Fluidized bed and gas-sand suspension bed

Abstract

The present application relates to a kind of fluidization cabin and gas sand suspension bed.The fluidization cabin, including cabin, porous plate and multiple support parts, there is accommodating cavity with opening upward in cabin, bottom wall of accommodating cavity is downwardly and throughly provided with air inlet, support part and porous plate are all located in accommodating cavity, wherein, each support part is spaced distribution and is fixed to the bottom wall of accommodating cavity, porous plate is fixed on the top of support part and is attached to the inner wall of accommodating cavity, to separate accommodating cavity into guiding cavity located in lower side and fluidization cavity located in upper side along vertical direction, the cross-sectional area of each support part gradually decreases along vertical direction to the side close to porous plate, and outer circumferential surface is smooth curved surface;The smooth curved surface outer circumferential surface of support part can guide airflow to be inclined to flow, avoids stagnation and vortex to be generated by vertical impact porous plate bottom surface, while the cross-sectional shape of lower width and upper narrow forms expansion type airflow channel, so that airflow is decelerated and expanded in the process of rising, to realize the buffering and uniform distribution of airflow.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a fluidized bed and an air-sand suspension bed. Background Technology

[0002] Air-sand suspension beds are medical devices that utilize solid fluidization technology. Through aerodynamics, solid microparticles within the bed undergo fluid-like motion, providing a low-pressure, low-shear, dry, and warm support environment for pressure ulcer prevention, postoperative rehabilitation, and burn patients. This has significant clinical value for wound healing.

[0003] Existing fluidized bed fluidized beds mostly use perforated plates fixed inside the fluidized bed as support and diversion elements. Compressed air enters through the air inlet at the bottom of the chamber, and is then throttled and diverted through the densely packed small holes on the perforated plate before entering the fluidization zone to achieve particle fluidization.

[0004] However, in this traditional structure, since the perforated plate is usually placed directly above the air inlet, the high-speed airflow forms a jet that directly impacts the bottom of the plate. This easily generates vortices and uneven pressure distribution below the perforated plate, causing the uniformity of airflow distribution to be greatly affected by the position of the air inlet when passing through the perforated plate, making it difficult to achieve ideal full-section uniform fluidization. At the same time, the airflow generates significant flow resistance when impacting the perforated plate at high speed and passing through numerous throttling orifices, resulting in significant energy loss and increasing the energy consumption of the fan. Summary of the Invention

[0005] Therefore, it is necessary to address the problems of low airflow uniformity and large airflow energy loss in the fluidized chambers of current air-sand suspension beds, and to provide a fluidized chamber and air-sand suspension bed that can effectively improve airflow uniformity and reduce fan energy consumption.

[0006] This application first provides a fluidization chamber, including a chamber body, a perforated plate, and multiple support parts. The chamber body has an upward-opening accommodating cavity, and an air inlet is provided through the bottom wall of the accommodating cavity. The support parts and the perforated plate are both located within the accommodating cavity. The support parts are spaced apart and fixed to the bottom wall of the accommodating cavity. The perforated plate is fixed to the top of the support parts and fits against the inner wall of the accommodating cavity, so as to divide the accommodating cavity vertically into a guide cavity located on the lower side and a fluidization cavity located on the upper side. The cross-sectional area of ​​each support part gradually decreases along the vertical direction towards the side closer to the perforated plate, and the outer peripheral surface is a smooth curved surface.

[0007] In one embodiment, the support portion is frustum-shaped, and the top surface of the support portion is flat and fits against the bottom surface of the perforated plate.

[0008] In one embodiment, each of the support portions is disposed at equal intervals along the horizontal direction within the receiving cavity.

[0009] In one embodiment, the vertical projection of the air inlet is located at the center of each of the supports.

[0010] In one embodiment, a bolt hole is provided at the center of the top surface of the support part, and a through hole is provided in the perforated plate that corresponds to each of the bolt holes. The perforated plate and the support part are fixed by bolts that pass through the through holes and are threaded to the bolt holes.

[0011] In one embodiment, the inner wall of the accommodating cavity has a stepped surface, the top surface of which is flush with the top of the support portion to jointly support the perforated plate.

[0012] In one embodiment, the stepped surface is arranged horizontally around the inner wall of the receiving cavity.

[0013] In one embodiment, the flow guiding cavity is formed by the outer peripheral surface of the support and the inner wall of the accommodating cavity, and the cross-sectional area of ​​the flow guiding cavity gradually increases upward in the vertical direction to form a gradually expanding flow guiding channel.

[0014] In one embodiment, the support is integrally formed with the cabin body.

[0015] This application also provides an air-sand suspension bed, including the fluidization chamber described above.

[0016] The fluidization chamber described above improves the uniformity of airflow distribution and reduces energy loss through the special structural design of the support section. The smooth curved outer circumference of the support section can guide the high-speed jet from the air inlet into an oblique flow, avoiding the stagnation and vortices caused by vertical impact on the bottom surface of the perforated plate. At the same time, its cross-sectional shape, which is wider at the bottom and narrower at the top, forms an expansion airflow channel, which slows down and diffuses the airflow during its ascent. This achieves buffering, mixing and uniform distribution of the airflow in the guide cavity, eliminating the uneven pressure distribution and vortex zone caused by direct jet impact in traditional structures, thereby reducing the energy consumption of the fan and improving the stability of the airflow. Attached Figure Description

[0017] Figure 1 This is a perspective view of one embodiment of the air-sand suspension bed of this application; Figure 2 for Figure 1 A three-dimensional schematic diagram of the mid-section; Figure 3 for Figure 2 Cross-sectional view of the central air intake location; Figure 4 for Figure 1 A cross-sectional view of the location of the central sealing strip; Figure 5 for Figure 1 Cross-sectional schematic diagram of medium and micro particles; Figure 6 for Figure 1 A schematic diagram of the gas path in the middle.

[0018] Reference numerals: 100, fluidization chamber; 110, chamber body; 111, accommodating cavity; 111a, guide cavity; 111b, fluidization chamber; 112, air inlet; 113, stepped surface; 114, sealing groove; 120, perforated plate; 130, support part; 140, sealing strip; 141, embedding part; 142, pressure strip part; 143, limiting part; 150, microparticles; 151, inner liner; 152, anaerobic layer; 200, power component; 210, fan; 220, heater; 230, fan box; 240, air filter; 250, sterilizer; 300, control component; 310, control box; 320, display screen; 410, first pipeline; 420, second pipeline. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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, they should not be construed as limitations on this invention.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0025] Please combine Figure 1 , Figure 2 as well as Figure 3 As shown, this application first provides a fluidization chamber, including a chamber body 110, a perforated plate 120, and a plurality of support parts 130. The chamber body 110 has an upward-opening accommodating cavity 111. An air inlet 112 is provided through the bottom wall of the accommodating cavity 111. The support parts 130 and the perforated plate 120 are both located in the accommodating cavity 111. The support parts 130 are spaced apart and fixed to the bottom wall of the accommodating cavity 111. The perforated plate 120 is fixed to the top of the support parts 130 and fits against the inner wall of the accommodating cavity 111, so as to divide the accommodating cavity 111 vertically into a guide cavity 111a located on the lower side and a fluidization cavity 111b located on the upper side. The cross-sectional area of ​​each support part 130 gradually decreases along the vertical direction towards the side closer to the perforated plate 120, and the outer peripheral surface is a smooth curved surface.

[0026] In this application, the special structural design of the support part 130 improves the uniformity of airflow distribution and reduces energy loss. The smooth curved outer peripheral surface of the support part 130 can guide the high-speed jet from the air inlet 112 into an oblique flow, avoiding the stagnation and vortex generated by the vertical impact on the bottom surface of the perforated plate 120. At the same time, its cross-sectional shape, which is wider at the bottom and narrower at the top, forms an expansion airflow channel, which slows down and expands the airflow during its ascent. This achieves buffering, mixing and uniform distribution of airflow in the guide cavity 111a, eliminating the uneven pressure distribution and vortex zone caused by the direct impact of the jet in the traditional structure, thereby reducing the energy consumption of the fan and improving the stability of the airflow.

[0027] Specifically, by designing the outer peripheral surface of the support 130 as a smooth curved surface (including but not limited to an arc transition surface or a streamlined curved surface), its outer peripheral surface serves as a guide surface to guide the high-speed airflow from the air inlet 112. When the airflow flows along the curved surface, its direction is guided and diffused to the horizontal and oblique directions, avoiding the local high pressure caused by the airflow directly hitting the center area of ​​the perforated plate 120 in the traditional structure, thereby achieving the initial uniform distribution of airflow and creating conditions for uniform air intake at all positions of the perforated plate 120, thus optimizing the uniform airflow distribution effect. The cross-sectional area of ​​the support 130 gradually decreases towards the perforated plate 120 in the vertical direction (i.e., wider at the bottom and narrower at the top), making the airflow channel between adjacent support 130 a diffused cross-section that is narrower at the bottom and wider at the top. According to Bernoulli's principle, the flow cross-sectional area gradually increases as the airflow rises, and the flow velocity decreases accordingly. The dynamic pressure is converted into static pressure, which helps to eliminate pressure pulsation and velocity gradient of the airflow, making the pressure distribution of the airflow tend to be uniform before it reaches the perforated plate 120, and further optimizing the uniformity of airflow distribution. In addition, the structure of the support part 130, which is wider at the bottom and narrower at the top, allows its smooth curved surface to guide the airflow at an inclined angle (rather than vertical 90°) to the bottom surface of the perforated plate 120. This avoids the stagnation and vortex separation caused by the high-speed jet impacting the bottom of the plate. This non-vertical incident significantly reduces the impact loss and local drag coefficient during the flow process, reduces energy dissipation, and thus reduces the fan power required to maintain fluidization.

[0028] It is worth mentioning that the multiple support portions 130 in this application are distributed at intervals, providing multi-point support for the perforated plate 120. This effectively disperses the weight of the perforated plate 120 itself, the weight of microparticles, and the impact force of airflow, so that the perforated plate 120 does not need to rely on its own high rigidity to resist deformation, thereby reducing the requirements for plate thickness and material strength. Therefore, the perforated plate 120 in this application can be designed with a higher open area ratio (porosity), further reducing the throttling resistance of airflow through the perforated plate 120 and achieving energy saving and consumption reduction.

[0029] Please combine Figure 2 as well as Figure 3As shown, in some embodiments, the support portion 130 is frustum-shaped, and the top surface of the support portion 130 is flat and fits against the bottom surface of the perforated plate 120.

[0030] By designing the support 130 as a frustum shape, with its top surface being flat and fitting against the bottom surface of the perforated plate 120, the stability of the support structure and the axisymmetry of the airflow can be improved.

[0031] Specifically, the frustum-shaped structure achieves a continuous and smooth transition from the bottom to the top surface of the outer periphery of the support 130, ensuring that the airflow from the air inlet 112 can diffuse evenly in all directions along the conical surface at 360°, avoiding airflow deflection that may be caused by the asymmetrical structure. At the same time, the planar top surface forms a surface contact with the bottom surface of the perforated plate 120, increasing the contact area and effectively dispersing the aerodynamic impact force and particle load borne by the perforated plate 120, reducing local stress concentration, and preventing local deformation or fatigue damage of the perforated plate 120 at the support point. This ensures the long-term flatness of the perforated plate 120 and avoids uneven airflow distribution caused by plate warping, thereby achieving the effect of maintaining uniform airflow distribution.

[0032] Please combine Figure 2 as well as Figure 3 As shown, in some embodiments, each support portion 130 is disposed at equal intervals in the receiving cavity 111 along the horizontal direction.

[0033] By arranging the support parts 130 at equal intervals in the horizontal direction within the accommodating cavity 111, a high degree of uniformity in the flow field distribution within the guiding cavity 111a and a balance in the support force of the perforated plate 120 are achieved.

[0034] The equidistant arrangement ensures that the flow channels formed between adjacent support sections 130 have the same flow cross-section and flow resistance. This ensures that the airflow entering from the inlet 112 can form a uniformly pressure-distributed airflow field below the perforated plate 120 after passing through each support section 130, avoiding local high-speed zones or low-speed dead zones caused by uneven arrangement of support sections 130. At the same time, the multi-point equidistant support ensures a uniform deflection distribution of the perforated plate 120, preventing local sinking or bulging of the plate surface, maintaining uniform contact between the perforated plate 120 and the particle layer in the fluidization cavity 111b, and ensuring the stability of fluidization quality.

[0035] Preferably, three sets of support parts 130 are equally spaced along the length direction of the fluidization chamber 100 inside the accommodating cavity 111, and each set of support parts 130 includes three support parts 130 equally spaced along the width direction of the fluidization chamber 100.

[0036] Of course, in other embodiments, the layout and number of support parts 130 can be adapted to the size of fluidization chamber 100 and actual needs, as long as the airflow distribution and support requirements can be met.

[0037] In some embodiments, the projection of the air inlet 112 along the vertical direction is located at the center of a ring of support portions 130 around it, and the projection of the air inlet 112 does not overlap with each support portion 130, thereby achieving centrally symmetrical air intake and uniform distribution of airflow, reducing air intake resistance and optimizing the airflow distribution balance in the guide cavity 111a.

[0038] Specifically, since the projection of the air inlet 112 does not overlap with each support portion 130, that is, the air inlet 112 is located below the gap between adjacent support portions 130, the high-speed airflow entering the accommodating cavity 111 from the air inlet 112 can directly enter the guide cavity 111a upwards, avoiding flow blockage, flow loss and vortex generation caused by the airflow directly impacting the bottom surface of the support portion 130; at the same time, the air inlet 112 is located at the center of each support portion 130 (that is, the central area of ​​the support portion 130 array), so that after the airflow enters, it can be symmetrically distributed in the circumferential direction to the diffusion-type airflow channels between the surrounding support portions 130, ensuring that the airflow in all directions is uniform and consistent, eliminating flow deviation and flow dead zones; Furthermore, this arrangement can form a synergistic flow guiding effect with the smooth curved outer peripheral surface of the support 130: the central airflow directly upward from the air inlet 112 is uniformly diverted and guided into oblique flow by the smooth curved outer peripheral surface of the surrounding support 130 during its ascent. Since the air inlet 112 is located in the center, the airflow can diffuse evenly in all directions in 360 degrees. It is uniformly decelerated and diffused in the diffusion-type channels of each support 130, which are wider at the bottom and narrower at the top, and the dynamic pressure is converted into static pressure. This forms a centrally symmetrical uniform flow field in the flow guiding cavity 111a, avoiding the generation of local high-pressure areas and vortex separation, reducing flow resistance and energy dissipation, further reducing the fan energy consumption required to maintain stable fluidization, while ensuring uniform air intake across the entire cross section of the perforated plate 120, and improving the uniformity and stability of solid particle fluidization in the fluidization cavity 111b.

[0039] Please combine Figure 2 as well as Figure 3 As shown, in some embodiments, the inner wall of the accommodating cavity 111 has a stepped surface 113, the top surface of which is flush with the top of the support portion 130 to jointly support the perforated plate 120.

[0040] By setting a stepped surface 113 on the inner wall of the accommodating cavity 111, and making the top surface of the stepped surface 113 flush with the top of the support part 130 to jointly support the perforated plate 120, a support system combining multi-point support and edge constraint of the perforated plate 120 is realized. This effectively disperses the force on the perforated plate 120 and prevents edge warping deformation, thereby improving the structural stability of the perforated plate 120 under complex loads.

[0041] Specifically, the stepped surface 113 provides continuous edge support for the perforated plate 120 along the inner wall of the accommodating cavity 111, complementing the spaced support portions 130. The support portions 130 mainly bear the gravity and airflow impact force in the central region of the perforated plate 120, while the stepped surface 113 constrains the edge displacement of the perforated plate 120, preventing edge warping or sealing failure under the action of air pressure difference. The design that the top surface of the stepped surface 113 is flush with the top of the support portion 130 ensures that the perforated plate 120 remains horizontal after installation, avoiding plate tilting and local stress concentration caused by inconsistent support heights, ensuring the fit and sealing between the perforated plate 120 and the inner wall of the accommodating cavity 111, and preventing airflow from directly entering the fluidization cavity 111b through edge short-circuiting. Meanwhile, this composite support structure allows the load of the perforated plate 120 to be borne jointly by the central support part 130 and the edge step surface 113, which significantly reduces the maximum bending stress of the perforated plate 120. This allows for the use of a thinner perforated plate 120 under the same strength requirements, thereby further increasing the proportion of the opening area and reducing the throttling resistance.

[0042] Please combine Figure 2 as well as Figure 3 As shown, in some embodiments, the stepped surface 113 is arranged around the inner wall of the accommodating cavity 111 in the horizontal direction, realizing continuous support for the edge of the perforated plate 120 around the entire circumference, forming a complete annular sealing boundary, effectively preventing short circuit of edge airflow and improving the sealing reliability of the perforated plate 120.

[0043] Specifically, the surrounding stepped surface 113 provides 360-degree continuous circumferential support for the circular, rectangular or other shaped perforated plate 120, forming a sealing fit with the edge of the perforated plate 120 through surface contact or line contact, eliminating gaps and leakage channels that may exist in discontinuous support. Furthermore, this full-circumference support structure ensures that the inner wall of the accommodating cavity 111 provides uniform constraint on the edge of the perforated plate 120. When the air pressure in the flow guiding cavity 111a increases, the edge of the perforated plate 120 is subjected to a uniform upward air pressure force, which can provide a balanced reverse support force around the step surface 113, preventing the perforated plate 120 from deforming or warping in any direction, and ensuring airtight isolation between the flow guiding cavity 111a and the fluidization cavity 111b. Meanwhile, the continuous annular stepped surface 113 simplifies the installation and positioning of the perforated plate 120. The perforated plate 120 can be automatically centered and horizontally positioned simply by placing it on the stepped surface 113, without the need for additional edge fasteners. This improves assembly efficiency and ensures a high-precision fit between the perforated plate 120 and the top of the support 130, enabling the perforated plate 120 to achieve optimal performance in terms of both airflow distribution and structural load-bearing capacity.

[0044] Please combine Figure 2 as well as Figure 3 As shown, in some embodiments, the flow guiding cavity 111a is formed by the outer peripheral surface of the support portion 130 and the inner wall of the accommodating cavity 111. The cross-sectional area of ​​the flow guiding cavity 111a gradually increases upward in the vertical direction to form a gradually expanding flow guiding channel, which improves the diffusion and uniform distribution effect of the airflow and further reduces the flow resistance and energy loss.

[0045] Specifically, as the cross-sectional area of ​​the guide cavity 111a gradually increases vertically upwards, a bottom-to-top gradually expanding guide channel is formed. According to the continuity equation and Bernoulli's principle, the high-speed airflow from the inlet 112 continuously increases in cross-sectional area during its ascent, gradually reducing the airflow velocity and effectively converting dynamic pressure into static pressure, thus achieving the deceleration and diffusion process of the airflow. This gradually expanding structure effectively suppresses the development of turbulent pulsations and velocity gradients, making the pressure distribution of the airflow more uniform before reaching the perforated plate 120, avoiding flow separation and vortex generation caused by excessively high flow velocity or abrupt changes in flow direction in traditional straight or converging channels. Meanwhile, the gradually expanding flow channel is coupled with the cross-sectional shape of the support part 130, which is wider at the bottom and narrower at the top, forming a continuous and smooth expansion channel between adjacent support parts 130. This guides the airflow to flow towards the bottom areas of the perforated plate 120 in a gentler trajectory, further eliminating the influence of the air inlet 112 position on the airflow distribution. This ensures that the entire cross-section of the perforated plate 120 receives a uniform and stable airflow supply, thereby reducing the fan power requirement while improving the fluidization uniformity of solid particles in the fluidization chamber 111b.

[0046] Please combine Figure 1 as well as Figure 2 As shown, in some embodiments, the support portion 130 has a bolt hole at the center of its top surface, and the perforated plate 120 has through holes corresponding to each bolt hole. The perforated plate 120 and the support portion 130 are fixed together by bolts that pass through the through holes and are threaded to the bolt holes.

[0047] By connecting the bolt through-hole and the bolt hole with a threaded connection, a detachable rigid fixed connection is achieved between the perforated plate 120 and the support part 130, ensuring the structural stability of the perforated plate 120 under airflow impact and particle load, while simplifying the assembly process and facilitating later maintenance.

[0048] Specifically, bolt connection, as a standardized mechanical fastening method, can provide sufficient preload to ensure that the bottom surface of the perforated plate 120 and the top surface of the support 130 are tightly fitted together, effectively preventing the perforated plate 120 from undergoing relative displacement or vibration under the action of high-pressure airflow and fluidized particle dynamic load, and ensuring reliable airtight separation between the flow guiding cavity 111a and the fluidizing cavity 111b. Meanwhile, the bolt holes are set at the center of the top surface of the support part 130, so that the bolt axis coincides with the central axis of the support part 130. The bolt preload can be evenly transmitted along the axial direction of the support part 130, avoiding the additional bending moment caused by the eccentric connection. This allows the support part 130 to mainly bear the axial pressure, giving full play to the load-bearing advantages of its wide bottom and narrow top structure. In addition, the detachable connection method facilitates the installation, disassembly and replacement of the perforated plate 120. When cleaning, maintenance or replacement of the perforated plate 120 with different porosities to meet the needs of different patients is required, the operation can be completed simply by loosening the bolts, which significantly improves the maintenance convenience and usage flexibility of the equipment.

[0049] Please combine Figure 2 as well as Figure 3 As shown, in some other embodiments, the support 130 is integrally formed with the cabin 110. By designing the support 130 and the cabin 110 as an integrally formed structure, the structural integrity, airtight reliability, and airflow guidance continuity of the fluidization chamber are improved.

[0050] Specifically, the one-piece molding structure eliminates the assembly gap or mechanical connection interface between the support part 130 and the bottom wall of the accommodating cavity 111, avoiding the risk of loosening of the connection, failure of the seal or fatigue cracking caused by airflow vibration, alternating particle load or thermal cycle stress during long-term use, ensuring that the support part 130 can continuously and stably provide reliable multi-point support for the perforated plate 120, and improving the structural strength and long-term operational safety of the equipment. Meanwhile, since the outer peripheral surface of the support part 130 is a smooth curved surface, the integral molding ensures the smooth transition and geometric continuity between the smooth curved surface and the bottom wall of the accommodating cavity 111, avoiding assembly steps, misalignment gaps or surface discontinuities that may occur during separate assembly, ensuring that the high-speed airflow from the air inlet 112 can smoothly change from vertical to oblique flow along the continuous smooth guide surface, preventing boundary layer separation, local disturbance or vortex generation of airflow at the connection, and further improving the uniformity of airflow distribution; In addition, the one-piece molded structure completely eliminates potential leakage channels between the support part 130 and the bottom wall of the cabin 110, preventing compressed air from short-circuiting and leaking from these undesigned paths. It ensures that all airflow is buffered, mixed and evenly distributed through the diffused flow channel formed between adjacent support parts 130, which is narrow at the bottom and wide at the top. This improves the airflow control accuracy and the energy utilization efficiency of the fan, and further reduces energy consumption. In terms of manufacturing and maintenance, the one-piece molding reduces the number of parts, assembly processes and tolerance requirements, lowers production costs and reduces the accumulation of assembly errors. At the same time, it eliminates the risk of microparticle accumulation or microbial growth in gaps, making it easier to thoroughly clean and disinfect in medical environments, and better meets the hygiene and safety requirements of air-sand suspension beds as medical devices.

[0051] Furthermore, please combine Figure 4 as well as Figure 5 As shown, in some embodiments, the fluidization chamber 100 further includes a sealing strip 140 and microparticles 150. A sealing groove 114 is provided around the accommodating cavity 111 on the top of the chamber 110. The sealing groove 114 is configured to cooperate with the sealing strip 140 to press the edge of the sheet laid on the top of the chamber 110 to seal the fluidization cavity 111b. Microparticles 150 are filled in the fluidization cavity 111b.

[0052] Please refer to the following: Figure 4 As shown, the sealing strip 140 includes an embedding part 141 and a pressure strip part 142 fixed to the top of the embedding part 141. When the pressure strip part 142 clamps the bed sheet with the top of the cabin 110 in the vertical direction, the embedding part 141 inserts part of the bed sheet into the sealing groove 114.

[0053] Through the synergistic action of the embedded part 141 and the pressure strip part 142 of the sealing strip 140, a mechanical labyrinth seal is achieved at the edge of the sheet, effectively preventing the microparticles 150 in the fluidization chamber 111b from leaking out from the gap between the sheet and the top of the chamber 110, while facilitating the quick fixing and replacement of the sheet.

[0054] Specifically, when the pressure strip 142 clamps the sheet vertically with the top of the compartment 110, the insert 141 forces the sheet material into the sealing groove 114 to form a deep-insertion sealing structure; the outer wall of the insert 141 fits tightly with the side wall of the sealing groove 114, and the flexible fabric of the sheet fills the microscopic gap between them to form multiple physical sealing barriers; the pressure strip 142 provides continuous vertical downward pressure to ensure that the insert 141 always remains at the bottom position of the sealing groove 114, maintaining a stable sealing state.

[0055] Compared to simple planar compression, this plug-in sealing method has a longer leakage path, which can effectively prevent the escape of microparticles 150 under the action of high-pressure airflow. At the same time, the mechanical clamping of the bed sheet by the embedded part 141 restricts the lateral movement of the bed sheet, preventing the seal from failing due to patient movement or airflow disturbance.

[0056] Please combine Figure 3 as well as Figure 4 As shown, in some embodiments, the bottom surface of the pressure strip 142 is also fixed with limiting parts 143 located on the inner and outer sides of the embedding part 141 respectively. When the pressure strip 142 clamps the bed sheet with the top of the cabin 110 in the vertical direction, the two limiting parts 143 abut against the top of the outer wall of the cabin 110 and the top of the inner wall of the accommodating cavity 111 respectively.

[0057] By providing limiting parts 143 on the bottom surface of the pressure strip 142, located on the inner and outer sides of the embedded part 141 respectively, the positioning accuracy and structural stability of the sealing strip 140 are enhanced, preventing the sealing strip 140 from sliding laterally or tilting when under pressure, ensuring uniform distribution of sealing force, and protecting the top edge of the cabin 110 from local compression damage.

[0058] Specifically, when the pressure strip 142 presses the bed sheet down, the inner limiting part 143 abuts against the top of the inner wall of the receiving cavity 111, and the outer limiting part 143 abuts against the top of the outer wall of the cabin 110, forming a double-sided limiting structure; this double-sided physical blocking ensures that the embedded part 141 is always aligned with the center position of the sealing groove 114, avoiding the embedded part 141 from sliding out of the sealing groove 114 due to installation errors or external forces; At the same time, the contact between the two limiting parts 143 and the top of the cabin 110 bears part of the vertical pressure, reducing the risk of the top edge of the cabin 110 cracking or deforming due to excessive concentrated stress. In addition, the tight fit between the limiting part 143 and the outer and inner walls of the cabin 110 forms an auxiliary sealing surface, which works in conjunction with the main sealing structure of the embedded part 141 to further improve the sealing reliability of the fluidization cavity 111b and prevent microparticles 150 from leaking from the inner and outer edges of the sealing groove 114.

[0059] Please refer to Figure 5 As shown, the surface of the microparticles 150 has a hydrophobic layer 152.

[0060] By setting a hydrophobic layer 152 on the surface of microparticles 150, the hydrophobic effect of the hydrophobic layer 152 can prevent water from penetrating into the interior of microparticles 150. This allows only viscous substances such as proteins and lipids in body fluids to adhere to the microparticles 150 without absorbing water and causing weight gain. This fundamentally avoids the weight gain, clumping, and fluidization failure caused by moisture absorption, thereby improving the stability of equipment operation. At the same time, it eliminates the preheating and drying process before equipment start-up, realizes the immediate availability of the equipment, saves energy, and shortens emergency preparation time.

[0061] Specifically, during operation, the fluidization chamber of this application has microparticles 150 located in the fluidization cavity 111b between the sheet and the perforated plate 120. After the external power component draws air into the flow chamber 111a through the air inlet 112, the high-pressure airflow is diverted through the holes of the perforated plate 120 and enters the fluidization cavity 111b, thereby causing the microparticles 150 in the fluidization cavity 111b to form a suspended particle layer, providing support for the sheet on top and the patient. The sealing strip 140 and the sealing groove 114 cooperate to seal the fluidization cavity 111b, preventing the microparticles 150 from leaking out through the gap between the sheet and the chamber body 110.

[0062] In addition, the microparticles 150 with the hydrophobic layer 152 can actively repel water from the patient's subperfusion fluid during operation to prevent the particles from increasing in weight and clumping. Meanwhile, the viscous solids such as proteins and lipids in the fluid will still adhere to the microparticles 150 due to their own viscosity, so as to achieve the adsorption of pollutants and prevent the fluid from sticking and clogging the porous plate 120. As the fluidization chamber continues to work, the microparticles 150 will become ineffective after adsorbing a sufficient amount of pollutants and fall to the bottom of the fluidization chamber 111b. The support of the particle layer can be restored and the pollutants removed by regularly cleaning the ineffective particles in batches.

[0063] In some embodiments, the particle size of the microparticles 150 ranges from 60 μm to 140 μm, achieving precise matching with the airflow environment of the fluidization chamber 111b of the fluidization chamber 100 and improving the safety of clinical use.

[0064] Specifically, optimizing the lower limit of particle size to 60μm significantly reduces the risk of microparticles 150 penetrating the gaps in the bed sheet fibers at the top of the chamber 110 while maintaining good fluidization performance, effectively avoiding losses and ward environment pollution caused by particle leakage; while narrowing the upper limit of particle size to 140μm improves the uniformity of the particle population, enabling microparticles 150 to form a more uniform and stable fluidization state under the action of airflow entering the fluidization chamber 111b through the porous plate 120, reducing fluidization dead zones and bubble channeling phenomena, thereby improving the stability of patient suspension support.

[0065] In addition, this particle size range ensures that the microparticles 150 have sufficient specific surface area to effectively adsorb viscous substances such as proteins and lipids in the patient's exudate, while ensuring that the particles after adsorbing pollutants can smoothly settle to the bottom of the fluidization chamber 111b for cleaning.

[0066] Preferably, the particle size of the microparticles 150 ranges from 80 μm to 120 μm.

[0067] In some embodiments, the density of the microparticles 150 is 0.8 g / cm³ to 2.5 g / cm³, establishing a precise matching mechanism with the airflow dynamics characteristics of the fluidization chamber 100, and achieving a dynamic balance between continuous fluidization of clean particles and natural deposition of contaminant particles.

[0068] Specifically, during the operation of the equipment, clean microparticles 150 with a density within this range can smoothly suspend under the influence of the critical fluidization velocity of the airflow after entering the guide cavity 111a through the air inlet 112 and being diverted by the perforated plate 120 (0.1-0.5 m / s), forming a stable particle layer to provide uniform support for the patient. When contaminants such as blood and tissue fluid adhere to the surface of the microparticles 150, their apparent density and gravity increase. When this exceeds the airflow lifting force, these particles can overcome the airflow resistance and naturally settle to the bottom of the fluidization cavity 111b, no longer participating in the upper fluidization movement. This achieves automatic stratification of clean particles and contaminated particles, facilitating regular batch cleaning through the bottom cleaning structure and preventing contaminated particles from clogging the perforated plate 120.

[0069] Preferably, the density of the microparticles 150 is 1.2 g / cm³ to 1.8 g / cm³.

[0070] Please refer to Figure 5 As shown, in some embodiments, the microparticles 150 include an inner liner 151 and a hydrophobic layer 152 completely covering the outer surface of the inner liner 151. The material of the inner liner 151 is glass, ceramic, silicone and / or medical polymer material.

[0071] By using microparticles 150 that completely cover the anaerobic layer 152 with an inner liner 151, the microparticles 150 can both repel water and prevent clumping when working in the fluidization chamber 100, and effectively adhere to viscous solids in the body fluid by relying on the surface properties of the inner liner 151 material and the microstructure of the anaerobic layer 152. This achieves an organic combination of mechanical strength and anaerobic function, ensuring the reliability and biosafety of the equipment during long-term operation.

[0072] The inner liner 151 is made of glass, ceramic, silicone and / or medical polymer materials, which provides the microparticles 150 with the necessary mechanical strength, wear resistance and biocompatibility, ensuring that they maintain their structural integrity under long-term airflow scouring and patient weight pressure in the fluidization chamber 111b; the hydrophobic layer 152 that completely covers the outer surface of the inner liner 151 constitutes a reliable hydrophobic barrier, ensuring that water cannot penetrate into the interior of the inner liner 151 and cause the particles to increase in weight, thereby maintaining the lightweight characteristics of the microparticles 150 and ensuring the stability of the fluidization state.

[0073] In some embodiments, the static water contact angle of the hydrophobic layer 152 is greater than 120° to ensure the long-term stability of the microparticles 150 in the humid working environment of the fluidization chamber 100.

[0074] By limiting the static water contact angle of the hydrophobic layer 152 to greater than 120°, the water droplets on the surface of the microparticles 150 exhibit a highly spherical shape, resulting in a significant surface tension effect. Water cannot spread and penetrate into the interior of the particles, and can only adhere briefly in the form of discrete droplets. Meanwhile, this contact angle range still allows blood and tissue fluid containing viscous components such as proteins and lipids to adhere firmly to the surface of microparticles 150 under the action of their own viscosity and surface energy, ensuring the effective capture and carrying of complex body fluids, preventing body fluids from seeping down and clogging the porous plate 120, and realizing the synergistic work of water evaporation and pollutant adsorption.

[0075] It is worth mentioning that the parameter limitation of the anaerobic layer 152 can be matched with the working airflow environment of 30℃~50℃ in the fluidization chamber 100, so that the moisture attached to the surface of the anaerobic layer 152 can evaporate quickly without causing the microparticles 150 to increase in weight or agglomerate, thereby completely avoiding fluidization failure caused by moisture absorption.

[0076] Preferably, the static water contact angle of the anaerobic layer 152 is greater than 130°.

[0077] In some embodiments, the water absorption rate of the hydrophobic layer 152 is less than 1%, wherein the absorption rate refers to the percentage of water content in the material relative to the weight of the dry material after being placed in an environment with a relative humidity of 90% for 24 hours.

[0078] This configuration ensures that the microparticles 150 remain dry even in high humidity environments, eliminating the risk of fluidization failure caused by moisture absorption and weight gain, and guaranteeing the long-term stability and reliability of the equipment.

[0079] Specifically, the water absorption rate is defined as the percentage of water content in the material to the weight of the dried material being less than 1% after being placed in an extremely humid environment with a relative humidity of 90% for 24 hours. This indicates that the hydrophobic layer 152 has extremely strong hydrophobic barrier properties. In actual clinical applications, even in ward environments with continuous exudation of patient body fluids or high air humidity, the microparticles 150 will not absorb water and increase in weight, ensuring that the particle density is always maintained within a suitable range for fluidization, thereby maintaining stable suspension support. At the same time, it ensures that the equipment will not become damp due to environmental humidity during periods of inactivity, achieving true instant activation without the need for preheating and drying.

[0080] Preferably, the water absorption rate of the anaerobic layer 152 is less than 0.5%.

[0081] In some embodiments, the microparticles 150 are spherical or near-spherical in shape to reduce motion resistance, avoid damaging the patient's wound, and facilitate the formation of a uniform bubble flow.

[0082] Please combine Figure 1 as well as Figure 6As shown, this application also provides an air-sand suspension bed, including a power component 200, a control component 300, and the aforementioned fluidization chamber 100. The fluidization chamber 100 is separated from the power component 200 and the control component 300. The power component 200 is connected to the fluidization chamber 100 through a first pipe 410 to allow air to be introduced into the fluidization chamber 100. The control component 300 is connected to the fluidization chamber 100 through a second pipe 420 to detect airflow information within the fluidization chamber 100. The control component 300 is also electrically connected to the power component 200 to adjust the output power of the power component 200. Both the first pipe 410 and the second pipe 420 are made of insulating material.

[0083] By physically separating the fluidization chamber 100 from the power assembly 200 and the control assembly 300, and using the insulated first pipe 410 and second pipe 420 as the power transmission and signal acquisition channels respectively, even if the control assembly 300 leaks current, the current cannot be conducted to the fluidization chamber 100 through the insulated second pipe 420, fundamentally eliminating the risk of electric shock and ensuring the absolute safety of patients with broken skin. At the same time, the closed-loop air circuit formed by the first pipe 410 and the second pipe 420 enables the fluidization chamber 100 to realize the function of airflow parameter detection and adjustment without setting any electrical interface, which meets both the electrical safety requirements of medical equipment and the functional requirements. In addition, since the fluidization chamber 100 does not require any electrical interfaces, it also eliminates the weak points of waterproofing and moisture protection. With the use of insulating materials, the fluidization chamber 100 can achieve a higher level of protection, supports direct washing with water or disinfectant, and greatly reduces the risk of cross-infection. It is especially suitable for environments with high infection control requirements, such as burn wards.

[0084] Specifically, the power component 200 supplies air to the fluidization chamber 100 through the first pipe 410, while the control component 300 collects airflow information within the fluidization chamber 100 through the second pipe 420. Since the control component 300 is electrically connected to the power component 200, it can adjust the output power of the power component 200 according to the collected airflow information to achieve closed-loop control of the airflow output from the air-sand suspension bed, ensuring that the airflow intensity meets real-time requirements. Furthermore, since the second pipe 420 only transmits airflow and not electrical signals, and both the first pipe 410 and the second pipe 420 are made of insulating materials, the electrical conduction path between the control component 300 and the fluidization chamber 100 is cut off, achieving complete electrical isolation.

[0085] Please combine Figure 1 as well as Figure 6As shown, in some embodiments, the power assembly 200 is connected to the cabin 110 via a first pipe 410, and the control assembly 300 is connected to the cabin 110 via a second pipe 420; the cabin 110 is made of insulating material.

[0086] By using an insulating material for the chamber 110, a double electrical isolation barrier is formed with the insulating design of the first conduit 410 and the second conduit 420. It should be understood that even if an accidental current comes into contact with the fluidization chamber 100 through other means, since the chamber 110 itself is non-conductive, the current cannot be conducted to the patient's body through the chamber 110, thus further ensuring the absolute safety of patients with broken skin. At the same time, the insulating material of the chamber 110 eliminates the potential conductive hazards that may exist in the metal bed, making the fluidization chamber 100 itself a safe area, achieving intrinsic safety without relying on external grounding protection.

[0087] In some embodiments, the chamber 110 is made entirely of a first insulating material, which enables uniform insulation performance and an integrated structural design, ensuring that the fluidization chamber 100 has the same electrical safety level at any location.

[0088] In some other embodiments, the cabin 110 includes a central layer and an insulating layer completely covering the outside of the central layer. The insulating layer is made of a first insulating material and can achieve electrical isolation while ensuring mechanical strength. The central layer provides structural support, and the insulating layer provides electrical protection. This composite structure not only meets the load-bearing capacity requirements of the air-sand suspension bed, but also achieves absolute insulation of the patient contact surface, adapting to manufacturing schemes with different strength and cost requirements.

[0089] In some embodiments, the first insulating material includes at least one of fiberglass, engineering plastics, or carbon fiber composites.

[0090] This design ensures that the cabin 110 has excellent insulation properties while meeting the comprehensive requirements of medical equipment for structural strength, corrosion resistance, and ease of cleaning.

[0091] Among them, fiberglass has high strength and chemical corrosion resistance, engineering plastics are easy to mold and cost controllable, and carbon fiber composites provide excellent mechanical properties while being lightweight. By selecting the appropriate materials according to different actual conditions, the chamber 110 can have different effects such as blocking current conduction, withstanding the mechanical stress generated by the flow of microparticles inside the fluidization chamber 100, and making the surface easy to clean and disinfect, thus making it suitable for clinical environments with high infection control requirements such as burn wards.

[0092] In some embodiments, the first conduit 410 and the second conduit 420 are made of a second insulating material, which includes at least one of silicone, rubber, PVC (polyvinyl chloride) or TPU (thermoplastic polyurethane rubber).

[0093] By using a second insulating material such as silicone, rubber, PVC or TPU to make the first conduit 410 and the second conduit 420, the electrical insulation performance can be ensured while also meeting the sealing and flexibility requirements of medical-grade gas transmission.

[0094] The aforementioned second insulating material not only possesses excellent electrical insulation properties, effectively blocking current conduction and preventing leakage current from the control component 300 from being conducted to the fluidization chamber 100 through the pipeline, but also has aging resistance, corrosion resistance, and non-toxic properties, making it suitable for long-term use in medical environments. At the same time, the flexible insulating material facilitates pipeline layout and connection, ensuring the reliable operation of the gas circuit system.

[0095] Of course, in other embodiments, the second insulating material may also be other insulating and flexible materials, which will not be listed here.

[0096] Please combine Figure 1 as well as Figure 6 As shown, in some embodiments, the control component 300 includes a control box 310, which contains a sensor and a controller electrically connected to the sensor. The sensor is used to detect airflow information in the fluidization chamber 100, and the controller is electrically connected to the power component 200 to control the output power of the power component 200.

[0097] By integrating sensors and controllers into the control box 310, the control component 300 can accurately detect airflow information within the fluidization chamber 100 and adjust the output power of the power component 200 accordingly, while maintaining complete electrical isolation from the fluidization chamber 100.

[0098] Specifically, the sensor obtains airflow information in the fluidization chamber 100 by detecting the airflow transmitted through the second pipe 420. The controller generates control commands based on this information and transmits them to the power assembly 200 via an electrical connection. Since the sensor and the fluidization chamber 100 are connected only through the insulated second pipe 420, there is no direct connection with electrical wires, which fundamentally cuts off the electrical conduction path and ensures that even if leakage occurs inside the control box 310, the current will not be conducted to the fluidization chamber 100.

[0099] In some embodiments, the controller is used to control the output power of the power assembly 200 based on airflow information.

[0100] By adjusting the output power of the power component 200 in real time according to the airflow information, the controller realizes closed-loop control of the airflow intensity in the fluidization chamber 100, ensuring that the microparticles in the fluidization chamber 100 maintain a stable fluidized state.

[0101] Specifically, when the sensor detects that the airflow parameters in the fluidization chamber 100 deviate from the set value through the second pipeline 420, the controller immediately adjusts the output power of the power component 200 and delivers compressed air of the corresponding flow rate to the fluidization chamber 100 through the first pipeline 410, thereby maintaining a stable airflow support environment to meet the patient's treatment needs. Moreover, the entire control process is achieved through an insulated air path, and precise control can be achieved without any electrical connection.

[0102] Please combine Figure 1 as well as Figure 6 As shown, in some embodiments, the control box 310 is also provided with a display screen 320 electrically connected to the controller, the display screen 320 being used to display airflow information.

[0103] By installing a display screen 320, which is electrically connected to the controller, inside the control box 310, medical staff can monitor the airflow parameters inside the fluidization chamber 100 in real time, while ensuring that the display function does not compromise the electrical isolation safety design. Since the display screen 320 is located inside the control box 310 and has no electrical connection with the fluidization chamber 100, it only receives and displays the airflow information transmitted by the controller. This provides an intuitive human-machine interface, making it easy for medical staff to understand the operating status of the equipment, while maintaining the electrical isolation characteristics of the fluidization chamber 100 and avoiding the risk of leakage that may be caused by installing a display device on the bed.

[0104] In addition, medical staff can also directly control the power unit 200 through the human-machine interface of the display screen 320, thereby manually setting treatment parameters such as temperature and air volume.

[0105] In some embodiments, the sensor includes a barometric pressure sensor; the power assembly 200 includes a fan 210, and a controller is electrically connected to the fan 210 to control the output power of the fan 210.

[0106] The air pressure parameters inside the fluidization chamber 100 are monitored in real time by an air pressure sensor. The controller precisely adjusts the output power of the fan 210 based on the air pressure feedback signal to ensure that the microparticles inside the fluidization chamber 100 maintain a stable fluidized state.

[0107] Please combine Figure 1 as well as Figure 6 As shown, in some embodiments, the sensor also includes a temperature sensor for detecting the airflow temperature inside the fluidization chamber 100; the power assembly 200 also includes a heater 220 disposed at the air outlet of the fan 210, and the controller is electrically connected to the heater 220 to control the heating power of the heater 220.

[0108] The temperature sensor monitors the airflow temperature inside the fluidization chamber 100, and the controller adjusts the heating power of the heater 220 according to the temperature feedback signal to achieve precise control of the patient's treatment environment temperature and meet the thermotherapy needs in the treatment of burns or pressure ulcers.

[0109] Furthermore, since temperature detection is performed via gas sampling through the second pipeline 420, and the heating function is achieved by the heater 220 in the power assembly 200 located away from the fluidization chamber 100, the fluidization chamber 100 itself does not need to be equipped with any heating elements or temperature sensors. While providing temperature regulation function, it ensures complete isolation between the fluidization chamber 100 and all live parts, thus satisfying both the treatment function and ensuring electrical safety.

[0110] In other embodiments, the sensor may also include a humidity sensor, a flow sensor, and / or a microbial sensor, etc.

[0111] The humidity sensor is used to detect the relative humidity of the airflow inside the fluidization chamber 100 to prevent the wound from becoming too dry or too wet, which could lead to maceration. The output airflow humidity is adjusted by controlling the corresponding humidification or dehumidification module in the power assembly 200. The flow sensor is used to measure the gas flow rate or velocity through the second pipeline 420, indirectly reflecting the fluidization intensity and microparticle suspension state in the fluidization chamber 100, ensuring that the fluidized bed provides stable low-pressure support. Microbial sensors assess the infection control level within the fluidized chamber 100 by detecting the number of particulate matter or the concentration of bioaerosols in the sampled airflow, thus meeting the aseptic requirements of the burn ward.

[0112] It is worth mentioning that all the above sensors are installed in the control box 310 and gas sampling and detection are achieved through the second pipeline 420, thereby expanding the monitoring parameters while maintaining complete electrical isolation between the control component 300 and the fluidization chamber 100.

[0113] Please combine Figure 1 as well as Figure 6 As shown, in some embodiments, the power assembly 200 also includes a fan housing 230, with the heater 220 and fan 210 all housed within the fan housing 230. The modular integration of the power assembly 200 effectively reduces equipment operating noise and simplifies maintenance procedures. The fan housing 230 provides a closed mounting cavity for the fan 210, absorbing mechanical vibrations and airflow noise generated by the fan 210 through physical isolation of the housing structure. Simultaneously, integrating the fan 210 into an independent housing to form a standardized power module facilitates overall assembly and disassembly, as well as pipeline connection with the fluidization chamber 100, improving equipment maintainability and on-site installation efficiency.

[0114] Furthermore, the power assembly 200 also includes an air filter 240 disposed in the fan housing 230, the air outlet of the air filter 240 being connected to the air inlet of the adjustable speed fan 210; the air filter 240 can ensure the cleanliness of the airflow entering the fluidization chamber 100, prevent the micro-particle bed from being contaminated and protect the internal components of the fan.

[0115] Specifically, the air filter 240 is located upstream of the air inlet of the fan 210 to pre-filter the ambient air and intercept dust, fibers and other impurities in the air. The clean air is pressurized by the fan 210 and delivered to the fluidization chamber 100 to prevent foreign objects from mixing into the microparticles in the chamber and affecting the fluidization effect. At the same time, it prevents dust from accumulating on the fan blades, causing dynamic imbalance or wear, and extends the service life of the equipment.

[0116] Please combine Figure 1 as well as Figure 6 As shown, in some embodiments, the power assembly 200 further includes a sterilizer 250 disposed within the fan housing 230. The air inlet of the sterilizer 250 is connected to the air outlet of the heater 220, and is used to sterilize the airflow output by the fan 210. Specifically, the sterilizer 250 uses ozone sterilization.

[0117] Furthermore, in some embodiments, the fan 210 is an adjustable speed fan; the control component 300 is electrically connected to the adjustable speed fan and is provided with a speed selection switch, which has multiple speeds corresponding to the patient's weight range, and the multiple speeds correspond to different speed outputs of the adjustable speed fan.

[0118] Through the coordinated action of the adjustable-speed fan and the control component 300, the airflow pressure is adjusted according to the patient's weight. Specifically, since the speed selection switch has multiple speed settings corresponding to different weight ranges of the patient, and each speed setting corresponds to a different speed output of the adjustable-speed fan, medical staff can select the appropriate speed setting based on the patient's actual weight, thereby providing a suitable airflow pressure to the fluidization chamber 100. This achieves a structural conversion from weight parameters to airflow pressure, quickly matching the support needs of patients with different weights without the need for complex continuous adjustments.

[0119] For example, for lighter patients, a lower setting can be selected to allow the adjustable speed fan to run at a lower speed and output a smaller airflow pressure, preventing the patient's body from sinking excessively into the particle bed and causing uneven local pressure; while for heavier patients, a higher setting can be selected to allow the adjustable speed fan to run at a higher speed and output a larger airflow pressure, ensuring that the microparticles are fully fluidized, providing sufficient support and body pressure dispersion, thereby ensuring the therapeutic effect of preventing pressure ulcers and patient comfort.

[0120] It is understandable that when the speed selector switch on the control component 300 is switched to a specific speed, the corresponding electrical signal is transmitted to the adjustable speed fan, driving it to run at the preset speed for that speed. Since the outlet of the adjustable speed fan is connected to the fluidization chamber 100, changes in the fan speed directly alter the airflow and pressure input to the fluidization chamber 100: the higher the speed, the greater the airflow pressure, the stronger the fluidization driving ability for microparticles in the chamber, and the greater the buoyancy support formed; conversely, the airflow pressure decreases.

[0121] Of course, in some other embodiments, the gear selection switch may also have multiple gears corresponding to parameters such as the patient's BMI (body mass index), body size and / or body position.

[0122] For example, the BMI index can be labeled as "BMI<18.5 (underweight)," "18.5-24 (normal)," "24-28 (overweight)," "≥28 (obese)," etc. Compared with weight alone, BMI can better reflect the ratio of a patient's body surface area to weight. For patients with height abnormalities (such as children or gigantism), the matching of airflow support force is more accurate. The corresponding support levels for body types can be "child / thin", "standard body type", "full / muscular", "obese / edema", etc., which actually correspond to different body surface contact areas and body pressure distribution characteristics. For patients with normal weight but well-developed muscles (high density) or edema (soft tissue), it can provide differentiated support. The weight and position corresponding to the settings can be a combination of settings such as "supine - light weight", "side lying - light weight", and "prone - light weight". By adding the position dimension, it compensates for the increased pressure caused by the reduced contact area between the body and the bed surface when lying on the side.

[0123] In some embodiments, the variable speed fan is a variable speed fan having at least three fixed speed settings.

[0124] By employing a speed-adjustable fan with at least three fixed speed settings, the system structure and control logic are significantly simplified while ensuring that the needs of patients of different weights can be met through a limited number of speed settings.

[0125] The three fixed speed settings correspond to three typical patient weight types: light, medium, and heavy. This eliminates the need for complex continuous control algorithms or high-precision continuously variable transmission mechanisms to adjust the airflow pressure. The fan speed can be changed in a step-like manner simply by switching between speed settings. This design reduces the manufacturing cost and maintenance difficulty of the equipment, and improves the reliability and durability of the system. It is particularly suitable for clinical environments where rapid and intuitive operation is required and where equipment stability is critical.

[0126] Specifically, when medical staff determine that a patient belongs to a certain category based on their weight, they can directly select the corresponding gear. The fan will then switch to a preset fixed speed and output a constant airflow pressure specific to that gear to the fluidization chamber 100. This optimizes both ease of operation and equipment economy while ensuring treatment effectiveness.

[0127] In some embodiments, the first gear of the gear selection switch corresponds to a weight of 30 kg to 60 kg, the second gear corresponds to a weight of 60 kg to 90 kg, and the third gear corresponds to a weight of 90 kg to 120 kg.

[0128] This setup establishes a quantitative correspondence that closely matches the weight distribution of common patients in clinical practice. This specific interval division allows medical staff to quickly and accurately select the corresponding gear based solely on the patient's actual weight, eliminating the need for complex airflow pressure calculations or repeated experimental adjustments. This achieves an intuitive mapping from weight parameters to equipment operating parameters.

[0129] Specifically, when the patient's weight is in the lighter range of 30-60 kg, selecting the first gear will allow the adjustable speed fan to output a lower speed, generating moderate airflow pressure. This ensures that the microparticles are fully fluidized to provide the necessary support, while also preventing lighter patients from sinking excessively due to excessive air pressure. When the patient's weight is in the moderate range of 60-90 kg, the second gear provides moderate speed and air pressure to ensure even distribution of body pressure; When the patient's weight is in the heavier range of 90-120 kg, the third gear provides a higher rotation speed and air pressure to overcome the pressure caused by the greater weight and maintain the fluidization characteristics of the granular bed.

[0130] The interval-based gear design effectively solves the drawbacks of fixed-speed fans, simplifies the operation process, and ensures that patients of different weights can receive appropriate support, thereby improving the accuracy of treatment and patient comfort.

[0131] In some other embodiments, the adjustable speed fan is a continuously variable speed (CVT) fan. Using a CVT fan as the adjustable speed fan enables continuous adjustment of the fan speed within the permissible range, thereby providing precise airflow pressure control.

[0132] Compared to fixed-gear adjustment, continuously variable transmission (CVT) allows medical staff to set any intermediate speed based on the patient's specific weight or real-time comfort feedback, achieving a precise match between airflow pressure and the patient's weight.

[0133] Specifically, through a continuously variable transmission mechanism (such as a frequency converter or voltage regulator), the speed of the adjustable fan can smoothly transition between the lowest and highest speeds, and the airflow pressure input to the fluidization chamber 100 also changes continuously, avoiding pressure jumps or adaptation blind spots that may exist between fixed gears. This continuous adjustment capability is particularly suitable for patients whose weight is at the gear dividing point (such as exactly 60 kg or 90 kg), or patients with special sensitivity requirements for support. It can ensure that the microparticle bed is in the optimal fluidization state, providing the most suitable buoyancy support for individual needs, maximizing the body pressure dispersion effect, and further improving the accuracy of pressure ulcer prevention and treatment and the patient's bed comfort.

[0134] Furthermore, the adjustable speed fan can also be any other fan or air outlet device that can adjust its own speed.

[0135] Furthermore, in some other embodiments, the fan airflow / pressure can also be adjusted in other ways, such as by changing the fan intake conditions or load characteristics through mechanical structures (such as adjustable guide vanes, valve opening, etc.) to adjust the output airflow / pressure without changing the motor speed; or by connecting / switching multiple motors in parallel, with two or more constant-speed fans of different power connected in parallel, and the control component 300 selecting single-unit operation or combined operation, etc. This application will not list them all here, as long as the airflow / pressure can be adjusted.

[0136] In some embodiments, the gear selection switch is a rotary gear switch, a push-button gear switch, or a touch screen input device to meet the operational needs of different clinical environments.

[0137] Specifically, rotary gear switches achieve physical gear switching through a mechanical rotation structure, featuring intuitive operation and clear tactile feedback; push-button gear switches achieve gear switching through the on / off switching of a trigger circuit, offering clear gear differentiation and preventing accidental touches; and touchscreen input devices can integrate a visual interface, displaying weight ranges while receiving touch commands, reducing the error rate of medical staff and improving adjustment accuracy.

[0138] In addition, in some other embodiments, the gear selection switch can also be a sliding type, a toggle type, a foot pedal type, etc., as long as it can realize the selection and switching of gears. This application will not give examples of each type here.

[0139] Please refer to Figure 1 As shown, in some embodiments, the gear selection switch is a display screen 320 located in the control box 310. The display screen 320 can input information via touch and can display the airflow parameters in the fluidization chamber 100, providing an intuitive human-machine interface.

[0140] In some embodiments, the gear selection switch is set to a gear value that is positively correlated with the rotational speed of the adjustable fan.

[0141] By setting the gear value to a positive correlation with the speed of the adjustable fan, the logical consistency between weight, gear, and airflow pressure is further strengthened, making the operation more intuitive and convenient, while ensuring a reasonable match between the airflow support force and the patient's weight.

[0142] Specifically, each gear position of the gear selection switch corresponds to a different electrical signal output (such as different resistance values, voltage values, or digital codes). When a positive correlation setting is used, the higher the gear value, the stronger the output control signal (or the larger the code value). After processing by the control component, it drives the adjustable speed fan to run at a higher speed. Since the speed of the adjustable speed fan is positively correlated with the output airflow pressure, and the gear position has a corresponding relationship with the patient's weight range, a progressive support adjustment chain is formed: weight increase → gear increase → speed increase → pressure increase. This ensures that the airflow support force and the patient's weight are always kept within a reasonable mechanical matching range, thereby optimizing the body pressure dispersion effect.

[0143] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0144] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A fluidization chamber, characterized in that, The device includes a cabin (110), a perforated plate (120), and multiple support parts (130). The cabin (110) has an upward-opening accommodating cavity (111), and the bottom wall of the accommodating cavity (111) has a downward-opening air inlet (112). The support parts (130) and the perforated plate (120) are all located within the accommodating cavity (111). Each of the support parts (130) is spaced apart and fixed to the accommodating cavity (111). 11) Bottom wall, the porous plate (120) is fixed to the top of the support (130) and fits against the inner wall of the accommodating cavity (111) to divide the accommodating cavity (111) vertically into a flow guiding cavity (111a) located on the lower side and a fluidizing cavity (111b) located on the upper side. The cross-sectional area of ​​each support (130) gradually decreases along the vertical direction towards the side closer to the porous plate (120), and the outer peripheral surface is a smooth curved surface.

2. The fluidization chamber according to claim 1, characterized in that, The support part (130) is in the shape of a frustum, and the top surface of the support part (130) is flat and fits against the bottom surface of the perforated plate (120).

3. The fluidization chamber according to claim 2, characterized in that, Each of the support portions (130) is arranged at equal intervals in the accommodating cavity (111) along the horizontal direction.

4. The fluidization chamber according to claim 3, characterized in that, The vertical projection of the air inlet (112) is located at the center of each of the support portions (130).

5. The fluidization chamber according to claim 1, characterized in that, The inner wall of the accommodating cavity (111) has a stepped surface (113), the top surface of which is flush with the top of the support (130) to jointly support the perforated plate (120).

6. The fluidization chamber according to claim 5, characterized in that, The stepped surface (113) is arranged horizontally around the inner wall of the accommodating cavity (111).

7. The fluidization chamber according to claim 1, characterized in that, The flow guiding cavity (111a) is formed by the outer peripheral surface of the support (130) and the inner wall of the accommodating cavity (111). The cross-sectional area of ​​the flow guiding cavity (111a) gradually increases upward in the vertical direction to form a gradually expanding flow guiding channel.

8. The fluidization chamber according to claim 2, characterized in that, The support part (130) has a bolt hole at the center of its top surface. The perforated plate (120) has through holes that correspond one-to-one with each of the bolt holes. The perforated plate (120) and the support part (130) are fixed by bolts that pass through the through holes and are threaded to the bolt holes.

9. The fluidization chamber according to any one of claims 1 to 7, characterized in that, The support (130) is integrally formed with the cabin (110).

10. A suspended air-sand bed, characterized in that, Includes the fluidization chamber as described in any one of claims 1 to 9.

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