Infinitely variable speed circulation air curtain door

Abstract

The present invention discloses an infinitely variable speed circulating air curtain door. The present invention relies on multi-point temperature sensors to realize dynamic stratification of hot and cold air flows above and below the cold storage door, and can accurately adjust the position of the dividing line according to the actual distribution of hot and cold air and environmental changes, significantly improving the heat insulation, cold insulation and energy saving effects. At the same time, the structured guidance of the lower channel is used to converge the cold air naturally lost below the cold storage door to the conduction air outlet component, realizing the multi-stage heat exchange structure to efficiently recover cold energy. The recovered cold energy is connected to the first heat conduction block in a closed loop through the conduction rod, and is fed back to the stratified air outlet component and the lower side of the air curtain machine, so that the lower air curtain continues to be low in temperature. Through the synergistic effect of the flow groove and the guide plate on the thermal insulation partition plate, the air flow after the lower cold energy is recovered accelerates to rise, and converges with the upper hot air on the upper side of the air guide duct to form a high-speed rising air flow, which greatly enhances the wind speed and kinetic energy of the upper air curtain, effectively blocks the invasion of external hot air, and optimizes the door area's heat insulation and energy-saving anti-condensation performance.

Description

Technical Field

[0001] The present invention relates to the technical field of air curtain doors, and more particularly to an infinitely variable speed circulating air curtain door. Background Art

[0002] At present, air curtain door devices are widely used in cold storage, cold chain storage, and constant temperature door areas of food and medicine. They form an airflow barrier to block the direct exchange of indoor and outdoor air, reduce cold loss and external hot air intrusion. This type of air curtain door is usually driven by an air curtain machine, which blows the airflow horizontally or diagonally along the doorway to form a layer of air curtain to isolate the cold area from the hot area, taking into account energy consumption control and condensation protection. Common air curtain doors have a simple structure and mainly rely on a single air curtain layer and fixed air supply parameters to achieve heat insulation and cold isolation functions. They are widely used in various cold storages, cold chain transportation stations and constant temperature factory entrances and exits. With the increasing demand for energy saving and intelligence, some new air curtain doors have begun to adopt stepless speed change technology, that is, through a variable frequency motor or electronic speed control system, the wind speed of the air curtain machine can be continuously and smoothly adjusted according to the actual working conditions, and is no longer limited to the traditional fixed gears such as high, medium and low. The infinitely variable speed air curtain door can automatically adjust the air supply intensity and wind speed according to the flow of people at the door, temperature changes or environmental conditions, which not only ensures the isolation effect of the air curtain, but also further reduces energy consumption and improves the adaptability and intelligence level of the system.

[0003] However, the existing air curtain door technology has significant shortcomings: on the one hand, traditional air curtain doors generally adopt a fixed wind speed and single-layer air outlet structure, and are unable to adjust the airflow stratification and wind speed parameters in real time according to the dynamic distribution of hot and cold air flows at the cold storage door, resulting in frequent fluctuations in the hot and cold interface in the door area, and hot and cold air are easily mixed in the door area, seriously affecting the insulation effect. On the other hand, the cold air below the cold storage door has a high density and is easy to sink and lose. The existing air curtain door lacks a special structure to intercept and recover its loss path, resulting in a large amount of ineffective loss of cold air, increasing the refrigeration burden of the cold storage, high energy consumption, and condensation and frost often occur in the door area, and the environmental humidity is difficult to control. In addition, some fresh air supplement or return structures fail to achieve reasonable distribution and energy recovery of hot and cold air flows, and the overall energy saving and safety improvement are limited, which cannot meet the needs of modern cold chain and high-standard energy-saving applications.

[0004] Therefore, in response to the above technical problems, it is necessary to provide an infinitely variable speed circulating air curtain door. Summary of the Invention

[0005] The object of the present invention is to provide an infinitely variable speed circulating air curtain door to solve the above-mentioned problems.

[0006] In order to achieve the above-mentioned purpose, the technical solution provided by one embodiment of the present invention is as follows:

[0007] The stepless speed circulating air curtain door comprises: an air curtain door main frame, a stratified air outlet assembly and a conductive air outlet assembly, the air curtain door main frame is equipped with an air outlet duct, an air guide duct and a return duct, the two ends of the return duct are respectively connected to the air outlet duct and the air 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 curve guide plate is installed in the buffer chamber; the stratified air outlet assembly is installed in the air outlet duct, the stratified air outlet assembly includes an air curtain machine, 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 arranged on the same horizontal line; the conductive air outlet assembly is installed in the air guide duct, an air inlet splint is installed at one end of the air guide duct, and the inner wall of the air inlet splint is inlaid with a plurality of evenly distributed temperature sensors.

[0008] As a further improvement of the present invention, the layered air outlet assembly also includes a pair of first adjustment bases fixedly connected to the bottom end of the air outlet duct, and multiple pairs of evenly cross-distributed first adjustment rods are provided on the top of the first adjustment base. A pair of the first adjustment rods are rotatably connected by a rotating rod, and multiple pairs of the first adjustment rods are rotatably connected to each other near one end by a rotating rod.

[0009] As a further improvement of the present invention, a slide groove 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 slide groove, and a pair of the first adjustment rods away from the first adjustment base are slidably connected to the insulation plate.

[0010] As a further improvement of the present invention, a first heat-conducting block is fixedly connected to the bottom end of the air outlet duct and located in the middle of a pair of first adjustment bases. A plurality of evenly distributed first elastic heat-conducting rods are fixedly connected to the top end of the first heat-conducting block. The top ends of the plurality of first elastic heat-conducting rods are fixedly connected to the insulation board, and a plurality of heat-conducting strips are fixedly connected to one end of the plurality of first elastic heat-conducting rods close to each other.

[0011] As a further improvement of the present invention, a first electric push rod is fixedly connected to the top end of the first heat-conducting block, and an output end of the first electric push rod is connected to the bottom end of the insulation board.

[0012] As a further improvement of the present invention, the conductive air outlet assembly includes a second heat conductive block, which is installed at the bottom end of the air guide duct. Second adjustment bases are provided at both ends of the second heat conductive block, and the second adjustment bases are installed at the bottom end of the air guide duct.

[0013] As a further improvement of the present invention, multiple pairs of evenly distributed second adjustment rods are provided at the top of the second adjustment base, one pair of the second adjustment rods are rotatably connected by a positioning rod, and multiple pairs of the second adjustment rods are rotatably connected to each other at one end by a limiting rod.

[0014] As a further improvement of the present invention, a plurality of evenly distributed second elastic heat-conducting rods are fixedly connected to the top of the second heat-conducting block, and a thermal insulation partition plate is installed on the top of the plurality of second elastic heat-conducting rods. A second electric push rod is fixedly connected to the top of the second heat-conducting block, and the output end of the second electric push rod is connected to the bottom end of the thermal insulation partition plate. A plurality of evenly distributed heat-conducting absorption blocks are installed on the outer periphery of the second elastic heat-conducting rod, and an elastic heat-conducting block is fixedly connected to the outer periphery of the heat-conducting absorption block, and a heat-conducting absorption fin is fixedly connected to one end of the elastic heat-conducting block.

[0015] As a further improvement of the present invention, a pair of second adjustment rods close to the second heat-conducting block are slidably connected to the second adjustment base, and a pair of second adjustment rods away from the second heat-conducting block are slidably connected to the insulation partition plate. A plurality of evenly distributed conduction rods are fixedly connected to one end of the second heat-conducting block, and a plurality of conduction rods are surrounded by an insulation cover, and the plurality of conduction rods are all connected to the first heat-conducting block.

[0016] As a further improvement of the present invention, a plurality of evenly distributed guide plates are installed on the inner wall of the air guide duct and on the upper side of the air conduction and outlet assembly, and a flow groove is provided on the heat-insulating partition plate.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] This solution leverages an intelligent adjustment structure consisting of multiple temperature sensors, a first electric push rod, and a second electric push rod, combined with multi-stage mechanical components such as a first adjustment base, a first adjustment rod, an insulation plate, a second heat transfer block, a second adjustment rod, and an insulation partition plate to achieve dynamic stratification of the upper and lower hot and cold airflows at the cold storage door. This stratified structure precisely adjusts the position of the upper and lower dividing lines based on the actual distribution of hot and cold air in the door area and environmental changes, ensuring efficient isolation of hot and cold air at the door, minimizing convection and mixing of hot and cold air, and significantly improving the air curtain door's thermal and cooling insulation and energy-saving performance.

[0019] This solution utilizes structured guidance in the lower channel to channel the naturally lost cold air below the cold storage doorway to the conductive outlet assembly. This solution then efficiently recovers cold air through a multi-stage heat transfer structure consisting of a second heat transfer block, a second elastic heat transfer rod, a heat absorption block, an elastic heat transfer block, and heat absorption fins. The recovered cold air is connected in a closed loop to the first heat transfer block via the conductive rod, and then fed back to the stratified outlet assembly and the underside of the air curtain, maintaining a continuously low temperature on the lower air curtain. This allows for the recycling of cold air, significantly reducing cold storage energy consumption and preventing ineffective cold loss.

[0020] This solution uses the synergistic effect of the flow slots and guide plates on the thermal insulation partition plate to accelerate the upward flow of the lower layer of air that has undergone cold recovery and cooling treatment, and converge with the upper hot air in the upper area of ​​the air guide duct to form a more concentrated high-speed rising airflow. This airflow is guided by the return duct, buffer chamber and curved guide plate, further enhancing the wind speed and kinetic energy of the air curtain above the air outlet duct, 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 thermal insulation performance of the door area, and achieving a dual improvement in energy saving and anti-condensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the air outlet duct and the return duct of the present invention;

[0023] Figure 3 It is a structural schematic diagram of the air curtain machine of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the layered air outlet assembly of the present invention;

[0025] Figure 5 This is a schematic diagram of the partial structure of the layered air outlet component of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure of the air conduction outlet component of the present invention;

[0027] Figure 7 It is a schematic diagram of the partial structure of the air conduction outlet component of the present invention.

[0028] Description of the numbers in the figure:

[0029] 1. Air curtain door main frame; 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. 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 absorption block; 37. Elastic heat conduction block; 38. Heat absorption fin; 39. Insulation partition plate; 40. Guide plate. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only 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 ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Example

[0031] See also Figure 1-7 The stepless speed circulation air curtain door comprises: an air curtain door main frame 1, a stratified air outlet component 2 and a conduction air outlet component 3. An air outlet duct 11, an air guide duct 12 and a return duct 13 are installed on the air curtain door main frame 1. The two ends of the return duct 13 are respectively connected to the air outlet duct 11 and the air guide duct 12. An electric night curtain 14 is installed at one end of the return duct 13. A buffer chamber is provided at the connection between the air outlet duct 11 and the return duct 13, and a curve guide plate is installed in the buffer chamber; the stratified air outlet component 2 is installed in the air outlet duct 11, and the stratified air outlet component 2 includes an air curtain machine 21. The air curtain machine 21 is arranged in the air outlet duct 11, and an air outlet splint is installed at one end of the air outlet duct 11. The air outlet splint and the air curtain machine 21 are arranged on the same horizontal line; the conduction air outlet component 3 is installed in the air guide duct 12, and an air inlet splint is installed at one end of the air guide duct 12. The inner wall of the air inlet splint is inlaid with a plurality of evenly distributed temperature sensors.

[0032] Among them, this scheme includes the air curtain door main frame 1, the layered air outlet component 2 and the conductive air outlet component 3. The air curtain door main frame 1 is the load-bearing skeleton of the entire door body. The structure is stable and convenient for the integration of various functional components. There are air outlet ducts 11, air guide ducts 12 and return ducts 13 on it. These three together constitute the basic channel for air circulation and hot and cold stratification. The two ends of the return duct 13 are respectively connected to the air outlet duct 11 and the air guide duct 12 to realize the orderly circulation of airflow inside the door body. At the same time, an electric night curtain 14 is provided at one end of the return duct 13, which can be automatically opened and closed according to usage needs, further improving the sealing and energy saving of the door body.

[0033] Regarding airflow distribution and flow path, a buffer chamber is specifically designed at the junction of the outlet duct 11 and the return duct 13, and a curved deflector is placed within the chamber. This structural design effectively guides the high-speed airflow rising from the return duct 13, smoothly converting its kinetic energy into a horizontal flow aligned with the outlet duct 11. This avoids airflow turbulence, improves circulation efficiency, and ensures long-term stable operation of the air curtain door.

[0034] The stratified air outlet assembly 2 is the core functional component of this air curtain door and is installed in the air outlet duct 11. This assembly includes an air curtain unit 21, which can continuously and smoothly change the air supply speed and air volume through stepless speed adjustment. Unlike traditional fixed-speed air curtain units, the air curtain unit 21 can automatically adjust the wind speed based on actual operating conditions such as door area temperature, airflow conditions, and personnel flow, ensuring that the air curtain is always in optimal working condition, achieving both efficient heat and cold insulation and reducing energy consumption. An air outlet splint is installed at one end of the air outlet duct 11 and is maintained at the same level as the air curtain unit 21 to ensure stratification and uniform distribution of airflow.

[0035] At the same time, the wind curtain machine 21 is set to blow from left to right, and the airflow can cover the vertical height of the door opening in its entirety, forming a complete air barrier and reducing the problem of weak airflow in the middle caused by the large door height. At the same time, this solution uses the return duct 13 and the buffer chamber and the horizontal circulation of the guide plate to shorten the airflow path, reduce energy loss, increase the recycling rate, and reduce indoor air disturbance. In summary, compared with the existing top-down blowing structure, this solution sets a wind curtain door structure that blows horizontally from left to right, combined with efficient circulation return and intelligent layered control, which can not only form a more uniform and stable air barrier, effectively block the convection of cold and hot air, and enhance the isolation and energy-saving effects of the door area, but also is more adaptable to high door bodies and lateral wind pressure environments, is more convenient to install and maintain, has less interference with pedestrian flow lines, and has stronger intelligent adaptability, which improves the environmental adaptability and usage experience of the wind curtain door as a whole.

[0036] The air conduction assembly 3, installed within the air duct 12, is primarily responsible for recovering and reusing the cold air below the cold storage door. An air inlet plate is mounted at one end of the duct, and multiple temperature sensors are evenly embedded on its inner wall. These sensors monitor the temperature distribution of the airflow above and below the door in real time, feeding this data back to the control system to drive the stratification mechanism and achieve intelligent dynamic adjustment of the interface between the hot and cold airflow layers.

[0037] Through stepless speed regulation and a multi-channel circulation design, intelligent stratification, efficient isolation, and closed-loop energy recovery of hot and cold air in the door area are achieved. When the air curtain door is operating, the air curtain unit 21 automatically adjusts the air supply speed based on sensor signals. The stratified air outlet assembly 2 and the air outlet duct 11 work together to form an upper high-speed hot air curtain, effectively blocking the upward flow of external hot air. The lower layer of cold air is structured and guided to the conductive air outlet assembly 3. The cold air is recovered within the multi-stage heat conduction and heat exchange structure, forming a closed-loop flow through the air guide duct 12 and the return duct 13, further improving the utilization rate of cold air and reducing the energy consumption of the cold storage.

[0038] Through intelligent stratification and infinitely variable wind speed adjustment, the system adapts to changes in hot and cold airflow in the door area in real time, maintaining the air curtain's efficient insulation. Furthermore, its multi-channel circulation and energy recovery structure minimizes cold loss, significantly reducing cold storage energy consumption while ensuring dryness and condensation-proofing the door area. The compact overall structure and high degree of automation not only improve the energy efficiency of cold storage or constant temperature spaces, but also enhance the sealing and protective capabilities of the door.

[0039] The layered air outlet assembly 2 also includes a pair of first adjustment bases 22 fixedly connected to the bottom end of the air outlet duct 11. A plurality of pairs of evenly cross-distributed first adjustment rods 23 are provided on the top of the first adjustment base 22. A pair of first adjustment rods 23 are rotatably connected by a rotating rod 24, and multiple pairs of first adjustment rods 23 are rotatably connected to each other near one end by a rotating rod.

[0040] A slide groove is provided on the first adjustment base 22 , and a pair of first adjustment rods 23 close to the first adjustment base 22 are slidably connected to the slide groove, and a pair of first adjustment rods 23 away from the first adjustment base 22 are slidably connected to the insulation plate 28 .

[0041] A first heat-conducting block 25 is fixedly connected to the bottom end of the air outlet duct 11 and located in the middle of a pair of first adjustment bases 22. A plurality of evenly 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 to the insulation board 28. The plurality of first elastic heat-conducting rods 26 are fixedly connected to a plurality of heat-conducting strips 27 near one end of each other.

[0042] A first electric push rod 29 is fixedly connected to the top end of the first heat conducting block 25 , and an output end of the first electric push rod 29 is connected to the bottom end of the heat preservation plate 28 .

[0043] The air conduction assembly 3 includes a second heat conducting block 31 , which is mounted at the bottom of the air duct 12 . Second adjustment bases 32 are provided at both ends of the second heat conducting block 31 , which are mounted at the bottom of the air duct 12 .

[0044] A plurality of pairs of evenly distributed second adjustment rods 33 are provided on the top of the second adjustment base 32 , a pair of second adjustment rods 33 are rotatably connected via a positioning rod, and a plurality of pairs of second adjustment rods 33 are rotatably connected via a limiting rod close to one end.

[0045] A plurality of evenly distributed second elastic heat-conducting rods 35 are fixedly connected to the top of the second heat-conducting block 31, and a heat-insulating partition plate 39 is installed on the top of the plurality of second elastic heat-conducting rods 35. A second electric push rod 34 is fixedly connected to the top of the second heat-conducting block 31, and the output end of the second electric push rod 34 is connected to the bottom end of the heat-insulating partition plate 39. A plurality of evenly distributed heat-conducting absorption blocks 36 are installed on the outer periphery of the second elastic heat-conducting rod 35. An elastic heat-conducting block 37 is fixedly connected to the outer periphery of the heat-conducting absorption block 36, and a heat-conducting absorption fin 38 is fixedly connected to one end of the elastic heat-conducting block 37.

[0046] A pair of second adjustment rods 33 close to the second heat-conducting block 31 are slidably connected to the second adjustment base 32, and a pair of second adjustment rods 33 away from the second heat-conducting block 31 are slidably connected to the insulation partition plate 39. One end of the second heat-conducting block 31 is fixedly connected to a plurality of evenly distributed conduction rods 30, and a thermal insulation cover is installed around the plurality of conduction rods 30, and the plurality of conduction rods 30 are all connected to the first heat-conducting block 25.

[0047] A plurality of evenly distributed guide plates 40 are installed on the inner wall of the air guide duct 12 and on the upper side of the air conduction and outlet assembly 3 , and a flow groove is opened on the heat-insulating partition plate 39 .

[0048] 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. This enables intelligent sensing, dynamic separation, energy recovery, and wind speed and temperature optimization of air stratification at the cold storage door. The specific principles and beneficial effects are as follows:

[0049] A plurality of temperature sensors are set at key positions of the door area. These sensors can collect the temperature data of the air intake at each layer above and below the door in real time, and feed back the information to the first electric push rod 29 and the second electric push rod 34. At the bottom end of the air outlet duct 11, a pair of first adjustment bases 22 are fixed, and multiple pairs of evenly crossed first adjustment rods 23 are arranged on the top. Through the flexible rotation and sliding of the rotating rod 24 and the base slide, highly synchronized and wide-range mechanical adjustment is achieved. This system drives the insulation plate 28 to achieve precise lifting and lowering, so that it can be automatically positioned at the most appropriate layering height according to the sensor data, and the second heat conduction block 31, the second adjustment base 32, the second adjustment rod 33, the positioning rod, the limit rod and the second electric push rod 34 in the air outlet component 3 are similarly driven to dynamically adjust the insulation partition plate 39 to achieve stratification of the hot and cold air blown inside the air outlet duct 11, and similarly, the stratification of the hot and cold air received by the air guide duct 12.

[0050] Because the height of the hot and cold boundary at the cold storage door changes all the time due to conditions such as the outside temperature, the temperature inside the storage, the frequency of door opening, and the ambient wind pressure, real-time perception and automatic adjustment can always ensure that the stratified interface is exactly at the actual intersection of the cold and hot air flows, minimizing the convection and mixing of hot and cold air, improving the cold and heat insulation effect of the door, reducing energy consumption, and improving the economy and reliability of the cold storage operation.

[0051] The layered air outlet assembly 2 and the conductive air outlet assembly 3 form independently controllable air flow channels in the upper and lower layers according to the position of the insulation board 28 through the above-mentioned adjustment mechanism.

[0052] Upper channel: It is mainly used to transport room temperature air to form a strong air barrier air curtain to intercept the external hot air from floating up and invading 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 dry. At the same time, high wind speed can effectively offset the natural upward trend of hot air and further consolidate the heat barrier effect.

[0053] Lower channel: The lower channel is not designed to actively transport cold air directly outward, but to guide the lost cold air to the position of the conduction outlet component 3 based on the natural loss of cold air below the cold storage door.

[0054] Here, the cold air passes through the heat-conducting absorption block 36, the elastic heat-conducting block 37, the heat-conducting absorption fin 38 and other structures, and fully exchanges heat with the heat exchange system in the conductive air outlet component 3, so that this part of the cold air that was originally going to be lost is efficiently recovered and transferred to the stratified air outlet component 2 and the lower side of the air curtain machine 21 through the heat-conducting closed loop. In this way, the wind blowing from the lower side of the air curtain machine 21 to the stratified air outlet component 2 is cooled, and finally a cold air curtain with a lower temperature is formed, which effectively protects the cold capacity of the lower port of the cold storage, reduces energy consumption, and realizes energy recycling.

[0055] Because the loss of cold air under the door is the biggest hidden danger to the energy consumption of the cold storage, a special cold air curtain is set up, and a heat conduction and heat exchange structure is integrated in the air flow path. This can capture and recover the lost cold air to the maximum extent, reduce the burden on the cold storage, and achieve high efficiency and energy saving.

[0056] Through the multi-stage heat-conducting structure including the first heat-conducting block 25, the first elastic heat-conducting rod 26, the heat-conducting strip 27, the second heat-conducting block 31, the second elastic heat-conducting rod 35, the heat-conducting absorption block 36, the elastic heat-conducting block 37, and the heat-conducting absorption fin 38, a set of efficient cold recovery and transfer closed loop is built.

[0057] When the lower layer of cold air passes through the absorption structure, its cold energy is captured by the heat-conducting absorption block 36 and the heat-conducting absorption fins 38, and the heat exchange efficiency is further improved through the vibration of the elastic heat-conducting block 37.

[0058] The recovered cold energy is transferred back to the first heat conducting block 25 in a closed loop via the conduction rod 30, and is used to reduce the heat of the air blown out from the lower side of the air curtain 21, thereby forming a cold energy recycling and effectively reducing the overall energy consumption of the cold storage.

[0059] The micro-vibration of the heat-conducting absorption fins 38, if triggered by personnel or airflow disturbance, can further break the airflow boundary layer, enhance the heat exchange effect, and improve the cold recovery rate.

[0060] At the upper layer of the cold storage door, the insulation partition plate 39 and the guide plate 40 work together to optimize the air flow into a high-speed airflow close to room temperature. The core reason for using room temperature air as the upper air curtain is that the temperature difference between it and the external hot air is small, and it is not easy to produce condensation, which effectively prevents the door area from condensing and frosting due to the intersection of cold and hot air; at the same time, the high-speed air curtain can form a strong kinetic energy barrier, blocking the floating and penetration of external hot air, and improving the thermal insulation effect of the cold storage door area.

[0061] The higher the wind speed, the stronger the physical barrier effect of the air curtain, and the more difficult it is for external hot air to penetrate the air curtain and enter the cold storage, thereby significantly reducing the energy consumption of the cold storage.

[0062] It should be further explained that in the air duct 12, the air blown in from the lower side first passes through the air outlet component 3. At this time, the airflow has absorbed a large amount of cold energy naturally lost from the cold storage. Subsequently, this part of the cooled air enters the upper side of the air duct 12 through the circulation groove opened on the insulation partition plate 39.

[0063] After absorbing the cold air from the conductive outlet assembly 3, the lower air enters the upper side of the air duct 12, guided by the flow slots provided in the thermally insulated partition plate 39. The design of the flow slots not only provides an upward path for the airflow, but also, due to the cross-sectional area contraction effect, further increases the airflow velocity and enhances the kinetic energy of the airflow. Simultaneously, the existing air in the upper side of the air duct 12, primarily hot air at or slightly above room temperature, is also orderly organized into an upward flow, guided by the upper guide plate 40.

[0064] In this way, the airflow from the lower side, which has been cooled and recovered, converges with the hot air from the upper side in the area above the air guide duct 12. The two airflows merge to form a more concentrated, high-speed rising airflow. This high-speed airflow mainly flows upward along the upper side of the air guide duct 12. Finally, this part of the high-speed rising airflow is discharged through the return duct 13. Under the guidance of the buffer chamber and the curved deflector, it continues to maintain its flow potential energy, thereby enhancing the overall wind speed and thermal insulation effect of the air curtain above the air outlet duct 11.

[0065] In this way, the air curtain above the door always maintains a high wind speed and high kinetic energy state, minimizing the intrusion of hot air and the loss of cold air, and achieving efficient energy saving and environmental safety of the door system.

[0066] The continuity and strength of the upper air curtain are enhanced. The cold air on the lower side does not lose directly after the cold air is recovered, but is recycled together with the hot air by rising, reducing the net loss of cold storage cooling capacity.

[0067] The confluence of the upper hot air and the lower rising air flow enhances the wind speed and kinetic energy of the air curtain, maximizing the isolation of external hot air from rising.

[0068] The overall airflow is closed-loop circulated, 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, thus improving the energy saving and anti-condensation performance of the entire door system.

[0069] Working principle:

[0070] An air outlet duct 11, an air guide duct 12 and a return duct 13 are provided on the main frame 1 of the air curtain door. The stratified air outlet component 2 cooperates with the conductive air outlet component 3 to realize intelligent stratification and efficient circulation of the air in the cold storage door area. The cold air lost below the cold storage door is guided into the conductive air outlet component 3 and the cold air is recovered through a multi-stage heat exchange structure including a second heat conducting block 31, a second elastic heat conducting rod 35, a heat conducting absorption block 36, an elastic heat conducting block 37 and a heat conducting absorption fin 38. The recovered cold air is connected to the first heat conducting block 25 through the conductive rod 30 and fed back to the stratified air outlet component 2 and the lower side of the air curtain machine 21, so that the lower air curtain forms a cold air barrier with a lower temperature, effectively guarding the cold air at the lower port of the door and reducing energy consumption.

[0071] The air stratification height above and below the doorway is monitored in real time by temperature sensors. The first and second electric actuators 29 and 34 drive the insulation panels 28 and insulation divider 39 to automatically adjust, flexibly separating the hot and cold airflows and ensuring the optimal interface between the stratification layers. The upper channel primarily carries room-temperature air. The deflector 40 and the flow slots on the insulation divider 39 accelerate and orderly raise the airflow, forming a high-speed, high-energy hot air curtain that effectively blocks the upward infiltration of external hot air. The lower airflow, which has undergone cold recovery and cooling, converges with the upper hot air at the upper side of the air guide duct 12, forming a high-speed upward airflow. This airflow is guided by the return duct 13, the buffer chamber, and the curved deflector, and efficiently circulates back to the upper side of the system, further enhancing the air curtain's wind speed and thermal barrier effectiveness. Through multi-point active sensing, mechanical dynamic stratification, closed-loop cold recovery, and high-speed air curtain optimization, the entire system achieves intelligent separation of hot and cold airflow at the cold storage doorway, maximizing cold recovery and recycling, significantly improving energy efficiency, thermal insulation, condensation prevention, and environmental safety.

[0072] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0073] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. Infinitely variable speed circulating air curtain door, characterized by: include: An air curtain door main frame (1), wherein an air outlet duct (11), an air guide duct (12) and a return duct (13) are installed on the air curtain door main frame (1), both ends of the return duct (13) are respectively connected to the air outlet duct (11) and the air guide duct (12), an electric night curtain (14) is installed at one end of the return duct (13), a buffer chamber is provided at the connection point between the air outlet duct (11) and the return duct (13), and a curved guide plate is installed in the buffer chamber; A layered air outlet component (2), the layered air outlet component (2) being installed in the air outlet duct (11), the layered air outlet component (2) comprising an air curtain machine (21), the air curtain machine (21) being arranged in the air outlet duct (11), an air outlet splint being installed at one end of the air outlet duct (11), the air outlet splint and the air curtain machine (21) being arranged on the same horizontal line; An air conduction outlet component (3), the air conduction outlet component (3) being installed in an air guide duct (12), an air inlet splint being installed at one end of the air guide duct (12), and a plurality of evenly distributed temperature sensors being inlaid on the inner wall of the air inlet splint; The layered air outlet assembly (2) further comprises a pair of first adjustment bases (22) fixedly connected to the bottom end of the air outlet duct (11); a plurality of pairs of evenly cross-distributed first adjustment rods (23) are provided on the top end of the first adjustment base (22); a pair of the first adjustment rods (23) are rotationally connected via a rotating rod (24); a plurality of pairs of the first adjustment rods (23) are rotationally connected to each other at one end via the rotating rod; a slide groove is provided on the first adjustment base (22); a pair of the first adjustment rods (23) close to the first adjustment base (22) are slidably connected to the slide groove; a pair of the first adjustment rods (23) away from the first adjustment base (22) are slidably connected to the insulation plate (28).

2. The stepless speed-changing circulating air curtain door according to claim 1, characterized in that: A first heat-conducting block (25) is fixedly connected to the bottom end of the air outlet duct (11) and located in the middle of a pair of first adjustment bases (22); a plurality of evenly 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 to the insulation board (28); and a plurality of heat-conducting strips (27) are fixedly connected to one end of the plurality of first elastic heat-conducting rods (26) close to each other.

3. The stepless speed-changing circulating air curtain door according to claim 2, characterized in that: A first electric push rod (29) is fixedly connected to the top end of the first heat-conducting block (25), and an output end of the first electric push rod (29) is connected to the bottom end of the insulation plate (28).

4. The stepless speed-changing circulating air curtain door according to claim 1, characterized in that: The conduction air outlet assembly (3) comprises a second heat conducting block (31), the second heat conducting block (31) is mounted at the bottom end of the air guide duct (12), and second adjustment bases (32) are provided at both ends of the second heat conducting block (31), the second adjustment bases (32) are mounted at the bottom end of the air guide duct (12).

5. The stepless speed-changing circulating air curtain door according to claim 4, characterized in that: A plurality of pairs of evenly distributed second adjustment rods (33) are provided at the top of the second adjustment base (32), one pair of the second adjustment rods (33) is rotatably connected via a positioning rod, and a plurality of pairs of the second adjustment rods (33) are rotatably connected at one end thereof close to each other via a limiting rod.

6. The stepless speed-changing circulating air curtain door according to claim 5, characterized in that: The top of the second heat-conducting block (31) is fixedly connected to a plurality of evenly distributed second elastic heat-conducting rods (35), and the tops of the plurality of second elastic heat-conducting rods (35) are installed with a heat-insulating partition plate (39). The top of the second heat-conducting block (31) is fixedly connected to a second electric push rod (34), and the output end of the second electric push rod (34) is connected to the bottom end of the heat-insulating partition plate (39). The second elastic heat-conducting rod (35) is surrounded by a plurality of evenly distributed heat-conducting absorption blocks (36), and the heat-conducting absorption block (36) is fixedly connected to an elastic heat-conducting block (37) on the outside, and one end of the elastic heat-conducting block (37) is fixedly connected to a heat-conducting absorption fin (38).

7. The stepless speed-changing circulating air curtain door according to claim 6, characterized in that: A pair of the second adjustment rods (33) close to the second heat-conducting block (31) are slidably connected to the second adjustment base (32), and a pair of the second adjustment rods (33) away from the second heat-conducting block (31) are slidably connected to the heat-insulating partition plate (39). One end of the second heat-conducting block (31) is fixedly connected to a plurality of evenly distributed conduction rods (30), and a heat-insulating sleeve is installed around the plurality of conduction rods (30), and the plurality of conduction rods (30) are all connected to the first heat-conducting block (25).

8. The stepless speed-changing circulating air curtain door according to claim 7, characterized in that: A plurality of evenly distributed guide plates (40) are installed on the inner wall of the air guide duct (12) and on the upper side of the air conduction outlet assembly (3), and a flow slot is provided on the heat-insulating partition plate (39).

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