Semiconductor propane sensor with novel filter

Abstract

The invention relates to the technical field of propane sensors, in particular to a semiconductor propane sensor with a novel filter, which comprises a shell, a supporting net is fixedly connected in the shell, a first silk screen is slidably connected to the upper end of the shell, a cleaning mechanism is arranged at the lower end of the first silk screen, and the cleaning mechanism comprises an ejector pin. A clamping mechanism is arranged at the upper end of the supporting net, a second silk screen is fixedly connected into the shell, sponge is fixedly connected to the upper end of the second silk screen, an extrusion mechanism is arranged at the upper end of the second silk screen, and a shaking mechanism is arranged at the lower end of the second silk screen. When the first silk screen is pressed into the shell for the first time, the ejector pin blocks the hole of the first silk screen all the time and cleans the interior of the hole, when the first silk screen is pressed into the shell again, the ejector pin is far away from the first silk screen, and when the first silk screen is pressed into the shell, the first silk screen extrudes the sponge. And meanwhile, the activated carbon pills in the cage body can be driven to slightly shake.

Description

Technical Field

[0001] The invention relates to the technical field of propane sensors, in particular to a semiconductor propane sensor with a novel filter. Background Art

[0002] A semiconductor propane sensor is a gas sensor based on semiconductor gas-sensitive materials. It uses the property that the electrical conductivity of semiconductor materials (such as tin oxide) changes when they come into contact with reducing gases such as propane to detect gas concentration. The semiconductor propane sensor with a new filter adds a filter with special functions to the traditional semiconductor propane sensor to improve the sensor's selectivity, accuracy and stability. This filter can effectively filter out interfering gases and impurities, ensuring that the sensor can more accurately detect propane gas concentration.

[0003] When using semiconductor propane sensors in the existing technology, some designs only use a single layer of filter material, which may not be able to effectively intercept tiny particles or filter impurities of different particle sizes in layers. This reduces the filtration efficiency and increases the risk of sensor failure. When the semiconductor propane sensor is not in use, external air will directly enter the semiconductor propane sensor. The semiconductor sensor is sensitive to environmental humidity and temperature. The entry of air may change the internal humidity of the sensor, causing the baseline resistance value to drift and causing measurement data errors. Long-term exposure may also cause dust or volatile organic compounds (VOCs) to be adsorbed on the sensor surface, further reducing sensitivity. Oxygen, water vapor or acidic gases in the air may chemically react with sensor materials (such as tin oxide), causing component corrosion. In a high humidity environment, water vapor may accelerate component aging and shorten the sensor life. The activated carbon pills in the semiconductor propane sensor may agglomerate due to the adsorption of impurities or humidity changes when in a long-term static state, causing pore blockage. Summary of the Invention

[0004] In view of the problems in the prior art, the present invention provides a semiconductor propane sensor with a novel filter.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a semiconductor propane sensor with a new filter, comprising a shell, a support net fixedly connected to the inside of the shell, a first wire mesh slidably connected to the upper end of the shell, a cage fixedly connected to the inner surface of the shell, a mechanism for clearing and cleaning the mesh of the first wire mesh is provided at the lower end of the first wire mesh, the cleaning mechanism comprises a ejector pin, a locking mechanism for blocking the ejector pin in the first wire mesh is provided at the upper end of the support net, a second wire mesh fixedly connected to the inside of the shell, a sponge fixedly connected to the upper end of the second wire mesh, a squeezing mechanism for squeezing the sponge is provided at the upper end of the second wire mesh, and a shaking mechanism for slightly shaking the activated carbon pills is provided at the lower end of the second wire mesh.

[0006] Preferably, the cleaning mechanism includes a movable plate, one end of the movable plate is fixedly connected to the first screen, the lower end of the movable plate is fixedly connected to a sliding rod, the surface of the sliding rod is slidably connected to the second screen, and the upper end of the second screen is fixedly connected to a pin.

[0007] Preferably, the cleaning mechanism further comprises a spring, the lower end of the movable plate is fixedly connected to the spring, and the lower end of the spring is fixedly connected to the second wire mesh.

[0008] Preferably, the engaging mechanism includes an elastic rod, the upper end of the elastic rod is fixedly connected to the first wire mesh, and the surface of the elastic rod is slidably connected to the second wire mesh.

[0009] Preferably, the locking mechanism also includes a fixing plate, the upper end of the support net is fixedly connected to the fixing plate, a first sliding groove is opened inside the fixing plate, a second sliding groove is also opened inside the fixing plate, and the lower end of the fixing plate is fixedly connected to the support net.

[0010] Preferably, the squeezing mechanism includes a waterproof cloth, and the upper end of the waterproof cloth is fixedly connected to the movable plate.

[0011] Preferably, the shaking mechanism includes a first fixed block, the lower end of which is fixedly connected to the cage body, and the lower end of the sliding rod is fixedly connected to a second fixed block.

[0012] Beneficial effects of the present invention: (1) The semiconductor propane sensor with a novel filter described in the present invention has several ejector pins, which can enter the holes of the first wire mesh when the first wire mesh is pressed downward. The ejector pins can clean the dust and impurities in the holes of the first wire mesh, thereby improving the detection quality of the semiconductor propane sensor.

[0013] (2) The semiconductor propane sensor with a novel filter described in the present invention adopts a structure in which, when the first screen is pressed into the housing for the first time, the ejector pin will always block the holes of the first screen, so that outside air and dust impurities will not enter the interior of the sensor when the semiconductor propane sensor is not in use. When the first screen is pressed into the housing again, the ejector pin will be away from the first screen, so that the semiconductor propane sensor can work normally.

[0014] (3) The semiconductor propane sensor with a novel filter described in the present invention can absorb water vapor through the sponge provided on the upper end of the second wire mesh. When the first wire mesh is pressed into the housing, the first wire mesh squeezes the sponge to discharge the water vapor adsorbed inside the sponge.

[0015] (4) The semiconductor propane sensor with a novel filter described in the present invention has a first fixed block provided at the upper end of the cage body. While pressing the first screen into the shell, it also drives the second fixed block to move downward. The downward movement of the second fixed block and the friction with the first fixed block produce slight vibrations, which cause the activated carbon pills in the cage body to shake slightly. The activated carbon pills may agglomerate due to adsorption of impurities or humidity changes in a long-term static state, resulting in pore blockage. Slight vibrations can break the electrostatic force or van der Waals force between the particles through mechanical disturbance, maintain pore permeability, and extend the adsorption life of the activated carbon. Low-frequency vibrations (such as <100Hz) can accelerate the shedding of impurities such as dust and oil on the surface of the activated carbon, reducing the need for manual maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and examples.

[0017] Figure 1 A schematic diagram of the overall structure provided by the present invention; Figure 2 It is a cross-sectional view of the overall structure; Figure 3 Schematic diagram of the connection structure between the housing and the first wire mesh; Figure 4 Schematic diagram of the connection structure between the cage and the support net; Figure 5 for Figure 4 The enlarged structural diagram of part A is shown; Figure 6 Schematic diagram of the fixed plate structure.

[0018] In the figure: 100, shell; 101, cage; 102, support net; 200, first wire mesh; 300, cleaning mechanism; 301, movable plate; 302, sliding rod; 303, second wire mesh; 304, ejector pin; 305, spring; 400, locking mechanism; 401, elastic rod; 402, fixing plate; 4021, first slide groove; 4022, second slide groove; 500, squeezing mechanism; 501, waterproof cloth; 502, sponge; 600, shaking mechanism; 601, first fixed block; 602, second fixed block. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0020] like Figures 1-6As shown, a semiconductor propane sensor with a novel filter according to the present invention includes a shell 100, a support net 102 is fixedly connected to the inside of the shell 100, a first wire mesh 200 is slidably connected to the upper end of the shell 100, and a cage 101 is fixedly connected to the inner surface of the shell 100. The lower end of the first wire mesh 200 is provided with a cleaning mechanism 300 for clearing the mesh of the first wire mesh 200, and the cleaning mechanism 300 includes a ejector pin 304, and the upper end of the support net 102 is provided with a snap-fit ​​mechanism 400 for blocking the ejector pin 304 in the first wire mesh 200. A second wire mesh 303 is fixedly connected to the inside of the shell 100, a sponge 502 is fixedly connected to the upper end of the second wire mesh 303, a squeezing mechanism 500 for squeezing the sponge 502 is provided at the upper end of the second wire mesh 303, and a shaking mechanism 600 for slightly shaking the activated carbon pills is provided at the lower end of the second wire mesh 303.

[0021] Specifically, the cleaning mechanism 300 includes a movable plate 301, one end of the movable plate 301 is fixedly connected to the first screen 200, the lower end of the movable plate 301 is fixedly connected to a sliding rod 302, the surface of the sliding rod 302 is slidably connected to the second screen 303, the upper end of the second screen 303 is fixedly connected to a ejector pin 304, the lower end of the movable plate 301 is fixedly connected to a spring 305, the lower end of the spring 305 is fixedly connected to the second screen 303; by pressing the first screen 200 downward to enter the housing 100, the first screen 20 0 moves downward, driving the movable plate 301 to move downward. The downward movement of the movable plate 301 drives the holes of the first screen 200 to fit into the ejector pins 304. At this time, the ejector pins 304 clean the inside of the first screen 200 and block the holes of the first screen 200. By setting a plurality of ejector pins 304, when the first screen 200 is pressed downward, the ejector pins 304 enter the holes of the first screen 200. The ejector pins 304 entering the holes of the first screen 200 can clean the dust and impurities in the holes, thereby improving the detection quality of the semiconductor propane sensor.

[0022] In addition, the locking mechanism 400 includes an elastic rod 401, the upper end of the elastic rod 401 is fixedly connected to the first wire mesh 200, the surface of the elastic rod 401 is slidably connected to the second wire mesh 303, the upper end of the support mesh 102 is fixedly connected to a fixing plate 402, the interior of the fixing plate 402 is provided with a first sliding groove 4021, the interior of the fixing plate 402 is also provided with a second sliding groove 4022, and the lower end of the fixing plate 402 is fixedly connected to the support mesh 102; when the first wire mesh 200 is pressed downward, the elastic rod 401 is driven to move downward, and the elastic rod 401 is pressed downward. The force rod 401 is made of spring steel and has a certain elasticity. In the initial state, the end of the elastic rod 401 close to the fixed plate 402 is slidably connected to the first slide groove 4021. With the position of the elastic rod 401 as the upper end, the depth of the first slide groove 4021 gradually increases from top to bottom, and the depth of the second slide groove 4022 gradually decreases from top to bottom. The lower ends of the first slide groove 4021 and the second slide groove 4022 are both in an arc shape that opens upward. The arc shape of the first slide groove 4021 is larger than that of the second slide groove 4022. The elastic rod 401 initially moves downward at the upper end of the first slide groove 4021. Under the influence of the spring 305 Under the action of the reset elastic force, the lower end of the elastic rod 401 will slide to the arc-shaped connection between the first slide groove 4021 and the lower end of the second slide groove 4022. At this time, the ejector pin 304 will block the holes of the first screen 200 to achieve sealing of the first screen 200. This can prevent outside air from entering the semiconductor propane sensor when the semiconductor propane sensor is not in use, and can also prevent dust and impurities from adhering to the holes of the first screen 200. Pressing the first screen 200 again will drive the lower end of the elastic rod 401 to slide at the arc-shaped connection between the first slide groove 4021 and the lower end of the second slide groove 4022. When the first screen 200 is pressed into the housing 100 for the first time, the ejector pin 304 will keep the holes of the first screen 200 blocked. When the first screen 200 is pressed into the housing 100 again, the ejector pin 304 will be away from the first screen 200, so that the semiconductor propane sensor can work normally.

[0023] Furthermore, the squeezing mechanism 500 includes a waterproof cloth 501, and the upper end of the waterproof cloth 501 is fixedly connected to the movable plate 301; when the first wire mesh 200 is pressed into the shell 100, the movable plate 301 will be driven to move downward, and the downward movement of the movable plate 301 will drive the waterproof cloth 501 to move downward. When the first wire mesh 200 moves downward, the sponge 502 will be squeezed to discharge the water vapor adsorbed inside the sponge 502. Since the first wire mesh 200 of the semiconductor propane sensor is downward during operation, the squeezed water is discharged through the first wire mesh 200. It is discharged by pressing twice in succession. The sponge 502 set at the upper end of the second wire mesh 303 can absorb water vapor. When the first wire mesh 200 is pressed into the shell 100, the first wire mesh 200 will squeeze the sponge 502 to discharge the water vapor adsorbed inside the sponge 502.

[0024] It should be noted that the shaking mechanism 600 includes a first fixed block 601, the lower end of the first fixed block 601 is fixedly connected to the cage body 101, and the lower end of the sliding rod 302 is fixedly connected to the second fixed block 602; when the second screen 303 moves downward, it will also drive the second fixed block 602 to move downward, and the downward moving surface of the second fixed block 602 is provided with a plurality of arc-shaped protrusions, and the upper end of the cage body 101 is fixedly provided with a corresponding first fixed block 601. When the second fixed block 602 moves downward, it will slide with the protrusions on the first fixed block 601 to generate slight vibration, which is limited to a low frequency range (such as <100Hz) and adopts intermittent vibration; by setting the first fixed block 601 at the upper end of the cage body 101, when the first screen 200 is pressed into the shell 100, it will also drive the second fixed block 602 to move downward, and the second fixed block 602 moves downward and rubs against the first fixed block 601 to generate slight vibration.

[0025] Working principle: When the present invention is in use, the first wire mesh 200 is away from the ejector pin 304, and the sensor is arranged in the housing 100 away from the first wire mesh 200. The sensor base is made of nickel-plated steel, and the housing 100 is made of stainless steel. The semiconductor gas sensor using tin oxide reflects the change in resistance value R by the change of [O-] on the surface of tin oxide particles. Once the tin oxide particles are placed in the air and heated to hundreds of degrees, they are exposed to a reducing gas such as carbon monoxide. The oxygen adsorbed on the surface reacts with the gas, causing [O-] to decrease. As a result, [e]S increases and R decreases. After the reducing gas is eliminated, [O-] increases to the concentration before exposure to the gas, and R will also return to the size before exposure to the gas. The semiconductor gas sensor using tin oxide utilizes this property to detect gas.

[0026] The gas to be detected enters the internal filtration area of ​​the shell 100 through the first wire mesh 200. The gas to be detected can filter out some water vapor through the sponge 502. At this time, the gas continues to pass through the second wire mesh 303. The gas passing through the second wire mesh 303 passes through the cage 101 and the activated carbon pill layer to filter out interfering gases, ethanol, methane, etc., so that propane can pass through the filter to reach the sensor. There are many small holes on both sides of the cage 101. The gas passing through the activated carbon pill layer passes through the support net 102 and enters the detection area in the shell 100. The support net 102 also has many small holes. The gas to be detected reaches the detection area after multiple filtrations.

[0027] When the semiconductor propane sensor needs to be cleaned, the first screen 200 of the semiconductor propane sensor is turned downward. Activated carbon pills are installed inside the cage 101. The activated carbon pills in the cage 101 are coal-based activated carbon. Due to its high carbon content and developed pore structure, it has natural mechanical strength advantages. Carboxymethyl starch is used instead of traditional coal tar binder, which can increase the wear resistance of activated carbon to 95.3% to 97.1%, significantly reducing the breakage rate under vibration. Carboxymethyl starch binder forms a colloidal substance during the carbonization process, which enhances the adhesion between coal particles and thus improves wear resistance. By pressing the first screen 200 downward to enter the shell 100, the downward movement of the first screen 200 drives the active The plate 301 moves downward, and the downward movement of the movable plate 301 will drive the holes of the first wire mesh 200 to fit with the ejector pins 304. The number of holes in the first wire mesh 200 is the same as the number of ejector pins 304, and the holes of the first wire mesh 200 correspond to the ejector pins 304. At this time, the ejector pins 304 will clean the inside of the first wire mesh 200, and the ejector pins 304 will block the holes of the first wire mesh 200. By setting up several ejector pins 304, when the first wire mesh 200 is pressed downward, the ejector pins 304 will enter the holes of the first wire mesh 200. The ejector pins 304 entering the holes of the first wire mesh 200 can clean the dust and impurities in the holes, thereby improving the detection quality of the semiconductor propane sensor.

[0028] When the first screen 200 is pressed downward, the elastic rod 401 will be driven to move downward. The elastic rod 401 is made of spring steel and has a certain elasticity. In the initial state, the end of the elastic rod 401 close to the fixed plate 402 is slidably connected to the first slide groove 4021. With the position of the elastic rod 401 as the upper end, the depth of the first slide groove 4021 gradually increases from top to bottom, and the depth of the second slide groove 4022 gradually decreases from top to bottom. The lower ends of the first slide groove 4021 and the second slide groove 4022 are both upward. The arc of the opening, the arc of the first slide 4021 is larger than the arc of the second slide 4022, the elastic rod 401 initially moves downward at the upper end of the first slide 4021, and the lower end of the elastic rod 401 is driven by the reset elastic force of the spring 305 to slide to the connection between the first slide 4021 and the lower end of the second slide 4022. At this time, the ejector pin 304 will block the hole of the first screen 200, thereby sealing the first screen 200. In this way, the semiconductor propane sensor can be When in use, external air is prevented from entering the semiconductor propane sensor, and dust and impurities are prevented from adhering to the holes of the first screen 200. Pressing the first screen 200 again will drive the lower end of the elastic rod 401 to slide to the second slide groove 4022 at the arc-shaped connection between the first slide groove 4021 and the lower end of the second slide groove 4022. When the elastic rod 401 slides to the second slide groove 4022, it will slide to the upper end of the first slide groove 4021 under the action of the return elastic force of the spring 305. At this time, the first screen 200 is away from the ejector pin 304, and the semiconductor propane sensor can work normally. With the structure set, when the first screen 200 is pressed into the shell 100 for the first time, the ejector pin 304 will always block the holes of the first screen 200, so that external air and dust and impurities will not enter the sensor when the semiconductor propane sensor is not in use. When the first screen 200 is pressed into the shell 100 again, the ejector pin 304 will be away from the first screen 200, so that the semiconductor propane sensor can work normally.

[0029] When the first screen 200 is pressed into the housing 100, the movable plate 301 is driven to move downward, and the movable plate 301 is driven to move downward at the same time. When the first screen 200 moves downward, the sponge 502 is squeezed to discharge the water vapor adsorbed inside the sponge 502. Since the first screen 200 of the semiconductor propane sensor is downward during operation, the squeezed water is discharged through the first screen 200. Pressing twice continuously to discharge the water is arranged between the second screen 303 and the movable plate 301. The waterproof cloth 501 is used to prevent the water squeezed by the sponge 502 from flowing to other places in the shell 100. A waterproof cloth 501 is also provided between the movable plate 301 and the shell 100 to prevent water and dust. The waterproof cloth 501 is made of Oxford cloth. The waterproof cloth 501 is wrinkled and can be pulled. The sponge 502 set at the upper end of the second wire mesh 303 can absorb water vapor. When the first wire mesh 200 is pressed into the shell 100, the first wire mesh 200 will squeeze the sponge 502 to discharge the water vapor adsorbed inside the sponge 502.

[0030] When the second screen 303 moves downward, it will also drive the second fixed block 602 to move downward. The surface of the second fixed block 602 moving downward is provided with a plurality of arc-shaped protrusions. The upper end of the cage 101 is fixed with a corresponding first fixed block 601. When the second fixed block 602 moves downward, it will slide with the protrusions on the first fixed block 601 to generate slight vibrations. The slight vibration of the protrusions on the first fixed block 601 will drive the cage 101 to shake slightly. The slight shaking of the cage 101 will drive the activated carbon pills inside to shake slightly, which is limited to a low frequency range (such as <100Hz) and adopts intermittent vibration. By setting the first fixed block 601 at the upper end of the cage 101, when the first screen 2 00 is pressed into the shell 100, and at the same time, the second fixed block 602 is driven to move downward. The downward movement of the second fixed block 602 and the friction with the first fixed block 601 produce slight vibrations, which make the activated carbon pills in the cage shake slightly. The activated carbon pills may agglomerate due to the adsorption of impurities or humidity changes in a long-term static state, resulting in pore blockage. Slight vibrations can break the electrostatic force or van der Waals force between the particles through mechanical disturbance, maintain pore permeability, and extend the adsorption life of the activated carbon. Low-frequency vibrations (such as <100Hz) can accelerate the shedding of impurities such as dust and oil on the surface of the activated carbon, reducing the need for manual maintenance. By maintaining pore permeability, vibration may delay the performance degradation of the activated carbon due to adsorption saturation or chemical aging.

[0031] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A semiconductor propane sensor with a novel filter, comprising a housing (100), wherein a support net (102) is fixedly connected to the interior of the housing (100), characterized in that: The upper end of the shell (100) is slidably connected to a first wire mesh (200), the inner surface of the shell (100) is fixedly connected to a cage (101), the lower end of the first wire mesh (200) is provided with a cleaning mechanism (300) for clearing the mesh of the first wire mesh (200), the cleaning mechanism (300) includes a ejector pin (304), the upper end of the support net (102) is provided with a snap-fit ​​mechanism (400) for blocking the ejector pin (304) in the first wire mesh (200), the interior of the shell (100) is fixedly connected to a second wire mesh (303), the upper end of the second wire mesh (303) is fixedly connected to a sponge (502), the upper end of the second wire mesh (303) is provided with a squeezing mechanism (500) for squeezing the sponge (502), and the lower end of the second wire mesh (303) is provided with a shaking mechanism (600) for slightly shaking the activated carbon pills.

2. The semiconductor propane sensor with a novel filter according to claim 1, characterized in that: The cleaning mechanism (300) includes a movable plate (301), one end of the movable plate (301) is fixedly connected to the first screen (200), the lower end of the movable plate (301) is fixedly connected to a sliding rod (302), the surface of the sliding rod (302) is slidably connected to a second screen (303), and the upper end of the second screen (303) is fixedly connected to a thimble (304).

3. The semiconductor propane sensor with a novel filter according to claim 2, characterized in that: The cleaning mechanism (300) further comprises a spring (305), the lower end of the movable plate (301) is fixedly connected to the spring (305), and the lower end of the spring (305) is fixedly connected to the second screen (303).

4. The semiconductor propane sensor with a novel filter according to claim 3, characterized in that: The locking mechanism (400) comprises an elastic rod (401), the upper end of the elastic rod (401) is fixedly connected to the first wire mesh (200), and the surface of the elastic rod (401) is slidably connected to the second wire mesh (303).

5. The semiconductor propane sensor with a novel filter according to claim 4, characterized in that: The locking mechanism (400) further comprises a fixing plate (402), the upper end of the support net (102) being fixedly connected to the fixing plate (402), a first sliding groove (4021) being provided inside the fixing plate (402), a second sliding groove (4022) being provided inside the fixing plate (402), and a lower end of the fixing plate (402) being fixedly connected to the support net (102).

6. The semiconductor propane sensor with a novel filter according to claim 5, characterized in that: The squeezing mechanism (500) comprises a waterproof cloth (501), the upper end of the waterproof cloth (501) being fixedly connected to the movable plate (301).

7. The semiconductor propane sensor with a novel filter according to claim 6, characterized in that: The shaking mechanism (600) comprises a first fixed block (601), the lower end of the first fixed block (601) is fixedly connected to the cage body (101), and the lower end of the sliding rod (302) is fixedly connected to a second fixed block (602).

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