A fresh air air conditioner with multi-stage heat and moisture exchange and a control method thereof

Abstract

A multi-stage heat and moisture exchange fresh air air conditioner and control method relates to the field of air conditioning technology. This invention exchanges indoor exhaust air with outdoor fresh air through a heat and moisture film, then controls the connection between the compressor and each heat exchanger, as well as the spraying state of the humidifier, to efficiently and energy-efficiently control the flow direction of heat and water molecules. Through multi-stage heat exchange (heat and moisture film, three-heat exchanger heat pump, and condensate spray), it achieves control and management of indoor environmental temperature and humidity during seasonal operating mode switching. In isothermal dehumidification mode, the compressor uses a reversing valve to form a condenser in the second and third heat exchangers, and an evaporator in the first heat exchanger. A humidifier sprays water mist to assist in cooling. The heat and moisture exchange core, intake fan, and exhaust fan work in synergy, isothermally dehumidifying the outdoor fresh air before delivering it into the room and achieving indoor exhaust. The dehumidification and cooling and heating and humidification modes vary the operating state of the heat exchangers and the spraying state of the humidifier to achieve temperature and humidity regulation.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a fresh air air conditioning with multi-stage heat and moisture exchange and a control method thereof. Background Art

[0002] As people's living standards continue to improve, their demand for indoor air comfort is also increasing. Currently, traditional air conditioners primarily focus on temperature regulation and lack effective humidity control. While some high-end air conditioners have some dehumidification capabilities, these are typically simple dehumidification functions in cooling mode, unable to achieve precise isothermal dehumidification and ineffective in low-temperature, high-humidity environments. Most air conditioners are also unable to humidify, requiring the use of additional humidification equipment, failing to provide users with a one-stop temperature and humidity control solution.

[0003] As for some simple dehumidification or humidification devices available on the market, for example, dehumidifiers use the principle of refrigeration to condense water vapor in the air into water and discharge it outdoors, thereby reducing indoor humidity; humidifiers add water vapor to the air through spraying or other methods to increase humidity. These devices are usually independent of the air conditioning system and need to be purchased and placed separately. Not only do they take up space, but they also require manual intervention during use, such as regular water addition and cleaning, making them inconvenient to use. In addition, these devices often have difficulty in accurately controlling temperature while adjusting humidity, and cannot achieve coordinated regulation of indoor temperature and humidity, resulting in less than ideal indoor environmental comfort.

[0004] Furthermore, the demands for indoor temperature and humidity vary significantly across seasons. While existing air conditioners can reduce humidity to a certain extent during summer cooling, this often results in excessively low indoor temperatures, making people uncomfortable. During winter heating, however, they fail to effectively address the issue of dry indoor air and may even exacerbate the dryness, failing to meet users' seasonal demands for an ideal indoor environment. If additional existing dehumidification or humidification equipment is purchased for use, since they operate independently of the air conditioner, additional energy consumption is required for each operation. For example, in the summer, when simultaneous cooling and dehumidification are required, operating the air conditioner and dehumidifier separately not only increases energy consumption but can also lead to poor indoor temperature and humidity regulation due to the lack of coordination between the devices, further wasting energy. Summary of the Invention

[0005] One of the purposes of the present invention is to provide a fresh air air conditioner with multi-stage heat and moisture exchange, providing users with an air conditioning solution that can accurately adjust indoor temperature and humidity throughout the year, with high comfort and better energy utilization efficiency.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solution: a fresh air air conditioner with multi-stage heat and moisture exchange, comprising:

[0007] The outdoor fresh air inlet channel is provided with an air inlet fan at the end thereof for delivering outdoor fresh air into the room;

[0008] Indoor return air exhaust duct, at the end of which is provided an exhaust fan for sending indoor return air to the outside;

[0009] A heat and moisture exchange core connects the outdoor fresh air inlet channel and the indoor return air exhaust channel to facilitate heat and moisture exchange between the outdoor fresh air and the indoor return air;

[0010] The temperature and humidity control module includes a first heat exchanger and a second heat exchanger arranged in the outdoor fresh air inlet channel, which are used to successively perform heat exchange on the outdoor fresh air after passing through the heat and moisture exchange core, and also includes a third heat exchanger arranged in the indoor return air exhaust channel, which is used to perform heat exchange on the indoor return air after passing through the heat and moisture exchange core;

[0011] The humidification module includes a first humidifier arranged in the outdoor fresh air inlet channel, which is used to humidify the first heat exchanger and the second heat exchanger as needed, and also includes a second humidifier arranged in the indoor return air exhaust channel, which is used to humidify the third heat exchanger as needed;

[0012] The compressor is used to transport heat exchange medium to the first heat exchanger, the second heat exchanger and the third heat exchanger.

[0013] Preferably, the compressor is connected to the first heat exchanger or the third heat exchanger through a four-way reversing valve, and the compressor is connected to the second heat exchanger through a three-way reversing valve. A first expansion valve is connected between the first heat exchanger and the third heat exchanger, and a second expansion valve is connected between the second heat exchanger and the third heat exchanger.

[0014] More preferably, the first humidifier and the second humidifier each include a humidifying mechanism, the humidifying mechanism including a water receiving pan arranged below the corresponding heat exchanger and a spray nozzle above the same, the spray nozzle being connected to the water receiving pan through a water suction pipe, the water suction pipe being equipped with a Bernoulli valve, and an air pump being provided at one end of the Bernoulli valve. Starting the air pump allows air to pass through the Bernoulli valve to generate negative pressure, so that the water suction pipe draws water in the water receiving pan into the Bernoulli valve and mixes the water with air before spraying it out through the spray nozzle.

[0015] More preferably, the water receiving tray is connected to an automatic water replenishing valve, and the automatic water replenishing valve is provided with a normally closed two-way solenoid valve for externally receiving clean water to replenish water to the water receiving tray.

[0016] More preferably, a normally open electric drain valve is provided at the bottom of the water receiving tray and an overflow port is provided at the top; and a layer of antibacterial copper mesh is also provided on the inner wall surface of the water receiving tray.

[0017] More preferably, the first heat exchanger, the second heat exchanger and the third heat exchanger are all arranged in an inclined shape along the height direction to increase the windward surface of the heat exchange and the contact area with the water mist sprayed by the spray nozzle.

[0018] More preferably, both the inlet of the outdoor fresh air inlet channel and the inlet of the indoor return air exhaust channel are provided with filter cotton.

[0019] More preferably, it also includes a box body, and the outdoor fresh air inlet channel and the indoor return air exhaust channel are independently arranged in the box body, the inlet of the outdoor fresh air inlet channel is located at the rear of the right end of the box body, and the outlet of the outdoor fresh air inlet channel is located at the front of the left end of the box body, the inlet of the indoor return air exhaust channel is located at the front of the right end of the box body, and the outlet of the indoor return air exhaust channel is located at the rear of the left end of the box body, and the front of the box body is installed close to the indoor side and the rear is installed close to the outdoor side.

[0020] In addition, the present invention also provides a multi-stage heat and moisture exchange fresh air air conditioning multi-connected system, which includes multiple of the above-mentioned boxes and a compressor. The inlet of the outdoor fresh air inlet channel and the outlet of the indoor return air exhaust channel of each box are connected to the outdoor atmosphere through independent pipelines, and the heat exchanger inside each box is connected to the compressor in parallel.

[0021] In addition, the present invention also provides a control method for the above-mentioned multi-stage heat and moisture exchange fresh air air conditioner, which implements the following working mode through control instructions:

[0022] Isothermal dehumidification mode: the compressor is connected to the second heat exchanger and the third heat exchanger so that the second heat exchanger and the third heat exchanger both form a condenser, and then the medium in the condenser enters the first heat exchanger through the expansion valve, so that the first heat exchanger forms an evaporator, the second humidifier is turned on to spray water mist on the third heat exchanger, the air intake fan and the exhaust fan are turned on, and the outdoor fresh air enters the outdoor fresh air inlet channel and the indoor return air enters the indoor return air exhaust channel. After that, the outdoor fresh air first passes through the heat and moisture exchange core for heat and moisture exchange, and then passes through the evaporator formed by the first heat exchanger to reduce the temperature and dehumidify, and then passes through the condenser formed by the second heat exchanger to increase the temperature, and finally is sent into the room to realize isothermal dehumidification fresh air supply; at the same time, the indoor return air passes through the condenser formed by the third heat exchanger to reduce the temperature of the medium in the condenser, and then is discharged to the outside in the form of high-temperature and high-humidity air. The second humidifier sprays water mist on the third heat exchanger to provide auxiliary cooling and pressure reduction for the medium in the third heat exchanger, so as to reduce the energy consumption of the compressor.

[0023] Dehumidification and cooling mode: the compressor is connected to the third heat exchanger so that the third heat exchanger forms a condenser, and then the medium in the condenser enters the first heat exchanger and the second heat exchanger through the expansion valve, so that the first heat exchanger and the second heat exchanger form an evaporator, the second humidifier is turned on to spray water mist on the third heat exchanger, the air intake fan and the exhaust fan are turned on, and the outdoor fresh air enters the outdoor fresh air intake channel and the indoor return air enters the indoor return air exhaust channel. After that, the outdoor fresh air first passes through the heat and moisture exchange core for heat and moisture exchange, and then passes through the evaporator formed by the first heat exchanger and the second heat exchanger to reduce the temperature and dehumidify, and then is sent into the room to realize dehumidification and cooling fresh air supply; at the same time, the indoor return air passes through the condenser formed by the third heat exchanger to reduce the temperature of the medium in the condenser, and then is discharged to the outside in the form of high-temperature and high-humidity air. The second humidifier sprays water mist on the third heat exchanger to provide auxiliary cooling and pressure reduction for the medium in the third heat exchanger, so as to reduce the energy consumption of the compressor.

[0024] Humidification and heating mode: the compressor is connected to the first heat exchanger and the second heat exchanger to form a condenser, and then the medium in the condenser enters the third heat exchanger through the expansion valve, so that the third heat exchanger forms an evaporator, the first humidifier is turned on to spray water mist on the first heat exchanger and the second heat exchanger, the air intake fan and the exhaust fan are turned on, and the outdoor fresh air enters the outdoor fresh air inlet channel and the indoor return air enters the indoor return air exhaust channel. After that, the outdoor fresh air first passes through the heat and moisture exchange core to exchange heat and moisture, and then the outdoor fresh air first passes through the condenser formed by the first heat exchanger and the second heat exchanger to increase the temperature, and is humidified under the action of the water mist sprayed by the first humidifier, and then is sent into the room to realize the humidification and heating fresh air supply; at the same time, the indoor return air passes through the evaporator formed by the third heat exchanger for heat exchange and cooling, and then is discharged to the outside in the form of low-temperature dry air.

[0025] Compared with the prior art, the beneficial effects of the present invention are embodied in:

[0026] 1. Sensors monitor indoor temperature and humidity in real time, automatically controlling the operating frequency of the compressor and fan based on preset target parameters. The temperature and humidity control module's multiple heat exchangers, combined with the humidification module, enable precise heat exchange and humidification of both outdoor fresh air and indoor return air, efficiently and energy-efficiently controlling the flow of heat and water molecules. Multi-stage heat exchange (heat and moisture exchange core, heat exchanger, condensate spraying) is implemented, meeting the need for precise temperature and humidity regulation in different seasons and environments. Isothermal dehumidification is achieved in spring and autumn, dehumidification and cooling in summer, and humidification and heating in winter. This not only provides a comfortable and stable temperature and humidity environment indoors, but also ensures continuous indoor air renewal, effectively removing stale air and introducing fresh air, improving indoor air quality and enhancing living and working comfort.

[0027] 2. By setting up a heat and moisture exchange core, the outdoor fresh air and the indoor return air exchange heat and moisture, effectively recovering the cold or heat and water vapor in the indoor return air, reducing dependence on external energy, and improving energy utilization efficiency. Only two low-energy fans are required to provide power for the airflow, effectively reducing the overall operating energy consumption of the air conditioner and achieving energy-saving and environmental protection effects. In addition, in the isothermal dehumidification mode and the dehumidification cooling mode, the humidifier can also be used to provide auxiliary cooling for the medium in the condenser, thereby allowing the compressor to reduce pressure and improve its capacity and energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure in the embodiment;

[0029] Figure 2 Schematic diagram of the structure of the first humidifier in the embodiment;

[0030] Figure 3 Schematic diagram of the principle of the isothermal dehumidification mode in the embodiment;

[0031] Figure 4 Schematic diagram of the principle of the dehumidification and cooling mode in the embodiment;

[0032] Figure 5 This is a schematic diagram of the principle of the humidification and heating mode in the embodiment;

[0033] Figure 6 Schematic diagram of a fresh air air conditioning multi-connected system with multi-stage heat and moisture exchange in an embodiment;

[0034] Figure 7 Enthalpy-psychrometric diagram of the air conditioning wet air process in summer and winter in the embodiment;

[0035] Figure 8 1 is the psychrometric diagram of the isothermal dehumidification process of the air conditioner in spring in the embodiment.

[0036] In the picture:

[0037] 1. Outdoor fresh air inlet duct; 2. Indoor return air exhaust duct; 3. Air inlet fan; 4. Exhaust fan; 5. Heat and moisture exchange element; 6. First heat exchanger; 7. Second heat exchanger; 8. Third heat exchanger; 9. Compressor; 10. Four-way reversing valve; 11. Three-way reversing valve; 12. First expansion valve; 13. Second expansion valve; 14. Drain pan; 15. Spray nozzle; 16. Suction pipe; 17. Bernoulli valve; 18. Air pump; 19. Automatic water replenishment valve; 20. Normally open drain electric valve; 21. Overflow port; 22. Filter cotton; 23. Container; 24. Normally closed two-way solenoid valve. DETAILED DESCRIPTION

[0038] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and drawings. The contents mentioned in the embodiments are not intended to limit the present invention.

[0039] It should be noted in advance that, in the present invention, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connected," and "fixed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances. Furthermore, in the present invention, unless otherwise expressly specified or limited, a first feature "above" or "below" a second feature may include direct contact between the first and second features, or may include contact between the first and second features not directly but through another feature between them.

[0040] like Figure 1 As shown, a fresh air air conditioner with multi-stage heat and moisture exchange comprises:

[0041] The outdoor fresh air inlet channel 1 is provided with an air inlet fan 3 at the end thereof for delivering outdoor fresh air into the room.

[0042] The indoor return air exhaust duct 2 is provided with an exhaust fan 4 at its end for sending the indoor return air outdoors.

[0043] The heat and moisture exchange core 5 connects the outdoor fresh air inlet channel 1 and the indoor return air exhaust channel 2 to facilitate heat and moisture exchange between the outdoor fresh air and the indoor return air.

[0044] The temperature and humidity adjustment module includes a first heat exchanger 6 and a second heat exchanger 7 arranged in the outdoor fresh air inlet channel 1, which are used to perform heat exchange on the outdoor fresh air after passing through the heat and moisture exchange core 5, and also includes a third heat exchanger 8 arranged in the indoor return air exhaust channel 2, which is used to perform heat exchange on the indoor return air after passing through the heat and moisture exchange core 5.

[0045] The humidification module includes a first humidifier arranged in the outdoor fresh air inlet channel 1, which is used to humidify the first heat exchanger 6 and the second heat exchanger 7 as needed, and also includes a second humidifier arranged in the indoor return air exhaust channel 2, which is used to humidify the third heat exchanger 8 as needed.

[0046] Compressor 9 is used to deliver heat exchange medium to first heat exchanger 6, second heat exchanger 7, and third heat exchanger 8. Sensors can also be used to monitor indoor temperature and humidity, and automatically control the operating frequency of the compressor and fan based on preset target parameters to enhance the intelligent control effect of the equipment.

[0047] In the above structure, the compressor 9 is connected to the first heat exchanger 6 or the third heat exchanger 8 through a four-way reversing valve 10, and the compressor 9 is connected to the second heat exchanger 7 through a three-way reversing valve 11. A first expansion valve 12 is connected between the first heat exchanger 6 and the third heat exchanger 8, and a second expansion valve 13 is connected between the second heat exchanger 7 and the third heat exchanger 8.

[0048] In this embodiment, the first humidifier and the second humidifier each include a set of humidifying mechanisms. Taking the humidifying mechanism of the first humidifier as an example, Figure 2 As shown, the humidification mechanism includes a water receiving pan 14 disposed below the corresponding heat exchanger and a spray nozzle 15 disposed above. The spray nozzle 15 is connected to the water receiving pan 14 via a water suction pipe 16. The water suction pipe 16 is equipped with a Bernoulli valve 17. An air pump 18 is provided at one end of the Bernoulli valve 17. Activating the air pump 18 forces air through the Bernoulli valve 17, generating negative pressure. This causes the water suction pipe 16 to draw water from the water receiving pan 14 into the Bernoulli valve 17, where it mixes with the air before being sprayed out through the spray nozzle 15. By utilizing the principle of negative pressure generated by the Bernoulli valve 17 and the power provided by the air pump 18 to draw water in, mix it with the air, and spray it out, this method consumes less energy than traditional humidification methods, such as electrode humidification, reducing energy consumption during air conditioning operation and achieving excellent energy-saving effects. Furthermore, the water in the water suction pipe 16 is pre-mixed with the air, which makes the water mist sprayed from the spray nozzle 15 more dispersed, thereby improving heat transfer performance.

[0049] In both isothermal dehumidification and dehumidification cooling modes, a humidifier can be used to provide auxiliary cooling for the medium in the condenser, thereby reducing compressor pressure and improving compressor performance and energy efficiency. This is because water has a large specific heat capacity and can absorb a large amount of heat. Spraying water mist on the condenser surface absorbs some of the heat released during the refrigerant condensation process and evaporates, thereby enhancing the condenser's heat dissipation. This improved condenser heat dissipation lowers the temperature of the condensed refrigerant liquid, and the condensing pressure also decreases accordingly. According to the principles of the refrigeration cycle, the compressor's discharge pressure is equal to the condensing pressure. When the condensing pressure decreases, the compressor's discharge pressure also decreases. Lowering the compressor's discharge pressure also reduces the compressor's compression ratio. The compression ratio is the ratio of the compressor's discharge pressure to the suction pressure. A lower compression ratio means less work is required to compress the refrigerant vapor. This improves compressor performance, as the compressor can compress more refrigerant vapor with the same power consumption. Furthermore, since compressor power consumption is reduced and cooling capacity increases due to the increased refrigerant circulation volume, energy efficiency is improved.

[0050] Furthermore, the water tray 14 is connected to an automatic water replenishment valve 19, which is equipped with a normally closed two-way solenoid valve 24 for receiving clean water from an external source to replenish the water tray 14. The bottom of the water tray 14 is equipped with a normally open electric drain valve 20 and an overflow port 21 at the top. The inner wall of the water tray 14 is also covered with a layer of antibacterial copper mesh.

[0051] In this embodiment, the first heat exchanger 6 , the second heat exchanger 7 and the third heat exchanger 8 are all arranged in an inclined shape along the height direction to increase the windward surface of the heat exchange and the contact area with the water mist sprayed by the spray nozzle 15 .

[0052] To ensure the quality of the fresh air introduced and the lifespan of the equipment, cotton filters 22 are installed at the entrance of both the outdoor fresh air inlet duct 1 and the entrance of the indoor return air exhaust duct 2. Cotton filters 22 can initially filter the air entering the air conditioning system, intercepting impurities such as dust, pollen, and hair in the air, preventing these impurities from entering the air conditioner, avoiding contamination and blockage of subsequent heat and moisture exchange, humidification, and other components, thereby ensuring the normal operation and service life of the air conditioning system. By filtering out harmful impurities in the air, the fresh air entering the room and the recycled return air are cleaner, helping to improve indoor air quality and provide users with a healthier and more comfortable living and working environment. This is of great significance for people with allergies or in places with high air quality requirements.

[0053] When installing the multi-stage heat and moisture exchange fresh air air conditioner, a housing 23 can be provided, with the outdoor fresh air inlet duct 1 and the indoor return air exhaust duct 2 independently arranged within the housing 23. The inlet of the outdoor fresh air inlet duct 1 is located at the rear of the right end of the housing 23, and the outlet of the outdoor fresh air inlet duct 1 is located at the front of the left end of the housing 23. The inlet of the indoor return air exhaust duct 2 is located at the front of the right end of the housing 23, and the outlet of the indoor return air exhaust duct 2 is located at the rear of the left end of the housing 23. The front of the housing 23 is installed closer to the indoor side, and the rear is installed closer to the outdoor side. This makes the overall structure of the air conditioner more compact, capable of completing the processing of fresh air and return air within a limited space, improving space utilization, facilitating installation in various locations, and is particularly suitable for indoor environments with limited space. It also facilitates the installation and subsequent maintenance of the air conditioner, as maintenance personnel can inspect and maintain the indoor components of the air conditioner from the indoor side.

[0054] In addition, the multi-stage heat and moisture exchange fresh air air conditioner provided in this embodiment can be set in parallel in multiple rooms or areas indoors to form a wet fresh air air conditioner multi-connected system, such as Figure 6As shown, the system specifically includes multiple boxes 23 and a compressor 9. The inlet of the outdoor fresh air inlet channel 1 and the outlet of the indoor return air exhaust channel 2 of each box 23 are connected to the outdoor atmosphere through independent pipelines. The heat exchanger inside each box 23 is connected to the compressor 9 in parallel. This means that the entire system only needs to be equipped with one compressor 9, which greatly reduces the number of compressors and energy consumption, lowers the operating cost of the entire system, improves energy utilization efficiency, and achieves energy-saving operation, meeting modern environmental protection and energy-saving requirements.

[0055] Since the compressor 9 can be arranged indoors and there is no need to set up a separate compressor for each room or area, the problem of the large floor space occupied by the indoor and outdoor units in traditional multi-connected air-conditioning systems is avoided, making the layout of the entire air-conditioning system more compact, saving indoor and outdoor space, and being particularly suitable for building environments with limited space, thereby improving space utilization. In addition, the inlet of the outdoor fresh air inlet channel 1 of each box 23 and the outlet of the indoor return air exhaust channel 2 are connected to the outdoor atmosphere through independent pipes. During installation, it is only necessary to connect the corresponding air outlet of each box to the outdoor atmosphere, and at the same time, connect the heat exchanger inside the box to the compressor 9 in parallel. The installation process is relatively simple, which reduces the installation difficulty and installation cost and improves the installation efficiency.

[0056] It is worth mentioning that multiple boxes 23 share one compressor 9, which reduces the possible failure points caused by the simultaneous operation of multiple compressors 9 and improves the reliability of the system. At the same time, the compressor 9 is arranged indoors, avoiding the problems faced by the outdoor unit of the traditional air-conditioning system when operating in harsh outdoor environments such as wind, sun, and rain. This further extends the service life of the compressor 9, reduces the maintenance cost and failure rate of the system, and ensures the stable operation of the entire wet fresh air air conditioning multi-connected system. In addition, the lack of the outdoor unit structure in the traditional air-conditioning system can make the appearance of the building more neat and beautiful, and the installation of the outdoor unit will not destroy the overall beauty of the building. It meets the requirements of modern buildings for appearance design and is particularly suitable for commercial buildings, residential communities and other places with high requirements for building appearance.

[0057] Taking the seasonal environment of Hengyang City, Hunan Province as an example, the control method of the fresh air air conditioner with multi-stage heat and moisture exchange provided in the above embodiment mainly implements the following operating modes through control instructions:

[0058] Spring isothermal dehumidification mode: Figure 3As shown, the compressor 9 is connected to the second heat exchanger 7 through the three-way reversing valve 11, and is connected to the third heat exchanger 8 through the four-way reversing valve 10, so that the second heat exchanger 7 and the third heat exchanger 8 both form condensers, and then the medium in the second heat exchanger 7 (condenser) enters the third heat exchanger 8 (condenser) through the second expansion valve 13. The end of the pipeline is then passed through the first expansion valve 12 to enter the first heat exchanger 6, so that the first heat exchanger 6 forms an evaporator. The second humidifier is turned on to spray water mist on the third heat exchanger 8 (condenser), and the air inlet fan 3 and the exhaust fan 4 are turned on. The outdoor fresh air enters the outdoor fresh air inlet channel 1, and the indoor return air enters the indoor return air exhaust channel 2, and then first passes through the heat and moisture exchange core. 5 performs heat and moisture exchange, reducing the humidity of the outdoor fresh air. The outdoor fresh air then passes through the evaporator formed by the first heat exchanger 6 to reduce its temperature and further dehumidify it. It then passes through the condenser formed by the second heat exchanger 7 to raise its temperature before being delivered indoors to achieve isothermal dehumidified fresh air supply. The medium in the first heat exchanger 6 (evaporator) returns to the compressor 9 through the four-way reversing valve 10. At the same time, the indoor return air passes through the condenser formed by the third heat exchanger 8 to reduce the temperature of the medium in the condenser before being discharged outdoors as high-temperature, high-humidity air. During this process, the second humidifier sprays water mist on the third heat exchanger 8 to provide auxiliary cooling and pressure reduction for the medium in the third heat exchanger 8, thereby reducing the energy consumption of the compressor 9. The energy efficiency in this mode is as follows: the total power of the compressor 9 and the air pump 18 of the second humidifier is 0.70KW; where:

[0059] cop =(h 送 -h 进 )×350×1.2 / 3600 / 0.7

[0060] =(65-37.1)×350×1.2 / 3600 / 0.7=4.65.

[0061] Summer dehumidification cooling mode: Figure 4As shown, the compressor 9 is connected to the third heat exchanger 8 through the four-way reversing valve 10, so that the third heat exchanger 8 forms a condenser, and then the medium in the condenser passes through the first expansion valve 12 and the second expansion valve 13 respectively into the first heat exchanger 6 and the second heat exchanger 7, so that the first heat exchanger 6 and the second heat exchanger 7 form an evaporator, the second humidifier is turned on to spray water mist on the third heat exchanger 8 (condenser), the air inlet fan 3 and the exhaust fan 4 are turned on, the outdoor fresh air enters the outdoor fresh air inlet channel 1, and the indoor return air enters the indoor return air exhaust channel 2, and then first passes through the heat and moisture exchange core 5 for heat and moisture exchange to reduce the humidity of the outdoor fresh air, and then the outdoor fresh air passes through the first The evaporator formed by heat exchanger 6 and the second heat exchanger 7 lowers the temperature and dehumidifies the air, which is then delivered to the room for dehumidified, cooled, and fresh air supply. The medium in the first heat exchanger 6 (evaporator) returns to compressor 9 via four-way reversing valve 10, while the medium in the second heat exchanger 7 (evaporator) returns to compressor 9 via three-way reversing valve 11. Simultaneously, the indoor return air passes through the condenser formed by the third heat exchanger 8 to lower the temperature of the medium in the condenser before being discharged outdoors as high-temperature, high-humidity air. During this process, the second humidifier sprays water mist onto the third heat exchanger 8 to assist in cooling and reducing the pressure of the medium in the third heat exchanger 8, thereby reducing the energy consumption of compressor 9. The energy efficiency in this mode is as follows: The total power of compressor 9 and the air pump 18 of the second humidifier is 0.76 kW; among which:

[0062] eer =(h 进 -h 送 )×350×12 / 3600 / 0.76

[0063] =(107.1-38.5)×350×1.2 / 3600 / 0.76=10.53.

[0064] Winter humidification heating mode: Figure 5As shown, the compressor is connected to the first heat exchanger 6 through the four-way reversing valve 10 and to the second heat exchanger 7 through the three-way reversing valve 11, so that the first heat exchanger 6 and the second heat exchanger 7 both form condensers, and then the medium in the first heat exchanger 6 (condenser) and the medium in the second heat exchanger 7 (condenser) enter the third heat exchanger 8 through the first expansion valve 12 and the second expansion valve 13 respectively, so that the third heat exchanger 8 forms an evaporator, the first humidifier is turned on to spray water mist on the first heat exchanger 6 (condenser) and the second heat exchanger 7 (condenser), the air inlet fan 3 and the exhaust fan 4 are turned on, and the outdoor fresh air enters the outdoor fresh air inlet channel 1 and the indoor After entering the indoor return air exhaust duct 2, the indoor return air first passes through the heat and moisture exchange core 5 to exchange heat and moisture, increasing the humidity of the outdoor fresh air. The outdoor fresh air then passes through the condenser formed by the first heat exchanger 6 (condenser) and the second heat exchanger 7 (condenser) to increase the temperature. It is humidified by the water mist sprayed by the first humidifier and then sent into the room to realize the humidified and heated fresh air supply. The medium in the third heat exchanger 8 (evaporator) returns to the compressor 9 through the four-way reversing valve 10. At the same time, the indoor return air passes through the evaporator formed by the third heat exchanger 8 to increase the temperature of the medium in the condenser, and is then discharged outdoors as low-temperature dry air. The energy efficiency in this mode is as follows: the total power of the compressor 9 and the air pump 18 of the second humidifier is 0.76KW; among which:

[0065] cop=(h 送 -h 进 )×350×1.2 / 3600 / 0.76

[0066] =(57.5-2.7)×350×1.2 / 3600 / 0.76=8.41.

[0067] The multi-stage heat and moisture exchange fresh air air conditioner of the present invention exchanges heat between indoor exhaust air and outdoor fresh air through the heat and moisture membrane within the heat and moisture exchange core. The air conditioner then controls the communication between the compressor and each heat exchanger, as well as the spraying mode of the humidifier, to efficiently and energy-efficiently control the flow direction of heat and water molecules. Through multi-stage heat exchange (heat and moisture membrane, three-exchanger heat pump, and condensate spray), the air conditioner achieves seasonal operating mode control and management of indoor temperature and humidity. In the spring and autumn isothermal dehumidification mode, the compressor uses a reversing valve to form the second and third heat exchangers into a condenser, and the first heat exchanger into an evaporator. The humidifier sprays water mist to assist in cooling. The coordinated operation of the heat and moisture exchange core, the intake fan, and the exhaust fan achieves isothermal dehumidification of the outdoor fresh air before delivery into the room, while also achieving indoor ventilation. In the summer dehumidification and cooling mode and the winter humidification and heating mode, the operating mode of the heat exchanger and the spraying mode of the humidifier are changed to achieve corresponding temperature and humidity regulation functions to meet the needs of the indoor environment in different seasons.

[0068] The effect of this air conditioner is that on the one hand it can accurately realize multiple functions such as isothermal dehumidification, dehumidification cooling and humidification heating according to seasonal changes, provide a comfortable and stable temperature and humidity environment indoors, and improve living and working comfort; on the other hand, by reasonably controlling the coordinated work of various components, it optimizes energy utilization efficiency, reduces compressor energy consumption, and achieves energy-saving operation. At the same time, the system structure is compact, easy to install and maintain, and does not require the external unit structure of traditional air conditioners, further improving the stability and reliability of the system, and has good market application prospects and promotion value.

[0069] In order to make it easier for ordinary technicians in this field to understand the improvements of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and the above-mentioned embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the scope of protection of the present invention.

Claims

1. A fresh air air conditioner with multi-stage heat and moisture exchange, characterized in that: include: An outdoor fresh air inlet channel (1), at the end of which is provided an air inlet fan (3) for delivering outdoor fresh air into the room; An indoor return air exhaust duct (2), at the end of which an exhaust fan (4) is provided for sending the indoor return air outdoors; A heat and moisture exchange core (5) connects the outdoor fresh air inlet channel (1) and the indoor return air exhaust channel (2) to facilitate heat and moisture exchange between the outdoor fresh air and the indoor return air; The temperature and humidity regulating module comprises a first heat exchanger (6) and a second heat exchanger (7) arranged in an outdoor fresh air inlet passage (1), for successively performing heat exchange on the outdoor fresh air after passing through the heat and moisture exchange core (5), and further comprises a third heat exchanger (8) arranged in an indoor return air exhaust passage (2), for performing heat exchange on the indoor return air after passing through the heat and moisture exchange core (5); The humidification module comprises a first humidifier arranged in the outdoor fresh air inlet channel (1) for humidifying the first heat exchanger (6) and the second heat exchanger (7) as needed, and further comprises a second humidifier arranged in the indoor return air exhaust channel (2) for humidifying the third heat exchanger (8) as needed; A compressor (9) for delivering heat exchange medium to the first heat exchanger (6), the second heat exchanger (7), and the third heat exchanger (8); The compressor (9) is connected to the first heat exchanger (6) or the third heat exchanger (8) via a four-way reversing valve (10), and the compressor (9) is connected to the second heat exchanger (7) via a three-way reversing valve (11). A first expansion valve (12) is connected between the first heat exchanger (6) and the third heat exchanger (8), and a second expansion valve (13) is connected between the second heat exchanger (7) and the third heat exchanger (8). The following operating modes are implemented through control commands: Isothermal dehumidification mode: the compressor (9) is connected to the second heat exchanger (7) and the third heat exchanger (8), so that the second heat exchanger (7) and the third heat exchanger (8) both form condensers, and then the medium in the condenser enters the first heat exchanger (6) through the expansion valve, so that the first heat exchanger (6) forms an evaporator, the second humidifier is turned on to spray water mist on the third heat exchanger (8), the air inlet fan (3) and the exhaust fan (4) are turned on, and the outdoor fresh air enters the outdoor fresh air inlet channel (1), and the indoor return air enters the indoor return air exhaust channel (2), and then first passes through the heat and moisture exchanger. The core (5) performs heat and moisture exchange, and then the outdoor fresh air first passes through the evaporator formed by the first heat exchanger (6) to reduce the temperature and dehumidify, and then passes through the condenser formed by the second heat exchanger (7) to increase the temperature, and finally is sent into the room to realize isothermal dehumidification fresh air supply; at the same time, the indoor return air passes through the condenser formed by the third heat exchanger (8) to reduce the temperature of the medium in the condenser, and then is discharged to the outside in the form of high-temperature and high-humidity air, and the second humidifier sprays water mist on the third heat exchanger (8) to provide auxiliary cooling and pressure reduction for the medium in the third heat exchanger (8), so as to reduce the energy consumption of the compressor (9); Dehumidification and cooling mode: the compressor (9) is connected to the third heat exchanger (8) so that the third heat exchanger (8) forms a condenser, and then the medium in the condenser enters the first heat exchanger (6) and the second heat exchanger (7) through the expansion valve, so that the first heat exchanger (6) and the second heat exchanger (7) form an evaporator, the second humidifier is turned on to spray water mist on the third heat exchanger (8), the air inlet fan (3) and the exhaust fan (4) are turned on, and the outdoor fresh air enters the outdoor fresh air inlet channel (1), and the indoor return air enters the indoor return air exhaust channel (2). First, heat and moisture exchange is performed through the heat and moisture exchange core (5), and then the outdoor fresh air first passes through the evaporator formed by the first heat exchanger (6) and the second heat exchanger (7) to reduce the temperature and dehumidify, and then is sent into the room to realize the dehumidification and cooling fresh air supply; at the same time, the indoor return air passes through the condenser formed by the third heat exchanger (8) to reduce the temperature of the medium in the condenser, and then is discharged to the outside in the form of high-temperature and high-humidity air, and the second humidifier sprays water mist on the third heat exchanger (8) to provide auxiliary cooling and pressure reduction for the medium in the third heat exchanger (8), so as to reduce the energy consumption of the compressor (9); Humidification and heating mode: the compressor is connected to the first heat exchanger (6) and the second heat exchanger (7) so that the first heat exchanger (6) and the second heat exchanger (7) form a condenser, and then the medium in the condenser enters the third heat exchanger (8) through the expansion valve, so that the third heat exchanger (8) forms an evaporator, the first humidifier is turned on to spray water mist on the first heat exchanger (6) and the second heat exchanger (7), the air inlet fan (3) and the exhaust fan (4) are turned on, and the outdoor fresh air enters the outdoor fresh air inlet channel (1), and the indoor return air enters the indoor return air exhaust channel (2), and then first passes through the heat and moisture exchange core (5) for heat and moisture exchange, and then the outdoor fresh air first passes through the condenser formed by the first heat exchanger (6) and the second heat exchanger (7) to increase the temperature, and is humidified under the action of the water mist sprayed by the first humidifier, and then sent into the room to realize the humidification and heating fresh air supply; at the same time, the indoor return air passes through the evaporator formed by the third heat exchanger (8) for heat exchange and cooling, and then is discharged to the outside in the form of low-temperature dry air.

2. The fresh air air conditioner with multi-stage heat and moisture exchange according to claim 1, characterized in that: The first humidifier and the second humidifier each include a set of humidifying mechanisms, the humidifying mechanisms including a water receiving tray (14) arranged below the corresponding heat exchanger and a spray nozzle (15) above the same, the spray nozzle (15) being connected to the water receiving tray (14) via a water suction pipe (16), the water suction pipe (16) being provided with a Bernoulli valve (17), one end of the Bernoulli valve (17) being provided with an air pump (18), and starting the air pump (18) allows air to pass through the Bernoulli valve (17) to generate negative pressure, thereby allowing the water suction pipe (16) to suck water in the water receiving tray (14) into the Bernoulli valve (17) and mix the water with air before spraying the water out through the spray nozzle (15).

3. The fresh air air conditioner with multi-stage heat and moisture exchange according to claim 2, characterized in that: The water receiving tray (14) is connected to an automatic water replenishment valve (19), and the automatic water replenishment valve (19) is provided with a normally closed two-way electromagnetic valve (24) for externally receiving clean water to replenish water to the water receiving tray (14).

4. The fresh air air conditioner with multi-stage heat and moisture exchange according to claim 3, characterized in that: The bottom of the water receiving tray (14) is provided with a normally open electric drain valve (20), and the top is also provided with an overflow port (21); the inner wall surface of the water receiving tray (14) is also provided with a layer of antibacterial copper mesh.

5. The fresh air air conditioner with multi-stage heat and moisture exchange according to claim 2, characterized in that: The first heat exchanger (6), the second heat exchanger (7) and the third heat exchanger (8) are all arranged in an inclined shape along the height direction to increase the windward surface of the heat exchange and the contact area with the water mist sprayed by the spray nozzle (15).

6. The fresh air air conditioner with multi-stage heat and moisture exchange according to claim 1, characterized in that: The inlet of the outdoor fresh air inlet channel (1) and the inlet of the indoor return air exhaust channel (2) are both provided with filter cotton (22).

7. The fresh air air conditioner with multi-stage heat and moisture exchange according to any one of claims 1 to 6, characterized in that: The invention also includes a box body (23), wherein the outdoor fresh air inlet channel (1) and the indoor return air exhaust channel (2) are independently arranged in the box body (23), the inlet of the outdoor fresh air inlet channel (1) is located at the rear of the right end of the box body (23), the outlet of the outdoor fresh air inlet channel (1) is located at the front of the left end of the box body (23), the inlet of the indoor return air exhaust channel (2) is located at the front of the right end of the box body (23), and the outlet of the indoor return air exhaust channel (2) is located at the rear of the left end of the box body (23), and the front of the box body (23) is installed close to the indoor side, and the rear is installed close to the outdoor side.

8. A multi-stage heat and moisture exchange fresh air air conditioning multi-connected system, characterized by: The invention comprises a plurality of boxes (23) as claimed in claim 7 and a compressor (9), wherein the inlet of the outdoor fresh air inlet channel (1) and the outlet of the indoor return air exhaust channel (2) of each box (23) are connected to the outdoor atmosphere through independent pipelines, and the heat exchanger inside each box (23) is connected to the compressor (9) in parallel.

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