A low-temperature air-drying room with controllable temperature and humidity

Abstract

This invention discloses a temperature- and humidity-controlled low-temperature drying chamber, comprising: a drying chamber for accommodating beef strips to be dried; at least two refrigeration units for maintaining a low-temperature environment within the drying chamber; and circulating air ducts symmetrically positioned above each refrigeration unit, which accelerate the evaporation of surface moisture from the beef in the drying chamber through forced ventilation, while maintaining constant temperature and humidity conditions within the chamber. The back of each refrigeration unit is fixed to one inner wall of the drying chamber, and each refrigeration unit has a circulating air inlet on its front. The back of the circulating air ducts is installed on the upper inner wall of the drying chamber, and the front of each circulating air duct has an air outlet for supplying air into the drying chamber. Through this operating mechanism, this invention achieves more precise temperature and humidity control, higher drying efficiency, and improved product qualification rate.

Description

Technical Field

[0001] This invention belongs to the field of low-temperature drying chamber technology, and in particular to a low-temperature drying chamber with controllable temperature and humidity. Background Technology

[0002] A low-temperature drying chamber is a food processing device specifically designed for the slow dehydration and drying of meat (such as beef jerky), fruits and vegetables, and traditional Chinese medicinal herbs under controlled temperature and humidity. Its core principle is to maintain a low indoor temperature (typically 0°C to 15°C) through a refrigeration system, inhibiting microbial growth, while forced ventilation accelerates the evaporation of moisture from the material's surface, thus achieving long-term preservation while retaining flavor, color, and nutritional components. Compared to high-temperature drying or natural air drying, low-temperature drying effectively avoids protein denaturation, fat oxidation, and flavor loss, and has become a key process in high-quality meat product processing. A typical low-temperature drying chamber generally includes basic components such as an insulated shell, refrigeration unit, circulating fan, supply and return air system, and hanging racks.

[0003] Traditional air-drying chambers often employ centralized top-mounted air supply or side-mounted air supply, with air inlets and outlets arranged horizontally or spaced too far apart. When the fan blows cold air from the top or side, the airflow encounters constant resistance as it passes through densely hung beef strips, causing rapid dissipation of kinetic energy. According to Bernoulli's principle and the Darcy-Weisbach equation, the pressure drop is proportional to the square of the velocity when airflow passes through a porous medium (such as a shelf full of meat strips). Therefore, the upper area closer to the air source has higher air velocity and stronger heat exchange, while the lower area experiences a sharp drop in air velocity due to accumulated upstream resistance. For example, in a commercially available air-drying chamber, the upper air velocity reached 1.2 m / s, while the lower air velocity at 30 cm above the ground was less than 0.3 m / s, a reduction of over 75%. Insufficient air velocity directly leads to a significant decrease in the rate of moisture evaporation from the surface of the lower layer of beef. Furthermore, uneven drying results in significant differences in product rehydration properties, taste, and color, failing to meet the consistency requirements of the high-end market. Summary of the Invention

[0004] The purpose of this invention is to provide a temperature and humidity controllable low-temperature drying chamber to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a temperature and humidity controllable low-temperature drying chamber, comprising: A drying room, used to hold beef strips that are to be air-dried; At least two refrigeration units should be installed to maintain a low-temperature environment inside the drying room; The circulating air duct is symmetrical with the refrigeration unit and located directly above each refrigeration unit. Through forced ventilation, it accelerates the evaporation of moisture on the surface of the beef in the drying chamber, while maintaining constant temperature and humidity conditions in the room. The back of each refrigeration unit is fixed to the inner wall of one side of the drying chamber, and the front of each refrigeration unit is provided with a circulating air inlet. The back of the circulating air supply duct is installed on the upper part of the inner wall of the drying chamber, and the front of each circulating air supply duct has an air supply inlet for supplying air into the drying chamber.

[0006] In this preferred embodiment, the top surface of each circulating air duct is close to the ceiling of the drying room, and the air supply end of each circulating air duct is equipped with a detachable air filter assembly, the top surface of which is flush with the top surface of the circulating air duct.

[0007] In a preferred embodiment, the detachable air filter assembly has an inverted L-shaped structure, and the detachable air filter assembly has a hollow flow channel for ventilation. The top of the inverted L-shaped detachable air filter assembly is connected to the air supply end of the circulating air supply duct.

[0008] In a preferred embodiment of this solution, the detachable air filter assembly is installed with the circulating air duct via a quick-release structure. A silicone sealing gasket is bonded to the outer periphery of the air outlet and to the front outer wall of the circulating air duct. The top outer wall of the detachable air filter assembly is pressed against the silicone sealing gasket.

[0009] In a preferred embodiment of this solution, the quick-release structure includes a U-shaped positioning frame plate welded to the top surface of the circulating air duct, a positioning insert plate welded to the top surface of the detachable air filter assembly, and threaded holes respectively opened on the top surfaces of the U-shaped positioning frame plate and the positioning insert plate.

[0010] In this preferred embodiment, when the positioning insert plate is inserted into the U-shaped positioning frame plate, the threaded holes of the positioning insert plate and the U-shaped positioning frame plate are aligned and locked together by locking bolts, so that the detachable air filter assembly is tightly abutted and attached to the outer wall of the silicone sealing gasket.

[0011] In a preferred embodiment of this design, each of the detachable air filter components has a dust filter screen on the outer wall of the side facing away from the circulating air supply duct and aligned with the air supply outlet. Below the dust filter screen and located on the outer wall of the detachable air filter component, airflow direct-blowing louvered fins, a first inclined louvered fin, and a second inclined louvered fin are sequentially arranged. The airflow direct-blowing louvered fins deliver air in a horizontal state, while the first and second inclined louvered fins both deliver air in an inclined downward state.

[0012] In this preferred embodiment, the flow channels of the dust filter, the direct-blowing louvered fan fins, the first inclined louvered fan fins, and the second inclined louvered fan fins are all connected to the inner cavity of the detachable air filter assembly. The outer wall of the detachable air filter assembly away from the circulating air supply duct has an insertion port that connects to the inner cavity of the detachable air filter assembly. An airflow purification filter is inserted into the insertion port. The airflow purification filter has a filter element, which is located behind the dust filter, the direct-blowing louvered fan fins, the first inclined louvered fan fins, and the second inclined louvered fan fins in the detachable air filter assembly.

[0013] In this preferred embodiment, each of the detachable air filter components has a gas guide plate fixed to the top of the side facing away from the circulating air duct. The other end of the gas guide plate is fixed to the inner wall of the other side of the drying chamber. The gas guide plate has a wave-like structure and includes a first concave end, a convex end, and a second concave end. The bottom surface of the gas guide plate has two symmetrically opened guide grooves.

[0014] In this preferred embodiment, a rotating shaft is rotatably mounted on the inner wall of each of the second recessed ends via a bearing. The rotating shaft has multiple airflow deflecting fan blades arranged in a ring around its periphery. The rotating shaft is inclined. When the air is output from the dust filter and impacts the airflow deflecting fan blades, it can drive the rotating shaft to rotate. At the same time, this rotation can again drive the airflow to change direction, thereby satisfying the rapid evaporation of moisture on the surface of beef at different locations in the drying chamber.

[0015] Compared with the prior art, the technical effects and advantages of the present invention are as follows: This temperature- and humidity-controlled low-temperature drying chamber utilizes a design that symmetrically arranges at least two sets of refrigeration units within the chamber, with corresponding circulating air ducts positioned directly above each unit. This creates a vertical closed-loop airflow path of "lower return air - upper supply air." This layout leverages the physical properties of rising hot air and higher density humid air, allowing the refrigeration units to efficiently draw in the higher-humidity return air from the lower middle section of the chamber through the front-facing circulating air inlet. After cooling and dehumidification, the air is then forced downwards through the upper circulating air ducts and air outlets.

[0016] This symmetrical structure, with the cold source and air supply vertically coupled, effectively avoids problems such as airflow short-circuiting, large local temperature differences, and insufficient drying in the lower layers caused by traditional single-sided or top-concentrated air supply. This achieves a high degree of uniformity in the indoor temperature and humidity fields, ensuring the beef strips are kept in a consistent low-temperature, low-humidity environment throughout the drying space, significantly improving the consistency of drying quality. Compared to the uneven drying phenomena commonly found in existing technologies, such as "dry at the top and wet at the bottom" and "fast at the beginning and slow at the end," this solution, through the aforementioned operating mechanism, achieves more precise temperature and humidity control, higher drying efficiency, and improved product qualification rate. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the disassembled structure of the detachable air filter assembly of the present invention; Figure 3 This is a schematic diagram of the gas guide plate of the present invention.

[0019] Explanation of reference numerals in the attached figures: In the diagram: 1. Drying chamber; 2. Refrigeration unit; 3. Circulating air inlet; 4. Circulating air supply duct; 5. Quick-release structure; 6. Detachable air filter assembly; 7. Gas guide plate; 8. Airflow deflector assembly; 9. Air supply inlet; 10. Silicone sealing gasket; 11. Positioning insert; 12. U-shaped positioning frame plate; 13. Locking bolt; 14. Dust filter; 15. Direct airflow louvered fan fins; 16. First inclined louvered fan fins; 17. Second inclined louvered fan fins; 18. Airflow purification filter; 19. Filter assembly; 20. Handle; 21. Airflow guide groove; 22. First concave end; 23. Convex end; 24. Second concave end; 25. Airflow deflector fan blades; 26. Rotating shaft. Detailed Implementation

[0020] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0021] Unless otherwise defined, the directions mentioned herein, such as up, down, left, right, front, back, inside, and outside, are based on the directions shown in the figures of this invention, and are explained here together.

[0022] This embodiment provides, for example Figures 1 to 3 The temperature and humidity controllable low-temperature drying chamber shown includes: Air drying chamber 1 is used to hold beef strips to be air dried and to create a low-temperature air drying environment with controllable temperature and humidity inside it; At least two refrigeration units 2 are provided to maintain a low-temperature environment in the drying chamber 1. The circulating air duct 4 is symmetrical to the refrigeration unit 2 and located directly above each refrigeration unit 2. Through forced ventilation, it accelerates the evaporation of moisture on the surface of the beef in the drying chamber 1, while maintaining constant temperature and humidity conditions in the room. Each refrigeration unit 2 is fixed to the inner wall of one side of the drying chamber 1 on its back side. Each refrigeration unit 2 is provided with a circulating air inlet 3 on its front side. The back side of the circulating air supply duct 4 is installed on the upper part of the inner wall of the drying chamber 1. Each circulating air supply duct 4 has an air supply outlet 9 on its front side that supplies air into the drying chamber 1.

[0023] In this embodiment, the top surface of each circulating air supply duct 4 is close to the ceiling of the drying chamber 1, and each circulating air supply duct 4 is equipped with a detachable air filter assembly 6 at its air supply end. The top surface of the detachable air filter assembly 6 is flush with the top surface of the circulating air supply duct 4. By providing a detachable air filter assembly 6 with its top surface flush with the duct at the air supply end of each circulating air supply duct 4, the airflow can maintain a parallel, wall-hugging flow state before entering the drying chamber 1, avoiding local eddies or airflow separation caused by protruding structures. At the same time, this layout makes full use of the top space of the drying chamber, making the air supply path closer to the upper edge of the beef hanging area, shortening the effective air supply distance. Compared with the airflow turbulence caused by the outward protrusion or positional offset of the air supply outlet in the prior art, this design achieves a more stable initial airflow distribution and higher air supply efficiency.

[0024] In this embodiment, the detachable air filter assembly 6 has an inverted L-shaped structure. The detachable air filter assembly 6 has a hollow flow channel for ventilation, and its top end is connected to the air outlet of the circulating air duct 4. By designing the detachable air filter assembly 6 as an inverted L-shape with a built-in through-hole hollow flow channel, the lateral airflow from the circulating air duct 4 can be smoothly redirected into a vertically downward or obliquely downward outlet airflow, effectively reducing pressure loss and turbulence intensity at the flow channel bends. The L-shaped structure also naturally guides the flow of dust and condensate, preventing accumulation and blockage. Compared to traditional straight-cylinder or elbow-welded structures, this design significantly improves airflow efficiency and enhances self-cleaning capabilities while maintaining a compact structure.

[0025] In this embodiment, the detachable air filter assembly 6 is installed to the circulating air duct 4 via a quick-release structure 5. A silicone sealing gasket 10 is bonded to the outer periphery of the air outlet 9 and to the front outer wall of the circulating air duct 4. The top outer wall of the detachable air filter assembly 6 is pressed against the silicone sealing gasket 10. By using the quick-release structure 5 in conjunction with the silicone sealing gasket 10 to connect the detachable air filter assembly 6 to the circulating air duct 4, the assembly forms an elastic seal by compressing the silicone gasket during installation, ensuring airtightness while avoiding vibration noise or seal failure caused by rigid connections. When cleaning or replacing the filter, it can be completely removed simply by loosening the locking mechanism, without the need for tools. Compared with the prior art that uses screws for full circumferential fixing or welding for non-removable structures, this design combines high sealing performance with extremely high maintenance convenience, significantly reducing downtime for cleaning.

[0026] In this embodiment, the quick-release structure 5 includes a U-shaped positioning frame plate 12 welded to the top surface of the circulating air duct 4, a positioning insert plate 11 welded to the top surface of the detachable air filter assembly 6, and threaded holes respectively opened on the top surfaces of the U-shaped positioning frame plate 12 and the positioning insert plate 11. By specifying the quick-release structure 5 as a combination of the U-shaped positioning frame plate 12, the positioning insert plate 11, and the aligned threaded holes, and tightening and sealing it with locking bolts 13 after insertion, the detachable air filter assembly 6 has a dual guarantee mechanism of "positioning first, then locking" during installation. The U-shaped frame provides lateral limitation, the insert plate provides longitudinal guidance, and the bolts finally apply uniform clamping force. This mechanical cooperation method avoids the warping and air leakage problem caused by single-point locking, ensuring that the silicone sealing gasket 10 is subjected to uniform force and is reliable in the long term. Compared with the "one end tight, one end loose" phenomenon often seen in existing quick-installation structures, this design achieves rapid assembly with high repeatability and long-term reliable airtight performance.

[0027] In this embodiment, when the positioning insert plate 11 is positioned and inserted into the U-shaped positioning frame plate 12, the threaded holes of the positioning insert plate 11 and the U-shaped positioning frame plate 12 are aligned and locked together by the locking bolt 13, so that the detachable air filter assembly 6 is tightly abutted and attached to the outer wall of the silicone sealing gasket 10.

[0028] In this embodiment, a dust filter 14 is provided on the outer wall of each detachable air filter assembly 6 facing away from the circulating air supply duct 4 and aligned with the air supply outlet 9. Below the dust filter 14 and on the outer wall of the detachable air filter assembly 6, airflow direct-blowing louver fins 15, first inclined louver fins 16, and second inclined louver fins 17 are arranged in sequence. The airflow direct-blowing louver fins 15 deliver air in a horizontal state, while the first inclined louver fins 16 and the second inclined louver fins 17 both deliver air in an inclined downward state. The downward tilt angle of the first inclined louver fins 16 is 45°, and the downward tilt angle of the second inclined louver fins 17 is 20°. This allows the air to be delivered from the circulating air supply duct 4 to the detachable air filter assembly 6 from different angles, thereby improving the air delivery efficiency. By integrating a dust filter 14 and three sets of louvered fins with different inclination angles on the air outlet side of the detachable air filter assembly 6, the horizontal airflow directly blows onto the louvered fins 15, the first inclined louvered fin 16 at a 45° angle, and the second inclined louvered fin 17 at a 20° angle. This splits the same purified airflow into three jets with different coverage characteristics. The horizontal flow covers the densely packed upper and middle layers, the 45° angled flow powerfully penetrates the gaps in the middle layer, and the 20° angled flow gently acts on the surface of the lower layer of beef to prevent it from cracking. This multi-angle coordinated air delivery mechanism effectively solves the problem of "overly dry upper layers and dry lower layers" caused by traditional single-direction air delivery. Compared with the limitations of existing technologies that rely solely on fan speed to adjust airflow without changing the airflow direction, this design achieves precise airflow distribution in the spatial dimension, significantly improving the uniformity of drying throughout the room.

[0029] In this embodiment, the flow channels of the dust filter 14, the direct airflow louvered fan fins 15, the first inclined louvered fan fins 16, and the second inclined louvered fan fins 17 are all in communication with the inner cavity of the detachable air filter assembly 6. The outer wall of the detachable air filter assembly 6 away from the circulating air supply duct 4 has an insertion port that passes through the inner cavity of the detachable air filter assembly 6. An airflow purification filter 18 is inserted into the insertion port. The airflow purification filter 18 has a filter element 19. A handle 20 is installed on the outer wall of the airflow purification filter 18. The filter element 19 is located behind the dust filter 14, the direct airflow louvered fan fins 15, the first inclined louvered fan fins 16, and the second inclined louvered fan fins 17 in the detachable air filter assembly 6. By connecting the dust filter 14, each louvered airflow channel, and the inner cavity of the detachable air filter assembly 6, and installing a pluggable airflow purification filter 18 with a handle 20 at its end, and arranging the filter element 19 behind all air outlet structures, the air undergoes two stages of filtration—primary filtration and high-efficiency filtration—before entering the louvered air outlet channels, effectively intercepting micron-sized particles and microorganisms. The pluggable structure, combined with the external handle, allows for quick replacement of the deep-purification filter without shutting down the system. Compared to existing drying chamber designs that only have a single-layer filter at the return air inlet and no purification measures at the air supply end, this solution significantly improves the cleanliness of the supplied air, effectively preventing secondary contamination, and is particularly suitable for meat processing with high hygiene standards.

[0030] In this embodiment, a gas guide plate 7 is fixed to the top of the side of each detachable air filter assembly 6 facing away from the circulating air duct 4. The other end of the gas guide plate 7 is fixed to the inner wall of the other side of the drying chamber 1. The gas guide plate 7 has a wave-like structure and includes a first concave end 22, an upper convex end 23, and a second concave end 24. Two guide grooves 21 are symmetrically opened on the bottom surface of the gas guide plate 7. By fixing a wave-like gas guide plate 7 spanning the width of the drying chamber to the top of the detachable air filter assembly 6, the structure of which includes alternating first concave end 22, upper convex end 23, and second concave end 24, and two guide grooves 21 opened on the bottom surface, the directional airflow delivered from the louvers undergoes multiple reflections, diffusions, and convergences after contacting the wave plate, forming a transverse disturbance vortex and breaking the laminar boundary layer; the guide grooves guide part of the airflow to flow directionally along the bottom of the plate, enhancing the disturbance in the low-altitude region.

[0031] In this embodiment, a rotating shaft 26 is rotatably mounted on the inner wall of each second recessed end 24 via bearings. Multiple airflow deflecting fan blades 25 are arranged in a ring around the rotating shaft 26. The rotating shaft 26 is inclined. When air is output from the dust filter 14 and impacts the airflow deflecting fan blades 25, it drives the rotating shaft 26 to rotate. This rotation also causes the airflow to change direction again, thus achieving rapid evaporation of moisture from the surface of the beef at different locations in the drying chamber 1. The rotating shaft 26 is located between two guide channels 21. By installing the ring array of airflow deflecting fan blades 25 supported by the rotating shaft 26 on the inner wall of the second recessed end 24, and setting them at an angle between the guide channels 21, the high-speed airflow impacts the fan blades, driving them to rotate. The rotating fan blades continuously change the local airflow direction, forming a dynamic pulsating micro-vortex. This passive self-driven turbulence requires no additional motor or energy input, yet it continuously disrupts the static air film on the surface of the beef strips, accelerating moisture evaporation. Compared with existing technologies that rely on increasing fan power to enhance disturbance, leading to increased energy consumption and product deformation, this design achieves efficient mass transfer enhancement at the microscale with zero energy consumption, making it particularly suitable for deep drying needs in high-density suspended scenarios.

[0032] Working principle This temperature- and humidity-controlled low-temperature drying chamber has at least two refrigeration units 2 symmetrically installed on the inner walls of both sides of the drying chamber 1. Upon power-on, it begins operation, using an internal refrigeration circulation system to stably control the air temperature within the drying chamber 1 at a low temperature range of 0°C to 15°C, inhibiting microbial growth and providing a safe drying environment for the beef strips. The refrigeration units 2 have a circulating air inlet 3 on their front side, used to draw in the recirculated air that has already participated in the drying process within the drying chamber 1. The air, after being cooled and dehumidified, is then sent into the circulating air supply duct 4 directly above it, forming a vertical airflow circulation path of "downward suction and upward delivery."

[0033] The circulating air supply duct 4 is located on the upper inner wall of the drying chamber 1, and its front is equipped with an air supply mesh 9. After the airflow flows out of the air supply mesh 9, it immediately enters the detachable air filter assembly 6, which is sealed to its top. This assembly is inverted L-shaped and has a through hollow flow channel inside to ensure smooth airflow. The detachable air filter assembly 6 is connected to the circulating air supply duct 4 through a quick-release structure 5: after the positioning insert plate 11 is inserted into the U-shaped positioning frame plate 12, it is fixed by the locking bolt 13, and at the same time, the sealing silicone gasket 10 is pressed against the outer wall of its top to ensure airtightness. When cleaning or replacement is required, it can be quickly disassembled by simply loosening the bolt, which is convenient. After the airflow enters the detachable air filter assembly 6, it first flows through the airflow purification filter 18, in which the built-in filter element 19 removes dust, odors and potential microorganisms to ensure that the air delivered to the drying area is clean and uncontaminated. The airflow purification filter 18 is inserted through the socket and is easy to pull out for cleaning or replacement with the handle 20. Then the dust filter 14 intercepts particulate impurities; The purified airflow is output in three directions from the outlet area of ​​the detachable air filter assembly 6: Horizontal direct airflow: The airflow is directly blown out of the louvered fan fins 15 at a 0° horizontal direction to cover the middle and upper layers of suspended beef; Large-angle downward blowing: The air is delivered downward at a 45° angle through the first inclined louvered fan fin 16, penetrating the middle layer of dense hanging racks; Gentle blowing at a small angle: The second inclined louvered fan fin 17 delivers the air at a downward angle of 20°, gently acting on the surface of the lower layer of beef, avoiding strong winds that could cause deformation or cracking.

[0034] The combined effect of the three angles significantly improves the uniformity of airflow in the vertical and horizontal directions within the drying chamber, eliminating the "dead corners" and "low-speed zones" found in traditional drying chambers.

[0035] A detachable air filter assembly 6 has a wavy gas guide plate 7 spanning the width of the drying chamber 1 fixed to its top. Its structure includes alternating first concave ends 22, convex ends 23, and second concave ends 24. This wavy design breaks the straight airflow, causing the air to vortex and diffuse in the lateral space, enhancing the overall air mixing effect. On the inner wall of each second concave end 24, an airflow deflector blade 25 supported by a rotating shaft 26 is installed. When a high-speed airflow is ejected from the dust filter area 14 and impacts the blade, it drives the rotating shaft 26 to rotate. Because the rotating shaft 26 is installed at an angle and located between the two guide channels 21, its rotation not only consumes some of the airflow energy but also disperses the originally directional airflow into a multi-directional, pulsating micro-airflow. This passive, self-driven turbulence mechanism requires no additional motor and can create a continuously changing micro-environmental wind field around the beef strips, effectively stripping away the attached water film and significantly increasing the moisture evaporation rate. It is especially suitable for drying beef strips with high hanging density and irregular shapes.

[0036] After undergoing multi-stage air supply and directional turbulence, the air fully contacts the surface of the beef strips in the drying chamber 1, carrying away moisture and then sinking. It is then drawn back into the circulating air inlet 3 of the bottom refrigeration unit 2, entering the next closed-loop cycle of "cooling-dehumidification-filtration-multi-directional air supply-turbulence". The entire system, through the adjustment of the cooling capacity of the refrigeration unit 2, the control of the circulating fan speed, and the coordination of the multi-stage air supply structure, ensures that the temperature fluctuation in the drying chamber 1 is ≤±1°C, and the relative humidity is maintained within the ideal drying range of 50%~65%, ensuring that the beef strips are slowly and evenly dehydrated, preserving their flavor and nutrients.

[0037] It should be noted that, in this document, relational terms such as "one" and "two" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A temperature- and humidity-controlled low-temperature drying chamber, characterized in that, include: Air drying room (1), used to hold beef strips to be air dried; At least two refrigeration units (2) are provided to maintain the low temperature environment in the drying room (1); The circulating air duct (4) is symmetrical to the refrigeration unit (2) and located directly above each refrigeration unit (2). Through forced ventilation, it accelerates the evaporation of moisture on the surface of the beef in the drying chamber (1) while maintaining constant temperature and humidity conditions in the room. Each of the refrigeration units (2) is fixed to the inner wall of one side of the drying chamber (1) on the back side. Each of the refrigeration units (2) is provided with a circulating air inlet (3) on the front side. The circulating air supply pipe (4) is installed on the upper part of the inner wall of the drying chamber (1) on the back side. Each of the circulating air supply pipes (4) has an air supply inlet (9) on the front side that supplies air into the drying chamber (1).

2. The temperature- and humidity-controlled low-temperature drying chamber according to claim 1, characterized in that: The top surface of each of the circulating air supply ducts (4) is close to the ceiling of the drying room (1), and each of the circulating air supply ducts (4) is provided with a detachable air filter assembly (6) at the air supply end, the top surface of the detachable air filter assembly (6) being flush with the top surface of the circulating air supply duct (4).

3. The temperature- and humidity-controlled low-temperature drying chamber according to claim 2, characterized in that: The removable air filter assembly (6) has an inverted L-shaped structure and a hollow flow channel for ventilation. The top of the inverted L-shaped removable air filter assembly (6) is connected to the air supply end of the circulating air supply duct (4).

4. The temperature- and humidity-controlled low-temperature drying chamber according to claim 3, characterized in that: The detachable air filter assembly (6) is installed with the circulating air duct (4) via a quick-release structure (5). A silicone sealing gasket (10) is bonded to the outer periphery of the air outlet (9) and the front outer wall of the circulating air duct (4). The top outer wall of the detachable air filter assembly (6) is pressed against the silicone sealing gasket (10).

5. A temperature- and humidity-controlled low-temperature drying chamber according to claim 4, characterized in that: The quick-release structure (5) includes a U-shaped positioning frame plate (12) welded to the top surface of the circulating air duct (4), a positioning insert plate (11) welded to the top surface of the detachable air filter assembly (6), and threaded holes respectively opened on the top surfaces of the U-shaped positioning frame plate (12) and the positioning insert plate (11).

6. The temperature- and humidity-controlled low-temperature drying chamber according to claim 5, characterized in that: When the positioning insert (11) is inserted into the U-shaped positioning frame plate (12), the threaded holes of the positioning insert (11) and the U-shaped positioning frame plate (12) are aligned and locked together by the locking bolt (13), so that the detachable air filter assembly (6) is tightly abutted against and attached to the outer wall of the silicone sealing gasket (10).

7. A temperature- and humidity-controlled low-temperature drying chamber according to claim 6, characterized in that: Each of the removable air filter components (6) has a dust filter (14) on the side of its outer wall facing away from the circulating air duct (4) and aligned with the air outlet (9). Below the dust filter (14) and on the outer wall of the removable air filter component (6), there are sequentially arranged airflow direct blowing louver fins (15), first inclined louver fins (16), and second inclined louver fins (17). The airflow direct blowing louver fins (15) deliver air in a horizontal state, while the first inclined louver fins (16) and the second inclined louver fins (17) both deliver air in an inclined downward state.

8. A temperature- and humidity-controlled low-temperature drying chamber according to claim 7, characterized in that: The flow channels of the dust filter (14), the direct airflow louvered fan fins (15), the first inclined louvered fan fins (16), and the second inclined louvered fan fins (17) are all connected to the inner cavity of the detachable air filter assembly (6). The outer wall of the detachable air filter assembly (6) away from the circulating air supply pipe (4) has an insertion port that connects to the inner cavity of the detachable air filter assembly (6). An airflow purification filter (18) is inserted into the insertion port. The airflow purification filter (18) has a filter element (19). The filter element (19) is located behind the dust filter (14), the direct airflow louvered fan fins (15), the first inclined louvered fan fins (16), and the second inclined louvered fan fins (17) in the detachable air filter assembly (6).

9. A temperature- and humidity-controlled low-temperature drying chamber according to claim 8, characterized in that: Each of the removable air filter components (6) has a gas guide plate (7) fixed on the top of the side facing away from the circulating air duct (4). The other end of the gas guide plate (7) is fixed on the inner wall of the other side of the drying chamber (1). The gas guide plate (7) has a wave-shaped structure and includes a first concave end (22), a convex end (23), and a second concave end (24). The bottom surface of the gas guide plate (7) is symmetrically provided with two guide grooves (21).

10. A temperature- and humidity-controlled low-temperature drying chamber according to claim 9, characterized in that: A rotating shaft (26) is rotatably mounted on the inner wall of each of the second recessed ends (24) via a bearing. The rotating shaft (26) has multiple airflow deflecting fan blades (25) arranged in a ring around its periphery. The rotating shaft (26) is inclined. When the wind is output from the dust filter (14) and hits the airflow deflecting fan blades (25), it can drive the rotating shaft (26) to rotate. At the same time, this rotation can drive the airflow to change direction again, so as to meet the requirement of rapid evaporation of moisture on the surface of beef at different locations in the drying chamber (1).

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