A powder dispersion test chamber

Abstract

This invention provides a powder dispersion test chamber. Through structural improvements, the powder material within the chamber can be effectively dispersed, resulting in a more uniform spatial distribution of powder particle concentration and improved accuracy of the dispersion test. Furthermore, it effectively cleans the powder material inside the chamber after the test. The powder dispersion test chamber includes: a chamber with an optical testing window; a feeding and dispersion unit, a purging and cleaning unit, and an exhaust and dust removal unit mounted on the chamber; and a sensor unit and an illumination unit located inside the chamber. The feeding and dispersion unit feeds and disperses the powder material into the chamber; the purging and cleaning unit cleans the residual powder material on the inner walls of the chamber after the test; the exhaust and dust removal unit removes residual powder material from the chamber after the test; the sensor unit monitors the temperature and humidity inside the chamber and the concentration of powder particles in real time; and the illumination unit adjusts the brightness inside the chamber.

Description

Technical Field

[0001] This utility model relates to a test chamber, specifically a powder dispersion test chamber, and belongs to the field of powder dispersion test technology. Background Technology

[0002] Powder test chambers are mainly used to disperse powder materials (such as powder smoke materials) to form aerosols or similar dispersion systems, supporting the conduct of related tests such as concentration and photoelectric effect.

[0003] The existing powder dispersion test chamber has a fan installed at the bottom of the chamber for powder dispersion. During the test, the powder material is first sprinkled on the bottom surface of the chamber or sprayed in through small holes on the side of the chamber. Then, the airflow provided by the fan disperses the powder material in the chamber space, and relevant test data are measured. After the powder dispersion test, the powder material is directly extracted using an exhaust fan.

[0004] However, in actual experiments, after the fan was turned on, most of the powder material still deposited on the bottom surface of the chamber or accumulated in localized areas such as the corners of the chamber, failing to suspend well within the chamber space. This resulted in a low effective dispersion rate of the powder material and uneven concentration distribution of the powder material in different spatial locations within the chamber, affecting the accuracy of the test data. Furthermore, directly extracting the powder material using an exhaust fan could not effectively clean the powder material after the experiment. Utility Model Content

[0005] In view of this, the present invention provides a powder dispersion test chamber. By improving the structure of the test chamber, the powder material inside the test chamber can be effectively dispersed, thereby making the spatial distribution of powder particle concentration inside the test chamber more uniform and improving the accuracy of the dispersion test; and it can also effectively clean the powder material inside the chamber after the test.

[0006] The technical solution of this utility model is: a powder dispersion test chamber, comprising: a chamber with an optical test window, a feeding and dispersion unit, a blowing and cleaning unit, an exhaust and dust removal unit, and a sensor unit and a lighting unit disposed inside the chamber.

[0007] The feeding and dispersing unit is used to convey and disperse the powder material into the box at the same time.

[0008] The purging and cleaning unit is used to purge and clean the residual powder material on the inner wall of the chamber after the test;

[0009] The exhaust and dust removal unit is used to remove residual powder materials from the chamber after the test;

[0010] The sensor unit is used to monitor the temperature and humidity inside the box and the concentration of powder particles inside the box in real time.

[0011] The lighting unit is used to adjust the brightness inside the enclosure.

[0012] As a preferred embodiment of this utility model, the box body includes a lower support frame, a middle box body, and an upper top cover.

[0013] As a preferred embodiment of the present invention, the feeding and dispersing unit includes: a hopper, a conveying unit, and a fan;

[0014] The hopper is used to hold powder materials;

[0015] The lower end of the hopper is connected to the feeding pipe, and the feeding pipe is connected to the internal space of the box.

[0016] The conveying unit is used to convey the powder material in the feeding pipe to the box;

[0017] The box is equipped with several fans for stirring and dispersing the powder materials conveyed into the box.

[0018] As a preferred embodiment of this utility model, it further includes a blower, the air outlet of which is connected to the feeding pipe through an air blowing pipe, for blowing the powder material in the feeding pipe into the housing.

[0019] As a preferred embodiment of the present invention, the blowing and cleaning unit includes: an air distribution duct and an airflow nozzle;

[0020] Several air distribution ducts are installed inside the housing, and the air distribution ducts are connected to the air compressor through external air inlet ducts;

[0021] The air distribution duct is equipped with several airflow nozzles connected to it for blowing out positive pressure airflow.

[0022] As a preferred embodiment of this utility model, the air distribution duct is capable of rotating around its own axis.

[0023] As a preferred embodiment of the present invention: the purging and cleaning unit further includes a window cleaning branch for cleaning the optical test window and protecting the airflow;

[0024] The window cleaning branch is led out from the air distribution duct and includes: a branch pipe connected to the air distribution duct and an annular pipe connected to the branch pipe; a number of airflow nozzles are arranged circumferentially on the annular pipe, and the airflow nozzles are connected to the annular pipe, thereby forming a surrounding airflow branch.

[0025] The diameter of the annular tube is larger than the diameter of the optical test window.

[0026] As a preferred embodiment of this utility model: the exhaust and dust removal unit is located at the exhaust port of the housing, and includes an exhaust pipe connected to the exhaust port and an exhaust fan connected to the exhaust pipe.

[0027] As a preferred embodiment of this utility model: the box body is further provided with a heating rod and / or a spray unit;

[0028] The heating rod is used to regulate the temperature inside the chamber;

[0029] The spray unit is used to spray water mist into the box to regulate the humidity inside the box.

[0030] As a preferred embodiment of this utility model, it also includes an integrated control console, which is arranged outside the housing and is used to realize integrated control of the feeding and dispersing unit, the blowing and cleaning unit, the exhaust and dust removal unit and the lighting unit, as well as real-time display of the measurement data of the sensor unit.

[0031] Beneficial effects:

[0032] (1) The powder dispersion test chamber of this utility model is equipped with a feeding and dispersion unit that can transport and disperse powder materials. It can disperse powder materials while transporting them into the chamber, so that the powder materials entering the test chamber are effectively dispersed. At the same time, a blowing and cleaning unit is provided for blowing away the residual powder materials on the inner wall of the chamber after the test. This can effectively prevent the powder materials from adsorbing on the inner wall of the chamber after the test. The blowing and cleaning unit, together with the exhaust and dust removal unit, can effectively clean the residual powder materials in the chamber after the test.

[0033] (2) In the powder dispersion test chamber of this utility model, the feeding and dispersion unit adopts a combination of conveying unit, fan and blower, which can continuously convey and disperse powder materials into the chamber, avoid the powder materials from accumulating on the bottom surface of the chamber, and make the powder materials inside the test chamber more evenly distributed.

[0034] (3) In the powder dispersion test chamber of this utility model, the purging and cleaning unit uses an airflow nozzle to blow out positive pressure airflow to purify the inner wall of the chamber, which has a simple structure and high cleaning efficiency.

[0035] (4) The powder dispersion test chamber of this utility model is further provided with a window cleaning branch, which can not only protect the airflow of the optical test window during the test to avoid the powder material adsorbing on the optical test window and affecting the test accuracy; it can also be used to clean the optical test window after the test.

[0036] (5) In the powder dispersion test chamber of this utility model, the temperature and humidity inside the chamber can be controlled by setting heating rods and spraying units to meet different test requirements.

[0037] (6) In the powder dispersion test chamber of this utility model, by setting an integrated control console, the integrated control of the test process and the real-time display of the test data can be realized. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the overall structure of the powder dispersion test chamber of this utility model. Figure 1 ;

[0039] Figure 2 This is a schematic diagram of the overall structure of the powder dispersion test chamber of this utility model. Figure 2 ;

[0040] Figure 3 This is a schematic diagram of the internal structure of the powder dispersion test chamber of this utility model. Figure 1 ;

[0041] Figure 4 This is a schematic diagram of the internal structure of the powder dispersion test chamber of this utility model. Figure 2 ;

[0042] Figure 5 This is a schematic diagram of the arrangement of the purging and cleaning unit inside the powder dispersion test chamber of this utility model.

[0043] Figure 6 A schematic diagram of the fan arrangement inside the enclosure;

[0044] Figure 7 This is a schematic diagram of the top cover of the test chamber;

[0045] Figure 8 This is a structural diagram of the support frame and the main body of the box;

[0046] Among them: 1-box body, 11-support frame, 111-frame, 112-sealing plate, 113-moving wheels, 12-box body, 121-door, 122-optical test window, 123-bottom plate, 13-top cover, 14-lighting lamp, 15-heating rod, 16-spray unit, 17-temperature and humidity sensor;

[0047] 2-Feeding and dispersing unit, 21-Hopper, 22-Feeding pipe, 23-Conveying unit, 24-Blower, 25-Screw, 26-Blowing pipe, 27-Pressure balancing pipe, 28-Fan;

[0048] 3-Purge cleaning unit, 31-Air distribution duct, 32-Airflow nozzle, 33-Motor, 34-Drive shaft, 35-Drive reversing unit;

[0049] 4-Exhaust and dust removal unit, 41-Exhaust outlet, 42-Exhaust duct. Detailed Implementation

[0050] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0051] This embodiment provides a powder dispersion test chamber that can effectively disperse powder materials in the test chamber, thereby making the spatial distribution of powder particle concentration in the test chamber more uniform, and can effectively clean the powder materials in the chamber after the test.

[0052] As an example, the powder material is a smoke screen powder material.

[0053] like Figure 1 and Figure 2 As shown, the powder dispersion test chamber includes: a chamber body 1, a feeding and dispersion unit 2 installed on the chamber body 1, a blowing and cleaning unit 3, an exhaust and dust removal unit 4, and a sensor unit and a lighting unit installed inside the chamber body 1.

[0054] The box 1 is divided into three parts from bottom to top: the lower support frame 11, the middle box body 12, and the upper top cover 13.

[0055] The support frame 11 is used to support the main body 12 of the box, and the top cover 13 is used to close the top opening of the main body 12 of the box and to install the lighting unit.

[0056] As an example, the support frame 11, the main body 12, and the top cover 13 all adopt an aluminum alloy frame and stainless steel plate structure, which facilitates disassembly, replacement, and maintenance. As an example, such as... Figure 8 As shown, the support frame 11 has a cubic structure, including an aluminum alloy profile support frame 111 and several sealing plates 112 surrounding the four sides of the support frame 111; the sealing plates 112 are made of stainless steel (the sealing plates are installed in conjunction with the aluminum alloy profile slots). The bottom of the support frame 111 is equipped with four casters 113 for easy movement of the test chamber.

[0057] The interior of the main chamber 12 serves as the test space for powder dispersion testing. The main chamber 12 is a cubic structure with openings at the top and bottom and closed on all four sides. The overall frame is constructed of aluminum alloy profiles, and the four-sided sealing plates are made of stainless steel plates covered with acrylic sheets (the sealing plates are installed using slots in the aluminum alloy profiles). Openings are located on the sealing plates on the left and right sides of the main chamber 12 for mounting optical test windows 122. Two optical test windows 122 are coaxially arranged on the left and right sides, forming a group. In this example, three groups of optical test windows 122 are provided. The materials of the test windows 122 can be visible light-transmitting, infrared-transmitting, dual-band laser-transmitting, and millimeter-wave optical materials, etc. To facilitate the replacement of the optical test windows 122, connecting flanges are provided at the openings on the main chamber 12 for mounting the optical test windows 122. The optical test windows 122 are connected to these connecting flanges via flanges, thereby enabling the optical test windows 122 to be detachable and replaceable.

[0058] A door 121 is installed on the sealing plate at the front end of the main body 12 of the enclosure for personnel to enter and exit and for maintenance.

[0059] like Figures 3-5 As shown, several feeding and dispersing units 2 are installed on the chamber 1 to convey and disperse powder materials into the chamber body 12. As an example, one feeding and dispersing unit 2 is provided on each of the left and right sides of the front panel of the chamber 1. By dispersing the powder materials through the feeding and dispersing units 2, the powder materials inside the test chamber can be more evenly distributed.

[0060] like Figure 3 As shown, the feeding and dispersing unit 2 includes: a hopper 21, a conveying unit 23, a blower 24, and a fan 28; wherein the hopper 21 is used to hold powder materials; the lower end of the hopper 21 is connected to the feeding pipe 22, and the feeding pipe 22 is connected to the internal space of the box body 12 to realize feeding materials into the box body 12.

[0061] As an example, the feeding pipe 22 feeds material into the body of the box body 12 through the feeding port provided on the bottom plate 123 of the box body 12 (the feeding pipe 22 is connected to the feeding port provided on the bottom plate 123 of the box body 12).

[0062] As an example, the hopper 21 adopts a barrel-shaped structure with a cylindrical upper part and a conical bottom, and the small end of the bottom cone is connected to the feeding pipe 2.

[0063] As an example, the top opening of the hopper 21 is provided with an openable and closable cover that is sealed by a sealing ring.

[0064] In the feeding and dispersing unit 2, the powder material in the hopper 21 enters the main body 12 of the box body from the feeding pipe 22 under the action of the conveying unit 23 and the blower 24; wherein the conveying unit 23 is used to convey the powder material entering the feeding pipe 22 forward (i.e. towards the main body 12 of the box body); the blower 24 is used to blow the powder material conveyed by the conveying unit 23 into the main body 12 of the box body. That is, the feeding and dispersing unit 2 uses the conveying unit 23 to convey and the blower 24 to blow the powder material into the main body 12 of the box body.

[0065] As an example, the conveying unit 23 adopts a screw conveying method. The mechanical thrust generated by the rotation of the screw 25 continuously conveys the powder material from the hopper 21 to the feed port. The blower 24 blows the powder material conveyed by the screw 25 into the main body of the box 12 by generating positive pressure and assists in dispersing the powder material.

[0066] Based on this, the conveying unit 23 includes a screw 25 and a drive motor, the drive motor being used to drive the screw 25 to rotate; one end of the screw 25 is connected to the drive motor, and the other end extends into the feed pipe 22. The portion of the screw 25 located inside the feed pipe 22 is equipped with helical blades, thereby conveying the powder material that enters the feed pipe 22 from the lower end of the hopper 21 forward when the screw 25 rotates. This conveying method enables continuous conveying of powder materials.

[0067] As an example, the conveying unit 23 adjusts the speed via a frequency converter to achieve the function of adjusting the feed flow rate.

[0068] The air outlet of the blower 24 is connected to the feeding pipe 22 through the air blowing pipe 26, and the connection position is located at the front end of the screw 25, that is, the side where the feeding pipe 22 connects to the main body of the box 12. The blower 24 blows the powder material conveyed by the screw 25 into the main body of the box 12.

[0069] As an example, the air inlet of the blower 24 is connected to the housing body 12, using the gas in the housing body 12 (preventing external air from entering the housing body 12), and flowing back into the housing body 12.

[0070] As an example, the upper part of the hopper 21 is connected to the main body of the box 12 through the pressure balancing pipe 27, which promotes the pressure balance in the hopper 21 and the main body of the box 12, thereby utilizing the output of powder materials.

[0071] Several fans 28 are distributed on the bottom plate 123 of the main body 12 of the chamber. These fans 28 agitate and disperse the powder material fed into the main body 12 through the feed inlet, ensuring it is fully and evenly dispersed in a suspended state within the main body 12 for subsequent testing. In this example, as... Figure 5As shown, a total of eight fans 28 are arranged on the bottom plate 123 of the main body 12 of the enclosure, with four fans in each of two rows. The fans 28 are frequency converters, and the wind speed is adjustable from 0 to 3000 r / min. Each fan 28 can be controlled independently, and any fan 28 can be turned on as needed.

[0072] The purging and cleaning unit is arranged on the main body 12 of the chamber and is used to purge and clean the residual powder material on the inner wall of the main body 12 after each test. Figures 2-4 As shown, the purging and cleaning unit includes: a distribution duct 31 and airflow nozzles 32 (such as air caps); the distribution duct 31 is supported on the inner wall of the housing body 12, and one end of the distribution duct 31 extends out of the housing body 12 and is connected to the air compressor via a flexible hose (the air passage is sealed at the point where the distribution duct 31 extends out of the housing body 12). Several airflow nozzles 32 are installed on each distribution duct 31, and the airflow nozzles 32 communicate with the distribution duct 31, with the air outlets of the airflow nozzles 33 facing the inner wall of the housing body 12. At least one distribution duct 31 is provided on each inner wall surface of the housing body 12.

[0073] Therefore, an external air compressor supplies compressed air to the air distribution duct 31, and the compressed air in the air distribution duct 31 is blown out by the airflow nozzle 32, forming a positive pressure airflow toward the inner wall of the chamber body 12, which blows away the residual powder adsorbed on the inner wall of the chamber body 12. This blowing and cleaning unit can blow away the residual powder adsorbed on the inner wall of the chamber body 12, realizing rapid and efficient cleaning of flue gas and powder particles inside the chamber body 12 after the test.

[0074] As an example, such as Figure 7 As shown, several air distribution pipes 31 are also arranged on the top cover 13. The air distribution pipes 31 are supported on the top cover 13. Each air distribution pipe 31 is also equipped with several airflow nozzles 32, which can be used for blowing the inner surface of the top cover 13.

[0075] As an example, both ends of the air distribution duct 31 are rotatably supported (e.g., by bearings) on the main body 12 of the housing. The air distribution duct 31 can rotate 360° around its own axis to achieve efficient cleaning of the inner wall of the main body 12. Specifically: one end of the air distribution duct 31 extends out of the main body 12 and is connected to a flexible hose by a dynamic seal, while the other end extends out of the main body 12 and is connected to a power unit. The power unit drives the air distribution duct 31 to rotate 360° around its own axis.

[0076] As an example, a power unit, such as a rotary motor, can be provided for each air distribution duct 31.

[0077] As another example, such as Figure 5As shown, two air distribution ducts 31 located in the same horizontal plane and in the same direction are grouped together and driven by a power unit to rotate around their own axis. The power unit includes a motor 33, a transmission shaft 34, and two transmission reversing units 35. The motor 33 is located at one end of the transmission shaft 34 and is used to drive the transmission shaft 34 to rotate around its own axis. A transmission reversing unit 35 (such as a gear transmission reversing mechanism) is set on the transmission shaft 34 at a position corresponding to the two air distribution ducts 31 in the corresponding group to realize the reversal of the transmission so as to drive the corresponding air distribution duct 31 to rotate around its own axis.

[0078] To achieve cleaning of the optical test window 122 on the side panel of the main body 12 of the enclosure and to protect the airflow, preventing powder from adhering to the optical test window 122, the purging and cleaning unit is further equipped with a window cleaning branch (not shown in the figure) for cleaning the optical test window 122. Each optical test window 122 is equipped with a window cleaning branch to clean the optical glass of the optical test window 122.

[0079] As an example, the window cleaning branch is led out from the air distribution duct 31 corresponding to the sealing plate where the optical test window 122 is located, including: a branch pipe connected to the air distribution duct 31, and an annular pipe connected to the branch; a number of airflow nozzles are arranged circumferentially on the annular pipe, and the airflow nozzles are connected to the annular pipe, thereby forming a surrounding airflow branch. The diameter of the annular pipe is larger than the diameter of the optical test window 122, so it does not affect the optical path of the optical test window 122.

[0080] During the test, the surrounding airflow branch can be activated to protect the optical test window 122 from airflow and prevent powder material from adsorbing on the optical test window 122 during the test, which would affect the accuracy of the test. After the test, the surrounding airflow branch can be activated to clean the optical test window 122.

[0081] It is worth noting that the air distribution duct 31 with window cleaning branches does not have the function of rotating 360° around its own axis.

[0082] like Figure 7 As shown, the exhaust and dust removal unit 4 is located at the exhaust port 41 of the test chamber top cover 13, including an exhaust pipe 42 located at the exhaust port 41 of the test chamber top cover 13 and an exhaust fan connected to the exhaust pipe 42. After each test, the purging and cleaning unit 3 is started to purge and clean the residual powder adsorbed on the inner wall and windows of the chamber body 12. Then, in conjunction with the exhaust and dust removal unit 4, the exhaust fan extracts the flue gas and powder particles in the chamber body 12 after the test, achieving rapid and efficient cleaning of the chamber body 12.

[0083] In addition, the fan 28 installed on the bottom plate 123 of the main body 12 can also be used for dust removal. When cleaning the main body 12, the blowing and cleaning unit 3 and the fan 28 are started, in conjunction with the exhaust and dust removal unit 4.

[0084] like Figure 7 As shown, the lighting units are disposed on the inner surface of the top cover 13; as an example, on the inner surface of the top cover 13, one lighting unit is arranged on each side of the exhaust vent 41, and they are installed symmetrically from left to right. Each lighting unit includes two lighting lamps 14 arranged in front and behind, and the light intensity of the lighting lamps 14 is adjustable to meet different test requirements.

[0085] The sensor unit includes a concentration sensor and a temperature and humidity sensor 17; several temperature and humidity sensors 17 are arranged on the main body 12 of the enclosure, such as... Figure 4 As shown, it serves as a temperature and humidity monitoring point to monitor the temperature and humidity inside the main body 12 of the enclosure in real time.

[0086] In addition, several concentration sensors are arranged on the main body 12 of the box as concentration sampling points, and the concentration of powder particles inside the main body 12 of the box is sampled by the filtration method.

[0087] Furthermore, in order to control the temperature and humidity inside the main body 12 of the cabinet, a heating rod 15 and a spray unit 16 are provided on the inner surface of the top cover 13. The heating rod 15 controls the temperature inside the main body 12 by heating, and the spray unit 16 is connected to an external water pipe to spray water mist onto the main body 12 to regulate the humidity inside the main body 12.

[0088] As an example, when a spray unit 16 is provided on the inner surface of the top cover 13, a drain outlet is further provided on the bottom plate of the main body 12.

[0089] As an example, the test chamber also includes an integrated control console located outside the test chamber body, which is used to achieve integrated control of the feeding and dispersing unit 2, the blowing and cleaning unit 3, the exhaust and dust removal unit 4, the lighting unit, etc., as well as real-time display of the measurement data of the sensor unit.

[0090] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A powder dispersion test chamber, characterized in that: include: The enclosure (1) is equipped with an optical test window (122), a feeding and dispersing unit (2), a blowing and cleaning unit (3), an exhaust and dust removal unit (4) is installed on the enclosure (1), and a sensor unit and a lighting unit are installed inside the enclosure (1). The feeding and dispersing unit (2) is used to convey and disperse the powder material into the box (1); The purging and cleaning unit is used to purge and clean the residual powder material on the inner wall of the box (1) after the test; The exhaust and dust removal unit (4) is used to remove residual powder material from the box (1) after the test; The sensor unit is used to monitor the temperature and humidity inside the box (1) and the concentration of powder particles inside the box (1) in real time; The lighting unit is used to adjust the brightness inside the housing (1).

2. The powder dispersion test chamber as described in claim 1, characterized in that, The box (1) includes a lower support frame (11), a middle box body (12), and an upper top cover (13).

3. The powder dispersion test chamber as described in claim 1 or 2, characterized in that, The feeding and dispersing unit (2) includes: a hopper (21), a conveying unit (23), and a fan (28); The hopper (21) is used to hold powder materials; The lower end of the hopper (21) is connected to the feeding pipe (22), and the feeding pipe (22) is connected to the internal space of the box (1); The conveying unit (23) is used to convey the powder material in the feeding pipe (22) to the box (1); The box (1) is equipped with several fans (28) for stirring and dispersing the powder material delivered to the box (1).

4. The powder dispersion test chamber as described in claim 3, characterized in that, It also includes a blower (24), the outlet of which is connected to the feeding pipe (22) through the blowing pipe (26) to blow the powder material in the feeding pipe (22) into the box (1).

5. The powder dispersion test chamber as described in claim 1 or 2, characterized in that, The blowing and cleaning unit includes: a distribution duct (31) and an airflow nozzle (32); Several air distribution pipes (31) are provided inside the housing (1), and the air distribution pipes (31) are connected to the air compressor through an external air inlet pipe; The air distribution pipe (31) is provided with several airflow nozzles (32) connected to it, which are used to blow out positive pressure airflow.

6. The powder dispersion test chamber as described in claim 5, characterized in that, The air distribution duct (31) is capable of rotating around its own axis.

7. The powder dispersion test chamber as described in claim 5, characterized in that, The purging and cleaning unit also includes a window cleaning branch for cleaning the optical test window (122) and protecting the airflow; The window cleaning branch is led out from the air distribution pipe (31) and includes: a branch pipe connected to the air distribution pipe (31) and an annular pipe connected to the branch; a number of airflow nozzles are arranged circumferentially on the annular pipe, and the airflow nozzles are connected to the annular pipe, thereby forming a surrounding airflow branch. The diameter of the annular tube is larger than the diameter of the optical test window (122).

8. The powder dispersion test chamber as described in claim 1 or 2, characterized in that, The exhaust dust removal unit (4) is located at the exhaust port (41) of the housing (1), and includes an exhaust pipe (42) connected to the exhaust port (41) and an exhaust fan connected to the exhaust pipe (42).

9. The powder dispersion test chamber as described in claim 1 or 2, characterized in that, The housing (1) is also equipped with a heating rod (15) and / or a spray unit (16). The heating rod (15) is used to regulate the temperature inside the box (1); The spray unit (16) is used to spray water mist into the box (1) to regulate the humidity inside the box (1).

10. The powder dispersion test chamber as described in claim 1 or 2, characterized in that, It also includes an integrated control console, which is arranged outside the housing (1) to realize integrated control of the feeding and dispersing unit (2), the blowing and cleaning unit (3), the exhaust and dust removal unit (4) and the lighting unit, as well as real-time display of the measurement data of the sensor unit.

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