Stepless speed change circulating air curtain door

Abstract

According to the stepless speed change circulating air curtain door, dynamic layering of cold and hot air flow on the upper portion and the lower portion of a door opening of a refrigeration house is achieved through a multi-point temperature sensor, the boundary position can be accurately adjusted according to actual cold and hot air distribution and environment changes, and the heat insulation, cold insulation and energy saving effects are remarkably improved. Meanwhile, structured guiding of a lower-layer channel is utilized, cold air naturally running off below the door of the refrigeration house is gathered to a conduction air outlet assembly, efficient cold energy recovery of a multi-stage heat exchange structure is achieved, the recovered cold energy is connected with a first heat conduction block in a closed-loop mode through a conduction rod and is reversely supplemented to the lower side of a layered air outlet assembly and the lower side of an air curtain machine, and a lower-layer air curtain is made to be at the low temperature continuously; through the synergistic effect of the circulating groove and the flow guide plate on the heat preservation partition plate, air flow obtained after cold energy recovery on the lower layer rises in an accelerated mode and converges with hot air on the upper layer on the upper side of the air guide pipeline to form high-speed rising air flow, the air speed and kinetic energy of an air curtain on the upper layer are greatly increased, invasion of external hot air is effectively blocked, and the door area heat insulation, energy saving and anti-condensation performance is optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of air curtain doors, and more specifically, to a stepless speed change circulating air curtain door. Background Art

[0002] Currently, air curtain door devices are widely used in cold storages, cold chain warehouses, and temperature-controlled door areas for food and medicine. By forming an air flow barrier, they block the direct exchange of indoor and outdoor air, reducing cold loss and the intrusion of external hot air. Such air curtain doors are usually driven by air curtain machines, which blow air horizontally or obliquely along the doorway to form an air curtain layer for isolating the cold area and the hot area, taking into account energy consumption control and dew condensation prevention. The common air curtain door has a simple structure and mainly relies on a single air curtain layer and fixed air supply parameters to achieve the heat insulation and cold insulation functions. It is widely used at the entrances and exits of various cold storages, cold chain transportation stations, and temperature-controlled factories. With the increasing demand for energy conservation and intelligence, some new air curtain doors begin to adopt stepless speed change technology, that is, through a variable frequency motor or an electronic speed regulation system, the air speed of the air curtain machine can be continuously and smoothly adjusted according to the actual working conditions, rather than being limited to the traditional fixed gears such as high, medium, and low. The stepless speed change air curtain door can automatically adjust the air supply intensity and air speed according to the personnel flow, temperature change, or environmental state at the doorway, ensuring both the isolation effect of the air curtain and further reducing energy consumption, improving the adaptability and intelligence level of the system.

[0003] However, the existing air curtain door technology has significant deficiencies: on the one hand, traditional air curtain doors generally adopt a fixed air speed and single-layer air outlet structure, and cannot adjust the air flow stratification and air speed parameters in real time according to the dynamic distribution of hot and cold air currents at the cold storage doorway, resulting in frequent fluctuations in the hot-cold interface at the upper and lower parts of the door area, and easy mixing of hot and cold air in the door area, seriously affecting the heat insulation effect. On the other hand, the cold air density is high and easy to sink and lose at the lower part of the cold storage doorway. The existing air curtain doors lack a special structure to intercept and recycle its loss path, resulting in a large amount of cold loss, increasing the refrigeration burden of the cold storage, high energy consumption, and problems such as frequent dew condensation and frosting and difficult control of environmental humidity in the door area. In addition, some fresh air replenishment or return structures fail to achieve reasonable distribution of hot and cold air currents and energy recovery, and the overall improvement in energy conservation and safety is limited, unable to meet the requirements of modern cold chain and high-standard energy conservation applications.

[0004] Therefore, in view of the above technical problems, it is necessary to provide a stepless speed change circulating air curtain door. Summary of the Invention

[0005] The purpose of the present invention is to provide a stepless speed change circulating air curtain door to solve the above problems.

[0006] In order to achieve the above purpose, the technical solution provided by an embodiment of the present invention is as follows: Continuously variable transmission circulating air curtain door, comprising: an air curtain door main frame, a layered air outlet component and a conductive air outlet component. An air outlet duct, a wind guide duct and a return duct are installed on the air curtain door main frame. Both ends of the return duct are respectively communicated with the air outlet duct and the wind guide duct. An electric night curtain is installed at one end of the return duct. A buffer chamber is provided at the connection between the air outlet duct and the return duct, and a curved guide plate is installed in the buffer chamber. The layered air outlet component is installed in the air outlet duct. The layered air outlet component includes an air curtain machine, and the air curtain machine is arranged in the air outlet duct. An air outlet splint is installed at one end of the air outlet duct, and the air outlet splint and the air curtain machine are on the same horizontal line. The conductive air outlet component is installed in the wind guide duct. An air inlet splint is installed at one end of the wind guide duct, and a plurality of uniformly distributed temperature sensors are inlaid on the inner wall of the air inlet splint.

[0007] As a further improvement of the present invention, the layered air outlet component further includes a pair of first adjustment bases fixedly connected to the bottom end of the air outlet duct. A plurality of pairs of first adjustment rods are evenly and cross-distributed at the top end of the first adjustment base. A pair of the first adjustment rods are rotatably connected by a rotating rod, and the mutually close ends of the plurality of pairs of first adjustment rods are rotatably connected by a rotating rod.

[0008] As a further improvement of the present invention, a chute is provided on the first adjustment base. A pair of the first adjustment rods close to the first adjustment base are slidably connected to the chute, and a heat preservation board is slidably connected to a pair of the first adjustment rods far from the first adjustment base.

[0009] As a further improvement of the present invention, a first heat conduction block is fixedly connected to the bottom end of the air outlet duct and located between the pair of first adjustment bases. A plurality of uniformly distributed first elastic heat conduction rods are fixedly connected to the top end of the first heat conduction block. The top ends of the plurality of first elastic heat conduction rods are fixedly connected to the heat preservation board, and a plurality of heat conduction strips are fixedly connected to the mutually close ends of the plurality of first elastic heat conduction rods.

[0010] As a further improvement of the present invention, a first electric push rod is fixedly connected to the top end of the first heat conduction block, and the output end of the first electric push rod is connected to the bottom end of the heat preservation board.

[0011] As a further improvement of the present invention, the conductive air outlet component includes a second heat conduction block, and the second heat conduction block is installed at the bottom end of the wind guide duct. Second adjustment bases are arranged at both ends of the second heat conduction block, and the second adjustment bases are installed at the bottom end of the wind guide duct.

[0012] As a further improvement of the present invention, a plurality of pairs of second adjustment rods are evenly distributed at the top end of the second adjustment base. A pair of the second adjustment rods are rotatably connected by a positioning rod, and the mutually close ends of the plurality of pairs of second adjustment rods are rotatably connected by a limiting rod.

[0013] As a further improvement of the present invention, a plurality of uniformly distributed second elastic heat-conducting rods are fixedly connected to the top end of the second heat-conducting block. A heat-insulating partition board is installed at the top ends of the plurality of second elastic heat-conducting rods. A second electric push rod is fixedly connected to the top end of the second heat-conducting block. The output end of the second electric push rod is connected to the bottom end of the heat-insulating partition board. A plurality of uniformly distributed heat-conducting absorption blocks are installed outside the second elastic heat-conducting rods. An elastic heat-conducting block is fixedly connected to the outside of the heat-conducting absorption block. One end of the elastic heat-conducting block is fixedly connected to a heat-conducting absorption fin.

[0014] As a further improvement of the present invention, a pair of the second adjusting rods close to the second heat-conducting block are slidably connected to the second adjusting base, and a pair of the second adjusting rods far from the second heat-conducting block are slidably connected to the heat-insulating partition board. A plurality of uniformly distributed conduction rods are fixedly connected to one end of the second heat-conducting block. A heat-insulating sleeve is installed outside the plurality of conduction rods, and the plurality of conduction rods are all connected to the first heat-conducting block.

[0015] As a further improvement of the present invention, a plurality of uniformly distributed flow guiding plates are installed on the inner wall of the air guiding duct and above the conduction air outlet assembly. A flow-through groove is formed in the heat-insulating partition board.

[0016] Compared with the prior art, the advantages of the present invention are as follows: This solution relies on intelligent adjustment structures such as multi-point temperature sensors, the first electric push rod, and the second electric push rod, and combines multi-level mechanical components such as the first adjusting base, the first adjusting rod, the heat-insulating board, the second heat-conducting block, the second adjusting rod, and the heat-insulating partition board to realize the dynamic stratification of the upper and lower cold and hot air flows at the cold storage door. This stratification structure can accurately adjust the position of the upper and lower demarcation line according to the actual cold and hot air distribution and environmental changes in the door area, ensure the efficient isolation of cold air and hot air at the door, minimize cold and hot convection and mixing to the greatest extent, and significantly improve the heat insulation, cold insulation, and energy-saving effects of the air curtain door. This solution uses the structured guidance of the lower channel to converge the cold air naturally lost under the cold storage door to the conduction air outlet assembly, and through multi-level heat-conducting and heat-exchanging structures such as the second heat-conducting block, the second elastic heat-conducting rod, the heat-conducting absorption block, the elastic heat-conducting block, and the heat-conducting absorption fin, realizes the efficient recovery of cold energy. The recovered cold energy is connected in a closed loop through the conduction rod and the first heat-conducting block, and is fed back to the stratified air outlet assembly and the lower side of the air curtain machine, so that the lower air curtain continuously maintains a low temperature, realizes the recycling of cold energy, greatly reduces the energy consumption of the cold storage, and prevents the ineffective loss of cold energy. Through the synergistic effect of the flow channels and the guide plates on the thermal insulation partition board, the air flow after cold energy recovery and cooling treatment in the lower layer can accelerate upward, converge with the hot air in the upper layer in the upper area of the air guide duct, and form a more concentrated high-speed upward air flow. Guided by the return duct, the buffer chamber and the curved guide plate, the wind speed and kinetic energy of the air curtain above the air outlet duct are further enhanced, greatly improving the continuity and barrier effect of the upper air curtain at the door, effectively preventing the intrusion of external hot air from floating up, optimizing the heat insulation performance of the door area, and achieving a double improvement in energy conservation and anti-condensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structural schematic diagram of the present invention; Figure 2 is a structural schematic diagram of the air outlet duct and the return duct of the present invention; Figure 3 is a structural schematic diagram of the air curtain machine of the present invention; Figure 4 is a structural schematic diagram of the layered air outlet assembly of the present invention; Figure 5 is a partial structural schematic diagram of the layered air outlet assembly of the present invention; Figure 6 is a structural schematic diagram of the conduction air outlet assembly of the present invention; Figure 7 is a partial structural schematic diagram of the conduction air outlet assembly of the present invention.

[0018] Description of the reference numerals in the drawings: 1. Main frame of the air curtain door; 2. Layered air outlet assembly; 3. Conduction air outlet assembly; 11. Air outlet duct; 12. Air guide duct; 13. Return duct; 14. Electric night curtain; 21. Air curtain machine; 22. First adjustment base; 23. First adjustment rod; 24. Rotating rod; 25. First heat conduction block; 26. First elastic heat conduction rod; 27. Heat conduction strip; 28. Heat insulation board; 29. First electric push rod; 30. Conduction rod; 31. Second heat conduction block; 32. Second adjustment base; 33. Second adjustment rod; 34. Second electric push rod; 35. Second elastic heat conduction rod; 36. Heat conduction absorption block; 37. Elastic heat conduction block; 38. Heat conduction absorption fin; 39. Thermal insulation partition board; 40. Guide plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0020] Please refer to Figure 1-7 , the continuously variable transmission circulating air curtain door, including: the air curtain door main frame 1, the layered air outlet assembly 2 and the conduction air outlet assembly 3. An air outlet pipe 11, a wind guiding pipe 12 and a return pipe 13 are installed on the air curtain door main frame 1. Both ends of the return pipe 13 are respectively communicated with the air outlet pipe 11 and the wind guiding pipe 12. An electric night curtain 14 is installed at one end of the return pipe 13. A buffer chamber is provided at the connection of the air outlet pipe 11 and the return pipe 13, and a curved guide plate is installed in the buffer chamber; the layered air outlet assembly 2 is installed in the air outlet pipe 11. The layered air outlet assembly 2 includes an air curtain machine 21. The air curtain machine 21 is arranged in the air outlet pipe 11. An air outlet splint is installed at one end of the air outlet pipe 11, and the air outlet splint and the air curtain machine 21 are on the same horizontal line; the conduction air outlet assembly 3 is installed in the wind guiding pipe 12. An air inlet splint is installed at one end of the wind guiding pipe 12, and a plurality of uniformly distributed temperature sensors are inlaid on the inner wall of the air inlet splint.

[0021] Among them, this solution includes the air curtain door main frame 1, the layered air outlet assembly 2 and the conduction air outlet assembly 3. The air curtain door main frame 1 is the load-bearing skeleton of the entire door body, with a stable structure, facilitating the integration of various functional components. There are an air outlet pipe 11, a wind guiding pipe 12 and a return pipe 13 on it. These three together constitute the basic channels for air flow circulation and cold and heat stratification. Both ends of the return pipe 13 are respectively communicated with the air outlet pipe 11 and the wind guiding pipe 12 to realize the orderly circulation of air flow inside the door body. At the same time, an electric night curtain 14 is provided at one end of the return pipe 13, which can be automatically opened and closed according to the use requirements, further improving the airtightness and energy saving of the door body.

[0022] In terms of air flow distribution and flow path, a buffer chamber is specifically provided at the intersection of the air outlet pipe 11 and the return pipe 13, and a curved guide plate is arranged in the chamber. This structural design can effectively guide the high-speed air flow rising and converging from the return pipe 13, smoothly convert its kinetic energy into a horizontal flow direction consistent with the air outlet pipe 11, avoid air flow disorder, improve the circulation efficiency, and ensure the long-term stable operation of the air curtain door.

[0023] The layered air outlet assembly 2 is the core functional component of this air curtain door and is installed in the air outlet pipe 11. This assembly includes an air curtain machine 21, which can be adjusted by continuously variable transmission to continuously and smoothly change the air supply speed and air volume. Different from the traditional fixed-gear air curtain machine, the air curtain machine 21 can automatically adjust the air speed according to the actual working conditions such as the temperature in the door area, the air flow condition or the personnel flow, so that the air curtain is always in the best working state, which can not only achieve efficient heat insulation and cold insulation, but also reduce energy consumption. An air outlet splint is installed at one end of the air outlet pipe 11 and is on the same horizontal level as the air curtain machine 21 to ensure uniform air flow stratification and distribution.

[0024] Meanwhile, the air curtain machine 21 is set to blow from left to right, and the air flow can cover the vertical height of the door opening throughout the whole process, forming a complete air barrier, reducing the problem of weak air flow in the middle caused by the large door height. At the same time, in this solution, through the horizontal circulation of the return pipe 13, the buffer chamber and the deflector, the air flow path is shorter, the energy loss is smaller, the circulation utilization rate is high, and the indoor air disturbance is small. In summary, compared with the existing top-down blowing structure, this solution forms a more uniform and stable air barrier by setting an air curtain door structure with horizontal left-to-right blowing, combined with efficient circulation and intelligent hierarchical control, effectively blocking the convection of cold and hot air, improving the door area isolation and energy-saving effect. At the same time, it is more adaptable to high large door bodies and lateral wind pressure environments, is more convenient for installation and maintenance, has less interference with the human flow line, and has stronger intelligent adaptability, overall improving the environmental adaptability and use experience of the air curtain door.

[0025] The conduction air outlet component 3 is installed in the air guide pipe 12, mainly responsible for the recovery and reuse of cold air under the cold storage door. One end of the air guide pipe 12 is equipped with an air inlet splint, and a plurality of temperature sensors are evenly inlaid on the inner wall of the air inlet splint. These sensors can monitor the temperature distribution of the air flow at each layer above and below the door area in real time, and feedback the data to the control system to drive the action of the hierarchical mechanism, realizing the intelligent dynamic adjustment of the cold and hot air stratification interface.

[0026] Through stepless speed regulation and multi-channel circulation design, intelligent stratification, efficient isolation and energy closed-loop recovery of the cold and hot air flow in the door area are realized. When the air curtain door works, the air curtain machine 21 automatically adjusts the air supply speed according to the sensor signal. The stratified air outlet component 2 and the air outlet pipe 11 cooperate to form an upper-layer high-speed hot air curtain, effectively blocking the floating of external hot air. The lower-layer cold air is structurally guided to the conduction air outlet component 3, and the cold quantity is recovered in the multi-stage heat conduction and heat exchange structure, forming a closed-loop flow through the air guide pipe 12 and the return pipe 13, further improving the cold quantity utilization rate and reducing the energy consumption of the cold storage.

[0027] Through intelligent stratification and stepless wind speed regulation, it can adapt to the changes of cold and hot air flow in the door area in real time and always maintain the efficient heat insulation state of the air curtain. On the other hand, the multi-channel circulation and energy recovery structure minimize the loss of cold quantity, significantly reduce the energy consumption of the cold storage, and at the same time ensure the dryness and anti-condensation of the door area. The overall structure is compact and the degree of automation is high, which can not only improve the energy-saving performance of the cold storage or constant temperature space, but also enhance the sealing and protection ability of the door body.

[0028] The stratified air outlet component 2 also includes a pair of first adjustment bases 22 fixedly connected to the bottom end of the air outlet pipe 11. The top of the first adjustment base 22 is provided with multiple pairs of first adjustment rods 23 evenly distributed in a cross manner. A pair of first adjustment rods 23 are rotatably connected through a rotating rod 24, and the mutually close ends of multiple pairs of first adjustment rods 23 are rotatably connected through a rotating rod.

[0029] A chute is provided on the first adjustment base 22. A pair of first adjustment rods 23 near the first adjustment base 22 are slidably connected to the chute, and a heat preservation board 28 is slidably connected to a pair of first adjustment rods 23 far from the first adjustment base 22.

[0030] At the bottom end of the air outlet duct 11 and in the middle of a pair of first adjustment bases 22, a first heat conduction block 25 is fixedly connected. At the top end of the first heat conduction block 25, a plurality of uniformly distributed first elastic heat conduction rods 26 are fixedly connected. The top ends of the plurality of first elastic heat conduction rods 26 are fixedly connected to the heat preservation board 28, and a plurality of heat conduction strips 27 are fixedly connected to one end of the plurality of first elastic heat conduction rods 26 close to each other.

[0031] A first electric push rod 29 is fixedly connected to the top end of the first heat conduction block 25, and the output end of the first electric push rod 29 is connected to the bottom end of the heat preservation board 28.

[0032] The heat conduction air outlet assembly 3 includes a second heat conduction block 31. The second heat conduction block 31 is installed at the bottom end of the air guide duct 12. Second adjustment bases 32 are provided at both ends of the second heat conduction block 31, and the second adjustment bases 32 are installed at the bottom end of the air guide duct 12.

[0033] On the top end of the second adjustment base 32, multiple pairs of uniformly distributed second adjustment rods 33 are provided. A pair of second adjustment rods 33 are rotatably connected through a positioning rod, and one end of multiple pairs of second adjustment rods 33 close to each other is rotatably connected through a limiting rod.

[0034] A plurality of uniformly distributed second elastic heat conduction rods 35 are fixedly connected to the top end of the second heat conduction block 31. A heat preservation partition board 39 is installed at the top ends of the plurality of second elastic heat conduction rods 35. A second electric push rod 34 is fixedly connected to the top end of the second heat conduction block 31, and the output end of the second electric push rod 34 is connected to the bottom end of the heat preservation partition board 39. A plurality of uniformly distributed heat conduction absorption blocks 36 are installed outside the second elastic heat conduction rods 35. An elastic heat conduction block 37 is fixedly connected to the outside of the heat conduction absorption blocks 36. One end of the elastic heat conduction block 37 is fixedly connected to a heat conduction absorption fin 38.

[0035] A pair of second adjustment rods 33 close to the second heat conduction block 31 are slidably connected to the second adjustment base 32, and a pair of second adjustment rods 33 far from the second heat conduction block 31 are slidably connected to the heat preservation partition board 39. A plurality of uniformly distributed conduction rods 30 are fixedly connected to one end of the second heat conduction block 31. A heat preservation sleeve is installed outside the plurality of conduction rods 30, and the plurality of conduction rods 30 are all connected to the first heat conduction block 25.

[0036] A plurality of uniformly distributed flow guide plates 40 are installed on the inner wall of the air guide duct 12 and above the heat conduction air outlet assembly 3. A flow through groove is provided on the heat preservation partition board 39.

[0037] Among them, the core innovation of this air curtain door solution lies in the combination of multi-point temperature sensors and a high-precision mechanical adjustment structure, achieving intelligent perception, dynamic separation, energy recovery, and wind speed and temperature optimization of the air stratification at the cold storage door. The specific principles and beneficial effects are as follows: A plurality of temperature sensors are arranged at key positions in the door area. These sensors can collect the temperature data of the incoming air at each upper and lower layer of the door in real time and feedback the information to the first electric push rod 29 and the second electric push rod 34. At the bottom end of the air outlet pipe 11, a pair of first adjustment bases 22 are fixed. A plurality of pairs of evenly crossed first adjustment rods 23 are arranged on top of them. Through the rotating rod 24 and the base chute, they can rotate and slide flexibly, realizing mechanical adjustment with synchronous height and a wide range. This system drives the insulation board 28 to achieve precise lifting, enabling it to automatically locate at the most appropriate stratification height according to the sensor data. The second heat conduction block 31, the second adjustment base 32, the second adjustment rod 33, the positioning rod, the limiting rod, and the second electric push rod 34 in the air conduction and outlet assembly 3 are the same in principle, driving the insulation partition board 39 to dynamically adjust, realizing the stratification of the hot and cold air blown inside the air outlet pipe 11, and similarly, the stratification of the hot and cold air received by the air guide pipe 12.

[0038] Since the height of the cold and hot boundary at the cold storage door changes constantly due to conditions such as the external temperature, the internal temperature of the cold storage, the door opening frequency, and the environmental wind pressure, real-time perception and automatic adjustment can always ensure that the stratification interface is exactly located at the actual junction of the hot and cold airflows, minimizing hot and cold convection and mixing to the greatest extent, improving the cold and heat insulation effect of the door, reducing energy consumption, and enhancing the economy and reliability of the cold storage operation.

[0039] Through the above adjustment mechanism, the stratified air outlet assembly 2 and the air conduction and outlet assembly 3 form upper and lower independent and controllable air flow channels according to the position of the insulation board 28.

[0040] Upper channel: It is mainly used to convey room-temperature air, forming a powerful air barrier air curtain to intercept the intrusion of external hot air floating into the cold storage. The reason for choosing room-temperature air is that the temperature difference with the external hot air is small, and it is not easy to produce condensation, which helps to keep the door area dry. At the same time, the high wind speed can effectively offset the natural upward trend of the hot air, further consolidating the blocking effect of the hot air.

[0041] Lower channel: The design of the lower channel does not directly actively convey cold air outward. Instead, considering the natural loss of cold air below the cold storage door, the lost cold air is guided to the position of the air conduction and outlet assembly 3.

[0042] Here, the cold air passes through structures such as the heat conduction absorption block 36, the elastic heat conduction block 37, and the heat conduction absorption fin 38, and exchanges heat fully with the heat exchange system in the conduction air outlet assembly 3, so that the cold quantity that was originally going to be lost is efficiently recovered, and is transmitted to the layered air outlet assembly 2 and the lower side of the air curtain machine 21 through a heat conduction closed loop. In this way, the air blown from the lower side of the air curtain machine 21 towards the layered air outlet assembly 2 is cooled, and finally a colder air curtain is formed, effectively protecting the cold quantity at the lower port of the cold storage, reducing energy consumption, and realizing the recycling of energy.

[0043] Since the loss of cold air under the door is the biggest hidden danger of the energy consumption of the cold storage, a special air curtain is set up, and a heat conduction and heat exchange structure is integrated in the air flow path, which can capture and recover the lost cold quantity to the greatest extent, reduce the burden on the cold storage, and achieve high-efficiency energy saving.

[0044] Through multi-stage heat conduction structures such as the first heat conduction block 25, the first elastic heat conduction rod 26, the heat conduction strip 27, the second heat conduction block 31, the second elastic heat conduction rod 35, the heat conduction absorption block 36, the elastic heat conduction block 37, and the heat conduction absorption fin 38, a set of efficient cold quantity recovery and transmission closed loop is built.

[0045] When the cold air in the lower layer passes through the absorption structure, its cold quantity is captured by the heat conduction absorption block 36 and the heat conduction absorption fin 38, and the heat exchange efficiency is further improved by the vibration of the elastic heat conduction block 37.

[0046] The recovered cold quantity is transmitted back to the first heat conduction block 25 through the conduction rod 30 in a closed loop, used to reduce the heat of the air blown out from the lower side of the air curtain machine 21, form a cold quantity recycling, and effectively reduce the overall energy consumption of the cold storage.

[0047] The micro-vibration of the heat conduction absorption fin 38, triggered by personnel or air flow disturbance, can further break the air flow boundary layer, enhance the heat exchange effect, and improve the cold quantity recovery rate.

[0048] On the upper layer of the cold storage door, the heat preservation partition board 39 and the diversion board 40 cooperate to optimize the air flow into a high-speed and near-room-temperature air flow. The core reason for using the room-temperature air as the upper-layer air curtain is that the temperature difference between it and the external hot air is small, and it is not easy to produce condensation, effectively preventing the condensation and frosting due to the intersection of cold and heat in the door area; at the same time, the high-speed air curtain can form a strong kinetic energy barrier, blocking the floating and penetration of the external hot air, and improving the heat insulation effect of the cold storage door area.

[0049] The higher the wind speed, the stronger the physical barrier effect of the air curtain, and the more difficult it is for the external hot air to penetrate the air curtain and enter the cold storage, thus greatly reducing the energy consumption of the cold storage.

[0050] It should be further noted that in the air guide duct 12, the air blown in from the lower side first passes through the conduction air outlet assembly 3. At this time, this air flow has absorbed a large amount of cold energy naturally lost from the cold storage. Subsequently, this part of the air that has been cooled enters the upper side of the air guide duct 12 through the flow-through slots opened on the heat preservation partition plate 39.

[0051] The lower-layer air after absorbing cold energy by the conduction air outlet assembly 3 enters the upper side of the air guide duct 12 under the guidance of the flow-through slots opened on the heat preservation partition plate 39. The design of the flow-through slots not only provides an upward channel for the air flow, but also further increases the flow velocity of the passing air flow due to its cross-sectional area contraction effect, enhancing the kinetic energy of the air flow. At the same time, the original air on the upper side of the air guide duct 12, mainly hot air at room temperature or slightly higher than room temperature, is also orderly organized into an upward flow direction under the guidance of the flow deflector 40 provided on the upper part.

[0052] In this way, the air flow on the lower side after cooling and cold energy recovery converges with the hot air on the upper side in the upper region of the air guide duct 12. After the two air flows merge, a more concentrated high-speed upward air flow is formed. This high-speed air flow mainly continues to flow upward along the upper side of the air guide duct 12. Finally, this part of the high-speed upward air flow is led out through the return duct 13 and, under the guidance of the buffer cavity and the bend flow deflector, continues to maintain its flow potential energy, strengthening the overall wind speed and heat insulation effect of the air curtain above the air outlet duct 11.

[0053] In this way, the air curtain at the upper layer of the door always maintains a state of high wind speed and high kinetic energy, minimizing the invasion of hot air and the loss of cold energy, and achieving the high energy efficiency and environmental safety of the door system.

[0054] The continuity and strength of the upper-layer air curtain are enhanced. The cold air on the lower side does not directly flow away after the cold energy is recovered, but is recycled through rising together with the hot air, reducing the net loss of cold energy in the cold storage.

[0055] The confluence of the upper-layer hot air and the lower-layer upward air flow enhances the wind speed and kinetic energy of the air curtain, maximizing the isolation of the upward floating of external hot air.

[0056] The overall air flow forms a closed-loop cycle, which is mainly used for the efficient distribution and utilization of energy and momentum, making the energy distribution more balanced and the heat management more efficient, and improving the energy-saving and anti-condensation performance of the entire door system.

[0057] Working principle: An air outlet duct 11, a wind guiding duct 12 and a return duct 13 are arranged on the main frame 1 of the air curtain door. Through the cooperation of the stratified air outlet assembly 2 and the conductive air outlet assembly 3, the intelligent stratification and efficient circulation of the air in the cold storage door area are realized. The cold air lost under the cold storage door is guided into the conductive air outlet assembly 3, and the cold quantity is recovered through a multi-stage heat exchange structure such as the second heat conduction block 31, the second elastic heat conduction rod 35, the heat conduction absorption block 36, the elastic heat conduction block 37 and the heat conduction absorption fin 38. The recovered cold quantity is connected to the first heat conduction block 25 through the conduction rod 30 and is fed back to the lower side of the stratified air outlet assembly 2 and the air curtain machine 21, so that the lower air curtain forms a cold air barrier with a lower temperature, effectively retaining the cold quantity at the lower port of the door and reducing energy consumption. The height of the upper and lower air stratification at the door is monitored in real time by a temperature sensor, and the heat preservation board 28 and the heat preservation partition board 39 are automatically adjusted by the first electric push rod 29 and the second electric push rod 34, so as to flexibly separate the cold and hot air flows and ensure that the stratification interface is always in the optimal position. The upper channel mainly conveys room-temperature air. Through the cooperation of the flow guide plate 40 and the flow-through grooves on the heat preservation partition board 39, the air flow is accelerated and rises orderly, forming a hot air air curtain with high speed and high kinetic energy, effectively blocking the upward penetration of external hot air. The air flow that has undergone cold quantity recovery and cooling treatment in the lower layer converges above the wind guiding duct 12 with the upper hot air, forming a high-speed upward air flow. Guided by the return duct 13, the buffer chamber and the curved flow guide plate, it efficiently circulates back to the upper side of the system, further enhancing the air curtain wind speed and the heat insulation barrier effect. The entire system realizes the intelligent separation of the cold and hot air flows at the cold storage door, the maximum recovery and recycling of the cold quantity through multi-point active sensing, mechanical dynamic stratification, closed-loop cold quantity recovery and high-speed air curtain optimization, greatly improving the energy efficiency, heat insulation, anti-condensation and environmental safety.

[0058] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0059] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementation manners that can be understood by those skilled in the art.

Claims

1. Continuously variable speed circulating air curtain door, characterized in that: Including: The main frame of the air curtain door (1), on which an air outlet pipe (11), a wind guiding pipe (12) and a return pipe (13) are installed. The two ends of the return pipe (13) are respectively communicated with the air outlet pipe (11) and the wind guiding pipe (12). An electric night curtain (14) is installed at one end of the return pipe (13). A buffer chamber is provided at the communication part of the air outlet pipe (11) and the return pipe (13), and a curved guide plate is installed in the buffer chamber. The stratified air outlet component (2), which is installed in the air outlet pipe (11). The stratified air outlet component (2) includes an air curtain machine (21), which is arranged in the air outlet pipe (11). An air outlet clamping plate is installed at one end of the air outlet pipe (11), and the air outlet clamping plate and the air curtain machine (21) are on the same horizontal line. The conductive air outlet component (3), which is installed in the wind guiding pipe (12). An air inlet clamping plate is installed at one end of the wind guiding pipe (12), and a plurality of uniformly distributed temperature sensors are inlaid on the inner wall of the air inlet clamping plate.

2. The stepless variable speed circulating air curtain door according to claim 1, wherein: The stratified air outlet component (2) further includes a pair of first adjustment bases (22) fixedly connected to the bottom end of the air outlet pipe (11). A plurality of pairs of first adjustment rods (23) which are uniformly and cross-distributed are arranged at the top ends of the first adjustment bases (22). A pair of the first adjustment rods (23) are rotatably connected through a rotating rod (24), and the mutually close ends of the plurality of pairs of first adjustment rods (23) are rotatably connected through a rotating rod.

3. The stepless variable speed circulating air curtain door according to claim 2, characterized in that: Chute is opened on the first adjustment base (22). A pair of the first adjustment rods (23) close to the first adjustment base (22) are slidably connected with the chute, and a heat preservation board (28) is slidably connected with a pair of the first adjustment rods (23) far from the first adjustment base (22).

4. The stepless variable speed circulating air curtain door according to claim 3, wherein: A first heat conducting block (25) is fixedly connected to the bottom end of the air outlet pipe (11) and located between the pair of first adjustment bases (22). A plurality of uniformly distributed first elastic heat conducting rods (26) are fixedly connected to the top end of the first heat conducting block (25). The top ends of the plurality of first elastic heat conducting rods (26) are fixedly connected with the heat preservation board (28), and a plurality of heat conducting strips (27) are fixedly connected to the mutually close ends of the plurality of first elastic heat conducting rods (26).

5. The stepless variable speed circulating air curtain door according to claim 4, wherein: A first electric push rod (29) is fixedly connected to the top end of the first heat conducting block (25), and the output end of the first electric push rod (29) is connected with the bottom end of the heat preservation board (28).

6. The stepless speed change circulating air curtain door according to claim 1, wherein: The conductive air outlet component (3) includes a second heat conducting block (31), which is installed at the bottom end of the wind guiding pipe (12). Second adjustment bases (32) are arranged at both ends of the second heat conducting block (31), and the second adjustment bases (32) are installed at the bottom end of the wind guiding pipe (12).

7. The stepless variable speed circulating air curtain door according to claim 6, characterized in that: A plurality of pairs of second adjustment rods (33) which are uniformly distributed are arranged at the top ends of the second adjustment bases (32). A pair of the second adjustment rods (33) are rotatably connected through a positioning rod, and the mutually close ends of the plurality of pairs of second adjustment rods (33) are rotatably connected through a limiting rod.

8. The stepless variable speed circulating air curtain door according to claim 6, characterized in that: The top of the second heat conducting block (31) is fixedly connected with a plurality of uniformly distributed second elastic heat conducting rods (35). The tops of the plurality of second elastic heat conducting rods (35) are provided with a heat preservation partition board (39). The top of the second heat conducting block (31) is fixedly connected with a second electric push rod (34). The output end of the second electric push rod (34) is connected to the bottom end of the heat preservation partition board (39). A plurality of uniformly distributed heat conducting absorption blocks (36) are installed outside the second elastic heat conducting rods (35). An elastic heat conducting block (37) is fixedly connected to the outside of the heat conducting absorption block (36). One end of the elastic heat conducting block (37) is fixedly connected with a heat conducting absorption fin (38).

9. The continuously variable transmission cyclic air curtain door according to claim 7, wherein: A pair of the second adjusting rods (33) close to the second heat conducting block (31) are slidably connected to the second adjusting base (32). A pair of the second adjusting rods (33) far from the second heat conducting block (31) are slidably connected to the heat preservation partition board (39). One end of the second heat conducting block (31) is fixedly connected with a plurality of uniformly distributed conduction rods (30). Heat preservation sleeves are installed outside the plurality of conduction rods (30), and the plurality of conduction rods (30) are all connected to the first heat conducting block (25).

10. The stepless variable speed circulating air curtain door according to claim 8, wherein: A plurality of uniformly distributed flow guiding plates (40) are installed on the inner wall of the air guiding duct (12) and above the air conduction and outlet assembly (3). A circulation groove is formed in the heat preservation partition board (39).

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