Non-contact photoelectric liquid level sensor

Abstract

The invention discloses a non-contact photoelectric liquid level sensor, and relates to the technical field of liquid level sensors, the non-contact photoelectric liquid level sensor comprises a protective shell, the bottom end in the protective shell is in threaded connection with a non-contact photoelectric liquid level sensor body, filtering bins are symmetrically installed at the two ends of the protective shell, placing grooves are formed in the upper ends of the filtering bins, and active carbon plates are installed in the placing grooves; a rotating plate is installed in the containing groove, a connecting mechanism is installed in the rotating plate, a pop-up mechanism is installed at the bottom end in the containing groove, limiting mechanisms are symmetrically installed in the two ends of the protective shell, and a protective cover is in threaded connection with the upper end of the protective shell. By the adoption of the structure, moisture and pollutants can be effectively prevented from entering the sensor, the service life of the sensor can be prolonged, faults and damage caused by humidity or pollution are reduced, and proper adsorption materials can be flexibly selected according to different application scenes and environment conditions.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of liquid level sensors, particularly relates to a non-contact photoelectric liquid level sensor. BACKGROUND

[0002] A photoelectric liquid level sensor is a sensor that uses photoelectric technology to detect the height of a liquid level. It is usually composed of a light emitter, a receiver and a signal processing part. The photoelectric liquid level sensor determines the liquid level height by emitting a light signal and measuring the degree of signal blocking by the liquid. When the liquid level of the liquid reaches the sensor position, the light signal will be blocked by the liquid, triggering the sensor output signal. This sensor is commonly used for liquid level monitoring and control in liquid storage tanks, tanks or pipelines. The non-contact photoelectric liquid level sensor is a sensor that detects the liquid level through optical principles without direct contact with the liquid. This sensor usually uses infrared or laser beams as light sources to determine the liquid level height by measuring the degree of light blocking by the liquid. Non-contact photoelectric liquid level sensors have the advantages of not being easily contaminated, easy maintenance, and being suitable for various liquids, and are commonly used for liquid level monitoring and control in environments where contamination needs to be avoided or the liquid is easily corroded.

[0003] The utility model discloses a kind of non-contact photoelectric liquid level sensors, the non-contact photoelectric liquid level sensor includes: shell assembly, PCB board, pair of pipe assembly and wire sealing gasket, the PCB board is arranged in the shell assembly, the pair of pipe assembly includes: emitting pair of pipe and receiving pair of pipe, the emitting pair of pipe is welded on the PCB, the emitting pair of pipe is welded on the PCB and located on the emitting pair of pipe side, one end of the wire sealing gasket is welded on PCB, the other end of the wire sealing gasket is arranged on the shell assembly, wire sealing ring is provided with wire inlet, wire is welded on the PCB by the wire inlet. Make existing photoelectric liquid level sensor not need prism to immerse in liquid to produce incrustation and affect the detection of sensor.

[0004] The above-mentioned utility model can make the existing photoelectric liquid level sensor not need prism to immerse in liquid to produce incrustation and affect the detection of sensor, but due to the long-term exposure of photoelectric liquid level sensor to humid and polluted environment, air moisture and pollutants can enter the interior of the sensor, which may cause short circuit, corrosion or damage of electronic components, thereby affecting the performance and reliability of the sensor, and may also cause mold or other pollutants in the interior of the sensor, further affecting the measurement accuracy and service life of the sensor. SUMMARY

[0005] In view of the problems mentioned in the background art, the purpose of the present application is to provide a non-contact photoelectric liquid level sensor to solve the problem that water and pollutants in the air can enter the inside of the sensor, possibly causing short circuit, corrosion or damage to the electronic components, when the photoelectric liquid level sensor is exposed to a humid and polluted environment for a long time.

[0006] The above technical purpose of the present application is achieved by the following technical solutions:

[0007] A non-contact photoelectric liquid level sensor comprises a protective shell, a non-contact photoelectric liquid level sensor body is threadedly connected to the inside bottom end of the protective shell, filter bins are symmetrically installed at both ends of the protective shell, a placing groove is formed in the upper end of the filter bin, an activated carbon plate is installed in the inside of the placing groove, a rotating plate is installed in the inside of the placing groove, a connecting mechanism is installed in the inside of the rotating plate, a pop-up mechanism is installed at the bottom end of the inside of the placing groove, a limiting mechanism is symmetrically installed in the inside of both ends of the protective shell, and a protective cover is threadedly connected to the upper end of the protective shell.

[0008] The connecting mechanism comprises a first reset spring, a moving block, a fixed block, a sliding block and a push block, a first containing cavity is formed in the inside of the rotating plate, a first reset spring is fixedly connected to one end of the inside of the first containing cavity, a moving block is fixedly connected to the other end of the first reset spring, a fixed block is fixedly connected to the end of the moving block away from the reset spring, the end of the fixed block away from the moving block extends out of one end of the rotating plate, a sliding block is fixedly connected to the upper end of the fixed block, a push block is fixedly connected to the end of the sliding block away from the fixed block, a sliding groove is formed in the upper end of the rotating plate, the sliding groove is in communication with the first containing cavity, the sliding groove and the sliding block are in sliding connection, a movable slot is formed in one end of the rotating plate, the movable slot is in communication with the first containing cavity, the movable slot and the fixed block are in sliding connection, a fixing slot is formed in one end of the inside of the placing groove, the fixed block penetrates through the movable slot and is inserted into the fixing slot, and a rotating column is rotatably connected to one end of the inside of the placing groove, the rotating column is fixedly connected to the outer side wall of the rotating plate.

[0009] As a preferred technical solution, the pop-up mechanism comprises an embedded hole, a second reset spring, a moving column and a pressing plate, the embedded hole is symmetrically formed in the inside of the placing groove, a second reset spring is fixedly connected to one end of the inside of the embedded hole, a moving column is fixedly connected to the other end of the second reset spring, the moving column and the embedded hole are in sliding connection, a pressing plate is fixedly connected to the end of the moving column away from the second reset spring, and the user does not need to use tools or screwdrivers and other auxiliary equipment, but only needs to simply operate to pop out the old activated carbon plate and insert a new activated carbon plate, thereby reducing the maintenance time and improving the work efficiency.

[0010] As a preferred technical scheme, the limiting mechanism comprises a third reset spring, a moving plate, a pressing block and a clamping block, second accommodating cavities are symmetrically formed at two ends of the protective shell, third reset springs are symmetrically and fixedly connected at one end of the second accommodating cavities, the moving plate is fixedly connected at the other end of the third reset springs, the pressing block and the clamping block are fixedly connected at the end of the moving plate away from the third reset springs, the pressing block and the clamping block are extended from one end of the protective shell, clamping grooves are symmetrically formed at one end of the filter bin close to the protective shell, the clamping grooves are clamped with the clamping blocks, T-shaped grooves are symmetrically formed at two ends of the protective shell and the protective cover, T-shaped blocks are symmetrically and fixedly connected at one end of the filter bin close to the protective shell, and the T-shaped blocks are slidably connected with the T-shaped grooves, whether the filter bin is installed or not can be flexibly determined according to specific application scenarios and environmental conditions, and the adaptability and expansibility of the sensor are improved.

[0011] As a preferred technical scheme, the protective shell is symmetrically provided with a plurality of heat dissipation holes at two ends, and a filter screen is fixedly connected in the heat dissipation holes, which can prevent the sensor from being overheated and degraded or damaged in performance, thereby effectively protecting the electronic elements and circuits inside the sensor and prolonging the service life thereof.

[0012] As a preferred technical scheme, the filter bin is provided with a communication groove at one end close to the protective shell, the communication groove is communicated with the placing groove, the filter bin is provided with a plurality of ventilation holes at an end away from the communication groove, the ventilation holes are communicated with the placing groove, the filter bin is provided with an installation groove at the end away from the communication groove, an installation frame is installed in the installation groove, a filter plate is fixedly connected in the installation frame, a plurality of magnetic attraction grooves are symmetrically formed at the corners of the installation frame close to the filter bin, and a plurality of magnetic attraction blocks are symmetrically and fixedly connected at the corners of the installation frame, the magnetic attraction blocks are magnetically connected with the magnetic attraction grooves, the filter plate can be replaced or cleaned in time, the filter plate is prevented from being blocked by pollutants, and the maintenance time and cost are reduced.

[0013] In summary, the present application mainly has the following advantages:

[0014] First, when the active carbon plate inside the placing groove needs to be replaced, the user pushes the push block, the sliding block slides in the sliding groove, the sliding block drives the moving block fixing block to move, the fixing block retracts into the first containing cavity, the fixing block and the fixing groove end the insertion, then the rotating plate is opened upwards, the second reset spring is reset, the moving column drives the pressing plate to rebound, the active carbon plate inside the placing groove is ejected, the user replaces the active carbon plate, then reverse operation can complete the installation of the movable plate, complete the replacement of the active carbon plate, can effectively prevent moisture and pollutants from entering the sensor, help to prolong the service life of the sensor, reduce the failure and damage caused by dampness or pollution, and different application scenes and environmental conditions can be flexibly selected according to the suitable adsorption material. For example, for high humidity environment, the adsorption assembly with stronger moisture absorption performance can be selected; for the environment with specific pollutants, the assembly with targeted adsorption capacity can be selected. The adaptability and reliability of the sensor are improved;

[0015] Second, when the filter bin needs to be installed, the user presses the press block, the moving plate drives the clamping block to move, the clamping block retracts to the second containing cavity, then the filter bin is combined with the protective shell and the protective cover, the T-shaped block is slid with the T-shaped groove, then the press block is released, the third reset spring is reset, the moving plate rebounds to drive the clamping block to pop out, the clamping block is clamped and fixed with the clamping groove, the installation of the filter bin is completed, reverse operation can complete the disassembly of the filter bin, which facilitates the user to install and disassemble the filter bin, and whether to install the filter bin can be flexibly determined according to the specific application scene and environmental condition. For example, in some dry and clean environment, the filter bin may not be needed to be installed; while in high humidity or heavily polluted environment, the installation of the filter bin can improve the protection performance of the sensor, so that the sensor can adapt to various different environmental requirements, and can help to reduce the maintenance time and difficulty, improve the availability of the equipment, at the same time, the user is provided with the option of whether to purchase the filter bin according to the actual demand, which reduces the procurement cost of the user. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a perspective structural schematic diagram of the present application;

[0017] Figure 2 is a perspective structural schematic diagram of the protective shell of the present application;

[0018] Figure 3 is a perspective structural schematic diagram of the non-contact photoelectric liquid level sensor body of the present application;

[0019] Figure 4 is a sectional perspective structural schematic diagram of the limiting mechanism of the present application;

[0020] Figure 5It is a filter bin three-dimensional structure schematic diagram of the present application;

[0021] Figure 6 It is a filter bin cross section three-dimensional structure schematic diagram of the present application;

[0022] Figure 7 It is a filter bin three-dimensional structure schematic diagram of the present application; Figure 6 The enlarged view of A part of the filter bin;

[0023] Figure 8 It is a filter bin cross section three-dimensional structure schematic diagram of the present application.

[0024] Fig. 1, protective shell, 2, non-contact photoelectric liquid level sensor body, 3, heat dissipation hole, 4, filter screen, 5, filter bin, 6, T-shaped groove, 7, T-shaped block, 8, placing groove, 9, rotating column, 10, rotating plate, 11, first containing cavity, 12, connecting mechanism, 121, first reset spring, 122, moving block, 123, fixed block, 124, sliding block, 125, push block, 13, movable groove, 14, fixed groove, 15, sliding groove, 16, ejection mechanism, 161, built-in hole, 162, second reset spring, 163, moving column, 164, pressing plate, 17, communication groove, 18, ventilation hole, 19, mounting groove, 20, mounting frame, 21, filter plate, 22, magnetic attraction block, 23, magnetic attraction groove, 24, limiting mechanism, 241, third reset spring, 242, moving plate, 243, press block, 244, clamping block, 25, second containing cavity, 26, clamping groove, 27, protective cover, 28, activated carbon plate. DETAILED DESCRIPTION

[0025] Example 1

[0026] Reference Figures 1 to 8 The non-contact photoelectric liquid level sensor provided by the embodiment comprises a protective shell 1, a non-contact photoelectric liquid level sensor body 2 is screw-connected to the bottom end inside the protective shell 1, filter bins 5 are symmetrically installed at both ends of the protective shell 1, a placing groove 8 is formed in the upper end of each filter bin 5, an activated carbon plate 28 is installed in the placing groove 8, a rotating plate 10 is installed in the placing groove 8, a connecting mechanism 12 is installed in the rotating plate 10, an ejection mechanism 16 is installed at the bottom end inside the placing groove 8, limiting mechanisms 24 are symmetrically installed inside the protective shell 1 at both ends, a protective cover 27 is screw-connected to the upper end of the protective shell 1, and the non-contact photoelectric liquid level sensor body 2 comprises a light source, a photoelectric converter, an optical system and a signal processing circuit. The light emitted by the light source is irradiated to the liquid surface to be measured through the optical system, the reflected light is received by the photoelectric converter and converted into an electric signal after being reflected by the liquid surface, the electric signal is processed by the signal processing circuit, and thus the liquid level information is obtained.

[0027] The connecting mechanism 12 comprises a first reset spring 121, a moving block 122, a fixed block 123, a sliding block 124 and a pushing block 125, the first accommodating cavity 11 is internally formed in the rotating plate 10, the first reset spring 121 is fixedly connected to one end in the first accommodating cavity 11, the moving block 122 is fixedly connected to the other end of the first reset spring 121, the fixed block 123 is fixedly connected to the end of the moving block 122 away from the reset spring, the end of the fixed block 123 away from the moving block 122 extends out of one end of the rotating plate 10, the sliding block 124 is fixedly connected to the upper end of the fixed block 123, the pushing block 125 is fixedly connected to the end of the sliding block 124 away from the fixed block 123, the sliding groove 15 is formed in the upper end of the rotating plate 10, the sliding groove 15 is in communication with the first accommodating cavity 11, the sliding groove 15 is in sliding connection with the sliding block 124, the movable slot 13 is formed in one end of the rotating plate 10, the movable slot 13 is in communication with the first accommodating cavity 11, the movable slot 13 is in sliding connection with the fixed block 123, the fixed slot 14 is formed in one end in the placing groove 8, the fixed block 123 penetrates through the movable slot 13 and is in insertion with the fixed slot 14, the rotating column 9 is rotatably connected to one end in the placing groove 8, the rotating plate 10 is fixedly connected to the outer side wall of the rotating column 9, the user pushes the pushing block 125, so that the sliding block 124 slides in the sliding groove 15, at the same time, the sliding block 124 drives the moving block 122 and the fixed block 123 to move, the fixed block 123 is retracted into the first accommodating cavity 11, the fixed block 123 ends the insertion with the fixed slot 14, then the rotating plate 10 is opened upward, the user replaces the activated carbon plate 28, then reversely operates to complete the installation of the movable plate and the replacement of the activated carbon plate 28.

[0028] With reference to Figure 6 The ejecting mechanism 16 comprises an embedded hole 161, a second reset spring 162, a moving column 163 and a pressing plate 164, the embedded hole 161 is symmetrically formed in the placing groove 8, the second reset spring 162 is fixedly connected to one end in the embedded hole 161, the moving column 163 is fixedly connected to the other end of the second reset spring 162, the moving column 163 is in sliding connection with the embedded hole 161, the pressing plate 164 is fixedly connected to the end of the moving column 163 away from the second reset spring 162, the user puts the activated carbon plate 28 into the placing groove 8, then presses the activated carbon plate 28 downward, the activated carbon plate 28 drives the pressing plate 164 to press downward, then the rotating plate 10 is fixed through the connecting mechanism 12 to complete the installation of the activated carbon plate 28.

[0029] With reference to Figure 4, the limiting mechanism 24 comprises a third reset spring 241, a moving plate 242, a pressing block 243 and a clamping block 244, the protective shell 1 is symmetrically provided with a second containing cavity 25 at two ends, the second containing cavity 25 is symmetrically fixedly connected with the third reset spring 241 at one end, the third reset spring 241 is fixedly connected with the moving plate 242 at the other end, the moving plate 242 is fixedly connected with the pressing block 243 and the clamping block 244 at the end away from the third reset spring 241, the pressing block 243 and the clamping block 244 extend out of one end of the protective shell 1 at the end away from the moving plate 242, the filter bin 5 is symmetrically provided with a clamping groove 26 at the end close to the protective shell 1, the clamping groove 26 is clamped with the clamping block 244, the protective shell 1 and the protective cover 27 are symmetrically provided with a T-shaped slot 6 at two ends, the filter bin 5 is symmetrically fixedly connected with a T-shaped block 7 at the end close to the protective shell 1, the T-shaped block 7 is slidably connected with the T-shaped slot 6, the user presses the pressing block 243, the moving plate 242 drives the clamping block 244 to move, the clamping block 244 is retracted towards the second containing cavity 25, then the filter bin 5, the protective shell 1 and the protective cover 27 are combined, the T-shaped block 7 is slidably connected with the T-shaped slot 6, then the pressing block 243 is released, the third reset spring 241 is reset, the moving plate 242 rebounds to drive the clamping block 244 to pop out, the clamping block 244 is clamped and fixed with the clamping groove 26, and the installation of the filter bin 5 is completed, and the filter bin 5 can be disassembled by reverse operation.

[0030] Reference Figure 3 , the protective shell 1 is symmetrically provided with a heat dissipation hole 3 at two ends, the heat dissipation hole 3 is fixedly connected with a filter screen 4, the heat generated in the non-contact photoelectric liquid level sensor body 2 is dissipated to the external environment through the heat dissipation hole 3, and the filter screen 4 can prevent dust, dirt and other external impurities from entering the sensor through the heat dissipation hole 3.

[0031] Reference Figure 8 , the filter bin 5 is provided with a communication groove 17 at the end close to the protective shell 1, the communication groove 17 is in communication with the placement groove 8, the filter bin 5 is symmetrically provided with a ventilation hole 18 at the end away from the communication groove 17, the ventilation hole 18 is in communication with the placement groove 8, the filter bin 5 is provided with a mounting groove 19 at the end away from the communication groove 17, the mounting groove 19 is internally provided with a mounting frame 20, the mounting frame 20 is fixedly connected with a filter plate 21, air in the external environment is first filtered through the filter plate 21, then enters the placement groove 8 through the ventilation hole 18, is purified through the activated carbon plate 28, and enters the protective shell 1 through the communication groove 17 and the heat dissipation hole 3 to dissipate heat for the non-contact photoelectric liquid level sensor body 2.

[0032] Reference Figure 8, the installation frame 20 is symmetrically provided with a magnetic attraction groove 23 near the chamfer of one end of the filter bin 5, and a magnetic attraction block 22 is symmetrically fixedly connected to the chamfer of one end of the installation groove 19, the magnetic attraction block 22 is magnetically connected with the magnetic attraction groove 23, the user pulls the installation frame 20 outward, the magnetic attraction block 22 and the magnetic attraction groove 23 end the magnetic attraction connection, the installation frame 20 and the filter plate 21 are removed, and the filter plate 21 is disassembled.

[0033] Principle and advantages: according to the environmental conditions, first, the user presses the press block 243, the moving plate 242 drives the clamping block 244 to move, the clamping block 244 shrinks to the direction of the second containing cavity 25, then the filter bin 5 is combined with the protective shell 1 and the protective cover 27, the T-shaped block 7 is slid with the T-shaped groove 6, then the press block 243 is released, the third reset spring 241 is reset, the moving plate 242 rebounds to drive the clamping block 244 to pop out, the clamping block 244 is clamped and fixed with the clamping groove 26, the installation of the filter bin 5 is completed, then the user pushes the push block 125, the sliding block 124 slides in the sliding groove 15, and the sliding block 124 drives the moving block 122 and the fixed block 123 to move, the fixed block 123 retracts into the first containing cavity 11, the fixed block 123 ends the insertion with the fixed groove 14, the rotating plate 10 is opened upward, the user puts the activated carbon plate 28 into the placing groove 8, then presses the activated carbon plate 28 downward, the activated carbon plate 28 drives the pressing plate 164 to press downward, then the reverse operation of the connecting mechanism 12 fixes the rotating plate 10, the installation of the activated carbon plate 28 is completed, the air in the external environment is first filtered by the filter plate 21, then enters the placing groove 8 through the ventilation hole 18, is purified by the activated carbon plate 28, and enters the protective shell 1 through the communication groove 17 and the heat dissipation hole 3 to dissipate heat for the non-contact photoelectric liquid level sensor body 2.

[0034] The application can effectively prevent moisture and pollutants from entering the sensor, help to prolong the service life of the sensor, reduce failures and damages caused by moisture or pollution, and can flexibly select suitable adsorbent materials according to different application scenes and environmental conditions, and can select components with targeted adsorption capacity for environments with specific pollutants. The adaptability and reliability of the sensor are improved, and the user is provided with the option of whether to purchase the filter bin 5 according to actual needs, thereby reducing the procurement cost of the user.

Claims

1. A non-contact photoelectric liquid level sensor comprising a protective housing, characterized in that: The inside bottom end of the protective shell is threadedly connected with a non-contact photoelectric liquid level sensor body, both ends of the protective shell are symmetrically provided with filter bins, the upper end of each filter bin is provided with a placing groove, an activated carbon plate is installed in the placing groove, a rotating plate is installed in the placing groove, a connecting mechanism is installed in the rotating plate, a pop-up mechanism is installed at the inside bottom end of the placing groove, limit mechanisms are symmetrically installed in the inside of both ends of the protective shell, and a protective cover is threadedly connected with the upper end of the protective shell; The connecting mechanism comprises a first reset spring, a moving block, a fixed block, a sliding block and a push block, a first containing cavity is formed in the rotating plate, one end of the first containing cavity is fixedly connected with the first reset spring, the other end of the first reset spring is fixedly connected with the moving block, the end of the moving block away from the reset spring is fixedly connected with the fixed block, the end of the fixed block away from the moving block extends out of one end of the rotating plate, the upper end of the fixed block is fixedly connected with the sliding block, and the end of the sliding block away from the fixed block is fixedly connected with the push block.

2. A non-contact photoelectric liquid level sensor according to claim 1, characterized in that: A sliding groove is formed in the upper end of the rotating plate, the sliding groove is communicated with the first containing cavity, the sliding groove is in sliding connection with the sliding block, an activity groove is formed in one end of the rotating plate, the activity groove is communicated with the first containing cavity, and the activity groove is in sliding connection with the fixed block, a fixing groove is formed in one end of the placing groove, and the fixed block penetrates through the activity groove and is inserted into the fixing groove.

3. A non-contact photoelectric liquid level sensor according to claim 1, wherein: A rotating column is rotatably connected to one end of the placing groove, and the outer side wall of the rotating column is fixedly connected with the rotating plate.

4. The non-contact photoelectric liquid level sensor of claim 1, wherein: The pop-up mechanism comprises an embedded hole, a second reset spring, a moving column and a pressing plate, the embedded holes are symmetrically formed in the placing groove, one end of each embedded hole is fixedly connected with the second reset spring, the other end of the second reset spring is fixedly connected with the moving column, the moving column is in sliding connection with the embedded hole, and the end of the moving column away from the second reset spring is fixedly connected with the pressing plate.

5. A non-contact photoelectric liquid level sensor according to claim 1, wherein: T-shaped grooves are symmetrically formed in both ends of the protective shell and the protective cover, T-shaped blocks are symmetrically fixedly connected to the end of the filter bin close to the protective shell, and the T-shaped blocks are in sliding connection with the T-shaped grooves.

6. A non-contact photoelectric liquid level sensor according to claim 1, wherein: The limit mechanism comprises a third reset spring, a moving plate, a pressing block and a clamping block, second containing cavities are symmetrically formed in the inside of both ends of the protective shell, one end of each second containing cavity is symmetrically fixedly connected with the third reset spring, the other end of the third reset spring is fixedly connected with the moving plate, the end of the moving plate away from the third reset spring is fixedly connected with the pressing block and the clamping block, and the ends of the pressing block and the clamping block away from the moving plate extend out of one end of the protective shell.

7. The non-contact photoelectric liquid level sensor of claim 1, wherein: Clamping grooves are symmetrically formed in the end of the filter bin close to the protective shell, and the clamping grooves are in clamping connection with the clamping blocks.

8. The non-contact photoelectric liquid level sensor of claim 1, wherein: Cooling holes are symmetrically formed in both ends of the protective shell, and filter screens are fixedly connected in the cooling holes.

9. The non-contact photoelectric liquid level sensor of claim 1, wherein: A communication groove is formed in the end of the filter bin close to the protective shell, the communication groove is communicated with the placing groove, ventilation holes are symmetrically formed in the end of the filter bin away from the communication groove, the ventilation holes are communicated with the placing groove, an installation groove is formed in the end of the filter bin away from the communication groove, an installation frame is installed in the installation groove, and a filter plate is fixedly connected in the installation frame.

10. A non-contact photoelectric liquid level sensor according to claim 9, wherein: The installation frame is symmetrically provided with a magnetic attraction slot at the end of the filter bin, and a magnetic attraction block is symmetrically fixed at the end of the installation slot.

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