CN108333315B - Gas detector with bionic flow guide structure and variable position sensor - Google Patents
Gas detector with bionic flow guide structure and variable position sensor Download PDFInfo
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- CN108333315B CN108333315B CN201810314013.4A CN201810314013A CN108333315B CN 108333315 B CN108333315 B CN 108333315B CN 201810314013 A CN201810314013 A CN 201810314013A CN 108333315 B CN108333315 B CN 108333315B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0031—General constructional details of gas analysers, e.g. portable test equipment concerning the detector comprising two or more sensors, e.g. a sensor array
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Abstract
The invention relates to a gas detector with a bionic flow guiding structure and a variable position sensor, which belongs to the technical field of gas component detection. The bionic deflector group is matched with the shell, so that the strong and weak stimulation areas of the gas are more obvious, the detection effect can be enhanced, the error caused by mutual interference is reduced, the gas detector is more sensitive to the detection of the gas components, the result is accurate, the operation is simple and convenient and rapid, and the requirement on the gas concentration is low.
Description
Technical Field
The invention belongs to the technical field of unknown gas component detection, and particularly relates to a gas component detector with a bionic cavity and a movable sensor.
Background
1. Oil shale is recognized worldwide as the first alternative energy source for conventional oil and gas, and becomes an important backup energy source which must be considered in the strategic development of energy resources in countries around the world. In the oil shale stratum, the hydrocarbon gas content is higher, and accurate positioning and content analysis of the oil shale stratum can be realized through detecting the hydrocarbon gas concentration of gas generated in the drilling process.
2. The electronic nose, namely the gas detector, is a gas detection instrument which is developed by imitating the olfactory organ of a mammal, and is widely applied to the fields of food and beverage production industry, environment detection, medicine, agriculture and the like due to the characteristics of high reliability, high practicability and short recognition period of electronic nose detection. However, the traditional electronic nose optimizes the detection result by using methods such as manually improving the gas concentration and optimizing the post calculation, which directly limits the application range and the application environment of the electronic nose and affects the accuracy of the detection result to a certain extent. Through carrying out reasonable design to the inside of electron nasal cavity, utilize biological characteristics and bionics to combine to optimize the gas signal that the sensor received, have easy operation, application environment wide, the detection composition is many, operation result is more ideal advantage, and do not have the electron nose of special utilization cavity structure optimization thereby optimizing the detection result at present.
3. The mouse has sensitive smell due to the 'V' -shaped flow track of the gas in the nasal cavity and the space structure in the nasal cavity. In the dorsal crypt region and the anterior region of the nasal cavity of the mouse, the gas flow velocity is faster, and more olfactory cells and cilia are distributed. The gas flow rates in the middle region and the rear region decrease in sequence, and the olfactory cell density decreases. The phenomenon of the murine nasal cavity and the corresponding structure are applied to the electronic nasal cavity body, so that the current situation that the electronic nose can only be optimized by a single algorithm at the present stage is improved.
Disclosure of Invention
The invention aims to provide a bionic electronic nose for oil shale sniffing and solves the problem that the current electronic nose can only optimize a later algorithm, so that the optimization effect is not obvious. The bionic electronic nose is designed according to the correlation between olfactory cells and olfactory cilia distribution in the nasal cavity of the mouse and the gas flow velocity in the nasal cavity of the mouse, so that the bionic electronic nose has good flow guiding capacity and measuring accuracy, meanwhile, a movable sensor group is designed in the electronic nose, the differential distribution of a plurality of sensors in space is realized, and the sniffing capacity of the electronic nose is improved by utilizing the time difference and the space difference of signals received by different sensors.
The invention consists of a shell A, a center support B, a variable position sensor group C, a tail support D, a tail ring piece E, a motor F, a threaded rod G and a rotary pin H, wherein five variable position sensors of the variable position sensor group C are assembled in five sliding rails of a sliding rail group 5 of the center support B, and a base 14 of each of the five variable position sensors is in sliding connection with the sliding rail of the sliding rail group 5; only the bottom of the base 14 of one of the five sensors engages the threaded rod G for a period of time. The top ends of six guide support plates of the guide support plate group 11 in the tail support D are fixedly connected with the groove group 1 of the three sections III on the shell A. Six support legs of the support leg group 6 in the center support B are fixedly connected with a blind hole I10 on the tail support D. The outer end of the supporting plate group 4 on the center support B is tangent with the inner wall of the front section I and the inner wall of the near left part of the two sections II in the shell A, and the supporting plate group can be disassembled when necessary. The threaded rod G passes through the center surrounded by the through hole 9 of the tail support D and the five sliding rails of the sliding rail group 5 in the center support B, the left end blind hole II 15 of the threaded rod G is movably connected with the pin II 18 of the rotary pin H, and the pin I17 of the rotary pin H is fixedly connected with the blind hole IIIm of the center support B. The longitudinal axis of the threaded rod G is parallel to the longitudinal axis of the housing a and does not coincide. And an output shaft of the motor F is fixedly connected with the right end of the threaded rod G.
The tail ring piece E is fixedly connected with the tail support D in a gluing mode, and an inner rail 16 of the tail ring piece is movably connected with an annular groove n at the right part of the threaded rod G.
The axes of the shell A, the center support B, the variable position sensor group C, the tail support D, the tail ring piece E and the pin I17 of the rotary pin H are overlapped, the axes of the threaded rod G and the pin II 18 of the rotary pin H are overlapped, and the two axes are parallel to each other and have a distance of 1-3mm.
The shell A is formed by sequentially connecting a front section I, a second section II, a third section III and four sections IV, the total length L1 of the shell A is 100-150mm, and the thickness h1 of the shell A is 6-12mm. Wherein the second section II, the third section III and the fourth section IV are round tubes,
the length L4 of the second section II is 40-75mm, and the diameter d3 is 46-56mm.
The length L3 of the three sections III is 40-55mm, the diameter d is 60-68mm, six grooves of the groove group 1 uniformly distributed along the circumference are arranged on the inner wall of the three sections III, and the groove width h2 is 3-5mm.
The length L2 of the four sections IV is 40-55mm, and the diameter d1 is 60-80mm.
The diameter d4 of the left end of the front section I is 4-8mm, the peripheral outline of the front section I is obtained by rotating an a-b curve along the longitudinal axis of the shell A for one circle, and the mathematical expression of the a-b curve is as follows: when the point b is taken as an origin, a straight line passing through the point b and parallel to the longitudinal axis of the shell A is taken as an x-axis, the right direction is taken as an x-axis positive direction, the point b is passed through and perpendicular to the x-axis is taken as a y-axis, and a coordinate system is established upwards for the y-axis positive direction, the expression is as follows:
y=1.7×10 -3 x 3 —7.3×10 -2 x 2 ＋6.3×10 -2 x—0.207。
the center support B comprises a support leg group 6, a slide rail group 5 and a guide plate group 3, wherein the guide plate group 3, the slide rail group 5, the independent sensors 8 and the support leg group 6 are sequentially arranged from left to right, the right ends of five slide rails of the slide rail group 5 are fixedly connected with six support legs of the support leg group 6, the left ends of six slide rails of the slide rail group 5 are fixedly connected with the right end of the guide plate group 3, three support plates of the support plate group 4 are uniformly distributed on the outer circumference of the guide plate group 3, and a sensor placing hole 2 is formed in the center of the left end of the guide plate group 3.
The independent sensor 8 is fixedly connected to the center line of the upper surface of the wide guide rail of the slide rail group 5, the distance L7 between the left end of the independent sensor 8 and the right end of the guide plate group 3 is 5-9mm, the size of the circular tube of the independent sensor 8 is the same as that of the circular tube 13 of the variable position sensor group C, the inner diameter is 9-12mm, and the width is 5-10mm.
The central axis of the sensor mounting hole 2 coincides with the central axis of the gas detector, and the diameter d 2 8-12mm long with a diameter of 0.75 times.
The central outer edge of the left end of the deflector group 3 is provided with a deflector ring 7 with a fusiform section.
3 length L of deflector group 1 15-30mm, radius r of its outer layer rotary structure 2 Radius r of the middle layer rotary structure of 14-22mm 1 Is 12-18mm and contains a center thickness L 6 A deflector ring 7 of 2-4mm fusiform cross section, wherein:
when taking the f point as the origin, taking the straight line where f-i is positioned as the x axis, taking the left direction as the positive direction of the x axis, taking the x axis as the y axis after passing the f point and being vertical to the x axis, and taking the upward direction as the positive direction of the y axis to establish a coordinate system,
the c-d segment curve equation is: y= -3.3×10 -2 x 2 ＋0.492x＋11.338；
The j-e section curve equation is: y=7×10 -4 x 3 —2×10 -2 x 2 ＋0.236x＋2.985；
The i-k-f segment curve equation is: y= -0.01x 2 ＋0.2x；
The i-l-f section curve equation is: y=0.01 x 2 —0.2x；
The h-g section curve equation is: y= -7 x 10 -4 x 3 ＋2×10 -2 x 2 —0.236x—2.985。
The variable position sensor group C consists of five sensors, the sensors are in a circular tube shape, and a base 14 is arranged outside the circular tube 13; the inner diameter of the round tube 13 is 9-12mm, and the width is 5-10mm.
The total length of the tail support D is 40-55mm, the tail support D consists of a six-edge tube, a sensor group 12 and a flow guide support plate group 11, a through hole 9 is arranged in the center of the tail support D, and the diameter is 6-9mm; six blind holes with the length of 5-7mm are formed in the left end pipe wall and fixedly connected with the support leg group 6 of the center support B; the flow guide support plate group 11 is 25-32mm long, 1-3mm wide and 23-28mm high, and has six flow guide support plates with chamfer diameters of 1-3mm, wherein the six flow guide support plates are uniformly distributed on six edges of the left part of the six-edge pipe, the included angle alpha is 60 degrees, three sensors of the sensor group 12 are uniformly distributed on three edges of the right part of the six-edge pipe, the circle center of each sensor is 10-15mm high, the diameter is 8-10mm, and the wall thickness is 1-2mm.
The width of the tail ring piece E is 2-3mm, the included inner rail 16 is a 300-degree annular through hole, and the distance between the central line of the inner rail and the axis of the tail ring piece E is 1-3mm.
The diameter of the pin I17 and the diameter of the pin II 18 of the rotary pin H are 1-1.5mm, and the length of the pin I and the pin II are 2-4mm; pin I17 is parallel to the axis of pin II 18 and is 1-3mm in distance. The total length of the rotary pin is 4-8mm.
The working process and principle of the invention are as follows: the sensor mounting hole 2, the independent sensor 8, the variable position sensor group C and the sensor group 12 are respectively mounted with a toxic and harmful gas sensor a, a toxic and harmful gas sensor b, a gas effective component sensor C-g and a wide area gas sensor h-j. And the air extractor positioned behind the electronic nose works to suck the air to be detected into the electronic nose. The gas to be measured firstly passes through a toxic and harmful gas sensor a to determine whether the gas contains components harmful to human bodies. If so, the operation and detection sites can be replaced in time, so that the poisoning event of measuring and mining personnel is prevented. The gas to be tested is guided by the guide plate group 3 and then contacts with the toxic and harmful gas sensor b again to check toxicity, and then enters the area where the variable position sensor group C is located to react with the gas effective component sensors C-d. The tail end of the deflector group 3 is a strong stimulation area of gas, and the measuring effect of the gas effective component sensor positioned at the strong stimulation area is more obvious.
If the signal of the corresponding component of the front gas effective component sensor c is not detected and the rear gas effective component sensor e is detected, the motor is utilized to rotate the threaded rod G to transmit the gas effective component sensor e to the strong stimulation area, the gas effective component sensor c is retracted into the weak stimulation area, the interference of gas measurement is avoided, and the corresponding gas component is continuously measured in the weak stimulation area;
if the components I and II occupy the main position and the components III, IV and V occupy the secondary position, the sensors for measuring the components I and II can be placed in a strong stimulation area through a threaded rod G by using a motor, and the sensors for measuring the components III, IV and V are placed in a weak stimulation area through the threaded rod G by using the motor, so that the mutual turbulence caused by the fact that the sensors are positioned on the same plane is avoided, and the measurement accuracy is improved;
besides, different gas components have different optimal measurement flow rates, and an optimal measurement area can be selected by adjusting the relative positions of the sensors in the variable position sensor group C, so that the measurement accuracy of the different gas components during simultaneous measurement is improved. The different spatial distributions of the sensors in the variable position sensor group C lead the gas measurement signals to have differences, thereby facilitating the later calculation. After passing through the variable position sensor group C, the gas is guided again through the guiding support plate group 11, flows through the wide area gas sensors h-j on the sensor group 12, and other minor components which may exist are measured.
By utilizing the threaded rod G, the variable position sensor group C can be redistributed in space in time, so that the complicated operation of repeatedly replacing the sensor is avoided, the time and raw materials are saved, the operation is simplified, and the measurement accuracy is improved.
The movement principle of the variable position sensor group C is as follows: the angle of the motor F and the fixedly connected threaded rod G is manually changed to enable the threads of the threaded rod G to be meshed with the base 14 of the sensor needed in the sensor group C, then the motor is started to control the threaded rod to rotate, and the relative position of the meshed sensor on the sliding rail group 5 is changed through the rotation of the threads; the spatial distribution of the sensors in the variable position sensor group C can be changed by repeating the steps.
The beneficial effects of the invention are that
1. The sensor is provided with a front sensor mounting hole, and can be used for loading a toxic and harmful gas sensor, so that dangerous components can be early warned, and production accidents can be prevented.
2. The flow guiding structure with the bionic structure increases the sensitivity and reliability of gas detection.
3. The variable position sensor capable of changing the relative position changes the current situation that the gas sensor only detects simultaneously on the same two-dimensional plane, reduces disturbance interference among different sensors, increases the three-dimensional space detection capability of gas signals, and solves the problem that the optimal measurement flow rates of different gas components are different.
4. The detector is simple to operate, convenient to assemble and disassemble, capable of being used by being matched with different sensors, and capable of detecting various different gases in a short time.
Drawings
FIG. 1 is a schematic diagram of a gas detector with a bionic flow guiding structure and a variable position sensor
FIG. 2 is a right side view of a gas detector with a bionic deflector structure and a variable position sensor
FIG. 3 is a sectional view of H-H of FIG. 2
Fig. 4 is a schematic structural view of the housing a
FIG. 5 is a left side view of the housing A
FIG. 6 is a front half-sectional view of the housing A
FIG. 7 is a schematic view of the structure of the center support B
FIG. 8 is a schematic front partial cutaway view of center support B
FIG. 9 is a left side view of the center support B
FIG. 10 is a schematic diagram of a flow guiding structure of the center support B
Fig. 11 is a right side view of the slide rail set 5
FIG. 12 is a schematic view of the structure of the tail support D
FIG. 13 is a front half sectional view of the aft mount D
FIG. 14 is a left side view of the aft mount D
FIG. 15 is a schematic view of a single sensor rack for a variable position sensor set C
FIG. 16 is a left side view of the variable position sensor set C
FIG. 17 is a schematic view of tail ring segment E
FIG. 18 is a left side view of tail ring segment E
FIG. 19 is a schematic view of a threaded rod G
FIG. 20 is a schematic view of a left blind hole of the threaded rod G
FIG. 21 is a schematic view of a pivot pin H
FIG. 22 is a schematic view of the cylindrical surface of the pivot pin H
Wherein: A. the sensor comprises a shell B, a center support C, a variable position sensor group D, a tail support E, a tail ring plate F, a motor G, a threaded rod H, a rotary pin I, a front section II, a second section III, a third section IV, a fourth section 1, a groove group 2, a sensor mounting hole 3, a guide plate group 4, a support plate group 5, a slide rail group 6, a support leg group 7, a shuttle-shaped section guide ring 8, an independent sensor 9, a through hole 10, a blind hole 11, a guide support plate group 12, a sensor group 13, a sensor mounting groove 14, a base 15, a blind hole 16, an inner rail 17, a pin I18, a pin II m, a blind hole III n and an annular groove
Detailed Description
The following description is made with reference to the accompanying drawings
As shown in fig. 1-3, the invention consists of a shell a, a center support B, a variable position sensor group C, a tail support D, a tail ring piece E, a motor F, a threaded rod G and a rotary pin H, wherein five variable position sensors of the variable position sensor group C are assembled in five sliding rails of a sliding rail group 5 of the center support B, and a base 14 of the five sensors is in sliding connection with the sliding rails of the sliding rail group 5; during a period of time, the bottom of the base 14 of only one sensor of the five sensors is meshed with the threaded rod G, so that the sensors are driven to move by the rotation of the threaded rod G, and the other four sensors are in a non-meshed state with the threaded rod G at the moment.
The top ends of six guide support plates of the guide support plate group 11 in the tail support D are fixedly connected with the groove group 1 of the three sections III on the shell A.
Six support legs of the support leg group 6 in the center support B are fixedly connected with a blind hole I10 on the tail support D; the outer end of the supporting plate group 4 on the center support B is tangent with the inner wall of the front section I and the inner wall of the near left part of the two sections II in the shell A, and the supporting plate group can be disassembled when necessary.
The threaded rod G passes through the center surrounded by the through hole 9 of the tail support D and the five sliding rails of the sliding rail group 5 in the center support B, a blind hole II 15 at the left end of the threaded rod G is movably connected with a pin II 18 of the rotary pin H, and a pin I17 of the rotary pin H is fixedly connected with a blind hole IIIm of the center support B; the longitudinal axis of the threaded rod G is parallel to the longitudinal axis of the shell A and is not coincident with the longitudinal axis of the shell A; and an output shaft of the motor F is fixedly connected with the right end of the threaded rod G.
The tail ring piece E is fixedly connected with the tail support D in a gluing mode, the inner rail 16 of the tail ring piece is movably connected with the annular groove n at the right part of the threaded rod G, the relative position of the axis of the threaded rod G and the axis of the whole detector is positioned, and meanwhile, the threaded rod G is ensured not to generate excessive deformation and vibration during working.
The axes of the shell A, the center support B, the variable position sensor group C, the tail support D, the tail ring piece E and the pin I17 of the rotary pin H are overlapped, the axes of the threaded rod G and the pin II 18 of the rotary pin H are overlapped, and the two axes are parallel to each other and have a distance of 1-3mm.
As shown in fig. 4-6, the shell A is formed by sequentially connecting a front section I, a second section II, a third section III and four sections IV, the total length L1 of the shell A is 100-150mm, and the thickness h1 of the shell A is 6-12mm. Wherein the second section II, the third section III and the fourth section IV are round tubes,
the length L4 of the second section II is 40-75mm, and the diameter d3 is 46-56mm
The length L3 of the three sections III is 40-55mm, the diameter d is 60-68mm, six grooves of the groove group 1 uniformly distributed along the circumference are arranged on the inner wall of the three sections III, and the groove width h2 is 3-5mm;
the length L2 of the four sections IV is 40-55mm, and the diameter d1 is 60-80mm.
The diameter d4 of the left end of the front section I is 4-8mm, the peripheral outline of the front section I is obtained by rotating an a-b curve along the longitudinal axis of the shell A for one circle, and the mathematical expression of the a-b curve is as follows: when the point b is taken as an origin, a straight line passing through the point b and parallel to the longitudinal axis of the shell A is taken as an x-axis, the right direction is taken as an x-axis positive direction, the point b is passed through and perpendicular to the x-axis is taken as a y-axis, and a coordinate system is established upwards for the y-axis positive direction, the expression is as follows:
y=1.7×10 -3 x 3 —7.3×10 -2 x 2 ＋6.3×10 -2 x—0.207。
as shown in fig. 7-10, the center support B is composed of a supporting leg group 6, a sliding rail group 5 and a guiding plate group 3, wherein the guiding plate group 3, the sliding rail group 5, the independent sensor 8 and the supporting leg group 6 are sequentially arranged from left to right, the right ends of five sliding rails of the sliding rail group 5 are fixedly connected with six supporting legs of the supporting leg group 6, the left ends of six sliding rails of the sliding rail group 5 are fixedly connected with the right end of the guiding plate group 3, three supporting plates of the supporting plate group 4 are uniformly distributed on the outer circumference of the guiding plate group 3, and the center of the left end of the guiding plate group 3 is provided with a sensor placing hole 2.
The independent sensor 8 is fixedly connected to the center line of the upper surface of the wide guide rail of the slide rail group 5, the distance L7 between the left end of the independent sensor 8 and the right end of the guide plate group 3 is 5-9mm, the size of a circular tube of the independent sensor 8 is the same as that of a circular tube 13 of the variable position sensor group C, the inner diameter is 9-12mm, and the width is 5-10mm; the central axis of the sensor mounting hole 2 coincides with the central axis of the gas detector, and the diameter d 2 8-12mm long with a diameter of 0.75 times.
The central outer edge of the left end of the deflector group 3 is provided with a deflector ring 7 with a fusiform section; 3 length L of deflector group 1 15-30mm, radius r of its outer layer rotary structure 2 Radius r of the middle layer rotary structure of 14-22mm 1 Is 12-18mm and contains a center thickness L 6 A deflector ring 7 of 2-4mm fusiform cross section, wherein:
when taking the f point as the origin, taking the straight line where f-i is positioned as the x axis, taking the left direction as the positive direction of the x axis, taking the x axis as the y axis after passing the f point and being vertical to the x axis, and taking the upward direction as the positive direction of the y axis to establish a coordinate system,
the c-d segment curve equation is: y= -3.3×10 -2 x 2 ＋0.492x＋11.338；
The j-e section curve equation is: y=7×10 -4 x 3 —2×10 -2 x 2 ＋0.236x＋2.985；
The i-k-f segment curve equation is: y= -0.01x 2 ＋0.2x；
The i-l-f section curve equation is: y=0.01 x 2 —0.2x；
The h-g section curve equation is: y= -7 x 10 -4 x 3 ＋2×10 -2 x 2 —0.236x—2.985。
As shown in fig. 15 and 16, the variable position sensor group C is composed of five sensors, the sensors are in a circular tube shape, and a base 14 is arranged outside the circular tube 13; the inner diameter of the circular tube 13 is 9-12mm, and the width is 5-10mm.
As shown in fig. 12-14, the total length of the tail support D is 40-55mm, the tail support D consists of a six-edge tube, a sensor group 12 and a flow guide support plate group 11, a through hole 9 is arranged in the center of the tail support D, and the diameter is 6-9mm; six blind holes with the length of 5-7mm are formed in the left end pipe wall and fixedly connected with the support leg group 6 of the center support B; the flow guide support plate group 11 is 25-32mm long, 1-3mm wide and 23-28mm high, and has six flow guide support plates with chamfer diameters of 1-3mm, wherein the six flow guide support plates are uniformly distributed on six edges of the left part of the six-edge pipe, the included angle alpha is 60 degrees, three sensors of the sensor group 12 are uniformly distributed on three edges of the right part of the six-edge pipe, the circle center of each sensor is 10-15mm high, the diameter is 8-10mm, and the wall thickness is 1-2mm.
As shown in figures 17 and 18, the width of the tail ring piece E is 2-3mm, the included inner rail 16 is a 300-degree annular through hole, and the distance between the central line of the inner rail and the axis of the tail ring piece E is 1-3mm.
As shown in figures 21 and 22, the diameter of the pin I17 and the pin II 18 of the rotary pin H is 1-1.5mm, and the length is 2-4mm; pin I17 is parallel to the axis of pin II 18 and is 1-3mm in distance. The total length of the rotary pin is 4-8mm.
Claims (7)
1. A gas detector with a bionic cavity and a variable position sensor, characterized in that: the device consists of a shell (A), a center support (B), a variable position sensor group (C), a tail support (D), a tail ring piece (E), a motor (F), a threaded rod (G) and a rotary pin (H), wherein five variable position sensors of the variable position sensor group (C) are assembled in five sliding rails of a sliding rail group (5) of the center support (B), and bases (14) of the five sensors are in sliding connection with the sliding rails of the sliding rail group (5); the bottom of the base (14) of only one sensor of the five sensors is meshed with the threaded rod (G) in a time period; the top ends of six guide support plates of the guide support plate group (11) in the tail support (D) are fixedly connected with the groove group (1) of the three sections (III) on the shell (A); six support legs of the support leg group (6) in the center support (B) are fixedly connected with a blind hole I (10) on the tail support (D); the outer end of the upper supporting plate group (4) of the center support (B) is tangent with the inner wall of the front section (I) and the near left part of the two sections (II) in the shell (A), so that the assembly and the disassembly can be performed; the threaded rod (G) passes through the center surrounded by the five sliding rails of the sliding rail group (5) in the tail support (D) and the center support (B), a blind hole II (15) at the left end of the threaded rod (G) is movably connected with a pin II (18) of the rotary pin (H), and a pin I (17) of the rotary pin (H) is fixedly connected with a blind hole (m) of the center support (B); the longitudinal axis of the threaded rod (G) is parallel to the longitudinal axis of the shell (A) and is not coincident; an output shaft of the motor (F) is fixedly connected with the right end of the threaded rod (G); the tail ring piece (E) is fixedly connected with the tail support (D) in a gluing mode, and an inner rail (16) of the tail ring piece is movably connected with an annular groove (n) at the right part of the threaded rod (G); the axial line of the pin I (17) of the shell (A), the center support (B), the variable position sensor group (C), the tail support (D), the tail ring piece (E) and the rotary pin (H) is overlapped, the axial line of the threaded rod (G) and the axial line of the pin II (18) of the rotary pin (H) are overlapped, and the two axial lines are parallel to each other, and the distance is 1-3mm.
2. A gas detector having a biomimetic cavity and a variable position sensor as recited in claim 1, wherein: the shell (A) is formed by sequentially connecting a front section (I), a second section (II), a third section (III) and a fourth section (IV), the total length L1 of the shell (A) is 100-150mm, and the thickness h1 of the shell (A) is 6-12mm; wherein the second section (II), the third section (III) and the fourth section (IV) are round tubes; the length L4 of the second section (II) is 40-75mm, and the diameter d3 is 46-56mm; the length L3 of the three sections (III) is 40-55mm, the diameter d is 60-68mm, six grooves of the groove group (1) which are uniformly distributed along the circumference are arranged on the inner wall of the three sections (III), and the width h2 of the grooves is 3-5mm; the length L2 of the four sections (IV) is 40-55mm, and the diameter d1 is 60-80mm; the diameter d4 of the left end of the front section (I) is 4-8mm, the peripheral outline of the front section (I) is obtained by rotating an a-b curve along the longitudinal axis of the shell (A) for one circle, and the mathematical expression of the a-b curve is as follows: when the point b is taken as an origin, a straight line passing through the point b and parallel to the longitudinal axis of the shell A is taken as an x-axis, the right direction is taken as an x-axis positive direction, the point b is passed through and perpendicular to the x-axis is taken as a y-axis, and a coordinate system is established upwards for the y-axis positive direction, the expression is as follows:
y=1.7×10 -3 x 3 —7.3×10 -2 x 2 ＋6.3×10 -2 x—0.207。
3. a gas detector having a biomimetic cavity and a variable position sensor as recited in claim 1, wherein: the center support (B) consists of a support leg group (6), a slide rail group (5) and a guide plate group (3), wherein the guide plate group (3), the slide rail group (5), the independent sensor (8) and the support leg group (6) are sequentially arranged from left to right, the right ends of five slide rails of the slide rail group (5) are fixedly connected with the right end of the guide plate group (3), three support plates of the support plate group (4) are uniformly distributed on the outer circumference of the guide plate group (3), and a sensor placing hole (2) is formed in the center of the left end of the guide plate group (3); the independent sensor (8) is fixedly connected to the center line of the upper surface of the wide guide rail of the sliding rail set (5), the distance L7 between the left end of the independent sensor (8) and the right end of the guide plate set (3) is 5-9mm, the size of a circular tube of the independent sensor (8) is the same as that of a circular tube (13) of the variable position sensor set (C), the inner diameter of the circular tube is 9-12mm, and the width of the circular tube is 5-10mm; the central axis of the sensor mounting hole (2) coincides with the central axis of the gas detector, and the diameter d 2 8-12mm long with a diameter of 0.75 times; the outer edge of the center of the left end of the guide plate group (3) is provided with a guide ring (7) with a fusiform section; the length L of the deflector group (3) 1 15-30mm, radius r of its outer layer rotary structure 2 Radius r of the middle layer rotary structure of 14-22mm 1 Is 12-18mm and contains a center thickness L 6 A guide ring (7) with a fusiform cross section of 2-4 mm.
4. A gas detector having a biomimetic cavity and a variable position sensor as recited in claim 1, wherein: the variable position sensor group (C) consists of five sensors, the sensors are in a circular tube shape, and a base (14) is arranged outside the circular tube (13); the inner diameter of the round tube (13) is 9-12mm, and the width is 5-10mm.
5. A gas detector having a biomimetic cavity and a variable position sensor as recited in claim 1, wherein: the total length of the tail support (D) is 40-55mm, the tail support consists of a six-edge pipe, a sensor group (12) and a flow guide support plate group (11), a through hole (9) is arranged in the center of the tail support (D), and the diameter of the tail support is 6-9mm; six blind holes with the length of 5-7mm are formed in the left end pipe wall and fixedly connected with the support leg groups (6) of the center support (B); the flow guide support plate group (11) is 25-32mm long, 1-3mm wide and 23-28mm high, and comprises six flow guide support plates with chamfer diameters of 1-3mm, wherein the six flow guide support plates are uniformly distributed on six edges of the left part of a six-edge pipe, the included angle alpha is 60 degrees, three sensors of the sensor group (12) are uniformly distributed on three edges of the right part of the six-edge pipe, the circle center of each sensor is 10-15mm high, the diameter is 8-10mm, and the wall thickness is 1-2mm.
6. A gas detector having a biomimetic cavity and a variable position sensor as recited in claim 1, wherein: the width of the tail ring piece (E) is 2-3mm, the inner rail (16) is a 300-degree annular through hole, and the distance between the central line of the inner rail and the axis of the tail ring piece (E) is 1-3mm.
7. A gas detector having a biomimetic cavity and a variable position sensor as recited in claim 1, wherein: the diameter of the pin I (17) and the diameter of the pin II (18) of the rotary pin (H) are 1-1.5mm, and the length of the pin I and the pin II is 2-4mm; the pin I (17) is parallel to the axis of the pin II (18), and the distance is 1-3mm; the total length of the rotary pin is 4-8mm.
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| CN109374363A (en) * | 2018-12-25 | 2019-02-22 | 同方威视技术股份有限公司 | A kind of electronic nose sampler |
| CN109633096B (en) * | 2018-12-30 | 2021-09-03 | 盐城工学院 | Double-air-chamber electronic nose |
| CN114624307B (en) * | 2020-12-11 | 2023-04-28 | 西安电子科技大学 | Gas sensor cavity based on hydrodynamics |
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