A water-cooled air-suspended variable-frequency centrifugal unit that can solve the defect of uneven falling film

Abstract

The present invention discloses a water-cooled air-floating variable-frequency centrifugal unit capable of solving the defect of uneven falling film, which relates to the field of variable-frequency centrifugal units and includes a frame, a condenser, an evaporator and an air-floating compressor; the condenser and the evaporator are connected through the inner wall of the frame, one side of the evaporator is connected with the air-floating compressor through a pipeline, the air-floating compressor is connected to one side of the frame through bolts, a flash tank is connected to the front parts of the evaporator and the air-floating compressor through a pipeline, a heat exchange mechanism is connected to the inner wall of the evaporator, and a descaling mechanism is connected to the inner wall of the condenser. For this water-cooled air-floating variable-frequency centrifugal unit, the coolant to be treated is added above the evaporator and flows into the heat exchange tubes, forming a falling film on the inner walls of the heat exchange tubes. The air-floating compressor drives the pneumatic motor to operate, driving the spray pipe and the heat exchange tubes to rotate, so that the refrigerant gas is evenly sprayed on the outer sides of the heat exchange tubes to form a falling film, thereby enabling the water-cooled air-floating variable-frequency centrifugal unit to have an even falling film.

Description

Technical Field

[0001] The present invention relates to the technical field of variable-frequency centrifugal units, and specifically to a water-cooled air-suspended variable-frequency centrifugal unit that can solve the defect of uneven falling film. Background Technique

[0002] The water-cooled air-suspended variable-frequency centrifugal unit is an efficient air-conditioning and refrigeration device, commonly used in the refrigeration systems of large buildings, industrial production and other places. It combines water-cooling, air-suspension and variable-frequency technologies, and uses gas to achieve the suspension of the compressor bearings, reducing mechanical friction. There are still certain defects in the existing water-cooled air-suspended variable-frequency centrifugal units during use, such as;

[0003] The evaporator of the existing water-cooled air-suspended variable-frequency centrifugal unit is usually placed horizontally. In the evaporator, the coolant and refrigerant passing through contact unevenly on the heat exchange pipes, resulting in uneven falling film, uneven heat exchange, and thus affecting the refrigeration effect. In addition, after the existing water-cooled air-suspended variable-frequency centrifugal unit is used for a long time, the shell condenser needs to be disassembled to remove scale, which is rather troublesome. Summary of the Invention

[0004] The purpose of the present invention is to provide a water-cooled air-suspended variable-frequency centrifugal unit that can solve the defect of uneven falling film, so as to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A water-cooled air-suspended variable-frequency centrifugal unit that can solve the defect of uneven falling film, including: a frame, a condenser, an evaporator and an air-floating compressor;

[0006] The condenser and the evaporator are connected through the inner wall of the frame. One side of the evaporator is connected to the air-floating compressor through a pipeline. The air-floating compressor is connected to one side of the frame by bolts. A flash tank is connected to the front parts of the evaporator and the air-floating compressor through a pipeline. A heat exchange mechanism is connected to the inner wall of the evaporator. A descaling mechanism is connected to the inner wall of the condenser. A return air pipe is connected above the flash tank, and the other end of the return air pipe is connected to the air-floating compressor. The air outlet end of the air-floating compressor is connected to an intake pipe, and the intake pipe is connected through the inner wall of the evaporator. An air outlet pipe is connected through the inner wall of the evaporator near the front of the intake pipe, and the other end of the air outlet pipe is connected through the front part of the inner wall of the condenser. The back of the frame is connected with a frequency conversion cabinet and a control cabinet by bolts;

[0007] The heat exchange mechanism includes a hollowed-out disk connected to the inner wall of the evaporator by screws. A heat exchange tube is rotatably penetrated through the inner wall of the hollowed-out disk by a sealed bearing. A jet pipe is rotatably penetrated through the inner wall of the hollowed-out disk close to one side of the heat exchange tube by a sealed bearing. An upper gear is connected to the outer side of the jet pipe by screws, and an upper toothed ring is meshed and connected to the outer side of the upper gear.

[0008] Preferably, a connecting frame is welded to the upper surface of the upper toothed ring. An air motor is connected above the connecting frame by a coupling. The bracket of the air motor is connected to the inner wall of the evaporator. The air inlet end of the air motor is connected to an air inlet pipe, and the air outlet end of the air motor is connected to an air outlet pipe.

[0009] Preferably, a rotating shaft is connected to the bottom of the connecting frame. The rotating shaft is rotatably penetrated through the hollowed-out disk by a sealed bearing.

[0010] Preferably, a lower toothed ring is connected to the bottom of the rotating shaft by screws. A lower gear is meshed and connected to the outer side of the lower toothed ring. The lower gear is connected to the outer side of the heat exchange tube by screws.

[0011] Preferably, the descaling mechanism includes a hollowed-out plate connected to the inner wall of the condenser by screws. A copper pipe is penetrated and connected in the hollowed-out plate. An upper hollowed-out piece is connected to the inner wall of the condenser above the hollowed-out plate by screws. An ultrasonic vibration rod is penetrated and connected in the upper hollowed-out piece. The ultrasonic vibration rod is placed through the copper pipe.

[0012] Preferably, an ultrasonic vibration rod is connected to the bottom of the upper hollowed-out piece. A steel wire rope is connected to the bottom of the ultrasonic vibration rod by a hook. The steel wire rope is connected to a lower hollowed-out piece by a hook. The lower hollowed-out piece is connected to the inner wall of the condenser by screws.

[0013] Preferably, an ultrasonic generator is connected to one side of the condenser by a bracket.

[0014] Preferably, an electromagnetic three-way valve a is connected to the lower part of the condenser by bolts. A liquid outlet pipe is connected to the rear part of the electromagnetic three-way valve a by bolts. The other end of the liquid outlet pipe is connected to a mixing tank.

[0015] Preferably, a metering pump a is connected to one side of the mixing tank by bolts. The liquid outlet end of the metering pump a is penetrated and connected to one side of the inner wall of the mixing tank. A metering pump b is connected to the upper surface of the mixing tank by bolts. The liquid outlet end of the metering pump b is penetrated and connected to the upper part of the inner wall of the mixing tank. And the liquid inlet end of the metering pump b is connected to a water tank by a pipeline. The water tank is connected to the upper surface of the mixing tank by screws.

[0016] Preferably, an electromagnetic three-way valve b is connected below the mixing tank. One side of the electromagnetic three-way valve b is bolted with a circulation pump. One side of the circulation pump is bolted with a liquid inlet pipe. The other end of the liquid inlet pipe is bolted with an electromagnetic three-way valve c. The electromagnetic three-way valve c is bolted above the condenser.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: In this water-cooled air suspension variable-frequency centrifugal unit, the coolant to be treated is added above the evaporator and flows into the heat exchange tubes, forming a falling film on the inner walls of the heat exchange tubes. The air suspension compressor drives the pneumatic motor to operate, driving the spray pipe and the heat exchange tubes to rotate, so that the refrigerant gas is evenly sprayed on the outer sides of the heat exchange tubes, forming a falling film, and thus enabling the water-cooled air suspension variable-frequency centrifugal unit to have an even falling film.

[0018] 1. In this water-cooled air suspension variable-frequency centrifugal unit, the coolant to be treated is added above the evaporator and flows into the heat exchange tubes. A falling film is formed on the inner walls of the heat exchange tubes. The air suspension compressor compresses the refrigerant to form high-temperature and high-pressure gas, driving the pneumatic motor to operate. The pneumatic motor drives the upper gear ring and the lower gear ring to rotate. The upper gear ring drives the upper gear and the spray pipe to rotate. The lower gear ring drives the lower gear and the heat exchange tubes to rotate, so that the refrigerant gas is evenly sprayed on the outer sides of the heat exchange tubes, forming a falling film, and thus enabling the water-cooled air suspension variable-frequency centrifugal unit to have an even falling film.

[0019] 2. In this water-cooled air suspension variable-frequency centrifugal unit, first, the cooling water in the condenser is drained. Metering pump a pumps a certain amount of water into the mixing tank. Metering pump b pumps a certain amount of concentrated scale inhibitor from the water tank into the mixing tank. After stirring and dilution, it is sent into the condenser by the circulation pump, and then returns to the mixing tank for circulating cleaning. At the same time, the ultrasonic vibration rod is started to vibrate inside the copper tubes, vibrating the scale inhibitor and impacting the inner walls of the copper tubes to remove the scale. After circulating the scale inhibitor several times, the scale inhibitor is discharged from the electromagnetic three-way valve b, and thus enabling the water-cooled air suspension variable-frequency centrifugal unit to assist in scale removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0021] Figure 2 is a three-dimensional structural schematic diagram of the air suspension compressor of the present invention;

[0022] Figure 3 is a three-dimensional structural schematic diagram of the flash evaporator of the present invention;

[0023] Figure 4 is a three-dimensional cross-sectional structural schematic diagram of the evaporator of the present invention;

[0024] Figure 5 is a three-dimensional structural schematic diagram of the connection frame of the present invention;

[0025] Figure 6Schematic diagram of the three-dimensional structure of the lower tooth ring of the present invention;

[0026] Figure 7 Schematic diagram of the three-dimensional cross-sectional structure of the condenser of the present invention;

[0027] Figure 8 Schematic diagram of the front cross-sectional structure of the condenser of the present invention;

[0028] Figure 9 Schematic diagram of the three-dimensional structure of the copper tube of the present invention;

[0029] Figure 10 Schematic diagram of the three-dimensional structure of the mixing tank of the present invention.

[0030] In the figure: 1, frame; 2, condenser; 3, evaporator; 4, air flotation compressor; 5, flash evaporator; 6, heat exchange mechanism; 601, hollowed-out disc; 602, heat exchange tube; 603, air injection pipe; 604, upper gear; 605, upper tooth ring; 606, connecting frame; 607, pneumatic motor; 608, rotating shaft; 609, lower tooth ring; 610, lower gear; 7, descaling mechanism; 701, hollowed-out plate; 702, copper tube; 703, upper hollowed-out piece; 704, ultrasonic vibration rod; 705, steel wire rope; 706, lower hollowed-out piece; 707, electromagnetic three-way valve a; 708, liquid outlet pipe; 709, mixing tank; 710, metering pump a; 711, metering pump b; 712, water tank; 713, electromagnetic three-way valve b; 714, circulation pump; 715, liquid inlet pipe; 716, electromagnetic three-way valve c; 717, ultrasonic generator; 8, return air pipe; 9, inlet air pipe; 10, outlet air pipe; 11, frequency conversion cabinet; 12, control cabinet. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to Figures 1-6, the present invention provides a technical solution: a water-cooled air suspension variable frequency centrifugal unit that can solve the defect of uneven falling film, including: a frame 1, a condenser 2, an evaporator 3, and an air-floating compressor 4; the condenser 2 and the evaporator 3 are connected through the inner wall of the frame 1, one side of the evaporator 3 is connected to the air-floating compressor 4 through a pipeline, the air-floating compressor 4 is connected to one side of the frame 1 by bolts, the front parts of the evaporator 3 and the air-floating compressor 4 are connected to a flash tank 5 through a pipeline, a heat exchange mechanism 6 is connected to the inner wall of the evaporator 3, a descaling mechanism 7 is connected to the inner wall of the condenser 2, a return air pipe 8 is connected above the flash tank 5, the other end of the return air pipe 8 is connected to the air-floating compressor 4, the air outlet end of the air-floating compressor 4 is connected to an inlet air pipe 9, the inlet air pipe 9 is connected through the inner wall of the evaporator 3, an outlet air pipe 10 is connected through the inner wall of the evaporator 3 near the front part of the inlet air pipe 9, the other end of the outlet air pipe 10 is connected through the front part of the inner wall of the condenser 2, a variable frequency cabinet 11 and a control cabinet 12 are connected to the back of the frame 1 by bolts; the heat exchange mechanism 6 includes a hollowed-out disk 601 connected to the inner wall of the evaporator 3 by screws, a heat exchange tube 602 is rotatably penetrated through the inner wall of the hollowed-out disk 601 through a sealed bearing, a jet pipe 603 is rotatably penetrated through the inner wall of the hollowed-out disk 601 near one side of the heat exchange tube 602 through a sealed bearing, an upper gear 604 is connected to the outside of the jet pipe 603 by screws, an upper gear ring 605 is meshed and connected to the outside of the upper gear 604, a connecting frame 606 is welded to the upper surface of the upper gear ring 605, a pneumatic motor 607 is connected above the connecting frame 606 through a coupling, the bracket of the pneumatic motor 607 is connected to the inner wall of the evaporator 3, the air inlet end of the pneumatic motor 607 is connected to the inlet air pipe 9, and the air outlet end of the pneumatic motor 607 is connected to the outlet air pipe 10, a rotating shaft 608 is connected to the bottom of the connecting frame 606, the rotating shaft 608 is rotatably penetrated through the hollowed-out disk 601 through a sealed bearing, a lower gear ring 609 is connected to the bottom of the rotating shaft 608 by screws, a lower gear 610 is meshed and connected to the outside of the lower gear ring 609, and the lower gear 610 is connected to the outside of the heat exchange tube 602 by screws.

[0033] During specific implementation, the coolant to be cooled is added from above the evaporator 3 and flows into the heat exchange tube 602 to form a falling film on the inner wall of the heat exchange tube 602. The refrigerant gas enters the evaporator 3 from the flash tank 5 and then enters multiple jet pipes 603. The air-floating compressor 4 compresses the refrigerant to form high-temperature and high-pressure gas, which enters the pneumatic motor 607 from the inlet air pipe 9 and then is discharged from the outlet air pipe 10, driving the pneumatic motor 607 to operate. The pneumatic motor 607 drives the connecting frame 606, the upper gear ring 605, the rotating shaft 608, and the lower gear ring 609 to rotate. The upper gear ring 605 drives the upper gear 604 and the jet pipe 603 to rotate and sprays the refrigerant gas. The lower gear ring 609 drives the lower gear 610 and the heat exchange tube 602 to rotate, so that the refrigerant gas is evenly sprayed on the outside of the heat exchange tube 602 to form a falling film, cooling the coolant passing through the heat exchange tube 602.

[0034] Refer to Figure 1 、 Figure 2 and Figures 7-10 It can be seen that the descaling mechanism 7 includes a hollow plate 701 connected to the inner wall of the condenser 2 by screws. A copper pipe 702 is connected through the hollow plate 701. An upper hollow piece 703 is connected to the inner wall of the condenser 2 above the hollow plate 701 by screws. An ultrasonic vibration rod 704 is connected through the upper hollow piece 703. The ultrasonic vibration rod 704 is placed through the copper pipe 702. The bottom of the upper hollow piece 703 is connected to the ultrasonic vibration rod 704. The bottom of the ultrasonic vibration rod 704 is connected to a steel wire rope 705 through a hook. The steel wire rope 705 is connected to a lower hollow piece 706 through a hook. The lower hollow piece 706 is connected to the inner wall of the condenser 2 by screws. One side of the condenser 2 is connected to an ultrasonic generator 717 through a bracket. Below the condenser 2, an electromagnetic three-way valve a707 is connected by bolts. The rear part of the electromagnetic three-way valve a707 is connected to a liquid outlet pipe 708 by bolts. The other end of the liquid outlet pipe 708 is connected to a mixing tank 709. One side of the mixing tank 709 is connected to a metering pump a710 by bolts. The liquid outlet end of the metering pump a710 is connected through the inner wall of the mixing tank 709 on one side. The upper surface of the mixing tank 709 is connected to a metering pump b711 by bolts. The liquid outlet end of the metering pump b711 is connected through the inner wall of the mixing tank 709 above. And the liquid inlet end of the metering pump b711 is connected to a water tank 712 through a pipe. The water tank 712 is connected to the upper surface of the mixing tank 709 by screws. Below the mixing tank 709, an electromagnetic three-way valve b713 is connected. One side of the electromagnetic three-way valve b713 is connected to a circulation pump 714 by bolts. One side of the circulation pump 714 is connected to a liquid inlet pipe 715 by bolts. The other end of the liquid inlet pipe 715 is connected to an electromagnetic three-way valve c716 by bolts. The electromagnetic three-way valve c716 is connected to the upper part of the condenser 2 by bolts.

[0035] During specific implementation, first drain the cooling water in the condenser 2, then connect the condenser 2 to the liquid outlet pipe 708 with the electromagnetic three-way valve a707, and connect the condenser 2 to the liquid inlet pipe 715 with the electromagnetic three-way valve c716. The metering pump a710 pumps a certain amount of water into the mixing tank 709. The metering pump b711 pumps a certain amount of concentrated descaling agent in the water tank 712 into the mixing tank 709. After stirring and diluting, it is sent into the condenser 2 from the liquid inlet pipe 715 by the circulation pump 714 and returns to the mixing tank 709 from the liquid outlet pipe 708 for circulating cleaning. At the same time, start the ultrasonic vibration rod 704 to vibrate in the copper pipe 702 with the ultrasonic generator 717, vibrate the descaling agent and generate bubbles to impact the inner wall of the copper pipe 702 to remove the water scale. After circulating the descaling agent several times, disconnect the electromagnetic three-way valve b713 from the circulation pump 714 and connect it to the outside to discharge the descaling agent.

[0036] In summary, when using this water-cooled air suspension variable frequency centrifugal unit, connect the water inlet end of metering pump a710 to the water source with a pipeline, add concentrated scale inhibitor into water tank 712, connect electromagnetic three-way valve c716 and electromagnetic three-way valve a707 to the cooling water pipe structure, connect the upper and lower parts of evaporator 3 to the pipeline of the coolant to be cooled. The coolant to be cooled enters evaporator 3 and is guided by the baffle plate in evaporator 3 to the inner wall of evaporator 3, then falls on the uppermost hollow plate 601 and flows into heat exchange tube 602, forming a falling film along the inner wall of heat exchange tube 602. Operate control cabinet 12 to start air suspension compressor 4 to compress the refrigerant, compress the refrigerant into high-temperature and high-pressure gas, then enter pneumatic motor 607 from intake pipe 9, drive pneumatic motor 607 to operate, and enter condenser 2 from outlet pipe 10, and the heat is taken away by the cooling water. The high-temperature and high-pressure gas refrigerant is transformed into liquid, and then enters flash tank 5. A small part of the liquid refrigerant is sent into air suspension compressor 4 from return pipe 8 by flash tank 5 for air replenishment. Most of the liquid refrigerant becomes low-temperature and low-pressure refrigerant liquid after being depressurized by the throttle valve in flash tank 5 and is sent into evaporator 3, enters rotating spray pipe 603, and is sprayed on rotating heat exchange tube 602 to form a falling film on the surface of heat exchange tube 602, cooling the coolant passing through condenser 2. The low-temperature and low-pressure refrigerant liquid is transformed into low-temperature and low-pressure refrigerant gas and enters air suspension compressor 4 again for compression, continuously circulating. After the coolant to be cooled is cooled, it is sent into equipment such as the indoor unit of the air conditioner by a pump to blow cold air, and the cooling water after absorbing heat is sent into equipment such as a cooling tower by a pump for heat dissipation and cooling. After long-term use, when the scale on the inner wall of copper pipe 702 increases, disconnect the pipeline connected to electromagnetic three-way valve a707, then connect condenser 2 to liquid outlet pipe 708 with electromagnetic three-way valve a707, connect condenser 2 to liquid inlet pipe 715 with electromagnetic three-way valve c716. Metering pump a710 and water tank 712 extract a certain amount of water and concentrated scale inhibitor in proportion and send them into mixing tank 709 for mixing, and then are sent into condenser 2 for circulating flushing by circulating pump 714. Start ultrasonic vibration rod 704 to vibrate the scale inhibitor, make the scale inhibitor impact the inner wall of copper pipe 702 to remove the scale. After circulating the scale inhibitor several times, it is discharged from electromagnetic three-way valve b713, and then reconnect the cooling water pipeline to electromagnetic three-way valve a707. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0037] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A water-cooled air-suspended variable frequency centrifugal unit capable of solving the problem of uneven falling film, comprising: The frame (1), the condenser (2), the evaporator (3) and the air flotation compressor (4) are characterized by: The inner wall of the frame (1) is connected with a condenser (2) and an evaporator (3); one side of the evaporator (3) is connected to an air-floating compressor (4) via a pipeline; the air-floating compressor (4) is connected to one side of the frame (1) via bolts; the front of the evaporator (3) and the air-floating compressor (4) is connected to a flasher (5) via a pipeline; the inner wall of the evaporator (3) is connected to a heat exchange mechanism (6); the inner wall of the condenser (2) is connected to a descaling mechanism (7); and the top of the flasher (5) is connected to a return mechanism (8). An air pipe (8), the other end of the return air pipe (8) is connected to the air flotation compressor (4), the air outlet end of the air flotation compressor (4) is connected to an air inlet pipe (9), the air inlet pipe (9) is connected to the inner wall of the evaporator (3), an air outlet pipe (10) is connected to the inner wall of the evaporator (3) near the front of the air inlet pipe (9), the other end of the air outlet pipe (10) is connected to the front of the inner wall of the condenser (2), and the back of the frame (1) is connected to a frequency conversion cabinet (11) and a control cabinet (12) by bolts; The heat exchange mechanism (6) comprises a hollow plate (601) connected to the inner wall of the evaporator (3) by screws, a heat exchange tube (602) passing through the inner wall of the hollow plate (601) via a sealed bearing and rotatably connected thereto, an injection tube (603) passing through the inner wall of the hollow plate (601) close to the heat exchange tube (602) via a sealed bearing and rotatably connected thereto, an upper gear (604) being connected to the outer side of the injection tube (603) by screws, an upper gear ring (605) being meshingly connected to the outer side of the upper gear (604), a connecting frame (606) being welded to the upper surface of the upper gear ring (605), and a pneumatic motor being connected to the upper side of the connecting frame (606) via a coupling. The air motor (607) reaches (607), the bracket of the air motor (607) is connected to the inner wall of the evaporator (3), the air inlet end of the air motor (607) is connected to the air inlet pipe (9), and the air outlet end of the air motor (607) is connected to the air outlet pipe (10), the bottom of the connecting frame (606) is connected to a rotating shaft (608), the rotating shaft (608) passes through the hollow disk (601) and rotates through a sealed bearing, the bottom of the rotating shaft (608) is connected to a lower gear ring (609) by screws, the outer side of the lower gear ring (609) is meshingly connected to a lower gear (610), and the lower gear (610) is connected to the outer side of the heat exchange tube (602) by screws.

2. According to claim 1, a water-cooled air-suspended variable frequency centrifugal unit capable of solving the problem of uneven falling film is characterized in that: The descaling mechanism (7) comprises a hollow plate (701) connected to the inner wall of the condenser (2) by screws, a copper tube (702) being connected through the hollow plate (701), and an upper hollow plate (703) connected to the inner wall of the condenser (2) near the upper part of the hollow plate (701) by screws, an ultrasonic vibration rod (704) being connected through the upper hollow plate (703), and the ultrasonic vibration rod (704) being placed through the copper tube (702).

3. A water-cooled air-suspended variable frequency centrifugal unit capable of solving the problem of uneven falling film according to claim 2, characterized in that: The bottom of the upper hollow sheet (703) is connected to an ultrasonic vibration rod (704), the bottom of the ultrasonic vibration rod (704) is connected to a steel wire rope (705) via a hook, the steel wire rope (705) is connected to a lower hollow sheet (706) via a hook, and the lower hollow sheet (706) is connected to the inner wall of the condenser (2) via screws.

4. A water-cooled air-suspended variable frequency centrifugal unit capable of solving the problem of uneven falling film according to claim 3, characterized in that: One side of the condenser (2) is connected to an ultrasonic generator (717) via a bracket.

5. A water-cooled air-suspended variable frequency centrifugal unit capable of solving the problem of uneven falling film according to claim 4, characterized in that: An electromagnetic three-way valve a (707) is connected to the bottom of the condenser (2) by means of bolts, a liquid outlet pipe (708) is connected to the rear of the electromagnetic three-way valve a (707) by means of bolts, and the other end of the liquid outlet pipe (708) is connected to a mixing tank (709).

6. A water-cooled air-suspended variable frequency centrifugal unit capable of solving the problem of uneven falling film according to claim 5, characterized in that: A metering pump a (710) is connected to one side of the mixing tank (709) by bolts, and a liquid outlet end of the metering pump a (710) is connected to one side of the inner wall of the mixing tank (709). A metering pump b (711) is connected to the upper surface of the mixing tank (709) by bolts, and a liquid outlet end of the metering pump b (711) is connected to the upper part of the inner wall of the mixing tank (709). A liquid inlet end of the metering pump b (711) is connected to a water tank (712) by a pipeline, and the water tank (712) is connected to the upper surface of the mixing tank (709) by screws.

7. A water-cooled air-suspended variable frequency centrifugal unit capable of solving the problem of uneven falling film according to claim 6, characterized in that: An electromagnetic three-way valve b (713) is connected below the mixing tank (709); one side of the electromagnetic three-way valve b (713) is connected to a circulation pump (714) via bolts; one side of the circulation pump (714) is connected to a liquid inlet pipe (715) via bolts; the other end of the liquid inlet pipe (715) is connected to an electromagnetic three-way valve c (716) via bolts; and the electromagnetic three-way valve c (716) is connected to the top of the condenser (2) via bolts.

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