Double-evaporation and condensation air conditioning unit

Abstract

The utility model discloses a double evaporation and condensation air conditioning unit which comprises an outdoor unit and an indoor unit, and the outdoor unit is connected with the indoor unit through a refrigerant air pipe and a refrigerant liquid pipe. The outdoor unit comprises an outdoor unit shell, and each side wall of the outdoor unit shell is sequentially provided with an air outlet, an upper air inlet and a lower air inlet from top to bottom. An axial flow fan, a two-stage condensation unit, a water collecting tray and a water tank are sequentially arranged in the outdoor unit shell from top to bottom. A group of wet film pre-cooling sections are arranged in the outdoor unit shell close to each side wall; a circulating water pump is arranged in the water tank and supplies water to each group of wet film pre-cooling sections and the two-stage condensation unit through a water supply pipe network; a compressor is further arranged below the water collecting tray, connected with the indoor unit through a refrigerant air pipe and connected with the two-stage condensation unit through a main feeding pipe. The two-stage condensation unit is connected with the indoor unit through a refrigerant liquid pipe. The unit has the characteristics of low energy consumption and high energy efficiency ratio.

Description

Technical Field

[0001] The utility model belongs to the technical field of air-conditioning systems, and in particular relates to a double evaporation condensing air-conditioning unit. Background Art

[0002] Although traditional mechanical refrigeration air-conditioning units are not affected by meteorological conditions during use and have relatively better stability, for places such as factories, workshops, and data centers that require long-term and large-scale use of air conditioning, the compressor needs to be used continuously, resulting in low operating efficiency and huge energy consumption. In current energy-saving air conditioners, most of the condensation side only uses a single evaporative condensation technology, and its single-machine refrigeration capacity and energy efficiency ratio are still low, especially in summer when the outdoor temperature is high and the wet-bulb temperature of the inlet air is high. When the air exchanges heat and moisture with the water film of the evaporative condenser, it cannot take away a large amount of heat in the refrigerant in time, which will lead to poor heat dissipation of the condenser in this type of air-conditioning unit, causing the compressor to start overheating protection, which will seriously reduce the unit's refrigeration capacity and even cause downtime. Utility Model Content

[0003] The utility model aims to provide a double evaporation condensing air-conditioning unit, which has the characteristics of low energy consumption and high energy efficiency ratio.

[0004] The technical solution adopted by the utility model is that the double evaporation condensing air conditioning unit includes an outdoor unit and an indoor unit, and the outdoor unit is connected to the indoor unit through a refrigerant gas pipe and a refrigerant liquid pipe;

[0005] The outdoor unit includes an outdoor unit shell, and each side wall of the outdoor unit shell is provided with an exhaust port, an upper air inlet and a lower air inlet in sequence from top to bottom;

[0006] An axial flow fan, a two-stage condensing unit, a water collecting pan and a water tank are arranged in sequence from top to bottom in the shell of the outdoor unit; a group of wet film pre-cooling sections are arranged near each side wall in the shell of the outdoor unit; a circulating water pump is arranged in the water tank, and the circulating water pump supplies water to each group of wet film pre-cooling sections and the two-stage condensing unit through the water supply network; a compressor is also arranged under the water collecting pan, and the compressor is connected to the indoor unit through the refrigerant gas pipe, and the compressor is connected to the two-stage condensing unit through the feed main pipe; the two-stage condensing unit is connected to the indoor unit through the refrigerant liquid pipe; the water collecting pan is connected to the water tank through the return pipe.

[0007] The utility model is also characterized in that:

[0008] A water baffle is arranged between the axial flow fan and the two-stage condensing unit; an upper pull-out filter is arranged at each upper air inlet; and a lower pull-out filter is arranged at each lower air inlet.

[0009] The two-stage condensing unit includes an air-cooled condenser unit, a middle spray device, and an evaporative condenser arranged in sequence from top to bottom;

[0010] The air-cooled condenser unit includes air-cooled condensers whose number is the same as the number of upper air inlets, each air-cooled condenser corresponds to the upper air inlet one by one and is at the same horizontal height; the inlet of each air-cooled condenser is connected to the feed main pipe through a feed branch pipe, and the outlet of each air-cooled condenser is connected to the discharge main pipe through a discharge branch pipe; the inlet of the evaporative condenser is connected to the discharge main pipe, and the outlet of the evaporative condenser is connected to the indoor unit through a refrigerant liquid pipe;

[0011] The central spray device comprises a central spray water distribution pipe, on which a plurality of spray heads are arranged; the central spray water distribution pipe is connected with a water supply network.

[0012] The water supply network includes several water supply branches and water supply pipes. The several water supply branches are connected to the water supply pipes, and the water supply pipes are also connected to the circulating water pump; the water supply branches correspond to the wet film precooling sections one by one, and supply water to the wet film precooling sections;

[0013] Each group of wet film precooling sections includes an upper spray device and a wet film arranged in sequence from top to bottom; the upper spray device includes an upper spray water distribution pipe, a plurality of nozzles are arranged on the upper spray water distribution pipe, and the upper spray water distribution pipe is connected with the water supply pipe through a water supply branch pipe; the middle spray water distribution pipe is connected with any one of the water supply branches.

[0014] The indoor unit includes an indoor unit shell, in which an indoor evaporator is arranged, the outlet of the indoor evaporator is connected to the inlet of the compressor through a refrigerant gas pipe, and the inlet of the indoor evaporator is connected to the outlet of the evaporative condenser through a refrigerant liquid pipe; a throttling device is also arranged on the refrigerant liquid pipe; two indoor end air outlets are arranged on the side wall of one side of the indoor unit shell, and an indoor side fan is arranged at each indoor end air outlet.

[0015] The throttling device is a throttling valve or an expansion valve.

[0016] The beneficial effects of the utility model are:

[0017] (1) The air conditioning unit of the utility model adopts an integrated unit and can be prefabricated, which not only saves space, but also facilitates installation and shortens construction period;

[0018] (2) The utility model air conditioning unit is provided with a wet film at the air inlet of each side to cool the circulating water, pre-cool the outdoor air, and further filter it to produce cold air and cold water at a lower temperature;

[0019] (3) The evaporative condenser of the air conditioning unit of the utility model adopts a bare copper tube type, and the water film on the surface of the copper tube is more uniform and has no dry spots, which reduces the possibility of corrosion and scaling. In addition, the evaporative condensation technology is adopted to use the latent heat of water vaporization to remove the condensation heat, thereby improving the condensation efficiency of the condenser;

[0020] (4) The air-cooled condenser of the air-conditioning unit of the utility model adopts a finned tube type, and fins are added outside the heat exchange coil to increase the heat exchange area and improve the heat exchange efficiency;

[0021] (5) The utility model air conditioning unit couples air cooling, evaporative cooling and wet film precooling technology to reduce the condensing temperature and condensing pressure of the unit, thereby greatly improving the energy efficiency ratio of the unit and achieving high efficiency and energy saving of the unit;

[0022] (6) The air conditioning unit of the utility model adopts dual air duct and dual condensation technology. The lower temperature cold air produced by the upper air duct pre-cools the high temperature refrigerant in the air-cooled condenser, and the low temperature cold air produced by the lower air duct enters the middle air duct and exchanges heat and moisture with the water film on the surface of the evaporative condenser again, using the latent heat of water vaporization to remove the condensation heat and further cool the refrigerant, thus realizing the cascade utilization of energy and improving the refrigeration efficiency of the unit.

[0023] (7) The air conditioning unit of the utility model makes full use of natural cold sources to cool the refrigerant. Compared with the traditional pure air cooling, the unit is more energy-saving and efficient;

[0024] (8) The utility model air conditioning unit improves the cleanliness of outdoor fresh air through the double filtration system of pull-out filter screen and wet membrane, ensuring the safe and clean operation of the unit;

[0025] (9) In the air conditioning unit of the utility model, since the heat load of the high-temperature refrigerant is first borne by the upper air-cooled condenser, the heat load of the evaporative condensing coil part of the evaporative condenser that relies on the evaporation of the water film is reduced, and the amount of cooling water is also reduced accordingly;

[0026] (10) The utility model air-conditioning unit couples two evaporative condensing technologies. Evaporative condensing is an excellent technology that combines the advantages of air cooling and water cooling. It not only effectively solves the problem of freezing of traditional water-cooled air-conditioning cooling towers in northern winter, but also reduces the risk of low efficiency or even downtime of traditional air-cooled condensing air-conditioning in summer. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the utility model double evaporation condensing air conditioning unit;

[0028] Figure 2 This is an appearance diagram of the outdoor unit housing of the double evaporation condensing air-conditioning unit of the utility model;

[0029] Figure 3It is a structural schematic diagram of the outdoor unit of the double evaporation condensing air-conditioning unit of the utility model;

[0030] Figure 4 It is a structural schematic diagram of an indoor unit of a double evaporation condensing air-conditioning unit of the utility model;

[0031] Figure 5 It is a top view of the wet film on four sides of the outdoor unit and the air-cooled condenser of the double evaporation condensing air-conditioning unit of the utility model;

[0032] Figure 6 It is a three-dimensional diagram of the wet film on four sides of the outdoor unit of the double evaporation condensing air-conditioning unit of the utility model.

[0033] In the figure, 1. upper air inlet, 2. upper pull-out filter, 3. wet film, 4. air-cooled condenser, 5. lower air inlet, 6. lower pull-out filter, 7. exhaust port, 8. axial flow fan, 9. water baffle, 10. upper spray device, 11. refrigerant gas pipe, 12. middle spray device, 13. evaporative condenser, 14. water collection tray, 15. water supply pipe, 16. return pipe, 17. return port, 18. water Box, 19. Circulating water pump, 20. Compressor, 21. Refrigerant liquid pipe, 22. Throttling device, 23. Indoor evaporator, 24. Indoor fan, 25. Outdoor unit shell, 26. Feed main pipe, 27. Feed branch pipe, 28. Discharge branch pipe, 29. Discharge main pipe, 30. Middle spray water distribution pipe, 31. Upper spray water distribution pipe, 32. Water supply branch pipe, 33. Indoor unit shell, 34. Indoor air outlet. DETAILED DESCRIPTION

[0034] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0035] The utility model provides a double evaporation condensing air conditioning unit, such as Figure 1-6 As shown, it includes an outdoor unit and an indoor unit. The outdoor unit is connected to the indoor unit through a refrigerant gas pipe 11 and a refrigerant liquid pipe 21; the outdoor unit has air inlet on four sides and air outlet on the top, and each side has two air inlets; the outdoor unit shell 25 is equipped with air inlets, pull-out filters, wet membranes, and air-cooled condensers on all four sides, which are arranged opposite to each other at the same height, with an air duct in the middle.

[0036] like Figure 2-3 As shown, the outdoor unit includes an outdoor unit housing 25, and the outdoor unit housing 25 includes four side walls. Each side wall of the outdoor unit housing 25 is provided with an exhaust port 7, an upper air inlet 1 and a lower air inlet 5 in sequence from top to bottom;

[0037] An axial flow fan 8, a two-stage condensing unit, a water collecting pan 14 and a water tank 18 are sequentially arranged in the outdoor unit shell 25 from top to bottom; a group of wet film precooling sections are arranged near each side wall in the outdoor unit shell 25, and each group of wet film precooling sections is located above the water collecting pan 14, and one side of each group of wet film precooling sections is an upper air inlet 1 and a lower air inlet 5 arranged up and down, and the other side of each group of wet film precooling sections is a two-stage condensing unit; a circulating water pump 19 is arranged in the water tank 18, and the circulating water pump 19 supplies water to each group of wet film precooling sections and the two-stage condensing unit through a water supply network; a compressor 20 is also arranged below the water collecting pan 14, and the compressor 20 is connected to the indoor unit through a refrigerant gas pipe 11, and the compressor 20 is connected to the two-stage condensing unit through a feed main pipe 26; the two-stage condensing unit is connected to the indoor unit through a refrigerant liquid pipe 21; the water collecting pan 14 is connected to the return port 17 on the side wall of the water tank 18 through a return pipe 16. The compressor 20 and the water tank 18 are both installed at the bottom of the outdoor unit casing 25 .

[0038] A water baffle 9 is provided between the axial flow fan 8 and the two-stage condensing unit; an upper pull-out filter 2 is provided at each upper air inlet 1; and a lower pull-out filter 6 is provided at each lower air inlet 5 .

[0039] The two-stage condensing unit includes an air-cooled condenser unit, a middle spray device 12, and an evaporative condenser 13 arranged in sequence from top to bottom; Figure 5 As shown, the air-cooled condenser unit includes air-cooled condensers 4 of the same number as the upper air inlet 1, each air-cooled condenser 4 corresponds to the upper air inlet 1 one by one and is at the same horizontal height; the inlet of each air-cooled condenser 4 is connected to the feed main pipe 26 through the feed branch pipe 27, and the outlet of each air-cooled condenser 4 is connected to the discharge main pipe 29 through the discharge branch pipe 28; the inlet of the evaporative condenser 13 is connected to the discharge main pipe 29, and the outlet of the evaporative condenser 13 is connected to the indoor unit through the refrigerant liquid pipe 21;

[0040] The middle spray device 12 includes a middle spray water distribution pipe 30, on which a plurality of spray heads are arranged; the middle spray water distribution pipe 30 is connected to a water supply network.

[0041] The water supply network includes a plurality of water supply branches 32 and a water supply pipe 15. The plurality of water supply branches 32 are connected to the water supply pipe 15, and the water supply pipe 15 is also connected to the circulating water pump; the water supply branches 32 correspond to the wet film precooling sections one by one, and supply water to the wet film precooling sections;

[0042] like Figure 6As shown, each group of wet film precooling sections includes an upper spray device 10 and a wet film 3 arranged in sequence from top to bottom; the upper spray device 10 includes an upper spray water distribution pipe 31, on which a plurality of nozzles are arranged, and the upper spray water distribution pipe 31 is connected to the water supply pipe 15 through a water supply branch pipe 32; the middle spray water distribution pipe 30 is connected to any one of the water supply branches 32. The wet film 3 is a PVC filler, which is placed at the air inlet on the four sides of the unit. After being filtered, the fresh air first exchanges heat with the wet film 3; a water collecting pan 14 is arranged at the bottom of the wet film 3, and the water in the water collecting pan 14 flows into the water tank 18 through the return pipe 16;

[0043] like Figure 4 As shown, the indoor unit includes an indoor unit shell 33, in which an indoor evaporator 23 is arranged, the outlet of the indoor evaporator 23 is connected to the inlet of the compressor 20 through the refrigerant gas pipe 11, and the inlet of the indoor evaporator 23 is connected to the outlet of the evaporative condenser 13 through the refrigerant liquid pipe 21; a throttling device 22 is also arranged on the refrigerant liquid pipe 21; two indoor end air outlets 34 are arranged on the side wall of one side of the indoor unit shell 33, and an indoor side fan 24 is arranged at each indoor end air outlet 34, and there are two groups of indoor side fans 24, which are all installed in front of the indoor side evaporator 23.

[0044] The throttling device 22 is a throttling valve or an expansion valve.

[0045] The evaporative condenser 13 is a bare copper tube type, and the air-cooled condenser 4 is a finned tube type.

[0046] The axial flow fan 8 is an EC fan, which is placed on the upper part of the water retaining plate 9;

[0047] The high-temperature and high-pressure refrigerant gas compressed by the compressor is first sent to the four air-cooled condensers 4 arranged on the upper part of the outdoor unit shell 25 and facing the four upper air inlets 1 through the refrigerant pipeline for preliminary heat exchange, and then sent to the evaporative condenser 13 for secondary heat exchange, and finally returns to the indoor unit;

[0048] The cold water in the water tank 18 is sent to the four wet films 3 arranged on the four sides of the unit and the middle spray device 12 above the evaporative condenser 13 through the water supply pipe 15 under the action of the circulating water pump 19, and the water after spraying falls into the water collection tray 14;

[0049] The outdoor unit can be divided into two air ducts. A part of the fresh air enters the outdoor unit shell 25 through the upper air inlet 1 on the four side walls of the unit, first exchanges heat and moisture with the wet film 3 to obtain fresh air with a lower temperature, then exchanges heat with the air-cooled condenser 4, and finally is discharged from the top exhaust port 7; while the other part of the fresh air enters the outdoor unit shell 25 from the lower air inlet 5 set on the four side walls of the unit, also first exchanges heat and moisture with the wet film 3 to obtain low-temperature fresh air, then exchanges heat with the evaporative condenser 13 in the middle air duct, and finally is discharged from the top exhaust port 7.

[0050] The working process of the double evaporation condensing air conditioning unit of the utility model is as follows:

[0051] Air system working process: For the outdoor unit, the unit as a whole can be divided into two air ducts. A part of the fresh air enters the outdoor unit shell 25 through the upper air inlet 1 on the four side walls of the outdoor unit shell 25, and after being roughly filtered by the upper pull-out filter 2, it first exchanges heat and moisture with the wet film 3 to obtain fresh air with a lower temperature, and then exchanges heat with the high-temperature refrigerant in the air-cooled condenser 4 to preliminarily precool the refrigerant. The precooled high-temperature air is finally discharged from the top exhaust port 7; while the other part of the fresh air enters the indoor unit shell 25 from the lower air inlet 5 set on the four side walls of the outdoor unit shell 25. Inside the outer unit housing 25, the water is also roughly filtered by the lower pull-out filter 6 and then heat and moisture are exchanged with the wet film 3. Since the spray water on the surface of the wet film 3 has already exchanged heat and moisture with the outdoor fresh air once at the upper air inlet 1, the air transfers its own sensible heat to the water, and the air temperature is reduced. After the water on the surface of the wet film 3 absorbs the heat from the air, it generates latent heat of vaporization, which makes the water temperature lower than before. Therefore, the temperature of the water on the surface of the lower wet film 3 is lower, and the temperature of the produced cold air is also lower than the cold air temperature in the first air duct. The low-temperature fresh air in the second air duct, which is pre-cooled by the wet film 3, enters the middle air duct of the outdoor unit housing 25 and exchanges heat with the water film on the surface of the evaporative condenser 13. The water film and the air exchange heat and mass under the combined action of the temperature difference and the water vapor pressure difference. The water film absorbs the heat of the refrigerant vapor in the tube, and at the same time, it directly contacts with the fast-flowing air outside the tube to undergo a direct evaporative cooling process. Finally, the air takes away the heat and is discharged from the top exhaust port 7 under the action of the axial flow fan 8.

[0052] For the indoor unit, the indoor return air is cooled by the indoor evaporator 23 under the action of the indoor fan 24 and then sent into the room.

[0053] Water system working process: The water in the water tank 18 of the outdoor unit is divided into two parts through the water supply pipe 15 under the action of the circulating water pump 19. One part is sent to the upper spray device 10 of the wet film precooling set on all four sides of the unit, and the other part is sent to the middle spray device 12 on the side of the middle evaporative condenser, flowing from top to bottom to wet the entire wet film 3 and the condensing coil and form a water film to exchange heat and moisture with the outdoor fresh air and the refrigerant in the pipe. Subsequently, the two parts of water that have not been completely evaporated flow again to the water collection tray 14 under the action of gravity, and finally return to the water tank 18 through the return pipe 16, and the cycle repeats.

[0054] Working process of the refrigerant system: the high-temperature and high-pressure refrigerant gas delivered by the compressor 20 passes through the refrigerant gas pipe 11 and is first pre-cooled with the relatively low-temperature air delivered by the first air duct by the air-cooled condensers 4 arranged on all four sides of the upper part of the unit. The pre-cooled refrigerant enters the evaporative condenser 13 and exchanges heat with the low-temperature air delivered by the second air duct again, and is cooled to become a refrigerant liquid. Then, the refrigerant liquid is throttled and reduced in pressure by the throttling device 22 and returns to the indoor evaporator 23 through the refrigerant liquid pipe 21 to absorb indoor heat and become a refrigerant gas. Finally, the refrigerant gas returns to the outdoor unit under the action of the compressor 20 and becomes a high-temperature and high-pressure refrigerant gas, and the cycle repeats itself.

[0055] The utility model discloses a double evaporation condensing air-conditioning unit, has the characteristics of low energy consumption and high energy efficiency ratio; the outdoor unit of the air-conditioning unit has air intake on four sides and exhaust on the top, and has two air outlets on each side, and through coupling two evaporation condensation technologies, adopts double-duct cold air to cool the refrigerant coil at the same time, realizes the step-by-step utilization of energy, reduces the condensation temperature and condensation pressure at the same time, improves the refrigeration efficiency of the unit, and avoids the problem of abnormal faults such as continuous high pressure in the refrigeration pipeline, thereby achieving the effect of energy saving and electricity saving.

[0056] Example 1

[0057] The utility model provides a double evaporation condensing air conditioning unit, such as Figure 1-6 As shown, it includes an outdoor unit and an indoor unit. The outdoor unit is connected to the indoor unit through a refrigerant gas pipe 11 and a refrigerant liquid pipe 21; the outdoor unit has air inlet on four sides and air outlet on the top, and each side has two air inlets; the outdoor unit shell 25 is equipped with air inlets, pull-out filters, wet membranes, and air-cooled condensers on all four sides, which are arranged opposite to each other at the same height, with an air duct in the middle.

[0058] The outdoor unit includes an outdoor unit housing 25, and the outdoor unit housing 25 includes four side walls. Each side wall of the outdoor unit housing 25 is provided with an exhaust port 7, an upper air inlet 1 and a lower air inlet 5 in sequence from top to bottom.

[0059] An axial flow fan 8, a two-stage condensing unit, a water collecting pan 14 and a water tank 18 are sequentially arranged in the outdoor unit shell 25 from top to bottom; a group of wet film precooling sections are arranged near each side wall in the outdoor unit shell 25, and each group of wet film precooling sections is located above the water collecting pan 14, and one side of each group of wet film precooling sections is an upper air inlet 1 and a lower air inlet 5 arranged up and down, and the other side of each group of wet film precooling sections is a two-stage condensing unit; a circulating water pump 19 is arranged in the water tank 18, and the circulating water pump 19 supplies water to each group of wet film precooling sections and the two-stage condensing unit through a water supply network; a compressor 20 is also arranged below the water collecting pan 14, and the compressor 20 is connected to the indoor unit through a refrigerant gas pipe 11, and the compressor 20 is connected to the two-stage condensing unit through a feed main pipe 26; the two-stage condensing unit is connected to the indoor unit through a refrigerant liquid pipe 21; the water collecting pan 14 is connected to the return port 17 on the side wall of the water tank 18 through a return pipe 16. The compressor 20 and the water tank 18 are both installed at the bottom of the outdoor unit casing 25 .

[0060] Example 2

[0061] The utility model provides a double evaporation condensing air conditioning unit, such as Figure 1-6 As shown, it includes an outdoor unit and an indoor unit. The outdoor unit is connected to the indoor unit through a refrigerant gas pipe 11 and a refrigerant liquid pipe 21; the outdoor unit has air inlet on four sides and air outlet on the top, and each side has two air inlets; the outdoor unit shell 25 is equipped with air inlets, pull-out filters, wet membranes, and air-cooled condensers on all four sides, which are arranged opposite to each other at the same height, with an air duct in the middle.

[0062] The outdoor unit includes an outdoor unit housing 25, and the outdoor unit housing 25 includes four side walls. Each side wall of the outdoor unit housing 25 is provided with an exhaust port 7, an upper air inlet 1 and a lower air inlet 5 in sequence from top to bottom.

[0063] An axial flow fan 8, a two-stage condensing unit, a water collecting pan 14 and a water tank 18 are sequentially arranged in the outdoor unit shell 25 from top to bottom; a group of wet film precooling sections are arranged near each side wall in the outdoor unit shell 25, and each group of wet film precooling sections is located above the water collecting pan 14, and one side of each group of wet film precooling sections is an upper air inlet 1 and a lower air inlet 5 arranged up and down, and the other side of each group of wet film precooling sections is a two-stage condensing unit; a circulating water pump 19 is arranged in the water tank 18, and the circulating water pump 19 supplies water to each group of wet film precooling sections and the two-stage condensing unit through a water supply network; a compressor 20 is also arranged below the water collecting pan 14, and the compressor 20 is connected to the indoor unit through a refrigerant gas pipe 11, and the compressor 20 is connected to the two-stage condensing unit through a feed main pipe 26; the two-stage condensing unit is connected to the indoor unit through a refrigerant liquid pipe 21; the water collecting pan 14 is connected to the return port 17 on the side wall of the water tank 18 through a return pipe 16. The compressor 20 and the water tank 18 are both installed at the bottom of the outdoor unit casing 25 .

[0064] A water baffle 9 is provided between the axial flow fan 8 and the two-stage condensing unit; an upper pull-out filter 2 is provided at each upper air inlet 1; and a lower pull-out filter 6 is provided at each lower air inlet 5 .

[0065] Example 3

[0066] The utility model provides a double evaporation condensing air conditioning unit, such as Figure 1-6 As shown, it includes an outdoor unit and an indoor unit. The outdoor unit is connected to the indoor unit through a refrigerant gas pipe 11 and a refrigerant liquid pipe 21; the outdoor unit has air inlet on four sides and air outlet on the top, and each side has two air inlets; the outdoor unit shell 25 is equipped with air inlets, pull-out filters, wet membranes, and air-cooled condensers on all four sides, which are arranged opposite to each other at the same height, with an air duct in the middle.

[0067] The outdoor unit includes an outdoor unit housing 25, and the outdoor unit housing 25 includes four side walls. Each side wall of the outdoor unit housing 25 is provided with an exhaust port 7, an upper air inlet 1 and a lower air inlet 5 in sequence from top to bottom.

[0068] An axial flow fan 8, a two-stage condensing unit, a water collecting pan 14 and a water tank 18 are sequentially arranged in the outdoor unit shell 25 from top to bottom; a group of wet film precooling sections are arranged near each side wall in the outdoor unit shell 25, and each group of wet film precooling sections is located above the water collecting pan 14, and one side of each group of wet film precooling sections is an upper air inlet 1 and a lower air inlet 5 arranged up and down, and the other side of each group of wet film precooling sections is a two-stage condensing unit; a circulating water pump 19 is arranged in the water tank 18, and the circulating water pump 19 supplies water to each group of wet film precooling sections and the two-stage condensing unit through a water supply network; a compressor 20 is also arranged below the water collecting pan 14, and the compressor 20 is connected to the indoor unit through a refrigerant gas pipe 11, and the compressor 20 is connected to the two-stage condensing unit through a feed main pipe 26; the two-stage condensing unit is connected to the indoor unit through a refrigerant liquid pipe 21; the water collecting pan 14 is connected to the return port 17 on the side wall of the water tank 18 through a return pipe 16. The compressor 20 and the water tank 18 are both installed at the bottom of the outdoor unit casing 25 .

[0069] A water baffle 9 is provided between the axial flow fan 8 and the two-stage condensing unit; an upper pull-out filter 2 is provided at each upper air inlet 1; and a lower pull-out filter 6 is provided at each lower air inlet 5 .

[0070] The two-stage condensing unit includes an air-cooled condenser unit, a middle spray device 12, and an evaporative condenser 13 which are arranged in sequence from top to bottom; the air-cooled condenser unit includes air-cooled condensers 4 which are the same in number as the upper air inlet 1, and each air-cooled condenser 4 corresponds to the upper air inlet 1 one by one and is at the same horizontal height; the inlet of each air-cooled condenser 4 is connected to the feed main pipe 26 through a feed branch pipe 27, and the outlet of each air-cooled condenser 4 is connected to the discharge main pipe 29 through a discharge branch pipe 28; the inlet of the evaporative condenser 13 is connected to the discharge main pipe 29, and the outlet of the evaporative condenser 13 is connected to the indoor unit through a refrigerant liquid pipe 21;

[0071] The middle spray device 12 includes a middle spray water distribution pipe 30, on which a plurality of spray heads are arranged; the middle spray water distribution pipe 30 is connected to a water supply network.

Claims

1. Double evaporation condensing air conditioning unit, characterized in that: It comprises an outdoor unit and an indoor unit, wherein the outdoor unit is connected to the indoor unit via a refrigerant gas pipe (11) and a refrigerant liquid pipe (21); The outdoor unit comprises an outdoor unit casing (25), and each side wall of the outdoor unit casing (25) is provided with an exhaust port (7), an upper air inlet (1) and a lower air inlet (5) in sequence from top to bottom; An axial flow fan (8), a two-stage condensing unit, a water collecting pan (14) and a water tank (18) are arranged in sequence from top to bottom in the outdoor unit shell (25); a group of wet film precooling sections are arranged near each side wall in the outdoor unit shell (25); a circulating water pump (19) is arranged in the water tank (18), and the circulating water pump (19) supplies water to each group of wet film precooling sections and the two-stage condensing unit through a water supply network; a compressor (20) is also arranged below the water collecting pan (14), and the compressor (20) is connected to the indoor unit through a refrigerant gas pipe (11), and the compressor (20) is connected to the two-stage condensing unit through a feed main pipe (26); the two-stage condensing unit is connected to the indoor unit through a refrigerant liquid pipe (21); the water collecting pan (14) is connected to the water tank (18) through a return pipe (16).

2. The double evaporation condensing air conditioning unit according to claim 1, characterized in that: A water baffle (9) is provided between the axial flow fan (8) and the two-stage condensing unit; an upper pull-out filter (2) is provided at each upper air inlet (1); and a lower pull-out filter (6) is provided at each lower air inlet (5).

3. The double evaporation condensing air conditioning unit according to claim 2, characterized in that: The two-stage condensing unit comprises an air-cooled condenser unit, a middle spray device (12), and an evaporative condenser (13) which are arranged in sequence from top to bottom; The air-cooled condenser unit comprises air-cooled condensers (4) of the same number as the upper air inlet (1), each air-cooled condenser (4) corresponds to the upper air inlet (1) one by one and is located at the same horizontal height; the inlet of each air-cooled condenser (4) is connected to the feed main pipe (26) through a feed branch pipe (27), and the outlet of each air-cooled condenser (4) is connected to the discharge main pipe (29) through a discharge branch pipe (28); the inlet of the evaporative condenser (13) is connected to the discharge main pipe (29), and the outlet of the evaporative condenser (13) is connected to the indoor unit through a refrigerant liquid pipe (21); The middle spray device (12) comprises a middle spray water distribution pipe (30), on which a plurality of spray heads are arranged; the middle spray water distribution pipe (30) is connected to a water supply network.

4. The double evaporation condensing air conditioning unit according to claim 3, characterized in that: The water supply network includes a plurality of water supply branches (32) and a water supply pipe (15), wherein the plurality of water supply branches (32) are connected to the water supply pipe (15), and the water supply pipe (15) is also connected to a circulating water pump; the water supply branches (32) correspond to the wet film precooling sections one by one, and supply water to the wet film precooling sections; Each group of wet film precooling sections comprises an upper spray device (10) and a wet film (3) arranged in sequence from top to bottom; the upper spray device (10) comprises an upper spray water distribution pipe (31), a plurality of spray heads are arranged on the upper spray water distribution pipe (31), and the upper spray water distribution pipe (31) is connected to the water supply pipe (15) through a water supply branch pipe (32); the middle spray water distribution pipe (30) is connected to any one of the water supply branches (32).

5. The double evaporation condensing air conditioning unit according to claim 4, characterized in that: The indoor unit comprises an indoor unit shell (33), an indoor evaporator (23) is arranged in the indoor unit shell (33), the outlet of the indoor evaporator (23) is connected to the inlet of the compressor (20) through the refrigerant gas pipe (11), and the inlet of the indoor evaporator (23) is connected to the outlet of the evaporative condenser (13) through the refrigerant liquid pipe (21); a throttling device (22) is also arranged on the refrigerant liquid pipe (21); two indoor end air outlets (34) are arranged on a side wall of one side of the indoor unit shell (33), and an indoor side fan (24) is arranged at each indoor end air outlet (34).

6. The double evaporation condensing air conditioning unit according to claim 5, characterized in that: The throttling device (22) is a throttling valve or an expansion valve.

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