CN211263191U

CN211263191U - Heating cover for trace explosive detector

Info

Publication number: CN211263191U
Application number: CN201922179093.XU
Authority: CN
Inventors: 丁志强; 袁丁; 吴红彦; 夏征
Original assignee: Beijing Htnova Detection Technology Co ltd
Current assignee: Beijing Htnova Detection Technology Co ltd
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2020-08-14
Anticipated expiration: 2029-12-09

Abstract

The utility model provides a heating lid for trace explosive detector, heating lid includes the lid, the lid is provided with the inlet port that link up, the top surface middle part of lid is provided with the guide part, the guide part is coniform sunk structure, just the top surface limit portion evenly distributed of lid has a plurality of archs. The heating cover is combined with the plurality of bulges through the guide part on the top surface, so that the sampling sheet can be effectively prevented from being sucked, and the smoothness of the gas circuit is ensured; the accuracy of temperature calibration is effectively ensured by arranging the detection plane and the detection hole on the side surface of the top; and the shading piece with the shading channel at the bottom of the air inlet hole is utilized to effectively prevent external natural light from entering the detector, so that the accuracy and reliability of the detection result are ensured.

Description

Heating cover for trace explosive detector

Technical Field

The utility model relates to a trace explosive detects technical field, especially relates to a heating lid for trace explosive detector.

Background

The detector for the fluorescent trace explosives is detection equipment integrating machinery, electronics, chemistry and optics, and has the main working principle that: after trace explosives of a detection object are obtained through the sampling sheet, the sampling sheet is inserted into a heating groove corresponding to the detector to be heated, the trace explosives are evaporated, the evaporated trace explosives are sucked into the sensitive device through the air inlet nozzle to be subjected to quenching reaction, so that the trace explosives are detected by the optical sensor, and signals are transmitted to the circuit board to be subjected to acousto-optic alarm.

The main functional part of the detector is an optical sensor part (also a sensitive device coating area and an LED lamp part), and the front-section gas inlet path of the optical sensor part determines the composition, the form and the temperature of a detected substance. Because the gas inlet circuit is coaxial with the sensitive device, the gas inlet circuit can also transmit some external natural light to enter, thereby influencing the work of the sensitive device and the spectrometer sensor and influencing the accuracy and reliability of a detection result.

The detector sampling piece under the prior art is a sheet soft board, and the end face of the air inlet is a plane, so that the sampling piece is always completely sucked in the air suction process, the air inlet is blocked, the sampling air inlet is influenced, even an air pump can be damaged, and the normal operation and the service life of the detector are seriously influenced.

In addition, since the probe needs to heat the substance to be detected to a predetermined temperature before detection, the reliability of the detection result of the temperature sensor is required to be high, and frequent calibration is required. The most commonly used contact type thermocouple for calibrating the temperature sensor can accurately measure the temperature by fully contacting the temperature sensor, and the problems of poor contact and inaccurate measurement are often caused when the temperature sensor is attached to the surface of a measured object.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to solving the above-described problems. It is an object of the present invention to provide a heating cover for a trace explosive detector that solves any of the above problems. Specifically, the utility model provides a can avoid the natural light to get into the gas circuit, avoid the sample piece to be held and the heating lid of the temperature calibration of being convenient for.

In order to solve the technical problem, the utility model provides a heating cover for trace explosive detector, heating cover includes the lid, the lid is provided with the inlet port that link up, the top surface middle part of lid is provided with the guide part, the guide part is coniform sunk structure, just the top surface limit portion evenly distributed of lid has a plurality of archs.

The heating cover further comprises a shading piece, the shading piece is embedded at the bottom of the cover body, a shading channel is arranged in the shading piece, and the shading channel is communicated with the air inlet hole.

The shading channel comprises a first channel positioned at the top of the shading piece, a second channel positioned at the bottom of the shading piece and a groove arranged in the middle of the side surface of the shading piece, and the first channel and the second channel are communicated with the groove.

The first channel is an L-shaped channel, and the second channel is an L-shaped channel.

The side face of the top of the cover body is provided with at least one detection plane, the detection plane is provided with a detection hole, and the detection hole extends along the radial direction of the cover body.

Wherein, the top side of lid is provided with two relative arrangement the detection plane.

The middle part of the heating cover is provided with a connecting part, and the top of the connecting part is provided with a sealing groove.

The heating cover provided by the utility model is combined with a plurality of bulges through the guide part on the top surface, so that the sampling sheet can be effectively prevented from being sucked, and the smoothness of the gas circuit is ensured; the accuracy of temperature calibration is effectively ensured by arranging the detection plane and the detection hole on the side surface of the top; and the shading piece with the shading channel at the bottom of the air inlet hole is utilized to effectively prevent external natural light from entering the detector, so that the accuracy and reliability of the detection result are ensured.

Other characteristic features and advantages of the invention will become apparent from the following description of exemplary embodiments, which is to be read in connection with the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention. In the drawings, like reference numerals are used to indicate like elements. The drawings in the following description are directed to some, but not all embodiments of the invention. For a person skilled in the art, other figures can be derived from these figures without inventive effort.

Fig. 1 schematically shows a structural view of a heating cover according to the present invention;

fig. 2 shows a cross-sectional view of an exemplary heating cap according to the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The basic idea of the utility model is that the structure of the heating cover is improved, and the conical concave structure is matched with the bulge of the edge part, so that the sampling sheet is effectively prevented from being sucked; through set up the detection plane in heating lid top side to set up the inspection hole on this detection plane, be favorable to the temperature calibration, guarantee the accuracy of calibration. Furthermore, the light shading piece is arranged at the outlet of the air inlet hole of the heating cover, so that the external natural light is effectively blocked from entering the air path on the premise of not blocking the air circulation, and the accuracy and the reliability of the detection result are ensured.

The following describes in detail a heating cover for a trace explosive detector according to the present invention with reference to the accompanying drawings.

Fig. 1 shows a schematic structural diagram of a heating cover for a trace explosive detector of the present invention, fig. 2 is a cross-sectional view of a specific embodiment of the heating cover, and as shown in fig. 1 and fig. 2, the heating cover includes a cover body 1, and the cover body 1 is provided with a through air inlet 11 for heating a collected sample and guiding the heated gas into a detection device in the detector. In order to avoid blocking the inlet of the air inlet 11 after the sampling sheet is adsorbed, a guide part 12 is arranged in the middle of the top surface of the cover body 1, the guide part 12 is of a conical concave structure, and a plurality of bulges 13 are uniformly distributed on the edge part of the top surface of the cover body 1. On the one hand, the plurality of projections 13 form a support for the sampling sheet; on the other hand, a certain air flow channel is formed between the adjacent protrusions 13, and the air flow channel is communicated with the air inlet 11 through the guide part 12, so that air pressure on two sides of the sampling sheet is balanced, and the sampling sheet is effectively prevented from being adsorbed on the top surface of the cover body 1.

Additionally, the utility model discloses a heating lid still includes light-shading piece 2, and light-shading piece 2 inlays in the bottom of lid 1 for inside stopping external natural light and passing through inlet port 11 entering detector, influence the testing result. Wherein, be provided with shading passageway 20 in the shading piece 2, shading passageway 20 is linked together with inlet port 11 for guarantee the smoothness nature of gas flow, effectively block external light simultaneously.

Specifically, the light shielding channel 20 includes a first channel 201 located at the top of the light shielding member 2, a second channel 202 located at the bottom of the light shielding member 2, and a groove 203 provided in the middle of the side surface of the light shielding member 2, and both the first channel 201 and the second channel 202 communicate with the groove 203. The first channel 201 is communicated with the outlet of the air inlet 11, and the groove 203 and the inner wall of the bottom of the cover body 1 form an air channel for communicating the first channel 201 and the second channel 202, so that the smoothness of air circulation is ensured.

As shown in fig. 2, in the present embodiment, the first channel 201 is an L-shaped channel, and the second channel 202 is an L-shaped channel. A blocking portion 204 is formed between the first channel 201 and the second channel 202, and the width of the blocking portion 204 is greater than the width of the entrance of the first channel 201 for effectively blocking the external natural light. Illustratively, the width of the barrier 204 is greater than or equal to 1.3 times the entrance width or diameter of the first channel 201, e.g., the width of the barrier 204 is 1.5 times the entrance width or diameter of the first channel 201. In the embodiment shown in fig. 2, the diameter of the inlet of the first channel 201 is equal to the diameter of the air inlet hole 11, the diameter of the light shielding member 2 is three times or more the diameter of the air inlet hole 11, the depth of the groove 203 is less than the diameter of the air inlet hole 11, for example, the depth of the groove 203 is equal to the radius of the air inlet hole 11, and at this time, the width of the blocking portion 204 is more than 1.5 times the diameter of the inlet of the first channel 201, which is enough to prevent the external natural light from entering the detector through the air inlet hole 11 and the light shielding channel 20.

The utility model discloses a heating cover has still carried out the improved design to the inaccurate problem of temperature calibration measurement, as shown in FIG. 1, is being provided with at least one detection plane 14 in the top side of lid 1, is provided with inspection hole 15 on detection plane 14, and inspection hole 15 is along the radial extension of lid 1 to inspection hole 15 perpendicular to monitoring plane 14 sets up. When the temperature is calibrated, the thermocouple is inserted into the detection hole 15, the detection plane 14 can ensure that the thermocouple is in full and stable contact, the measured temperature value is accurate, and the calibration precision is ensured.

In the present embodiment, the top side of the cover 1 is provided with two oppositely arranged detection planes 14, and each detection plane 14 is vertically provided with a detection hole 15 extending along the radial direction of the cover 1. It should be noted that the detection hole 15 is a blind hole and does not communicate with the guide portion 12 or the air intake hole 11.

The middle part of this heating lid is provided with connecting portion 16 for be connected with trace explosive detector, detect the discernment through leading-in detector inside through inlet port 11 after guaranteeing to heat the material abundant on the sampling piece. Illustratively, the connection 16 may be a thread adapted to the probe housing.

In order to ensure the air tightness between the heating cover and the detector, a sealing groove 17 is provided at the top of the connecting portion 16, and a sealing ring such as an O-ring may be provided in the sealing groove 17 to seal a gap between the heating cover and the detector.

The above-described embodiments can be implemented individually or in various combinations, and such variations are within the scope of the present invention.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of additional like elements in the article or device comprising the element.

The above embodiments are merely for illustrating the technical solutions of the present invention and are not to be construed as limiting, and the present invention is described in detail with reference to the preferred embodiments. It should be understood by those skilled in the art that various modifications and equivalent substitutions may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all the modifications and equivalents should be covered by the scope of the claims of the present invention.

Claims

1. The heating cover for the trace explosive detector is characterized by comprising a cover body (1), wherein the cover body (1) is provided with a through air inlet hole (11), a guide part (12) is arranged in the middle of the top surface of the cover body (1), the guide part (12) is of a conical recessed structure, and a plurality of protrusions (13) are uniformly distributed on the edge part of the top surface of the cover body (1).

2. The heating cover according to claim 1, further comprising a light shielding member (2), wherein the light shielding member (2) is embedded in the bottom of the cover body (1), and a light shielding channel (20) is disposed in the light shielding member (2), and the light shielding channel (20) is communicated with the air inlet hole (11).

3. The heating cover according to claim 2, wherein the light shielding channel (20) comprises a first channel (201) located at the top of the light shielding member (2), a second channel (202) located at the bottom of the light shielding member (2), and a groove (203) provided at the middle of the side of the light shielding member (2), the first channel (201) and the second channel (202) both communicating with the groove (203).

4. A heating cover according to claim 3, wherein said first channel (201) is an L-shaped channel and said second channel (202) is an L-shaped channel.

5. The heating cover according to claim 1, characterized in that the cover body (1) is provided with at least one detection plane (14) on the top side, and a detection hole (15) is provided on the detection plane (14), the detection hole (15) extending in the radial direction of the cover body (1).

6. The heating lid as claimed in claim 5, characterized in that the top side of the lid body (1) is provided with two oppositely arranged detection planes (14).

7. The heating cap as claimed in claim 1, wherein a connecting portion (16) is provided at a middle portion of the heating cap, and a sealing groove (17) is provided at a top portion of the connecting portion (16).