36 and in elastic contact with the outer wall of the filter cartridge 2 at a certain angle, which is driven to move synchronously when the driven gear ring 35 rotates, so as to continuously and comprehensively scrape and clean the outer wall of the filter cartridge 2, effectively remove the filter cake, oil stains and fiber blockage on the surface, and thus ensure the long-term permeability and accuracy of monitoring of the filter cartridge 2.
[0027] For the aeration cleaning assembly 4, the transmission part and the air supply part are composed; Please refer to Figure 5 and Figure 6The transmission part comprises a transmission cylinder 49, which is sleeved outside the transmission shaft 33 and can move axially relative to the transmission shaft 33, has a wavy track groove 410 on the circumferential inner wall of the transmission cylinder 49, and has a transmission pin 38 welded on the circumferential outer wall of the transmission shaft 33, which slides in the track groove 410; One end of the transmission cylinder 49 is integrally connected with a first positioning plate 411, a second positioning plate 412 is welded and fixed on the positioning foot stand 31, and a light rod 413 is fixed between the positioning foot stand 31 and the second positioning plate 412, and the light rod 413 penetrates through the first positioning plate 411 and is slidably connected therewith; Please refer to Figure 1 and Figure 3 The gas supply part comprises two concentric ring seats 41, a telescopic air bag 42 is fixed between the two ring seats 41, so that a closed cavity is formed inside the ring seat 41 and the telescopic air bag 42, the two ring seats 41 are respectively provided with an air inlet and an air outlet, and are respectively provided with a first one-way valve 43 and a second one-way valve 44, and the second one-way valve 44 is provided with a first air guide pipe 45; A second air guide pipe 46 is also fixed on the base 13, one end of the second air guide pipe 46 is closed, and the other end has an opening, the opening end communicates with the internal cavity of the base 13, and the circumferential outer wall of the second air guide pipe 46 is provided with an air nozzle 48 near the closed end, and the air nozzle 48 is connected with the first air guide pipe 45; The closed end of the second air guide pipe 46 is fixed with a bearing seat 47, which is connected with the transmission shaft 33.
[0028] It should be noted that the transmission part and the gas supply part together constitute a clever mechanical pneumatic system, that is, the core of the transmission part is a transmission cylinder 49 sleeved outside the transmission shaft 33, which can move axially, the inner wall of the transmission cylinder 49 is processed with a wavy track groove 410, which cooperates with the transmission pin 38 welded on the transmission shaft 33 to convert the rotary motion of the transmission shaft 33 into the regular reciprocating axial motion of the transmission cylinder 49; One end of the transmission cylinder 49 is provided with a first positioning plate 411, and the positioning foot stand 31 is provided with a light rod 413, which penetrates through the first positioning plate 411 and is slidably connected therewith, to form a precise moving pair, which can position the axial movement of the transmission cylinder 49 and make the movement process more stable; The gas supply part is composed of two concentric ring seats 41 and a telescopic air bag 42 fixed therebetween to form a closed air cavity, the upper ring seat 41 is fixed with the transmission cylinder 49, so that the telescopic air bag 42 can be pulled and pressed when the transmission cylinder 49 moves axially, and the two ring seats 41 are respectively provided with an air inlet provided with a first one-way valve 43 and an air outlet provided with a second one-way valve 44, so that the air inlet can continuously intake air and the air outlet can continuously exhaust air during the expansion and contraction of the telescopic air bag 42. The gas outlet is connected to the second air duct 46 fixed on the base 13 through the first air duct 45, i.e. the open end of the second air duct 46 communicates with the internal cavity of the base 13, and the tube wall of the second air duct 46 is provided with an air nozzle 48 connected with the first air duct 45 near the closed end, so that the gas can be introduced into the internal cavity of the base 13 and discharged from the gas outlet hole 14 to achieve further cleaning of the filter cartridge 2 through the bubbles; The closed end of the second air duct 46 is connected with the transmission shaft 33 through the bearing seat 47, which can further position the second air duct 46 and has higher stability; Specifically, when the transmission cylinder 49 drives the first positioning plate 411 to reciprocate, the stretchable air bag 42 is periodically compressed and released, like an air pump, and the external gas is pressed into the cavity of the base 13 through the first air duct 45, the air nozzle 48 and the second air duct 46 under the control of the two one-way valves, and finally sprayed from the gas outlet hole 14, to achieve the back flushing cleaning of the internal gap of the filter cartridge 2.
[0029] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.
Claims
1. A flexible digital liquid level sensor comprising a display body (1) on which a test rod (11) is mounted, characterized in that, Also include: Filter cartridge (2), the filter cartridge (2) is fixed on the test rod (11), which is concentrically arranged with the test rod (11), and has a gap between the two; Scraping cleaning assembly (3), the scraping cleaning assembly (3) is installed on the test rod (11), which is composed of driving part and cleaning part, the cleaning part contacts the outer wall of the filter cartridge (2) and can rotate along the circumferential direction thereof; Aeration cleaning assembly (4), the aeration cleaning assembly (4) is installed on the test rod (11), which is composed of transmission part and gas supply part, and the transmission part is in transmission connection with the driving part in the scraping cleaning assembly (3), and the gas generated by the gas supply part is injected into the filter cartridge (2).
2. The flexible digital liquid level sensor of claim 1, wherein, The test rod (11) is fixed with a positioning disc (12) near the display body (1), and the other end of the test rod (11) is fixed with a base (13), the base (13) has a cavity inside, and an air outlet hole (14) is arranged at the gap between the test rod (11) and the filter cartridge (2).
3. The flexible digital liquid level sensor of claim 1, wherein, The aperture of the filter cartridge (2) is 0.1-10μm, and the whole is in the form of a boss, the upper end diameter is smaller than the lower end diameter, and the two ends are fixed on the positioning disc (12) and the base (13) respectively.
4. The flexible digital liquid level sensor of claim 1, wherein, The driving part includes a positioning foot stand (31), the positioning foot stand (31) is fixed on the positioning disc (12), a motor (32) is fixed on the positioning disc (12), the output end of the motor (32) is fixed with a transmission shaft (33) through a shaft coupling, and the other end of the transmission shaft (33) is fixed with a driving gear (34) arranged concentrically. A driven gear ring (35) arranged concentrically is also rotatably connected to the filter cartridge (2), and the driven gear ring (35) is in meshing transmission with the driving gear (34).
5. The flexible digital liquid level sensor of claim 1, wherein, The cleaning part is a plurality of, annularly distributed on the outside of the filter cartridge (2), including a positioning plate (36), the positioning plate (36) is screw-fixed on one end of the driven gear ring (35), one side of the positioning plate (36) has a plurality of straight line distributed, inclinedly arranged bristles (37), the bristles (37) contact with the outer wall of the filter cartridge (2) to scrape off the dirt attached to the outside of the filter cartridge (2).
6. The flexible digital liquid level sensor of claim 1, wherein, The transmission part includes a transmission cylinder (49), the transmission cylinder (49) is sleeved on the outside of the transmission shaft (33) and can move axially relative to the transmission shaft (33), the transmission cylinder (49) has a wave-shaped track groove (410) on the circumferential inner wall, and a transmission pin (38) is welded on the circumferential outer wall of the transmission shaft (33), the transmission pin (38) slides in the track groove (410).
7. The flexible digital liquid level sensor of claim 6, wherein, One end of the transmission cylinder (49) is also integrally connected with a first positioning plate (411), and a second positioning plate (412) is welded and fixed on the positioning foot stand (31), and a light rod (413) is fixed between the positioning foot stand (31) and the second positioning plate (412), the light rod (413) penetrates through the first positioning plate (411) and is in sliding connection with the first positioning plate (411).
8. The flexible digital liquid level sensor of claim 1, wherein, The air supply part includes two concentric ring seats (41), an elastic air bag (42) is fixed between the two ring seats (41), so that a closed cavity is formed inside the ring seat (41) and the elastic air bag (42), the two ring seats (41) are respectively provided with air inlets and air outlets, and a first one-way valve (43) and a second one-way valve (44) are respectively installed, the second one-way valve (44) is provided with a first air guide pipe (45); A second air guide pipe (46) is also fixed on the base (13), one end of the second air guide pipe (46) is closed, and the other end is provided with an opening, the opening end communicates with the internal cavity of the base (13), and the circumferential outer wall of the second air guide pipe (46) is provided with an air nozzle (48) close to the closed end, and the air nozzle (48) is connected with the first air guide pipe (45).
9. The flexible digital liquid level sensor of claim 8, wherein, A bearing seat (47) is fixed on the closed end of the second air guide pipe (46), and the bearing seat (47) is connected with the transmission shaft (33).