A portable explosive detector

Abstract

The utility model provides a kind of portable explosive detector, the portable explosive detector includes machine body, heating head subassembly, detection component, ventilation pipe, heating head subassembly is arranged at one end of the machine body, heating cavity is formed in the heating head subassembly, detection component is located in the machine body, the ventilation pipe includes inner tube and outer tube, the outer tube is sleeved in the inner tube, the inner periphery of the outer tube and the outer periphery of the inner tube define into inlet air duct, the inner periphery of the inner tube defines into outlet air duct, the inlet air duct is connected with the heating cavity and outside, the outlet air duct is connected with the heating cavity and the detection component.The portable explosive detector of the utility model embodiment has the advantages of compact structure, small size and easy to carry.

Description

Technical Field

[0001] This utility model relates to the field of portable explosive detectors, and in particular to a portable explosive detector. Background Technology

[0002] Portable explosive detectors primarily rely on ion mobility spectrometry (IMS) to achieve efficient detection and identification of explosive gas molecules. This technology measures the migration behavior of ions in a sample within an electric field, enabling qualitative and quantitative analysis of the substance based on the differences in migration rates of different ions under a specific electric field. Currently, in the field of explosive detection, common portable explosive detectors typically employ a heating-evaporation-gas flow method to process samples. Specifically, the detector heats the collected sample using a heating head, causing any potentially explosive components to evaporate into gaseous form. These gases are then transported to the detection module for analysis using a gas flow.

[0003] To achieve the above process, related technologies generally employ a two-pipeline structure arranged in parallel: one is an inlet pipe, used to guide external airflow into the heating head to provide carrier gas for sample heating and volatilization; the other is an outlet pipe, used to guide the airflow carrying sample gas inside the heating head to the detection component. However, this dual-pipeline arrangement has significant space-consuming issues. Because the two pipes are independent and parallel, the overall gas transmission module is relatively large, which is detrimental to the miniaturization and portability design of portable explosive detectors. Utility Model Content

[0004] This invention provides a portable explosive detector to address the shortcomings of existing explosive detectors, which are large and inconvenient to carry.

[0005] This utility model provides a portable explosive detector, comprising: Organism; A heating head assembly is disposed at one end of the machine body, and a heating cavity is formed within the heating head assembly; The detection components are housed within the machine body; The ventilation duct includes an inner duct and an outer duct. The outer duct is sleeved on the inner duct. The inner circumferential surface of the outer duct and the outer circumferential surface of the inner duct define an air inlet duct. The inner circumferential surface of the inner duct defines an air outlet duct. The air inlet duct connects the heating chamber to the outside world, and the air outlet duct connects the heating chamber to the detection component.

[0006] In some embodiments, the portable explosive detector further includes: A return air component is provided inside the heating chamber. The outer periphery of the return air component is provided with a plurality of first air inlets. The first air inlets are used to connect the air inlet duct and the heating chamber. The return air component has a return air inlet and a return air cavity, and the heating cavity, the return air inlet, the return air cavity and the air outlet duct are sequentially fluidly connected.

[0007] In some embodiments, the return air component forms a guide sidewall, which gradually slopes toward the central axis of the return air component from the direction of the first air inlet toward the return air outlet.

[0008] In some embodiments, the portable explosive detector further includes: A flow guiding assembly is disposed between the heating head assembly and the ventilation duct, and the flow guiding assembly includes: An air inlet guide is provided, which has a vent and an air guide cavity. The outer tube is fixed to the outer peripheral wall of the air inlet guide, and the air inlet duct, the vent, the air guide cavity and the heating cavity are in sequential fluid communication. The inner tube passes through the vent and is connected to the heating cavity.

[0009] In some embodiments, the flow guiding component includes: An air outlet guide is provided inside the air guide cavity. The air outlet guide has a guide port and a guide cavity. The end of the inner tube is fixed to the air outlet guide. The heating cavity, the guide cavity, the guide port and the inlet of the air outlet duct are in sequential fluid communication.

[0010] In some embodiments, the air inlet duct surrounds the outer periphery of the air outlet duct, a blower is provided at the end of the air inlet duct away from the heating chamber, and an exhaust fan is provided at the end of the detection component away from the air outlet duct.

[0011] In some embodiments, the air inlet guide includes: Multiple blades are spaced apart on the outer periphery of the vent to guide the airflow at the vent to the periphery of the vent and into the air guide cavity.

[0012] In some embodiments, the inner wall surface of the air inlet guide includes: A tapered surface, the inner diameter of which gradually increases along the direction from the ventilation duct to the heating head assembly; An annular surface, wherein the annular surface is connected to the end of the conical surface that is away from the ventilation duct; The blades are used to guide the airflow at the vent to the conical surface.

[0013] In some embodiments, the air inlet guide is provided with an annular groove corresponding to the vent, the blade is installed in the annular groove, an annular baffle is provided on the side of the blade away from the vent, and the air outlet duct passes through the vent and the annular baffle.

[0014] In some embodiments, the portable explosive detector includes: Multiple support components are snapped into the ventilation duct; The shock absorber is provided in a one-to-one correspondence with the plurality of the support members, and the shock absorber is located between the support member and the ventilation pipe.

[0015] The portable explosive detector of this utility model has an inner tube inserted inside an outer tube, thus forming a nested air duct structure. This integrates the original two independent parallel air inlet and outlet ducts into a compact concentric structure, greatly saving internal space and reducing the overall size of the portable explosive detector. This is beneficial for the miniaturization and lightweight design of the portable explosive detector, making it easier to carry.

[0016] Therefore, the portable explosive detector of this utility model has the advantages of compact structure, small size and easy portability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a half-sectional structural diagram of the portable explosive detector provided by this utility model.

[0019] Figure 2 This is a partial structural schematic diagram of the portable explosive detector provided by this utility model.

[0020] Figure 3 This is a schematic diagram of the flow guiding component of the portable explosive detector provided by this utility model.

[0021] Figure 4 This is a schematic diagram of the structure of the portable explosive detector provided by this utility model.

[0022] Figure 5 This is a schematic diagram of the installation of the support component and connecting pipe of the portable explosive detector provided by this utility model.

[0023] Figure 6 This is a schematic diagram of the air inlet guide of the portable explosive detector provided by this utility model.

[0024] Figure 7This is a half-sectional structural diagram of the air inlet guide of the portable explosive detector provided by this utility model.

[0025] Figure 8 This is a schematic diagram of the blades and annular baffle of the portable explosive detector provided by this utility model.

[0026] Figure 9 This is a schematic diagram of the air guide component of the portable explosive detector provided by this utility model.

[0027] Figure label: 100. Portable explosive detector; 1. Main body; 2. Heating head assembly; 21. Heating chamber; 3. Detection assembly; 4. Ventilation duct; 41. Air inlet duct; 42. Air outlet duct; 43. Inner duct; 44. Outer duct; 5. Airflow guiding assembly; 51. Air inlet guide; 511. Ventilation opening; 512. Air guide cavity; 513. Annular groove; 514. Conical surface; 515. Annular surface; 52. Blade; 53. Annular baffle; 6. Blower; 7. Exhaust fan; 8. Connecting pipe; 9. Support component; 10. Air outlet guide component; 11. Air outlet; 12. Air guide cavity; 13. Return air component; 130. First air inlet; 131. Return air outlet; 132. Return air chamber; 133. Return air switch; 14. Second air inlet. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] like Figures 1 to 9 As shown, the portable explosive detector 100 of this utility model embodiment includes a body 1, a heating head assembly 2, a detection assembly 3, and a ventilation duct 4.

[0030] The heating head assembly 2 is located at one end of the body 1, and a heating cavity 21 is formed inside the heating head assembly 2.

[0031] The detection component 3 is located inside the body 1.

[0032] The ventilation duct 4 includes an inner duct 43 and an outer duct 44. The outer duct 44 is fitted onto the inner duct 43. The inner circumferential surface of the outer duct 44 and the outer circumferential surface of the inner duct 43 define an air inlet duct 41. The inner circumferential surface of the inner duct 43 defines an air outlet duct 42. The air inlet duct 41 connects the heating chamber 21 to the outside world, and the air outlet duct 42 connects the heating chamber 21 to the detection component 3.

[0033] For ease of description, the left and right directions are taken as the extension directions of the machine body 1, where the left and right directions are as follows: Figure 1 As shown.

[0034] The heating head assembly 2 is located at the left end of the body 1. It has a heating chamber 21 inside for accommodating the sample. The sample is heated and burned in the heating chamber 21. The heating head assembly 2 includes an end cap and a heating element. The end cap is opened to allow the sample to be placed into the heating chamber 21. The heating element is used to ignite the substance to be tested.

[0035] After the analyte is burned in the heating chamber 21, the external airflow enters the heating chamber 21 through the air inlet duct 41 in the ventilation pipe 4, and mixes thoroughly with the analyte after combustion in the heating chamber 21 to form a high-temperature airflow carrying the molecules of the analyte. Then, the high-temperature airflow is delivered to the detection component 3 through the air outlet duct 42. The detection component 3 analyzes and identifies the composition of the molecules of the analyte carried in the airflow to detect the sample composition. Finally, the airflow is discharged from the portable explosive detector 100.

[0036] The detection principle of detection component 3 is based on ion mobility spectrometry.

[0037] The portable explosive detector 100 of this utility model has an inner tube 43 inserted inside an outer tube 44, thus forming a nested air duct structure. This integrates the original two independent parallel air inlet and outlet ducts into a compact concentric structure, greatly saving internal space and reducing the overall volume of the portable explosive detector 100. This facilitates the miniaturization and lightweight design of the portable explosive detector 100, making it easier to carry.

[0038] Therefore, the portable explosive detector 100 of this utility model has the advantages of compact structure, small size and easy portability.

[0039] In some embodiments, such as Figure 2 As shown, the portable explosive detector 100 also includes a return air component 13, which is located inside the heating chamber 21. The outer periphery of the return air component 13 is provided with a plurality of first air inlets 130, which are used to connect the air inlet duct 41 and the heating chamber 21.

[0040] The return air component 13 has a return air inlet 131 and a return air cavity 132, and the heating cavity 21, the return air inlet 131, the return air cavity 132 and the air outlet duct 42 are in sequential fluid communication.

[0041] The return air component 13 is located on the left side of the ventilation duct 4, and its outer edge has a first air inlet 130 connected to the air inlet duct 41. The return air chamber 132 is connected to the air outlet duct 42.

[0042] After the gas enters the air inlet duct 41 from the outside, it enters the heating chamber 21 through the first air inlet hole 130 and mixes with the molecules of the substance to be detected. Then it enters the return air chamber 132 through the return air inlet 131 and finally flows from the air outlet duct 42 to the detection component 3.

[0043] Multiple first air inlets 130 are circumferentially distributed around the return air component 13, ensuring that the external airflow enters the heating chamber 21 uniformly from different directions. This enhances the airflow disturbance effect and helps the molecules of the analyte to diffuse more quickly and uniformly in the heating chamber 21 and integrate into the airflow, thereby increasing the effective number of molecules delivered to the detection component 3 per unit time and improving detection sensitivity and accuracy.

[0044] In some other embodiments, a return air switch 133 is provided at the return air vent 131. The return air switch 133 is electrically connected to the controller of the portable explosive detector 100. When a preset condition is met, the controller controls the return air switch 133 to open.

[0045] For example, the controller controls the return air switch 133 according to the time. In the initial stage of the portable explosive detector 100, the return air switch 133 remains closed, allowing the sample in the heating chamber 21 sufficient time to be fully heated, thus avoiding premature introduction of airflow that may interfere with the sample heating process.

[0046] When the preset time threshold is reached, the controller will automatically open the return air switch 133 and simultaneously start the blower 6 and the exhaust fan 7. At this time, fresh outside air is forcefully pushed into the heating chamber 21 through the blower 6, fully mixed with the volatilized molecules of the test substance, and then enters the detection component 3.

[0047] In some embodiments, the return air member 13 forms a guide sidewall that gradually slopes towards the central axis of the return air member 13 from the first air inlet 130 toward the return air outlet 131. The guide sidewall is tapered, meaning its inner diameter gradually increases from left to right. The left end of the return air outlet 131 is smaller, thus concentrating the return air and guiding the airflow within the heating chamber 21 toward the return air outlet 131.

[0048] Because the airflow in the air inlet duct 41 needs to be turned back in the heating chamber 21 before entering the return air inlet 131, the airflow velocity at the return air inlet 131 is relatively high. The inner diameter of the guide sidewall gradually increases from left to right, so that after the high-temperature airflow enters the return air chamber 132, the airflow is diffused by the action of the conical guide sidewall to disperse the energy of the high-speed airflow and guide the airflow to be more evenly distributed in the entire return air chamber 132, avoiding the generation of local turbulence.

[0049] Optionally, a plurality of first air inlets 130 are arranged circumferentially around the return air element 13.

[0050] In some embodiments, such as Figure 3 As shown, the portable explosive detector 100 also includes a flow guiding assembly 5, which is located between the heating head assembly 2 and the ventilation duct 4. The flow guiding assembly 5 includes an air inlet guide 51, which forms a vent 511 and a guide cavity 512. The outer tube 44 is fixed to the outer peripheral wall of the air inlet guide 51, and the air inlet duct 41, the vent 511, the guide cavity 512 and the heating cavity 21 are in sequential fluid communication. The inner tube 43 is inserted through the vent 511 and communicates with the heating cavity 21.

[0051] The heating head assembly 2, the air guide assembly 5, and the ventilation duct 4 are arranged sequentially from left to right. After the external airflow enters the air inlet duct 41, it enters the air guide cavity 512 through the ventilation port 511, and then flows to the heating cavity 21 through the first air inlet hole 130.

[0052] The outer tube 44 is fixedly connected to the outer peripheral wall of the air inlet guide 51. For example, the outer peripheral wall of the air inlet guide 51 is provided with a stepped portion, and the air inlet guide 51 is sleeved on the stepped portion. The left end of the inner tube 43 passes through the air inlet 511 and communicates with the heating chamber 21.

[0053] In some embodiments, the airflow guiding assembly 5 includes an airflow guiding component 10, which is disposed in the airflow guiding cavity 512. The airflow guiding component 10 has a guide port 11 and a guide cavity 12. The end of the inner tube 43 is fixed to the airflow guiding component 10. The heating cavity 21, the guide cavity 12, the guide port 11 and the inlet of the airflow duct 42 are in sequential fluid communication.

[0054] The return air component 13, the outlet air guide component 10, and the inlet air guide component 51 are arranged sequentially from left to right, and the heating chamber 21, the guide chamber 12, the guide port 11, and the outlet air duct 42 are connected in sequence. The high-temperature airflow carrying the molecules of the substance to be detected first flows from the heating chamber 21 through the return air port 131 into the return air chamber 132, then enters the guide chamber 12, and then enters the outlet air duct 42 through the guide port 11, and finally flows to the detection component 3.

[0055] A second air inlet 14 is provided on the outer periphery of the air outlet guide 10. The second air inlet 14 corresponds to and is connected to the first air inlet 130. The airflow in the air guide cavity 512 passes through the second air inlet 14 and the first air inlet 130 in sequence before entering the heating cavity 21.

[0056] In some embodiments, the air inlet duct 41 surrounds the outer periphery of the air outlet duct 42, and a blower 6 is provided at the end of the air inlet duct 41 away from the heating chamber 21, and an exhaust fan 7 is provided at the end of the detection component 3 away from the air outlet duct 42.

[0057] For ease of description, Figure 1 The vertical direction is marked in the middle. Both the supply fan 6 and the exhaust fan 7 are located below the ventilation duct 4.

[0058] A blower 6 is provided at the end of the air inlet duct 41 away from the heating chamber 21, that is, a blower 6 is provided at the right end of the air inlet duct 41. The blower 6 is used to forcefully push outside air into the heating chamber 21.

[0059] The detection component 3 is located at the right end of the air outlet duct 42. The end of the detection component 3 away from the air outlet duct 42 is equipped with an exhaust fan 7. That is, the right end of the detection component 3 is equipped with an exhaust fan 7. The exhaust fan 7 can ensure that the high temperature airflow containing the molecules of the substance to be tested coming out of the heating chamber 21 can be effectively extracted and transported to the detection component 3 through the air outlet duct 42.

[0060] The portable explosive detector 100 of this utility model enhances the fluidity and speed of airflow throughout the detection process by setting up a blower 6 and an exhaust fan 7, so that the fresh external air is fully mixed with the heated and volatilized substance to be detected and delivered to the detection component 3 quickly and evenly.

[0061] In some embodiments, such as Figures 6 to 9 As shown, the air inlet guide 51 includes multiple blades 52, which are spaced apart on the outer periphery of the vent 511, and are used to guide the airflow at the vent 511 to the periphery of the vent 511 and into the air guide cavity 512.

[0062] Multiple blades 52 are arranged at an angle to form a swirling flow of air from the vent 511 to the guide cavity 512. The number of blades 52 can be set according to actual needs and is not limited here.

[0063] After the external airflow enters the air inlet duct 41, it enters the air guide cavity 512 through the vent 511, and then flows to the heating cavity 21. The function of the blades 52 is to guide the external airflow entering through the vent 511 to the surrounding area, so that it enters the air guide cavity 512 in a rotating manner, thereby forming a swirling flow.

[0064] The portable explosive detector 100 of this embodiment features blades 52 at the vent 511, which guide the external airflow to be forced into a swirling flow before entering the heating chamber 21. This significantly enhances the turbulence effect of the airflow within the heating chamber 21, allowing the analyte to be more evenly distributed in the airflow after being heated and volatilized, thus avoiding sampling deviations caused by uneven local concentrations. Furthermore, the swirling flow smooths the airflow path, reducing turbulence and making the airflow more orderly and stable during its flow.

[0065] In other embodiments, the cross-section of the first air inlet 130 (i.e., the cross-section of the first air inlet 130 obtained by cutting the plane perpendicular to the left and right directions) is waist-shaped, and the first air inlet 130 extends along the outer periphery of the return air member 13 in an arc shape, so that the swirling air can maintain its rotation characteristics without being destroyed when passing through the first air inlet 130.

[0066] In some embodiments, the inner wall surface of the air inlet guide 51 includes a conical surface 514 and an annular surface 515, the inner diameter of the conical surface 514 gradually increasing along the direction from the ventilation duct 4 to the heating head assembly 2. The annular surface 515 is connected to the end of the conical surface 514 facing away from the ventilation duct 4. The blade 52 is used to guide the airflow at the vent 511 to the conical surface 514.

[0067] An annular surface 515 is located on the left side of the conical surface 514, and the annular surface 515 is connected to the left end of the conical surface 514. The inner diameter of the conical surface 514 gradually increases from right to left. Multiple blades 52 are used to uniformly guide the external airflow entering from the vent 511 to the surface of the conical surface 514, so that the external airflow is distributed in a diffused manner along the inclined structure of the conical surface 514 and gradually transforms into a swirling flow state. The annular surface 515 further guides the swirling flow into the heating chamber 21.

[0068] The portable explosive detector 100 of this utility model, by setting a conical surface 514 and an annular surface 515 on the air inlet guide 51, guides the external airflow to gradually become a swirling flow and enter the heating chamber 21, ensuring that the gas entering the heating chamber 21 has more stable swirling characteristics, thereby enhancing the mixing efficiency and mixing uniformity of the molecules to be detected in the heating chamber 21, and improving the accuracy and stability of the subsequent detection component 3 in identifying the sample components.

[0069] In some embodiments, an annular groove 513 is provided on the air inlet guide 51 corresponding to the ventilation opening 511, the blade 52 is installed in the annular groove 513, and an annular baffle 53 is provided on the side of the blade 52 away from the ventilation pipe 4, passing through the ventilation opening 511 and the annular baffle 53.

[0070] An annular groove 513 is provided on the outer periphery of the vent 511. The right end of each blade 52 is fixedly installed in the annular groove 513, and the left side of the blade 52 is fixedly connected to the annular baffle 53. Thus, the blade 52 is fixed at the vent 511 by means of the annular groove 513 and the annular baffle 53, thereby preventing the blade 52 from shifting or loosening under the impact of high-speed airflow.

[0071] The inner tube 43 is installed between the vent 511 and the annular baffle 53, making the air inlet duct 41 and the air outlet duct 42 independent and compact.

[0072] Optionally, multiple blades 52 are integrally formed with an annular baffle 53.

[0073] In some embodiments, such as Figure 5 As shown, the portable explosive detector 100 includes multiple support members 9 and multiple shock absorbers. The multiple support members 9 are all snapped into the ventilation pipe 4. The multiple shock absorbers are arranged one-to-one with the multiple support members 9, and the shock absorbers are located between the support members 9 and the ventilation pipe 4.

[0074] Multiple support members 9 are arranged sequentially at intervals along the left and right direction. The support members 9 are located below the ventilation pipe 4. The shock absorber is located between the support member 9 and the ventilation pipe 4. The shock absorber can reduce the vibration transmitted from the support member 9 to the ventilation pipe 4, thereby reducing the impact of external vibration on the ventilation pipe 4, so that the airflow in the ventilation pipe 4 can flow smoothly and steadily, thus ensuring the accuracy of the test results.

[0075] For example, both the support member 9 and the shock absorber are provided with 3 to 6. Optionally, the shock absorber is a flexible pad, such as a silicone pad or a rubber pad.

[0076] In other embodiments, a plurality of supports 9 are arranged at intervals, and a groove is provided on one of the outer peripheral surface of the ventilation pipe 4 and the surface of the support 9, and a protrusion is provided on one of the outer peripheral surface of the ventilation pipe 4 and the surface of the support 9, with the protrusion extending into the groove.

[0077] The outer peripheral surface of the ventilation duct 4 and the surface of the support member 9 are provided with grooves, while the other is provided with corresponding protrusions. These protrusions extend into the corresponding grooves, and the shock absorbers are set in the grooves.

[0078] The portable explosive detector 100 of this utility model uses protrusions and grooves to achieve a stable connection between the ventilation pipe 4 and the support member 9. Furthermore, a shock absorber is further provided inside the groove, so that the shock absorber can be tightly embedded in the groove and form effective contact with the ventilation pipe 4 or the support member 9, thereby reducing the impact of external vibration on the ventilation pipe 4.

[0079] In other embodiments, the outlet of the detection component 3 is connected to the inlet of the exhaust fan 7 via a connecting pipe 8, which is a flexible pipe.

[0080] The connecting pipe 8 is made of flexible pipe to prevent the vibration generated by the exhaust fan 7 from being directly transmitted to the detection component 3, thus preventing such vibration from interfering with the precision measurement of the detection component 3 and affecting the accuracy of the detection results.

[0081] Furthermore, the flexible tube's bendable nature allows for flexible adjustment of the relative positions between the detection component 3 and the exhaust fan 7 according to actual installation requirements. This facilitates layout optimization and maintenance of the portable explosive detector 100. Whether to adapt to tight space constraints or to facilitate inspection and component replacement, the flexible tube provides significant convenience, making the portable explosive detector 100 not only more stable but also easier to install and debug. In addition, the flexible tube can compensate for assembly errors between the detection component 3 and the exhaust fan 7, thereby simplifying the assembly process of the portable explosive detector 100.

[0082] Optionally, the connecting tube 8 is a silicone tube or a polyurethane hose.

[0083] In other embodiments, at least a portion of the inner diameter of the connecting pipe 8 gradually increases along the direction from the detection component 3 to the exhaust fan 7.

[0084] The entire connecting pipe 8 is a tapered pipe, meaning that the inner diameter of the connecting pipe 8 gradually decreases from top to bottom. Alternatively, the upper end of the connecting pipe 8 is a tapered pipe with the inner diameter gradually decreasing from top to bottom, and the lower end of the connecting pipe 8 is an annular pipe.

[0085] The portable explosive detector 100 of this utility model has a tapered connecting pipe 8 or a portion of the connecting pipe 8 being tapered, which allows the airflow from the detection component 3 to transition smoothly during its outward flow, enabling the airflow to flow orderly towards the exhaust fan 7 and reducing turbulence and resistance loss caused by abrupt changes in cross-section. On the one hand, this improves the efficiency of the outward flow of airflow, and on the other hand, it reduces the vibration generated by the airflow during its outward flow, thus avoiding any impact on the detection component 3.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A portable explosive detector, characterized in that, include: Body (1); A heating head assembly (2) is disposed at one end of the body (1), and a heating cavity (21) is formed inside the heating head assembly (2). The detection component (3) is located inside the body (1); Ventilation pipe (4), the ventilation pipe (4) includes an inner pipe (43) and an outer pipe (44), the outer pipe (44) is sleeved on the inner pipe (43), the inner circumferential surface of the outer pipe (44) and the outer circumferential surface of the inner pipe (43) define an air inlet duct (41), the inner circumferential surface of the inner pipe (43) defines an air outlet duct (42), the air inlet duct (41) connects the heating chamber (21) and the outside, and the air outlet duct (42) connects the heating chamber (21) and the detection component (3).

2. The portable explosive detector according to claim 1, characterized in that, The portable explosive detector also includes: A return air component (13) is provided inside the heating chamber (21). The outer periphery of the return air component (13) is provided with a plurality of first air inlets (130). The first air inlets (130) are used to connect the air inlet duct (41) and the heating chamber (21). The return air component (13) has a return air inlet (131) and a return air cavity (132), and the heating cavity (21), the return air inlet (131), the return air cavity (132) and the air outlet duct (42) are in sequential fluid communication.

3. The portable explosive detector according to claim 2, characterized in that, The return air component (13) forms an air guide sidewall, which gradually tilts toward the central axis of the return air component (13) from the first air inlet (130) toward the return air outlet (131).

4. The portable explosive detector according to claim 1, characterized in that, The portable explosive detector also includes: A flow guiding assembly (5) is disposed between the heating head assembly (2) and the ventilation pipe (4), and the flow guiding assembly (5) includes: An air inlet guide (51) is formed with a vent (511) and an air guide cavity (512). The outer tube (44) is fixed to the outer peripheral wall of the air inlet guide (51). The air inlet duct (41), the vent (511), the air guide cavity (512) and the heating cavity (21) are in sequential fluid communication. The inner tube (43) is inserted through the vent (511) and communicates with the heating cavity (21).

5. The portable explosive detector according to claim 4, characterized in that, The flow guiding component (5) includes: An air outlet guide (10) is provided inside the air guide cavity (512). The air outlet guide (10) has a guide port (11) and a guide cavity (12). The end of the inner tube (43) is fixed to the air outlet guide (10). The heating cavity (21), the guide cavity (12), the guide port (11) and the inlet of the air outlet duct (42) are sequentially fluidly connected.

6. The portable explosive detector according to any one of claims 2-5, characterized in that, The air inlet duct (41) surrounds the outer periphery of the air outlet duct (42). A blower (6) is provided at one end of the air inlet duct (41) away from the heating chamber (21), and an exhaust fan (7) is provided at one end of the detection component (3) away from the air outlet duct (42).

7. The portable explosive detector according to claim 4, characterized in that, The air inlet guide (51) includes: Multiple blades (52) are spaced apart on the outer periphery of the vent (511) to guide the airflow at the vent (511) to the periphery of the vent (511) and into the air guide cavity (512).

8. The portable explosive detector according to claim 7, characterized in that, The inner wall surface of the air inlet guide (51) includes: A conical surface (514), the inner diameter of which gradually increases along the direction from the ventilation pipe (4) to the heating head assembly (2); An annular surface (515) is connected to the end of the conical surface (514) that is away from the ventilation pipe (4). The blade (52) is used to direct the airflow at the vent (511) to the conical surface (514).

9. The portable explosive detector according to claim 7, characterized in that, The air inlet guide (51) is provided with an annular groove (513) corresponding to the ventilation opening (511), the blade (52) is installed in the annular groove (513), and an annular baffle (53) is provided on the side of the blade (52) away from the ventilation pipe (4). The air outlet duct (42) passes through the ventilation opening (511) and the annular baffle (53).

10. The portable explosive detector according to any one of claims 2-5, characterized in that, The portable explosive detector includes: Multiple support members (9) are snapped into the ventilation pipe (4); The shock absorber is provided in a one-to-one correspondence with the plurality of the support members (9), and the shock absorber is provided between the support member (9) and the ventilation pipe (4).

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