Pipeline liquid level detection sensor

Abstract

The utility model relates to the technical field of liquid level sensors, in particular to a pipeline liquid level detection sensor which comprises a shell, a capacitor plate and a PCB (printed circuit board), the capacitor plate and the PCB are arranged in the shell, a plurality of round notches protruding downwards are integrally formed in the bottom of the shell, and nonmetal pipelines are fixedly mounted in the round notches through fixing structures. By installing the sensor outside a non-metal pipeline, the sensor can be firmly installed on the non-metal pipeline through a ribbon, and the capacitance value in a small pipe can be accurately measured, so that the liquid level height in the pipe can be judged by measuring the capacitance value of the non-metal pipeline, and the height change of conductive liquid in the non-metal pipeline can be accurately detected; the function of detecting the liquid level height of the small pipeline is achieved in a capacitance detection mode, installation is easy, and the application range is wider.

Description

Technical Field

[0001] This utility model relates to the field of liquid level sensor technology, and in particular to a pipeline liquid level detection sensor. Background Technology

[0002] Small-tube level sensors are widely used in various devices requiring liquid level detection, such as floor scrubbers, water dispensers, coffee machines, and robotic vacuum cleaners. They detect liquid level changes in real time, promptly reminding users to replenish the liquid, thus improving user experience and equipment performance. Small-tube level sensors typically employ optical principles, using a light source and detector to monitor the liquid level within the tube. Because optical sensors require light to pass through the pipe to observe the liquid's state, the pipe must be transparent with a significant difference in light transmittance between itself and the liquid inside. Opaque pipes require a detection port, which greatly limits their application range. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies, such as the need for transparent pipes with large differences in light transmittance between the pipe and the liquid inside, and the requirement to open a detection port for opaque pipes, which limits the scope of application. Therefore, this invention proposes a pipeline liquid level detection sensor.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] Design a pipeline liquid level detection sensor, including a housing and an internal capacitor plate and PCB board. The bottom of the housing is integrally formed with several downward-protruding circular slots, and a non-metallic pipe is fixedly installed in the circular slots by a fixing structure. The bottom of the housing is integrally formed with limiting blocks located on four sides. The capacitor plate is placed at the bottom of the housing and clamped between the limiting blocks. The upper end of the capacitor plate is fixedly mounted with the PCB board by an mounting structure. A power indicator light, a status indicator light, and a switch are fixedly mounted on the top of the PCB board. Through holes are opened on the outer wall of the housing for installing the power indicator light, status indicator light, and switch, respectively. A top cover is fixedly mounted on the top of the housing by an assembly structure. A circular hole is opened on the outer wall of the housing, and a wire is installed in the circular hole. The wire is located at one end of the housing and connects to the PCB board and the capacitor plate.

[0006] Preferably, the fixing structure includes cable tie rings and cable ties. The bottom of the non-metallic pipe is abutted by a plurality of cable ties perpendicular to the non-metallic pipe, and cable tie rings are sleeved at both ends of the cable ties. The cable tie rings located at both ends of the cable ties are fixedly connected to the left and right end faces of the housing, respectively.

[0007] Preferably, the mounting structure includes a bracket and a placement groove. The bracket is fixed inside the housing by a limiting structure, and the upper end face of the bracket is provided with a placement groove. The PCB board is fixedly mounted inside the placement groove by a snap-fit ​​structure.

[0008] Preferably, the limiting structure includes a limiting block and a snap-fit ​​block. The top of the limiting block abuts against the bracket. Several snap-fit ​​blocks are integrally formed on the inner wall of the housing, and the bottom of the snap-fit ​​blocks abuts against the bracket. The upper end of the snap-fit ​​block is provided with a slope away from the housing.

[0009] Preferably, the snap-fit ​​structure includes trapezoidal snap-fit ​​blocks, the top of the bracket is integrally formed with a plurality of elastic connecting plates, and the upper end of the connecting plates is integrally formed with trapezoidal snap-fit ​​blocks, the lower ends of the plurality of trapezoidal snap-fit ​​blocks abut against the PCB board, and the upper end of the plurality of trapezoidal snap-fit ​​blocks has a chamfer on the side near the PCB board.

[0010] Preferably, the assembly structure includes a snap ring, a snap groove, and snap blocks. A plurality of snap blocks are integrally formed on the upper inner wall of the housing, and the upper end of the snap blocks is provided with a slope away from the housing. The bottom of the top cover is integrally formed with a snap ring, and the outer wall of the snap ring is slidably connected to the housing. The outer wall of the snap ring is provided with a snap groove, and the snap blocks are snapped into the snap groove.

[0011] Preferably, the bottom of several segments on the outer side of the snap ring with snap grooves is integrally formed with downward protrusions.

[0012] The present invention proposes a pipeline liquid level detection sensor, which has the following advantages: by installing the sensor on the outside of a non-metallic pipe, the sensor can be firmly installed on the non-metallic pipe with cable ties, and the capacitance value inside the small pipe can be accurately measured. Thus, the liquid level height inside the pipe can be determined by measuring the capacitance value of the non-metallic pipe. It can accurately detect changes in the height of conductive liquid inside the non-metallic pipe. The function of detecting the liquid level height in a small pipe is achieved by using capacitance detection, while the installation is simple and the application range is wider. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a pipeline liquid level detection sensor proposed in this utility model;

[0014] Figure 2 This is a cross-sectional structural diagram of a pipeline liquid level detection sensor proposed in this utility model;

[0015] Figure 3 This is an exploded view of a pipeline liquid level detection sensor proposed in this utility model;

[0016] Figure 4 This is an enlarged view of area B of a pipeline liquid level detection sensor proposed in this utility model;

[0017] Figure 5 This is an enlarged view of area A of a pipeline liquid level detection sensor proposed in this utility model.

[0018] In the diagram: 1. Non-metallic pipe; 2. Cable tie; 3. Circular groove; 4. Housing; 5. Power indicator light; 6. Status indicator light; 7. Top cover; 8. Switch; 9. Cable tie ring; 10. Wire; 11. Clip block; 12. Clip ring; 13. Capacitor board; 14. Bracket; 15. PCB board; 16. Limiting block; 17. Placement slot; 18. Trapezoidal clip; 19. Slot. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Reference Figure 1-5 A pipeline liquid level detection sensor includes a housing 4 and a capacitor plate 13 and a PCB board 15 inside it. The bottom of the housing 4 is integrally formed with several downwardly protruding circular slots 3, and a non-metallic pipe 1 is fixedly installed in the circular slots 3 by a fixing structure. The bottom of the housing 4 is integrally formed with limiting blocks 16 located on the four sides. The capacitor plate 13 is placed at the bottom of the housing 4 and clamped between the limiting blocks 16. The upper end of the capacitor plate 13 is fixedly mounted with the PCB board 15 by an installation structure. The top of the PCB board 15 is fixedly mounted with a power indicator light 5, a status indicator light 6, and a switch 8. The outer wall of the housing 4 has through holes for installing the power indicator light 5, the status indicator light 6, and the switch 8 respectively. The top of the housing 4 is fixedly mounted with a top cover 7 by an assembly structure. The outer wall of the housing 4 has a circular hole, and a wire 10 is installed in the circular hole. One end of the wire 10 is located in the housing 4 and is connected to the PCB board 15 and the capacitor plate 13.

[0021] Reference Figure 1-5 In order to conveniently fix the non-metallic pipe 1 in the circular groove 3, the fixing structure includes cable tie rings 9 and cable ties 2. The bottom of the non-metallic pipe 1 is abutted by several cable ties 2 perpendicular to the non-metallic pipe 1, and cable tie rings 9 are sleeved on both ends of the cable ties 2. The cable tie rings 9 located at both ends of the cable ties 2 are fixedly connected to the left and right end faces of the housing 4 respectively.

[0022] Reference Figure 1-5 The installation structure includes a bracket 14 and a placement groove 17. The bracket 14 is fixed inside the housing 4 by a limiting structure, and the upper end face of the bracket 14 is provided with a placement groove 17. The PCB board 15 is fixedly installed inside the placement groove 17 by a snap-fit ​​structure.

[0023] Reference Figure 1-5To facilitate the installation and fixation of the bracket 14, the limiting structure includes a limiting block 16 and a snap-fit ​​block 11. The top of the limiting block 16 abuts against the bracket 14. Several snap-fit ​​blocks 11 are integrally formed on the inner wall of the housing 4, and the bottom of the snap-fit ​​blocks 11 abuts against the bracket 14. The upper end of the snap-fit ​​blocks 11 is provided with a slope away from the housing 4.

[0024] Reference Figure 1-5 To facilitate fixing the PCB board 15 in the placement slot 17, the snap-fit ​​structure includes trapezoidal snap-fit ​​blocks 18. The top of the bracket 14 is integrally formed with several elastic connecting plates, and the upper end of the connecting plates is integrally formed with trapezoidal snap-fit ​​blocks 18. The lower ends of the trapezoidal snap-fit ​​blocks 18 abut against the PCB board 15, and the upper end of the trapezoidal snap-fit ​​blocks 18 has a chamfer on the side near the PCB board 15.

[0025] Reference Figure 1-5 To increase the sealing performance and ease of installation of the top cover 7, the assembly structure includes a snap ring 12, a snap groove 19, and snap blocks 11. Several snap blocks 11 are integrally formed on the upper inner wall of the housing 4, and the upper end of the snap blocks 11 is provided with a slope away from the housing 4. The bottom of the top cover 7 is integrally formed with a snap ring 12, and the outer wall of the snap ring 12 is slidably connected to the housing 4. The outer wall of the snap ring 12 is provided with a snap groove 19, and the snap blocks 11 are snapped into the snap groove 19.

[0026] Reference Figure 1-5 In order to reduce the height of the snap ring 12, the bottom of several sections of the snap ring 12 with the snap groove 19 on the outer side are integrally formed with downward protrusions.

[0027] Working principle: After the non-metallic pipe 1 is inserted into the circular groove 3, it is secured with cable ties 2, thus assembling the sensor onto the non-metallic pipe 1 to be tested; after connecting the power supply through the wire 10 and flowing a weakly conductive liquid into the non-metallic pipe 1, the capacitance will change accordingly as the height of the conductive liquid in the non-metallic pipe 1 changes. The change in the liquid level in the pipe is inferred by comparing the change in the capacitance value; after the capacitance value of the liquid in the non-metallic pipe 1 is pre-calibrated, when the liquid level in the non-metallic pipe 1 changes, the capacitor plate 13 detects the change in the capacitance value of the non-metallic pipe 1. When the set alarm value is reached, the sensor will issue an alarm signal; after connecting the power supply, confirm that the power indicator 5 is lit, adjust the liquid level in the non-metallic pipe 1 to the alarm position, press the switch 8 lightly, the status indicator 6 flashes three times and then goes out, indicating that the alarm line position calibration is complete, replenish the liquid in the pipe, the sensor starts monitoring, when the liquid level in the pipe drops to the alarm line, the status indicator 6 flashes continuously and the wire 10 outputs an alarm signal.

[0028] By installing the sensor on the outside of the non-metallic pipe 1, the sensor can be securely installed on the non-metallic pipe 1 using cable ties 2. It can accurately measure the capacitance value inside the small pipe, thereby determining the liquid level height inside the pipe by measuring the capacitance value of the non-metallic pipe 1. It can accurately detect changes in the height of conductive liquid inside the non-metallic pipe. The function of detecting the liquid level height in a small pipe is achieved by using capacitance detection, while also being simple to install and having a wider range of applications.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pipeline liquid level detection sensor, comprising a housing (4) and an internal capacitor plate (13) and a PCB board (15), characterized in that, The bottom of the housing (4) is integrally formed with several downward protruding circular slots (3), and a non-metallic pipe (1) is fixedly installed in the circular slots (3) by a fixing structure. The bottom of the housing (4) is integrally formed with limiting blocks (16) located on the four sides. A capacitor plate (13) is placed at the bottom of the housing (4) and clamped between several limiting blocks (16). A PCB board (15) is fixedly installed at the upper end of the capacitor plate (13) by an installation structure. A power indicator light (5), a status indicator light (6), and a switch (8) are fixedly installed on the top of the PCB board (15). Through holes are opened on the outer wall of the housing (4) for installing the power indicator light (5), the status indicator light (6), and the switch (8). A top cover (7) is fixedly installed on the top of the housing (4) by an assembly structure. A circular hole is opened on the outer wall of the housing (4), and a wire (10) is installed in the circular hole. One end of the wire (10) is located on the housing (4) and the wire is connected to the PCB board (15) and the capacitor plate (13).

2. The pipeline liquid level detection sensor according to claim 1, characterized in that, The fixing structure includes cable tie rings (9) and cable ties (2). The bottom of the non-metallic pipe (1) is abutted by several cable ties (2) perpendicular to the non-metallic pipe (1), and cable tie rings (9) are sleeved on both ends of the cable ties (2). The left and right end faces of the housing (4) are respectively fixedly connected to the cable tie rings (9) located at both ends of the cable ties (2).

3. The pipeline liquid level detection sensor according to claim 1, characterized in that, The mounting structure includes a bracket (14) and a placement groove (17). The bracket (14) is fixed inside the housing (4) by a limiting structure, and the upper end face of the bracket (14) is provided with a placement groove (17). The PCB board (15) is fixedly installed inside the placement groove (17) by a snap-fit ​​structure.

4. A pipeline liquid level detection sensor according to claim 3, characterized in that, The limiting structure includes a limiting block (16) and a snap-fit ​​block (11). The top of the limiting block (16) abuts against the bracket (14). Several snap-fit ​​blocks (11) are integrally formed on the inner wall of the housing (4), and the bottom of the snap-fit ​​block (11) abuts against the bracket (14). The upper end of the snap-fit ​​block (11) is provided with a slope away from the housing (4).

5. A pipeline liquid level detection sensor according to claim 3, characterized in that, The snap-fit ​​structure includes trapezoidal snap-fit ​​blocks (18). The top of the bracket (14) is integrally formed with several elastic connecting plates, and the upper end of the connecting plates is integrally formed with trapezoidal snap-fit ​​blocks (18). The lower ends of the trapezoidal snap-fit ​​blocks (18) abut against the PCB board (15), and the upper end of the trapezoidal snap-fit ​​blocks (18) is chamfered on the side near the PCB board (15).

6. A pipeline liquid level detection sensor according to claim 1, characterized in that, The assembly structure includes a snap ring (12), a snap groove (19), and a snap block (11). Several snap blocks (11) are integrally formed on the upper inner wall of the housing (4), and the upper end of the snap block (11) is provided with a slope away from the housing (4). The bottom of the cover (7) is integrally formed with a snap ring (12), and the outer wall of the snap ring (12) is slidably connected to the housing (4). The outer wall of the snap ring (12) is provided with a snap groove (19), and the snap block (11) is snapped in the snap groove (19).

7. A pipeline liquid level detection sensor according to claim 6, characterized in that, The bottom of several sections of the snap ring (12) with snap grooves (19) on the outside is integrally formed with downward protrusions.

Images