A multi-evaporator stacked low dew point frost-free air conditioning system

Abstract

The present invention discloses a multi-evaporator stacked low dew point frost-free air conditioning system, which belongs to the field of air conditioning evaporators, including a compressor, an expansion valve, a condenser and an evaporator. The condenser and the evaporator are both provided with an air inlet and an air outlet. The condenser and the evaporator are both equipped with fans. The condenser is equipped with a condenser coil, and the evaporator is equipped with an evaporator coil. The compressor, the condenser coil, the expansion valve and the evaporator coil are connected in sequence through a conduit. In the cooling mode, the evaporator refrigeration temperature can be made below the dew point by spraying a dehumidification solution on the evaporator, thereby avoiding the problem of frost on the evaporator in the cooling mode. The low-temperature dehumidification solution after spraying flows into the casing to cool the condenser coil to improve the cooling efficiency of the air conditioner. The heating of the dehumidification solution by the condenser coil can also play a primary concentration role to remove moisture in the dehumidification solution.

Description

Technical Field

[0001] The invention relates to the field of air-conditioning evaporators, and more particularly to a multi-evaporator stacked low dew point frost-free air-conditioning system. Background Art

[0002] The stacked evaporator is usually composed of two aluminum plates punched into complex shapes and welded together to form a refrigerant channel. A wavy heat dissipation fin is sandwiched between each two combined channels. Its working principle is that after the liquid refrigerant enters the evaporator, it flows in the narrow channel and evaporates to absorb heat, thereby cooling the air passing through the evaporator. The blower blows out the cooled air to reduce its air temperature.

[0003] When the cascade evaporator is cooling, if the humidity in the air is high, the moisture in the air condenses on the cascade evaporator when the air passes through the cascade evaporator. In severe cases, frost will condense on the cascade evaporator. The formation of frost will hinder the heat exchange between the evaporator and the air, which is like putting a layer of "cotton jacket" on the evaporator, making it difficult to absorb heat effectively, resulting in a gradual deterioration of the cooling effect.

[0004] To solve the above problems, a Chinese patent discloses a humid enthalpy frost-free air conditioner with application number 2017204568126. The public document sprays a frost-free solution onto the heat exchanger to prevent frost on the fin surface. The frost-free solution is diluted, and the diluted frost-free solution needs to be heated by a solution heat exchanger to achieve concentration. The additional equipment will cause the refrigeration system to consume more electricity, resulting in increased power consumption of the refrigeration system. Summary of the invention

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a multi-evaporator stacked low dew point frost-free air-conditioning system, which can achieve the evaporator cooling temperature below the dew point by spraying dehumidification solution on the evaporator in cooling mode, thereby avoiding the problem of frost on the evaporator in cooling mode. The low-temperature dehumidification solution after spraying flows into the casing to cool the condenser coil to improve the cooling efficiency of the air conditioner. The heating of the dehumidification solution by the condenser coil can also play a role of primary concentration to remove moisture in the dehumidification solution for recycling.

[0006] To solve the above problems, the present invention adopts the following technical solutions.

[0007] A multi-evaporator stacked low dew point frost-free air conditioning system, comprising a compressor, an expansion valve, a condenser and an evaporator, wherein the condenser and the evaporator are both provided with an air inlet and an air outlet, the condenser and the evaporator are both provided with fans, the condenser is provided with a condenser coil, the evaporator is provided with an evaporator coil, the compressor, the condenser coil, the expansion valve and the evaporator coil are connected in sequence through a conduit to form a refrigeration device;

[0008] A spray plate is arranged above the evaporator coil, and the spray plate is used to spray the dehumidification solution. A liquid receiving box is arranged below the evaporator coil. The spray plate and the liquid receiving box are connected by a connecting pipe, and the connecting pipe is also connected to a concentration component and a heat exchange component.

[0009] The concentration component is used to remove moisture from the dehumidification solution;

[0010] The heat exchange component is used to perform heat exchange on the dehumidification solution.

[0011] Furthermore, the lower end of the liquid receiving box is connected to the collecting box through a connecting pipe and is connected to the water inlet end of the collecting box. The water outlet end of the collecting box is connected to the first water pump through a connecting pipe and is connected to the water inlet of the first water pump. The water outlet end of the first water pump is connected to the spray plate through a connecting pipe.

[0012] Further, the concentration assembly includes a primary concentration assembly and a secondary concentration assembly, and the primary concentration assembly includes a sleeve;

[0013] The sleeve is arranged on the outside of the condenser coil, the water outlet of the first water pump is connected to the water inlet end of the sleeve through a connecting pipe, the water outlet end of the sleeve is connected to a primary concentration box through a connecting pipe, an exhaust assembly is installed on the upper end of the primary concentration box, the exhaust assembly is used to discharge water vapor into the air, and the interior of the primary concentration box is interconnected with the spray plate through a connecting pipe.

[0014] Furthermore, the exhaust assembly includes an air duct, the upper end of the first-level concentration box is connected to the air duct with the upper end sealed and the lower end open, a connecting column is arranged inside the air duct, a space for gas flow is left between the inner wall of the air duct and the outer wall of the connecting column, the lower end of the connecting column is fixedly connected to a floating plate, the floating plate is arranged in the first-level concentration box, the floating plate can block the lower end opening of the air duct, a sealing column is fixedly connected to the side surface of the connecting column near the upper end, an exhaust pipe is arranged on the left end surface of the connecting column, the left end surface of the connecting column can be arranged in contact with the exhaust pipe, the left end of the exhaust pipe passes through the air duct and extends to the outside, a spring is sleeved on the side surface of the connecting column and the exhaust pipe, the right end of the spring is fixedly connected to the connecting column, and the left end of the spring is fixedly connected to the inner wall of the exhaust pipe.

[0015] Furthermore, the secondary concentration component includes a secondary concentration tank, the primary concentration box is arranged in the secondary concentration tank, the bottom wall of the primary concentration box is penetrated by a plurality of groups of evenly distributed liquid flow holes, the upper end of the air guide pipe penetrates the upper top wall of the secondary concentration tank and extends to the outside, the left and right sides of the inner wall of the secondary concentration tank are alternately connected with inclined plates, the inclined plates are made of heat-conducting materials, an electric heating wire is installed inside the inclined plates, the inclined plates are connected with air pipes with upper and lower openings, the air pipes are distributed in multiple groups, the lower end of the secondary concentration tank is connected to a second water pump through a connecting pipe, and the water outlet of the second water pump is connected to the spray plate through a connecting pipe.

[0016] Furthermore, a plurality of groups of evenly distributed air guide holes are provided on the side wall of the air guide pipe near the lower end, and the air guide holes are located inside the secondary concentration tank.

[0017] Furthermore, a heat exchange coil is connected to the connecting pipe between the second water pump and the spray plate. The heat exchange coil is buried deep underground and is made of heat-conducting metal material.

[0018] Furthermore, a concentration sensor is installed near the lower position of the inner wall of the secondary concentration tank, and the concentration sensor is used to detect the concentration of the dehumidification solution. A controller is installed in the condenser, and the controller can control the heat generated by the heating wire. The controller is electrically connected to the concentration sensor.

[0019] Furthermore, a first liquid sensor is installed on the upper half of the inner wall of the collection box, and a second liquid sensor is installed near the middle of the inner wall of the secondary concentration tank. The controller is electrically connected to the first liquid sensor and the second liquid sensor, and the controller can control the water output of the first water pump and the second water pump.

[0020] Furthermore, a rubber sheet is provided between the sealing column and the exhaust pipe, and the rubber sheet and the sealing column are fixedly connected.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) In the cooling mode, this solution sprays a dehumidification solution on the evaporator to keep the evaporator cooling temperature below the dew point, thereby avoiding the problem of frost on the evaporator in the cooling mode. The low-temperature dehumidification solution after spraying flows into the casing to cool the condenser coil, thereby improving the cooling efficiency of the air conditioner and reducing the power consumption of the refrigeration device. The heating of the dehumidification solution by the condenser coil can also play a primary concentration role to remove moisture in the dehumidification solution for recycling.

[0023] (2) In the heating mode, the dehumidification solution heated by the evaporator coil will flow into the sleeve to heat the condenser coil, thereby reducing heat waste and improving the heating efficiency of the air conditioner. At the same time, it can also avoid the problem of condensation and frost on the condenser in the heating mode.

[0024] (3) In the summer, after the dehumidification solution is heated and concentrated by the condenser coil, the concentrated dehumidification solution will first pass through the buried heat exchange coil to exchange heat with the ground when it flows down from the spray plate, thereby lowering the temperature of the dehumidification solution. The low-temperature dehumidification solution is sprayed onto the evaporator coil, ensuring the cooling effect of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 is a cross-sectional view of the sleeve of the present invention;

[0027] Figure 3 This is a diagram showing the internal structure of the secondary concentration tank of the present invention;

[0028] Figure 4 For the present invention Figure 3 Magnified view of point A in the middle

[0029] Figure 5 The figure is a disassembled view of the sealing column, spring and exhaust pipe of the present invention.

[0030] Description of the numbers in the figure:

[0031] 1. Compressor; 2. Condenser coil; 3. Expansion valve; 4. Evaporator coil; 5. Condenser; 6. Evaporator; 7. Liquid receiving box; 8. Collecting box; 9. First water pump; 10. Casing; 11. Secondary concentration tank; 12. Second water pump; 13. Heat exchange coil; 14. Spray plate; 15. First liquid sensor; 16. Inclined plate; 17. Air pipe; 18. Concentration sensor; 19. Second liquid sensor; 20. Rubber sheet; 21. Air guide hole; 112. First concentration box; 113. Liquid flow hole; 114. Floating plate; 115. Connecting column; 116. Air guide pipe; 117. Sealing column; 118. Spring; 119. Exhaust pipe. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0033] See also Figure 1 to Figure 2 A multi-evaporator stacked low dew point frost-free air conditioning system comprises a compressor 1, an expansion valve 3, a condenser 5 and an evaporator 6, an air inlet and an air outlet are provided on the condenser 5 and the evaporator 6, fans are installed in the condenser 5 and the evaporator 6, a condenser coil 2 is installed in the condenser 5, an evaporator coil 4 is installed in the evaporator 6, the compressor 1, the condenser coil 2, the expansion valve 3 and the evaporator coil 4 are connected in sequence through a conduit to form a refrigeration device;

[0034] A spray plate 14 is arranged above the evaporator coil 4, and the spray plate 14 is used to spray the dehumidification solution. A liquid receiving box 7 is arranged below the evaporator coil 4. The spray plate 14 and the liquid receiving box 7 are connected by a connecting pipe, and a concentration component and a heat exchange component are also connected to the connecting pipe;

[0035] The concentration component is used to remove water from the dehumidification solution;

[0036] The heat exchange component is used for exchanging heat with the dehumidification solution;

[0037] The lower end of the liquid receiving box 7 is connected to the collecting box 8 through a connecting pipe, and is connected to the water inlet end of the collecting box 8. The water outlet end of the collecting box 8 is connected to the first water pump 9 through a connecting pipe, and is connected to the water inlet of the first water pump 9. The water outlet end of the first water pump 9 is connected to the spray plate 14 through a connecting pipe.

[0038] When in use, the evaporator 6 is installed indoors and the condenser 5 is installed outdoors. In summer, the indoor cooling mode is turned on, and the refrigerant circulates in the air-conditioning system. First, the low-temperature and low-pressure refrigerant is sucked into the compressor 1. After being compressed by the compressor 1, its temperature and pressure increase and become a high-temperature and high-pressure gas. The high-temperature and high-pressure refrigerant gas enters the condenser 5. In the condenser 5, the refrigerant gas releases heat to the outdoor air by heat dissipation (usually by blowing the outdoor air with a fan to accelerate the heat dissipation), and condenses into a high-pressure liquid. In this process, the condenser 5 is heating because it releases heat to the outdoor environment. The high-pressure liquid refrigerant enters the evaporator 6 through the expansion valve 3. At this time, the pressure of the refrigerant drops sharply, and part of the refrigerant vaporizes and absorbs heat, thereby reducing the surface temperature of the evaporator 6. In this process, the evaporator 6 is cooling because it absorbs the indoor heat. It can be simply understood that when the air conditioner is in the cooling mode, the evaporator 6 is cooling and the condenser 5 is heating;

[0039] When the air conditioner is in heating mode, the functions of the evaporator 6 and the condenser 5 are opposite to those in cooling mode. The condenser 5 of the outdoor unit absorbs outdoor heat and releases the heat into the room through the evaporator 6 of the indoor unit, thereby heating the indoor air.

[0040] When the air conditioner is in cooling mode, if there is a lot of moisture in the air and the cooling temperature of the evaporator 6 is below the dew point, the moisture in the air will easily condense on the evaporator coil 4, and in severe cases, frost will form. The thermal conductivity of frost is much lower than that of metal, so its presence will greatly increase the thermal resistance between the evaporator 6 and the external environment, making heat transfer more difficult, which will cause negative effects on the air conditioner's cooling performance, energy consumption, and equipment life.

[0041] The present invention sprays a dehumidification solution on the spray plate 14 above the evaporator coil 4. The dehumidification solution can be a calcium chloride solution, a lithium chloride solution, etc. The dehumidification solution absorbs moisture in the air, thereby reducing the moisture content in the air and making the air environment below the low dew point. The dehumidification solution after absorbing water will fall into the liquid receiving box 7 and flow into the collecting box 8 along the connecting pipe. The first water pump 9 extracts the diluted dehumidification solution in the collecting box 8 to the concentrating component, and the excess moisture in the dehumidification solution is removed by the concentrating component. The concentrated dehumidification solution finally flows into the spray plate 14 and falls to perform dehumidification work, thereby avoiding the problem of frost on the evaporator 6 in the cooling mode.

[0042] like Figures 1 to 5 As shown, the concentration assembly includes a primary concentration assembly and a secondary concentration assembly, and the primary concentration assembly includes a sleeve 10;

[0043] The sleeve 10 is sleeved on the outside of the condenser coil 2, the water outlet of the first water pump 9 is connected to the water inlet end of the sleeve 10 through a connecting pipe, the water outlet end of the sleeve 10 is connected to a primary concentration box 112 through a connecting pipe, an exhaust assembly is installed on the upper end of the primary concentration box 112, the exhaust assembly is used to discharge water vapor into the air, and the interior of the primary concentration box 112 is interconnected with the spray plate 14 through a connecting pipe;

[0044] The exhaust assembly includes an air guide tube 116. The upper end of the first-stage concentration box 112 is connected to the air guide tube 116 with the upper end sealed and the lower end open. A connecting column 115 is arranged inside the air guide tube 116. A space for gas flow is left between the inner wall of the air guide tube 116 and the outer wall of the connecting column 115. The lower end of the connecting column 115 is fixedly connected to a floating plate 114. The floating plate 114 is arranged in the first-stage concentration box 112. The floating plate 114 can block the lower end opening of the air guide tube 116. The connecting column 115 A sealing column 117 is fixedly connected to the side surface near the upper end, an exhaust pipe 119 is provided on the left end face of the connecting column 115, and the left end face of the connecting column 115 can be arranged in contact with the exhaust pipe 119. The left end of the exhaust pipe 119 passes through the air guide pipe 116 and extends to the outside. A spring 118 is sleeved on the side surfaces of the connecting column 115 and the exhaust pipe 119. The right end of the spring 118 is fixedly connected to the connecting column 115, and the left end of the spring 118 is fixedly connected to the inner wall of the exhaust pipe 119.

[0045] In cooling mode, the condenser 5 is heating, and it releases heat to the outdoor environment, that is, the condenser coil 2 releases heat to the outside world. When the dehumidification solution passes through the evaporator coil 4, the temperature of the dehumidification solution decreases. Finally, when the dehumidification solution is transported to the sleeve 10 by the first water pump 9, the condenser coil 2 releases heat to the outside world. At this time, the temperature of the dehumidification solution is relatively low, and it can quickly absorb the heat from the outer surface of the condenser coil 2, which helps to improve the cooling effect of the air conditioner. The dehumidification solution will be heated by the condenser coil 2, and the moisture inside the dehumidification solution will form steam. The steam and the dehumidification solution will enter the first-stage concentration box 112, and the steam will gather inside the upper end of the first-stage concentration box 112. Finally, the internal air pressure at the upper end of the first-stage concentration box 112 increases, squeezing the dehumidification solution in the first-stage concentration box 112, and the dehumidification solution level in the first-stage concentration box 112 drops. It should be noted that the density of the floating plate 114 is greater than the density of the dehumidification solution, and it is always floating on When the dehumidification solution flows into the primary concentration box 112, the primary concentration box 112 is filled, so that the top of the floating plate 114 is in contact with the upper inner wall of the primary concentration box 112, and the lower end of the air guide tube 116 is blocked. When the dehumidification solution level in the primary concentration box 112 drops, the floating plate 114 drops with it. At this time, the lower end opening of the air guide tube 116 opens, and steam enters the air guide tube 116. When the floating plate 114 drops It will also drive the connecting column 115 and the sealing column 117 to descend together, so that the spring 118 bends downward. At this time, the right end of the exhaust pipe 119 is opened, and the steam in the air pipe 116 is discharged from the exhaust pipe 119, so that the internal air pressure at the upper end of the first-stage concentration box 112 is reduced. At this time, the liquid level in the first-stage concentration box 112 rises, the floating plate 114 blocks the lower end of the air pipe 116, and the sealing column 117 blocks the right end of the exhaust pipe 119 to prevent the dehumidification solution from leaking.

[0046] like Figures 1 to 5 As shown, the secondary concentration assembly includes a secondary concentration tank 11, a primary concentration box 112 is arranged in the secondary concentration tank 11, a bottom wall of the primary concentration box 112 is penetrated with a plurality of evenly distributed flow holes 113, the upper end of the air guide pipe 116 penetrates the upper top wall of the secondary concentration tank 11 and extends to the outside, the left and right sides of the inner wall of the secondary concentration tank 11 are alternately connected with inclined plates 16, the inclined plates 16 are made of heat-conducting materials, an electric heating wire is installed inside the inclined plates 16, and an air permeable pipe 17 with upper and lower openings is connected to the inclined plates 16, and the air permeable pipes 17 are distributed in multiple groups, the lower end of the secondary concentration tank 11 is connected to the second water pump 12 through a connecting pipe, and the water outlet of the second water pump 12 is connected to the spray plate 14 through a connecting pipe;

[0047] A plurality of evenly distributed air guide holes 21 are formed on the side wall of the air guide pipe 116 near the lower end thereof. The air guide holes 21 are located inside the secondary concentration tank 11 .

[0048] During winter heating, the condenser coil 2 absorbs outdoor heat, and the primary concentration at this time cannot concentrate the dehumidification solution. During winter cooling, the evaporator coil 4 heats, and the temperature of the dehumidification solution rises when passing through the evaporator coil 4. The heated dehumidification solution heats the condenser coil 2 in the casing 10 after flowing into the casing 10, so that the condenser coil 2 heats up quickly, thereby helping to improve the efficiency of air conditioning heating. In addition, by heating the condenser coil 2, the problem of frost on the outer surface of the condenser 5 in winter is also avoided. The dehumidification solution flows into the primary concentration box 112, and finally flows down from the liquid flow hole 113, flows onto the inclined plate 16, and follows the slope of the inclined edge. It flows downward and then flows into the next group of inclined plates 16. An electric heating wire is installed in the inclined plate 16. The inclined plate 16 is made of metal material. The electric heating wire heats the inclined plate 16. The inclined plate 16 will heat the dehumidification solution flowing on the surface. The water in the dehumidification solution evaporates and flows upward. By installing the air permeable pipe 17, it is convenient for the steam to flow upward. Finally, the steam enters the air guide pipe 116 through the air guide hole 21. As the steam continues to gather, the pressure of the air guide pipe 116 increases, and the air pressure pushes the floating plate 114 to move downward. Finally, the right end of the exhaust pipe 119 is opened, and the steam is quickly discharged to the outside through the exhaust pipe 119, so as to realize the concentration of the dehumidification solution in winter.

[0049] like Figure 1 to Figure 2 As shown, the connecting pipe between the second water pump 12 and the spray plate 14 is also connected to a heat exchange coil 13, which is buried deep underground and is made of a heat-conducting metal material.

[0050] In summer, after the low-temperature dehumidification solution exchanges heat with the condenser coil 2, the temperature of the dehumidification solution becomes higher, and the high-temperature dehumidification solution will be pumped into the heat exchange coil 13 by the second water pump 12. The heat exchange coil 13 is buried underground, and the underground has the characteristics of being warm in winter and cool in summer. The dehumidification solution will exchange heat with the earth when passing through the heat exchange coil 13, thereby reducing the temperature of the dehumidification solution. The low-temperature dehumidification solution is sprayed onto the evaporator coil 4, ensuring the cooling effect of the air conditioner.

[0051] like Figure 1 and Figure 3 As shown, a concentration sensor 18 is installed near the lower position of the inner wall of the secondary concentration tank 11. The concentration sensor 18 is used to detect the concentration of the dehumidification solution. A controller is installed in the condenser 5. The controller can control the heat generated by the heating wire. The controller is electrically connected to the concentration sensor 18.

[0052] If the dehumidification solution is a calcium chloride solution, the concentration sensor 18 is a calcium chloride aqueous solution concentration sensor. The concentration sensor 18 detects the concentration of the concentrated dehumidification solution and inputs the detected value into the controller. The controller compares the detected value with the value of the normal dehumidification solution concentration. If the detected concentration is lower than the normal value, the controller controls the temperature of the heating wire to increase. If the detected concentration is higher than the normal value, the controller controls the temperature of the heating wire to decrease, thereby achieving precise control of the concentration of the dehumidification solution.

[0053] like Figure 1 and Figure 3 As shown, a first liquid sensor 15 is installed on the upper half of the inner wall of the collection box 8, and a second liquid sensor 19 is installed near the middle of the inner wall of the secondary concentration tank 11. The controller is electrically connected to the first liquid sensor 15 and the second liquid sensor 19, and the controller can control the water output of the first water pump 9 and the second water pump 12.

[0054] When the first liquid sensor 15 detects the corresponding liquid level, it means that the discharge amount of the dehumidification solution in the collection box 8 is less than the input amount, and there is too much dehumidification solution in the collection box 8. At this time, the controller controls the water output of the first water pump 9 to increase, and quickly reduce the liquid level in the collection box 8. When the first liquid sensor 15 cannot detect the liquid level, the controller controls the first water pump 9 to return to the initial normal drainage value; when the second liquid sensor 19 detects the corresponding liquid level, it means that there is too much liquid in the secondary concentration tank 11. The controller controls the water output of the second water pump 12 to increase, and quickly reduce the liquid in the secondary concentration tank 11. When the second liquid sensor 19 cannot detect the liquid level, the controller controls the second water pump 12 to return to the initial normal drainage value.

[0055] like Figure 5 As shown, a rubber sheet 20 is arranged between the sealing column 117 and the exhaust pipe 119, and the rubber sheet 20 is fixedly connected to the sealing column 117. When the sealing column 117 seals the right end opening of the exhaust pipe 119, the installed rubber sheet 20 can improve the sealing effect on the right end of the exhaust pipe 119.

[0056] The above are only preferred specific implementations of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and improved concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-evaporator stacked low dew point frost-free air conditioning system, comprising a compressor (1), an expansion valve (3), a condenser (5) and an evaporator (6), wherein the condenser (5) and the evaporator (6) are both provided with an air inlet and an air outlet, and fans are installed in the condenser (5) and the evaporator (6), wherein a condenser coil (2) is installed in the condenser (5), and an evaporator coil (4) is installed in the evaporator (6), and the compressor (1), the condenser coil (2), the expansion valve (3) and the evaporator coil (4) are connected in sequence through a conduit to form a refrigeration device; Features: A spray plate (14) is arranged above the evaporator coil (4), and the spray plate (14) is used to spray a dehumidifying solution. A liquid receiving box (7) is arranged below the evaporator coil (4). The spray plate (14) and the liquid receiving box (7) are connected via a connecting pipe, and a concentration component and a heat exchange component are also connected to the connecting pipe. The concentration component is used to remove moisture from the dehumidification solution; The heat exchange component is used to perform heat exchange on the dehumidification solution; The lower end of the liquid receiving box (7) is connected to the collecting box (8) via a connecting pipe and is connected to the water inlet end of the collecting box (8); the water outlet end of the collecting box (8) is connected to the first water pump (9) via a connecting pipe and is connected to the water inlet of the first water pump (9); the water outlet end of the first water pump (9) is connected to the spray plate (14) via a connecting pipe; The concentration component comprises a primary concentration component and a secondary concentration component, and the primary concentration component comprises a sleeve (10); The sleeve (10) is sleeved on the outside of the condenser coil (2); the water outlet of the first water pump (9) is connected to the water inlet end of the sleeve (10) via a connecting pipe; the water outlet end of the sleeve (10) is connected to a first-stage concentration box (112) via the connecting pipe; an exhaust assembly is installed at the upper end of the first-stage concentration box (112); the exhaust assembly is used to discharge water vapor into the air; the interior of the first-stage concentration box (112) is interconnected with the spray plate (14) via the connecting pipe; The exhaust assembly comprises an air guide pipe (116); the upper end of the first-stage concentration box (112) is connected to the air guide pipe (116) whose upper end is sealed and whose lower end is open; a connecting column (115) is arranged inside the air guide pipe (116); a space for gas flow is left between the inner wall of the air guide pipe (116) and the outer wall of the connecting column (115); the lower end of the connecting column (115) is fixedly connected to a floating plate (114); the floating plate (114) is arranged in the first-stage concentration box (112); the floating plate (114) can block the lower end opening of the air guide pipe (116); the connecting column (115) 5) is fixedly connected to a sealing column (117) at a position close to the upper end of the side surface of the connecting column (115), an exhaust pipe (119) is arranged on the left end surface of the connecting column (115), the left end surface of the connecting column (115) can be arranged in contact with the exhaust pipe (119), the left end of the exhaust pipe (119) penetrates the air guide pipe (116) and extends to the outside, the side surfaces of the connecting column (115) and the exhaust pipe (119) are sleeved with a spring (118), the right end of the spring (118) is fixedly connected to the connecting column (115), and the left end of the spring (118) is fixedly connected to the inner wall of the exhaust pipe (119); The secondary concentration assembly comprises a secondary concentration tank (11), the primary concentration box (112) is arranged in the secondary concentration tank (11), the bottom wall of the primary concentration box (112) is penetrated by a plurality of groups of evenly distributed liquid flow holes (113), the upper end of the air guide pipe (116) penetrates the upper top wall of the secondary concentration tank (11) and extends to the outside, the left and right sides of the inner wall of the secondary concentration tank (11) are alternately connected with inclined plates (16), the inclined plates (16) are made of heat-conducting material, the inside of the inclined plates (16) is installed with electric heating wires, the inclined plates (16) are connected with air vents (17) with upper and lower openings, the air vents (17) are distributed in a plurality of groups, the lower end of the secondary concentration tank (11) is connected to a second water pump (12) through a connecting pipe, and the water outlet of the second water pump (12) is connected to a spray plate (14) through a connecting pipe.

2. A multi-evaporator stacked low dew point no-frost air conditioning system according to claim 1, characterized in that: A plurality of groups of evenly distributed air guide holes (21) are provided on the side wall of the air guide pipe (116) near the lower end, and the air guide holes (21) are located inside the secondary concentration tank (11).

3. A multi-evaporator stacked low dew point no-frost air conditioning system according to claim 2, characterized in that: The connecting pipe between the second water pump (12) and the spray plate (14) is also connected to a heat exchange coil (13); the heat exchange coil (13) is deeply buried underground; the heat exchange coil (13) is made of a heat-conducting metal material.

4. A multi-evaporator stacked low dew point no-frost air conditioning system according to claim 3, characterized in that: A concentration sensor (18) is installed near the lower part of the inner wall of the secondary concentration tank (11), and the concentration sensor (18) is used to detect the concentration of the dehumidification solution. A controller is installed in the condenser (5), and the controller can control the amount of heat generated by the heating wire. The controller is electrically connected to the concentration sensor (18).

5. A multi-evaporator stacked low dew point no-frost air conditioning system according to claim 4, characterized in that: A first liquid level sensor (15) is installed on the upper half of the inner wall of the collection box (8), and a second liquid level sensor (19) is installed near the middle of the inner wall of the secondary concentration tank (11). The controller is electrically connected to the first liquid level sensor (15) and the second liquid level sensor (19), and the controller can control the water output of the first water pump (9) and the second water pump (12).

6. A multi-evaporator stacked low dew point no-frost air conditioning system according to claim 5, characterized in that: A rubber sheet (20) is provided between the sealing column (117) and the exhaust pipe (119), and the rubber sheet (20) and the sealing column (117) are fixedly connected.

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