Gas detector and detection method

Abstract

The invention relates to the technical field of gas sensors, in particular to a gas detector and a detection method.The gas detector comprises a body and further comprises a filter screen, a sensing element, a driving assembly and a gas pump assembly.The bottom of the body is provided with a gas inlet and a gas outlet; the driving assembly and the air pump assembly are arranged in the body, one end of the driving assembly is used for driving the filter screen to horizontally rotate, and the other end of the driving assembly is used for driving the air pump assembly to perform suction action; one end of the air pump assembly is used for blowing air towards the air inlet so as to blow away dust at the bottom of the filter screen or sucking external air into the air outlet, and the other end of the air pump assembly is used for blowing air towards the air outlet so as to blow away dust at the bottom of the filter screen; the air suction and blowing structure is arranged to blow and clean the filter screen, so that the filter screen is not prone to being blocked, the frequency of manual maintenance is reduced, and the burden of maintenance work is relieved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas sensors, and in particular to a gas detector and a detection method. Background Art

[0002] Semiconductor gas sensors are a widely used gas detection device, which are usually based on metal oxide semiconductor materials such as tin oxide, zinc oxide and other materials. When the sensor elements made of these materials are exposed to specific gases, their conductivity will change. This change can be detected by the circuit and converted into information about the gas concentration.

[0003] In practical applications, especially in dusty industrial environments, the dust in the environment will not only block the air inlet of the gas detector, but also affect the sensitivity and reliability of the sensor element. For example, particulate matter may cover the surface of the sensor element, change its chemical properties, and cause distortion of the detection results; in addition, dust will accelerate the aging process of the sensor element and shorten its service life. In order to solve these problems, most of the existing solutions are to install a filter on the air inlet of the sensor. For example, CN209821114U discloses a gas sensor structure, which includes a substrate, a mesh cover and a gas-sensitive detection body. An air hole is opened at the axis of the substrate, and the air hole cooperates with the mesh cover to facilitate the diffusion and circulation of gas in the mesh cover.

[0004] As in the above technical solution, the traditional filtering method usually uses a filter to physically intercept dust from entering the interior of the detector. Although this method can solve the above problem to a certain extent, in a high-dust environment, the filter is easily blocked and requires frequent manual replacement or cleaning, which results in a heavy maintenance burden. Summary of the invention

[0005] In view of this, the present invention proposes a gas detector and a detection method, which arranges an air suction and blowing structure to purge and clean the filter, so that the filter is not easily blocked, reduces the frequency of manual maintenance, and alleviates the burden of maintenance work. It solves the problem that when the existing semiconductor gas sensor is used in a high-dust environment, the filter is easily blocked, requires frequent manual replacement or cleaning, and has a heavy maintenance burden.

[0006] The technical solution of the present invention is achieved in this way:

[0007] In one aspect, the present invention provides a gas detector, comprising a body, a filter, a sensor element, a drive assembly and an air pump assembly, wherein:

[0008] An air inlet and an air outlet are provided at the bottom of the body, the air inlet is provided with the sensor element, and the filter screen covers the bottom of the air inlet and the air outlet;

[0009] The driving assembly and the air pump assembly are arranged inside the body, one end of the driving assembly is used to drive the filter to rotate horizontally, and the other end is used to drive the air pump assembly to perform a suction action;

[0010] One end of the air pump assembly is used to blow air toward the air inlet to blow away the dust at the bottom of the filter, or to suck external gas into the exhaust port, and the other end is used to blow air toward the exhaust port to blow away the dust at the bottom of the filter.

[0011] On the basis of the above technical solution, preferably, the air pump assembly includes a cylinder, a piston and a lifting rod, wherein:

[0012] The lower end of the cylinder is open and the upper end is closed, and the lower end of the cylinder is embedded in the exhaust port;

[0013] The piston is vertically slidably disposed in the cylinder body, and the interior of the cylinder body forms a first compression chamber and a second compression chamber through the piston;

[0014] The first compression chamber is arranged above the second compression chamber, the first compression chamber is communicated with the air inlet, and the second compression chamber is communicated with the air outlet;

[0015] The lifting rod vertically penetrates the body, and the lower end of the lifting rod is fixedly connected to the piston;

[0016] The driving assembly drives the lifting rod to move up and down so that the piston reciprocates in the cylinder.

[0017] On the basis of the above technical solution, preferably, the top of the air inlet is closed, a first air delivery port is arranged on the top of the air inlet, and a second air delivery port is arranged on the top of the first compression chamber, wherein:

[0018] The second gas delivery port penetrates the cylinder body upwardly;

[0019] The second gas delivery port is communicated with the first gas delivery port through a pipeline.

[0020] On the basis of the above technical solution, preferably, the driving assembly includes a bidirectional motor, a linkage shaft, a cam plate and a roller, wherein:

[0021] The bidirectional motor is vertically fixed on the body, the lower end of the output shaft of the bidirectional motor passes through the bottom of the body downward and is detachably connected to the filter screen, and the upper end is drivingly connected to the linkage shaft;

[0022] The linkage shaft is arranged vertically, the lower end of the linkage shaft is rotatably connected to the top of the cylinder body, and the upper end is fixedly connected to the cam plate;

[0023] The cam plate is concentric with the linkage shaft, and the cam plate is tiltedly arranged on the linkage shaft;

[0024] The roller is respectively arranged one on the upper and lower sides of the cam plate, one end of the roller is rollingly connected to the surface of the cam plate, and the other end is fixed to the side of the lifting rod.

[0025] On the basis of the above technical solution, preferably, the roller includes a ball head and a shaft, wherein:

[0026] The shaft rod is arranged horizontally, one end of the shaft rod is rotatably connected to the ball head, and the other end is fixedly connected to the lifting rod.

[0027] On the basis of the above technical solution, preferably, the driving assembly further includes a synchronous pulley and a synchronous belt, wherein:

[0028] The synchronous belt pulley is fixed one at each of the upper end of the output shaft of the bidirectional motor and the linkage shaft, and the two synchronous belt pulleys are connected by the synchronous belt.

[0029] On the basis of the above technical solution, preferably, the air pump assembly further includes a vibrating rod and a pull rope, wherein:

[0030] The vibrating rod is arranged in the second compression chamber, and the vibrating rod is suspended directly below the piston through the pull rope;

[0031] The vibrating rod selectively drops onto the top of the filter screen.

[0032] On the basis of the above technical solution, preferably, the air pump assembly further includes a one-way valve, wherein:

[0033] The lower end of the cylinder body is duckbill-shaped, and a suction port is provided on the side of the lower end of the cylinder body, and the suction port is connected to the second compression chamber;

[0034] The one-way valve is embedded in the air inlet;

[0035] The filter screen is in the shape of a circular plate, a receiving groove is provided at the bottom of the body, the filter screen is rotatably arranged in the receiving groove, and the air inlet and the air outlet pass through the bottom of the receiving groove;

[0036] The long side of the duckbill structure of the cylinder body passes through the center of the filter screen and extends in the radial direction of the filter screen;

[0037] The central axis of the vibrating rod is parallel to the long side of the duckbill structure of the cylinder body.

[0038] On the basis of the above technical solution, preferably, the vibrating rod comprises a rotating drum and a rotating shaft, wherein:

[0039] The rotating shafts are rotatably arranged at both ends of the rotating drum, and a pull rope is fixed on each rotating shaft, and the upper end of the pull rope is fixed to the bottom of the piston;

[0040] The drum selectively rolls on top of the filter screen;

[0041] The surface of the rotating drum is provided with a plurality of spherical protrusions with different diameters.

[0042] On the other hand, the present invention also provides a gas detection method, using the above-mentioned gas detector to intermittently detect the target gas, comprising the following steps:

[0043] S1, the driving assembly drives the lifting rod to move downward, so that the piston slides downward inside the cylinder body. During the process, the piston squeezes the gas in the second compression chamber downward, so that the gas blows toward the filter, blows away the dust at the bottom of the filter, and realizes partial cleaning of the filter. At this time, the cleaned part of the filter is set as point a. While blowing, the vibration rod falls on the filter, causing the filter to vibrate to loosen the dust attached to the bottom of the filter. At the same time, the external gas is sucked into the air inlet, and the sensor element detects the incoming gas, and the dust in the gas is intercepted by the filter. At this time, the part where the filter intercepts the dust is set as point b;

[0044] S2. When the suction and blowing actions in step S1 are completed, the driving assembly drives the lifting rod to move upward to make the piston slide upward. During the process, the vibrating rod rises and leaves the filter, and the external gas is sucked into the second compression chamber. The dust in the gas is intercepted by the filter, and the air in the air inlet is blown toward the filter to blow away the dust at the bottom of the filter, thereby achieving partial cleaning of the filter. At this time, the part of the filter that intercepts the dust is set as point c, and the part of the filter that is cleaned is set as point d;

[0045] S3, while the driving component drives the lifting rod to rise and fall, the driving component drives the filter to rotate, so that the four points a, b, c, and d are displaced in sequence along the circumference of the filter, and then the four points a, b, c, and d are purged in sequence by a purging method. At the same time, during the descent of the piston in step S1, the vibrating rod is at the top of the rotating filter, and the filter drives the vibrating rod to roll on the filter. During the rolling process, the undulating rolling of the vibrating rod is achieved through a number of spherical protrusions of different diameters on the surface of the vibrating rod, so that the vibrating rod continuously vibrates the filter to loosen the dust attached to the bottom of the filter;

[0046] S4. Repeat steps S1 and S2, wherein the driving component drives the filter to rotate continuously, and the driving component drives the air pump component to inhale and blow air continuously, so that air is intermittently inhaled into the air inlet, and then the sensor element intermittently detects the incoming gas.

[0047] A gas detector and detection method of the present invention have the following beneficial effects compared with the prior art:

[0048] (1) One end of the air pump assembly is used to blow air toward the air inlet to blow away the dust at the bottom of the filter, or to suck the outside gas into the exhaust port, and the other end is used to blow air toward the exhaust port to blow away the dust at the bottom of the filter. The filter can be cleaned by blowing through the suction and blowing structure, making the filter less likely to be blocked and the air inlet unobstructed, thereby reducing the frequency of manual maintenance and alleviating the burden of maintenance work.

[0049] (2) By setting a vibrating rod to selectively drop to the top of the filter, it is convenient to hit the filter with the vibrating rod to achieve vibration of the filter, thereby loosening the dust attached to the bottom of the filter, making it easy to be blown away by the airflow, thereby improving the blowing effect.

[0050] (3) By setting the rotating drum to selectively roll on the top of the filter, the vibrating rod can be easily rolled by a number of spherical protrusions of different diameters on its surface, so that the vibrating rod can continuously vibrate the filter, thereby improving the effect of loosening dust and thus improving the purging effect.

[0051] (4) The drum is vibrated by the free fall of the gravity ball, which is repeated over and over again, causing the vibrating rod to vibrate continuously, thereby loosening the dust attached to the bottom of the filter and improving the blowing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0053] Figure 1 A three-dimensional diagram of a gas detector of the present invention;

[0054] Figure 2 A three-dimensional diagram of a gas detector of the present invention from another perspective;

[0055] Figure 3A partial stereoscopic diagram of a gas detector of the present invention;

[0056] Figure 4 A partial top view of a gas detector of the present invention;

[0057] Figure 5 For the present invention Figure 4 AA section view;

[0058] Figure 6 For the present invention Figure 5 BB section view;

[0059] Figure 7 A partial exploded view of a gas detector of the present invention;

[0060] Figure 8 It is a schematic diagram of the connection structure between the filter screen and the bidirectional motor of the present invention;

[0061] Fig. 9 It is a schematic diagram of the connection structure between the drive assembly and the air pump assembly of the present invention;

[0062] Fig.10 is a side view of the vibrating rod of the present invention;

[0063] Fig.11 is a cross-sectional view of the vibrating rod of the present invention;

[0064] In the figure: 1, body; 2, filter screen; 3, sensor element; 4, drive assembly; 5, air pump assembly; 21, inner ring frame; 22, outer ring frame; 23, support rod; 24, filter plate; 41, bidirectional motor; 42, linkage shaft; 43, cam plate; 44, roller; 45, synchronous pulley; 46, synchronous belt; 51, cylinder; 52, piston; 53, lifting rod; 54, vibrating rod; 55, pull rope; 56, one-way valve; 101, air inlet; 102, exhaust port; 103, first air delivery port; 104, second air delivery port; 105, receiving groove; 501, first compression chamber; 502, second compression chamber; 503, air intake port; 504, spherical protrusion; 441, ball head; 442, shaft; 541, rotating drum; 542, rotating shaft; 543, shovel plate; 544, gravity ball. DETAILED DESCRIPTION

[0065] The following will be combined with the specific implementation of the present invention to clearly and completely describe the technical solution in the present invention. Obviously, the described implementation is only a part of the implementation of the present invention, not all of the implementation. Based on the implementation of the present invention, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0066] like Figure 1-11 As shown, a gas detector of the present invention includes a body 1, a filter 2, a sensor element 3, a drive component 4 and an air pump component 5.

[0067] The main body 1 is a rectangular structure. Figure 1 As shown, a cable connection terminal is provided at the bottom of the body 1. Figure 7 As shown, the bottom of the body 1 is also provided with an air inlet 101 and an air outlet 102, and the filter 2 covers the bottom of the air inlet 101 and the air outlet 102 to filter dust. Figure 5 As shown, a sensor element 3 is disposed in the air inlet 101 for detecting the gas entering the air inlet 101 .

[0068] The driving component 4 and the air pump component 5 are arranged inside the main body 1, wherein one end of the driving component 4 is used to drive the filter 2 to rotate horizontally, and the other end is used to drive the air pump component 5 to perform a suction action. One end of the air pump component 5 is used to blow air toward the air inlet 101 to blow away the dust at the bottom of the filter 2, or to suck external gas into the exhaust port 102, and the other end is used to blow air toward the exhaust port 102 to blow away the dust at the bottom of the filter 2.

[0069] When the driving component 4 is working, one end thereof drives the filter 2 to rotate horizontally, and the other end drives the air pump component 5 to perform a suction action, wherein, during the suction action, the air pump component 5 sucks external gas (such as air in a workshop) into the air inlet 101, and the sensor element 3 detects the incoming gas. At the same time, the air pump component 5 blows the gas inside it to the exhaust port 102 to blow away the dust at the bottom of the filter 2; during the suction action, the air pump component 5 draws external gas from the exhaust port 102 into the interior of the air pump component 5, and at the same time, the air pump component 5 pumps air into the air inlet 101, so that the gas in the air inlet 101 is blown toward the filter 2, and the dust at the bottom of the filter 2 is blown away. The dust accumulated on the filter 2 is removed by the above-mentioned mechanical movement and the action of airflow, so that the filter 2 is not easily blocked, thereby keeping the air inlet 101 unobstructed, ensuring the normal operation of the sensor element 3, effectively reducing the frequency of manual maintenance, and alleviating the burden of maintenance work.

[0070] The sensing element 3 is made of metal oxide semiconductor material. When gas molecules are adsorbed on the semiconductor surface, the conductivity of the semiconductor will change, and the gas concentration is detected by measuring the change in resistance. Its specific structure and principle can be learned from the prior art (such as a semiconductor gas sensor disclosed in CN103698360A).

[0071] In order to ensure that the sensing element 3 maintains a constant temperature during operation and improve the detection accuracy, a heating element is provided at the bottom of the sensing element 3, such as Figure 5As shown, a conical hole is arranged on the bottom end of the sensing element 3, and the surface of the conical hole is a detection surface, on which gas molecules are adsorbed. The heating element is in a ring shape, which is sleeved at the orifice of the conical hole and fixed at the bottom of the sensing element 3. The sensing element 3 is centrally arranged at the central position of the air inlet 101, and an air flow channel is formed between the side of the sensing element 3 and the inner wall of the air inlet 101, and the gas entering the air inlet 101 can enter the air pump assembly 5 through the air flow channel, as shown in FIG. Figure 5 As shown, this structure is conducive to the concentration of heat into the conical hole, which is conducive to good heating of the sensor element 3. At the same time, this structure is also conducive to the concentration of gas into the conical hole, thereby improving the detection effect.

[0072] like Figure 3-9 As shown, in the gas detector, the air pump assembly 5 includes a cylinder 51 , a piston 52 and a lifting rod 53 .

[0073] Among them, Figure 6 As shown, the lower end of the cylinder body 51 is open and the upper end is closed, and the lower end of the cylinder body 51 is embedded in the exhaust port 102. Specifically, the side of the lower end of the cylinder body 51 is provided with an external thread, and the inner side of the exhaust port 102 is provided with an internal thread. The lower end of the cylinder body 51 is screwed into the exhaust port 102, which is convenient for disassembly and later maintenance.

[0074] The piston 52 is a rubber plug, which is vertically slidably disposed in the cylinder 51. At the same time, the side of the piston 52 is sealed and connected to the inner wall of the cylinder 51, so that the interior of the cylinder 51 is formed with a first compression chamber 501 and a second compression chamber 502 through the piston 52. The first compression chamber 501 is disposed above the second compression chamber 502. Figure 3 and Figure 6 As shown, the first compression chamber 501 is connected to the air inlet 101, and the second compression chamber 502 is connected to the exhaust port 102;

[0075] The lifting rod 53 vertically penetrates the body 1 and slides together, and the lower end of the lifting rod 53 is fixedly connected to the piston 52. Figure 5 As shown, the driving assembly 4 drives the lifting rod 53 to rise and fall so that the piston 52 reciprocates in the cylinder body 51, thereby changing the volume of the first compression chamber 501 and the second compression chamber 502, so as to realize the intake and exhaust of the air inlet 101 through the first compression chamber 501, or realize the intake or exhaust of the air outlet 102 through the second compression chamber 502.

[0076] like Figure 5 As shown, the top of the air inlet 101 is closed, and the upper end of the air inlet 101 is convex upward, a first air delivery port 103 is provided on the top of the air inlet 101, and a second air delivery port 104 is provided on the top of the first compression chamber 501, wherein Figure 6As shown, the second gas delivery port 104 passes through the cylinder body 51 upward. Figure 3 As shown, the second gas delivery port 104 is connected to the first gas delivery port 103 through a pipeline, and the pipeline is a hose. After the pipeline is installed, the pipeline is fixed to the body 1 by a buckle to prevent the pipeline from interfering with the drive assembly 4. The buckle is not drawn in the illustration.

[0077] like Figure 3-9 As shown, in the gas detector, the driving assembly 4 includes a bidirectional motor 41 , a linkage shaft 42 , a cam plate 43 and a roller 44 .

[0078] The bidirectional motor 41 is any motor with two output shafts in the prior art, and the two output shafts are parallel, such as a dual-rotating shaft motor disclosed in CN101154859A. Figure 3 As shown, the bidirectional motor 41 is vertically fixed on the main body 1, and the fixing method is bolt fixing. The lower end of one of the output shafts of the bidirectional motor 41 passes through the bottom of the main body 1 downward and is detachably connected to the filter 2, and the upper end of the other output end extends upward and is transmission-connected to the linkage shaft 42. When the bidirectional motor 41 is powered on, its two output shafts rotate synchronously, one of the output shafts drives the filter 2 to rotate, and the other drives the linkage shaft 42 to rotate.

[0079] like Fig. 9 As shown, the bidirectional motor 41 is connected to the linkage shaft 42 via a synchronous belt drive. Specifically, the drive assembly 4 also includes a synchronous pulley 45 and a synchronous belt 46, wherein a synchronous pulley 45 is fixed on the upper end of the output shaft of the bidirectional motor 41 and the linkage shaft 42, and the two synchronous pulleys 45 are connected via a synchronous belt 46.

[0080] In addition, the bidirectional motor 41 and the linkage shaft 42 may also be connected via other transmission methods, such as chain transmission, gear transmission, etc.

[0081] like Figure 3 As shown, the linkage shaft 42 is arranged vertically, the lower end of the linkage shaft 42 is rotatably connected to the top of the cylinder body 51 through a bearing, and the upper end is fixedly connected to the cam plate 43. The cam plate 43 is a circular plate structure with a smooth surface. After the cam plate 43 is installed, the cam plate 43 is concentric with the linkage shaft 42, and the cam plate 43 is tilted on the linkage shaft 42 with an inclination angle of 30-60 degrees. A roller 44 is respectively arranged on the upper and lower sides of the cam plate 43, one end of the roller 44 is rollingly connected to the surface of the cam plate 43, and the other end is fixed to the side of the lifting rod 53.

[0082] When the bidirectional motor 41 drives the linkage shaft 42 to rotate, Figure 3As shown, the edge of the cam plate 43 moves up and down. During the process, the cam plate 43 will drive the roller 44 to move up and down, thereby causing the lifting rod 53 connected to the roller 44 to rise and fall. Since one end of the roller 44 is rollingly connected to the surface of the cam plate 43, the roller 44 rolls along the surface of the cam plate 43 during the process of the cam plate 43 driving the roller 44, and the cooperation is relatively smooth.

[0083] like Figure 5 As shown, in order to further improve the smoothness of the cooperation between the roller 44 and the cam plate 43, the roller 44 includes a ball head 441 and a shaft rod 442, wherein the shaft rod 442 is horizontally arranged, one end of the shaft rod 442 is rotatably connected to the ball head 441, and the other end is fixedly connected to the lifting rod 53. In this structure, the surface of the spherical ball head 441 has a better contact effect with the surface of the cam plate 43, and the effect of the two when rolling and cooperating is also better.

[0084] In actual application, dust attached to the bottom surface of the filter 2 is not easy to be blown off. For this reason, a mechanical vibration mechanism is provided in the gas detector to vibrate the filter 2 to loosen the dust at the bottom of the filter 2, thereby facilitating the airflow to blow off the dust.

[0085] To achieve the above purpose, Figure 5-6 As shown, the air pump assembly 5 also includes a vibrating rod 54 and a pull rope 55, wherein the vibrating rod 54 is arranged in the second compression chamber 502, and the vibrating rod 54 is suspended directly below the piston 52 by the pull rope 55, and the vibrating rod 54 selectively drops to the top of the filter 2.

[0086] When the piston 52 falls, the vibration rod 54 first lands on the filter 2, and hits the filter 2, causing the filter 2 to vibrate, thereby loosening the dust at the bottom of the filter 2. When the piston 52 falls into place and rises, the vibration rod 54 is pulled up by the pull rope 55, so that the vibration rod 54 leaves the filter 2. When the piston 52 falls again, the vibration rod 54 hits the filter 2 again, and the cycle is repeated to achieve continuous vibration.

[0087] In the above structure, the length of the pull rope 55 is 2 / 5 to 4 / 5 of the vertical depth of the inner cavity of the cylinder body 51. For example, when the vertical depth of the inner cavity of the cylinder body 51 is 50 mm, the length of the pull rope 55 is 30 mm. When the piston 52 falls, the vibrating rod 54 will first be on the filter screen 2. When the piston 52 rises, the vibrating rod 54 will rise away from the filter screen 2.

[0088] In order to accelerate the airflow toward the exhaust port 102, Figure 6 and Fig. 9As shown, the lower end of the cylinder body 51 is in a duckbill shape, and the long side of the duckbill structure passes through the center of the filter screen 2 and extends radially along the filter screen 2. The vibrating rod 54 is located on the inner side of the duckbill structure, and the central axis of the vibrating rod 54 is parallel to the long side of the duckbill structure of the cylinder body 51. In this structure, when the piston 52 compresses the second compression chamber 502, the airflow passes through the narrowed duckbill and then sprays toward the filter screen 2. Therefore, the airflow speed will be accelerated, which can effectively improve the purging effect.

[0089] Since the lower end of the cylinder body 51 is narrowed, in order not to affect the air suction in the second compression chamber 502, an air suction port 503 is provided on the side of the lower end of the cylinder body 51. Specifically, Figure 8 and Fig. 9 As shown, the air intake port 503 is arranged on the inclined wall of the duckbill structure, the air intake port 503 is connected with the second compression chamber 502, and the air intake port 503 is connected with the exhaust port 102, and a one-way valve 56 is embedded in the air intake port 503, so that the air flow can only enter the second compression chamber 502 from the exhaust port 102. When the volume of the second compression chamber 502 becomes larger, the outside air enters the second compression chamber 502 from the duckbill structure at the lower end of the cylinder body 51, and at the same time enters the second compression chamber 502 from the air intake port 503, and the air intake is smooth.

[0090] like Figure 7 As shown, in the gas detector, the filter 2 is in the shape of a circular plate, and a receiving groove 105 for receiving the filter 2 is provided at the bottom of the main body 1, wherein the filter 2 is arranged in the receiving groove 105, and the air inlet 101 and the exhaust port 102 pass through the bottom of the receiving groove 105. When the bidirectional motor 41 is powered on, its output end drives the filter 2 to rotate in the receiving groove 105.

[0091] like Figure 8 As shown, the filter screen 2 includes an inner ring frame 21 , an outer ring frame 22 , support rods 23 and filter plates 24 .

[0092] Among them, one of the output ends of the bidirectional motor 41 passes through the center of the inner ring frame 21. After passing through, the output end is connected to the inner ring frame 21 by bolt fixing, which is convenient for replacing the filter screen 2 later.

[0093] The outer ring frame 22 is sleeved on the outer side of the inner ring frame 21 , and the two are fixedly connected by a plurality of support rods 23 , wherein the support rod 23 is located in the middle of the outer ring frame 22 , and a support groove for supporting the filter plate 24 is formed between the top of the support rod 23 and the inner wall of the outer ring frame 22 .

[0094] The filter plate 24 is an annular plate and is pasted and fixed in the support groove. The radial width of the filter plate 24 is equal to or less than the long side length of the duckbill structure at the lower end of the cylinder body 51. The top surface of the filter plate 24 contacts the bottom surface of the lower end of the cylinder body 51 or may not contact it.

[0095] like Fig.10As shown, in the gas detector, the vibrating rod 54 includes a rotating cylinder 541 and a rotating shaft 542, wherein the rotating shafts 542 are rotatably arranged on both ends of the rotating cylinder 541, a pull rope 55 is fixed on each rotating shaft 542, and the upper end of the pull rope 55 is fixed to the bottom of the piston 52, and a plurality of spherical protrusions 504 of different diameters are arranged on the surface of the rotating cylinder 541, and the spherical protrusions 504 are made of rubber and have a rough surface.

[0096] When the bidirectional motor 41 is powered on, the filter plate 24 rotates. After the vibration rod 54 lands on the filter plate 24, as the filter plate 24 rotates, the filter plate 24 will drive the vibration rod 54 to roll on the filter plate 24 through the friction between the filter plate 24 and the spherical protrusions 504. Affected by the spherical protrusions 504 of different diameters on the surface of the rotating drum 541, the vibration rod 54 will roll in a bumpy manner, that is, it will rise and fall during the rolling process, thereby achieving multiple impacts on the filter plate 24, achieving continuous vibration, improving the effect of loosening dust, and facilitating the airflow to blow the dust away from the filter screen 2. When the vibration rod 54 is lifted off the filter screen 2, the vibration rod 54 stops rolling.

[0097] like Fig.10 As shown, the spherical protrusion 504 is hemispherical, and a plurality of spherical protrusions 504 are scattered at different positions on the surface of the vibration rod 54, and the diameters of the plurality of spherical protrusions 504 are different, such as: 3mm, 5mm, 10mm, 15mm, 20mm, etc., through the plurality of spherical protrusions 504 with different diameters, when the vibration rod 54 rolls, its axis will deviate up and down to form ups and downs, thereby simulating a bumpy state, so that the vibration rod 54 hits the filter plate 24 multiple times.

[0098] In addition, if Fig.11 As shown, a shovel plate 543 is radially arranged inside the rotating drum 541, and a plurality of gravity balls 544 are also placed inside the rotating drum 541. When the rotating drum 541 rotates, the shovel plate 543 carries the gravity balls 544 upward. When the shovel plate 543 is tilted, the gravity balls 544 fall freely and vibrate the rotating drum 541. This cycle repeats and causes the vibrating rod 54 to vibrate continuously, thereby loosening the dust attached to the bottom of the filter 2.

[0099] The above gas detector is mainly used to monitor the detection of toxic and harmful gases (such as carbon monoxide, sulfur dioxide, etc.) in factory workshops to prevent poisoning incidents. When used, the gas detector is fixed in a test environment. After turning on, the target gas enters the air inlet 101, and the sensor element 3 intermittently detects the gas entering the air inlet 101. During the detection process, the filter 2 is cleaned by blowing to make the air intake smooth. The specific steps include:

[0100] S1, the driving assembly 4 drives the lifting rod 53 to move downward, so that the piston 52 slides downward inside the cylinder body 51. During the process, the piston 52 squeezes the gas in the second compression chamber 502 downward, so that the gas blows toward the filter 2, blows away the dust at the bottom of the filter 2, and realizes partial cleaning of the filter 2. At this time, the cleaned part of the filter 2 is set as point a. While blowing, the vibration rod 54 falls on the filter 2, causing the filter 2 to vibrate to loosen the dust attached to the bottom of the filter 2. At the same time, the external gas is sucked into the air inlet 101, and the sensor element 3 detects the incoming gas, and the dust in the gas is intercepted by the filter 2. At this time, the part where the filter 2 intercepts the dust is set as point b;

[0101] S2. When the suction and blowing actions in step S1 are completed, the driving assembly 4 drives the lifting rod 53 to move upward to make the piston 52 slide upward. During the process, the vibrating rod 54 rises and leaves the filter 2, and the external gas is sucked into the second compression chamber 502. The dust in the gas is intercepted by the filter 2, and the air in the air inlet 101 is blown toward the filter 2 to blow away the dust at the bottom of the filter 2, so as to achieve partial cleaning of the filter 2. At this time, the part of the filter 2 that intercepts the dust is set as point c, and the part of the filter 2 that is cleaned is set as point d;

[0102] S3, while the driving component 4 drives the lifting rod 53 to rise and fall, the driving component 4 drives the filter 2 to rotate, so that the four points a, b, c, and d are displaced in sequence along the circumference of the filter 2, and then the four points a, b, c, and d are purged in sequence by a purging method. At the same time, during the descent of the piston 52 in step S1, the vibrating rod 54 is at the top of the rotating filter 2, and the filter 2 will drive the vibrating rod 54 to roll on the filter 2. During the rolling process, a plurality of spherical protrusions of different diameters on the surface of the vibrating rod 54 are 504 is used to realize the bumpy rolling of the vibration rod 54, so that the vibration rod 54 continuously vibrates the filter screen 2. At the same time, the shovel plate 543 carries the gravity ball 544 to rise. When the shovel plate 543 is tilted, the gravity ball 544 falls freely and vibrates the rotating drum 541. The cycle is repeated to make the vibration rod 54 vibrate continuously, thereby loosening the dust attached to the bottom of the filter screen 2. Since the filter screen 2 keeps rotating, the parts of the filter screen 2 except the four points a, b, c, and d can be purged by blowing.

[0103] S4, repeating steps S1 and S2, the driving component 4 drives the filter 2 to rotate continuously, and the driving component 4 drives the air pump component 5 to inhale and blow air continuously, so that the air inlet 101 intermittently inhales air, and then the sensor element 3 intermittently detects the incoming gas.

[0104] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas detector, comprising a body (1), characterized in that: It also includes a filter screen (2), a sensor element (3), a drive assembly (4) and an air pump assembly (5), wherein: An air inlet (101) and an air outlet (102) are provided at the bottom of the body (1), the air inlet (101) is provided with the sensor element (3), and the filter (2) covers the bottom of the air inlet (101) and the air outlet (102); The driving component (4) and the air pump component (5) are arranged inside the body (1); one end of the driving component (4) is used to drive the filter screen (2) to rotate horizontally, and the other end is used to drive the air pump component (5) to perform a suction action; One end of the air pump assembly (5) is used to blow air in the direction of the air inlet (101) to blow away the dust at the bottom of the filter (2), or to draw external gas into the exhaust port (102), and the other end is used to blow air in the direction of the exhaust port (102) to blow away the dust at the bottom of the filter (2).

2. A gas detector according to claim 1, characterized in that: The air pump assembly (5) comprises a cylinder (51), a piston (52) and a lifting rod (53), wherein: The lower end of the cylinder body (51) is open and the upper end is closed, and the lower end of the cylinder body (51) is embedded in the exhaust port (102); The piston (52) is vertically slidably disposed in the cylinder body (51), and the interior of the cylinder body (51) forms a first compression chamber (501) and a second compression chamber (502) through the piston (52); The first compression chamber (501) is arranged above the second compression chamber (502), the first compression chamber (501) is connected to the air inlet (101), and the second compression chamber (502) is connected to the air outlet (102); The lifting rod (53) vertically penetrates the body (1), and the lower end of the lifting rod (53) is fixedly connected to the piston (52); The driving assembly (4) drives the lifting rod (53) to move up and down, so that the piston (52) reciprocates in the cylinder body (51).

3. A gas detector as claimed in claim 2, characterized in that: The top of the air inlet (101) is closed, a first air delivery port (103) is provided on the top of the air inlet (101), and a second air delivery port (104) is provided on the top of the first compression chamber (501), wherein: The second gas delivery port (104) penetrates the cylinder body (51) upwards; The second gas delivery port (104) is connected to the first gas delivery port (103) via a pipeline.

4. A gas detector as claimed in claim 2, characterized in that: The driving assembly (4) comprises a bidirectional motor (41), a linkage shaft (42), a cam plate (43) and a roller (44), wherein: The bidirectional motor (41) is vertically fixed on the body (1); the lower end of the output shaft of the bidirectional motor (41) passes through the bottom of the body (1) downwards and is detachably connected to the filter screen (2); and the upper end is drivingly connected to the linkage shaft (42); The linkage shaft (42) is arranged vertically, the lower end of the linkage shaft (42) is rotatably connected to the top of the cylinder body (51), and the upper end is fixedly connected to the cam plate (43); The cam plate (43) is concentric with the linkage shaft (42), and the cam plate (43) is tiltedly arranged on the linkage shaft (42); The roller (44) is provided one at each of the upper and lower sides of the cam plate (43); one end of the roller (44) is rollingly connected to the surface of the cam plate (43), and the other end is fixed to the side of the lifting rod (53).

5. A gas detector as claimed in claim 4, characterized in that: The roller (44) comprises a ball head (441) and a shaft (442), wherein: The shaft rod (442) is arranged horizontally, one end of the shaft rod (442) is rotatably connected to the ball head (441), and the other end is fixedly connected to the lifting rod (53).

6. A gas detector as claimed in claim 4, characterized in that: The driving assembly (4) further comprises a synchronous pulley (45) and a synchronous belt (46), wherein: One synchronous pulley (45) is fixed on each of the upper end of the output shaft of the bidirectional motor (41) and the linkage shaft (42), and the two synchronous pulleys (45) are connected via the synchronous belt (46).

7. A gas detector as claimed in claim 2, characterized in that: The air pump assembly (5) further comprises a vibrating rod (54) and a pull rope (55), wherein: The vibrating rod (54) is arranged in the second compression chamber (502), and the vibrating rod (54) is suspended directly below the piston (52) via the pull rope (55); The vibrating rod (54) selectively drops to the top of the filter screen (2).

8. A gas detector as claimed in claim 7, characterized in that: The air pump assembly (5) further comprises a one-way valve (56), wherein: The lower end of the cylinder body (51) is duckbill-shaped, and a suction port (503) is provided on the side of the lower end of the cylinder body (51), and the suction port (503) is connected to the second compression chamber (502); The one-way valve (56) is embedded in the air intake port (503); The filter screen (2) is in the shape of a circular plate, a receiving groove (105) is provided at the bottom of the body (1), the filter screen (2) is rotatably arranged in the receiving groove (105), and the air inlet (101) and the air outlet (102) pass through the bottom of the receiving groove (105); The long side of the duckbill structure of the cylinder body (51) passes through the center of the filter screen (2) and extends along the radial direction of the filter screen (2); The central axis of the vibrating rod (54) is parallel to the long side of the duckbill-shaped structure of the cylinder body (51).

9. A gas detector as claimed in claim 8, characterized in that: The vibrating rod (54) comprises a rotating cylinder (541) and a rotating shaft (542), wherein: The rotating shafts (542) are rotatably arranged at both ends of the rotating drum (541), and a pull rope (55) is fixed on each of the rotating shafts (542), and the upper ends of the pull ropes (55) are fixed to the bottom of the piston (52); The rotating drum (541) selectively rolls on top of the filter screen (2); The surface of the rotating drum (541) is provided with a plurality of spherical protrusions (504) of different diameters.

10. A gas detection method, characterized in that: Using the gas detector as claimed in claim 9 to intermittently detect the target gas comprises the following steps: S1, the driving component (4) drives the lifting rod (53) to move downward, so that the piston (52) slides downward inside the cylinder body (51). During the process, the piston (52) squeezes the gas in the second compression chamber (502) downward, so that the gas blows toward the filter (2), blows away the dust at the bottom of the filter (2), and achieves partial cleaning of the filter (2). At this time, the cleaned part of the filter (2) is set as point a. While blowing, the vibration rod (54) falls on the filter (2), causing the filter (2) to vibrate to loosen the dust attached to the bottom of the filter (2). At the same time, the external gas is sucked into the air inlet (101), and the sensor element (3) detects the incoming gas, and the dust in the gas is intercepted by the filter (2). At this time, the part of the filter (2) that intercepts the dust is set as point b; S2. When the suction and blowing actions in step S1 are completed, the driving component (4) drives the lifting rod (53) to move upward so that the piston (52) slides upward. During the process, the vibrating rod (54) rises and leaves the filter (2), and the external gas is sucked into the second compression chamber (502). The dust in the gas is intercepted by the filter (2), and the air in the air inlet (101) is blown toward the filter (2) to blow away the dust at the bottom of the filter (2), thereby achieving partial cleaning of the filter (2). At this time, the part of the filter (2) that intercepts the dust is set as point c, and the part of the filter (2) that is cleaned is set as point d; S3, while the driving component (4) drives the lifting rod (53) to rise and fall, the driving component (4) drives the filter (2) to rotate, so that the four points a, b, c, and d are displaced in sequence along the circumference of the filter (2), and then the four points a, b, c, and d are purged in sequence by a purging method. At the same time, during the descent of the piston (52) in step S1, the vibrating rod (54) is at the top of the rotating filter (2), and the filter (2) drives the vibrating rod (54) to roll on the filter (2). During the rolling process, the vibrating rod (54) is rolled up and down by a plurality of spherical protrusions (504) of different diameters on the surface of the vibrating rod (54), so that the vibrating rod (54) continuously vibrates the filter (2) to loosen the dust attached to the bottom of the filter (2); S4, repeating steps S1 and S2, wherein the driving component (4) drives the filter (2) to rotate continuously, and the driving component (4) drives the air pump component (5) to inhale and blow air continuously, so that air is intermittently inhaled into the air inlet (101), thereby causing the sensor element (3) to intermittently detect the incoming gas.

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