Semiconductor propane sensor with novel filter

Abstract

The application 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 wire mesh is slidably connected to the upper end of the shell, a cleaning mechanism is arranged at the lower end of the first wire mesh, the cleaning mechanism comprises a thimble, a clamping mechanism is arranged at the upper end of the supporting net, a second wire mesh is fixedly connected in the shell, a sponge is fixedly connected to the upper end of the second wire mesh, an extrusion mechanism is arranged at the upper end of the second wire mesh, and a shaking mechanism is arranged at the lower end of the second wire mesh; when the first wire mesh is pressed into the shell for the first time, the thimble will always block the holes of the first wire mesh and clean the holes; when the first wire mesh is pressed into the shell for the second time, the thimble will be away from the first wire mesh; when the first wire mesh is pressed into the shell, the first wire mesh will extrude the sponge, discharge the water vapor adsorbed in the sponge, and also drive the activated carbon pills in the cage to slightly shake.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of propane sensor, in particular to a semiconductor propane sensor with a new filter. BACKGROUND

[0002] The semiconductor propane sensor is a kind of gas sensor based on semiconductor gas sensitive material, which detects gas concentration by using the characteristic that the conductivity of semiconductor material (such as tin oxide) changes when it contacts with reducing gases such as propane. The semiconductor propane sensor with a new filter improves the selectivity, accuracy and stability of the sensor by adding a filter with special functions on the basis of the traditional semiconductor propane sensor. The filter can effectively filter out interfering gases and impurities, ensuring that the sensor can detect propane gas concentration more accurately.

[0003] The existing semiconductor propane sensor may not effectively intercept small particles or filter impurities of different particle sizes when using a single layer of filter material in some designs, which reduces the filtering efficiency and increases the risk of sensor failure. When the semiconductor propane sensor is not in use, external air can directly enter the interior of the semiconductor propane sensor. The semiconductor sensor is sensitive to environmental humidity and temperature, and the entry of air may change the humidity inside the sensor, causing the baseline resistance value to drift, resulting in measurement data errors. Long-term exposure may also cause the sensor surface to adsorb dust or volatile organic compounds (VOCs), further reducing sensitivity. Oxygen, water vapor or acidic gases in the air may react with the sensor material (such as tin oxide), causing the element to corrode. In a high humidity environment, water vapor may accelerate the aging of the element, shortening the service life of the sensor. The activated carbon pellets in the semiconductor propane sensor may clog due to adsorption of impurities or changes in humidity in a long-term stationary state, causing the pores to be blocked. SUMMARY

[0004] To solve the problems in the prior art, the present application provides a semiconductor propane sensor with a new filter.

[0005] The technical solution adopted by the present application to solve its technical problems is as follows: a semiconductor propane sensor with a new filter, comprising a shell, a support net fixedly connected inside the shell, a first wire mesh slidingly connected to the upper end of the shell, a cage fixedly connected to the inner surface of the shell, a clearing mechanism for the first wire mesh mesh provided at the lower end of the first wire mesh, the clearing mechanism comprising a thimble, a clamping mechanism for blocking the thimble in the first wire mesh 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, an extrusion mechanism for extruding the sponge provided at the upper end of the second wire mesh, and a shaking mechanism for slightly shaking the activated carbon pellets provided at the lower end of the second wire mesh.

[0006] Preferably, the cleaning mechanism comprises a movable plate, one end of the movable plate is fixedly connected with the first screen, the lower end of the movable plate is fixedly connected with a sliding rod, the surface of the sliding rod is slidingly connected with a second screen, and the upper end of the second screen is fixedly connected with a thimble.

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

[0008] Preferably, the clamping mechanism comprises an elastic rod, the upper end of the elastic rod is fixedly connected with the first screen, and the surface of the elastic rod is slidingly connected with the second screen.

[0009] Preferably, the clamping mechanism further comprises a fixed plate, the upper end of the support net is fixedly connected with the fixed plate, the inside of the fixed plate is provided with a first sliding groove, the inside of the fixed plate is further provided with a second sliding groove, and the lower end of the fixed plate is fixedly connected with the support net.

[0010] Preferably, the extrusion mechanism comprises a tarpaulin, and the upper end of the tarpaulin is fixedly connected with the movable plate.

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

[0012] The beneficial effects of the present application are as follows:

[0013] (1) The semiconductor propane sensor with a novel filter, by arranging a plurality of thimbles, when the first screen is pressed downward, the thimbles enter the holes of the first screen, the thimbles can clean the dust and impurities in the holes, and the detection quality of the semiconductor propane sensor is improved.

[0014] (2) The semiconductor propane sensor with a novel filter, by arranging the structure, when the first screen is pressed into the shell for the first time, the thimbles will always block the holes of the first screen, so that when the semiconductor propane sensor is not in use, the external air and dust impurities cannot enter the inside of the sensor, and when the first screen is pressed into the shell again, the thimbles will move away from the first screen, so that the semiconductor propane sensor can work normally.

[0015] (3) The semiconductor propane sensor with a novel filter, by arranging a sponge at the upper end of the second screen, the sponge can adsorb water vapor, when the first screen is pressed into the shell, the first screen will extrude the sponge, and the water vapor adsorbed in the sponge is discharged.

[0016] (4) The semiconductor propane sensor with a new filter, by the first fixed block arranged at the upper end of the cage, the first wire mesh is pressed into the shell, and the second fixed block is also driven to move downward, the second fixed block moves downward and rubs with the first fixed block to generate slight vibration, the activated carbon pills in the cage are slightly shaken, the activated carbon pills may be caked due to adsorption of impurities or humidity change in a long-term stationary state, causing pore blockage, slight vibration can break the electrostatic force or van der waals force between particles through mechanical disturbance, maintain the pore permeability, prolong the adsorption life of activated carbon, low-frequency vibration (such as <100Hz) can accelerate the falling of impurities such as dust and oil stains on the surface of activated carbon, and reduce the demand for manual maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0017] The application is further described below in combination with the drawings and examples.

[0018] Figure 1 The overall structure schematic diagram provided by the application is shown in the figure;

[0019] Figure 2 The overall structure sectional view is shown in the figure;

[0020] Figure 3 The shell and the first wire mesh connection structure schematic diagram is shown in the figure;

[0021] Figure 4 The cage and the support net connection structure schematic diagram is shown in the figure;

[0022] Figure 5 The A part enlarged structure schematic diagram shown in the figure is shown in the figure; Figure 4

[0023] The fixed plate structure schematic diagram is shown in the figure. Figure 6 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, thimble; 305, spring; 400, clamping mechanism; 401, elastic rod; 402, fixed plate; 4021, first sliding groove; 4022, second sliding groove; 500, extrusion mechanism; 501, waterproof cloth; 502, sponge; 600, shaking mechanism; 601, first fixed block; 602, second fixed block.

[0024] DETAILED DESCRIPTION In order to make the technical means, creative features, purposes and effects realized by the application easy to understand, the application is further described below in combination with specific embodiments.

[0025] In order to make the technical means, creative features, purposes and effects realized by the application easy to understand, the application is further described below in combination with specific embodiments.

[0026] As Figures 1-6As shown, the semiconductor propane sensor with a new filter comprises a shell 100, a support net 102 is fixedly connected inside the shell 100, a first wire mesh 200 is slidably connected to the upper end of the shell 100, a cage 101 is fixedly connected to the inner surface of the shell 100, a cleaning mechanism 300 for the mesh holes of the first wire mesh 200 is arranged at the lower end of the first wire mesh 200, the cleaning mechanism 300 comprises a thimble 304, a clamping mechanism 400 for plugging the thimble 304 in the first wire mesh 200 is arranged at the upper end of the support net 102, a second wire mesh 303 is fixedly connected inside 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 arranged at the upper end of the second wire mesh 303, and a shaking mechanism 600 for slightly shaking the activated carbon pills is arranged at the lower end of the second wire mesh 303.

[0027] Specifically, the cleaning mechanism 300 comprises a movable plate 301, one end of the movable plate 301 is fixedly connected with the first wire mesh 200, a sliding rod 302 is fixedly connected to the lower end of the movable plate 301, a second wire mesh 303 is slidably connected to the surface of the sliding rod 302, a thimble 304 is fixedly connected to the upper end of the second wire mesh 303, a spring 305 is fixedly connected to the lower end of the movable plate 301, and the lower end of the spring 305 is fixedly connected with the second wire mesh 303; by pressing the first wire mesh 200 downward into the shell 100, the first wire mesh 200 moves downward to drive the movable plate 301 to move downward, the downward movement of the movable plate 301 drives the holes of the first wire mesh 200 to engage with the thimble 304, at this time the thimble 304 cleans the first wire mesh 200, and the thimble 304 blocks the holes of the first wire mesh 200; by arranging a plurality of thimbles 304, when the first wire mesh 200 is pressed downward, the thimbles 304 enter the holes of the first wire mesh 200, the thimbles 304 entering the holes of the first wire mesh 200 can clean the dust and impurities in the holes, and the detection quality of the semiconductor propane sensor is improved.

[0028] In addition, the clamping mechanism 400 comprises a resilient rod 401, the upper end of the resilient rod 401 is fixedly connected with the first wire mesh 200, the surface of the resilient rod 401 is slidably connected with the second wire mesh 303, the upper end of the support net 102 is fixedly connected with a fixed plate 402, the inside of the fixed plate 402 is provided with a first sliding groove 4021, the inside of the fixed plate 402 is also provided with a second sliding groove 4022, the lower end of the fixed plate 402 is fixedly connected with the support net 102; the resilient rod 401 is moved downward while the first wire mesh 200 is pressed downward, the resilient rod 401 is made of spring steel material and has a certain elasticity, the end of the resilient rod 401 close to the fixed plate 402 in the initial state is slidably connected with the first sliding groove 4021, the position of the resilient rod 401 is taken as the upper end, the depth of the first sliding groove 4021 gradually increases from top to bottom, the depth of the second sliding groove 4022 gradually decreases from top to bottom, the lower end of the first sliding groove 4021 and the lower end of the second sliding groove 4022 are both provided with an upwardly opening arc, the arc of the first sliding groove 4021 is larger than the arc of the second sliding groove 4022, the lower end of the resilient rod 401 is slid to the connection position of the arcs of the lower end of the first sliding groove 4021 and the lower end of the second sliding groove 4022 under the reset elastic force of the spring 305, at this time, the hole of the first wire mesh 200 is blocked by the thimble 304, the first wire mesh 200 is closed, in this way, when the semiconductor propane sensor is not used, the outside air can be prevented from entering the semiconductor propane sensor, and the dust and impurities can also be prevented from adhering to the hole of the first wire mesh 200, the lower end of the resilient rod 401 is slid to the second sliding groove 4022 from the connection position of the arcs of the lower end of the first sliding groove 4021 and the lower end of the second sliding groove 4022 under the reset elastic force of the spring 305, the resilient rod 401 is slid to the upper end of the first sliding groove 4021, at this time, the first wire mesh 200 is away from the thimble 304, at this time, the semiconductor propane sensor can work normally, by adopting the structure, when the first wire mesh 200 is pressed into the shell 100 for the first time, the hole of the first wire mesh 200 is blocked by the thimble 304, when the first wire mesh 200 is pressed into the shell 100 for the second time, the thimble 304 is away from the first wire mesh 200, so that the semiconductor propane sensor can work normally.

[0029] Further, the pressing mechanism 500 comprises a waterproof cloth 501, the upper end of the waterproof cloth 501 is fixedly connected with the movable plate 301; when the first wire mesh 200 is pressed into the shell 100, the movable plate 301 is driven to move downwards, and the waterproof cloth 501 is driven to move downwards at the same time that the movable plate 301 moves downwards, the sponge 502 is pressed when the first wire mesh 200 moves downwards, and water vapor adsorbed in the sponge 502 is discharged, because the first wire mesh 200 of the semiconductor propane sensor is pressed downwards during operation, the pressed-out water is discharged through the first wire mesh 200, and the water vapor can be adsorbed through the sponge 502 arranged at the upper end of the second wire mesh 303, when the first wire mesh 200 is pressed into the shell 100, the first wire mesh 200 presses the sponge 502, and the water vapor adsorbed in the sponge 502 is discharged.

[0030] It should be noted that the shaking mechanism 600 comprises a first fixed block 601, the lower end of the first fixed block 601 is fixedly connected with the cage 101, and the lower end of the sliding rod 302 is fixedly connected with a second fixed block 602; the second fixed block 602 is driven to move downwards at the same time that the second wire mesh 303 moves downwards, the surface of the second fixed block 602 moving downwards is provided with a plurality of arc-shaped protruding blocks, the upper end of the cage 101 is fixedly provided with a corresponding first fixed block 601, and slight vibration is generated when the protruding blocks on the first fixed block 601 slide with the second fixed block 602 moving downwards, the vibration is limited in a low frequency range (such as <100Hz), and intermittent vibration is adopted; through the first fixed block 601 arranged at the upper end of the cage 101, the second fixed block 602 is driven to move downwards at the same time that the first wire mesh 200 is pressed into the shell 100, and slight vibration is generated through mutual friction between the second fixed block 602 moving downwards and the first fixed block 601.

[0031] Working principle: when the first wire mesh 200 is away from the thimble 304, the sensor is arranged in the shell 100 away from the first wire mesh 200, the sensor base is made of nickel-plated steel material, the shell 100 is made of stainless steel material, and the semiconductor gas sensor using tin oxide is used, the change of [O-] on the surface of tin oxide particles is used to reflect the change of resistance value R, the tin oxide particles placed in air are heated to hundreds of degrees, once exposed to a reducing gas such as carbon monoxide, the reaction between oxygen adsorbed on the surface of the tin oxide particles and the gas makes [O-] decrease, as a result, [e] S increases, R decreases, after the reducing gas is eliminated, [O-] increases to the concentration before exposure to the gas, and R also returns to the size before exposure to the gas, and the semiconductor gas sensor using tin oxide is used to detect the gas by using this performance.

[0032] The gas to be detected enters the inside filtering area of the shell 100 through the first screen 200, and the gas to be detected can filter part of the water vapor through the sponge 502. At this time, the gas continues to pass through the second screen 303, and the gas passing through the second screen 303 passes through the cage 101 and the activated carbon pill layer, filters interfering gases such as ethanol and methane, so that propane can pass through the filter to reach the sensor. The cage 101 is provided with a plurality of small holes on both sides, and the gas passing through the activated carbon pill layer enters the inside detection area of the shell 100 through the supporting net 102. The supporting net 102 also has a plurality of small holes, and the gas to be detected passes through multiple filtrations to reach the detection area.

[0033] When the semiconductor propane sensor needs to be cleaned, the first screen 200 of the semiconductor propane sensor is pressed downward, and activated carbon pills are arranged in the cage 101. The activated carbon pills in the cage 101 are coal activated carbon. Due to its high carbon content and developed pore structure, it has natural mechanical strength advantage. Carboxymethyl starch is used to replace the traditional coal tar binder, which can improve the wear resistance of the activated carbon to 95.3%-97.1%, and significantly reduce the breakage rate under vibration. The carboxymethyl starch binder forms a colloidal substance during carbonization, enhances the adhesion between coal particles, and thus improves the wear resistance. By pressing the first screen 200 downward into the shell 100, the downward movement of the first screen 200 drives the movement of the movable plate 301 downward. The downward movement of the movable plate 301 drives the holes of the first screen 200 to fit with the pins 304. The number of holes of the first screen 200 is the same as the number of pins 304, and the holes of the first screen 200 correspond to the pins 304. At this time, the pins 304 will clean the inside of the first screen 200, and the pins 304 will block the holes of the first screen 200. By setting a plurality of pins 304, when the first screen 200 is pressed downward, the pins 304 will enter the holes of the first screen 200. The pins 304 entering the holes of the first screen 200 can clean the dust and impurities in the holes, and improve the detection quality of the semiconductor propane sensor.

[0034] When the first screen 200 is pressed downward, the elastic rod 401 is also moved 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 in sliding connection with the first sliding groove 4021. The position of the elastic rod 401 is the upper end. The first sliding groove 4021 gradually increases in depth from top to bottom. The second sliding groove 4022 gradually decreases in depth from top to bottom. The lower ends of the first sliding groove 4021 and the second sliding groove 4022 are both in the shape of an upward opening arc. The arc of the first sliding groove 4021 is larger than that of the second sliding groove 4022. The lower end of the elastic rod 401 is moved downward in the first sliding groove 4021. Under the action of the reset elastic force of the spring 305, the lower end of the elastic rod 401 is slid to the connection between the lower ends of the first sliding groove 4021 and the second sliding groove 4022. At this time, the top pin 304 will block the holes of the first screen 200, realizing the closure of the first screen 200. In this way, when the semiconductor propane sensor is not in use, the external air can be prevented from entering the semiconductor propane sensor, and dust and impurities can also be prevented from adhering to the holes of the first screen 200. Pressing the first screen 200 again will make the lower end of the elastic rod 401 slide to the second sliding groove 4022 at the connection between the lower ends of the first sliding groove 4021 and the second sliding groove 4022. The elastic rod 401 will slide to the upper end of the first sliding groove 4021 under the action of the reset elastic force of the spring 305. At this time, the first screen 200 is away from the top pin 304. At this time, the semiconductor propane sensor can work normally. By adopting the structure, when the first screen 200 is pressed into the shell 100 for the first time, the top pin 304 will block the holes of the first screen 200. In this way, when the semiconductor propane sensor is not in use, the external air and dust and impurities will not enter the sensor. When the first screen 200 is pressed into the shell 100 again, the top pin 304 will be away from the first screen 200, so that the semiconductor propane sensor can work normally.

[0035] When the first screen 200 is pressed into the shell 100, the movable plate 301 will move downward, and the waterproof cloth 501 will move downward at the same time. When the first screen 200 moves downward, the sponge 502 will be squeezed, and the water vapor adsorbed in the sponge 502 will be discharged. Since the first screen 200 of the semiconductor propane sensor is pressed downward during operation, the squeezed water is discharged through the first screen 200, and is discharged twice in succession. The waterproof cloth 501 arranged between the second screen 303 and the movable plate 301 prevents the water squeezed from the sponge 502 from flowing into other parts of the shell 100. The waterproof cloth 501 arranged between the movable plate 301 and the shell 100 also prevents water and dust from entering. The waterproof cloth 501 is made of Oxford cloth and can be pulled due to its wrinkled structure. The sponge 502 arranged at the upper end of the second screen 303 can adsorb water vapor. When the first screen 200 is pressed into the shell 100, the first screen 200 will squeeze the sponge 502, and the water vapor adsorbed in the sponge 502 will be discharged.

[0036] When the second screen 303 moves downward, the second fixed block 602 will also move downward. The surface of the second fixed block 602 moving downward is provided with a plurality of arc-shaped protruding blocks, and the upper end of the cage 101 is fixedly provided with a corresponding first fixed block 601. When the second fixed block 602 moves downward, it will slide with the protruding blocks on the first fixed block 601, causing a slight vibration. The slight vibration of the protruding blocks on the first fixed block 601 will cause the cage 101 to vibrate slightly, and the activated carbon pills inside the cage 101 will also vibrate slightly. The vibration is limited to a low frequency range (e.g. <100Hz) and is intermittent. Through the first fixed block 601 arranged at the upper end of the cage 101, when the first screen 200 is pressed into the shell 100, the second fixed block 602 will also move downward, and the second fixed block 602 will rub against the first fixed block 601 to produce a slight vibration, causing the activated carbon pills in the cage to vibrate slightly. In a long-term static state, activated carbon pills may be caked due to the adsorption of impurities or changes in humidity, causing the pores to be blocked. Slight vibration can break the electrostatic force or van der Waals force between particles through mechanical disturbance, maintain the permeability of the pores, and prolong the adsorption life of the activated carbon. Low-frequency vibration (e.g. <100Hz) can accelerate the shedding of dust, oil stains and other impurities on the surface of the activated carbon, reducing the need for manual maintenance. By maintaining the permeability of the pores, vibration can delay the performance decline of activated carbon due to adsorption saturation or chemical aging.

[0037] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application 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), a sponge (502) is fixedly connected to the upper end of the second screen (303), a squeezing mechanism (500) for squeezing the sponge (502) is provided at the upper end of the second screen (303), activated carbon pills are contained inside the cage (101), the cage (101) is arranged between the second screen (303) and the support screen (102), a thimble (304) is fixedly connected to the upper end of the second screen (303), and a shaking mechanism (600) for slightly shaking the activated carbon pills is provided at the lower end of the second screen (303); 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); 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), and a second sliding groove (4022) being provided inside the fixing plate (402), the lower end of the fixing plate (402) being fixedly connected to the support net (102), and in an initial state, one end of the elastic rod (401) close to the fixing plate (402) is slidably connected to the first sliding groove (4021), with the position of the elastic rod (401) being the upper end, the depth of the first sliding groove (4021) gradually increases from top to bottom, and the depth of the second sliding groove (4022) gradually decreases from top to bottom, and the lower ends of the first sliding groove 4021 and the second sliding groove 4022 both present an arc shape opening upward, and the arc shape of the first sliding groove (4021) is larger than the arc shape of the second sliding groove (4022).

2. The semiconductor propane sensor with a novel filter according to claim 1, characterized in that: The cleaning mechanism (300) comprises 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), and the surface of the sliding rod (302) is slidably connected to the second screen (303).

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 squeezing mechanism (500) comprises a waterproof cloth (501), the upper end of the waterproof cloth (501) being fixedly connected to the movable plate (301).

5. The semiconductor propane sensor with a novel filter according to claim 4, 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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