A pcm-based regenerative fresh air machine and method of use

Abstract

The application relates to the technical field of new air fan, and particularly relates to a PCM-based heat storage new air fan and a use method thereof, which comprises a new air channel and an indoor air channel, PCM heat exchange mechanisms for heating air are arranged on the new air channel and the indoor air channel, an air inlet fan is arranged on the air inlet of the new air channel, an air outlet fan is arranged on the air outlet of the indoor air channel, a new air filtering assembly is arranged between the new air channel and the PCM heat exchange mechanism, and an indoor air filtering assembly is arranged between the indoor air channel and the PCM heat exchange mechanism. In the application, the PCM changes from a liquid phase to a solid phase after heat exchange with air, the temperature change of the PCM is small, the problem of large heating peak load is solved, liquid-phase PCM can store a large amount of heat energy, so that the PCM does not need to be heated to the temperature of a traditional heat exchange device when the PCM is heated, heat loss is reduced, and the problem of large energy consumption is solved.

Description

Technical Field

[0001] This invention relates to the field of fresh air system technology, specifically to a PCM-based heat storage fresh air system and its usage method. Background Technology

[0002] With people spending most of their time indoors today, indoor air quality (IAQ) in homes is receiving increasing attention. Simultaneously, building energy consumption and methods to reduce it have become a focus for many countries, with some implementing mandatory measures to lower energy consumption. Currently, finding efficient ways to effectively manage the relationship between air quality, human health, and energy use has become a pressing issue requiring resolution.

[0003] Phase change materials (PCMs) are substances that change their physical state while remaining at a constant temperature and can provide latent heat. The process of changing physical properties is called a phase change process, during which the PCM absorbs or releases a large amount of latent heat.

[0004] Existing fresh air systems have the following problems: the temperature of the fresh air heating equipment is relatively high, resulting in a large peak heating load and energy consumption; when there is a large temperature difference between indoors and outdoors, the temperature of the heating equipment is generally increased to bring the heated air temperature to a preset value, which in turn increases the peak heating load and energy consumption.

[0005] Based on the above situation, there is an urgent need for a PCM-based thermal storage fresh air system and its usage method to solve the problems of high heating peak load and large energy consumption. Summary of the Invention

[0006] The purpose of this invention is to provide a PCM-based thermal storage fresh air unit and its usage method, which solves the problems of high heating peak load and high energy consumption.

[0007] This invention is achieved through the following technical solution:

[0008] A PCM-based thermal energy storage fresh air unit includes a fresh air duct and an indoor air duct. The unit is characterized by having a PCM heat exchange mechanism for heating the air on both the fresh air duct and the indoor air duct. An intake fan is installed at the air inlet of the fresh air duct, and an exhaust fan is installed at the air outlet of the indoor air duct. A fresh air filter assembly is installed between the fresh air duct and the PCM heat exchange mechanism, and an indoor air filter assembly is installed between the indoor air duct and the PCM heat exchange mechanism. Since PCM absorbs a large amount of heat energy when heated from a solid to a liquid phase, the PCM changes from a liquid to a solid phase after heat exchange with the air, but the temperature change of the PCM is small, thus solving the problem of large peak heating loads. In traditional high-temperature heating equipment, the heat energy is dissipated into the air through heat conduction from the equipment casing, and the higher the temperature of the heating equipment, the greater the heat loss. In this solution, because the liquid-phase PCM can store a large amount of heat energy, it is not necessary to heat the PCM to the temperature of traditional heat exchange equipment, reducing heat loss and solving the problem of high energy consumption.

[0009] Furthermore, this solution does not exclusively limit the specific structure of the PCM heat exchange mechanism. One feasible solution is that the PCM heat exchange mechanism includes two cooperating PCM heat exchangers, and the two PCM heat exchangers are respectively used to exchange heat in the fresh air duct and the indoor air duct. When this solution is adopted, the hot air blower can independently adjust the flow rate of the fresh air duct and the indoor air duct by the ratio of fresh air to indoor air, thereby changing the temperature of the heated fresh air or indoor air.

[0010] Furthermore, the PCM chamber is rectangular, and a pushing assembly is provided at each of the four right angles of the PCM chamber. The pushing assembly includes a first connecting shell fixedly fitted at the right angle, and a second connecting shell is connected to the first connecting shell. The second connecting shell is fixedly disposed on the inner wall of the PCM chamber. Both the first and second connecting shells have through holes, and the two through holes are connected. A compression spring is provided on the inner wall of the first connecting shell, and a moving column is connected to the end of the compression spring. A mating column is provided on the moving column. The PCM chamber also includes a stirring mechanism. During the stirring process, the stirring mechanism drives the mating column to move. The mating column drives the moving column to move from the first connecting shell along the direction of the second connecting shell within the through hole. The direction of the second connecting shell away from the first connecting shell is an open end, and a part of the moving column is located outside the second connecting shell.

[0011] Furthermore, this solution does not exclusively limit the specific structure of the PCM heat exchanger. One feasible solution is that the PCM heat exchanger includes a heat exchange channel and a PCM chamber for heating the air in the heat exchange channel. Several heat exchange plates and guide plates are staggered in the heat exchange channel. When this solution is adopted, the air can come into full contact with several heat exchange plates in sequence to carry out sufficient heat exchange, thus ensuring the heating effect of fresh air or indoor air.

[0012] Furthermore, both the fresh air duct and the indoor air duct are equipped with wind speed detectors for feedback control of fan speed. Specifically, the intake fan and exhaust fan have three speed control levels: stationary, normal, and high speed. The speed is controlled by the wind speed detectors, which can adapt to different environments.

[0013] Furthermore, the fresh air unit includes a housing, and the housing includes a heat insulation layer and a sound insulation layer. Specifically, the housing is a cuboid and uses a thickened double-layer material, with the inner layer being the heat insulation layer and the outer layer being the sound insulation layer, which can reduce the operating noise of the fresh air unit and reduce heat loss.

[0014] Furthermore, this solution does not exclusively limit the specific structure of the fresh air filtration component. One feasible solution is that the fresh air filtration component includes a coarse filter, a medium filter, and a high-efficiency fresh air filter arranged sequentially along the airflow pattern. Specifically, the coarse filter is a glass fiber filter, the medium filter is a synthetic fiber filter, and the high-efficiency fresh air filter is a HEPA filter. The quality of the fresh air entering the fresh air channel can be guaranteed through the above three layers of filters.

[0015] Furthermore, this solution does not exclusively limit the specific structure of the indoor air filtration component. One feasible solution is that the indoor air filtration component includes a coarse filter, a medium filter, and a high-efficiency indoor air filter arranged sequentially along the airflow pattern. Specifically, the coarse filter is a glass fiber filter, the medium filter is a synthetic fiber filter, and the high-efficiency indoor air filter is an activated carbon filter. The quality of the indoor air entering the indoor air passage can be guaranteed through the above three layers of filters.

[0016] Furthermore, both the fresh air duct and the indoor air duct are equipped with heating compensation plates in the ducts after passing through the PCM heat exchange mechanism. When this solution is adopted, the heating compensation plate detects the air temperature at the air outlet of the fresh air duct and the indoor air duct in real time and automatically starts to compensate for heating, so that the heated fresh air or indoor air reaches the preset temperature.

[0017] A method for using a PCM-based thermal energy storage fresh air system includes:

[0018] S1. Perform pre-ventilation and detect the inlet and outlet wind speed and pressure difference to calculate the flow rate and adjust the rotation power of the intake fan and exhaust fan to maintain wind pressure balance or change the fresh air flow rate.

[0019] S2. Measure the quality of the fresh air. If it is poor, check the fresh air filter components.

[0020] S3. Measure the indoor air quality. If it is poor, check the indoor air filter components.

[0021] S4. If the temperature difference between indoors and outdoors is too large, connect the exhaust vent of the fresh air duct to the air inlet of the indoor air duct. After the fresh air passes through the fresh air duct and is heated by the PCM heat exchange mechanism, it is incorporated into the indoor air duct and heated again by the PCM heat exchange mechanism to reach the preset temperature before being discharged into the room.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0023] 1. Since the PCM can absorb a large amount of heat energy when heated from the solid phase to the liquid phase, the air exchanges heat with the PCM, causing the PCM to change from the liquid phase to the solid phase. However, the temperature change of the PCM is small, which solves the problem of large peak heating load.

[0024] Second, the heat energy of the high-temperature heating equipment in traditional equipment will be dissipated into the air through heat conduction from the equipment shell. The higher the temperature of the heating equipment, the greater the heat loss. In this solution, since the liquid phase PCM can store a large amount of heat energy, it is not necessary to heat the PCM to the temperature of the traditional heat exchange equipment, which reduces heat loss and solves the problem of high energy consumption.

[0025] Third, because several heat exchange plates and guide plates are staggered in the heat exchange channel, the air can come into full contact with the heat exchange plates in sequence to carry out full heat exchange, thus ensuring the heating effect of fresh air or indoor air. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention and a partially enlarged view thereof;

[0028] Figure 2 for Figure 1 Enlarged view of point A;

[0029] Figure 3 for Figure 1 Enlarged view of point B;

[0030] Figure 4This is a schematic diagram of the intake fan structure of the present invention;

[0031] Figure 5 This is a schematic diagram of the PCM heat exchanger installation of the present invention;

[0032] Figure 6 This is a schematic diagram of the PCM heat exchanger structure of the present invention;

[0033] Figure 7 This is a first cross-sectional view of the PCM heat exchanger of the present invention;

[0034] Figure 8 This is a second cross-sectional view of the PCM heat exchanger of the present invention;

[0035] Figure 9 This is an assembly diagram of the first connecting shell and the second connecting shell of the present invention;

[0036] Figure 10 This is a schematic diagram of the interior of the first connecting shell and the second connecting shell after assembly according to the present invention.

[0037] The attached diagram shows the markings and corresponding component names:

[0038] 1. Intake fan; 2. Coarse filter; 3. Medium filter; 4. High-efficiency fresh air filter; 5. Preheating temperature sensing device; 6. PCM heat exchange mechanism; 7. PCM heat exchanger; 8. High-efficiency indoor air filter; 9. Heating compensation plate; 10. Frame; 11. Exhaust fan; 12. First connecting shell; 13. Second connecting shell; 14. Through hole; 15. Compression spring; 16. Moving column; 17. Matching column; 18. Extrusion plate; 19. Extrusion column; 20. Flexible connecting cloth;

[0039] 101. Acceleration Channel;

[0040] 701. Heat exchange plate; 702. Baffle plate; 703. PCM chamber; 704. Motor; 705. Intermediate wheel; 706. Driven wheel; 707. Agitator fan; 708. Positioning column; 709. Boss. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments and accompanying drawings. The illustrative embodiments and descriptions of this invention are for illustrative purposes only and are not intended to limit the invention. It should be noted that this invention is already in the actual research and development stage.

[0042] First, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0043] Example 1:

[0044] like Figure 1 and Figure 2 As shown, a PCM-based heat storage fresh air unit includes a fresh air duct and an indoor air duct. The key feature is that both the fresh air duct and the indoor air duct are equipped with a PCM heat exchange mechanism 6 for heating the air. An intake fan 1 is installed at the air inlet of the fresh air duct, and an exhaust fan 11 is installed at the air outlet of the indoor air duct. A fresh air filter assembly is installed between the fresh air duct and the PCM heat exchange mechanism 6, and an indoor air filter assembly is installed between the indoor air duct and the PCM heat exchange mechanism 6. Since PCM absorbs a large amount of heat energy when heated from a solid phase to a liquid phase, the PCM changes from a liquid phase to a solid phase after heat exchange with the air, but the temperature change of the PCM is small, solving the problem of large peak heating load. In traditional high-temperature heating equipment, the heat energy is dissipated into the air through heat conduction from the equipment casing, and the higher the temperature of the heating equipment, the greater the heat loss. In this solution, since the liquid-phase PCM can store a large amount of heat energy, it is not necessary to heat the PCM to the temperature of traditional heat exchange equipment, reducing heat loss and solving the problem of high energy consumption.

[0045] In this embodiment, the fresh air duct consists of a fresh air inlet duct on the upper left side of the PCM heat exchange mechanism 6 and a fresh air outlet duct on the lower right side of the PCM heat exchange mechanism 6; the indoor air duct consists of an indoor air inlet duct on the upper right side of the PCM heat exchange mechanism 6 and an indoor air outlet duct on the lower left side of the PCM heat exchange mechanism 6. When this scheme is adopted, the two PCM heat exchange mechanisms 6 are staggered, so that the PCM heat exchange mechanism 6 has a longer heat exchange area inside, which can improve the heat exchange efficiency.

[0046] Preferably, PCM condenses into a solid at room temperature, unlike the total heat exchange core filter membrane where there is a temperature difference and vapor pressure difference between the airflows on both sides of the airflow separator. When the two airflows pass through the separator, heat and mass transfer phenomena occur, causing a total heat exchange process. PCM absorbs and releases latent heat through solid-liquid phase change, and its energy recovery is much higher than that of sensible heat recovery.

[0047] like Figure 5 and Figure 6As shown, this scheme does not limit the specific structure of the PCM heat exchange mechanism 6. One feasible scheme is that the PCM heat exchange mechanism 6 includes two cooperating PCM heat exchangers 7, and the two PCM heat exchangers 7 are used to exchange heat in the space in the fresh air duct and the indoor air duct, respectively. When this scheme is adopted, the hot air blower can independently adjust the flow rate of the fresh air duct and the indoor air duct by the ratio of fresh air to indoor air, thereby changing the temperature of the heated fresh air or indoor air.

[0048] like Figure 7 As shown, this solution does not exclusively limit the specific structure of the PCM heat exchanger 7. One feasible solution is as follows: the PCM heat exchanger 7 includes a heat exchange channel and a PCM chamber 703 for heating the air in the heat exchange channel. Several heat exchange plates 701 and guide plates 702 are staggered in the heat exchange channel. When this solution is adopted, the air can come into full contact with the several heat exchange plates 701 in sequence to carry out sufficient heat exchange, ensuring the heating effect of fresh air or indoor air. Specifically, in this embodiment, the PCM chamber 703 and the heat exchange plates 701 are both made of copper. Since copper has strong thermal conductivity, it is beneficial to the heat exchange between the PCM heat exchanger 7 and the air.

[0049] like Figure 9 and Figure 10 As shown, the PCM chamber is rectangular, and a pushing assembly is provided at each of the four right angles of the PCM chamber. The pushing assembly includes a first connecting shell 12 fixedly fitted at the right angle, and a second connecting shell 13 connected to the first connecting shell 12. The second connecting shell 13 is fixedly disposed on the inner wall of the PCM chamber. Through holes 14 are provided on both the first connecting shell 12 and the second connecting shell 13, and the two through holes 14 are connected. A compression spring 15 is provided on the inner wall of the first connecting shell 12, and a moving column 16 is connected to the end of the compression spring 15. A mating column 17 is provided on the moving column 16. The PCM chamber also includes a stirring mechanism. During the stirring process, the stirring mechanism drives the mating column 17 to move. The mating column 17 drives the moving column 16 to move from the first connecting shell 12 along the direction of the second connecting shell 13 within the through hole 14, and a portion of the moving column 16 is located outside the second connecting shell 13.

[0050] Since PCM is a phase change material, when PCM comes into contact with a corner of the PCM chamber, the stirring mechanism alone cannot stir the PCM material attached to the corner. As a result, the PCM material in the corner remains in the corner for a long time, and when it changes from liquid to solid, it will spread. This will not only affect the heating effect, but also greatly increase the risk of wear on the stirring mechanism. Therefore, in the initial state, the mating column 17 is placed inside the first connecting shell 12. During the stirring process, the stirring mechanism drives the mating column 17 to move towards the second connecting shell 13. The mating column 17 then drives the moving column 16 to move away from the compression spring 15. Part of the moving column 16 is placed outside the second connecting shell 13, so the moving column 16 can move outside the second connecting shell 13, thereby pushing the external PCM liquid phase. Since a pushing component has been set at the corner, the mating column 17 in the pushing component moves. When the compression spring 15 recovers its elasticity, it will drive the mating column 17 back to its initial position. During the recovery process, the mating column 17 will also stir the PCM located in the direction of the mating column 17. An extension plate can be added to the end of the mating column 17 to expand the stirring range and prevent the corner of the PCM chamber from solidifying and affecting the heating effect.

[0051] Both the fresh air duct and the indoor air duct are equipped with wind speed detectors for feedback control of fan speed. Specifically, the intake fan 1 and the exhaust fan 11 have three speed control settings: stationary, normal, and high speed. The settings are controlled by the wind speed detectors, which can adapt to different environments.

[0052] like Figure 1 As shown, the fresh air unit includes a housing, which includes a heat insulation layer and a sound insulation layer. Specifically, the housing is a cuboid and uses a thickened double-layer material, with an inner heat insulation layer and an outer sound insulation layer, which can reduce the operating noise of the fresh air unit and reduce heat loss.

[0053] like Figure 2 As shown, this solution does not limit the specific structure of the fresh air filter component. One feasible solution is as follows: the fresh air filter component includes a coarse filter 2, a medium filter 3, and a high-efficiency fresh air filter 4 arranged sequentially along the airflow pattern. Specifically, the coarse filter 2 is a glass fiber filter, the medium filter 3 is a synthetic fiber filter, and the high-efficiency fresh air filter 4 is a HEPA filter. The quality of the fresh air entering the fresh air channel can be guaranteed through the above three layers of filters.

[0054] like Figure 3As shown, this solution does not limit the specific structure of the indoor air filtration component. One feasible solution is as follows: the indoor air filtration component includes a coarse filter 2, a medium filter 3, and a high-efficiency indoor air filter 8 arranged sequentially along the airflow pattern. Specifically, the coarse filter 2 is a glass fiber filter, the medium filter 3 is a synthetic fiber filter, and the high-efficiency indoor air filter 8 is an activated carbon filter. The quality of indoor air entering the indoor air duct can be guaranteed through the above three layers of filters.

[0055] Both the fresh air duct and the indoor air duct are equipped with heating compensation plates 9 in the ducts after passing through the PCM heat exchange mechanism 6. Specifically, in this embodiment, the heating compensation plate 9 is a PTC heating plate. When this scheme is adopted, the heating compensation plate 9 detects the air temperature at the air outlet of the fresh air duct and the indoor air duct in real time and automatically starts to compensate for heating, so that the heated fresh air or indoor air reaches the preset temperature.

[0056] Preferably, the PCM heat exchange mechanism adopts a hexagonal total heat recovery core. The hexagonal total heat recovery core is made of a polymer film. The PCM heat exchanger 7 is installed in the middle and placed in a detachable hexagonal frame 10. The base of the frame 10 is hollow and serves as a water storage tray.

[0057] Preferably, the hot air blower is equipped with an intelligent sensing system, which includes air quality monitoring, fresh air blower temperature monitoring, and air flow rate monitoring. The fresh air blower temperature monitoring uses thermistors, with four thermistors respectively installed in the fresh air inlet duct, fresh air outlet duct, indoor air inlet duct, and indoor air outlet duct. Four wind speed detectors are respectively installed on the inner walls of the fresh air inlet duct, fresh air outlet duct, indoor air inlet duct, and indoor air outlet duct. Four air quality detectors are respectively installed on the top inner wall of the fresh air filter assembly in the fresh air inlet duct, the top inner wall of the indoor air inlet duct, the top inner wall of the unit body between the indoor exhaust fan 11 and the heating compensation plate 9, and the top inner wall between the PCM heat exchange mechanism 6 and another heating compensation plate 9.

[0058] A method for using a PCM-based thermal energy storage fresh air system includes:

[0059] S1. Perform pre-ventilation and detect the inlet and outlet wind speed and pressure difference to calculate the flow rate and adjust the rotation power of the inlet and outlet fans to maintain wind pressure balance or change the fresh air flow rate.

[0060] S2. Measure the quality of the fresh air. If it is poor, check the fresh air filter components.

[0061] S3. Measure the indoor air quality. If it is poor, check the indoor air filter components.

[0062] S4. If the temperature difference between indoors and outdoors is too large, connect the exhaust vent of the fresh air duct to the air inlet of the indoor air duct. After the fresh air passes through the fresh air duct and is heated by the PCM heat exchange mechanism, it is incorporated into the indoor air duct and heated again by the PCM heat exchange mechanism to reach the preset temperature before being discharged into the room.

[0063] Specifically, wind speed is the distance traveled per unit time, and air volume is calculated using Q=3600*F*V.

[0064] Where F is the ventilation area of ​​the air outlet;

[0065] V is the measured average wind speed at the air outlet (m / s).

[0066] The current ventilation or exhaust volume is fed back to the user, and the indoor and outdoor pressure difference is inferred from the flow rate, which in turn adjusts the fan power.

[0067] Preferably, in S1, the temperature changes of the fresh air and indoor air are detected throughout the process by a thermistor. If the temperature change is abnormal or not significant, feedback is sent to the user to determine that a problem has occurred in the heat exchange of a certain part of the fresh air unit.

[0068] By utilizing PCM phase change technology and electric auxiliary heating, the operating environment of fresh air is improved. PCM stores and supplies thermal energy through the absorption and release of latent heat during its phase transition process, featuring high heat storage density, a wide range of materials, and stable operating temperature. By filling the PCM chamber 703 with the heat exchange plate 701, the fresh air and indoor air undergo secondary heat exchange, thereby saving energy. Simultaneously, a PTC heater is used as electric auxiliary heating. The PTC heating element exhibits various thermal and electrical phenomena during operation, demonstrating strong bonding, excellent thermal conductivity and heat dissipation, high efficiency, and safety and reliability.

[0069] Example 2:

[0070] like Figure 1 and Figure 4 As shown, this embodiment only describes the parts that differ from Embodiment 1, specifically:

[0071] Several acceleration channels 101 are formed on the windward surface of the blades of both the intake fan 1 and the exhaust fan 11. The acceleration channels 101 are used to accelerate the airflow in the outer region of the blades, which can reduce the separation of the intake flow, improve efficiency and reduce vortex noise.

[0072] Preferably, auxiliary fans are installed at the air outlet of the fresh air duct and the air inlet of the indoor air duct. The auxiliary fans work in conjunction with the intake fan 1 or the exhaust fan 11 to regulate the airflow speed of the fresh air duct or the indoor air duct.

[0073] Preferably, a preheating temperature sensing device 5 is installed in the fresh air duct. The preheating temperature sensing device 5 is used to measure the air temperature entering the fresh air duct in order to control the solid-liquid state of the PCM in the PCM heat exchanger 7. At room temperature, this PCM is solid.

[0074] Example 3:

[0075] like Figure 7 and Figure 8 As shown, this embodiment only describes the parts that differ from Embodiment 1, specifically:

[0076] The PCM heat exchanger 7 also includes a stirring mechanism. When the PCM is in liquid state and is used to heat the air, the stirring mechanism is used to stir the PCM in the PCM chamber 703 to avoid local solidification affecting the heating effect. When the PCM is heated and melted, the stirring mechanism enables the PCM to melt more quickly and completely.

[0077] This solution does not limit the specific structure of the stirring mechanism. One feasible solution is as follows: The stirring mechanism includes a motor 704 installed on the PCM heat exchanger 7. The motor 704 drives the intermediate wheel 705 and two driven wheels 706 to rotate in sequence. The driven wheels 706 are coaxial with the stirring fan 707 and rotate synchronously. The stirring fan 707 is located in the PCM chamber. The rotation of the stirring fan 707 is controlled by mechanical transmission to stir the PCM. The transmission accuracy is high and the transmission is reliable.

[0078] Preferably, the motor 704 and the intermediate pulley 705 are connected by a belt drive. When the PCM is cured, the stirring fan 707 is obstructed. Due to the overload and slippage of the belt drive, the stirring mechanism can be protected.

[0079] Preferably, during the rotation of the driven wheel 706 driving the stirring fan 707, the stirring fan 707 includes several blades, and a pushing assembly is provided at each of the four corners. The open ends of the second connecting shell 13 in every two pushing assemblies are arranged opposite each other. One blade drives the moving column 16 to move towards the compression spring 15 through any mating post 17. Since the blade is in a circular motion, when the mating post 17 is no longer on the circular trajectory of the blade, the mating post 17 is no longer pushed by the blade, and the compression spring 15 restores its elasticity, driving the mating post 17 to move away from the first connecting shell 12. At the same time, another blade drives the moving column 16 to move away from the compression spring 15 through another opposite mating post 17. At this time, the moving column 16 moves outside the second connecting shell 13. Here, the motor drives the blade to rotate slowly to avoid the blade... If the blades rotate too fast, they will cause wear on the mating column 17. Since the two blades drive the two mating columns 17 to move simultaneously, the two moving columns 16 also move closer to each other at the same time, which can agitate the PCM liquid placed between the two moving columns 16. The PCM liquid in the chamber is viscous. The viscous liquid is squeezed by the pressure on both sides, causing the viscous liquid to deform and move towards the stirring fan. Then the viscous PCM liquid comes into contact with the blades, causing the blades to agitate the viscous liquid, improving the agitation efficiency and reducing the local solidification of the PCM in the chamber. In addition, the moving column 16 is connected to the open end of the second connecting shell 13 by a high-temperature resistant flexible connecting cloth 20, and the mating column 17 is connected to the two through holes 14 by a high-temperature resistant flexible connecting cloth 20, which prevents the PCM liquid from entering the second connecting shell 13 and the first connecting shell 12.

[0080] Preferably, an extrusion plate 18 is provided at the end of the moving column 16, and a plurality of extrusion columns 19 are staggered on the two opposing extrusion plates 18, with gaps formed on adjacent extrusion columns 19, so that a plurality of extrusion columns 19 on one extrusion plate 18 contact a plurality of gaps on the other extrusion plate 18, thereby strengthening the extrusion of the semi-solidified PCM.

[0081] like Figure 5 and Figure 6 As shown, preferably, two positioning posts 708 are formed on the PCM heat exchanger 7 and a boss 709 is formed on the positioning post 708. The boss 709 is used to cooperate with the boss 709 on another PCM heat exchanger 7 so that the positioning posts 708 of the two PCM heat exchangers 7 are coaxially engaged to achieve fixation.

[0082] The working principle of this solution is as follows:

[0083] Fresh air enters the fresh air duct under the action of the intake fan 1, and passes sequentially through the coarse filter 2, medium-efficiency filter 3, and high-efficiency fresh air filter 4. Due to the high PM2.5 content and various bacteria and molds present outdoors, the high-efficiency fresh air filter 4 uses a HEPA filter, which allows air to pass through but prevents fine particles from passing through, filtering out most dust particles with a diameter of 0.1 to 0.3 micrometers. The HEPA filter is most effective at filtering PM2.5 particles and can also capture mold, bacteria, viruses, etc. The fresh air then passes through the preheating temperature sensing device 5, which measures the temperature of the air entering the fresh air duct to control the solid-liquid state of the PCM in the PCM heat exchanger 7. After heat exchange in the PCM heat exchanger 7, the fresh air is discharged into the fresh air outlet duct and passes through the heating compensation plate 9. The heating compensation plate 9 monitors the air temperature in the fresh air outlet duct in real time and automatically activates to compensate for the heating, ensuring that the fresh air reaches the preset temperature. Under the action of the auxiliary fan, the fresh air enters the room or is incorporated into the indoor air duct for further heat exchange.

[0084] Indoor air enters the indoor air duct under the action of another auxiliary fan, passing sequentially through a coarse filter 2, a medium-efficiency filter 3, and a high-efficiency indoor air filter 8. The high-efficiency indoor air filter 8 uses activated carbon to remove formaldehyde, odors, TVOCs, and other organic gaseous pollutants, preventing them from being discharged outdoors and protecting the environment. The indoor air then passes through a preheating temperature sensing device 5, which measures the temperature of the air entering the fresh air duct to control the solid-liquid state of the PCM in the PCM heat exchanger 7. After heat exchange in the PCM heat exchanger 7, the fresh air is discharged into the fresh air outlet duct and passes through a heating compensation plate 9. The heating compensation plate 9 monitors the air temperature in the indoor air outlet duct in real time and automatically activates to compensate for the heating, ensuring that the heated indoor air reaches the preset temperature before entering the room under the action of the exhaust fan 11.

[0085] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A PCM-based heat storage fresh air system, comprising a fresh air duct and an indoor air duct, characterized in that: Both the fresh air duct and the indoor air duct are equipped with a PCM heat exchange mechanism (6) for heating the air. The fresh air duct is equipped with an intake fan (1), and the indoor air duct is equipped with an exhaust fan (11). A fresh air filter assembly is provided between the fresh air duct and the PCM heat exchange mechanism (6), and an indoor air filter assembly is provided between the indoor air duct and the PCM heat exchange mechanism (6). The PCM heat exchange mechanism (6) includes two cooperating PCM heat exchangers (7), and the two PCM heat exchangers (7) are used to exchange heat in the fresh air duct and the indoor air duct, respectively. The PCM heat exchanger (7) includes a heat exchange channel and a PCM chamber (703) for heating the air in the heat exchange channel. Several heat exchange plates (701) and guide plates (702) are staggered in the heat exchange channel. The PCM chamber is rectangular, and a pushing component is provided at each of the four right angles of the PCM chamber. The pushing component includes a first connecting shell (12) fixedly fitted at the right angle. A second connecting shell (13) is also connected to the first connecting shell (12). The second connecting shell (13) is fixedly installed on the inner wall of the PCM chamber. Through holes (14) are provided on both the first connecting shell (12) and the second connecting shell (13). The through hole (14) is connected, and a compression spring (15) is provided on the inner wall of the first connecting shell (12). The end of the compression spring (15) is connected to a moving column (16). A mating column (17) is provided on the moving column (16). The PCM chamber also includes a stirring mechanism. During the stirring process, the stirring mechanism drives the mating column (17) to move. The mating column (17) drives the moving column (16) to move from the first connecting shell (12) along the direction of the second connecting shell (13) in the through hole (14). The direction of the second connecting shell (13) away from the first connecting shell (12) is the open end, and a part of the moving column (16) is located outside the second connecting shell (13).

2. The PCM-based thermal energy storage fresh air system according to claim 1, characterized in that: Both the fresh air duct and the indoor air duct are equipped with wind speed detectors for feedback control of fan speed.

3. A PCM-based thermal energy storage fresh air system according to claim 1, characterized in that: The fresh air unit includes a housing, and the housing includes a heat insulation layer and a sound insulation layer.

4. A PCM-based thermal energy storage fresh air system according to claim 1, characterized in that: The fresh air filtration assembly includes a coarse filter (2), a medium filter (3), and a high-efficiency fresh air filter (4) arranged sequentially along the airflow pattern.

5. A PCM-based thermal energy storage fresh air system according to claim 1, characterized in that: The indoor air filtration assembly includes a coarse filter (2), a medium filter (3), and a high-efficiency indoor air filter (8) arranged sequentially along the airflow pattern.

6. A PCM-based thermal energy storage fresh air system according to claim 1, characterized in that: Both the fresh air duct and the indoor air duct are equipped with heating compensation plates (9) in the duct after passing through the PCM heat exchange mechanism (6).

7. A method of using a PCM-based thermal energy storage fresh air system, comprising using a PCM-based thermal energy storage fresh air system as described in any one of claims 1 to 6, characterized in that, include: S1. Perform pre-ventilation and detect the inlet and outlet wind speed and pressure difference to calculate the flow rate and adjust the rotation power of the inlet and outlet fans to maintain wind pressure balance or change the fresh air flow rate. S2. Measure the quality of the fresh air. If it is poor, check the fresh air filter components. S3. Measure the indoor air quality. If it is poor, check the indoor air filter components. S4. If the temperature difference between indoors and outdoors is too large, connect the exhaust vent of the fresh air duct to the air inlet of the indoor air duct. After the fresh air passes through the fresh air duct and is heated by the PCM heat exchange mechanism, it is incorporated into the indoor air duct and heated again by the PCM heat exchange mechanism to reach the preset temperature before being discharged into the room.

Images