An experimental freeze spray dryer chamber

Abstract

This utility model discloses an experimental cryogenic spray dryer chamber, relating to the technical field of cryogenic spray dryer chambers. It includes a top cover assembly, an observation window, and a bottom pot assembly arranged sequentially from top to bottom. The observation window has a first chamber. The top cover assembly includes a spray gun, the outlet of which is connected to the first chamber. The spray gun is used to spray molten material into fine droplets to enter the first chamber. The bottom pot assembly includes a bottom pot with a second chamber, a separation cone cap located within the second chamber, and an air outlet pipe connected to the second chamber. The second chamber is connected to the first chamber. An airflow channel is formed between the outer wall of the separation cone cap and the inner wall of the bottom pot. The cross-sectional size of the airflow channel gradually decreases from top to bottom. The air outlet pipe is used to discharge the gas flowing out of the airflow channel to the outside of the second chamber. Larger finished particles can be collected in a collection tank below the bottom pot in one go, effectively improving the problem of the cumbersome collection of large finished particles in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of cryo-spray dryer cavity technology, and in particular to an experimental cryo-spray dryer cavity. Background Technology

[0002] Current laboratory-type freeze spray dryers typically use a single glass chamber or a single stainless steel structure with a glass viewing window to accommodate observation of the spray gun status or for heat preservation. Due to this structure, most of the finished particles cannot be collected in the collection tank at the bottom of the drying chamber by gravity alone, requiring an external cyclone separator for secondary collection, which makes particle collection quite troublesome. Furthermore, the freeze drying chambers in existing technologies are very inconvenient to disassemble and clean, seriously affecting the user experience.

[0003] Therefore, how to provide an experimental cryogenic spray dryer cavity that at least partially improves the above-mentioned drawbacks is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to provide an experimental freeze spray dryer cavity in which larger finished particles can be collected in a collection tank below the bottom pot in one go, without the need for secondary collection, which can effectively improve the problem of the cumbersome collection of larger finished particles in the prior art.

[0005] To achieve the above objectives, this utility model provides an experimental freeze spray dryer cavity, comprising a top cover assembly, an observation window, and a bottom pot assembly arranged sequentially from top to bottom. The observation window has a first chamber. The top cover assembly includes a spray gun, the outlet of which is connected to the first chamber. The spray gun is used to spray molten material into fine droplets to enter the first chamber. The bottom pot assembly includes a bottom pot with a second chamber, a separation cone located in the second chamber, and an air outlet pipe connected to the second chamber. The second chamber is connected to the first chamber. An airflow channel is formed between the outer wall of the separation cone and the inner wall of the bottom pot. The cross-sectional size of the airflow channel gradually decreases from top to bottom. The air outlet pipe is used to discharge the gas flowing out of the airflow channel to the outside of the second chamber.

[0006] In one possible implementation, the top cover assembly further includes:

[0007] The spray gun is fitted with a PTFE sleeve around its outer perimeter.

[0008] The spray gun insulation sleeve includes a cylinder fitted around the periphery of the spray gun PTFE sleeve and a mounting plate connected to the top of the cylinder.

[0009] The top cover has a through hole for receiving the cylinder, and a mounting plate is used to connect to the top of the top cover after the cylinder is inserted into the through hole, so that the cylinder is fixed relative to the top cover.

[0010] In one possible implementation, a fixing component for fixing the viewing window is also included, the fixing component comprising:

[0011] The upper flange is located at the top of the observation window. A silicone gasket is provided between the upper flange and the observation window. The upper flange has a first connection hole in its circumference.

[0012] The lower flange is located at the bottom of the observation window. A silicone gasket is provided between the lower flange and the observation window. The lower flange has a second connection hole in its circumference.

[0013] A support rod is provided around the observation window. The support rod includes a first connector and a second connector. The first connector is connected to a first connecting hole, and the second connector is connected to a second connecting hole, so that the upper flange and the lower flange clamp the observation window in the extension direction of the support rod.

[0014] In one possible implementation, the upper flange is connected to the bottom of the top cover, and a first inflatable sealing ring is installed at the bottom of the top cover for sealing between the upper flange and the top cover.

[0015] The lower flange is connected to the top of the bottom pot, and a second inflatable sealing ring is installed on the top of the bottom pot for sealing between the lower flange and the bottom pot.

[0016] In one possible implementation, the spray gun insulation sleeve is provided with a first hollow interlayer, which is used to fill the first insulation material.

[0017] The top cover has a second hollow interlayer, which is used to fill the second insulation material.

[0018] In one possible implementation, the bottom pot includes a first pot body and a second pot body located below the first pot body. The second pot body includes a first connecting end with a larger cross-sectional diameter and a second connecting end with a smaller cross-sectional diameter. The first connecting end is connected to the bottom of the first pot body so that the inner walls of the first pot body and the second pot body together form a second chamber. The second connecting end is used to connect to a receiving tank for collecting finished product particles, and a valve is provided between the second connecting end and the receiving tank for connecting and disconnecting the second chamber and the receiving tank.

[0019] In one possible implementation, the separating cone cap includes a first cap body located inside the first pot body and a second cap body located below the first cap body. The first cap body includes a first end with a smaller cross-sectional diameter and a second end with a larger cross-sectional diameter. The second cap body is connected to the second end and is located inside the second pot body.

[0020] The airflow channel includes a first channel and a second channel that are connected. The first channel is formed between the outer wall of the first cap and the inner wall of the first pot, and the second channel is formed between the outer wall of the second cap and the inner wall of the first pot.

[0021] In one possible implementation, the bottom pot has a first opening, the separating cone cap has a second opening, the air outlet pipe passes through the first opening and is fixed to the separating cone cap so that the separating cone cap is fixed relative to the bottom pot, and the air outlet pipe is connected to the second opening.

[0022] In one possible implementation, the first pot body is also connected to a position sensor, the top of which is located above the first pot body. The position sensor is used to detect the observation window, and when the position sensor detects the observation window, the first and second inflatable sealing rings are inflated for sealing.

[0023] In one possible implementation, the axis of the separating cone cap is collinear with the axis of the bottom pot.

[0024] Compared with the prior art, the technical solution provided by this utility model has at least the following beneficial effects: the fine droplets sprayed from the spray gun come into contact with the low-temperature airflow in the first chamber, and the droplets are used to solidify to form finished particles. An airflow channel is formed between the outer wall of the separation cone and the inner wall of the bottom pot. The cross-sectional size of the airflow channel gradually decreases from top to bottom, so that when the process air carrying finished particles and fine powder blows from top to bottom through the separation cone, the cross-sectional area that can pass through becomes smaller and the wind speed becomes faster. This can effectively reduce the adhesion of finished particles and fine powder in the airflow channel. After the process air carrying finished particles and fine powder flows out of the airflow channel, the larger finished particles are separated by gravity and fall into the bottom pot and are collected. The smaller fine powder is discharged to the outside of the second chamber through the air outlet pipe with the process air. By setting the separation cone, the larger finished particles can be collected in the receiving tank under the bottom pot in one go, without secondary collection, which can effectively improve the problem of the more troublesome collection of larger finished particles in the prior art. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of 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 only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the experimental freeze spray dryer cavity provided in an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the top cover assembly provided in an embodiment of the present utility model;

[0028] Figure 3 This is a schematic diagram of the structure of the fixing component provided in an embodiment of the present utility model;

[0029] Figure 4 This is a schematic diagram of the structure of the bottom pot assembly provided in an embodiment of the present utility model;

[0030] Figure 5 A partial cross-sectional view of the bottom pot assembly provided in an embodiment of this utility model;

[0031] Figure 6 This is a partial cross-sectional view of the separating cone cap provided in an embodiment of the present utility model.

[0032] in:

[0033] 1-Top cover assembly, 1.1-Spray gun, 1.2-Spray gun PTFE sleeve, 1.3-Spray gun insulation sleeve, 1.4-Top cover, 1.5-Locking pin, 1.6-First inflatable sealing ring;

[0034] 2-Fixing component, 2.1-Upper flange, 2.2-Silicone gasket, 2.3-Support rod, 2.4-Observation window, 2.5-Lower flange;

[0035] 3-Bottom pot assembly, 3.1-Second air-filled sealing ring, 3.2-Separation cone cap, 3.21-Handle, 3.22-First cap body, 3.23-Ventilation column, 3.24-Anti-wear sleeve, 3.3-Position sensor, 3.4-Bottom pot, 3.5-Temperature probe, 3.6-Air outlet pipe, 3.7-Valve, 3.8-Collection container. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of this utility model.

[0039] The purpose of this invention is to provide an experimental freeze spray dryer cavity in which larger finished particles can be collected in a collection tank below the bottom pot in one go, without the need for secondary collection, which can effectively improve the problem of the cumbersome collection of larger finished particles in the prior art.

[0040] Please see Figures 1 to 4 To achieve the above objectives, this utility model provides an experimental freeze spray dryer cavity, comprising a top cover assembly 1, an observation window 2.4, and a bottom pot assembly 3 arranged sequentially from top to bottom. The observation window 2.4 has a first chamber and is made of transparent material to facilitate observation of the atomization state of the material. The top cover assembly 1 includes a spray gun 1.1, the outlet of which is connected to the first chamber. The spray gun 1.1 is used to spray molten material into fine droplets to enter the first chamber. The bottom pot assembly 3 includes a bottom pot 3.4 with a second chamber, a separation cone 3.2 located in the second chamber, and an air outlet pipe 3.6 connected to the second chamber. The second chamber is connected to the first chamber. The axis of the separation cone 3.2 is collinear with the axis of the bottom pot 3.4, and an air flow channel is formed between the outer wall of the separation cone 3.2 and the inner wall of the bottom pot 3.4. The cross-sectional size of the air flow channel gradually decreases from top to bottom. The air outlet pipe 3.6 is used to discharge the gas flowing out of the air flow channel to the outside of the second chamber.

[0041] The fine droplets sprayed from the spray gun 1.1 come into contact with the low-temperature airflow in the first chamber, allowing the droplets to solidify and form finished particles. An airflow channel is formed between the outer wall of the separation cone 3.2 and the inner wall of the bottom pot 3.4. The cross-sectional size of the airflow channel gradually decreases from top to bottom, so that when the process air carrying finished particles and fine powder blows from top to bottom through the separation cone 3.2, the cross-sectional area that can pass through is smaller and the wind speed is faster. This effectively reduces the adhesion of finished particles and fine powder in the airflow channel. After the process air carrying finished particles and fine powder flows out of the airflow channel, the larger finished particles are separated by gravity and fall into the bottom pot 3.4 and are collected. The smaller fine powder is discharged to the outside of the second chamber through the air outlet pipe 3.6 with the process air. By setting the separation cone 3.2, the larger finished particles can be collected in the receiving tank 3.8 below the bottom pot 3.4 in one go, without secondary collection, which can effectively improve the problem of the more troublesome collection of larger finished particles in the prior art.

[0042] In one possible implementation, the top cover assembly 1 further includes a spray gun PTFE sleeve 1.2, a spray gun insulation sleeve 1.3, and a top cover 1.4. The spray gun PTFE sleeve 1.2 is fitted around the outer periphery of the spray gun 1.1, that is, the spray gun 1.1 is installed inside the spray gun PTFE sleeve 1.2, which can effectively prevent the spray gun 1.1 from being scratched when disassembling and assembling it. The spray gun insulation sleeve 1.3 includes a cylindrical body fitted around the outer periphery of the spray gun PTFE sleeve 1.2 and a mounting plate connected to the top of the cylindrical body. The spray gun insulation sleeve 1.3 is provided with a first hollow interlayer, which is used to fill a first insulation material. The mounting plate may be provided with a first mounting hole, and the top cover 1.4. 4. A through hole is provided for accommodating the cylinder body. The top of the top cover 1.4 is also provided with a second mounting hole. The mounting plate is used to connect the cylinder body to the top of the top cover 1.4 by bolts after the cylinder body is inserted into the through hole, so that the cylinder body is fixed relative to the top cover 1.4. Specifically, the bolts are inserted into the corresponding first mounting hole and second mounting hole to realize the detachable connection between the spray gun insulation sleeve 1.3 and the top cover 1.4. The top cover 1.4 is provided with a second hollow interlayer. The second hollow interlayer is used to fill the second insulation material. The first insulation material and the second insulation material can be the same insulation material, as long as the insulation effect can be achieved. No specific limitation is made here.

[0043] In one possible implementation, a fixing component 2 for fixing the observation window 2.4 is also included. The fixing component 2 includes an upper flange 2.1, a lower flange 2.5, and a support rod 2.3. The upper flange 2.1 is located at the top of the observation window 2.4, and a silicone gasket 2.2 is provided between the upper flange 2.1 and the observation window 2.4. The upper flange 2.1 has a first connecting hole circumferentially arranged, and the first connecting holes are evenly distributed circumferentially on the upper flange 2.1, with the number of first connecting holes being three. The lower flange 2.5 is located at the bottom of the observation window 2.4, and a silicone gasket 2.2 is also provided between the lower flange 2.5 and the observation window 2.4. The lower flange 2.5 has a second connecting hole circumferentially arranged, and the second connecting hole is located at the bottom of the lower flange 2.5. The second connecting holes are evenly arranged circumferentially, and the number of holes can be set to three. The silicone pad 2.2 and the observation window 2.4 can be made of antistatic material. The support rod 2.3 is arranged circumferentially around the observation window 2.4. The support rod 2.3 corresponds one-to-one with the first connecting hole and the second connecting hole. The support rod 2.3 includes a first connector and a second connector, which are located at both ends of the support rod 2.3. The first connector is connected to the first connecting hole, and the second connector is connected to the second connecting hole, so that the upper flange 2.1 and the lower flange 2.5 clamp the observation window 2.4 in the extension direction of the support rod 2.3, and the silicone pad 2.2 provides cushioning to prevent the observation window 2.4 from being cracked.

[0044] In one possible implementation, the bottom pot 3.4 includes a first pot body and a second pot body located below the first pot body. The first pot body has a hollow cylindrical structure, and the second pot body has a hollow inverted frustum structure. The side walls of the first and second pot bodies are provided with cavities for placing insulation material to achieve the insulation effect of the bottom pot 3.4. The second pot body includes a first connecting end with a larger cross-sectional diameter and a second connecting end with a smaller cross-sectional diameter. The first connecting end is connected to the bottom of the first pot body so that the inner walls of the first and second pot bodies together form a second chamber. The inner wall of the second pot body is conical to facilitate guiding the finished product particles from the first connecting end to the second connecting end for collection. The second connecting end is used to connect to the collection... The receiving tank 3.8 for the integrated pellets can be detachably connected to the second connecting end via clamps. A valve 3.7 is provided between the second connecting end and the receiving tank 3.8. The valve 3.7 can be, but is not limited to, a manual butterfly valve, and is used to connect and disconnect the second chamber and the receiving tank 3.8. Specifically, when the receiving tank 3.8 is connected to the bottom of the second connecting end for receiving, the valve 3.7 is open, allowing the finished pellets to move into the receiving tank 3.8 for collection. When the receiving tank 3.8 needs to be removed for unloading, the valve 3.7 can be closed and the receiving tank 3.8 can be removed. The finished pellets in the second chamber will gather at the bottom of the second pot, so that the entire unloading process does not require stopping the machine.

[0045] In one possible implementation, the upper flange 2.1 is connected to the bottom of the top cover 1.4, and the bottom of the top cover 1.4 is provided with a locking pin 1.5 for detachable connection between the top cover 1.4 and the upper flange 2.1. A first inflatable sealing ring 1.6 is installed at the bottom of the top cover 1.4 for sealing between the upper flange 2.1 and the top cover 1.4. The lower flange 2.5 is connected to the top of the bottom pot 3.4, and a second inflatable sealing ring 3.1 is installed at the top of the bottom pot 3.4 for sealing between the lower flange 2.5 and the bottom pot 3.4. The first pot body is also connected to a position sensor 3.3. The top of the position sensor 3.3 is located above the first pot body. The position sensor 3.3 is used to detect the observation window 2.4. When the observation window 2.4 is installed and the position sensor 3.3 detects the observation window 2.4, the first inflation sealing ring 1.6 and the second inflation sealing ring 3.1 are inflated for sealing. Specifically, the first inflation sealing ring 1.6 expands during inflation to form a sealing contact with the upper flange 2.1 and the top cover 1.4, and the second inflation sealing ring 3.1 expands during inflation to form a sealing contact with the lower flange 2.5 and the first pot body. The sealing mechanism is designed to facilitate the disassembly and cleaning of the observation window 2.4 and the bottom pot 3.4. When it is necessary to disassemble the observation window 2.4 for internal cleaning, the air can be released through the first inflatable sealing ring 1.6 and the second inflatable sealing ring 3.1 to detach from the sealing surface. Then, the observation window 2.4 can be disassembled. The observation window 2.4 has a hollow cylindrical structure, and the bottom pot 3.4 is a combination of a hollow cylindrical structure and a hollow inverted frustum structure. This design facilitates the disassembly and cleaning of the observation window 2.4 and the bottom pot 3.4, solving the problem of inconvenience in disassembling and cleaning the freeze-drying chamber in the prior art, thereby improving the user experience.

[0046] Please see Figure 5 and Figure 6 In one possible implementation, the separating cone cap 3.2 includes a first cap 3.22 located inside the first pot body and a second cap located below the first cap 3.22. The first cap 3.22 has a conical structure, and the second cap has an annular structure. The first cap 3.22 includes a first end with a smaller cross-sectional diameter and a second end with a larger cross-sectional diameter. The second cap is connected to the second end and is located inside the second pot body. The airflow channel includes a first channel and a second channel that are connected. The first channel is formed between the outer wall of the first cap 3.22 and the inner wall of the first pot body, and the second channel is formed between the outer wall of the second cap and the inner wall of the first pot body.

[0047] It should be noted that the inner wall of the first pot body forming the first flow channel between the outer wall of the first cap 3.22 and the outer wall of the first cap 3.22 refers to the inner wall of the first pot body at the same height as the outer wall of the first cap 3.22. Similarly, the inner wall of the second pot body forming the second flow channel between the outer wall of the second cap body and the outer wall of the second cap body refers to the inner wall of the second pot body at the same height as the outer wall of the second cap body. The process air first passes through the first flow channel, and then flows through the second flow channel to the bottom of the second cap body. The cross-sectional area of ​​the second flow channel is smaller in the vertical direction, which makes the air velocity in the second flow channel faster. This accelerates the passage of larger finished product particles and smaller fine powder with the process air through the second flow channel. Then, the larger finished product particles fall to the bottom of the second pot body under their own weight, and the smaller fine powder enters the air outlet pipe 3.6 with the process air and then enters the filtration system connected to the air outlet pipe 3.6.

[0048] In one possible implementation, the bottom pot 3.4 has a first opening, and the separation cone cap 3.2 has a second opening. An air outlet pipe 3.6 passes through the first opening and is fixedly connected to the bottom pot 3.4. One end of the air outlet pipe 3.6 extending into the second chamber is fixed to the separation cone cap 3.2. This fixing method can be, but is not limited to, welding, to fix the separation cone cap 3.2 relative to the bottom pot 3.4. The air outlet pipe 3.6 communicates with the second opening, allowing process air to enter the air outlet pipe 3.6 along the second opening. The air outlet pipe 3.6 can be a bend that is easy to install, and a temperature probe 3.5 can be installed on the portion of the bend outside the second chamber to detect the temperature of the process air flowing through the temperature probe 3.5. The separation cone cap 3.2 also has a handle 3.21 for easy gripping. A ventilation column 3.23 is provided inside the separation cone cap 3.2, and an anti-wear sleeve 3.24 is embedded in the inner wall of the ventilation column 3.23 to prevent damage to the separation cone cap 3.2 during installation and disassembly.

[0049] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0050] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0051] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. An experimental freeze spray dryer cavity, characterized in that, The device includes a top cover assembly (1), an observation window (2.4), and a bottom pot assembly (3) arranged sequentially from top to bottom. The observation window (2.4) has a first chamber. The top cover assembly (1) includes a spray gun (1.1), the outlet of which is connected to the first chamber. The spray gun (1.1) is used to spray molten material into fine droplets to enter the first chamber. The bottom pot assembly (3) includes a bottom pot (3.4) with a second chamber, a separation cone cap (3.2) located in the second chamber, and an air outlet pipe (3.6) connected to the second chamber. The second chamber is connected to the first chamber. An airflow channel is formed between the outer wall of the separation cone cap (3.2) and the inner wall of the bottom pot (3.4). The cross-sectional size of the airflow channel gradually decreases from top to bottom. The air outlet pipe (3.6) is used to discharge the gas flowing out of the airflow channel to the outside of the second chamber.

2. The experimental freeze spray dryer cavity according to claim 1, characterized in that, The top cover assembly (1) also includes: A PTFE sleeve (1.2) is fitted around the outer periphery of the spray gun (1.1); The spray gun insulation sleeve (1.3) includes a cylindrical body fitted around the outer periphery of the spray gun PTFE sleeve (1.2) and a mounting plate connected to the top of the cylindrical body; The top cover (1.4) has a through hole for receiving the cylinder, and the mounting plate is used to connect to the top of the top cover (1.4) after the cylinder is inserted into the through hole, so that the cylinder is fixed relative to the top cover (1.4).

3. The experimental freeze spray dryer cavity according to claim 2, characterized in that, It also includes a fixing component (2) for fixing the viewing window (2.4), the fixing component (2) comprising: An upper flange (2.1) is located at the top of the observation window (2.4), and a silicone gasket (2.2) is provided between the upper flange (2.1) and the observation window (2.4). The upper flange (2.1) has a first connecting hole in its circumference. The lower flange (2.5) is located at the bottom of the observation window (2.4), and a silicone gasket (2.2) is provided between the lower flange (2.5) and the observation window (2.4). The lower flange (2.5) has a second connection hole in its circumference. A support rod (2.3) is disposed around the observation window (2.4). The support rod (2.3) includes a first connector and a second connector. The first connector is connected to the first connecting hole, and the second connector is connected to the second connecting hole, so that the upper flange (2.1) and the lower flange (2.5) clamp the observation window (2.4) in the extension direction of the support rod (2.3).

4. The experimental freeze spray dryer cavity according to claim 3, characterized in that, The upper flange (2.1) is connected to the bottom of the top cover (1.4), and a first inflatable sealing ring (1.6) is installed at the bottom of the top cover (1.4) for sealing between the upper flange (2.1) and the top cover (1.4); The lower flange (2.5) is connected to the top of the bottom pot (3.4), and a second inflatable sealing ring (3.1) is installed on the top of the bottom pot (3.4) for sealing between the lower flange (2.5) and the bottom pot (3.4).

5. The experimental freeze spray dryer cavity according to claim 3, characterized in that, The spray gun insulation sleeve (1.3) is provided with a first hollow interlayer, which is used to fill the first insulation material; The top cover (1.4) is provided with a second hollow interlayer, which is used to fill a second thermal insulation material.

6. The experimental freeze spray dryer cavity according to claim 4, characterized in that, The bottom pot (3.4) includes a first pot body and a second pot body located below the first pot body. The second pot body includes a first connecting end with a larger cross-sectional diameter and a second connecting end with a smaller cross-sectional diameter. The first connecting end is connected to the bottom of the first pot body so that the inner walls of the first pot body and the second pot body together form the second chamber. The second connecting end is used to connect to a receiving tank (3.8) for collecting finished particles, and a valve (3.7) is provided between the second connecting end and the receiving tank (3.8) for connecting and disconnecting the second chamber and the receiving tank (3.8).

7. The experimental freeze spray dryer cavity according to claim 6, characterized in that, The separating cone cap (3.2) includes a first cap body (3.22) located inside the first pot body and a second cap body located below the first cap body (3.22). The first cap body (3.22) includes a first end with a smaller cross-sectional diameter and a second end with a larger cross-sectional diameter. The second cap body is connected to the second end and is located inside the second pot body. The airflow channel includes a first channel and a second channel that are connected to each other. The first channel is formed between the outer wall of the first cap (3.22) and the inner wall of the first pot body, and the second channel is formed between the outer wall of the second cap and the inner wall of the first pot body.

8. The experimental freeze spray dryer cavity according to claim 6, characterized in that, The bottom pot (3.4) has a first opening, the separation cone cap (3.2) has a second opening, the air outlet pipe (3.6) passes through the first opening and is fixed to the separation cone cap (3.2) so that the separation cone cap (3.2) is fixed relative to the bottom pot (3.4), and the air outlet pipe (3.6) is connected to the second opening.

9. The experimental freeze spray dryer cavity according to claim 6, characterized in that, The first pot body is also connected to a position sensor (3.3). The top of the position sensor (3.3) is located above the first pot body. The position sensor (3.3) is used to detect the observation window (2.4). When the position sensor (3.3) detects the observation window (2.4), the first inflatable sealing ring (1.6) and the second inflatable sealing ring (3.1) are inflated for sealing.

10. The experimental freeze spray dryer cavity according to any one of claims 1-9, characterized in that, The axis of the separating cone cap (3.2) is collinear with the axis of the bottom pot (3.4).

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