Condensate water recycling and self-utilizing system of direct expansion type all fresh air air conditioning cabinet

Abstract

The utility model provides a condensate water recycling and self-utilizing system of a direct expansion type all fresh air air conditioning cabinet, which outputs condensate water of a wet film humidifying section, a pre-cooling section, a fluorine coil pipe section and the pre-cooling section to a condensate water recycling device and circularly supplies the condensate water to the wet film humidifying section for humidifying and cooling and the pre-cooling section for cold water supplement. A single source of condensate water in the prior art is replaced, the water storage tank is used for stabilizing pressure and flow, external water source consumption and wastewater discharge are reduced, and system operation energy consumption and carbon emission are remarkably reduced. An S-shaped backflow-preventing elbow, a check valve and a double-stop-valve structure are arranged, so that backflow of condensate water is effectively prevented; the water replenishing pipe and the electric blow-down valve realize automatic drainage and periodic blow-down of the water storage tank when the water level exceeds the limit, and overflow or deposition pollution of the water tank is avoided; and the bypass structure is convenient for troubleshooting and emergency treatment, so that the shutdown risk is reduced, and the safety protection is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to water treatment technical field more specifically, relate to a kind of direct expansion type full fresh air air conditioning box condensate water recycling self utilization system. BACKGROUND

[0002] Direct expansion type full fresh air air conditioning system is widely used in industrial field, and the condensate produced in its refrigeration process is usually regarded as waste product and directly discharged or used for low-grade purposes (such as greening irrigation). In the traditional technology, the cold energy contained in the condensate is not effectively recovered, causing energy waste.

[0003] The closest prior art to the present application in the prior art is a condensate recovery device with publication number CN205619518U, a kind of direct expansion type full fresh air air conditioning system condensate heat recovery device, which discloses including: cooling coil; condensate water collecting tray for collecting the condensate discharged by the cooling coil; lifting pump for lifting the condensate in the condensate water collecting tray to the condenser air inlet; spray dryer for spraying the condensate at the condenser air inlet to form water mist and exchange heat with the air entering the condenser air inlet.

[0004] In the prior art, the condensate recovery device is used for recovery, and there is water fluctuation and single condensate source, only relying on the condensate of the cooling coil for recovery and utilization, and the condensate supply is unstable.

[0005] Therefore, the utility model provides a kind of condensate supply stable, efficient, a kind of direct expansion type full fresh air air conditioning box condensate water recycling self utilization system. UTILITY MODEL CONTENT

[0006] The utility model provides a kind of condensate supply stable, efficient, a kind of direct expansion type full fresh air air conditioning box condensate water recycling self utilization system.

[0007] The utility model provides a kind of direct expansion full fresh air air conditioning box condensate water recovery self utilization system, including fresh air unit 1, outdoor fluorine supply machine 2, condensate water recovery device 3, it is characterized by: fresh air unit 1 is sequentially provided with fresh air section 11, primary and medium efficiency filter section 12, wet membrane humidification section 13, maintenance section 14, precooling section 15, fluorine coil section 16, fan section 17, air outlet section 18 from left to right, fresh air section 11 is used to receive fresh air, primary and medium efficiency filter section 12 is used to carry out primary and medium efficiency filter to fresh air, wet membrane humidification section 13 is used to summer precooling gas and winter humidification gas, maintenance section 14 is used to facilitate maintenance personnel to open cabinet and carry out maintenance to fresh air unit 1, precooling section 15 is used to precool to fresh air, fluorine coil section 16 is used to cool to fresh air, fan section 17 is used to output to handle fresh air, air outlet section 18 is used to output fresh air, fluorine coil section 16 is connected with outdoor fluorine supply machine 2 by refrigerant pipe 6, the condensing water outlet of wet membrane humidification section 13, the condensing water outlet of precooling section 15, the condensing water outlet of fluorine coil section 16, the water outlet of precooling section 15 are connected with the input end of condensate water recovery device 3, the output end of condensate water recovery device 3 is connected with the water inlet of precooling section 15, wet membrane humidification section 13 respectively, condensate water recovery device 3 is used to carry out recovery to the condensate water generated by fresh air unit 1 and supply wet membrane humidification section 13 humidification cooling and precooling section 15 coil cold water replenishment, the condensate water recovery device 3 includes first water outlet pipe 31, second water outlet pipe 32, first backwater pipe 33, second backwater pipe 34, third backwater pipe 35, water storage tank 36, the condensing water outlet of wet membrane humidification section 13, the condensing water outlet of precooling section 15, the condensing water outlet of fluorine coil section 16 are connected with the input end of water storage tank 36 by second water outlet pipe 32, the water outlet of precooling section 15 is connected with second water outlet pipe 32 by first water outlet pipe 31, the output end of water storage tank 36 is connected with wet membrane humidification section 13 by first backwater pipe 33, second backwater pipe 34, the output end of water storage tank 36 is connected with the water inlet of precooling section 15 by first backwater pipe 33, second backwater pipe 34, water storage tank 36 is used to stabilize pressure and flow.

[0008] In some embodiments, the second water outlet pipe 32 is sequentially provided with a first stop valve 321, a first thermometer 322, a first pressure gauge 323, a first electric regulating valve 324, a first Y-type filter 325, a first condensate water recovery pump 326, a first check valve 327, a second pressure gauge 328, a second thermometer 329, and a second stop valve 37 from left to right to left, the first stop valve 321 and the second stop valve 37 are used to control the opening and closing of the second water outlet pipe 32, the first thermometer 322 and the second thermometer 329 are used to monitor the condensate water outlet temperature in the pipeline, the first pressure gauge 323 and the second pressure gauge 328 are used to monitor the pressure in the pipeline, the first electric regulating valve 324 is used to control the condensate water flow, the first Y-type filter 325 is used to filter the condensate water in the pipeline, the first condensate water recovery pump 326 is used to control the condensate water into the water storage tank 36, and the first check valve 327 is used to prevent the condensate water from flowing back; The eleventh stop valve 311 is arranged on the first water outlet pipe 31, and the eleventh stop valve 311 is used to control the opening and closing of the first water outlet pipe 31.

[0009] In some embodiments, the first water return pipe 33 is sequentially provided with a third stop valve 331, a third thermometer 332, a third pressure gauge 333, a second electric regulating valve 334, a second Y-type filter 335, a second condensate water recovery pump 336, a second check valve 337, a fourth thermometer 338, a fourth pressure gauge 339, and a fourth stop valve 38 from right to left, the third stop valve 331 and the fourth stop valve 38 are used to control the opening and closing of the first water return pipe 33, the third thermometer 332 and the fourth thermometer 338 are used to monitor the condensate water return temperature in the pipeline, the third pressure gauge 333 and the fourth pressure gauge 339 are used to monitor the pressure in the pipeline, the second electric regulating valve 334 is used to control the condensate water flow, the second Y-type filter 335 is used to filter the condensate water in the pipeline, the second condensate water recovery pump 336 is used to control the condensate water into the second water return pipe 34 and the third water return pipe 35, and the second check valve 337 is used to prevent the condensate water from flowing back.

[0010] Further, the second water return pipe 34 is further provided with a third Y-type filter 341, a fifth stop valve 342, a third electric regulating valve 343, and a sixth stop valve 344 from right to left, the third Y-type filter 341 is used to re-filter the return water to ensure the cleanliness of the return water, the fifth stop valve 342 and the sixth stop valve 344 are provided with a first bypass structure 3441 outside, which is convenient for maintenance.

[0011] Further, the third water return pipe 35 is further provided with a fourth Y-type filter 351, a seventh stop valve 352, a fourth electric regulating valve 353, and an eighth stop valve 354 from right to left, the fourth Y-type filter 351 is used to re-filter the return water to ensure the cleanliness of the return water, the seventh stop valve 352 and the eighth stop valve 354 are provided with a second bypass structure 3541 outside, which is convenient for maintenance.

[0012] In some embodiments, the condensate outlet of the wet membrane humidification section 13, the condensate outlet of the pre-cooling section 15, and the condensate outlet of the fluorine coil section 16 are all connected to the second water outlet pipe 32, and an S-shaped anti-backflow bend 5 is arranged at the connection position of each condensate outlet and the second water outlet pipe 32, to prevent the condensate from flowing back.

[0013] In some embodiments, a condensate drainage outlet 4 is further arranged at the side of the connection position of the condensate outlet of the fluorine coil section 16 and the second water outlet pipe 32, to prevent the condensate from being drained in time when the condensate recovery device 3 fails or the water storage is excessive. The condensate drainage outlet 4 is provided with a ninth stop valve 41, and the second water outlet pipe 32 is provided with a tenth stop valve 42 near the condensate drainage outlet 4. The ninth stop valve 41 and the tenth stop valve 42 are used to switch the condensate drainage outlet 4 between condensate discharge and condensate utilization.

[0014] In some embodiments, a liquid level sensor is arranged inside the water storage tank 36, and a water supply pipe is connected to an external water supply system at the top of the water storage tank 36. A float valve 361 is arranged on the water supply pipe, which automatically opens the water supply or drainage when the water level reaches a set height. The liquid level sensor, the float valve 361, an electric regulating valve, and a variable frequency water pump work together to control the condensate supply flow according to the demand, and cooperate with the pressure and flow stabilizing effect of the water storage tank to ensure the stable output of pressure, temperature, and water quantity under different working conditions, and improve the self-adaptive ability of the system.

[0015] In some embodiments, a sewage outlet is arranged at the bottom of the water storage tank 36, which is connected to an external drainage system through a pipeline. A manual ball valve and an electric sewage valve are installed in series on the pipeline. The electric sewage valve is used to realize regular automatic sewage discharge. When the water level in the water storage tank exceeds the limit, the water is automatically drained, and regular sewage discharge is realized to avoid overflow or sedimentation pollution of the water tank.

[0016] In some embodiments, a water quality detector is arranged at the connection position of the wet membrane humidification section 13 and the second water return pipe 34. The signal of the detector is connected to the control system. When the electrical conductivity exceeds a set threshold value, the humidification water circuit is automatically cut off to avoid the influence of impurities or pollutants on the humidification efficiency of the wet membrane and the service life of the equipment, and to ensure the cleanliness and reliability of the circulating water quality.

[0017] The utility model discloses a direct expansion type full fresh air air conditioner box condensate water recycling self utilization system, through humidifying section 13 of wet membrane, precooling section 15, fluorine coil section 16, precooling section 15 condensate water output to condensate water recovery device 3 and circulate humidifying section 13 of wet membrane and precooling section 15 cold water supplement, adopt multiple condensate water sources, replace the single source of condensate water in the prior art, and through water storage tank 36 for play the role of pressure stabilization and current stabilization, reduce external water source consumption and waste water discharge, significantly reduce system operation energy consumption and carbon emission, set up S type anti -backflow bend 5, check valve and double check valve structure, effectively prevent condensate water backflow, water replenishing pipe and electric blowdown valve realize water storage tank water level overrun automatic drainage and regular blowdown, avoid water tank overflow or sediment pollution, bypass structure is convenient for troubleshooting and emergency treatment, reduce downtime risk, improve safety protection. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a direct expansion type full fresh air air conditioner box condensate water recycling self utilization system's structural schematic diagram of the utility model.

[0019] Figure 2 It is a fresh air unit and condensate water recovery device connection structure schematic diagram of the utility model's direct expansion type full fresh air air conditioner box condensate water recycling self utilization system.

[0020] Main element symbol explanation

[0021] Fresh air unit 1, fresh air section 11, primary and medium efficiency filter section 12, humidifying section 13 of wet membrane, overhaul section 14, precooling section 15, fluorine coil section 16, fan section 17, air outlet section 18, outdoor fluorine supply machine 2, condensate water recovery device 3, first water outlet pipe 31, eleventh stop valve 311, second water outlet pipe 32, first stop valve 321, first thermometer 322, first pressure gauge 323, first electric regulating valve 324, first Y type filter 325, first condensate water recovery pump 326, first check valve 327, second pressure gauge 328, second thermometer 329, first water return pipe 33, third stop valve 331, third thermometer 332, third pressure gauge 333, second electric regulating valve 334, second Y type filter 335, second condensate water recovery pump 336, second check valve 337, fourth thermometer 338, fourth pressure gauge 339, second water return pipe 34, third Y type filter 341, fifth stop valve 342, third electric regulating valve 343, sixth stop valve 344, first bypass structure 3441, third water return pipe 35, fourth Y type filter 351, seventh stop valve 352, fourth electric regulating valve 353, eighth stop valve 354, second bypass structure 3541, water storage tank 36, float ball valve 361, second stop valve 37, fourth stop valve 38, condensate water outlet 4, ninth stop valve 41, tenth stop valve 42, S type anti -backflow bend 5, refrigerant pipe 6.

[0022] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0023] The following embodiments are described to aid in understanding this application. These embodiments are not, and should not be, construed in any way as limiting the scope of protection of this application.

[0024] In the following description, those skilled in the art will recognize that throughout this discussion, components may be described as individual functional units (which may include subunits), but those skilled in the art will recognize that various components or portions thereof may be divided into individual components or may be integrated together (including integrated within a single system or component).

[0025] Furthermore, the connection between components or systems is not intended to be limited to a direct connection; on the contrary, data between these components may be modified, reformatted, or otherwise altered by intermediate components. Additionally, other or fewer connections may be used. It should also be noted that the terms "connection," "link," or "input" should be understood to include direct connections, indirect connections via one or more intermediate devices, and wireless connections. Example 1:

[0026] like Figure 1 The diagram shown is a structural schematic of a direct expansion type fresh air conditioning unit condensate recovery and self-utilization system according to this application; Figure 2 The diagram shown is a schematic diagram of the connection structure between the fresh air handling unit and the condensate recovery device in a direct expansion type fresh air conditioning unit condensate recovery and self-utilization system according to this application.

[0027] The utility model provides a kind of direct expansion full fresh air air conditioning box condensate water recovery self utilization system, including fresh air unit 1, outdoor fluorine supply machine 2, condensate water recovery device 3, it is characterized by: fresh air unit 1 is equipped with fresh air section 11, primary and medium efficiency filter section 12, wet membrane humidification section 13, maintenance section 14, precooling section 15, fluorine coil section 16, fan section 17, air outlet section 18 in order from left to right, fresh air section 11 is used to receive fresh air, primary and medium efficiency filter section 12 is used to carry out primary and medium efficiency filter to fresh air, wet membrane humidification section 13 is used to summer precooling gas and winter humidification gas, maintenance section 14 is used to facilitate maintenance personnel to open cabinet and carry out maintenance to fresh air unit 1, precooling section 15 is used to precool to fresh air, fluorine coil section 16 is used to cool to fresh air, fan section 17 is used to output to handle fresh air, air outlet section 18 is used to output fresh air, fluorine coil section 16 is connected with outdoor fluorine supply machine 2 by refrigerant pipe 6, the condensing water outlet of wet membrane humidification section 13, the condensing water outlet of precooling section 15, the condensing water outlet of fluorine coil section 16, the water outlet of precooling section 15 are connected with the input end of condensate water recovery device 3, the output end of condensate water recovery device 3 is connected with the water inlet of precooling section 15, wet membrane humidification section 13 respectively, condensate water recovery device 3 is used to carry out recovery to the condensate water generated by fresh air unit 1 and supply wet membrane humidification section 13 humidification cooling and precooling section 15 coil cold water replenishment, the condensate water recovery device 3 includes first water outlet pipe 31, second water outlet pipe 32, first backwater pipe 33, second backwater pipe 34, third backwater pipe 35, water storage tank 36, the condensing water outlet of wet membrane humidification section 13, the condensing water outlet of precooling section 15, the condensing water outlet of fluorine coil section 16 are connected with the input end of water storage tank 36 by second water outlet pipe 32, the water outlet of precooling section 15 is connected with second water outlet pipe 32 by first water outlet pipe 31, the output end of water storage tank 36 is connected with wet membrane humidification section 13 by first backwater pipe 33, second backwater pipe 34, the output end of water storage tank 36 is connected with the water inlet of precooling section 15 by first backwater pipe 33, second backwater pipe 34, water storage tank 36 is used to stabilize pressure and flow.

[0028] The second water outlet pipe 32 is sequentially provided with a first stop valve 321, a first thermometer 322, a first pressure gauge 323, a first electric regulating valve 324, a first Y-shaped filter 325, a first condensate water recovery pump 326, a first check valve 327, a second pressure gauge 328, a second thermometer 329 and a second stop valve 37 from left to right to left. The first stop valve 321 and the second stop valve 37 are both used for controlling the opening and closing of the second water outlet pipe 32. The first thermometer 322 and the second thermometer 329 are both used for monitoring the condensate water outlet temperature in the pipeline. The first pressure gauge 323 and the second pressure gauge 328 are both used for monitoring the pressure in the pipeline. The first electric regulating valve 324 is used for controlling the condensate water flow. The first Y-shaped filter 325 is used for filtering the condensate water in the pipeline. The first condensate water recovery pump 326 is used for controlling the condensate water into the water storage tank 36. The first check valve 327 is used for preventing the condensate water from flowing back. The first water outlet pipe 31 is provided with an eleventh stop valve 311, which is used for controlling the opening and closing of the first water outlet pipe 31.

[0029] The first water return pipe 33 is sequentially provided with a third stop valve 331, a third thermometer 332, a third pressure gauge 333, a second electric regulating valve 334, a second Y-shaped filter 335, a second condensate water recovery pump 336, a second check valve 337, a fourth thermometer 338, a fourth pressure gauge 339 and a fourth stop valve 38 from right to left. The third stop valve 331 and the fourth stop valve 38 are both used for controlling the opening and closing of the first water return pipe 33. The third thermometer 332 and the fourth thermometer 338 are both used for monitoring the condensate water return temperature in the pipeline. The third pressure gauge 333 and the fourth pressure gauge 339 are both used for monitoring the pressure in the pipeline. The second electric regulating valve 334 is used for controlling the condensate water flow. The second Y-shaped filter 335 is used for filtering the condensate water return in the pipeline. The second condensate water recovery pump 336 is used for controlling the condensate water into the second water return pipe 34 and the third water return pipe 35. The second check valve 337 is used for preventing the condensate water from flowing back.

[0030] The second water return pipe 34 is further provided with a third Y-shaped filter 341, a fifth stop valve 342, a third electric regulating valve 343 and a sixth stop valve 344 from right to left. The third Y-shaped filter 341 is used for re-filtering the water return to ensure the cleanliness of the water return. The fifth stop valve 342 and the sixth stop valve 344 are provided with a first bypass structure 3441 outside, which is convenient for maintenance.

[0031] The third water return pipe 35 is further provided with a fourth Y-shaped filter 351, a seventh stop valve 352, a fourth electric regulating valve 353 and an eighth stop valve 354 from right to left. The fourth Y-shaped filter 351 is used for re-filtering the water return to ensure the cleanliness of the water return. The seventh stop valve 352 and the eighth stop valve 354 are provided with a second bypass structure 3541 outside, which is convenient for maintenance.

[0032] The condensate water outlet of the wet membrane humidifying section 13, the condensate water outlet of the precooling section 15 and the condensate water outlet of the fluorine coil section 16 are all connected with the second water outlet pipe 32, and S-shaped anti-backflow bends 5 are arranged at the connection positions, which are used for preventing the backflow of the condensate water.

[0033] The side of the connection position of the condensate water outlet of the fluorine coil section 16 and the second water outlet pipe 32 is further provided with a condensate water drain 4, which is used for preventing the condensate water from being drained in time when the condensate water recycling device 3 fails or the water storage is excessive. The ninth stop valve 41 is arranged at the condensate water drain 4, and the tenth stop valve 42 is arranged at the position close to the condensate water drain 4 on the second water outlet pipe 32. The ninth stop valve 41 and the tenth stop valve 42 are used for controlling the switch of the condensate water drain 4 for discharging or utilizing the condensate water.

[0034] In some embodiments, the water storage tank 36 is internally provided with a liquid level sensor, and a water supplement pipe is connected to an external water supply system at the top of the water storage tank 36. A float valve 361 is arranged on the water supplement pipe, which is used for automatically opening the water discharge or supplement when the water level reaches a set height. The liquid level sensor, the float valve 361, the electric regulating valve and the variable frequency water pump work cooperatively to control the condensate water supply flow according to the requirement, and the water storage tank is used for stabilizing the pressure and flow, so that the stable output of the pressure, temperature and water quantity under different working conditions is ensured, and the self-adaptive capacity of the system is improved.

[0035] The bottom of the water storage tank 36 is provided with a sewage outlet, which is connected to an external drainage system through a pipeline. A manual ball valve and an electric sewage valve are arranged in series on the pipeline. The automatic periodic sewage discharge is realized through the electric sewage valve, so that the overflow or sediment pollution of the water tank is avoided.

[0036] The water quality detector is arranged at the connection position of the wet membrane humidifying section 13 and the second water return pipe 34. The signal of the water quality detector is connected to the control system. When the electric conductivity exceeds the set threshold value, the humidifying water circuit is automatically cut off, so that the influence of impurities or pollutants on the humidifying efficiency of the wet membrane and the service life of the equipment is avoided, and the clean and reliable circulating water quality is ensured.

[0037] The utility model discloses a kind of direct expansion type full fresh air air conditioning cabinet condensate water recycling self utilization systems, by wet membrane humidifying section 13, precooling section 15, fluorine coil section 16, precooling section 15 condensate water output is to condensate water recycling device 3 and is recycled to supply wet membrane humidifying section 13 humidification cooling and precooling section 15 cold water supplement, using multiple condensate water source, replace the single source of condensate water in prior art, and by water storage tank 36 for stabilizing pressure and flow effect, reduce external water source consumption and waste water discharge, significantly reduce system operation energy consumption and carbon emission;S-shaped anti-backflow bend 5, check valve and double stop valve structure are arranged, effectively prevent condensate water backflow;Water supplement pipe and electric sewage valve realize water storage tank water level over-limit automatic drainage and periodic sewage discharge, avoid water tank overflow or sediment pollution;Bypass structure facilitates troubleshooting and emergency treatment, reduce downtime risk, improve safety protection.

[0038] Although several aspects and embodiments have been disclosed in this application, other aspects and embodiments will be apparent to those skilled in the art from the disclosure herein. The aspects and embodiments disclosed in this application are intended to be merely illustrative of possible aspects and embodiments, and numerous modifications and improvements of the aspects and embodiments disclosed herein will be apparent to those skilled in the art. None of the aspects and embodiments disclosed in this application are intended to be essential to the application except as set forth in the claims below. The scope of the application is defined by the claims and equivalents thereof.

Claims

1. A direct expansion all-fresh air air conditioning unit condensate recovery self-use system, comprising a fresh air unit (1), an outdoor fluorine supply machine (2), and a condensate recovery device (3), characterized in that: The fresh air unit (1) is sequentially provided with a fresh air section (11), an initial-medium-efficiency filtering section (12), a wet membrane humidifying section (13), a maintenance section (14), a pre-cooling section (15), a fluorine coil section (16), a fan section (17), and an air outlet section (18) from left to right. The fresh air section (11) is used for receiving fresh air. The initial-medium-efficiency filtering section (12) is used for filtering the fresh air at an initial-medium-efficiency level. The wet membrane humidifying section (13) is used for pre-cooling air in summer and humidifying air in winter. The maintenance section (14) is used for facilitating maintenance personnel to open a cabinet to maintain the fresh air unit (1). The pre-cooling section (15) is used for pre-cooling the fresh air. The fluorine coil section (16) is used for cooling the fresh air. The fan section (17) is used for outputting the processed fresh air. The air outlet section (18) is used for outputting the fresh air. The fluorine coil section (16) is connected with an outdoor fluorine supply machine (2) through a refrigerant pipe 6. The condensate outlets of the wet membrane humidifying section (13), the pre-cooling section (15), and the fluorine coil section (16) are connected with an input end of a condensate water recovery device (3). An output end of the condensate water recovery device (3) is respectively connected with a water inlet of the pre-cooling section (15) and the wet membrane humidifying section (13). The condensate water recovery device (3) is used for recovering condensate water generated by the fresh air unit (1) and supplying the condensate water to the wet membrane humidifying section (13) for humidifying and cooling and to the pre-cooling section (15) for coil cooling water supplement. The condensate water recovery device (3) comprises a first water outlet pipe (31), a second water outlet pipe (32), a first water return pipe (33), a second water return pipe (34), a third water return pipe (35), and a water storage tank (36). The condensate outlets of the wet membrane humidifying section (13), the pre-cooling section (15), and the fluorine coil section (16) are connected with an input end of the water storage tank (36) through the second water outlet pipe (32). The water outlet of the pre-cooling section (15) is connected with the second water outlet pipe (32) through the first water outlet pipe (31). An output end of the water storage tank (36) is connected with the wet membrane humidifying section (13) through the first water return pipe (33) and the second water return pipe (34). The output end of the water storage tank (36) is connected with the water inlet of the pre-cooling section (15) through the first water return pipe (33) and the second water return pipe (34). The water storage tank (36) is used for stabilizing pressure and flow.

2. The direct expansion, all fresh air, packaged air conditioning unit condensate recovery self-utilization system of claim 1, wherein: The second water outlet pipe (32) is sequentially provided with a first stop valve (321), a first thermometer (322), a first pressure gauge (323), a first electric regulating valve (324), a first Y-shaped filter (325), a first condensate water recovery pump (326), a first check valve (327), a second pressure gauge (328), a second thermometer (329), a second stop valve (37) from left to right to left, the first stop valve (321) and the second stop valve (37) are used for controlling the opening and closing of the second water outlet pipe (32), the first thermometer (322) and the second thermometer (329) are used for monitoring the condensate water outlet temperature in the pipeline, the first pressure gauge (323) and the second pressure gauge (328) are used for monitoring the pressure in the pipeline, the first electric regulating valve (324) is used for controlling the condensate water flow, the first Y-shaped filter (325) is used for filtering the condensate water in the pipeline, the first condensate water recovery pump (326) is used for controlling the condensate water into the water storage tank (36), and the first check valve (327) is used for preventing the condensate water from flowing back; the first water outlet pipe (31) is provided with an eleventh stop valve (311), and the eleventh stop valve (311) is used for controlling the opening and closing of the first water outlet pipe (31).

3. The direct expansion, all fresh air, packaged air conditioning unit condensate recovery self-utilization system of claim 1, wherein: The first water return pipe (33) is sequentially provided with a third stop valve (331), a third thermometer (332), a third pressure gauge (333), a second electric regulating valve (334), a second Y-shaped filter (335), a second condensate water recovery pump (336), a second check valve (337), a fourth thermometer (338), a fourth pressure gauge (339), a fourth stop valve (38) from right to left, the third stop valve (331) and the fourth stop valve (38) are used for controlling the opening and closing of the first water return pipe (33), the third thermometer (332) and the fourth thermometer (338) are used for monitoring the condensate water return temperature in the pipeline, the third pressure gauge (333) and the fourth pressure gauge (339) are used for monitoring the pressure in the pipeline, the second electric regulating valve (334) is used for controlling the condensate water flow, the second Y-shaped filter (335) is used for filtering the condensate water return in the pipeline, the second condensate water recovery pump (336) is used for controlling the condensate water into the second water return pipe (34) and the third water return pipe (35), and the second check valve (337) is used for preventing the condensate water from flowing back.

4. The direct expansion, all fresh air, packaged air conditioning unit condensate recovery self-utilization system of claim 1, wherein: The second water return pipe (34) is further provided with a third Y-shaped filter (341), a fifth stop valve (342), a third electric regulating valve (343) and a sixth stop valve (344) from right to left, the third Y-shaped filter (341) is used for re-filtering the return water to ensure the cleanliness of the return water, the fifth stop valve (342) and the sixth stop valve (344) are provided with a first bypass structure (3441) outside, which is convenient for maintenance.

5. The self-utilizing system for condensate water recovery of a direct expansion all fresh air air handling unit as defined in claim 1, wherein: The third backwater pipe (35) is also provided with a fourth Y-shaped filter (351), a seventh stop valve (352), a fourth electric regulating valve (353) and an eighth stop valve (354) from right to left, the fourth Y-shaped filter (351) is used for re-filtering the backwater to ensure the cleanliness of the backwater, the second bypass structure (3541) is arranged outside the seventh stop valve (352) and the eighth stop valve (354), and the second bypass structure (3541) is convenient for maintenance.

6. The direct expansion, all fresh air, packaged air conditioning unit condensate recovery self-utilization system of claim 1, wherein: The condensate outlet of the wet membrane humidifying section (13), the condensate outlet of the pre-cooling section (15) and the condensate outlet of the fluorine coil section (16) are all provided with S-shaped anti-backflow bends (5) at the connection positions of the condensate outlets and the second water outlet pipe (32), so as to prevent the backflow of the condensate.

7. The self-utilizing system for condensate water recovery of a direct expansion all fresh air air handling unit as defined in claim 1, wherein: The side of the connection position of the condensate outlet of the fluorine coil section (16) and the second water outlet pipe (32) is also provided with a condensate drain outlet (4), so as to prevent the timely drainage when the condensate recovery device (3) is faulty or the water storage is excessive, the ninth stop valve (41) is arranged at the condensate drain outlet (4), the tenth stop valve (42) is arranged close to the condensate drain outlet (4) of the second water outlet pipe (32), and the ninth stop valve (41) and the tenth stop valve (42) are used for switching the on-off of the condensate drain outlet (4) for condensate discharge or utilization.

8. The self-utilizing system for condensate water recovery of a direct expansion all fresh air air handling unit as defined in claim 1, wherein: The water storage tank (36) is internally provided with a liquid level sensor, the top of the water storage tank (36) is provided with a water supplement pipe connected to an external water supply system, the water supplement pipe is provided with a float valve (361), the float valve (361) is used for automatically opening the drainage or water supplement when the water level reaches a set height, the liquid level sensor, the float valve (361), the electric regulating valve and the variable frequency water pump are cooperatively used to control the condensate supply flow according to the requirement, and the water storage tank is used for stabilizing the pressure and flow, so that the stable output of the pressure, temperature and water quantity under different working conditions is ensured, and the self-adaptive capacity of the system is improved.

9. The self-utilizing system for condensate water recovery of a direct expansion all fresh air air handling unit cassette as claimed in claim 1, wherein: The bottom of the water storage tank (36) is provided with a sewage outlet, the sewage outlet is connected to an external drainage system through a pipeline, a manual ball valve and an electric sewage valve are installed in series on the pipeline, the electric sewage valve is used for realizing the automatic periodic sewage, the water storage tank is used for automatically draining water and periodically discharging sewage when the water level exceeds the limit, and the overflow or sediment pollution of the water tank is avoided.

10. The direct expansion, all fresh air, packaged air conditioning unit condensate recovery self-utilization system of claim 1, wherein: The water quality detector is arranged at the connection position of the wet membrane humidifying section (13) and the second backwater pipe (34), the signal of the detector is connected to a control system, the humidifying water path is automatically cut off when the electric conductivity exceeds a set threshold value, the impurities or pollutants are prevented from affecting the humidifying efficiency of the wet membrane and the service life of the equipment, and the clean and reliable circulating water quality is ensured.

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