A convexly curved surface isolation cabin and closed dust removal equipment

Abstract

The utility model discloses an inner convex curved surface isolation cabin, including the main cabin body who arranges along the horizontal direction, the first end surface and the second end surface of main cabin body have the opening, the inside top surface of main cabin body and lateral wall are continuous inner convex curved surface, form the airflow channel who extends from the first end surface to the second end surface, be provided with the air supply system at the first end surface, the air supply system includes the air blower of surrounding at the first end surface a plurality of, and the annular flow guide structure who is connected with the inner wall of main cabin body, be provided with the negative pressure exhaust system at the second end surface, this technical scheme forms the air current of sticking to the wall through the air path optimization, provides stable low wind speed area in the equipment, not only can effectively maintain the running environment stability of powder production equipment in the isolation cabin, can also prevent the powder outside leak, guarantees the production safety.

Description

Technical Field

[0001] This utility model belongs to the technical field of dust removal and protection equipment, specifically relating to an internally convex curved surface isolation chamber and a closed dust removal device. Background Technology

[0002] Nanoparticles, due to their ultra-high surface area ratio and unique surface chemical properties, have found wide applications in electronics, energy, catalysts, and other fields. However, during the production and processing of nanoparticles, high concentrations of suspended particles are easily formed. These particles, with their extremely small size, can penetrate deep into the lungs through the respiratory system, triggering inflammatory responses, oxidative stress, and even cell apoptosis. Long-term exposure may also harm the cardiovascular and central nervous systems. Furthermore, some nanomaterials possess toxic properties and can interact adversely with human tissues; therefore, effective isolation and control of dust dispersion are necessary in practical operations.

[0003] Traditional dust control methods in nanomaterial production environments primarily rely on direct exhaust dust collection equipment and fixed filtration systems. These systems typically employ centralized airflow control and often depend on high-velocity direct adsorption, which can easily lead to turbulence. This prevents the effective removal of some nanoparticles, causing secondary environmental pollution, affecting overall dust collection efficiency, and impacting equipment. Furthermore, excessively high airflow rates can directly and adversely affect equipment. Using only high-velocity direct exhaust may not only reduce process stability but also lead to resource waste or new leakage risks (during material feeding and discharging).

[0004] For example, Chinese patent document CN201604211U discloses a press active dust removal chamber. This patent mainly addresses the dust problem during the operation of ceramic presses, proposing the use of a closed cover with an openable door and a negative pressure dust suction port at the top, aiming to improve dust suction efficiency through a partially enclosed space, and to facilitate cleaning and maintenance.

[0005] While such devices are effective in macroscopic dust environments, their design focuses more on physical shielding and spatial convenience, resulting in the following structural and mechanistic limitations when processing nanoparticles with a particle size of less than 100 nm:

[0006] 1. Applicable to different powder sizes: The active dust removal chamber of the press is mainly for large-particle dust such as ceramics. Its air outlet is located at the top and has not been optimized for the gas diffusion path of submicron and nano-sized particles. Nano-particles are prone to diffusion due to Brownian motion and low mass, and it is difficult to form an effective collection area by relying solely on top suction.

[0007] 2. Unorganized airflow design within the main compartment: In the aforementioned patent documents, the device did not systematically design the internal airflow streamlines. The airflow movement in its closed structure lacked continuous guidance, which easily led to backflow, dead zones, or circulating eddies inside, causing uncontrollable dust accumulation or migration.

[0008] 3. Lack of fine flow field control: The existing dust removal chamber does not have airflow velocity zoning or wind speed control functions, and cannot form a "low speed and low disturbance" collection environment for the core operating area, which greatly interferes with nano-preparation equipment or detection equipment that require a stable operating environment. Utility Model Content

[0009] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0010] A convex curved isolation chamber, comprising:

[0011] The main cabin is arranged horizontally and has an open first end face and a second end face. The top surface and side walls inside the main cabin are continuous convex curved surfaces, forming an airflow channel extending from the first end face to the second end face.

[0012] An air supply system is provided at the first end face. The air supply system includes a plurality of fans surrounding the first end face and an annular flow guide structure connected to the inner wall of the main cabin.

[0013] A negative pressure ventilation system is installed at the second end face;

[0014] Under the action of the air supply system and the negative pressure exhaust system, a soft air zone is formed in the airflow channel, which can accommodate the operating equipment.

[0015] Furthermore, the second end face is also connected to a ventilation duct, and at least one layer of filter screen is provided between the negative pressure exhaust system and the ventilation duct.

[0016] Furthermore, the number of wind turbines is 6 to 12.

[0017] Furthermore, the opening gradually narrows radially inward from the first end face to the second end face.

[0018] This utility model also discloses a closed dust removal device, including the aforementioned inner convex curved surface isolation chamber and several support columns. The support columns are arranged sequentially along the inner convex curved surface isolation chamber and support the inner convex curved surface isolation chamber upward.

[0019] Furthermore, the convex curved isolation chamber also contains a broad-spectrum analyzer, which is deployed within the soft wind zone.

[0020] Compared with the prior art, this utility model has the following advantages:

[0021] This technical solution proposes a sealed safety chamber design with a low-speed airflow zone. Through airflow optimization, a stable soft airflow zone is formed by utilizing wall-mounted airflow. This design not only effectively controls the diffusion of nanoparticles but also protects the operating environment of the central equipment, providing an innovative solution for safe and efficient nanoparticle production.

[0022] Effective dust removal for submicron and nano-sized powders is achieved through a continuous flow path. Optimized airflow path design via internal directional airflow ensures efficient dust collection and purification, avoiding the impact of airflow disturbances on the powder. A stable, soft airflow zone is created, preventing interference and impact from high-speed airflow on powder handling and detection equipment. Attached Figure Description

[0023] Figure 1 A three-dimensional structural diagram of a dust removal device with an internally convex curved isolation chamber;

[0024] Figure 2 for Figure 1 A schematic diagram of the left-side view structure;

[0025] Figure 3 for Figure 1 Front view structural diagram;

[0026] Figure 4 for Figure 1 A schematic diagram of the three-dimensional structure from another perspective;

[0027] Figure 5 This is a schematic diagram of the structure of a nanosafety cabin;

[0028] Figure 6 A schematic diagram of the fluid domain inside the safety cabin;

[0029] Figure 7 For the internal airflow path of the nanosafety cabin Figure 1 ;

[0030] Figure 8 For the internal airflow path of the nanosafety cabin Figure 2 ;

[0031] Figure 9 The diagram shows the airflow simulation results (yz plane) of the safety cabin structure without any internal equipment installed.

[0032] The reference numerals in the accompanying drawings include:

[0033] Main cabin 1, first end face 10, door 100, observation window 101, second end face 11, nested interface 12, fan 2, annular flow guide structure 3, negative pressure exhaust system 4, soft air zone 5, ventilation duct 6, filter screen 7, support column 8, broad spectrum analyzer 90, operating equipment 91. Detailed Implementation

[0034] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0035] The accompanying drawings are for illustrative purposes only and represent schematic diagrams, not actual physical objects. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The same or similar reference numerals in the drawings of the embodiments of this utility model correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" appear, indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships in the drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0036] like Figure 1 - Figure 9 As shown, this embodiment is a safety cabin for a horizontal nanopowder material production equipment. The shape of its main cabin 1 can be designed as, but is not limited to, a cuboid, a cylinder, an elliptical cylinder, or other composite geometric structures. The main cabin 1 is arranged in a horizontal direction.

[0037] In this embodiment, the main cabin 1 has a fixed inwardly convex curved surface flow guide structure. Its top and side walls are continuous inwardly convex surfaces with rounded transitions, and its bottom is a flat horizontal plane without curvature.

[0038] The main body 1 has an open first end face 10 and a second end face 11. The top surface and side wall inside the main body 1 are continuous convex curved surfaces, forming an airflow channel extending from the first end face 10 to the second end face 11. The top and side walls adopt a continuous convex curved surface design to guide the airflow to form a stable wall-attached flow along the upper and side wall surfaces inside the main body 1.

[0039] The left side is the airflow inlet end, where 6 to 12 fans 2 / blowers are arranged, and the wind speed is controlled at 4 to 6 meters per second through the annular guide structure 3. The annular guide structure 3 adopts an annular guide (plate) structure with a length of 1.0m, a height of 2.45m, and a width of 2.94m. The airflow is evenly introduced into the interior of the main cabin 1 through the guide plate and flows from left to right, adhering to the inner wall.

[0040] A negative pressure exhaust outlet is provided on the right side, which forms a stable parallel airflow field in a closed environment, effectively controlling the diffusion path of nanoparticles and avoiding the risk of secondary pollution caused by airflow turbulence.

[0041] The length, width, and height of the main chamber 1 can be flexibly customized according to the size of the equipment to be protected or the operating equipment 91 / platform / powder detection equipment. The recommended range is 4 to 8 meters in length, 3 to 6 meters in width, and 2 to 4 meters in height. It is suitable for various horizontally arranged production devices or nanopowder processing systems and has good adaptability and engineering practicality.

[0042] The specific external dimensions of the main cabin 1 in this embodiment are: length 5.5 m, width 3.6 m, and height 3.0 m.

[0043] The top of the entire main cabin 1 is designed as a continuous inward convex curved surface to guide horizontal airflow and achieve a wall-hugging flow effect.

[0044] This technical solution proposes a sealed safety chamber design with a low-speed airflow zone. Through airflow optimization, a stable soft airflow zone is formed by utilizing wall-mounted airflow. This design not only effectively controls the diffusion of nanoparticles but also protects the operating environment of the central equipment, providing an innovative solution for safe and efficient nanoparticle production.

[0045] Effective dust removal for submicron and nano-sized powders is achieved through a continuous flow path. Optimized airflow path design via internal directional airflow ensures efficient dust collection and purification, avoiding the impact of airflow disturbances on the powder. A stable soft air zone 5 is formed to prevent interference and impact of high-speed airflow on powder handling and detection equipment.

[0046] In order to achieve stable wall-adhering flow and effective control of the central soft air zone 5, the convex curved surface structure of the top and side walls in this invention adopts a rounded transition form.

[0047] Furthermore, the nanopowder production equipment is located in the central area of ​​the main chamber 1, ensuring a soft airflow zone 5 around the equipment and avoiding direct interference from excessive airflow. The central soft airflow zone 5 generates a low-speed breeze due to pressure differences. The soft airflow zone 5 has a wind speed of 0.3–1.5 m / s. At extremely low wind speeds, the airflow causes minimal disturbance to the nanopowder; the powder is primarily affected by Brownian motion or extremely weak airflow, eventually being carried away from the extremely low-speed airflow zone for effective removal.

[0048] An air supply system is located on the left side of the main cabin 1. An annular flow guide structure 3 is configured in the inlet area. The flow guide structure is fixed inside the cabin by a support member. Its upper edge is located on the convex curved surface adjacent to the cabin, and its bottom is connected to the bottom of the flat surface. It is used to uniformly distribute and guide the incoming airflow. The air outlet is a continuous arc-shaped strip structure along the width of the cabin. The cross-section is a curved rectangle with a rounded transition, so that the incoming airflow is uniformly distributed and has certain wall-adhering guiding characteristics before entering the cabin. The air supply velocity is controlled at 4 to 6 m / s to form a stable and uniformly distributed horizontal airflow field inside the cabin 1.

[0049] Guided by the convex surfaces of the top and side walls, the introduced airflow adheres to these surfaces, preventing streamlines from detaching and causing airflow turbulence or central turbulence. The airflow surrounding the inner walls and top naturally separates from the soft wind zone 5, and the overall airflow flows along the convex surfaces towards the outlet, forming a clear and stable flow structure that ensures the stability and safety of the internal environment of the main cabin 1.

[0050] Meanwhile, the bottom plane area is designed as the equipment layout area for the operating equipment 91 / platform. The airflow velocity in this area is controlled at 0.3 to 1.5 m / s, which is designated as the soft air zone 5 to reduce powder disturbance and prevent interference from high-speed airflow on equipment operation. A broad-spectrum analyzer 90 is installed in the soft air zone 5, which can monitor the leakage of individual equipment in real time and respond quickly when an anomaly is detected, ensuring safety and reliability under complex operating conditions.

[0051] A ventilation duct 6 is also connected to the second end face 11, and at least one layer of filter screen 7 is provided between the second end face 11 and the ventilation duct 6.

[0052] In addition, a negative pressure exhaust system 4 is installed at the right exit of the main cabin 1 and on the right side (tail) of the ventilation duct. This negative pressure exhaust system 4 generates a strong suction force to rapidly guide the airflow along the inner convex wall, along with the nanoparticles and harmful gases therein, into the filter screen 7 / device for treatment.

[0053] To enable real-time monitoring of powders and harmful gases within the main compartment 1, a broad-spectrum analyzer 90 is installed inside the main compartment 1. The analyzer 90 can be installed either near the second end face or at a location that can be adjusted according to actual conditions.

[0054] The wide-spectrum analyzer 90 is located at the bottom of the horizontal plane of the main body 1, and near the second end face of the body.

[0055] The analyzer installed here can directly monitor the powder concentration, helping to determine the suspension state and uniformity of the powder distribution in the soft air zone 5. Simultaneously, in the event of a powder leak, the analyzer can promptly provide data feedback, allowing operators to quickly adjust the wind speed of the blower 2 at the first end face or other equipment operating parameters, thereby ensuring efficient equipment operation and environmental safety.

[0056] This embodiment features an inwardly convex curved surface flow guide structure. Its top and side walls are continuous inwardly convex surfaces with rounded transitions, while the bottom is a flat horizontal plane without any curvature. This is the internal fluid domain of this embodiment. Figure 5 , Figure 6 As shown, the left side of the main cabin 1 is designated as the airflow inlet, and the right side is designated as the negative pressure exhaust outlet. The airflow is blown parallel from left to right, forming a directional airflow field in a closed environment. The internal flow path of the main cabin 1 is horizontal, and the top and side walls have an inwardly convex curved surface structure to guide the airflow to flow stably along the upper inner wall of the main cabin 1.

[0057] Figure 9 The diagram shown is a simulation result (yz plane) of the airflow of the safety cabin structure of this utility model without any internal equipment. To verify the airflow organization capability of this structure under undisturbed conditions, Fluent simulation analysis was performed on the main cabin 1, and the airflow distribution and streamline structure were observed under the same inlet and outlet boundary conditions.

[0058] As can be observed from the figure: After the main cabin 1 adopts the design of continuous inward convex curved surfaces on the top and side walls, the airflow forms a uniform and stable wall-hugging flow path along the wall and advances in an orderly manner from left to right; the central area naturally forms a relatively calm and stable soft wind zone 5 (marked by the red line), with a wind speed of less than 1.5 m / s, and has obvious pressure difference buffer zone and low disturbance characteristics.

[0059] To further verify the advantages of this utility model structure in airflow control, Fluent was used to conduct numerical simulation and vector comparison analysis of the airflow distribution inside the safety cabin with two different structures. The curved structure forms a streamlined laminar flow field with good wall adhesion along the inner curved surface throughout the main cabin 1. After the airflow enters from the air supply end, it can stably slide along the top and side walls to the negative pressure exhaust port. The wind speed in the central area is gentle and the disturbance is minimal, forming a stable "soft wind zone 5".

[0060] The internally convex nano-safety chamber of this invention enables stable airflow along the inner wall, forming a soft wind zone 5 in the center, thereby effectively reducing turbulence and protecting equipment in the central area from interference. Furthermore, each safety chamber is equipped with a broad-spectrum analyzer 90, capable of real-time monitoring of leaks in individual devices and responding rapidly when an anomaly is detected, thus improving the efficiency and reliability of nanomaterial production.

[0061] This utility model also discloses a closed dust removal device, including the above-mentioned inner convex curved surface isolation chamber and several support columns 8. The support columns 8 are arranged sequentially along the inner convex curved surface isolation chamber and support the inner convex curved surface isolation chamber upward.

[0062] The convex curved isolation chamber also contains a broad spectrum analyzer 90, which is installed in the soft wind zone.

[0063] like Figure 4 As shown, the front end of the air supply channel of the negative pressure ventilation system is connected to the main body 1 through multiple nested interfaces 12.

[0064] Establish a three-dimensional rectangular coordinate system, with the x-axis pointing from the first end face to the second end face along the length of the main hull, the y-axis along the horizontal direction, and the z-axis along the vertical direction, with the top of the axis being positive.

[0065] The bottom of the main cabin is a horizontal plane with z=z0 (z0>-a). The main cabin wall is a continuous inward convex surface. The surface of the negative pressure exhaust system adopts the cut-off part of the single-leaf hyperboloid family, and its mathematical expression is as follows.

[0066] ;

[0067] Where a, b, and c are adjustable design parameters that control the changes in the minimum lateral half-axis, the minimum vertical half-axis, and the axial ratio, respectively.

[0068] For any fixed X=X c The intersection of the plane and the hyperboloid is an ellipse.

[0069] At any fixed plane x = X, the intersection with the hyperboloid is an ellipse, whose horizontal semi-axis A(X) and vertical semi-axis B(X) can be expressed as:

[0070] have to:

[0071] , ;

[0072] Therefore, the horizontal half-axis A(x) and the vertical half-axis B(x) increase monotonically with |x|;

[0073] Where 'a' (minimum transverse half-axis) controls the minimum half-width of the central section; increasing 'a' will widen the transverse dimension as a whole and increase the radius of curvature of the crown.

[0074] Where b (minimum vertical half-axis): controls the minimum height of the central section; increasing b can raise the top surface as a whole, making it easier to reach a high position on the first end face;

[0075] Where c (axial extension parameter, unit m): controls the rate at which it "grows" from the center to both ends; the smaller c is, the faster A(x) and B(x) grow with |x|, and the more obvious the contraction / expansion; the larger c is, the more gradual the change.

[0076] Where x1 and x2 determine the points on the hyperboloid surface at both ends, thereby determining the actual dimensions of the cross-sections at both ends.

[0077] The first end face is located at x=x1<0 (on the outer side, with a larger cross-section);

[0078] The second end face is located at x = x2 < 0, and |x1| > |x2| (closer to the center, smaller cross-section). The axial length L of the main body is given by L = x2 - x1 > 0 (e.g., L = 4.5m).

[0079] The range of surface parameters for the main cabin is a∈[2.0, 4.0], b∈[3.5, 6.0], c∈[8.0, 12.0], and the axial length of the main cabin L=x2-x1 is taken as 4.0-6.0m.

[0080] Under the combined action of the negative pressure ventilation system supply system, the negative pressure ventilation system and the convex curved surface inside the negative pressure ventilation system, a soft air zone is formed in the main body of the negative pressure ventilation system, which can accommodate the operating equipment.

[0081] The air outlet of the negative pressure exhaust system on the first end face is arranged in an annular arc and nested with the main body. The opening shape of the air outlet of the negative pressure exhaust system in the first end face view is an elliptical trapezoid or its equivalent shape, with a circumferential coverage angle of 220 degrees to 260 degrees and an opening width preferably of 50 to 200 mm. The air from the fan is guided by the air supply channel of the negative pressure exhaust system and sprayed tangentially close to the inner wall to be evenly introduced into the main body and flow along the inner wall of the convex curved surface of the main body of the negative pressure exhaust system.

[0082] The negative pressure ventilation system includes, in sequence, the following components on the right side of the second end face (away from the first end face): a contraction ventilation duct connected to the second end face, the shape of which is an elliptical contraction section or its equivalent shape, with an axial contraction ratio preferably of 1.2-2.5; a filter screen arranged inside the ventilation duct along the airflow direction; and a negative pressure device located at the tail end of the ventilation duct.

[0083] like Figure 2 As shown, the convex curved isolation chamber has a door 100 installed at the first end face 10, and the door 100 is provided with an observation window 101.

[0084] The above are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all general technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Therefore, those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure 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.

Claims

1. A concave curved surface isolation chamber, characterized in that, include: The main body (1) is arranged in a horizontal direction. The main body (1) has an open first end face (10) and a second end face (11). The top surface and side wall inside the main body (1) are continuous convex curved surfaces, forming an airflow channel extending from the first end face (10) to the second end face (11). An air supply system is provided at the first end face (10). The air supply system includes a number of fans (2) surrounding the first end face (10) and an annular flow guide structure (3) connected to the inner wall of the main body (1). A negative pressure exhaust system (4) is installed at the second end face (11); Under the action of the air supply system and the negative pressure exhaust system (4), a soft air zone (5) is formed in the airflow channel to accommodate the operating device (91).

2. The convex curved surface isolation chamber as described in claim 1, characterized in that: The second end face (11) is also connected to a ventilation duct (6), and at least one layer of filter screen (7) is provided between the negative pressure exhaust system (4) and the ventilation duct (6).

3. A concave curved surface isolation chamber as described in claim 1 or 2, characterized in that: The opening gradually narrows radially from the first end face (10) to the second end face (11).

4. The convex curved surface isolation chamber as described in claim 1, characterized in that: The number of the fans (2) is 6 to 12.

5. A concave curved surface isolation chamber as described in claim 1, 2, or 4, characterized in that: The convex inner surface adopts a circular arc transition form.

6. A closed-loop dust removal device, characterized in that: It includes an inner convex curved surface isolation chamber as described in any one of claims 1 to 5 and a plurality of support columns (8), wherein the support columns (8) are arranged sequentially along the inner convex curved surface isolation chamber and support the inner convex curved surface isolation chamber upward.

7. A closed-loop dust removal device as described in claim 6, characterized in that: The convex curved isolation chamber also contains a broad spectrum analyzer (90), which is installed in the soft wind zone (5).

8. A closed-loop dust removal device as described in claim 6 or 7, characterized in that: The inner convex curved isolation chamber is equipped with a door (100) at the first end face (10), and the door (100) is provided with an observation window (101).

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