Cold-chain fluidized quick-freezing air guide device with flexible excitation response
By introducing resonant valves and multi-segment turbulence channels into the fluidized bed quick-freezing equipment, a multi-dimensional fluidized air curtain is formed, which solves the problems of uneven freezing and material clumping in the fluidized bed quick-freezing equipment, and realizes rapid and uniform freezing of pre-cooked dishes.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZHILIXING DIGITAL TECHNOLOGY (XUZHOU) CO LTD
- Filing Date
- 2026-02-09
- Publication Date
- 2026-04-24
AI Technical Summary
Existing fluidized bed quick-freezing equipment has problems such as unidirectional airflow, limited flow field coverage, uneven freezing, and easy clumping of materials in the cold chain transportation of pre-prepared vegetables. These problems are particularly evident in high-density or multi-layered stacked materials. Furthermore, the surface layer is prone to freezing too quickly, leading to dehydration and drying, while the interior is not frozen sufficiently.
The resonant valve structure spontaneously generates periodic expansion and rebound when cold air flows through it. Combined with a multi-segment turbulence channel group, it forms a low-frequency Karman vortex street turbulent airflow, realizing a multi-dimensional, penetrable fluidized air curtain, and enhancing the efficiency of airflow disturbance and the ability to control direction.
It significantly improves freezing uniformity, shortens freezing time by 10%-20%, avoids clumping and dehydration problems, and improves freezing efficiency and product quality.
Smart Images
Figure CN121916616A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a flexible vibration-responsive quick-freezing air guide device for guiding the quick-freezing airflow of pre-prepared vegetables during cold chain transportation. It belongs to the field of cold chain logistics technology for pre-prepared vegetables. In particular, it relates to a quick-freezing air guide device that spontaneously generates periodic expansion and rebound through a resonant valve structure when cold air flows through it, thereby exciting a low-frequency Karman vortex street-type turbulent airflow. Combined with a multi-segment turbulence channel group, the airflow generates continuous vortex disturbance, deflection, and multi-directional polarization after being ejected, thereby forming a wrapping, multi-dimensional, and permeable fluidized air curtain on the surface of the pre-prepared vegetable ingredients. Background Technology
[0002] Pre-prepared meals, as a food format integrating processing, packaging, and refrigeration, are rapidly becoming an important part of the cold chain food industry. Pre-prepared meals typically include pre-cut raw ingredients or partially cooked semi-finished ingredients. Their storage and transportation processes place high demands on freshness, texture, color, and nutrient retention. To ensure the quality stability of pre-prepared meals during cold chain transportation and end-sales, quick-freezing technology has become a key link in achieving freshness preservation. By rapidly lowering the core temperature of the ingredients to below -18°C, it not only quickly inhibits microbial growth but also minimizes tissue damage caused by recrystallization of internal moisture, thereby achieving long-term freshness, flavor restoration, and nutrient retention. Currently, the mainstream technologies applied to quick-freezing in the pre-prepared meal industry include plate freezing, air curtain tunnel freezing, and fluidized bed freezing. Among these, fluidized bed freezing technology, due to its advantages such as fast freezing speed, low unit energy consumption, and adaptability to diverse materials, is particularly popular in the pre-prepared meal field, especially for granular, sliced, and mixed products. Fluidized bed freezing relies on high-speed cold air penetrating the food layer from bottom to top, causing the food to be suspended, tumbling, and non-aggregated, thereby improving freezing uniformity and heat exchange efficiency. However, existing fluidized bed freezing equipment often uses fixed-angle or simple baffle guide structures for its air guiding system, resulting in a single airflow direction and limited flow field coverage. This leads to problems such as fluidization dead zones, uneven freezing, and slow temperature drop in the center during the freezing process, especially noticeable in pre-prepared dishes with uneven particle size or specific gravity or mixed packing. In addition, existing equipment generally relies on fans to provide continuous airflow, failing to utilize the airflow's own induced disturbance energy. It has poor control over the amplitude and direction of airflow disturbance, making it difficult to meet the fluidization requirements of high-density or multi-layered materials, easily leading to clumping, bridging, and slow local freezing. At the same time, due to concentrated local airflow or poor ventilation, pre-prepared dishes are prone to excessively rapid surface freezing, resulting in dehydration and drying, while the interior is not fully frozen, affecting the product's taste and the uniformity of subsequent reheating. Summary of the Invention
[0003] To improve the above situation, the present invention provides a cold chain fluidized quick-freezing air guide device with flexible excitation response. This device provides a quick-freezing air guide device that provides a cold air flow device that provides a cold air flow device. This cold air flow device ...
[0004] The present invention provides a cold chain fluidized bed quick-freezing air guide device with flexible vibration response, which is implemented as follows: The cold chain fluidized bed quick-freezing air guide device with flexible vibration response includes a circulation channel, an air guide shell, an air duct, a resonant valve, and a channel assembly. The system is characterized by having an excitation chamber within the air guide housing, a circulating groove located at one edge of the air guide housing to form a closed flow guiding structure, a flow guiding groove group located in the center of one side of the air guide housing, and the circulating grooves surrounding the flow guiding groove group. The circulating grooves are a closed loop structure used to stabilize the peripheral airflow and enhance the swirling or polarization of the central flow stream. The air duct is located on the other side of the air guide housing, and a swingable resonant valve is installed within the air duct. The resonant valve and the air duct are flexibly connected. When the freezing airflow passes through the air duct, the resonant valve undergoes controlled swinging and slight bouncing under the impact of the airflow, inducing low-frequency pulsating airflow and forming a Karman vortex street-like swirling airflow. In conjunction with the flow guiding groove group, the excited cold air is further divided, deflected, and rotated after passing through the diverse flow guiding groove group, generating a multi-directional three-dimensional turbulent air curtain. This effectively solves the problems of simple air field structure, insufficient turbulence efficiency, uneven freezing, and easy material agglomeration existing in existing fluidized bed quick-freezing devices. Preferably, the air guide shell has an arc-shaped structure and a curved surface. Preferably, the flow guide channel group has multiple channels. The flow guide trough assembly consists of flow guide inclined troughs, corrugated flow guide troughs, transition troughs, serpentine troughs, and reverse inclined troughs, forming diverse flow guide paths. The guide chute, corrugated guide chute, transition chute, serpentine chute, and anti-skew chute are connected end to end in sequence to form a guide chute group. Preferably, the guide trough is inclined on one side of the air guide shell, the corrugated guide trough has similar and staggered peaks and valleys, the peaks and valleys of the corrugated guide trough turn into straight bends, the transition trough connects the corrugated guide trough and the serpentine trough, the serpentine trough is a continuous arc-shaped bend with varying curvature, and the reverse sloping trough and the guide trough are in opposite directions. Beneficial effects
[0005] 1. Through the resonant valve structure set in the airway, periodic expansion and rebound can be spontaneously generated when cold air flows through, causing dynamic changes in the direction and speed of the airflow, and exciting low-frequency Karman vortex street turbulent airflow. Combined with the multi-segment turbulence grooves arranged on the surface of the air guide shell, the airflow generates continuous vortex turbulence, deflection and multi-directional polarization after being ejected, thereby forming a wrapping, multi-dimensional, and penetrable fluidized air curtain on the surface of the pre-cooked food ingredients. This significantly improves the contact efficiency between the airflow and the food per unit time, achieves rapid cooling, avoids the phenomenon of freezing on the side and internal temperature, shortens the freezing time by an average of 10%-20%, and significantly improves the uniformity of freezing.
[0006] Second, in response to the irregular cutting and mixed packaging characteristics commonly found in pre-cooked dishes, the use of composite turbulence channels can effectively change the local wind direction and velocity distribution, enabling the cold airflow to have turbulence energy and polarization intensity at different scales. This, in turn, forms a well-inclusive fluidized freezing air field in the multi-form structure of pre-cooked dishes, providing stronger freezing penetration and resistance to accumulation freezing for high-density ingredients or combination dishes.
[0007] Third, the resonant valve is a flexible self-excited structure that can induce self-oscillation through fluid without the need for external power. It requires no additional energy, has a simple structure, and a low failure rate.
[0008] Fourth, the three-dimensional turbulent air curtain can continuously disturb the boundary layer of the material surface, effectively breaking the micro-adhesion points and "freezing bridging phenomenon" between materials, avoiding the difficulty of clumping and delamination. At the same time, the airflow disturbance enhances the boundary heat transfer efficiency, reduces the evaporation of surface moisture caused by long-term wind blowing, and inhibits the problem of pre-cooked food surface drying and dehydration, resulting in poor taste. Attached Figure Description
[0009] Figure 1 This is a schematic diagram of the structure of a cold chain fluidized quick-freezing air guide device with flexible vibration response according to the present invention. Figure 2 This is a schematic diagram of the structure of a cold chain fluidized quick-freezing air guide device with flexible excitation response according to the present invention, which mainly shows the structure of the air passage and the resonant valve. Attached Figure
[0010] Among them are: Circulation groove (1), air guide shell (2), flow guide sloping groove (3), corrugated flow guide groove (4), transition groove (5), serpentine groove (6), reverse sloping groove (7), air passage (8), resonant valve (9). Detailed Implementation Example 1
[0011] The present invention provides a cold chain fluidized quick-freezing air guide device with flexible vibration response, which is implemented as follows: The cold chain fluidized quick-freezing air guide device with flexible vibration response includes a circulation channel (1), an air guide shell (2), an air duct (8), a resonant valve (9), and a channel assembly. The air guide housing (2) is characterized by having an excitation chamber inside, an annular groove (1) being disposed on one edge of the air guide housing (2) to form a closed flow guiding structure, a flow guiding groove group being disposed in the middle of one side of the air guide housing (2), and the annular groove (1) being disposed around the flow guiding groove group. The annular groove (1) is a closed structure used to stabilize the peripheral airflow and enhance the swirling of the central flow stream. The air passage (8) is located on the other side of the air guide housing (2), and a swingable resonant valve (9) is disposed inside the air passage. The valve (9) and the airway (8) are flexibly connected. When the resonant valve (9) flows through the airway (8), it undergoes controlled oscillation and slight bouncing under the impact of the airflow, inducing low-frequency pulsating airflow and forming a Karman vortex street-like swirling airflow. In conjunction with the guide channel group, the excited cold air is further divided, deflected and rotated after passing through the diverse guide channel group, generating a multi-directional three-dimensional disturbed air curtain. This effectively solves the problems of single air field structure, insufficient disturbance efficiency, uneven freezing and easy material agglomeration in existing fluidized bed quick-freezing devices. Preferably, the air guide shell (2) has an arc-shaped structure and a curved surface, which is used to enhance the airflow guiding effect against the wall; Preferably, the resonant valve (9) closes to seal the airway (8) when there is no airflow. Preferably, the resonant valve (9) is a low-temperature resistant composite elastic membrane. Preferably, the flow guide channel group has multiple channels. The flow guide trough assembly consists of a flow guide sloping trough (3), a corrugated flow guide trough (4), a transition trough (5), a serpentine trough (6), and a reverse sloping trough (7), forming a diverse flow guide path. The guide sloping sluice (3), corrugated guide sluice (4), transition sluice (5), serpentine sluice (6), and reverse sloping sluice (7) are connected end to end in sequence to form a guide sluice group. Preferably, the guide trough (3) is inclined on one side of the air guide shell (2), the corrugated guide trough (4) has similar and staggered peaks and troughs, and the peaks and troughs of the corrugated guide trough (4) turn into straight bends. The transition trough (5) connects the corrugated guide trough (4) and the serpentine trough (6). The serpentine trough (6) is a continuous arc-shaped fold with varying curvature. The reverse sloping trough (7) is in the opposite direction to the guide trough (3). Preferably, the guide sloping groove (3), corrugated guide sloping groove (4), transition groove (5), serpentine groove (6), and anti-sloping groove (7) together construct a highly complex turbulence path, which, in conjunction with the excited airflow, forms local vortices and airflow pulsation amplification zones. In use, the refrigerated air source enters the air duct (8) through the air supply system. The high-pressure cold airflow flows at high speed in the air duct (8) and impacts the resonant valve (9) set in the air duct (8). Under the impact of the cold airflow, the resonant valve (9) generates controlled periodic expansion and rebound motion, inducing a low-frequency (3-15Hz) airflow pulsation disturbance effect, and generating an unstable rotating vortex at the outlet of the air duct (8), forming a Karman vortex street-like disturbance wind field. After the cold airflow excited by the oscillation is ejected from the air duct (8), it enters the air guide shell (2). When it flows through the guide tube group on one side of the air guide shell (2), the cold air streamline is continuously disturbed, turned and bent, resulting in the airflow The velocity distribution, direction vector and rotation of the flow continue to change, further amplifying the pulsating disturbance brought about by the resonant airflow, thereby forming a multi-dimensional and multi-frequency three-dimensional turbulence effect in space. At the same time, the closed circulation channel (1) will form a stable boundary ring wind curtain, avoid the outflow of airflow out of control, enhance the focusing and rotation maintenance of the central wind bundle in the guide channel area, so that the cold air forms a cold air fluidization area with strong penetration, wide coverage and high disturbance density in the target freezing area, so that the cold chain pre-prepared food can obtain a uniform, stable and high-speed freezing effect in a short time, and reduce the problem of uneven freezing, clumping or hard outside and warm inside caused by the local dead zone of the wind field. The goal is to achieve the effect of spontaneously generating periodic expansion and rebound through the resonant valve structure when cold air flows through, thereby generating low-frequency Karman vortex street turbulent airflow. Combined with a multi-segment turbulence channel group, the airflow generates continuous vortex disturbance, deflection and multi-directional polarization after being ejected, thus forming a wrapping, multi-dimensional, and penetrable fluidized air curtain on the surface of pre-cooked food ingredients.
[0012] It should be noted that, unless otherwise explicitly specified and limited, the terms "placed," "connected," and "linked" should be interpreted broadly. For example, they can refer to fixed connections such as folded edges, rivets, pins, adhesives, and welds; detachable connections such as threaded connections, snap-fit connections, and hinges; integral connections; electrical connections; direct connections; or indirect connections via an intermediate medium; or internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.
[0013] It should be further noted that the above embodiments are preferred embodiments of the present invention. Due to space limitations, the applicant has not adopted other embodiments, but this is not intended to limit the scope of the present invention. Any person skilled in the art can make some modifications without departing from the scope of the present invention; that is, all equivalent modifications made in accordance with the present invention should be covered by the scope of the present invention.
Claims
1. A cold chain fluidized bed quick-freezing air guide device with flexible vibration response, comprising a circulation channel, an air guide shell, an air duct, a resonant diaphragm, and a channel assembly, characterized in that: The air guide shell is equipped with an excitation chamber. The circulating groove is located on one edge of the air guide shell, forming a closed airflow structure. The airflow groove group is located in the middle of one side of the air guide shell, and the circulating groove is arranged around the airflow groove group. The circulating groove is a closed structure used to stabilize the peripheral airflow and enhance the swirling of the central flow. The air passage is located on the other side of the air guide shell. The air passage is equipped with a swingable resonant valve. The resonant valve and the air passage are flexibly connected. When the freezing airflow flows through the air passage, the resonant valve undergoes controlled swinging and slight bouncing under the impact of the airflow, inducing low-frequency pulsating airflow and forming a Karman vortex street-like swirling airflow. In conjunction with the airflow groove group, the excited cold air is further divided, deflected and rotated after passing through the diverse airflow groove group, generating a multi-directional three-dimensional turbulent air curtain. This effectively solves the problems of single air field structure, insufficient turbulence efficiency, uneven freezing and easy material agglomeration in existing fluidized bed quick-freezing devices.
2. The cold chain fluidized quick-freezing air guide device with flexible vibration response according to claim 1, characterized in that... The flow guide trough assembly consists of flow guide sloping troughs, corrugated flow guide troughs, transition troughs, serpentine troughs, and reverse sloping troughs, forming diverse flow guide paths.
3. A cold chain fluidized quick-freezing air guide device with flexible vibration response according to claim 2, characterized in that... The flow guide groove is inclinedly arranged on one side of the air guide shell, and the corrugated flow guide groove has similar and staggered peaks and valleys, with the peaks and valleys of the corrugated flow guide groove turning into straight bends.
4. A cold chain fluidized quick-freezing air guide device with flexible vibration response according to claim 2, characterized in that... The transition groove connects the corrugated guide groove and the serpentine groove. The serpentine groove is a continuously curved arc groove with varying curvature. The reverse sloping groove and the guide sloping groove are in opposite directions.
5. A cold chain fluidized quick-freezing air guide device with flexible vibration response according to claim 2, characterized in that... The guide sluice, corrugated guide sluice, transition sluice, serpentine sluice, and anti-sluice together construct a highly complex turbulence path, which, together with the excitation airflow, forms local vortices and airflow pulsation amplification zones.
6. A cold chain fluidized quick-freezing air guide device with flexible vibration response according to claim 2, characterized in that... The guide trough, corrugated guide trough, transition trough, serpentine trough and anti-sloping trough are connected end to end in sequence to form a guide trough group.
7. A cold chain fluidized quick-freezing air guide device with flexible vibration response according to claim 6, characterized in that... The flow guide channel group has multiple channels.
8. A cold chain fluidized quick-freezing air guide device with flexible vibration response according to claim 1, characterized in that... The air guide shell has an arc-shaped structure and a curved surface, which is used to enhance the airflow guiding effect against the wall.
9. A cold chain fluidized quick-freezing air guide device with flexible vibration response according to claim 1, characterized in that... The resonant valve closes to seal the airway when there is no airflow.
10. A cold chain fluidized quick-freezing air guide device with flexible vibration response according to claim 9, characterized in that... The resonant valve is a low-temperature resistant composite elastic membrane.