A device for extracting combustion-supporting agents from combustion residues

Abstract

This utility model belongs to the field of evidence extraction technology and discloses a device for extracting combustion accelerants from combustion residues. It includes a base plate, on which a water bath heating chamber, a vacuum suction device, and a controller are mounted. A sealed chamber is installed inside the water bath heating chamber. A one-way air inlet valve is located at the end of an air inlet pipe on one side of the sealed chamber, and a one-way exhaust valve on the other side of the sealed chamber is connected to the vacuum suction device via a flexible hose. An activated carbon filter is installed in a filter assembly located in the middle of the flexible hose. Water bath heating ensures more uniform heating of the sealed chamber, which is beneficial for the decomposition of combustion accelerants in the combustion residues. The vacuum suction device reduces the air pressure inside the sealed chamber, lowers the volatilization and decomposition temperature of the combustion accelerant, and increases the extraction rate of the device. Under the action of the vacuum suction device, substances volatilized from the residues are discharged from the sealed chamber and adsorbed by the activated carbon filter, thereby collecting more combustion accelerant substances and making the extraction effect of the device more ideal.

Description

Technical Field

[0001] This utility model relates to the field of physical evidence extraction technology, and in particular to a device for extracting combustion-supporting agents from combustion residues. Background Technology

[0002] After a fire occurs, relevant departments usually need to take samples of the burning residue at the fire scene in order to determine the nature of the fire and see if it was arson. Since arson usually uses common accelerants such as alcohol, gasoline, and diesel, the testing department will extract the accelerants from the burning residue samples.

[0003] Currently, the extraction methods for residual combustion accelerants typically employ solvent extraction and activated carbon adsorption. While solvent extraction offers high sensitivity, the process is cumbersome, requires a large amount of solvent, and can easily cause environmental pollution. Traditional activated carbon adsorption involves simply mixing the residue sample with a solvent and then applying activated carbon for adsorption. This method results in a slow extraction rate, a small amount of combustion accelerant extracted, and unsatisfactory extraction results, making subsequent testing inconvenient. Utility Model Content

[0004] The present invention aims to provide a device for extracting combustion-supporting agents from combustion residues, so as to solve the problem of poor extraction effect of combustion-supporting agents from combustion residues at present.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] The basic technical solution provided by this utility model is: a combustion aid extraction device for combustion residues, comprising a base plate, on which a water bath heating box, a vacuum suction device, and a controller are respectively arranged. The controller, the vacuum suction device, and the water bath heating box are electrically connected. A sealed box is arranged inside the water bath heating box. The sealed box is suspended inside the water bath heating box by a fixing component. A sealing cover is provided at the top of the sealed box. A perforated partition is provided inside the sealed box. An air inlet pipe is provided on one side of the sealed box. A one-way air inlet valve is provided at the end of the air inlet pipe. A one-way exhaust valve is provided on the other side of the sealed box. The one-way exhaust valve is connected to the vacuum suction device through a hose. A filter component is provided in the middle section of the hose. Activated carbon filter cotton is provided inside the filter component.

[0007] The basic technical solution operates as follows: The controller is electrically connected to the water bath heating chamber and the vacuum suction device via wires, and both can be precisely controlled by the controller. The controller adjusts the temperature of the water bath heating chamber to heat the sealed chamber, and simultaneously controls the vacuum suction device to extract air from the sealed chamber, reducing the air pressure. This allows the combustion-supporting components in the combustion residue sample to more easily volatilize or decompose. After a period of reaction, the one-way inlet and one-way outlet valves are opened, allowing outside air to enter the sealed chamber through the one-way inlet valve. This air carries the decomposed combustion-supporting components out of the sealed chamber through the one-way outlet valve and into the filter assembly via a hose. The activated carbon filter in the filter assembly adsorbs the various decomposed substances, thus extracting the combustion-supporting components from the combustion residue.

[0008] The beneficial effects of the basic technical solution are as follows: The temperature of the water bath heating chamber is controlled by a controller, allowing for better temperature control and more uniform heating of the sealed chamber, which is beneficial for the decomposition of combustion-supporting agents in the combustion residue. The vacuum suction device reduces the air pressure inside the sealed chamber, thereby lowering the volatilization and decomposition temperature of common combustion-supporting agents such as alcohol and gasoline, thus reducing reaction time and increasing the extraction rate of the device. After the reaction is complete, opening the one-way inlet and one-way outlet valves allows most of the substances volatilized from the combustion residue to be discharged from the sealed chamber under the action of the vacuum suction device. These substances flow through a hose into the filter assembly, where activated carbon filter cotton adsorbs the various decomposed substances, collecting more combustion-supporting agents for subsequent testing, resulting in a more ideal extraction effect.

[0009] Preferably, the filter assembly consists of a filter and an arc-shaped cover. One side of the arc-shaped cover is hinged to the filter. Two sets of locking rods are arranged opposite each other in the cavity inside the arc-shaped cover. A compression spring is arranged between the two sets of locking rods. The ends of the locking rods pass through the arc-shaped cover and are locked in the locking holes, which are opened on the filter.

[0010] The above-described design allows the arc-shaped cover to flip over on the filter, making it easy for the operator to open the filter and insert or remove the activated carbon filter cotton. After operation, the arc-shaped cover is closed, and under the action of the compression spring, the locking rod extends out of the arc-shaped cover and engages with the locking hole on the filter, thereby locking the arc-shaped cover and sealing the filter. No additional locking operation is required from the operator. To open the arc-shaped cover, simply move the two locking rods in opposite directions to disengage them from the locking hole. The operation is simple and convenient.

[0011] Preferably, two sets of elastic sheets are arranged opposite each other in the cavity of the filter, with the elastic sheets located directly below the activated carbon filter cotton.

[0012] With the above settings, when the arc-shaped cover is closed, the activated carbon filter cotton is always pressed against the elastic sheet, causing it to undergo elastic deformation. After extraction is complete, when the arc-shaped cover is opened, the elastic sheet rebounds, slightly lifting the activated carbon filter cotton, making it easy for the operator to remove it from the filter.

[0013] Preferably, the fixing assembly consists of a fixing frame and a crossbar. Two opposing sets of fixing frames are connected by the crossbar. The bottom end of the fixing frame passes through a fixing hole, which is located on both sides of the water bath heating box.

[0014] The above settings allow the sealing box to be suspended in the water bath heating box, preventing its bottom from contacting the water bath heating box. This results in more even heating of the sealing box. After use, the operator can simply hold the crossbar and lift it upwards to disengage the fixing bracket from the fixing hole, making it easy to remove the sealing box for cleaning.

[0015] Preferably, a fixing block is provided inside the sealed box, the fixing block is in contact with the bottom surface of the perforated partition, and a magnetic strip is provided between the fixing block and the perforated partition.

[0016] With the above setup, the perforated partition can be securely placed inside the sealed box by the magnetic attraction of the magnetic strip, preventing it from shaking, and can be easily removed from the sealed box to clean up the combustion residue.

[0017] Preferably, a storage box is provided on the base plate, and a sliding storage drawer is provided inside the storage box.

[0018] With the above setup, the storage drawer can be used to store unused activated carbon filter cotton. When using the device, simply open the storage drawer to take out the activated carbon filter cotton and install it into the filter. There is no need for the operator to use a separate container to store or carry the activated carbon filter cotton, which reduces the operator's burden. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a combustion aid extraction device for combustion residues according to the present invention;

[0020] Figure 2 This is a schematic diagram of the assembly structure of a combustion aid extraction device for combustion residues according to the present invention;

[0021] Figure 3 This is a cross-sectional view of the sealed box in a combustion aid extraction device for combustion residues according to the present invention;

[0022] Figure 4 This is a cross-sectional view of a filter assembly in a combustion aid extraction device for combustion residues according to the present invention.

[0023] The corresponding labels in the attached diagram are as follows: 1. Base plate; 2. Water bath heating box; 3. Sealed box; 4. Sealed cover; 5. Hoses; 6. Filter; 7. Vacuum suction device; 8. Controller; 9. Perforated partition; 10. Magnetic strip; 11. One-way air inlet valve; 12. Air inlet pipe; 13. Storage drawer; 14. Storage box; 15. Lock hole; 16. Elastic sheet; 17. Activated carbon filter cotton; 18. Compression spring; 19. Locking rod; 20. Arc-shaped cover; 21. Fixing frame; 22. Crossbar; 23. One-way exhaust valve; 24. Fixing hole; 25. Fixing block. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments:

[0025] like Figures 1-4 As shown: A combustion aid extraction device for combustion residues includes a base plate 1, on which a water bath heating chamber 2, a vacuum suction device 7, and a controller 8 are respectively installed. The controller 8 is electrically connected to the vacuum suction device 7 and the water bath heating chamber 2. A sealed box 3 is installed inside the water bath heating chamber 2. The sealed box 3 is suspended inside the water bath heating chamber 2 by a fixing component. A sealing cover 4 is installed at the top of the sealed box 3. A perforated partition 9 is installed inside the sealed box 3. An air inlet pipe 12 is installed on one side of the sealed box 3. A one-way air inlet valve 11 is installed at the end of the air inlet pipe 12. A one-way exhaust valve 23 is installed on the other side of the sealed box 3. The one-way exhaust valve 23 is connected to the vacuum suction device 7 through a hose 5. A filter component is installed in the middle section of the hose 5. Activated carbon filter cotton 17 is installed inside the filter component.

[0026] The specific implementation process is as follows:

[0027] First, the residual combustion sample is mixed with the solvent and placed in the sealed box 3. Then, the sealed cover 4 is closed, the one-way air inlet valve 11 is closed, and the temperature is set by the controller 8 to control the water bath heating box 2 to heat the sealed box 3, so that the combustion aids and other substances in the residual combustion sample will volatilize and decompose.

[0028] Secondly, the vacuum suction device 7 is controlled by the controller 8 to extract air from the sealed box 3 through the one-way exhaust valve 23, thereby reducing the internal air pressure, which allows the combustion accelerant in the residual combustible sample to evaporate more quickly, shortens the reaction time, and improves the efficiency of the device.

[0029] Finally, after the reaction is complete, open the one-way air inlet valve 11 to allow outside air to enter the sealed chamber 3 through the one-way air inlet valve 11. Then, in conjunction with the vacuum suction device 7, allow the combustion-supporting agents and other substances decomposed in the sealed chamber 3 to be discharged outside the sealed chamber 3 through the one-way exhaust valve 23. The substances then flow through the hose 5 to the activated carbon filter cotton 17, where the extracted substances are adsorbed. After the adsorption is complete, open the filter assembly, remove the activated carbon filter cotton 17, and the extract can be obtained for subsequent testing.

[0030] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A combustion-supporting agent extraction device for combustion residues, characterized by: The device includes a base plate (1), on which a water bath heating box (2), a vacuum suction device (7), and a controller (8) are respectively installed. The controller (8) is electrically connected to the vacuum suction device (7) and the water bath heating box (2). A sealed box (3) is installed inside the water bath heating box (2). The sealed box (3) is suspended inside the water bath heating box (2) by a fixing component. A sealing cover (4) is installed at the top of the sealed box (3). A perforated partition (9) is installed inside the sealed box (3). An air inlet pipe (12) is installed on one side of the sealed box (3). A one-way air inlet valve (11) is installed at the end of the air inlet pipe (12). A one-way exhaust valve (23) is installed on the other side of the sealed box (3). The one-way exhaust valve (23) is connected to the vacuum suction device (7) through a hose (5). A filter component is installed in the middle section of the hose (5). Activated carbon filter cotton (17) is installed inside the filter component.

2. A combustion-supporting agent extraction device for combustion residues according to claim 1, characterized in that: The filter assembly consists of a filter (6) and an arc-shaped cover (20). One side of the arc-shaped cover (20) is hinged to the filter (6). Two sets of locking rods (19) are arranged opposite each other in the cavity inside the arc-shaped cover (20). A compression spring (18) is arranged between the two sets of locking rods (19). The end of the locking rod (19) passes through the arc-shaped cover (20) and is locked in the locking hole (15). The locking hole (15) is opened on the filter (6).

3. A combustion-supporting agent extraction device for combustion residues according to claim 2, characterized in that: Two sets of elastic sheets (16) are arranged opposite each other in the cavity of the filter (6), and the elastic sheets (16) are located directly below the activated carbon filter cotton (17).

4. The combustion-supporting agent extraction device for combustion residues according to claim 1, characterized in that: The fixing assembly consists of a fixing frame (21) and a crossbar (22). Two sets of fixing frames (21) are connected by the crossbar (22). The bottom end of the fixing frame (21) passes through the fixing hole (24), which is opened on both sides of the water bath heating box (2).

5. The combustion-supporting agent extraction device for combustion residues according to claim 1, characterized in that: A fixing block (25) is provided inside the sealed box (3). The fixing block (25) is in contact with the bottom surface of the perforated partition (9). A magnetic strip (10) is provided between the fixing block (25) and the perforated partition (9).

6. The combustion-supporting agent extraction device for combustion residues according to claim 1, characterized in that: A storage box (14) is provided on the base plate (1), and a sliding storage drawer (13) is provided inside the storage box (14).

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