A vehicle-mounted gas leakage detection system

Abstract

The application relates to the technical field of air pollution detection, in particular to a vehicle-mounted gas leakage detection system which comprises a host computer and further comprises a collecting cover, an air inlet assembly and a flow guide assembly. The air inlet assembly and the flow guide assembly are arranged, the air inlet assembly is used for adaptively adjusting the air inlet amount under different vehicle speeds, sufficient air inlet amount is ensured at low vehicle speed to provide the equipment in the host computer for detection, and the air inlet assembly is used for avoiding the formation of turbulent flow at high vehicle speed, laminar flow is used to ensure that the sampled gas is representative and accurate; after the air not interfered by turbulent flow is collected, the laminar flow is converted into turbulent flow through the flow guide assembly, so that the uniformity of the gas concentration in the air is ensured, and the accuracy of the detection result is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air pollution detection, in particular to a vehicle-mounted gas leakage detection system. BACKGROUND

[0002] As a key equipment for dynamic monitoring of urban gas pipeline network, the vehicle-mounted gas leakage detection system has always focused on improving the gas sampling accuracy in mobile scenarios. At present, the mainstream technical solution is to install a gas collection device at the front end of the vehicle, and to guide the air sample into the vehicle-mounted analyzer for detection by means of the natural wind pressure generated when the vehicle is running. This solution can achieve continuous monitoring of the gas concentration along the road to a certain extent, especially it can detect methane emission points hundreds of meters away from the vehicle. However, in actual application, this technical solution has obvious work condition adaptability defects, which are embodied in the following two aspects:

[0003] Firstly, when the vehicle is running at low speed, the relative motion speed between the vehicle and the air is low, which cannot form sufficient dynamic pressure gradient, resulting in a significant reduction of the air flow rate at the inlet of the gas collection device. This phenomenon directly leads to insufficient amount of gas samples collected per unit time, which is difficult to meet the detection requirements of trace gas leakage. More seriously, the engine residual heat and environmental pollutants may cause local gas interference when the vehicle is running at low speed, further affecting the authenticity of the detection signal.

[0004] Secondly, when the vehicle is running at high speed, the violent interaction between the vehicle and the air will cause complex flow field distortion. The turbulent vortex formed around the vehicle body will cause the leaked gas to present high non-uniformity in spatial distribution, resulting in significant differences in gas concentration values at different positions at the same time. At the same time, the pressure pulsation and aerosol deposition effect of high-speed airflow in the gas collection pipeline will further cause abnormal molecular diffusion and time delay of the gas sample in the transmission process, eventually causing systematic deviation between the detection data and the actual leakage state.

[0005] Therefore, a vehicle-mounted gas leakage detection system is proposed. SUMMARY

[0006] The present application aims to provide a vehicle-mounted gas leakage detection system, which solves the problem of insufficient air intake at low vehicle speed and the formation of turbulent flow at high vehicle speed, thereby affecting the detection accuracy. By controlling the opening size and angle of the air intake area through the air intake assembly, the air intake amount is increased at low vehicle speed to compensate for the insufficient natural wind speed, and the air intake area size is reduced at high vehicle speed to accelerate the airflow through the Venturi effect, sacrificing part of the air intake amount to maintain laminar flow, thereby ensuring the accuracy of the detection results.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] The vehicle-mounted gas leakage detection system comprises a host computer, a collecting cover, an air inlet assembly and a flow guide assembly, the flow guide assembly is connected with the host computer, the collecting cover is connected with the flow guide assembly, and the air inlet assembly is connected at the front end of the collecting cover; the host computer adjusts the size of the air inlet opening of the collecting cover through the air inlet assembly according to the vehicle speed, and promotes the spiral flow of the gas before entering the host computer through the flow guide assembly.

[0009] Through the above scheme, the air inlet assembly is used to control the air inlet amount, when the automobile is running at low speed, the air inlet assembly expands the air inlet area, thereby compensating for the problem of insufficient air inlet amount caused by insufficient natural wind speed, and further ensuring the detection effect of the gas in the region at low vehicle speed; when the automobile is running at high speed, the air inlet assembly adaptively adjusts the air inlet area according to the Reynolds number, thereby avoiding the formation of turbulent flow, and accelerating the airflow through the Venturi effect, maintaining laminar flow by sacrificing a small part of the air inlet amount, so that the equipment can adapt to the detection accuracy when the vehicle is running at high speed, thereby improving the overall detection efficiency.

[0010] Preferably, the collecting cover is funnel-shaped, and the cross-sectional area thereof gradually decreases from the air inlet assembly to the flow guide assembly.

[0011] Through the above scheme, the gas is gradually pressurized and accelerated in the process of entering the flow guide assembly from the collecting cover, the gas mixing speed is accelerated through pressurization, so that the distribution of the gas in the air is more uniform, and the detection accuracy is improved.

[0012] Preferably, a sliding groove one is arranged on the front side of the collecting cover, and sliding rails are arranged on the upper and lower sides of the collecting cover; the air inlet assembly comprises an electric telescopic rod, a sliding plate, a movable shaft, a movable plate and a sliding block one, the electric telescopic rod is connected with the collecting cover, the sliding plate is connected with the sliding rail, the movable shaft is connected with the sliding plate, the movable plate is connected with the movable shaft, and the sliding block one is connected on the side of the movable plate away from the movable shaft.

[0013] Through the above scheme, the host sends a signal according to the vehicle speed, the electric telescopic rod controls the front and rear positions of the sliding plate according to the vehicle speed, and the sliding plate controls the opening size of the front end of the collecting cover through the front and rear movement of the movable shaft. When the automobile travels at low speed, the electric telescopic rod controls the movable shaft to move forward through the sliding plate, so that the two movable plates on the same movable shaft are close to each other, so that the opening size of the front end of the collecting cover gradually increases, and the air inlet area is increased, so as to compensate for the insufficient air inlet caused by insufficient natural wind speed; when the automobile travels at high speed, the electric telescopic rod controls the movable shaft to move backward through the sliding plate, so that the two movable plates on the same movable shaft are away from each other, so that the opening size of the front end of the collecting cover gradually decreases, on the one hand, the Reynolds number is reduced by reducing the air inlet area, so as to avoid the formation of turbulent flow, and then the uneven distribution of gas caused by turbulent flow near the air inlet opening can be avoided, so as to ensure the accuracy and representativeness of sampling, on the other hand, the Venturi effect is formed by the movable plate, the dynamic pressure difference generated by the vehicle speed is used to actively suck the leakage gas, the local concentration is improved, and the accuracy of gas detection is improved.

[0014] Preferably, two movable plates are connected to each movable shaft, and the two movable plates on the same movable shaft are in a "V" shape.

[0015] Through the above scheme, the inclination degree of the movable plate is controlled by the position of the movable shaft, so that the opening size of the front end of the collecting cover is adaptively adjusted, in addition, the movable plate arranged in an inclined manner can also avoid the occurrence of turbulent flow caused by direct impact of crosswind to a certain extent, so as to ensure the stability of the airflow entering the collecting cover.

[0016] Preferably, the front side of the collecting cover is also provided with a second sliding groove and a third sliding groove; the rear side of the movable plate is connected with a straight plate, the upper and lower sides of the straight plate are provided with a second sliding block and a third sliding block, and the second sliding block and the third sliding block are connected with the second sliding groove and the third sliding groove respectively.

[0017] Through the above scheme, the straight plate is always kept in front and back through the cooperation of the second sliding block, the third sliding block, the second sliding groove and the third sliding groove, and the throat in the Venturi pipe is extended through the straight plate, so as to further ensure the stability of the laminar flow, make the leaked gas stably diffuse in the laminar flow, and then make the concentration distribution uniform, and then improve the detection accuracy.

[0018] Preferably, the flow guide assembly comprises a straight pipe and an elbow pipe, the straight pipe is connected with the collecting cover, one end of the elbow pipe is connected with the straight pipe, and the other end is connected with the host, a plurality of flow guide pieces are connected in the straight pipe, and the flow guide pieces are in a spiral shape in the straight pipe.

[0019] Since the main task of the collecting cover and the air inlet assembly is to efficiently and stably collect the air sample, to ensure that the entered gas is representative and has no excessive external interference, and to accurately capture the original sample, the entered air needs to form a stable laminar flow, and the pipeline for conveying the gas aims to uniformly mix the gas to ensure that the internal concentration is uniform, therefore, through the above scheme, when the gas enters the straight pipe from the collecting cover, the gas is affected by the spiral-shaped guide vane, and the gas is converted from laminar flow to turbulent flow, so as to promote the uniform mixing of the gas and avoid concentration stratification, thereby ensuring the accuracy of the detection result.

[0020] Preferably, the overall shape of the elbow pipe is an Archimedes spiral line type spiral structure, and the overall diameter gradually increases from bottom to top.

[0021] Some particulate impurities exist in the external air, in order to avoid damage caused by the impurities entering the main machine along with the air, through the above scheme, when the gas mixed with the particulate impurities flows along the spiral-shaped elbow pipe, the fluid is forced to change direction constantly, since the mass of the particles is larger than that of the gas, the inertia of the particles is stronger, and the particles are more inclined to maintain the original movement direction, while the gas molecules are smaller in mass and are more likely to follow the flow direction, at this time, the solid particles are pushed to the inner wall of the elbow pipe by the centrifugal force and separated from the gas, and the solid particles lose kinetic energy and deposit on the surface of the channel after impacting the inner wall of the elbow pipe, finally, the clean gas enters the main machine along the elbow pipe for detection; in addition, the shape of the elbow pipe in the scheme is designed in reference to the Archimedes spiral line, which can ensure the smooth transition of the airflow and the uniformity of the gas concentration distribution during movement, thereby ensuring the accuracy of the detection result.

[0022] Preferably, a fixing block and a pull plate are arranged at the connection between the elbow pipe and the straight pipe, a limiting rod is connected to the pull plate, the limiting rod is in sliding connection with the fixing block, a reset spring is sleeved on the limiting rod, and the two ends of the reset spring are connected with the fixing block and the limiting rod respectively.

[0023] Through the above scheme, when the automobile stops moving, the particulate matters in the elbow pipe slide downward under the influence of gravity and finally slide to the area where the pull plate is located, at this time, the pull plate is pulled downward to communicate the inside of the elbow pipe with the outside, so that the particulate matters in the area fall out, and for the particulate matters in the elbow pipe that have not slid to the vicinity of the pull plate, the pull plate is only pulled downward and then released, at this time, the pull plate collides with the elbow pipe under the action of the reset spring, so as to accelerate the falling of the particulate matters in the elbow pipe, thereby realizing the cleaning of the separated particulate impurities in the elbow pipe.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] 1. The vehicle-mounted gas leakage detection system of the present application, by setting the air inlet assembly and the flow guide assembly, the air inlet assembly is used to adaptively adjust the air inlet amount under different vehicle speeds, sufficient air inlet amount is ensured at low vehicle speed to provide the equipment in the host for detection, and the air inlet assembly is used to avoid the formation of turbulent flow at high vehicle speed, and the laminar flow is used to ensure the representativeness and accuracy of the sampled gas; after the air not disturbed by the turbulent flow is collected, the flow guide assembly is used to convert the laminar flow into the turbulent flow, so as to ensure the uniformity of the gas concentration in the air, and then ensure the accuracy of the detection result.

[0026] 2. The vehicle-mounted gas leakage detection system of the present application, by setting the movable plate, the size of the opening at the front end of the collecting cover is changed by the position state of the movable plate under different vehicle speeds, the air inlet area is increased by moving the two movable plates on the same movable shaft towards each other at low vehicle speed, so as to compensate for the insufficient air inlet amount caused by insufficient natural wind speed; the air inlet area is reduced by moving the two movable plates in the opposite direction at high vehicle speed, so as to reduce the Reynolds coefficient and avoid the formation of turbulent flow, so as to ensure the accuracy and representativeness of the sampling, on the other hand, the Venturi effect is formed by the movable plate, and the dynamic pressure difference generated by the vehicle speed is used to actively suck in the leakage gas, so as to improve the local concentration, and thus improve the accuracy of the gas detection.

[0027] 3. The vehicle-mounted gas leakage detection system of the present application, by setting the straight pipe and the elbow pipe, the spiral flow guide vane in the straight pipe is used to convert the gas from laminar flow to turbulent flow, so as to promote the uniform mixing of the gas and avoid the stratification of the concentration, and thus ensure the accuracy of the detection result, and the gas forming the turbulent flow enters the elbow pipe to form the centrifugal motion, which further promotes the uniform mixing of the gas, at the same time, the centrifugal force is used to separate the particulate impurities existing in the gas, so as to ensure the purity of the detection gas, and thus ensure the accuracy of the detection result; in addition, the overall shape of the elbow pipe can also ensure the smooth transition of the airflow, so as to ensure the uniformity of the gas concentration distribution during movement, and thus ensure the accuracy of the detection result. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The structure diagram of the installation position of the air inlet assembly in the vehicle body of the present application;

[0029] Figure 2 The structure diagram of the relative position of the collecting cover, the air inlet assembly and the flow guide assembly of the present application;

[0030] Figure 3 The structure diagram of the collecting cover of the present application;

[0031] Figure 4 The structure diagram of the air inlet assembly of the present application;

[0032] Figure 5It is the structural schematic view of the movable plate and the straight plate of the present application;

[0033] Figure 6 It is the structural schematic view of the flow guide assembly of the present application;

[0034] Figure 7 It is the structural schematic view of the flow guide assembly of the present application; Figure 6 It is the enlarged view of A in the present application;

[0035] Figure 8 It is the flow path view of the gas when it enters the collecting cover through the air inlet assembly of the present application.

[0036] In the figure: 1, main machine; 2, collecting cover; 3, air inlet assembly; 301, electric telescopic rod; 302, sliding plate; 303, movable shaft; 304, movable plate; 305, sliding block one; 306, straight plate; 307, sliding block two; 308, sliding block three; 4, flow guide assembly; 401, straight pipe; 402, elbow pipe; 403, flow guide fin; 5, sliding groove one; 6, sliding rail; 7, sliding groove two; 8, sliding groove three; 9, fixed block; 10, pull plate; 11, limiting rod; 12, reset spring. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present application.

[0038] Please refer to Figures 1 to 8 The present application provides a vehicle-mounted gas leakage detection system, and the technical solutions are as follows:

[0039] Specifically, please refer to Figure 1 , Figure 2 and Figure 3The application discloses a vehicle-mounted gas leakage detection system which comprises a host computer 1, a gas analyzer for detecting gas concentration arranged in the host computer 1, a gas sensor for detecting gas arranged in the gas analyzer, a methane plume characteristic (size, emission amount, concentration, ethane content and the like) in the collected gas measured by the gas sensor, and a position, a flow rate and a relative risk (i.e. indication of whether it is possible to come from a dangerous leakage) of a leakage indication predicted by the host computer 1 through risk ranking and emission quantization analysis, so that the host computer 1 calculates and positions a rough area of the gas leakage. The vehicle-mounted gas leakage detection system further comprises a collecting cover 2, an air inlet assembly 3 and a flow guide assembly 4. The flow guide assembly 4 is connected with the host computer 1, the collected gas through the air inlet assembly 3 is delivered into the gas analyzer in the host computer 1 through the flow guide assembly 4, the collecting cover 2 is connected with the flow guide assembly 4, the collecting cover 2 is funnel-shaped, and the cross-sectional area of the collecting cover 2 gradually decreases from the air inlet assembly 3 to the flow guide assembly 4, so that the gas is gradually pressurized and accelerated in the process of entering the flow guide assembly 4 from the collecting cover 2, thereby making the gas distribution in the air more uniform and improving the detection accuracy. The air inlet assembly 3 is connected to the front end of the collecting cover 2, and the air inlet assembly 3 is used to control the air inlet amount. When the automobile is running at a low speed, the air inlet area is expanded through the air inlet assembly 3 to increase the air inlet amount, and when the automobile is running at a high speed, the formation of turbulent flow is inhibited through the air inlet assembly 3, so that the quality of sampling is ensured.

[0040] As an embodiment of the application, referring to Figure 2 、 Figure 3 、 Figure 4 and Figure 5 , the upper and lower sides of the inner wall of the front side of the collecting cover 2 are both provided with a sliding groove 5 which is long strip-shaped, and the upper and lower sides of the collecting cover 2 are both provided with a sliding rail 6; the air inlet assembly 3 comprises an electric telescopic rod 301, a sliding plate 302, a movable shaft 303, a movable plate 304 and a sliding block 305, the electric telescopic rod 301 is connected with the collecting cover 2, the sliding plate 302 is connected with the sliding rail 6, the movable shaft 303 is connected with the sliding plate 302, the front and back positions of the sliding plate 302 are automatically controlled by the electric telescopic rod 301 according to the vehicle speed, and the opening size of the front end of the collecting cover 2 is controlled by the front and back movement of the movable shaft 303 through the sliding plate 302; when the automobile is running at a low speed, the movable shaft 303 is controlled to move forward by the electric telescopic rod 301 through the sliding plate 302, and when the automobile is running at a high speed, the movable shaft 303 is controlled to move backward by the electric telescopic rod 301 through the sliding plate 302.

[0041] The movable plate 304 is connected with the movable shaft 303, two movable plates 304 are connected on each movable shaft 303, and the two movable plates 304 on the same movable shaft 303 are in a V shape, the inclination degree of the movable plate 304 is controlled through the position of the movable shaft 303, so that the opening size of the front end of the collecting cover 2 is adaptively adjusted, the movable plate 304 is made of aluminum alloy, and the surface thereof is anodized, so that the light weight and the anti-cavitation ability are considered; the sliding block one 305 is connected on the side of the movable plate 304 away from the movable shaft 303, and the sliding block one 305 is in sliding connection with the sliding groove one 5;

[0042] The collecting cover 2 is also provided with the sliding groove two 7 and the sliding groove three 8, the sliding groove two 7 and the sliding groove three 8 are parallel to the sliding groove one 5 and have equal lengths, and the front-to-back sequence thereof is the sliding groove one 5, the sliding groove two 7 and the sliding groove three 8; the straight plate 306 is connected on the rear side of the movable plate 304, the sliding block two 307 and the sliding block three 308 are arranged on the upper side and the lower side of the straight plate 306, the sliding block two 307 and the sliding block three 308 are connected with the sliding groove two 7 and the sliding groove three 8 respectively, the straight plate 306 is always kept in the front-to-back direction through the sliding block two 307 and the sliding block three 308, the stability of the laminar flow is further ensured through the straight plate 306, and the detection accuracy is improved.

[0043] As one embodiment of the application, referring to Figure 6 and Figure 7 , the flow guide assembly 4 comprises a straight pipe 401 and a bent pipe 402, the straight pipe 401 is connected with the collecting cover 2, one end of the bent pipe 402 is connected with the straight pipe 401, and the other end is connected with the host 1, a plurality of flow guide pieces 403 are connected in the straight pipe 401, the flow guide pieces 403 are in a spiral shape in the straight pipe 401, when the gas enters the straight pipe 401 from the collecting cover 2, the gas is converted from laminar flow to turbulent flow under the influence of the spiral-shaped flow guide pieces 403, so that the gas is uniformly mixed, and stratification of the concentration is avoided; the overall shape of the bent pipe 402 is an Archimedes spiral shape, which can ensure the smooth transition of the gas flow, so as to ensure the uniformity of the gas concentration distribution during movement, and the accuracy of the detection result is ensured, and the overall diameter of the bent pipe 402 gradually increases from bottom to top, the centrifugal force of the gas moving in the bent pipe 402 is used to separate the particulate impurities in the gas, so as to ensure the accuracy of the detection;

[0044] The connecting part of the elbow pipe 402 and the straight pipe 401 is provided with a fixed block 9 and a pull plate 10, the pull plate 10 is provided with a through slot close to the lower side, a worker can put his fingers into the through slot to pull the pull plate 10, pulling the pull plate 10 downward can make the inside of the elbow pipe 402 communicate with the outside, so that the particulate matters in the area fall out; the pull plate 10 is connected with a limiting rod 11, the limiting rod 11 is in sliding connection with the fixed block 9, a reset spring 12 is sleeved on the limiting rod 11, and the two ends of the reset spring 12 are connected with the fixed block 9 and the limiting rod 11 respectively, the pull plate 10 is pulled downward and loosened, at this time, the pull plate 10 collides with the elbow pipe 402 under the action of the reset spring 12, so that the un-fallen impurities fall faster, thereby realizing the cleaning of the particulate matters separated out in the elbow pipe 402.

[0045] The specific working principle is: in the technical requirements of the vehicle-mounted gas leakage detection device, on the one hand, the collected air sample must be representative, avoid uneven gas distribution caused by turbulence near the air inlet area, avoid gas stratification, and make it forced mixing and homogenization, so as to ensure the accuracy of sampling; on the other hand, the gas entering the detection device in the main machine 1 must be mixed uniformly, therefore, different concentrations of gas can be mixed by appropriate turbulence, so that the gas entering the analyzer in the main machine 1 is more uniform, thereby reducing the detection error, so that the gas leakage area can be detected in time, and the air pollution detection function is realized.

[0046] Therefore, in the gas collection stage, the gas entering the collection cover 2 is formed into stable laminar flow by the air inlet assembly 3, the air sample is collected efficiently and stably, the entering gas is ensured to be representative, there is no excessive external interference, and the original sample is accurately captured; and in the gas conveying stage, the sampling gas is converted from stable laminar flow into turbulent flow by the flow guide assembly 4, so that different concentrations of gas are mixed, the gas concentration distribution is more uniform, and the detection error is reduced.

[0047] Specifically, in the gas collection stage, when the automobile is in a low-speed driving state, the natural wind speed is insufficient to cause insufficient air intake, in order to avoid affecting the detection result, the main machine 1 sends a signal to the electric telescopic rod 301, at this time, the electric telescopic rod 301 controls the movable shaft 303 to move forward through the sliding plate 302, so that the two movable plates 304 on the same movable shaft 303 move close to each other, so that the size of the opening at the front end of the collection cover 2 gradually increases, thereby increasing the air inlet area, and thereby ensuring that sufficient gas enters the main machine 1 for detection, thereby ensuring the reliability of the detection result when the automobile is in a low-speed driving state.

[0048] When the automobile is running at high speed, at this time due to the gas flow rate is too fast, so that the Reynolds coefficient increases, thus prone to turbulence, and turbulence can produce vortex near the intake area, and the outside air entrainment dilution leakage gas, thereby reducing the representative and accuracy of the collected gas; in order to avoid this situation, when the automobile is running at high speed, the main machine 1 sends a signal to the electric telescopic rod 301, at this time the electric telescopic rod 301 controls the active shaft 303 to move backward through the slide plate 302, so that the two movable plates 304 on the same active shaft 303 move away from each other, so that the size of the opening at the front end of the collection cover 2 gradually decreases, on the one hand, the Reynolds coefficient is reduced by reducing the intake area, thereby avoiding the formation of turbulence, on the other hand, the movable plate 304 forms a Venturi effect, and the dynamic pressure difference generated by the vehicle speed is used to actively suck in the leakage gas, thereby improving the local concentration and improving the accuracy of the gas detection.

[0049] In the gas conveying stage, the collected gas enters the straight pipe 401 through the collection cover 2 and contacts the spiral guide vane 403, and the gas gradually changes from laminar flow to turbulent flow under the action of the guide vane 403, thereby promoting uniform mixing of the gas and avoiding stratification of the concentration; in addition, in order to avoid the influence of particulate impurities in the gas on the detection result and damage the detection instrument, when the gas moves in the spiral bend pipe 402, due to the difference in mass and inertia between solids and gas, the particulate impurities will gradually separate from the gas and deposit on the wall of the bend pipe 402, so that the clean gas enters the main machine 1 for detection, thereby ensuring the accuracy of the detection result.

[0050] When the automobile stops moving, the particulate matter in the bend pipe 402 slides under the influence of gravity to the position of the pull plate 10, at this time the worker pulls down the pull plate 10 to make the inside of the bend pipe 402 communicate with the outside, so that the impurities are discharged from the bend pipe 402, in order to avoid that part of the impurities are not discharged from the bend pipe 402 in time, the worker only needs to pull down the pull plate 10 and loosen, at this time the pull plate 10 collides with the bend pipe 402 under the action of the return spring 12, thereby accelerating the falling of the particulate matter in the bend pipe 402, then the pull plate 10 is pulled down again, thereby realizing the cleaning of the particulate impurities separated out from the bend pipe 402.

[0051] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A vehicle mounted gas leak detection system comprising a host (1) characterised in that: It also includes a collection cover (2), an air inlet assembly (3) and a flow guide assembly (4), the flow guide assembly (4) is connected with the main machine (1), the collection cover (2) is connected with the flow guide assembly (4), and the air inlet assembly (3) is connected at the front end of the collection cover (2); the main machine (1) adjusts the air inlet opening size of the collection cover (2) through the air inlet assembly (3) according to the vehicle speed, and promotes the spiral flow of the gas before entering the main machine (1) through the flow guide assembly (4); The collection cover (2) is funnel-shaped, and the cross-sectional area thereof gradually decreases from the air inlet assembly (3) to the flow guide assembly (4); The front side of the collection cover (2) is provided with a sliding groove one (5), and the upper and lower sides of the collection cover (2) are both provided with sliding rails (6); the air inlet assembly (3) comprises an electric telescopic rod (301), a sliding plate (302), a movable shaft (303), a movable plate (304) and a sliding block one (305), the electric telescopic rod (301) is connected with the collection cover (2), the sliding plate (302) is connected with the sliding rail (6), the movable shaft (303) is connected with the sliding plate (302), the movable plate (304) is connected with the movable shaft (303), and the sliding block one (305) is connected on the side of the movable plate (304) away from the movable shaft (303).

2. The vehicle-mounted fuel gas leakage detection system according to claim 1, characterized in that: Two movable plates (304) are connected on each movable shaft (303), and the two movable plates (304) on the same movable shaft (303) are in a "V" shape.

3. The vehicle-mounted fuel gas leakage detection system according to claim 1, characterized in that: The front side of the collection cover (2) is also provided with a sliding groove two (7) and a sliding groove three (8); the rear side of the movable plate (304) is connected with a straight plate (306), the upper and lower sides of the straight plate (306) are both provided with a sliding block two (307) and a sliding block three (308), and the sliding block two (307) and the sliding block three (308) are connected with the sliding groove two (7) and the sliding groove three (8) respectively.

4. The on-board fuel gas leak detection system of claim 1, wherein: The flow guide assembly (4) comprises a straight pipe (401) and an elbow pipe (402), the straight pipe (401) is connected with the collection cover (2), one end of the elbow pipe (402) is connected with the straight pipe (401), and the other end is connected with the main machine (1), a plurality of flow guide fins (403) are connected in the straight pipe (401), and the flow guide fins (403) are in a spiral shape in the straight pipe (401).

5. The on-board vehicle fuel gas leak detection system of claim 4, wherein: The overall shape of the elbow pipe (402) is an Archimedes spiral spiral structure, and the overall diameter thereof gradually increases from bottom to top.

6. The on-board vehicle fuel gas leak detection system of claim 4, wherein: The connecting position of the elbow pipe (402) and the straight pipe (401) is provided with a fixed block (9) and a pull plate (10), a limiting rod (11) is connected on the pull plate (10), the limiting rod (11) is connected with the fixed block (9) in a sliding mode, a reset spring (12) is sleeved on the limiting rod (11), and the two ends of the reset spring (12) are connected with the fixed block (9) and the limiting rod (11) respectively.

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