Multi-stage heat and humidity exchange fresh air conditioner and control method

Abstract

The invention discloses a multistage heat and humidity exchange fresh air conditioner and a control method, and relates to the technical field of air conditioners. Indoor exhaust air and outdoor fresh air are subjected to total heat exchange through the hot and wet film, then the communication state between the compressor and the heat exchangers and the spraying state of the humidifier are controlled, the heat and water molecule flowing direction is efficiently controlled in an energy-saving mode, and through the multi-stage heat exchange (the hot and wet film, the three-heat-exchanger heat pump and condensate water spraying) mode, the heat exchange efficiency is improved. The indoor environment temperature and humidity are controlled and managed under the condition that working condition modes in different seasons are switched. In the isothermal dehumidification mode, the compressor enables the second heat exchanger and the third heat exchanger to form a condenser through a reversing valve, the first heat exchanger forms an evaporator, cooling is assisted by spraying water mist through a humidifier, and outdoor fresh air is sent into a room after isothermal dehumidification and the effect of indoor air exhaust is achieved through cooperative work of a heat and humidity exchange core, an air inlet fan and an air exhaust fan; and the working state of the heat exchanger and the spraying condition of the humidifier are changed in the dehumidification refrigeration and heating humidification modes, so that temperature and humidity adjustment is realized.

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, the requirements for indoor air environment comfort are also increasing. At present, traditional air conditioners mainly focus on temperature regulation and lack effective humidity regulation function. Although some high-end air conditioners have a certain dehumidification capacity, they are usually simple dehumidification attached to the cooling mode, which cannot achieve accurate isothermal dehumidification, and the dehumidification effect is not good in low temperature and high humidity environments. As for the humidification function, most air conditioners are powerless and need to rely on additional humidification equipment, and cannot provide users with a one-stop temperature and humidity regulation solution.

[0003] As for some simple dehumidification or humidification equipment on the market, for example, dehumidifiers use the refrigeration principle 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. They not only take up space, but also require manual intervention during use, such as regular watering and cleaning, which is not convenient to use. In addition, these devices often find it difficult to take into account the precise control of temperature when adjusting humidity, and cannot achieve coordinated adjustment of indoor temperature and humidity, resulting in the indoor environmental comfort level still being less than ideal.

[0004] In addition, the indoor temperature and humidity requirements vary greatly in different seasons. Although the existing air conditioners can reduce humidity to a certain extent during cooling in the summer, they often cause the indoor temperature to be too low, making the human body feel uncomfortable; and during heating in the winter, they cannot effectively solve the problem of indoor air dryness, and may even aggravate the dryness, failing to meet the user's demand for an ideal indoor environment in all seasons. If additional existing dehumidification or humidification equipment is purchased for use, since they are independent of the air conditioner, additional energy will be consumed when each is running. For example, in the summer when cooling and dehumidification are required at the same time, the air conditioner and dehumidifier are operated separately, which not only increases energy consumption, but may also lead to poor indoor temperature and humidity regulation due to the lack of coordination between the equipment, 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: The outdoor fresh air inlet channel has an air inlet fan at the end thereof for delivering outdoor fresh air into the room; An indoor return air exhaust passage, at the end of which an exhaust fan is provided for sending indoor return air to the outdoors; A heat and moisture exchange core is connected to 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; The temperature and humidity adjustment module includes a first heat exchanger and a second heat exchanger arranged in the outdoor fresh air inlet passage, 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 passage, which is used to perform heat exchange on the indoor return air after passing through the heat and moisture exchange core; 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; The compressor is used to transport the heat exchange medium to the first heat exchanger, the second heat exchanger and the third heat exchanger.

[0007] 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.

[0008] 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 via a water suction pipe, the water suction pipe being provided with a Bernoulli valve, one end of the Bernoulli valve being provided with an air pump, and starting the air pump allows air to pass through the Bernoulli valve to generate negative pressure, so that the water suction pipe sucks the water in the water receiving pan into the Bernoulli valve and mixes the water with the air before spraying it out through the spray nozzle.

[0009] More preferably, the water receiving tray is connected to an automatic water replenishment valve, and the automatic water replenishment valve is provided with a normally closed two-way solenoid valve for externally connecting clean water to replenish water to the water receiving tray.

[0010] More preferably, a normally open electric drain valve is provided at the bottom of the water receiving tray, and an overflow port is also provided at the top; and a layer of antibacterial copper mesh is also provided on the inner wall surface of the water receiving tray.

[0011] 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.

[0012] More preferably, both the entrance of the outdoor fresh air inlet channel and the entrance of the indoor return air exhaust channel are provided with filter cotton.

[0013] More preferably, it also includes a box body, wherein 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, 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.

[0014] In addition, the present invention also provides a multi-stage heat and moisture exchange fresh air air conditioning multi-connected system, which includes a plurality 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.

[0015] In addition, the present invention also provides a control method for the above-mentioned fresh air air conditioner with multi-stage heat and moisture exchange, which implements the following working mode through control instructions: 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 inlet 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, and then first passes through the heat and moisture exchange core for heat and moisture exchange, and then the outdoor fresh air first 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, and 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.

[0016] 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 inlet 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 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 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 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 to provide auxiliary cooling and pressure reduction for the medium in the third heat exchanger to reduce the energy consumption of the compressor.

[0017] 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 inlet 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, and then first passes through the heat and moisture exchange core for heat and moisture exchange, 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 is cooled by the evaporator formed by the third heat exchanger through heat exchange, and then discharged to the outside in the form of low-temperature dry air.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Real-time monitoring of indoor temperature and humidity through sensors, combined with preset target parameters, automatically control the operating frequency of compressors and fans. The combination of multiple heat exchangers in the temperature and humidity control module and the humidification module can accurately exchange heat and humidify outdoor fresh air and indoor return air, efficiently and energy-savingly control the flow direction of heat and water molecules, and realize multi-stage heat exchange (heat and moisture exchange core, heat exchanger, condensation water spray) to meet the needs of precise temperature and humidity regulation in different seasons and environments. Isothermal dehumidification can be achieved in spring and autumn, dehumidification and cooling can be achieved in summer, and humidification and heating can be achieved in winter, which not only provides a comfortable and stable temperature and humidity environment for the room, but also ensures the continuous renewal of indoor air, effectively discharges indoor dirty air, introduces outdoor fresh air, improves indoor air quality, and improves people's living and working comfort.

[0019] 2. By setting up a heat and moisture exchange core, outdoor fresh air and indoor return air can exchange heat and moisture, effectively recovering the cold or heat and water vapor in the indoor return air, reducing dependence on external energy, improving energy utilization efficiency, and only requiring two low-energy fans 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 and cooling mode, a humidifier can be used to provide auxiliary cooling for the medium in the condenser, thereby enabling the compressor to reduce pressure and improve its capacity and energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure in the embodiment; Figure 2 is a schematic structural diagram of a first humidifier in the embodiment; Figure 3 It is a schematic diagram of the principle of the isothermal dehumidification mode in the embodiment; Figure 4 Schematic diagram of the principle of the dehumidification and cooling mode in the embodiment; Figure 5 This is a schematic diagram of the principle of the humidification and heating mode in the embodiment; Figure 6 Schematic diagram of a fresh air air conditioning multi-connected system with multi-stage heat and moisture exchange in an embodiment; Figure 7 Enthalpy-humidity diagram of air conditioning wet air process in summer and winter in the embodiment; Figure 8 Enthalpy-humidity diagram of the isothermal dehumidification process of air conditioning in spring in the embodiment.

[0021] In the figure: 1. Outdoor fresh air inlet channel; 2. Indoor return air exhaust channel; 3. Inlet fan; 4. Exhaust fan; 5. Heat and moisture exchange core; 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. Water tray; 15. Spray nozzle; 16. Water 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. Box; 24. Normally closed two-way solenoid valve. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0023] It should be noted in advance that, in the present invention, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the present invention, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact through another feature between them.

[0024] like Figure 1 As shown, a fresh air air conditioner with multi-stage heat and moisture exchange comprises: 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.

[0025] The indoor return air exhaust passage 2 is provided with an exhaust fan 4 at its end for sending the indoor return air to the outside.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] The compressor 9 is used to deliver heat exchange medium to the first heat exchanger 6, the second heat exchanger 7 and the third heat exchanger 8. In addition, the indoor temperature and humidity can be monitored by sensors, and the operating frequency of the compressor and the fan can be automatically controlled in combination with preset target parameters to improve the intelligent control effect of the equipment.

[0030] 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.

[0031] In this embodiment, the first humidifier and the second humidifier both 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 arranged below the corresponding heat exchanger and a spray nozzle 15 above the water receiving pan 14. The spray nozzle 15 is connected to the water receiving pan 14 through a water suction pipe 16. The water suction pipe 16 is equipped with a Bernoulli valve 17. An air pump 18 is arranged at one end of the Bernoulli valve 17. Starting the air pump 18 allows air to pass through the Bernoulli valve 17 to generate negative pressure, so that the water suction pipe 16 sucks the water in the water receiving pan 14 into the Bernoulli valve 17 and mixes it with air before spraying it out through the spray nozzle 15. By utilizing the principle of generating negative pressure by the Bernoulli valve 17, the water is sucked in and mixed with air and sprayed out through the power provided by the air pump 18. Compared with traditional humidification methods, such as electrode humidification, the energy consumption is lower, the energy consumption during the operation of the air conditioner is reduced, and the energy saving effect is good. In addition, the water in the water suction pipe 16 has been mixed with air in advance, which makes the water mist sprayed from the spray nozzle 15 more dispersed, which is conducive to improving the heat conduction performance.

[0032] 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, so that the compressor can be depressurized and its capacity and energy efficiency can be improved. This is because water has a large specific heat capacity and can absorb more heat. Spraying water mist on the surface of the condenser will absorb part of the heat released during the condensation of the refrigerant and evaporate, thereby enhancing the heat dissipation effect of the condenser. Then, due to the improved heat dissipation effect of the condenser, the temperature of the refrigerant liquid after condensation will decrease, and the condensation pressure will also decrease accordingly. According to the principle of the refrigeration cycle, the exhaust pressure of the compressor is equal to the condensation pressure. When the condensation pressure decreases, the exhaust pressure of the compressor will also decrease. When the exhaust pressure of the compressor decreases, the compression ratio of the compressor will also decrease. The compression ratio is the ratio of the compressor exhaust pressure to the suction pressure. A decrease in the compression ratio means that the work required by the compressor to compress the refrigerant vapor will be reduced. This is conducive to improving the capacity of the compressor because the compressor can compress more refrigerant vapor at the same power. At the same time, since the power consumption of the compressor is reduced, and the cooling capacity will increase due to the increase in the circulation volume of the refrigerant, the energy efficiency ratio will be improved.

[0033] Furthermore, the water receiving tray 14 is connected to an automatic water replenishment valve 19, which is provided with a normally closed two-way electromagnetic valve 24 for externally receiving purified water to replenish water to the water receiving tray 14. A normally open drain electric valve 20 is provided at the bottom of the water receiving tray 14, and an overflow port 21 is also provided at the top; a layer of antibacterial copper mesh is also provided on the inner wall of the water receiving tray 14.

[0034] 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 .

[0035] Considering the quality of the introduced fresh air and the service life of the equipment, filter cotton 22 is provided at the entrance of the outdoor fresh air inlet channel 1 and the entrance of the indoor return air exhaust channel 2. The filter cotton 22 can preliminarily filter the air entering the air conditioning system, intercept dust, pollen, hair and other impurities in the air, prevent these impurities from entering the air conditioner, avoid pollution and blockage of subsequent heat and moisture exchange, humidification and other components, and ensure the normal operation and service life of the air conditioning system. Then, by filtering out harmful impurities in the air, the fresh air entering the room and the circulating return air are cleaner, which helps to improve the indoor air quality and provide users with a healthier and more comfortable living and working environment, which is of great significance especially for people with allergies or places with high requirements for air quality.

[0036] When the fresh air air conditioner with multi-stage heat and moisture exchange is installed, a box 23 can be set, and the outdoor fresh air inlet channel 1 and the indoor return air exhaust channel 2 are independently set in the box 23. The inlet of the outdoor fresh air inlet channel 1 is located at the rear of the right end of the box 23, and the outlet of the outdoor fresh air inlet channel 1 is located at the front of the left end of the box 23. The inlet of the indoor return air exhaust channel 2 is located at the front of the right end of the box 23, and the outlet of the indoor return air exhaust channel 2 is located at the rear of the left end of the box 23. The front of the box 23 is installed close to the indoor side, and the rear is installed close to the outdoor side. This makes the overall structure of the air conditioner more compact, can complete the processing of fresh air and return air in a limited space, improves space utilization, and is easy to install in different places, especially suitable for indoor environments with limited space. At the same time, it also facilitates the installation and later maintenance of the air conditioner, and maintenance personnel can inspect and maintain the indoor components of the air conditioner on the indoor side.

[0037] 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-connection system, such as Figure 6 As shown, the system specifically includes a plurality of 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, and the heat exchanger inside each box 23 is connected to the compressor 9 in parallel. This allows the entire system to be equipped with only one compressor 9, greatly reducing the number and energy consumption of compressors, reducing the operating cost of the entire system, improving energy utilization efficiency, achieving energy-saving operation, and meeting modern environmental protection and energy-saving requirements.

[0038] 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 large floor space occupied by the indoor and outdoor units in the traditional multi-connected air-conditioning system 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 pipelines. During installation, it is only necessary to connect the corresponding air outlets 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 difficulty and cost of installation and improves the installation efficiency.

[0039] 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 of wind, sun, rain, etc. faced by the external unit of the traditional air-conditioning system when operating in harsh outdoor environments, further extending the service life of the compressor 9, reducing the maintenance cost and failure rate of the system, and ensuring the stable operation of the entire wet fresh air air conditioning multi-connected system. In addition, without the external unit structure in the traditional air-conditioning system, the appearance of the building can be made neater and more beautiful, and the overall beauty of the building will not be destroyed due to the installation of the external unit, which meets the requirements of modern buildings for appearance design, and is particularly suitable for commercial buildings, residential areas and other places that have high requirements for building appearance.

[0040] 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 implementation mode mainly implements the following working mode through control instructions: 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 end of the third heat exchanger 8 (condenser) through the second expansion valve 13 and then enters the first heat exchanger 6 through the first expansion valve 12, 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), 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 performs heat and moisture exchange to reduce the humidity of outdoor fresh air. Then, the outdoor fresh air first passes through the evaporator formed by the first heat exchanger 6 to reduce the temperature and further 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, and 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, and then is discharged to the outside in the form of high-temperature and high-humidity air. In 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, so as to reduce 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; among which: cop =(h 送 -h 进 )×350×1.2 / 3600 / 0.7 =(65-37.1)×350×1.2 / 3600 / 0.7=4.65.

[0041] Summer dehumidification and 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 enters the first heat exchanger 6 and the second heat exchanger 7 through the first expansion valve 12 and the second expansion valve 13 respectively, 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, 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. After that, the heat and moisture exchange is first performed through the heat and moisture exchange core 5 to reduce the humidity of the outdoor fresh air, and then the outdoor fresh air passes through the first The evaporator formed by the heat exchanger 6 and the second heat exchanger 7 lowers the temperature and dehumidifies, and then is sent into the room to realize the supply of dehumidified and refrigerated fresh air, while the medium in the first heat exchanger 6 (evaporator) returns to the compressor 9 through the four-way reversing valve 10, and the medium in the second heat exchanger 7 (evaporator) returns to the compressor 9 through the three-way reversing valve 11; 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. In 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, so as to reduce 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 0.76KW; among which: eer =(h 进 -h 送 )×350×12 / 3600 / 0.76 =(107.1-38.5)×350×1.2 / 3600 / 0.76=10.53.

[0042] 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 is connected 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 the internal return air enters the indoor return air exhaust channel 2, it first passes through the heat and moisture exchange core 5 to exchange heat and moisture, increasing the humidity of the outdoor fresh air. Then the outdoor fresh air first passes through the condenser formed by the first heat exchanger 6 (condenser) and the second heat exchanger 7 (condenser) to increase the temperature, and is humidified under the action of the spray mist of the first humidifier, and then sent into the room to realize the humidification and heating fresh air supply, while 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 then is discharged to the outside in the form of 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: cop=(h 送 -h 进 )×350×1.2 / 3600 / 0.76 =(57.5-2.7)×350×1.2 / 3600 / 0.76=8.41.

[0043] The multi-stage heat and moisture exchange fresh air air conditioner of the present invention exchanges the indoor exhaust air with the outdoor fresh air through the heat and moisture film inside the heat and moisture exchange core, and then controls the connection state between the compressor and each heat exchanger and the spray state of the humidifier, so as to efficiently and energy-savingly control the flow direction of heat and water molecules, and realizes the control and management of the indoor environmental temperature and humidity under the switching of the working mode in different seasons through the multi-stage heat exchange (heat and moisture film, three heat exchanger heat pump, condensed water spray). In the isothermal dehumidification mode in spring and autumn, the compressor uses the reversing valve to make the second and third heat exchangers form a condenser, and the first heat exchanger forms an evaporator, and sprays water mist through the humidifier to assist in cooling. Combined with the coordinated work of the heat and moisture exchange core, the air inlet fan and the exhaust fan, the outdoor fresh air is isothermally dehumidified and sent indoors, and the indoor exhaust effect is achieved at the same time; in the summer dehumidification and cooling mode and the winter humidification and heating mode, the working state of the heat exchanger and the spray condition of the humidifier are changed to realize the corresponding temperature and humidity adjustment function to meet the needs of the indoor environment in different seasons.

[0044] 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 has a compact structure, is easy to install and maintain, and does not require the external unit structure of traditional air conditioners, which further improves the stability and reliability of the system and has good market application prospects and promotion value.

[0045] In order to make it easier for ordinary technicians in the 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 protection scope 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 passage (2), at the end of which is provided an exhaust fan (4) for sending the indoor return air outdoors; A heat and moisture exchange core (5) is connected to 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 an outdoor fresh air inlet passage (1) for humidifying the first heat exchanger (6) and the second heat exchanger (7) as required, and further comprises a second humidifier arranged in an indoor return air exhaust passage (2) for humidifying the third heat exchanger (8) as required; The compressor (9) is used to transport heat exchange medium to the first heat exchanger (6), the second heat exchanger (7) and the third heat exchanger (8).

2. The fresh air air conditioner with multi-stage heat and moisture exchange according to claim 1, characterized in that: The compressor (9) is connected to the first heat exchanger (6) or the third heat exchanger (8) via a four-way reversing valve (10); 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).

3. 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 comprise a set of humidifying mechanisms, the humidifying mechanisms comprising a water receiving tray (14) arranged below the corresponding heat exchanger and a spray nozzle (15) above the corresponding heat exchanger, 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 when the air pump (18) is activated, air can pass through the Bernoulli valve (17) to generate negative pressure, so that the water suction pipe (16) can suck water in the water receiving tray (14) into the Bernoulli valve (17), and the water is mixed with air and then sprayed out via the spray nozzle (15).

4. The fresh air air conditioner with multi-stage heat and moisture exchange according to claim 3 is 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).

5. The fresh air air conditioner with multi-stage heat and moisture exchange according to claim 4 is characterized in that: The bottom of the water receiving tray (14) is provided with a normally open electric drainage 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.

6. The fresh air air conditioner with multi-stage heat and moisture exchange according to claim 3 is 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 in 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).

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

8. The fresh air air conditioner with multi-stage heat and moisture exchange according to any one of claims 1 to 7, characterized in that: It also comprises 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 part of the box body (23) is installed close to the indoor side, and the rear part is installed close to the outdoor side.

9. A multi-stage heat and moisture exchange fresh air air conditioning multi-connection system, characterized in that: The invention comprises a plurality of boxes (23) as claimed in claim 8 and a compressor (9), wherein the inlet of the outdoor fresh air inlet passage (1) and the outlet of the indoor return air exhaust passage (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.

10. A control method for a fresh air air conditioner with multi-stage heat and moisture exchange according to claim 1, characterized in that: 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 dehumidified 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 supply of dehumidified and refrigerated fresh air; 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 is sent into the room to realize the supply of humidification and heating fresh air; 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.

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