High-temperature-resistant photoelectric liquid level sensor

Abstract

The invention relates to the technical field of liquid level sensors, and particularly discloses a high-temperature-resistant photoelectric liquid level sensor which comprises a mounting plate, a protective shell is movably connected to one end of the mounting plate, a liquid level sensor body is fixedly connected into the protective shell, mounting grooves are symmetrically formed in the two ends of the protective shell, and filter bins are inserted into the mounting grooves. A fixing assembly is installed in the baffle, a pop-up assembly is installed at the bottom end in the containing groove, through holes are symmetrically formed in the end, close to the protective shell, of the containing groove, cooling fans are electrically connected into the through holes, and a blocking net is movably connected to the other ends of the through holes. By adopting the structure, the internal temperature of the sensor can be effectively reduced, the sensor is ensured to work in a normal temperature range, so that the stability and the reliability of the sensor are improved, moisture in air can be effectively absorbed, corrosion and damage of humidity to internal elements of the sensor are reduced, and stable operation of the sensor is further ensured.

Description

Technical Field

[0001] The invention relates to the technical field of liquid level sensors, in particular to a high temperature resistant photoelectric liquid level sensor. Background Art

[0002] A liquid level sensor is a sensing device used to detect and monitor the liquid level in a liquid container. The liquid level sensor can convert the liquid level into a standard electrical signal output and transmit it to the display, recording, and control equipment. The photoelectric liquid level sensor contains a near-infrared light-emitting diode and a photosensitive receiver. When the liquid submerges the lens of the photoelectric liquid level switch, the light emitted by the light-emitting diode is refracted into the liquid, so that the receiver can only receive a small amount of light or no light. After this change in working condition is sensed by the receiver, it can drive the internal electrical switch to activate the external alarm or control circuit. If there is no liquid, the light emitted by the light-emitting diode is directly reflected from the lens back to the receiver.

[0003] Publication number "CN214748298U" is a high-temperature resistant photoelectric liquid level sensor, comprising: a high-temperature resistant protective shell, the high-temperature resistant protective shell is sealed and installed in the sensor installation hole on the material storage tank, the photoelectric liquid level sensor is installed on the high-temperature resistant protective shell on the inner side of the material storage tank, and the shell fixing seat is installed on the high-temperature resistant protective shell on the outer side of the material storage tank, the shell fixing seat is fixedly installed on the material storage tank, the shell fixing seat is provided with a heat dissipation fixing seat, and the heat dissipation fixing seat is provided with a sensor heat dissipation device, the high-temperature resistant protective shell includes an insulating shell, a sensor controller is provided in the insulating shell, a plurality of sensor probe fixing seats are provided on the insulating shell, and a photoelectric liquid level sensor probe is provided on the sensor probe fixing seat. The present invention can make the photoelectric liquid level sensor suitable for high-temperature environment, and can actively control the sensor data processing working temperature to improve the working life of the sensor.

[0004] Although the above invention can make the photoelectric liquid level sensor suitable for high temperature environment and can actively control the sensor data processing working temperature to improve the sensor working life, the cooling fan is directly exposed to the working environment. Impurities such as dust, dirt and water vapor in the environment can easily enter the sensor through the cooling fan. Pollutants such as dust, dirt and water vapor will adhere to the circuit board, lens or other key components of the sensor, resulting in performance degradation. In addition, dust and dirt may clog the fan blades or heat dissipation holes, resulting in reduced heat dissipation efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a high-temperature resistant photoelectric liquid level sensor to solve the problem proposed in the above background technology that the cooling fan is directly exposed to the working environment, and impurities such as dust, dirt and water vapor in the environment can easily enter the sensor through the cooling fan. Pollutants such as dust, dirt and water vapor will adhere to the circuit board, lens or other key components of the sensor, resulting in performance degradation.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a high-temperature resistant photoelectric liquid level sensor, including a mounting plate, one end of the mounting plate is symmetrically provided with mounting holes, one end of the mounting plate is movably connected with a protective shell, a liquid level sensor body is fixedly connected inside the protective shell, a liquid level sensor probe is symmetrically installed at the bottom end of the liquid level sensor body, one end of the liquid level sensor probe is away from the liquid level sensor body and extends out of the bottom end of the protective shell, mounting grooves are symmetrically provided at both ends of the protective shell, a filter bin is plugged into the mounting groove, a fixing plate is fixedly connected to the outside of the filter bin, a placement groove is provided at the upper end of the filter bin, a baffle is rotatably connected to one end of the placement groove, and the baffle is inside A fixing component is installed at the bottom of the placement groove, a pop-up component is installed at the bottom of the placement groove, a moisture-absorbing bag is placed inside the placement groove, through holes are symmetrically opened at one end of the placement groove close to the protective shell, a cooling fan is electrically connected inside the through hole, and a blocking net is movably connected to the other end of the through hole. Connecting blocks are symmetrically fixedly connected at both ends of the protective shell, and connecting components are symmetrically installed inside the connecting blocks, which can effectively reduce the internal temperature of the sensor and ensure that it works within the normal temperature range, thereby improving its stability and reliability, and can effectively absorb moisture in the air, reduce the corrosion and damage of humidity to the internal components of the sensor, and further ensure the stable operation of the sensor;

[0007] The fixing component includes a accommodating chamber, a second return spring, a moving block, a fixed column, a sliding block and a pushing block. The baffle is provided with a accommodating chamber, one end of the accommodating chamber is fixedly connected to the second return spring, the other end of the second return spring is fixedly connected to the moving block, the moving block and the accommodating chamber are slidably connected, one end of the moving block away from the second return spring is fixedly connected to the fixing column, one end of the fixed column away from the moving block extends out of the side end of the baffle, the upper end of the moving block is fixedly connected to the sliding block, one end of the sliding block away from the moving block extends out of the upper end of the baffle and is fixedly connected to the pushing block, a sliding groove is provided at the upper end of the baffle, the sliding groove and the accommodating chamber are slidably connected, the sliding groove and the sliding block are slidably connected, a circular groove is provided at one end of the placement groove close to the baffle, and the circular groove is plug-in connected to the fixed column. According to different application environments and requirements, users can choose different additional components, such as moisture absorbent bags, activated carbon plates, etc., to meet specific usage requirements.

[0008] In a further embodiment, the pop-up assembly includes a built-in hole, a first return spring, a movable column and a spring plate. The built-in holes are symmetrically opened at the bottom end of the placement groove. The first return spring is fixedly connected to one end of the built-in hole, and the other end of the first return spring is fixedly connected to the movable column. The movable column and the built-in hole are slidably connected. The end of the movable column away from the first return spring is fixedly connected to the spring plate, and the end of the spring plate away from the movable column is in contact with the bottom end of the moisture-absorbing bag, which makes it simple and quick to replace the moisture-absorbing bag without complicated disassembly or maintenance procedures, which greatly reduces maintenance costs and improves maintenance efficiency.

[0009] In a further embodiment, the connecting component includes a cavity, a third return spring, a movable plate and a locking block, a cavity is opened inside the connecting block, one end of the cavity is fixedly connected to the third return spring, the other end of the third return spring is fixedly connected to the movable plate, the movable plate and the cavity are slidingly connected, the end of the movable plate away from the third return spring is fixedly connected to the locking block, the end of the locking block away from the movable plate is fixedly connected to the locking block, the end of the locking block away from the protective shell is set as an inclined surface, the end of the fixed plate close to the protective shell is symmetrically opened with connecting grooves, the connecting grooves and the connecting block are plug-in, a locking groove is opened inside the connecting groove, and the lock The tightening groove and the locking block are snap-connected, and an unlocking block is slidably connected inside the locking groove. The end of the unlocking block away from the locking block extends out of the side end of the fixed plate, and the two ends of the unlocking block are symmetrically fixedly connected to the limiting blocks. The limiting grooves are symmetrically arranged at both ends of the locking groove, and the limiting grooves and the limiting blocks are slidably connected. The chamfered end of the fixed plate close to the protective shell is symmetrically fixedly connected with positioning columns, and positioning grooves are symmetrically arranged at both ends of the protective shell, and the positioning grooves and the positioning columns are plug-in. Users can easily complete the operation without complicated tools or steps, and do not need to rely on professional technicians, which can greatly reduce maintenance time and cost during the maintenance process.

[0010] In a further embodiment, a concave block is symmetrically fixedly connected to one end of the mounting plate close to the protective shell, and fixed blocks are symmetrically fixedly connected to the upper and bottom ends of the protective shell. The fixed block and the concave block are slidably connected, and the fixed block and the concave block are fixed by fixing bolts. A knob is fixedly connected to the upper end of the fixing bolt, so that the sensor housing can be quickly removed from the mounting plate and the liquid level sensor body inside the sensor housing can be maintained without disassembling other equipment or structures, thereby saving maintenance time and cost.

[0011] In a further embodiment, a fixing groove is opened at one end of the filter bin away from the cooling fan, a fixing frame is magnetically connected to the inside of the fixing groove, and a filter net is fixedly connected to the inside of the fixing frame, which facilitates the user to regularly clean the filter net. By regularly cleaning the filter net, dust accumulation can be effectively avoided and damage to the liquid level sensor body caused by impurities can be reduced.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] First, in the present invention, the cooling fan is started and controlled to rotate forward and reverse, wherein the cooling fan on one side blows external air into the interior of the protective shell, the blown air is first filtered through the filter screen, and finally filtered through the moisture-absorbing bag for the second time, the filtered air enters the interior of the protective shell through the heat dissipation holes, and dissipates the heat of the liquid level sensor, while the cooling fan on the other side blows out the heat inside the protective shell, and completes the heat dissipation inside the protective shell, which can effectively reduce the internal temperature of the sensor, ensure that it works within the normal temperature range, thereby improving its stability and reliability, and can effectively absorb moisture in the air, reduce the corrosion and damage of humidity to the internal components of the sensor, further ensure the stable operation of the sensor, and at the same time can reduce the environmental humidity, avoid electrical failures caused by moisture, thereby reducing sensor failures caused by humidity, and further extending its service life;

[0014] Secondly, in the present invention, the push block is pushed to make the slider slide inside the slide groove, the slider drives the moving block and the fixed column to move, the fixed column retracts into the accommodating cavity, the fixed column and the circular groove are plugged in, then the baffle is opened, the moisture absorbent bag is placed in the placement groove, and the moisture absorbent bag is pressed against the spring plate, the spring plate drives the moving column to slide inside the built-in hole, the moving column is pressed against the first return spring, the first return spring is compressed, and then the baffle is closed, and the push block is released at the same time, the second return spring is reset, the moving block rebounds and drives the fixed column to pop out, the fixed column and the circular groove are plugged in and fixed, and the installation of the moisture absorbent bag is completed. According to different application environments and needs, users can choose different additional components, such as moisture absorbent bags, activated carbon plates, etc., to meet specific usage requirements. By controlling humidity and reducing pollution, the sensor can work more stably and reduce failures and errors caused by environmental factors.

[0015] Thirdly, in the present invention, the filter bin is inserted into the mounting groove of the protective shell so that the filter bin and the mounting groove are plugged in, the fixing plate and the protective shell are fitted, and at the same time the connecting block is inserted into the connecting groove, and the positioning column is inserted into the positioning groove. During the insertion process, the extrusion force exerts pressure on the inclined surface of one end of the locking block, so that the locking block drives the movable plate to compress the third reset spring, and the locking block retracts into the cavity. Then, when the locking block moves to the locking groove, the third reset spring resets, and the movable plate rebounds to drive the locking block to pop out, and the locking block is clamped and fixed to the locking groove to complete the installation of the filter bin. This can ensure a firm connection between the filter bin and the sensor housing, reduce the risk of falling off due to vibration or other external forces, improve the installability, and the user can easily complete the operation without complicated tools or steps, and does not need to rely on professional technicians, which can greatly reduce the maintenance time and cost during the maintenance process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a schematic diagram of the three-dimensional structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the three-dimensional structure of the liquid level sensor body in the present invention;

[0018] Figure 3 It is a schematic diagram of the three-dimensional structure of the installation slot in the present invention;

[0019] Figure 4 This is a schematic diagram of the three-dimensional structure of the filter bin in the present invention;

[0020] Figure 5 It is a schematic diagram of the cross-sectional three-dimensional structure of the fixing component in the present invention;

[0021] Figure 6 It is a schematic diagram of the three-dimensional structure of the filter screen in the present invention;

[0022] Figure 7 It is a schematic diagram of a three-dimensional structure of a pop-up component in the present invention;

[0023] Figure 8 It is a schematic diagram of the cross-sectional three-dimensional structure of the connection component in the present invention.

[0024] In the figure: 1, mounting plate; 2, mounting hole; 3, concave block; 4, protective shell; 5, fixing block; 6, fixing bolt; 7, knob; 8, liquid level sensor body; 9, liquid level sensor probe; 10, mounting slot; 11, heat dissipation hole; 12, filter compartment; 13, fixing plate; 14, placement slot; 15, baffle; 16, pop-up assembly; 161, built-in hole; 162, first return spring; 163, moving column; 164, spring plate; 17, fixing assembly; 171, accommodating cavity; 172, second return spring; 173, moving Block; 174, fixed column; 175, slider; 176, push block; 18, slide groove; 19, circular groove; 20, moisture absorbing bag; 21, through hole; 22, cooling fan; 23, baffle; 24, positioning column; 25, positioning groove; 26, connecting block; 27, connecting groove; 28, connecting assembly; 281, cavity; 282, third return spring; 283, movable plate; 284, locking block; 29, locking groove; 30, unlocking block; 31, limit block; 32, limit groove; 33, fixed groove; 34, fixed frame; 35, filter. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1-Figure 8 In the embodiment of the present invention, a mounting plate 1 is included, a mounting hole 2 is symmetrically provided at one end of the mounting plate 1, a protective shell 4 is movably connected to one end of the mounting plate 1, a liquid level sensor body 8 is fixedly connected inside the protective shell 4, a liquid level sensor probe 9 is symmetrically provided at the bottom end of the liquid level sensor body 8, and the end of the liquid level sensor probe 9 away from the liquid level sensor body 8 extends out of the bottom end of the protective shell 4, mounting grooves 10 are symmetrically provided at both ends of the protective shell 4, a filter bin 12 is plugged into the mounting groove 10, a fixing plate 13 is fixedly connected to the outside of the filter bin 12, a placement groove 14 is provided at the upper end of the filter bin 12, a baffle 15 is rotatably connected to one end of the placement groove 14, a fixing component 17 is installed inside the baffle 15, a pop-up component 16 is installed at the bottom end of the placement groove 14, a moisture-absorbing bag 20 is placed inside the placement groove 14, and through holes are symmetrically provided at one end of the placement groove 14 close to the protective shell 4 21, a cooling fan 22 is electrically connected inside the through hole 21, and a blocking net 23 is movably connected to the other end of the through hole 21. Connecting blocks 26 are symmetrically fixedly connected to both ends of the protective shell 4, and connecting components 28 are symmetrically installed inside the connecting blocks 26. A plurality of holes are symmetrically opened on the surface of the moisture-absorbing bag 20. The cooling fan 22 is started and controlled to rotate forward and reverse. The cooling fan 22 on one side blows external air into the protective shell 4. The blown air is first filtered through the filter net 35 for the first time, and finally filtered through the moisture-absorbing bag 20 for the second time. The filtered air passes through the holes opened on the surface of the moisture-absorbing bag 20 and enters the inside of the through hole 21, and then enters the inside of the protective shell 4 through the heat dissipation holes 11 to dissipate heat to the liquid level sensor body 8. At the same time, the cooling fan 22 on the other side blows out the heat inside the protective shell 4 to complete the heat dissipation inside the protective shell 4.

[0027] The fixing assembly 17 includes a housing chamber 171, a second return spring 172, a moving block 173, a fixing column 174, a sliding block 175 and a pushing block 176. The baffle 15 is provided with a housing chamber 171, one end of the housing chamber 171 is fixedly connected to the second return spring 172, the other end of the second return spring 172 is fixedly connected to the moving block 173, the moving block 173 is slidably connected to the housing chamber 171, one end of the moving block 173 away from the second return spring 172 is fixedly connected to the fixing column 174, the end of the fixing column 174 away from the moving block 173 extends out of the side end of the baffle 15, the upper end of the moving block 173 is fixedly connected to the sliding block 175, the end of the sliding block 175 away from the moving block 173 extends out of the upper end of the baffle 15 and is fixedly connected to the pushing block 176, the upper end of the baffle 15 is provided with a sliding groove 18, the sliding groove 18 is slidably connected to the housing chamber 171, the sliding groove 18 is slidably connected to the sliding block 175, and the interior of the placement groove 14 is provided with a sliding groove 18. A circular groove 19 is provided at one end near the baffle 15, and the circular groove 19 is plugged with the fixed column 174. The push block 176 is pushed to make the slider 175 slide inside the slide groove 18. The slider 175 drives the moving block 173 and the fixed column 174 to move. The fixed column 174 retracts into the accommodating chamber 171, and the fixed column 174 ends the plugging with the circular groove 19. Then the baffle 15 is opened, and the moisture-absorbing bag 20 is placed in the placement groove 14. At the same time, the moisture-absorbing bag 20 is pressed. The moisture-absorbing bag 20 is pressed against the spring plate 164, and the spring plate 164 drives the movable column 163 to slide inside the built-in hole 161. The movable column 163 is pressed against the first return spring 162, and the first return spring 162 is compressed. Then the baffle 15 is closed, and the push block 176 is released at the same time. The second return spring 172 is reset, and the movable block 173 rebounds to drive the fixed column 174 to pop out. The fixed column 174 is plugged and fixed to the circular groove 19 to complete the installation of the moisture-absorbing bag 20.

[0028] See also Figure 7 The pop-up assembly 16 includes a built-in hole 161, a first return spring 162, a moving column 163 and a spring plate 164. The bottom end of the placement groove 14 is symmetrically provided with a built-in hole 161, one end of the built-in hole 161 is fixedly connected to the first return spring 162, and the other end of the first return spring 162 is fixedly connected to the moving column 163. The moving column 163 is slidably connected to the built-in hole 161, and the end of the moving column 163 away from the first return spring 162 is fixedly connected to the spring plate 164, and the end of the spring plate 164 away from the moving column 163 is in contact with the bottom end of the moisture absorbent bag 20. After the baffle 15 is opened by the fixing assembly 17, the first return spring 162 is reset, and the moving column 163 rebounds to drive the spring plate 164 to pop out, and the spring plate 164 pushes the upper moisture absorbent bag 20 out of the placement groove 14, and then the moisture absorbent bag 20 is lifted up and taken out from the placement groove 14, completing the disassembly of the moisture absorbent bag 20.

[0029] See also Figure 8The connecting assembly 28 includes a cavity 281, a third return spring 282, a movable plate 283 and a locking block 284. The connecting block 26 has a cavity 281 inside. One end of the cavity 281 is fixedly connected to the third return spring 282. The other end of the third return spring 282 is fixedly connected to the movable plate 283. The movable plate 283 is slidably connected to the cavity 281. The end of the movable plate 283 away from the third return spring 282 is fixedly connected to the locking block 284. The end of the locking block 284 away from the movable plate 283 is fixedly connected to the locking block 284. The end of the locking block 284 away from the protective shell 4 is set as an inclined surface. The end of the fixed plate 13 close to the protective shell 4 is symmetrically provided with a connecting groove 27. The connecting groove 27 is plug-in connected to the connecting block 26. A locking groove 29 is provided inside the connecting groove 27. The locking groove 29 is snap-connected to the locking block 284. The fixed plate 13 close to the protective shell 4 is The end chamfers are symmetrically fixedly connected with positioning columns 24, and positioning grooves 25 are symmetrically opened at both ends of the protective shell 4. The positioning grooves 25 and the positioning columns 24 are plugged in. The filter bin 12 is inserted into the installation groove 10 of the protective shell 4, so that the filter bin 12 is plugged into the installation groove 10, and the fixing plate 13 fits the protective shell 4. At the same time, the connecting block 26 is inserted into the connecting groove 27, and the positioning column 24 is inserted into the positioning groove 25. During the insertion process, the extrusion force exerts pressure on the inclined surface of one end of the locking block 284, so that the locking block 284 drives the moving plate 283 to compress the third reset spring 282, and the locking block 284 retracts into the cavity 281. Then, when the locking block 284 moves to the locking groove 29, the third reset spring 282 is reset, and the moving plate 283 rebounds to drive the locking block 284 to pop out, and the locking block 284 is clamped and fixed with the locking groove 29 to complete the installation of the filter bin 12.

[0030] See also Figure 8 The locking groove 29 is internally provided with an unlocking block 30 which is slidably connected thereto. One end of the unlocking block 30 which is away from the locking block 284 extends out of the side end of the fixed plate 13. The two ends of the unlocking block 30 are symmetrically fixedly connected with the limiting blocks 31. The two ends of the locking groove 29 are symmetrically provided with limiting grooves 32. The limiting grooves 32 and the limiting blocks 31 are slidably connected. The unlocking block 30 is pushed so that the unlocking block 30 slides inside the locking groove 29. At the same time, the limiting block 31 slides inside the limiting groove 32. The unlocking block 30 pushes the locking block 284 so that the locking block 284 drives the moving plate 283 to compress the third return spring 282. The locking block 284 retracts into the cavity 281. The locking block 284 ends the engagement with the locking groove 29. Then, the filter bin 12 is pulled outward. The filter bin 12 ends the engagement with the mounting groove 10. The positioning column 24 ends the engagement with the positioning groove 25. The disassembly of the filter bin 12 is completed.

[0031] See also Figure 1-Figure 3, a concave block 3 is symmetrically fixedly connected to one end of the mounting plate 1 close to the protective shell 4, and a fixing block 5 is symmetrically fixedly connected to the upper and lower ends of the protective shell 4, and the fixing block 5 is slidingly connected to the concave block 3, and the fixing block 5 and the concave block 3 are fixed by a fixing bolt 6, and a knob 7 is fixedly connected to the upper end of the fixing bolt 6. The fixing blocks 5 at the upper and lower ends of the protective shell 4 are aligned with the concave block 3 on the mounting plate 1, and the protective shell 4 is pushed so that the fixing block 5 is slidingly connected to the concave block 3, and then the knob 7 is turned so that the fixing bolt 6 is threaded downward to the fixing block 5 and the concave block 3 to complete the installation of the protective shell 4.

[0032] See also Figure 4 A fixing groove 33 is provided at one end of the filter compartment 12 away from the cooling fan 22, and a fixing frame 34 is magnetically connected inside the fixing groove 33, and a filter net 35 is fixedly connected inside the fixing frame 34. The fixing frame 34 is pulled outward to terminate the magnetic connection between the fixing frame 34 and the fixing groove 33, and then the filter net 35 in the fixing frame 34 is cleaned. After cleaning, the fixing frame 34 is merged with the installation groove 10 to make the fixing frame 34 and the installation groove 10 magnetically connected to complete the maintenance of the filter net 35.

[0033] The working principle of the present invention is as follows: first, push the push block 176 to make the slider 175 slide inside the slide groove 18, the slider 175 drives the moving block 173 and the fixed column 174 to move, the fixed column 174 retracts into the accommodating chamber 171, the fixed column 174 and the circular groove 19 are plugged in, then the baffle 15 is opened, the moisture-absorbing bag 20 is placed in the placement groove 14, and the moisture-absorbing bag 20 is pressed at the same time, so that the moisture-absorbing bag 20 is pressed against the spring plate 164, and the spring plate 164 drives the moving column 163 to slide inside the built-in hole 161, and the moving column 163 is moved. The column 163 presses against the first return spring 162, the first return spring 162 is compressed, and then the baffle 15 is closed, and the push block 176 is released at the same time, the second return spring 172 is reset, and the moving block 173 rebounds to drive the fixed column 174 to pop out, and the fixed column 174 is plugged and fixed with the circular groove 19 to complete the installation of the moisture absorption bag 20, and then the filter bin 12 is inserted into the installation groove 10 of the protective shell 4, so that the filter bin 12 and the installation groove 10 are plugged, and the fixing plate 13 is fitted with the protective shell 4, and the connecting block 26 is inserted into the connecting groove 2 7, the positioning column 24 is inserted into the positioning groove 25. During the insertion process, the extrusion force applies pressure to the inclined surface of one end of the locking block 284, so that the locking block 284 drives the moving plate 283 to compress the third return spring 282, and the locking block 284 retracts into the cavity 281. Then, when the locking block 284 moves to the locking groove 29, the third return spring 282 is reset, and the moving plate 283 rebounds to drive the locking block 284 to pop out. The locking block 284 is fixed with the locking groove 29 to complete the installation of the filter bin 12. When the liquid level sensor body 8 is working, the cooling fan 22 is started and controlled to rotate forward and reversely. The cooling fan 22 on one side blows the external air into the protective shell 4. The blown air is first filtered through the filter 35 and then filtered through the moisture absorbing bag 20. The filtered air enters the protective shell 4 through the heat dissipation hole 11 to dissipate the heat of the liquid level sensor. At the same time, the cooling fan 22 on the other side blows out the heat inside the protective shell 4 to complete the heat dissipation inside the protective shell 4.

[0034] The present invention can effectively reduce the internal temperature of the sensor, ensuring that it works within the normal temperature range, thereby improving its stability and reliability, and can effectively absorb moisture in the air, reduce humidity corrosion and damage to internal components of the sensor, further ensuring the stable operation of the sensor, and at the same time can reduce ambient humidity, avoid electrical failures caused by moisture, thereby reducing sensor failures caused by humidity and further extending its service life.

Claims

1. A high temperature resistant photoelectric liquid level sensor, characterized in that: The protective shell has a bottom end and a bottom end, and a stopper is movably connected to the bottom end of the protective shell, and a liquid level sensor body is fixedly connected to the bottom end of the liquid level sensor body, and a liquid level sensor probe is symmetrically installed at the bottom end of the liquid level sensor body, and the end of the liquid level sensor probe away from the liquid level sensor body extends out of the bottom end of the protective shell, and mounting grooves are symmetrically provided at both ends of the protective shell, and a filter bin is inserted into the mounting groove, and a fixing plate is fixedly connected to the outside of the filter bin, and a placement groove is provided at the upper end of the filter bin, and a baffle is rotatably connected to one end of the placement groove, and a fixing component is installed inside the baffle, and a pop-up component is installed at the bottom end of the placement groove, and a moisture-absorbing bag is placed inside the placement groove, and a through hole is symmetrically provided at one end of the placement groove close to the protective shell, and a cooling fan is electrically connected to the through hole, and a blocking net is movably connected to the other end of the through hole, and connecting blocks are symmetrically fixedly connected to both ends of the protective shell, and connecting components are symmetrically installed inside the connecting block; The fixing assembly includes a accommodating chamber, a second return spring, a moving block, a fixed column, a sliding block and a pushing block, the baffle is provided with a accommodating chamber inside, one end of the accommodating chamber is fixedly connected to the second return spring, the other end of the second return spring is fixedly connected to the moving block, the moving block and the accommodating chamber are slidably connected, the end of the moving block away from the second return spring is fixedly connected to the fixing column, the end of the fixing column away from the moving block extends out of the side end of the baffle, the upper end of the moving block is fixedly connected to the sliding block, and the end of the sliding block away from the moving block extends out of the upper end of the baffle and is fixedly connected to the pushing block.

2. A high temperature resistant photoelectric liquid level sensor according to claim 1, characterized in that: A sliding groove is provided on the upper end of the baffle, the sliding groove is slidably connected to the accommodating cavity, and the sliding groove is slidably connected to the sliding block.

3. A high temperature resistant photoelectric liquid level sensor according to claim 1, characterized in that: A circular groove is provided at one end of the placement groove close to the baffle, and the circular groove is plugged with the fixing column.

4. A high temperature resistant photoelectric liquid level sensor according to claim 1, characterized in that: The pop-up assembly includes a built-in hole, a first return spring, a moving column and a spring plate, the bottom end of the placement slot is symmetrically provided with built-in holes, one end of the built-in hole is fixedly connected to the first return spring, the other end of the first return spring is fixedly connected to the moving column, the moving column is slidably connected to the built-in hole, one end of the moving column away from the first return spring is fixedly connected to the spring plate, and one end of the spring plate away from the moving column is in contact with the bottom end of the moisture-absorbing bag.

5. The high temperature resistant photoelectric liquid level sensor according to claim 1, characterized in that: The connecting assembly includes a cavity, a third return spring, a movable plate and a locking block. A cavity is opened inside the connecting block, one end of the cavity is fixedly connected to the third return spring, the other end of the third return spring is fixedly connected to the movable plate, the movable plate and the cavity are slidably connected, the end of the movable plate away from the third return spring is fixedly connected to the locking block, the end of the locking block away from the movable plate is fixedly connected to the locking block, and the end of the locking block away from the protective shell is set as an inclined surface.

6. A high temperature resistant photoelectric liquid level sensor according to claim 1, characterized in that: The fixing plate is symmetrically provided with a connecting groove at one end close to the protective shell, the connecting groove and the connecting block are plug-connected, a locking groove is provided inside the connecting groove, and the locking groove and the locking block are snap-connected.

7. The high temperature resistant photoelectric liquid level sensor according to claim 1, characterized in that: An unlocking block is slidably connected inside the locking groove, and one end of the unlocking block extends out of the side end of the fixed plate away from the locking block. Both ends of the unlocking block are symmetrically fixedly connected to limiting blocks. Limiting grooves are symmetrically provided at both ends of the locking groove, and the limiting grooves and the limiting blocks are slidably connected.

8. The high temperature resistant photoelectric liquid level sensor according to claim 1, characterized in that: The fixing plate is symmetrically fixedly connected with positioning posts at the chamfered corner of one end close to the protective shell, and positioning grooves are symmetrically opened at both ends of the protective shell, and the positioning grooves are plug-connected with the positioning posts.

9. The high temperature resistant photoelectric liquid level sensor according to claim 1, characterized in that: A concave block is symmetrically fixedly connected to one end of the mounting plate close to the protective shell, and fixed blocks are symmetrically fixedly connected to the upper and lower ends of the protective shell. The fixed block and the concave block are slidably connected, and the fixed block and the concave block are fixed by a fixing bolt, and a knob is fixedly connected to the upper end of the fixing bolt.

10. The high temperature resistant photoelectric liquid level sensor according to claim 1, characterized in that: A fixing groove is provided at one end of the filter bin away from the heat dissipation fan, a fixing frame is magnetically connected inside the fixing groove, and a filter is fixedly connected inside the fixing frame.

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