CN205301301U - Bionical electron nose of gas -liquid separation - Google Patents

Abstract

A bionic electronic nose for gas-liquid separation belongs to the technical field of mechanical engineering. In the utility model, the large circle of the conical body of the bionic separator A is connected with the large circle of the conical body of the air intake section in the gas chamber shell; The thread is connected with the internal thread of the detection section in the gas chamber; the sensor array is fixed in the detection section of the gas chamber, and is located in the front of the rear spoiler section of the turbulent body; the bionic structural unit is set on the side surface of the conical body of the bionic separator The length direction of the mid-floor is arranged along the circumferential direction of the conical body side surface of the bionic separator, the width direction of the mid-floor of the bionic structural unit is arranged along the generatrix direction of the conical body of the bionic separator, the main spoiler column I and the main spoiler in the bionic structural unit The direction of the tail of column II, auxiliary spoiler column group I and auxiliary spoiler column group II is consistent with the airflow direction; the utility model can improve the separation efficiency of gas and liquid, the detection accuracy and sensitivity of the sensor, and also expand the measurement range of the sensor .

Description

A bionic electronic nose for gas-liquid separation

technical field

The utility model belongs to the technical field of mechanical engineering, in particular to a gas-liquid separation bionic electronic nose.

Background technique

Downhole detection while drilling is a major development trend in the mud logging industry, and sensor technology is an important link to realize measurement while drilling and automatic control. In view of the excellent performance of electronic noses in food, medicine, agriculture, environmental monitoring, public safety and other fields, it will be a promising research direction to apply electronic nose technology to detection while drilling. During the detection-while-drilling process, the efficient separation of downhole oil and gas from drilling fluid and high-precision measurement are the keys to successful oil and gas detection.

The fine hairs distributed in arrays on the surface of the lobster's olfactory organs have the function of separating the odor molecules contained in the liquid, and then capture the chemical signals caused by the odor molecules through the sensitive substances on its surface, which has the characteristics of high sensitivity and high efficiency.

Different gas chamber structures will have a significant impact on the response speed and response value of the gas sensor. The cat's olfactory response is affected by the triple effect of the gas concentration in the surrounding environment, as well as the form and velocity of airflow in the nasal cavity, which in turn is affected by the structure of the nasal cavity. After long-term evolution, cats have a relatively complete nasal structure and sense of smell. Therefore, it is of great significance to design the structure of the gas sensor in a bionic manner, following the structure and function of the cat's nasal cavity.

Contents of the invention

The utility model designs a bionic separator in imitation of the surface structure of the lobster's olfactory organ, improves the separation efficiency of gas and liquid, imitates the structure and function of the cat's nasal cavity to carry out a bionic design on the structure of the gas chamber, and improves the detection accuracy and sensitivity of the sensor through the bionic design , also expands the measuring range of the sensor.

The utility model is composed of a bionic separator A, a gas chamber B, a sensor array C and a turbulent body D, wherein the large circle of the conical body of the bionic separator A is connected with the large circle of the conical body of the air intake section 3 in the gas chamber shell B; the turbulent body The external thread 10 of the rear spoiler section 11 in D is threadedly connected with the internal thread 7 of the detection section 6 in the gas chamber B; the sensor array C is fixed in the detection section 6 of the gas chamber B, and is located at the rear spoiler of the spoiler D Section 11 front portion; the length direction of the bottom plate 16 in the bionic structure unit E set on the side surface of the bionic separator A is arranged circumferentially along the side surface of the cone body of the bionic separator A, and the width direction of the bottom plate 16 in the bionic structure unit E Arranged along the direction of the generatrices of the conical frustum of the bionic separator A, the orientation of the tails of the main spoiler column I15, the main spoiler column II18, the auxiliary spoiler column group I14 and the auxiliary spoiler column group II17 in the bionic structure unit E is consistent with the airflow direction.

The biomimetic separator A is a hollow frustum, the diameter d _of the large circle of the frustum is 20-30mm, the diameter _d2 of the small circle of the frustum is 5-8mm, and the height L _of the frustum is 30-45mm; the small round end of the frustum is In a closed state, there are no bionic structural units E and semipermeable membrane 1 on the outer surface; the adjacent bionic structural units E are aligned along the generatrix direction and the circumferential direction of the surface of the circular frustum, and the centers of two adjacent rows of bionic structural units E are aligned along the circular frustum The distance h ₁₅ in the direction of the generatrix of the body surface is 300um, and the distance L ₁₄ along the circumferential direction of the surface of the frustum is _1000um ; The surface is equipped with a bionic structure unit E, and the air holes 2 are evenly distributed on the side wall of the conical body. The air holes 2 are cylindrical, and their diameter d12 is _20-30um . The arrangement of the units is corresponding, and each bionic structural unit is symmetrically distributed along the direction of the generatrix of the conical frustum with three groups of air holes 2, and the distance L12 between two adjacent groups of air holes ₂ is 100um; each group of 5-7 air holes 2 is in the The distribution is symmetrical and uniform in the circumferential direction, and the center-to-center distance L ₁₃ of two adjacent air holes 2 is 60-80um.

The gas chamber B is composed of an intake section 3, a transmission section 4, a diffusion section 5 and a detection section 6, and the intake section 3, the transmission section 4, the diffusion section 5 and the detection section 6 are sequentially connected from left to right; Section 3, transmission section 4, diffusion section 5 and detection section 6 have a wall thickness h2 of 2-3mm; the air intake section ₃ is a frustum of cone, wherein the diameter of the large circle of the frustum of the cone is _20-30mm , and the diameter of the small circle of the frustum of the cone is 20-30mm. d ₄ is 5-8mm, the height h ₄ of the frustum is 7-10mm; the transmission section 4 is a hollow cylinder, and the diameter of the cylinder is the same as the diameter d ₄ of the small circle of the frustum in the air intake section 3, and the height L ₃ of the cylinder is 15-20mm ; Diffusion section 5 is a frustum of conical body, wherein the diameter of the large circle of the frustum of the frustum _d3 is _20-30mm , the diameter of the small circle of the frustum of the conical body is the same as that of the small circle of the frustum of the air intake section ₃ , and the height h3 of the frustum of the conical body is 4-6mm; Section 6 is a hollow cylinder, the outer diameter of the cylinder is the same as the diameter _d3 of the frustum of the diffusion section ₅ , and the length L2 of the cylinder is 50-60mm; the right part of the detection section 6 is provided with an internal thread 7.

The structure of the gas chamber B adopts the design of the imitation cat nose flow channel. The air inlet section 3 adopts a circular frustum to increase the contact area between the air inlet and the air source so as to capture more odor molecules; reduce the transmission section 4 The cross-sectional area is beneficial to increase the transmission speed of the gas and the kinetic energy of the airflow, so as to form a turbulent flow in the detection section 6 and the turbulent fluid, increase the contact area between the gas molecules and the sensitive element, and improve the measurement accuracy.

The sensor array C is composed of 4-6 sensors, uniformly distributed on the inner wall of a cross-section of the detection section 6 in the gas chamber B, and the cross-section is located at the front end of the disturbance body D, and each sensor passes through the sensor probe and the external The signal conversion circuit is connected.

The spoiler D is composed of a front spoiler section 8, a rear spoiler section 11 and an adjustment column 12, the front spoiler section 8 is located at the front, the rear spoiler section 11 is located at the middle, and the adjustment column 12 is located at the rear; The flow section 8 is a cone, the diameter of the cone bottom circle d ₈ is 10-20mm, the height of the cone h ₅ is 5-7mm; the rear spoiler section 11 is a cylinder, the diameter of the cylinder d ₆ is 20-30mm, and the height of the cylinder h ₆ 10-15mm, 8-24 spoiler holes 9 are arranged on the near edge of the cylinder, the spoiler holes 9 are evenly distributed along a circle whose diameter _d9 is 10-13mm, the diameter d10 of the spoiler holes ₉ is 2mm, and the edge of the cylinder is provided with The external thread 10; the adjusting column 12 is a cylinder, the diameter d7 of the cylinder is 10-15mm, the height L4 of the cylinder is _35-50mm , and the rear end of the cylinder is provided with a groove ₁₃ .

By rotating the groove 13 at the rear end of the adjustment column 12, the position of the turbulent body D can be adjusted to obtain an optimal airflow state at the sensitive element, thereby improving the measurement accuracy of the sensor.

The bionic structural unit E is composed of the main spoiler column I15, the main spoiler column II18, the auxiliary spoiler column group I14, the auxiliary spoiler column group II17 and the bottom plate 16, wherein the auxiliary spoiler column group I14 and the auxiliary spoiler column Group II17 is composed of ten spoiler columns, which are arranged in a row. The length L ₇ of auxiliary spoiler group I14 and auxiliary spoiler group II17 is 750um, and auxiliary spoiler group I14 and auxiliary spoiler group The distance h ₈ between II17 is 90um; the main spoiler I15 and main spoiler II18 are symmetrically located on both sides of the center line, and the distance L8 between main spoiler I15 and main spoiler II18 is _700um ; the main spoiler I15 and main spoiler The diameter d ₁₀ of the column II18 is 50um, the length L11 of the main spoiler column I15 and the main spoiler II18 is _800-850um ; the diameter L6 of the auxiliary spoiler column is 25um _; the length L10 of the auxiliary spoiler column is _750um ; the bottom plate 16 is a rectangle, the base plate length L ₉ is 1000um, the base plate width h ₇ is 300um; the angle β between the main spoiler column I15 and the main spoiler column II18 and the base plate 16 is 39°; the auxiliary spoiler column group I14 and the auxiliary spoiler column The angle α between the group II 17 and the bottom plate 16 is 50°.

The beneficial effects of the utility model are:

(1) The bionic separator is designed in imitation of the surface structure of the lobster's olfactory organ, which improves the separation efficiency of gas and liquid.

(2) The bionic design of the structure of the gas chamber is carried out in imitation of the structure and function of the cat's nasal cavity. Through the bionic design, the detection accuracy and sensitivity of the sensor are improved, and the measurement range of the sensor is also expanded.

Description of drawings

Figure 1 is a schematic diagram of the gas-liquid separation bionic electronic nose

Figure 2 is a schematic diagram of the structure of the bionic separator

Figure 3 is a schematic diagram of the structure of the gas chamber

Figure 4 is the front view of the spoiler

Figure 5 is the right view of the spoiler

Figure 6 is a top view of the bionic structural unit

Figure 7 is a three-dimensional view of the bionic structural unit

Figure 8 is a schematic diagram of the spoiler angle

Figure 9 is a schematic diagram of the arrangement of bionic structural units and air holes

Among them: A. Bionic separator B. Gas chamber C. Sensor array D. Disruptor E. Bionic structure unit 1. Semi-permeable membrane 2. Breathing hole 3. Air intake section 4. Transmission section 5. Diffusion section 6. Detection section 7. Internal thread 8. Front spoiler section 9. Spoiler hole 10. External thread 11. Rear spoiler section 12. Adjusting column 13. Groove 14. Auxiliary spoiler column group I 15. Main spoiler column I 16. Bottom plate 17 .Auxiliary spoiler group II 18. Main spoiler II

detailed description

Below in conjunction with accompanying drawing, the utility model is described in further detail:

The utility model designs a bionic separator in imitation of the surface structure of the lobster's olfactory organ, improves the separation efficiency of gas and liquid, imitates the structure and function of the cat's nasal cavity to carry out a bionic design on the structure of the gas chamber, and improves the detection accuracy and sensitivity of the sensor through the bionic design , also expands the measuring range of the sensor.

As shown in Figure 1, a bionic electronic nose for gas-liquid separation is composed of a bionic separator A, a gas chamber B, a sensor array C, and a disturber D, wherein the large circle of the bionic separator A is connected to the gas chamber housing B. The conical frustum of the gas section 3 is connected in a large circle; the external thread 10 of the rear spoiler section 11 in the turbulent body D is threadedly connected with the internal thread 7 of the detection section 6 in the gas chamber B; the sensor array C is fixedly connected to the detection section 6 of the gas chamber B and located at the front of the rear spoiler section 11 of the spoiler D.

As shown in Figures 2, 6, and 7, the length direction of the bottom plate 16 of the bionic structure unit E provided on the side surface of the bionic separator A is arranged along the circumferential direction of the side surface of the bionic separator A, and in the bionic structure unit E The width direction of the bottom plate 16 is arranged along the direction of the generatrix of the conical body of the bionic separator A. In line with the direction of airflow.

As shown in Figures ₂ and 9, the bionic separator A is a hollow frustum, the diameter d _of the large circle of the frustum is 20-30 mm, the diameter d of the small circle of the frustum is 5-8 mm, and the height L _of the frustum is 30-30 mm. 45mm; the small round end of the frustum is in a closed state, and there are no bionic structural units E and semi-permeable membrane 1 on its outer surface; the adjacent bionic structural units E are aligned along the generatrix direction and the circumferential direction of the surface of the conical frustum, and there are two adjacent rows The distance h ₁₅ between the center of the bionic structural unit E along the generatrix direction of the surface of the frustum is 300um, and the distance L ₁₄ along the circumferential direction of the surface of the frustum is 1000um.

A semi-permeable membrane 1 is provided on the inner wall of the truncated truncated body, the wall thickness h ₁ of the truncated truncated body is 1-2mm, the side surface of the truncated truncated body is provided with a bionic structure unit E, and air holes 2 are evenly distributed on the side wall of the truncated body, and the air vent 2 is a cylinder Its diameter d ₁₂ is 20-30um. The distribution of air holes 2 on the side wall of the conical body corresponds to the arrangement of the bionic structural units. The spacing L ₁₂ between two adjacent groups of air holes 2 is 100um; each group of 5-7 air holes 2 is symmetrically and evenly distributed in the circumferential direction of the frustum, and the center-to-center distance L ₁₃ of two adjacent air holes 2 is 60-80um.

As shown in Figure 3, the gas chamber B is composed of an intake section 3, a transmission section 4, a diffusion section 5 and a detection section 6, and the intake section 3, transmission section 4, diffusion section 5 and detection section 6 are from left to The right is connected sequentially; the wall thickness h ₂ of the air inlet section 3, the transmission section 4, the diffusion section 5 and the detection section 6 is 2-3mm. The air inlet section 3 is a circular frustum, and the diameter d ₅ of the large circle of the circular frustum is 20-30mm , the diameter d ₄ of the small circle of the frustum is 5-8mm, the height h ₄ of the frustum is 7-10mm; the transmission section 4 is a hollow cylinder, the diameter of the cylinder is the same as the diameter d ₄ of the small circle of the frustum in the intake section 3, and the height of the cylinder is L ₃ is 15-20mm; the diffuser section 5 is a frustum, where the diameter d ₃ of the large circle of the frustum is 20-30mm, the diameter of the small circle of the frustum is the same as the diameter d ₄ of the small circle of the frustum in the intake section 3, and the height h ₃ of the frustum 4-6mm; the detection section 6 is a hollow cylinder, the outer diameter of the cylinder is the same as the large circle diameter _d3 of the frustum of the diffusion section ₅ , and the length L2 of the cylinder is 50-60mm; the right part of the detection section 6 is provided with an internal thread 7.

As shown in Figure 1, the sensor array C is composed of 4-6 sensors, uniformly distributed on the inner wall of a cross-section of the detection section 6 in the gas chamber B, and the cross-section is located at the front end of the disturbance body D, each sensor The sensor probe is connected with an external signal conversion circuit.

As shown in Figures 4 and 5, the spoiler D is composed of a front spoiler section 8, a rear spoiler section 11 and an adjustment column 12, the front spoiler section 8 is located in the front, and the rear spoiler section 11 is located in the middle. The column 12 is located at the rear; the front spoiler section 8 is a cone, the diameter of the cone bottom circle d ₈ is 10-20mm, and the height of the cone h ₅ is 5-7mm; the rear spoiler section 11 is a cylinder, and the diameter of the cylinder d ₆ is 20-30mm, the cylinder height h ₆ is 10-15mm, 8-24 spoiler holes 9 are arranged on the near edge of the cylinder, the spoiler holes 9 are evenly distributed along a circle whose diameter d ₉ is 10-13mm, and the diameter of the spoiler holes 9 is d ₁₀ is 2mm, and the edge of the cylinder is provided with an external thread 10; the adjustment column 12 is a cylinder, the diameter d7 of the cylinder is 10-15mm, the height L4 of the cylinder is _35-50mm , and the rear end of the cylinder is provided with a groove ₁₃ .

As shown in Figures 6, 7, and 8, the bionic structural unit E is composed of main spoiler column I15, main spoiler column II18, auxiliary spoiler column group I14, auxiliary spoiler column group II17, and base plate 16, wherein the auxiliary spoiler column group The spoiler column group I14 and the secondary spoiler column group II17 are each composed of ten spoiler columns, and each is arranged in a row. The length _L7 of the secondary spoiler column group I14 and the secondary spoiler column group II17 is 750um. The distance h ₈ between the spoiler group I14 and the auxiliary spoiler group II17 is 90um; the main spoiler group I15 and the main spoiler group II18 are symmetrically located on both sides of the center line, and the distance L8 between the main spoiler group I15 and the main spoiler group II18 is _700um The diameter d ₁₀ of the main spoiler column I15 and the main spoiler column II18 is 50um, and the length L11 of the main spoiler column I15 and the main spoiler II18 is _800-850um ; the diameter L6 of the auxiliary spoiler column is 25um _; Spoiler column length L ₁₀ is 750um; base plate 16 is rectangular, base plate length L ₉ is 1000um, base plate width h ₇ is 300um; the angle β between main spoiler column I15 and main spoiler column II18 and base plate 16 is 39°; The included angle α between the spoiler column group I14 and the auxiliary spoiler column group II17 and the bottom plate 16 is 50°.

Working process and principle of the present utility model:

The bionic separator of the gas-liquid separation bionic electronic nose is placed in the liquid containing the gas to be measured to ensure the sealing of the gas-liquid separation bionic electronic nose, prevent the liquid from entering the electronic nose, and make the flow of the liquid consistent with the gas chamber The flow direction of the gas is consistent. After being separated by the bionic separator, the gas to be tested enters the detection section through the intake section, transmission section, and diffusion section; under the action of the disturbing fluid, the airflow forms a turbulent flow at the sensitive element and fully contacts with the sensitive element. The reaction takes place and then flows out of the gas chamber housing through the spoiler hole.

Claims (6)

1. A gas-liquid separation bionic electronic nose is characterized in that it is made up of a bionic separator (A), a gas chamber (B), a sensor array (C) and a disturbance body (D), wherein the circular platform of the bionic separator (A) The large circle of the body is connected with the large circle of the conical body of the air inlet section (3) in the gas chamber housing (B); The internal thread (7) of the section (6) is threaded; the sensor array (C) is fixed in the detection section (6) of the gas chamber (B), and is located in front of the rear spoiler section (11) of the spoiler (D) Part; the length direction of the bottom plate (16) in the bionic structure unit (E) set on the side surface of the conical body of the bionic separator (A) is arranged circumferentially along the side surface of the conical body of the bionic separator (A), and the bionic structure unit (E ) The width direction of the mid-bottom plate (16) is arranged along the generatrix direction of the conical body of the bionic separator (A), the main spoiler column I (15), the main spoiler column II (18), the secondary spoiler column in the bionic structure unit (E) The orientation of the tails of the flow column group I (14) and the secondary spoiler column group II (17) is consistent with the airflow direction. 2. by the gas-liquid separation bionic electronic nose of claim 1, it is characterized in that described bionic separator (A) is a hollow circular frustum body, and the large circle diameter d _of the circular frustum body is 20-30mm, and the small circle diameter d of the circular frustum body ₂ is 5-8mm, and the height L _of the conical frustum is 30-45mm; the small round end of the conical frustum is in a closed state, and its outer surface does not have a bionic structural unit (E) and a semipermeable membrane (1); the adjacent bionic structural unit ( E) Arranged in alignment along the generatrix direction and the circumferential direction of the surface of the frustum, and the distance _h15 between the centers of two adjacent rows of bionic structural units (E) along the generatrix direction of the surface of the frustum is 300um, and the distance L along the circumferential direction of the surface of the frustum ₁₄ is 1000um; A semi-permeable membrane (1) is provided on the inner wall of the truncated body, the wall thickness h ₁ of the truncated body is 1-2mm, the side surface of the truncated body is provided with a bionic structural unit (E), and the side wall of the truncated body is evenly distributed with air holes (2) , the ventilation hole (2) is cylindrical, and its diameter d ₁₂ is 20-30um, the distribution of the ventilation hole (2) on the side wall of the conical body corresponds to the arrangement of the bionic structural units, and each bionic structural unit is along the generatrix of the conical body There are three groups of air holes (2) symmetrically distributed in the direction, and the distance L12 between two adjacent groups of air holes ( ₂ ) is 100um; each group of 5-7 air holes (2) is symmetrically and evenly distributed in the circumferential direction of the frustum of the cone, and two phases The center-to-center distance L ₁₃ between adjacent air holes (2) is 60-80um. 3. by the gas-liquid separation bionic electronic nose of claim 1, it is characterized in that described gas chamber (B) is made up of air inlet section (3), transmission section (4), diffusion section (5) and detection section ( 6) Composition, the intake section (3), the transmission section (4), the diffusion section (5) and the detection section (6) are connected in sequence from left to right; the intake section (3), the transmission section (4), the diffusion section (5) and the wall thickness h ₂ of the detection section (6) are 2-3mm; the air inlet section (3) is a frustum of a cone, wherein the diameter _d of the large circle of the frustum of the cone is 20-30mm, and the diameter of the small circle of the frustum of the cone _d4 is 5-8mm, the height _h4 of the frustum of the cone is 7-10mm; the transmission section (4) is a hollow cylinder, wherein the diameter of the cylinder is the same as the diameter _d4 of the small circle of the frustum in the air intake section ( ₃ ), and the height L3 of the cylinder is 15- 20mm; the diffusion section (5) is a conical frustum, wherein the diameter d ₃ of the large circle of the frustum is 20-30mm, the diameter of the small circle of the frustum is the same as the diameter d ₄ of the small circle of the frustum in the air inlet section (3), and the height h ₃ of the frustum is 4-6mm; the detection section (6) is a hollow cylinder, the outer diameter of the cylinder is the same as the diameter _d3 of the frustum of the diffusion section ( ₅ ), and the length L of the cylinder is 50-60mm; the right part of the detection section (6) is provided with Internal thread (7). 4. The gas-liquid separation bionic electronic nose according to claim 1, characterized in that said sensor array (C) is made up of 4-6 sensors, and a transverse sensor of the detection section (6) is detected in the gas chamber (B). uniformly distributed on the inner wall of the section, and the cross section is located at the front end of the turbulent body (D). 5. The gas-liquid separation bionic electronic nose according to claim 1, characterized in that said spoiler (D) consists of a front spoiler section (8), a rear spoiler section (11) and an adjustment column (12) , the front spoiler section (8) is located at the front, the rear spoiler section (11) is located at the middle, and the adjustment column (12) is located at the rear; the front spoiler section (8) is a cone, and the diameter of the cone bottom circle d ₈ is 10-20mm, the cone height h ₅ is 5-7mm; the rear spoiler section (11) is a cylinder, the cylinder diameter d ₆ is 20-30mm, the cylinder height h ₆ is 10-15mm, and the near edge of the cylinder is provided with 8-24 A spoiler hole (9), the spoiler hole (9) is uniformly distributed along the circle of diameter d ₉ of 10-13mm, the spoiler hole (9) diameter d ₁₀ is 2mm, and the cylinder edge is provided with external thread (10); adjust The post (12) is a cylinder, the diameter d7 of the cylinder is 10-15mm, the height L4 of the cylinder is _35-50mm , and the rear end of the cylinder is provided with a groove ( ₁₃ ). 6. The gas-liquid separation bionic electronic nose according to claim 2, characterized in that said bionic structural unit (E) consists of main spoiler I (15), main spoiler II (18), auxiliary spoiler Column group I (14), auxiliary spoiler column group II (17) and base plate (16), wherein auxiliary spoiler column group I (14) and auxiliary spoiler column group II (17) each have ten spoiler columns The length L ₇ of auxiliary spoiler group I (14) and auxiliary spoiler group II (17) is 750um, and the auxiliary spoiler group I (14) and auxiliary spoiler group The distance h8 between II ( ₁₇ ) is 90um; the main spoiler I (15) and the main spoiler II (18) are symmetrically located on both sides of the center line, and the main spoiler I (15) and the main spoiler II (18) The distance L ₈ is 700um; the diameter d ₁₀ of the main spoiler I (15) and the main spoiler II (18) is 50um, and the length of the main spoiler I (15) and the main spoiler II (18) is L ₁₁ Both are 800-850um; the secondary spoiler column diameter L ₆ is 25um; the secondary spoiler column length L ₁₀ is 750um; the base plate (16) is rectangular, the base plate length L ₉ is 1000um, and the base plate width h ₇ is 300um; the main spoiler column The included angle β between I (15) and the main spoiler column II (18) and the base plate (16) is 39°; the auxiliary spoiler column group I (14) and the auxiliary spoiler column group II (17) and the base plate (16) The included angle α is 50°.