Pipeline type photoelectric liquid level sensor

Abstract

The utility model discloses a pipeline type photoelectric liquid level sensor, which relates to the technical field of photoelectric liquid level sensors and comprises a main pipe, screwed joints are fixedly mounted on two sides of the main pipe, and a filter component is arranged in the screwed joint at the input end of the main pipe. By adopting the above structure, when the device is in use, the circuit board can be inserted into the shell of the shell, the light emitter and the light receiver are protruded and then inserted into the shell, so that the circuit board and the light emitter and the light receiver are moved to the prism mechanism to detect and install the shell, the annular digging groove is dug to pull the adjusting frame to move outwards, and the arc-shaped limiting frame is separated from the arc-shaped clamping sleeve through linkage; during maintenance, an annular digging groove is dug to pull the adjusting frame, linkage is conducted to enable the arc-shaped limiting frame and the arc-shaped clamping sleeve to be separated, the cover plate is disassembled, the circuit board and other components are disassembled, traditional limitation is broken through, maintenance convenience is improved, maintenance cost is reduced, and normal operation of equipment is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of photoelectric liquid level sensor technology, and specifically relates to a pipeline-type photoelectric liquid level sensor. Background Technology

[0002] In modern industry, daily life, and medical fields, accurate liquid level monitoring is crucial. Photoelectric liquid level sensors, with their precise detection capabilities based on optical principles, have become an indispensable part of many systems. Utilizing the differences in the refraction and reflection properties of light in air and liquid, a light source, a light receiver, and a detection circuit work together to achieve non-contact, accurate liquid level detection. When the liquid level is below the detection position, most of the light is received by the light receiver, and the circuit outputs a specific signal. As the liquid level rises and contacts the sensor, the light propagation changes, and the amount of light received by the light receiver changes. The detection circuit then determines the liquid level status and outputs a corresponding electrical signal. Widely used in scenarios such as water tank and oil tank level monitoring, these sensors effectively ensure the normal operation of equipment and system safety.

[0003] With technological advancements and active innovation from researchers, such as the pipeline-type photoelectric liquid level sensor disclosed in Chinese patent "CN218035252U," this sensor utilizes a coordinated operation of the outer shell, PCBA board, and pipeline structure. It employs a light-transmitting material to integrally mold the pipeline and outer shell structures, and incorporates a prism structure to assist light propagation. It boasts advantages such as simple manufacturing process, low cost, no need for waterproofing, and direct liquid flow ensuring detection accuracy. However, existing technologies still have significant shortcomings in practical applications. The electronic components are installed within the inner cavity of the outer shell, making them susceptible to damage from aging and abnormal circuit voltage over long-term use. Furthermore, the integrated installation makes subsequent disassembly and maintenance extremely cumbersome. Even with bolts and screws, long-term use leads to rust and dust blockage, making disassembly difficult and even causing stripping. Special screwdrivers and other tools are required, severely impacting maintenance efficiency and convenience. Therefore, there is an urgent need for innovative design improvements to existing photoelectric liquid level sensors to overcome these shortcomings and better meet the needs of various fields for accurate liquid level monitoring and convenient equipment maintenance. Utility Model Content

[0004] In view of the problems mentioned in the background art, the purpose of this utility model is to provide a pipeline-type photoelectric liquid level sensor to solve the problem that the existing technology is not easy to disassemble and maintain during use.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A pipeline-type photoelectric liquid level sensor includes a main pipe with threaded joints fixedly installed on both sides. A filter assembly is provided inside the threaded joint at the input end of the main pipe. A prism mechanism is fixedly installed on one side of the main pipe. A housing is fixedly installed on the outer side of the main pipe near the prism mechanism. A circuit board is inserted inside the housing. A light emitter is fixedly connected to one end of the circuit board near the prism mechanism, and a light receiver is fixedly connected to the other end of the circuit board near the prism mechanism. A cover plate is fixedly connected to the side of the circuit board away from the housing. A mounting mechanism is provided on the outer side of the cover plate, and the cover plate is snapped into the housing through the mounting mechanism. Wiring holes are linearly arranged at equal intervals at the lower end of the cover plate, and wires are inserted inside the wiring holes. The wires are electrically connected to the circuit board.

[0007] As a preferred technical solution, the filter assembly includes an internal thread, which is formed inside the threaded interface at the input end of the main pipe. The threaded interface at the input end of the main pipe is connected to an inner tube via the internal thread, and a filter screen is fixedly installed inside the inner tube.

[0008] As a preferred technical solution, an adjusting torsion ring is fixedly installed on the outer side of the filter screen, and the outer surface of the adjusting torsion ring is provided with anti-slip arc grooves arranged in a ring at equal intervals.

[0009] As a preferred technical solution, the prism mechanism includes a main frame, which is fixedly installed inside the main tube on the side near the outer shell. A first prism mirror is fixedly connected to the middle of the main frame, and second prism mirrors are fixedly installed at the top and bottom of the main frame. The light beam emitted by the light emitter passes through the first and second prism mirrors and is received by the light receiver.

[0010] As a preferred technical solution, the installation mechanism includes a fixed column and a rail frame. The fixed column is fixedly connected to the top rear ends and bottom rear ends of the main frame. An arc-shaped sleeve is fixedly installed on the outer side of the fixed column. The rail frame is fixedly installed on the upper back of the cover plate. An elastic component is fixedly installed at both ends of the rail frame. An adjustment component is provided on the top of the elastic component. A snap-fit ​​component is fixedly installed at the outer end of the rail frame. The end of the snap-fit ​​component is inserted into the inside of the arc-shaped sleeve.

[0011] As a preferred technical solution, the elastic component includes a telescopic spring, which is fixedly installed at both ends inside the rail frame. A slider is fixedly installed at the outer end of the telescopic spring, and a frame is fixedly installed on the outer side of the slider. The top of the slider is linked with the adjustment component, and the outer end of the frame passes through the rail frame and is connected to the snap-fit ​​component.

[0012] As a preferred technical solution, the snap-fit ​​assembly includes a rack and a fixing frame. The rack is fixedly installed inside the frame, and the fixing frame is fixedly installed on the outer end of the rail frame. A gear is rotatably connected inside the fixing frame. The gear and the rack mesh with each other. Limiting components are fixedly installed at the top and bottom of the gear, and the limiting components are inserted into the inside of the arc-shaped sleeve.

[0013] As a preferred technical solution, the limiting component includes a connecting shaft, which is fixedly installed on the top and bottom of the gear. The connecting shaft and the fixing frame are rotatably connected. A connecting plate is fixedly installed on the outer end of the connecting shaft. An arc-shaped limiting frame is fixedly installed on the side of the connecting plate near the main tube. The end of the arc-shaped limiting frame is inserted into the interior of the arc-shaped limiting sleeve. The arc-shaped limiting frame, the arc-shaped limiting sleeve, and the connecting shaft are arranged in concentric circles.

[0014] As a preferred technical solution, the adjustment component includes a rotating shaft, which is rotatably connected to the top of the slider. A linkage plate is fixedly installed at the upper end of the rotating shaft, and an adjustment frame is hinged to the inner side of the linkage plate. An annular groove is provided in the middle of the inner side of the adjustment frame.

[0015] As a preferred technical solution, the filter screen is generally conical in shape, and a sealing gasket is provided on the outside of the threaded joint.

[0016] In summary, the present invention has the following main advantages:

[0017] Firstly, this device, by incorporating a filter assembly, allows for the connection of the main pipe and the outlet pipe via a threaded joint during actual use. As water flows into the main pipe, the filter assembly immediately activates. Its large, cone-shaped filter screen guides impurities towards the center, preventing the screen from being uniformly covered or completely blocked. This excellent filtration function effectively prevents dust and impurities from entering the main pipe and adhering to the prism mechanism, ensuring the long-term stable operation and accurate detection of the photoelectric level sensor. During detection, the light reflection differs between waterless and water-containing states, and the light receiver outputs high and low voltage signals based on this to determine the liquid level. Simultaneously, the filter assembly prevents impurities from affecting the light transmission of the prism. Combined with the detachable design of the installation mechanism, it provides convenience for subsequent maintenance.

[0018] Secondly, this device, through the installation mechanism, allows the circuit board to be inserted into the outer shell first, so that the light emitter and light receiver protrude from the outside of the shell, and then the shell is inserted into the outer shell. After it is in place, the light emitter and receiver are moved to the prism mechanism for testing. During the shell installation stage, the adjusting frame can be pulled outward by pressing the annular groove. The adjusting frame moves the slider through the linkage plate and rotating shaft, compressing the telescopic spring. The frame then moves inward automatically, driving the rack and pinion drive gear to rotate, causing the arc-shaped limit frame to separate from the arc-shaped sleeve. After the circuit board is installed, the adjusting frame is released, the spring returns to its original position, and the arc-shaped limit frame is inserted into the arc-shaped sleeve, securely installing the cover plate and fixing the internal components.

[0019] Third, by setting up an installation mechanism, the device can be easily inspected and maintained. When the circuit board needs to be inspected, simply pry open the annular slot again, pull out the adjustment bracket, and move the slider inward through the linkage plate. By using the linkage of gears and racks, the arc-shaped limit bracket and the arc-shaped sleeve can be separated, and the cover plate on the back of the shell can be easily removed. The circuit board, light emitter and light receiver can be quickly separated. This design breaks through the limitations of the traditional photoelectric liquid level sensor's inconvenient inspection and maintenance, greatly improves the convenience of overall inspection and maintenance, reduces maintenance time and cost, and ensures that the equipment can be restored to normal operation in a timely manner. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the filter component of this utility model in its disassembled state.

[0022] Figure 3 This is a schematic diagram of the prism mechanism structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the shell and housing of this utility model in a disassembled state;

[0024] Figure 5 This is a schematic diagram of the installation mechanism and the shell in a disassembled state of this utility model;

[0025] Figure 6 This is a schematic diagram of the installation mechanism of this utility model in its overall separated state from the rest of the structure.

[0026] Figure 7 This is a front view schematic diagram of the installation mechanism of this utility model in its overall separated state;

[0027] Figure 8 This is a utility model Figure 5 A magnified structural diagram at point A.

[0028] Reference numerals: 1. Main pipe; 2. Threaded connector; 3. Filter assembly; 31. Internal thread; 32. Inner tube; 33. Filter screen; 34. Adjusting torsion ring; 35. Anti-slip arc groove; 4. Outer shell; 5. Housing; 6. Mounting mechanism; 61. Fixing column; 62. Rail frame; 63. Arc-shaped ferrule; 64. Elastic component; 641. Telescopic spring; 642. Slider; 643. Frame; 65. Adjusting component; 651. Rotating shaft; 652. Linkage plate; 653. Adjustment bracket; 654, annular groove; 66, snap-fit ​​assembly; 661, rack; 662, fixing bracket; 663, gear; 664, limiting component; 6641, connecting shaft; 6642, connecting plate; 6643, arc-shaped limiting bracket; 7, circuit board; 8, light emitter; 9, light receiver; 10, cover plate; 11, prism mechanism; 111, main frame; 112, first prism mirror surface; 113, second prism mirror surface; 12, wiring hole; 13, wire. Detailed Implementation Example

[0029] refer to Figures 1 to 8This embodiment of a pipeline-type photoelectric liquid level sensor includes a main pipe 1, with threaded connectors 2 fixedly installed on both sides of the main pipe 1. A filter assembly 3 is provided inside the threaded connector 2 located at the input end of the main pipe 1. A prism mechanism 11 is fixedly installed on one side of the main pipe 1. A housing 4 is fixedly installed on the outer side of the main pipe 1 near the prism mechanism 11. A housing 5 is inserted inside the housing 4, and a circuit board 7 is inserted inside the housing 5. A light emitter 8 is fixedly connected to one end of the circuit board 7 near the prism mechanism 11, and a light receiver 9 is fixedly connected to the other end of the circuit board 7 near the prism mechanism 11. A cover plate 10 is fixedly connected to the side of the circuit board 7 away from the housing 5. A mounting mechanism 6 is provided on the outer side of the cover plate 10, and the cover plate 10 is snapped into the housing 4 through the mounting mechanism 6. Wiring holes 12 are linearly arranged at equal intervals at the lower end of the cover plate 10, and wires 13 are inserted inside the wiring holes 12. The wires 13 are electrically connected to the circuit board 7. When this pipeline-type photoelectric liquid level sensor is working, water flows from the input end of the main pipe 1 through the threaded connector 2... The water flows in through connector 2. The filter assembly 3 uses its special structure, such as a large-area cone-shaped filter screen 33, to filter impurities in the water, preventing impurities from entering the main pipe 1 and adhering to the prism mechanism 11, thus affecting detection. The light emitter 8 emits light. When no water flows through the main pipe 1, the prism mechanism 11 reflects most of the light to the light receiver 9. After receiving the signal, the light receiver 9 outputs the corresponding signal through the circuit board 7 via the wire 13. When liquid flows through the main pipe 1, the light propagation changes due to the liquid, and the light reflected by the prism mechanism 11 to the light receiver 9 decreases. The light receiver 9 receives a different signal, and the circuit board 7 outputs different signals to determine the liquid level. During installation, the circuit board 7 is inserted into the housing 5, and then the housing 5 is inserted into the outer shell 4. The mounting mechanism 6 on the outside of the cover plate 10, such as using the snap-fit ​​annular slot 654 to drive a series of mechanical structures, achieves the snap-fit ​​fixation between the cover plate 10 and the outer shell 4, ensuring stable operation of each component. The wire 13 is electrically connected to the circuit board 7 through the wiring hole 12 to ensure signal transmission.

[0030] refer to Figures 1-2The filter assembly 3 includes an internal thread 31, which is formed inside the threaded interface at the input end of the main pipe 1. The threaded interface at the input end of the main pipe 1 is threadedly connected to an inner tube 32 via the internal thread 31. A filter screen 33 is fixedly installed inside the inner tube 32. An adjusting torsion ring 34 is fixedly installed on the outer side of the filter screen 33. Anti-slip arc grooves 35 are evenly spaced and arranged in a ring on the outer surface of the adjusting torsion ring 34. The filter screen 33 is generally conical in shape. A sealing gasket is provided on the outer side of the threaded connector 2. During installation, the filter assembly 3 of this pipeline-type photoelectric liquid level sensor is installed by screwing the inner tube 32 with the filter screen 33 into the threaded interface at the input end of the main pipe 1 using the internal thread 31. To achieve fixation, the sealing gasket on the outside of the threaded joint 2 prevents water leakage. When water flows in from the inlet of the main pipe 1, it first passes through the filter screen 33. Because its overall shape is conical, its area is large, and its inclined surface can guide impurities to gather in the center, which can prevent dust and impurities from being evenly covered on the screen and causing blockage. If it is necessary to clean or replace the filter screen 33 during use, it can be operated by rotating the adjusting ring 34. The anti-slip arc groove 35 on the outer surface of the adjusting ring 34 makes it easy for the user to apply force and can easily unscrew the inner tube 32 from the main pipe 1. After cleaning or replacement, it can be screwed back in to ensure that the filter assembly 3 continues to effectively perform its filtering function and prevents impurities from entering the main pipe 1 and affecting the detection performance of the prism mechanism 11.

[0031] refer to Figure 3 The prism mechanism 11 includes a main frame 111, which is fixedly installed inside the main tube 1 near the outer shell 4. A first prism mirror 112 is fixedly connected to the middle of the main frame 111, and second prism mirrors 113 are fixedly installed at the top and bottom of the main frame 111. The light emitter 8 emits a light beam that passes through the first prism mirror 112 and the second prism mirror 113 and is received by the light receiver 9. When the device is running, the light emitter 8 emits a light beam, which first passes through the first prism mirror 112 in the middle of the main frame 111. The main frame 111 is fixedly installed inside the main tube 1 near the outer shell 4. To ensure stable beam propagation, if there is no water in the main pipe 1, the beam is refracted by the first prism mirror 112 and further reflected by the second prism mirrors 113 at the top and bottom of the main frame 111, and finally received by the light receiver 9. At this time, the light receiver 9 receives a strong light signal, and the circuit board 7 outputs a corresponding signal accordingly. However, when there is water in the main pipe 1, the water will change the propagation path and refraction and reflection of the beam, so that the light reaching the light receiver 9 after passing through the first prism mirror 112 and the second prism mirror 113 becomes weaker. The light receiver 9 receives a different signal, and the circuit board 7 outputs a different signal, thereby realizing the judgment of the liquid level.

[0032] refer to Figures 1-2 and Figures 4-8The installation mechanism 6 includes a fixed column 61 and a rail frame 62. The fixed column 61 is fixedly connected to the top rear ends and bottom rear ends of the main frame 111. An arc-shaped sleeve 63 is fixedly installed on the outer side of the fixed column 61. The rail frame 62 is fixedly installed on the upper back of the cover plate 10. Elastic components 64 are fixedly installed at both ends of the inner side of the rail frame 62. An adjustment component 65 is provided on the top of the elastic component 64. A snap-fit ​​component 66 is fixedly installed at the outer end of the rail frame 62. The end of the snap-fit ​​component 66 is inserted into the inner side of the arc-shaped sleeve 63. The elastic component 64 includes a telescopic spring 641. The telescopic spring 641 is fixedly installed at both ends of the inner side of the rail frame 62. A slider 642 is fixedly installed at the outer end of the telescopic spring 641. A frame 643 is fixedly installed on the outer side of the slider 642. The top of the slider 642 is linked with the adjustment component 65. The outer end of the frame 643 passes through the rail frame 62 and connects with the snap-fit ​​component 66. This pipeline-type photoelectric... The working principle of the liquid level sensor mounting mechanism 6 is as follows: During installation, when the cover plate 10 is brought close to the main frame 111, the arc-shaped sleeves 63 on the outer side of the fixing posts 61 at the top and bottom rear ends of the main frame 111 are ready to receive the snap-fit ​​assembly 66. The adjustment assembly 65 is activated, which in turn moves the slider 642, causing the slider 642 to compress the telescopic springs 641 at both ends inside the rail frame 62. At the same time, the frame 643 is moved, thereby driving the snap-fit ​​assembly 66 to disengage from the arc-shaped sleeve 63. When the cover plate 10 moves to the appropriate position, the adjustment assembly 65 is released, the telescopic springs 641 return to their original position and extend, pushing the slider 642 and the frame 643 outward, so that the snap-fit ​​assembly 66 is inserted into the arc-shaped sleeve 63, achieving a stable snap-fit ​​between the cover plate 10 and the main frame 111, thereby fixing the internal components such as the circuit board 7. This design not only facilitates the installation operation but also ensures the stability of each component during use, guaranteeing the normal operation of the sensor.

[0033] refer to Figures 4-8The snap-fit ​​assembly 66 includes a rack 661 and a fixing bracket 662. The rack 661 is fixedly installed inside the frame 643, and the fixing bracket 662 is fixedly installed on the outer end of the rail frame 62. A gear 663 is rotatably connected inside the fixing bracket 662, and the gear 663 meshes with the rack 661. Limiting elements 664 are fixedly installed at the top and bottom of the gear 663. The limiting elements 664 are inserted into the arc-shaped sleeve 63. The limiting element 664 includes a connecting shaft 6641, which is fixedly installed at the top and bottom of the gear 663. The connecting shaft 6641 is rotatably connected to the fixing bracket 662. A connecting plate 6642 is fixedly installed at the outer end. An arc-shaped limiting bracket 6643 is fixedly installed on the side of the connecting plate 6642 near the main pipe 1. The end of the arc-shaped limiting bracket 6643 is inserted into the inside of the arc-shaped limiting sleeve. The arc-shaped limiting bracket 6643, the arc-shaped limiting sleeve, and the connecting shaft 6641 are arranged in concentric circles. The adjusting component 65 includes a rotating shaft 651, which is rotatably connected to the top of the slider 642. A linkage plate 652 is fixedly installed at the upper end of the rotating shaft 651. An adjusting bracket 653 is hinged to the inner side of the linkage plate 652. An annular groove 654 is opened in the middle of the inner side of the adjusting bracket 653. This pipeline photoelectric liquid level sensor In the mounting mechanism 6 of the device, the snap-fit ​​component 66 and the adjusting component 65 work together. When it is necessary to install or remove the cover plate 10, by snapping the annular snap-fit ​​groove 654 in the middle of the inner side of the adjusting frame 653, the adjusting frame 653 drives the linkage plate 652 hinged to it to move. The linkage plate 652 rotates, causing the rotating shaft 651 fixed at its lower end to rotate on the top of the slider 642, thereby driving the slider 642 to slide in the rail frame 62, compressing the telescopic spring 641. The slider 642 moves and drives the frame 643. The frame 643 pushes the rack 661 to move. Since the rack 661 is rotatably connected to the gear 663 in the fixed frame 662, When meshed, the rack 661 moves to drive the gear 663 to rotate. When the gear 663 rotates, the connecting shaft 6641 fixed at its top and bottom rotates synchronously. The connecting shaft 6641 drives the connecting plate 6642 at the outer end to rotate, causing the arc-shaped limiting bracket 6643 on one side of the connecting plate 6642 to make a circular motion around the connecting shaft 6641 and separate from the arc-shaped sleeve 63. After installation, the adjusting bracket 653 is released, the telescopic spring 641 is reset, and the slider 642 is pushed in the opposite direction, so that the arc-shaped limiting bracket 6643 is reinserted into the arc-shaped sleeve 63, realizing a stable engagement of the cover plate 10 and ensuring the stable installation and normal operation of the internal components of the sensor.

[0034] Operating Principle and Advantages: This device effectively improves its stability and detection accuracy by incorporating a filter assembly 3. In practical applications, the main pipe 1 is connected to the outlet pipe via a threaded connector 2. When water flows into the main pipe 1 through the threaded connector 2, the filter assembly 3 plays a crucial role. The cone-shaped filter screen 33 has a large area and a conical structure. Its inclined surface effectively guides the filtered impurities to gather in the center of the filter screen 33, preventing dust and impurities from being evenly covered and thus preventing the filter screen 33 from being completely blocked. This design not only has excellent filtration function, but also effectively prevents dust and impurities from entering the main pipe 1 and adhering to the prism mechanism 11, ensuring the photoelectric liquid level sensor... The long-term stable detection performance also maintains the accuracy of its detection function. During the detection process, when no water flows through the main pipe 1, the prism structure reflects most of the light emitted by the light emitter 8 to the light receiver 9, and the light receiver 9 outputs a high voltage signal. When liquid flows through the main pipe 1, the light propagation path changes, and the prism structure reflects only a small portion of the light to the light receiver 9, and the light receiver 9 outputs a low voltage signal. This accurately determines whether there is water or not. In addition, the filter component 3 can prevent impurities from adhering to the outer surface of the prism mechanism 11 and affecting light transmission, further improving the overall convenience of the device. Combined with the detachable design of the installation mechanism 6, it provides convenience for subsequent inspection and maintenance.

[0035] This device, through the installation mechanism 6, allows the circuit board 7 to be inserted into the housing 5 of the outer casing 4 during installation, causing the light emitter 8 and light receiver 9 on the circuit board 7 to protrude from the outside of the housing 5. Then, the housing 5 is inserted into the outer casing 4. Once both are in place, the light emitter 8 and light receiver 9 move to the prism mechanism 11, and the testing can begin. During the housing 5 installation phase, the adjusting bracket 653 can be pulled outward by actuating the annular slot 654. The movement of the adjusting bracket 653 synchronously drives the two linkage plates 652, which in turn drive the two... A rotating shaft 651 causes the slider 642 to move accordingly. The linkage plate 652, the rotating shaft 651, and the adjusting bracket 653 are hinged. By pulling the adjusting bracket 653, the linkage plate 652 can be flexibly driven, which in turn pulls the slider 642 to compress the telescopic spring 641. During this process, the frame 643 automatically moves inward. The movement of the frame 643 drives the rack 661, which in turn drives the gear 663 to rotate. The rotation of the gear 663 causes the arc-shaped limiting bracket 6643 to rotate outward, thereby separating the arc-shaped limiting bracket 6643 from the arc-shaped retaining sleeve 63. After the circuit board 7 is installed, the adjusting bracket 653 is released. 53. The telescopic spring 641 returns to its original position, pulling the slider 642 inward. The slider 642 drives the rack 661, which in turn drives the gear 663 to rotate. The rotation of the gear 663 drives the connecting shaft 6641 at its top and bottom to rotate. The rotation of the connecting shaft 6641 drives the arc-shaped limiting bracket 6643 to rotate through the connecting plate 6642, so that the arc-shaped limiting bracket 6643 is precisely inserted into the arc-shaped retaining sleeve 63. Through this mutual insertion and locking method between the arc-shaped limiting bracket 6643 and the arc-shaped retaining sleeve 63, the cover plate 10 can be firmly installed on the rear side of the outer shell 4. This design can not only firmly lock and install the outer shell 4 The internal housing 5 can simultaneously fix the circuit board 7, the light transmitter 8, and the light receiver 9. When the circuit board 7 needs to be disassembled for maintenance, the annular slot 654 is pried open again, the adjustment bracket 653 is pulled out, and the two sliders 642 are pulled inward through the linkage plate 652. Using the linkage mechanism of the gear 663 and the rack 661, the arc-shaped limit bracket 6643 and the arc-shaped sleeve 63 are separated again. At this time, the cover plate 10 can be easily removed from the back of the housing 4, realizing the quick disassembly and assembly of the circuit board 7, the light transmitter 8, and the light receiver 9, which greatly improves the convenience of the overall maintenance of this device.

Claims

1. A pipeline-type photoelectric liquid level sensor, comprising a main pipe, characterized in that: Both sides of the main pipe are fixedly equipped with threaded connectors. A filter assembly is installed inside the threaded connector at the input end of the main pipe. A prism mechanism is fixedly installed on one side of the main pipe. A housing is fixedly installed on the outer side of the main pipe near the prism mechanism. A circuit board is inserted inside the housing. A light emitter is fixedly connected to one end of the circuit board near the prism mechanism, and a light receiver is fixedly connected to the other end of the circuit board near the prism mechanism. A cover plate is fixedly connected to the side of the circuit board away from the housing. A mounting mechanism is provided on the outer side of the cover plate. The cover plate is snapped into the housing through the mounting mechanism. Wiring holes are linearly arranged at equal intervals at the lower end of the cover plate. Wires are inserted into the wiring holes and are electrically connected to the circuit board.

2. The pipeline-type photoelectric liquid level sensor according to claim 1, characterized in that: The filter assembly includes an internal thread, which is formed inside the threaded interface at the input end of the main pipe. The threaded interface at the input end of the main pipe is connected to an inner tube via the internal thread, and a filter screen is fixedly installed inside the inner tube.

3. A pipeline-type photoelectric liquid level sensor according to claim 2, characterized in that: An adjusting torsion ring is fixedly installed on the outer side of the filter screen, and anti-slip arc grooves are formed on the outer surface of the adjusting torsion ring in a ring shape with equal intervals.

4. A pipeline-type photoelectric liquid level sensor according to claim 1, characterized in that: The prism mechanism includes a main frame, which is fixedly installed inside the main tube on the side near the outer shell. A first prism mirror is fixedly connected to the middle of the main frame, and second prism mirrors are fixedly installed at the top and bottom of the main frame. The light emitter emits a light beam that passes through the first and second prism mirrors and is received by the light receiver.

5. A pipeline-type photoelectric liquid level sensor according to claim 1, characterized in that: The installation mechanism includes a fixed column and a rail frame. The fixed column is fixedly connected to the top rear ends and bottom rear ends of the main frame. An arc-shaped sleeve is fixedly installed on the outer side of the fixed column. The rail frame is fixedly installed on the upper back of the cover plate. An elastic component is fixedly installed at both ends of the rail frame. An adjustment component is provided on the top of the elastic component. A snap-fit ​​component is fixedly installed at the outer end of the rail frame. The end of the snap-fit ​​component is inserted into the inside of the arc-shaped sleeve.

6. A pipeline-type photoelectric liquid level sensor according to claim 5, characterized in that: The elastic component includes a telescopic spring, which is fixedly installed at both ends inside the rail frame. A slider is fixedly installed at the outer end of the telescopic spring, and a frame is fixedly installed on the outer side of the slider. The top of the slider is linked with the adjustment component, and the outer end of the frame passes through the rail frame and is connected to the snap-fit ​​component.

7. A pipeline-type photoelectric liquid level sensor according to claim 6, characterized in that: The snap-fit ​​assembly includes a rack and a fixing frame. The rack is fixedly installed inside the frame, and the fixing frame is fixedly installed at the outer end of the rail frame. A gear is rotatably connected inside the fixing frame. The gear and the rack mesh with each other. Limiting components are fixedly installed at the top and bottom of the gear. The limiting components are inserted into the inside of the arc-shaped ferrule.

8. A pipeline-type photoelectric liquid level sensor according to claim 7, characterized in that: The limiting component includes a connecting shaft, which is fixedly installed on the top and bottom of the gear. The connecting shaft and the fixing frame are rotatably connected. A connecting plate is fixedly installed on the outer end of the connecting shaft. An arc-shaped limiting frame is fixedly installed on the side of the connecting plate near the main tube. The end of the arc-shaped limiting frame is inserted into the interior of the arc-shaped limiting sleeve. The arc-shaped limiting frame, the arc-shaped limiting sleeve, and the connecting shaft are arranged in concentric circles.

9. A pipeline-type photoelectric liquid level sensor according to claim 6, characterized in that: The adjustment assembly includes a rotating shaft rotatably connected to the top of the slider. A linkage plate is fixedly installed at the upper end of the rotating shaft. An adjustment frame is hinged to the inner side of the linkage plate, and an annular groove is provided in the middle of the inner side of the adjustment frame.

10. A pipeline-type photoelectric liquid level sensor according to claim 2, characterized in that: The filter screen is generally conical in shape, and a sealing gasket is provided on the outside of the threaded joint.

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