Ultra-low temperature air supply device based on cascade utilization of cold energy

Abstract

This patent provides an ultra-low temperature air supply device based on the cascade utilization of cold energy. The device is mainly composed of a nozzle, a fresh air return system, a mixing duct, and auxiliary accessories. The duct outlet adopts a swirl air outlet to supply air, and the required cooling capacity is obtained from the cold energy of the low-temperature substance collected by the phase change material (PCM). Under ultra-low temperature air supply conditions, the device can achieve the maximum possible mixing of the cold air output by the nozzle with the outdoor fresh air and indoor return air to achieve the appropriate air supply temperature, ensure indoor thermal comfort, and achieve the goals of energy conservation, environmental protection, and efficient energy utilization.

Description

Technical Field

[0001] This patent belongs to the field of cold energy cascade utilization and ultra-low temperature air supply technology, specifically an ultra-low temperature air supply device based on cold energy cascade utilization. Background Art

[0002] As global energy demand and environmental pressures increase, efficient energy utilization, energy conservation and emission reduction, and ecological environmental protection have become hot topics, and more and more clean and environmentally friendly energy or materials are widely used in human production and life.

[0003] Among them, a large part of clean and environmentally friendly energy or materials are usually converted into liquid during storage and transportation, such as LNG, liquid hydrogen, liquid oxygen, liquid nitrogen, etc. These substances have extremely low temperatures when in liquid form and will release a large amount of cold energy when used. This cold energy can be widely used in production and life fields such as power generation and refrigeration. Sometimes this cold energy is directly discharged into the atmosphere or seawater, resulting in huge energy waste.

[0004] In the HVAC sector, ultra-low-temperature air supply is gradually becoming a popular air supply method. Ultra-low-temperature air supply offers the advantages of low operating costs, low system equipment costs, high thermal comfort, and energy savings. Applying the cold energy of these clean and environmentally friendly energy sources or materials to ultra-low-temperature air supply maximizes energy utilization while addressing key technical challenges in the air conditioning industry, such as high energy consumption, high costs, and low thermal comfort. Summary of the Invention

[0005] The purpose of this patent is to provide an ultra-low temperature air supply device based on the cascade utilization of cold energy.

[0006] The purpose of this patent is mainly achieved through the following technical route: an ultra-low temperature air supply device based on the cascade utilization of cold energy. By utilizing the cryogenic substance and the phase change material (PCM) for heat exchange, most of the cold energy of the cryogenic substance is absorbed by the phase change material (PCM), and the phase change material (PCM) and the refrigerant are subjected to multi-stage heat exchange, and finally the air is used to exchange heat with the refrigerant to obtain cold air of 2°C to 5°C, and the air is blown into the device through a nozzle to achieve ultra-low temperature air supply. In order to achieve the gradual and slow release of cold energy, the control system can be used to adjust the valves of the device for inputting the cryogenic substance and the heat exchanger to control the flow rate of the cryogenic substance, the phase change material (PCM), and the refrigerant, as well as the time for their contact and heat exchange, so as to achieve the purpose of the gradual and slow release of cold energy. The phase change material (PCM) mainly includes crystalline hydrated salts, molten salts, metals, alloys, paraffin wax, fatty acids, some higher aliphatic hydrocarbons, alcohols, carboxylic acids, etc.

[0007] After the cold energy of the low-temperature substance is absorbed by the phase change material (PCM), it can be further invested in industrial production, residents' lives, medical care, scientific research and other fields, so that the other energy contained in the substance can be used for power generation, refrigeration, heating and other energy supply links, or it can be used for oxygen supply, flame retardancy and other purposes.

[0008] The ultra-low-temperature air supply device, based on cascaded cold energy utilization, includes a nozzle, a primary mixing air duct, a secondary mixing air duct, an energy storage air duct, a fresh air duct, a return air duct, a pressurized blower, a pressure transmitter, an infrared drying lamp, an ultraviolet sterilization lamp, a swirl air outlet, and a drainage device. The device can be divided into three functional sections: a fresh air mixing section, an energy storage section, and a return air mixing section. It can simultaneously achieve four operating states: fresh air, full return air, a mixture of fresh and return air, and a mixture of fresh and return air and cold air.

[0009] The nozzle blows high-speed cold air into the primary mixing duct, and the nozzle is connected to the primary mixing duct via a variable diameter air duct I. The exterior of the nozzle is coated with an insulation layer, which can be made of insulating materials such as glass wool, rock wool, and rubber-plastic insulation wool. The fresh air mixing section consists of the primary mixing duct and the fresh air duct. The amount of cold air infiltrating can be controlled by an electric air valve installed on the nozzle. The primary mixing duct is nested with the fresh air duct, and is provided with evenly distributed air holes. Outdoor fresh air flowing in through the fresh air duct is induced to infiltrate the primary mixing duct through the air holes, where it is evenly mixed with the high-speed cold air blown in from the nozzle, causing the cold air to heat up. The amount of fresh air infiltrating can be controlled by an electric air valve or a fresh air blower installed on the fresh air inlet pipe. Some outdoor fresh air temporarily remaining in the fresh air casing can also exchange heat with the cold air in the pipe through the pipe wall. The energy storage section consists of the energy storage duct. The energy storage air duct is installed between the primary mixing air duct and the secondary mixing air duct or between the nozzle and the primary mixing air duct. The specific installation position can be determined according to the actual situation. The pipe wall is composed of three layers of materials. The inner pipe wall is made of materials with good thermal conductivity. The outer pipe wall can be made of ordinary thin steel plates, galvanized steel plates, stainless steel, aluminum plates, plastic composite steel plates, polyvinyl chloride plastic plates and fiberglass. Phase change material (PCM) is filled in the interlayer between the inner pipe wall and the outer pipe wall. The energy storage air duct is coated with an insulation layer on the outside. The insulation layer can be made of insulation materials such as glass wool, rock wool, and rubber-plastic insulation wool. The energy storage air duct is mainly used to absorb the cold energy of the cold air, promote the rapid temperature rise of the cold air, reach the required air supply temperature as soon as possible, and accumulate the absorbed cold energy, and then continue to put it into the device for reuse, thereby making full use of the cold energy. The return air mixing section is composed of the secondary mixing air duct and the return air duct. The secondary mixing duct is connected to the primary mixing duct via a variable-diameter duct II, nested within the return air duct. The duct is also equipped with evenly distributed air holes. Indoor return air flowing in through the return air duct is induced through the holes into the secondary mixing duct, where it mixes with the cold air already fully mixed with fresh air in the primary mixing duct. This reheats the cold air to a supply air temperature of 16°C to 18°C, maintaining a supply air temperature differential of 6°C to 10°C. Some indoor return air temporarily remaining in the return air casing can also exchange heat with the cold air within the duct through the duct wall. The return air volume is regulated by the control system, which controls the electric damper on the return air inlet duct.

[0010] The fresh air duct includes a fresh air input pipe, a fresh air casing and an electric air valve. The fresh air input pipe mainly receives outdoor fresh air from the fresh air fan, and the fresh air casing is nested with the primary mixing air duct. The outside of the fresh air duct is coated with an insulation layer, and the insulation layer can use insulation materials such as glass wool, rock wool, rubber and plastic insulation wool. The return air duct includes a return air input pipe, a return air casing and an electric air valve. The return air input pipe mainly receives indoor return air from the return air outlet, and the return air casing is nested with the secondary mixing air duct. The electric air valve is mainly used to adjust the amount of fresh and return air.

[0011] In the fresh air working state, only the fresh air system is started; in the full return air working state, only the return air system is started; in the fresh return air mixed working state, the fresh air system and the return air system are started at the same time; in the fresh return air and cold air mixed working state, the fresh air system, return air system, and cold source should run at the same time. This working state is the most commonly used working state.

[0012] The pressurizing fans are respectively arranged at the end of the primary mixing air duct and the secondary mixing air duct. When the air supply pressure in the primary mixing air duct and the secondary mixing air duct is insufficient, the pressurizing fans start pressurizing according to the instructions of the control system, so that the cold air in the air duct can be normally delivered into the room, ensuring the normal operation of the device.

[0013] The pressure transmitter is respectively provided in the primary mixing air duct and the secondary mixing air duct, and is connected to the control system. When the pressure transmitter detects that the air supply pressure in the primary mixing air duct or the secondary mixing air duct is insufficient, it sends a signal to the control system. After receiving the signal, the control system automatically turns on the pressurizing fan and can control the speed of the pressurizing fan according to the pressure in the air duct.

[0014] The infrared drying lamp and ultraviolet sterilization lamp are respectively installed in the primary mixing air duct and the secondary mixing air duct. The two lamps are fixed to the top of the air duct with fasteners at both ends of the lamp holder. The infrared drying lamp is mainly used to dry out residual condensed water to keep the air duct dry. The ultraviolet sterilization lamp is mainly used to kill mold that grows in the air duct due to moisture caused by condensed water.

[0015] The swirl air outlet is installed at the very end of the entire device, and the cold air that has been fully mixed with the fresh air and the return air is sent into the room in the form of a swirl, so that the cold air sent into the room can be fully mixed with the indoor air again to ensure that the cooling capacity obtained in various parts of the room is uniform.

[0016] The drainage device, comprising a water collection tray and a drain pipe, is primarily used to promptly collect and drain the large amount of condensed water generated by the heat exchange between hot and cold air, ensuring that water does not accumulate in the air ducts. The water collection tray is located at the bottom of the primary and secondary mixing air ducts and is connected to the drain pipe. The drainage device is removable for easy cleaning and maintenance.

[0017] Waterproof measures should be taken for the primary mixing air duct, secondary mixing air duct, energy storage air duct, variable diameter air duct I, variable diameter air duct II, drainage device, pressurized fan, infrared drying lamp, ultraviolet sterilization lamp, swirl air outlet and elbow.

[0018] The control system is the core of the entire device. Based on settings and feedback, it determines its operating status, activates relevant equipment, and adjusts its operating status. Thermocouples should be installed indoors to monitor the indoor temperature and provide feedback to the control system through these thermocouples. Based on this feedback, the control system controls the fresh air system, return air system, and cooling source, adjusting the mixing ratio of cold air to fresh air and return air to maintain the desired indoor conditions.

[0019] Compared with the prior art, the beneficial effects of this patent are:

[0020] (1) This patent uses the cold energy of cryogenic materials as a cold source, effectively recovering and utilizing the cold energy of cryogenic materials, and allowing these materials to continue to be used in industrial production, residents' lives and other fields. Its cold energy recovery efficiency can reach about 50% to 80%, maximizing the utilization of all the energy contained in cryogenic materials and achieving the goal of efficient energy utilization.

[0021] (2) The device described in this patent can make the cold air mixed with the fresh air and the return air more evenly, which can better meet the requirements of indoor air supply, enhance the indoor thermal comfort, and improve the user experience.

[0022] (3) The device described in this patent integrates three types of equipment: fresh air, return air, and supply air, making the device more integrated, reducing the space occupied by the device, and at the same time reducing the cost by 10% to 15% compared with conventional air conditioners.

[0023] (4) This patent adopts an ultra-low temperature air supply method, which reduces the annual operating costs by about 20% compared with conventional air conditioners, and can achieve energy conservation, emission reduction, and green and low-carbon development.

[0024] (5) This patent uses non-toxic or low-toxic substances as energy storage and cooling media, which do not cause significant harm to the environment and human body, thus protecting the environment and the health of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a flow chart of the ultra-low temperature air supply method based on the cascade utilization of cold energy in this patent;

[0026] Figure 2 This is a schematic diagram of the ultra-low temperature air supply device based on the cascade utilization of cold energy in this patent;

[0027] Figure 3a This is a schematic diagram of the ultra-low temperature air supply device based on the cascade utilization of cold energy in this patent, where the energy storage air duct is located between the primary mixing air duct and the secondary mixing air duct;

[0028] Figure 3b This is a schematic diagram of the ultra-low temperature air supply device based on the cascade utilization of cold energy in this patent, where the energy storage air duct is located between the nozzle and the primary mixing air duct;

[0029] Figure 4a This is a cross-sectional view of the ultra-low temperature air supply device based on the cascade utilization of cold energy in this patent, where the energy storage air duct is located between the primary mixing air duct and the secondary mixing air duct;

[0030] Figure 4b This is a cross-sectional view of the ultra-low temperature air supply device based on the cascade utilization of cold energy in this patent, where the energy storage air duct is located between the nozzle and the primary mixing air duct;

[0031] Figure 5 This is a partial cross-sectional view of the primary mixing air duct of the ultra-low temperature air supply device based on the cascade utilization of cold energy in this patent;

[0032] Figure 6 This is a partial cross-sectional view of the secondary mixing air duct of the ultra-low temperature air supply device based on the cascade utilization of cold energy in this patent;

[0033] Figure 7 This is a partial cross-sectional view of the energy storage air duct of the ultra-low temperature air supply device based on the cascade utilization of cold energy in this patent;

[0034] Figure 8 This is a partial cross-sectional view of the electric air valve of the ultra-low temperature air supply device based on the cascade utilization of cold energy in this patent;

[0035] Figure 9 This is a schematic diagram of the electric air valve of the ultra-low temperature air supply device based on the cascade utilization of cold energy in this patent.

[0036] In the picture:

[0037] 1. Nozzle 2. Variable diameter air duct I 3. Primary mixing air duct

[0038] 4. Fresh air inlet pipe 5. Fresh air casing 6. Variable diameter air duct II

[0039] 7. Energy storage air duct 8. Secondary mixing air duct 9. Return air input pipe

[0040] 10. Return air casing 11. Elbow 12. Swirl air outlet

[0041] 13. Drain pipe 14. Water tray 15. Pressurized fan

[0042] 16. Infrared drying lamp 17. Ultraviolet sterilization lamp 18. Pressure transmitter

[0043] 19. Electric damper 20. Damper controller 21. Manual damper switch

[0044] 22. Air valve linkage mechanism 23. Air valve shutter 24. Inner pipe wall

[0045] 25. Outer tube wall 26. Interlayer 27. Air hole

[0046] 28. Control system 29. Cold source 30. Fresh air system

[0047] 31. Return air system 32. Thermocouple 33. Power supply DETAILED DESCRIPTION

[0048] In conjunction with the accompanying drawings, the ultra-low temperature air supply device based on the cascade utilization of cold energy of this patent is illustrated and the specific implementation method of this patent is described, but this patent is not limited to this implementation method.

[0049] like Figure 1 As shown, this is a flow chart of the ultra-low temperature air supply method based on the cascade utilization of cold energy of this patent. The technical solution adopted is to provide an ultra-low temperature air supply method based on the cascade utilization of cold energy. The low temperature material used in this method is LNG. The LNG is heat exchanged with the phase change material (PCM) through the first stage heat exchanger, so that most of the cold energy of the LNG is absorbed by the phase change material (PCM). The phase change material (PCM) is heat exchanged with water through the second stage heat exchanger to make ice. The cold energy of the ice is transferred to the water through the refrigerant ethylene glycol to form low temperature water. Finally, the low temperature water in the third stage heat exchanger is heat exchanged with the air to form cold air of 2℃~5℃, so as to realize ultra-low temperature air supply. In the process of the above-mentioned step-by-step transmission of cold energy, the LNG conveying device and the valves of the heat exchangers at each stage should be controlled by the control system (28), so that the flow rate and heat exchange time of LNG, water and ethylene glycol can be controlled and adjusted, thereby realizing the process of slow release of cold energy step by step.

[0050] like Figures 2 to 9 As shown in the figure, it is a schematic diagram and a cross-sectional view of the ultra-low temperature air supply device based on the cascade utilization of cold energy of this patent. The technical solution adopted is to provide an ultra-low temperature air supply device based on the cascade utilization of cold energy. The device uses Figure 1 The cooling energy supply method shown in the figure transfers a large amount of cooling energy obtained from LNG to the cooling air in the nozzle (1). The primary mixing air duct (3) is connected to the nozzle (1) by a variable diameter air duct I (2). An electric air valve (19) is installed on the nozzle (1) to control the amount of cooling air input.

[0051] The primary mixing air duct (3) and the fresh air casing (5) are nested with each other, and there is a certain gap between the two. The length of the gap should be determined according to the length of the primary mixing air duct (3), and the length is required to enable all the air holes (27) on the primary mixing air duct (3) to be completely inserted into the fresh air casing (5). A fresh air input pipe (4) is connected to the middle position of the fresh air casing (5). The fresh air input pipe (4) conveys outdoor fresh air from the fresh air blower into the fresh air casing (5). An electric air valve (19) is installed on the fresh air input pipe (4) to control the amount of fresh air input. In the upper part of the primary mixing air duct (3), with the center of the circle where the primary mixing air duct (3) is located as a reference, an air hole (27) is opened every 30 degrees, that is, six air holes (27) should be opened within a 180-degree circumference angle of the upper part of the air duct, and the air holes (27) are opened uniformly in sequence along the height direction of the primary mixing air duct (3) at a certain distance. The diameter of the air hole (27) should be determined according to the diameter of the primary mixing air duct (3), and the diameter of the air hole (27) should be kept moderate. A pressurizing fan (15) and a pressure transmitter (18) are set at the tail of the primary mixing air duct (3). The pressure transmitter (18) is connected to a control system (28) and controls the opening and closing and speed of the pressurizing fan (15) by monitoring the pressure in the primary mixing air duct (3). An infrared drying lamp (16) and an ultraviolet sterilization lamp (17) are installed at the top of the primary mixing air duct (3) between the two air holes (27) using fasteners. A semicircular detachable water receiving tray (14) is installed at the bottom of the primary mixing air duct (3). The water receiving tray (14) is provided with a drain port connected to an external drain pipe (13).

[0052] The secondary mixing air duct (8) and the return air casing (10) are nested with each other, and there is a certain gap between the two. The length of the gap should be determined according to the length of the secondary mixing air duct (8), and the length is required to be able to fit all the air holes (27) on the secondary mixing air duct (8) into the return air casing (10). An electric air valve (19) is installed on the return air input pipe (9) to control the size of the input return air volume. The diameter of the secondary mixing air duct (8) should be slightly larger than that of the primary mixing air duct (3), and a diameter change should be made between the two. The air duct II (6) is connected. Similar to the primary mixing air duct (3), a wind hole (27) is opened every 30 degrees based on the center of the circle where the secondary mixing air duct (8) is located. That is, six wind holes (27) should be opened within a 180-degree circumference angle of the upper half of the air duct, and the wind holes (27) are opened uniformly in sequence along the height direction of the secondary mixing air duct (8) at a certain distance. The diameter of the wind hole (27) should be determined according to the diameter of the secondary mixing air duct (8), and the diameter of the wind hole (27) should be kept moderate. A pressurizing fan (15) and a pressure transmitter (18) are set at the tail of the secondary mixing air duct (8). The pressure transmitter (18) is connected to the control system (28) and controls the opening and closing and speed of the pressurizing fan (15) by monitoring the pressure in the secondary mixing air duct (8). An infrared drying lamp (16) and an ultraviolet sterilization lamp (17) are installed at the top of the secondary mixing air duct (8) between two rows of air holes (27) using fasteners. A semicircular detachable water receiving tray (14) is installed at the bottom of the secondary mixing air duct (8). The energy storage air duct (7) includes an inner pipe wall (24) and an outer pipe wall (25), and an interlayer (26) located between the inner pipe wall (24) and the outer pipe wall (25), wherein a phase change material is provided in the interlayer (26).

[0053] The swirl vent (12) is located at the rear of the entire device and is connected to the secondary mixing air duct (8) via an elbow (11). The diameter of the swirl vent (12) and the diameter of the elbow (11) are consistent with the diameter of the secondary mixing air duct (8). The swirl vent (12) is connected to a control system (28) of the entire device. The control system (28) can adjust the operating state of the swirl vent (12) through information instructions input by a user.

[0054] The nozzle (1), fresh air sleeve (5), fresh air input pipe (4), and energy storage air pipe (7) are all coated with a thermal insulation layer to prevent leakage of cold and heat.

[0055] Waterproof measures should be taken for the primary mixing air duct (3), secondary mixing air duct (8), energy storage air duct (7), variable diameter air duct I (2), variable diameter air duct II (6), drainage device, pressurized fan (15), infrared drying lamp (16), ultraviolet sterilization lamp (17), swirl air outlet (12) and elbow (11) to prevent leakage of condensed water.

[0056] If the installation environment permits, an additional level of mixing air duct, i.e., a tertiary mixing air duct, can be added to allow the cold air in the duct to be fully mixed with the indoor return air again. The diameter of the tertiary mixing air duct is consistent with the diameter of the secondary mixing air duct (8).

[0057] When the device is started, the control system (28) can be used to select its working state and set the required indoor temperature and the required mixing ratio of fresh air, return air, and cold air. The control system (28) starts and adjusts the operating state of the corresponding equipment according to the input setting information. During the operation of the device, the control system (28) can also be used to adjust the relevant settings. The control system (28) will adjust the operating state of the corresponding equipment according to the changed setting information. Thermocouples (32) are arranged at multiple points in the room. The control system (28) controls the fresh air system (30), the return air system (31), and the cold source (29) according to the feedback information of the thermocouples (32), and automatically adjusts the mixing ratio of cold air, fresh air, and return air so that the indoor conditions are maintained at the set state.

[0058] The specific function of this patent is achieved as follows: Figure 1As shown, the phase change material (PCM) first fully obtains the cold energy of LNG through the heat exchanger, and then slowly releases the cold energy from LNG into the refrigerant such as water and ethylene glycol through the multi-stage heat exchanger step by step. Finally, the cold energy in the refrigerant is released into the air to form cold air of 2℃ to 5℃. As shown in the figure, when the device is started, it will first determine its working state according to the instructions of the control system (28), and start and adjust the required equipment according to different working states and setting information. When the device is in the fresh air working state, only the fresh air system (30) starts working, and the outdoor fresh air flows into the device through the fresh air pipe, and is blown into the room through the primary mixing air pipe (3), the energy storage air pipe (7), the secondary mixing air pipe (8), the elbow (11) and the swirl air outlet (12); when the device is in the full return air working state, only the return air system (31) starts working, and the indoor return air flows into the device through the return air pipe, and is blown into the room through the secondary mixing air pipe (8), the elbow (11) and the swirl air outlet (12). When the device is in the fresh return air mixing working state, the fresh air system (30) and the return air system (31) are started at the same time, and the outdoor fresh air and the indoor return air flow into the device through the fresh air duct and the return air duct respectively. The outdoor fresh air passes through the primary mixing air duct (3) and the energy storage air duct (7) and is fully mixed with the indoor return air in the secondary mixing air duct (8), and then is blown into the room through the elbow (11) and the swirl air duct (12); When the device is in the fresh return air cold air mixing working state, the fresh air system (30), the return air system (31), The cold source (29) is started at the same time, and the cold air obtained from the cold source (29) is blown into the air supply device at high speed through the nozzle (1). After entering the air supply device, the cold air first enters the primary mixing air duct (3), and is fully mixed with the outdoor fresh air infiltrated from the air hole (27), completing the first heating process, and then is blown into the energy storage air duct (7) through the pressurized fan (15). The phase change material (PCM) in the interlayer (26) exchanges heat with the cold air, completing the second heating process. The interlayer (26) The phase change material (PCM) in the air duct accumulates cold energy and releases cold energy into the pipe at the same time. It then flows into the secondary mixing air duct (8) and is fully mixed with the indoor return air that infiltrates from the air hole (27), completing the third heating process. It is blown into the elbow (11) through the pressure fan (15) and then sent into the room through the swirl air outlet (12). The characteristics of the swirl air outlet (12) are used to fully mix with the indoor air again to keep the cold energy distributed as evenly as possible in the room, completing the entire ultra-low temperature air supply process. When the pressure in the air duct is insufficient, the pressure transmitter (18) will send an electrical signal to the control system (28). The control system (28) instructs the pressure fan (15) to start and adjust its speed to maintain the normal operation of the entire device and ensure that cold air can be sent into the room. During the operation of the device, a large amount of condensed water will be generated due to the multiple mixing of cold and hot air. The condensed water flows along the pipe wall or directly drips into the water receiving tray (14) and is discharged from the device through the drain pipe (13).When the device is in the mixed working state of fresh return air and cold air, after the device stops running, the control system (28) will automatically instruct the infrared drying lamp (16) and the ultraviolet sterilization lamp (17) to start, drying the condensed water and mold generated in the drying pipe, keeping the pipe clean and dry. During maintenance, the water tray (14) can be disassembled and cleaned to keep the entire device clean. During the operation of the device, the relevant settings can also be adjusted through the control system (28). The control system (28) will adjust the operating status of the corresponding equipment according to the changed setting information. The thermocouple (32) arranged indoors monitors the indoor temperature and feeds back to the control system (28). The control system (28) controls the electric air valve (19) to adjust the ratio of cold air, fresh air, and return air.

[0059] The above is only a preferred embodiment of this patent and does not impose any limitation on this patent. Any simple modification, change and equivalent structural transformation of the above embodiment without departing from the spirit and technical essence of this patent shall still fall within the scope of protection of the technical solution of this patent.

Claims

1. An ultra-low temperature air supply device based on cascade utilization of cold energy, characterized by: The device comprises a nozzle (1), a primary mixing air duct (3), a secondary mixing air duct (8), an energy storage air duct (7), a fresh air duct, a return air duct, a pressurized fan (15), a pressure transmitter (18), an infrared drying lamp (16), an ultraviolet sterilization lamp (17), a swirl air outlet (12) and a drainage device; The fresh air duct comprises a fresh air input duct (4), a fresh air casing (5), and an electric air valve (19); the fresh air input duct (4) is connected to the fresh air casing (5); an insulation layer is applied to the outside of the fresh air duct; the fresh air casing (5) is nested with the primary mixing air duct (3), and a gap exists between the two; the return air duct comprises a return air input duct (9), a return air casing (10), and an electric air valve (19); the return air input duct (9) is connected to the return air casing (10); the return air casing (10) is nested with the secondary mixing air duct (8), and a gap exists between the two; the primary mixing air duct (3) and the secondary mixing air duct (8) are both provided with uniformly distributed air holes (27); the swirl air outlet (12) is connected to the secondary mixing air duct (8) using an elbow (11) and is installed at the end of the entire device; The device is divided into two connection forms, one of which is that the nozzle (1) is connected to the primary mixing air duct (3) using a variable diameter air duct I (2), the energy storage air duct (7) is connected to the primary mixing air duct (3), and the energy storage air duct (7) is connected to the secondary mixing air duct (8) using a variable diameter air duct II (6), and the diameter of the secondary mixing air duct (8) is slightly larger than that of the primary mixing air duct (3); the other is that the nozzle (1) is connected to the energy storage air duct (7) using a variable diameter air duct I (2), the energy storage air duct (7) is connected to the primary mixing air duct (3), and the secondary mixing air duct (8) is connected to the primary mixing air duct (3) using a variable diameter air duct II (6); the energy storage air duct includes an inner tube wall and an outer tube wall and an interlayer located between the inner tube wall and the outer tube wall, and the interlayer has a phase change material; The pressurizing fan (15) is respectively provided at the end of the primary mixing air duct (3) and the secondary mixing air duct (8); the pressure transmitter (18) is respectively provided in the primary mixing air duct (3) and the secondary mixing air duct (8), and is connected to the control system (28); The infrared drying lamp (16) and the ultraviolet sterilization lamp (17) are respectively provided in the primary mixing air duct (3) and the secondary mixing air duct (8), and the two lamps are fixed to the top of the air duct with fasteners at both ends of the lamp holder; The drainage device comprises a water receiving tray (14) and a drainage pipe (13); the water receiving tray (14) is arranged at the bottom of the primary mixing air duct (3) and the secondary mixing air duct (8) and is connected to the drainage pipe (13); and the drainage device is detachable.

2. The ultra-low temperature air supply device based on cascade utilization of cold energy according to claim 1, characterized in that: The nozzle (1) is coated with a heat-insulating layer on the outside, and an electric air valve (19) is installed on the nozzle (1).

3. The ultra-low temperature air supply device based on cascade utilization of cold energy according to claim 1, characterized in that: An electric air valve (19) is installed on each of the fresh air inlet pipe (4) and the return air inlet pipe (9).

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