An MVR evaporator

Abstract

This invention discloses an MVR evaporator, belonging to the field of evaporators. The MVR evaporator includes a tank, a stirring assembly, a heat exchanger assembly, a gas-liquid separator, a preheater, a wastewater inlet pipe, a gas pipe, a compressor, a distilled water outlet pipe, and a concentrated liquid outlet pipe. The heat exchanger assembly is fixed inside the tank, comprising an outer ring, an inner ring, and a gas collecting plate. The top of the gas collecting plate is fixedly connected to the outer ring and the inner ring. The stirring assembly has a first stirring end, a second stirring end, and a third stirring end. The first stirring end passes through the top wall of the tank and extends into the inner ring. The second stirring end passes through the top wall of the tank and extends between the inner and outer rings. The third stirring end passes through the side wall of the tank and extends to the outside of the outer ring. This invention employs a design combining a heat exchanger assembly and a stirring assembly, achieving high-efficiency heat exchange between wastewater and the heat exchanger assembly through multiple stirring methods.

Description

Technical Field

[0001] This invention belongs to the field of evaporators, and particularly relates to an MVR evaporator. Background Technology

[0002] MVR evaporation technology has been widely used in industries such as chemical, pharmaceutical, food, beverage, and environmental protection due to its outstanding energy-saving characteristics. In an MVR evaporation system, the MVR evaporator is the core equipment.

[0003] MVR evaporators utilize low-temperature and low-pressure steam technology and clean energy (i.e., electricity) to generate steam, separating moisture from the medium. Specifically, the liquid to be treated is located in the tube side of the evaporator. Under certain temperature and pressure conditions, water reaches its boiling point and vaporizes, evaporating from the tube side of the MVR evaporator as low-quality steam. This low-quality steam is then further compressed by a steam compressor, increasing its temperature and pressure to become high-quality saturated steam. This steam then enters the shell side of the MVR evaporator, where it exchanges heat with the liquid inside the tubes through heat exchange tubes, maintaining the heat required for the liquid's evaporation. This cycle continues, providing the necessary heat for liquid evaporation to the tube side, reducing the demand for external energy. Simultaneously, the water vapor in the shell side condenses into distilled water after heat exchange, thus achieving the separation of water and other substances from the liquid to be treated.

[0004] In existing MVR evaporators, the heat exchange between the wastewater and the heat exchange tubes is incomplete after the wastewater enters the evaporator, resulting in poor heat exchange efficiency, which needs to be improved. Summary of the Invention

[0005] The purpose of this invention is to propose an MVR evaporator that adopts a design combining a heat exchange tube assembly and a stirring assembly. Based on the heat exchange tube assembly, multiple stirring methods are used to achieve high-efficiency heat exchange between wastewater and the heat exchange tube assembly.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This invention provides an MVR evaporator, comprising a tank, a stirring assembly, a heat exchanger assembly, a gas-liquid separator, a preheater, a wastewater inlet pipe, a gas pipe, a compressor, a distilled water outlet pipe, and a concentrate outlet pipe. The heat exchanger assembly is fixed inside the tank, comprising an outer ring, an inner ring, and a gas collecting plate. The top of the gas collecting plate is fixedly connected to the outer ring and the inner ring, with the outer ring surrounding the inner ring. A stirring assembly is fixed to the top of the tank, having a first stirring end, a second stirring end, and a third stirring end. The first stirring end passes through the top wall of the tank and... Extending into the inner ring, the second stirring end passes through the top wall of the tank and extends between the inner and outer rings. The third stirring end passes through the side wall of the tank and extends to the outside of the outer ring. A gas-liquid separator is installed at the top of the tank. The exhaust port of the gas-liquid separator is connected to a gas pipe. A compressor is installed on the gas pipe. The exhaust end of the gas pipe passes through the side wall of the tank and is fixedly connected to the gas collecting plate. A distilled water outlet pipe is fixedly connected to the bottom of the gas collecting plate. A preheater is installed at the bottom of the tank. A wastewater inlet pipe is fixedly connected to one side wall of the bottom of the tank. A concentrated liquid outlet pipe is fixedly connected to the bottom of the tank.

[0008] Preferably, the stirring assembly includes a motor, a first bearing housing, a planetary gear mechanism, a belt drive assembly, a first stirring end, a second stirring end, and a third stirring end. The motor and the first bearing housing are both fixed to the top of the tank. The top end of the first stirring end is fixedly connected to the motor. The bottom end of the first stirring end extends through the first bearing housing and the top wall of the tank to the inner ring. The planetary gear mechanism is disposed on the top wall inside the tank, and its sun gear is fixedly sleeved on the first stirring end. The top end of the second stirring end is fixedly connected to the planetary gears of the planetary gear mechanism. The third stirring end is connected to the first stirring end via the belt drive assembly.

[0009] Preferably, the third stirring end includes a second bearing seat, a first rotating shaft, a first bevel gear, a second bevel gear, a third bearing seat, a second rotating shaft, helical blades, and a sleeve. The left and right side walls of the tank are both fixed with second and third bearing seats. The third bearing seat is located below the second bearing seat. The top end of the first rotating shaft is connected to the belt drive assembly. The bottom end of the first rotating shaft is fixed with a first bevel gear. The outer end of the second rotating shaft is fixed with a second bevel gear. The second bevel gear meshes with the first bevel gear. The inner end of the second rotating shaft passes through the third bearing seat and the side wall of the tank, and extends into the interior of the tank where helical blades are fixed. A sleeve is provided inside the tank, and the sleeve surrounds the helical blades.

[0010] Preferably, the first stirring end includes a third rotating shaft and a plurality of first stirring blades. The top end of the third rotating shaft is fixedly connected to a motor, and a plurality of first stirring blades are fixedly fixed at intervals along the axial direction at the lower part of the third rotating shaft. The first stirring blades are distributed on both the left and right sides of the third rotating shaft, and the first stirring blades on the left and right sides are staggered.

[0011] Preferably, the second stirring end includes a fourth rotating shaft and a plurality of second stirring blades. The top end of the fourth rotating shaft is fixedly connected to a planetary gear, and a plurality of second stirring blades are fixedly fixed at intervals along the axial direction at the lower part of the fourth rotating shaft. The second stirring blades are distributed on both the left and right sides of the fourth rotating shaft, and the second stirring blades on the left and right sides are staggered. The second stirring blades are staggered with the first stirring blades.

[0012] Preferably, a first brush is fixed to the outer end face of both the first stirring blade and the second stirring blade. The first brush has an outwardly inclined brush portion. A brush plate is fixed to the inner end of the second rotating shaft, and a second brush is fixed to the inner side wall of the brush plate.

[0013] Preferably, the planetary gear mechanism includes a mounting sleeve, an annular slide rail, sliders, a planet carrier, planet gears, a gear ring, and a sun gear. The mounting sleeve and the annular slide rail are fixed to the top wall inside the tank. The mounting sleeve surrounds the annular slide rail. Two sliders are slidably connected to the bottom of the annular slide rail. A planet carrier is fixed to the bottom of the sliders. Two planet gears are rotatably connected to the bottom of the planet carrier. Both planet gears mesh with the sun gear. The gear ring is fixedly sleeved on the inner side wall of the mounting sleeve. The gear ring meshes with the two planet gears. The first stirring end passes through the annular slide rail and the planet carrier. The side wall of the mounting sleeve has vent holes.

[0014] Preferably, both the outer and inner rings are formed by several aluminum tubes.

[0015] Preferably, the inner and outer surfaces of the aluminum tube have an oxide layer of 0.3-2 mm, and the outer surface of the oxide layer on the outer surface of the aluminum tube has a polytetrafluoroethylene layer of 0.5-3 mm.

[0016] Preferably, the drain end of the distilled water outlet pipe is fixedly connected to a sleeve-type heat exchanger, which is sleeved on the wastewater inlet pipe.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. By combining the inner and outer rings of the heat exchanger assembly with the first, second, and third stirring ends of the mixing assembly, efficient flow of wastewater inside the tank is achieved, ensuring uniform contact between the wastewater and the heat exchanger assembly, improving the heat exchange efficiency between the wastewater and the heat exchanger assembly, enhancing the high-efficiency heat exchange of wastewater in the evaporator, and increasing the evaporation efficiency.

[0019] 2. The first stirring end stirs the wastewater within the inner ring, while the second stirring end stirs it between the inner and outer rings, significantly improving the flow of wastewater through the inner and outer rings and greatly enhancing the heat exchange efficiency between the wastewater and the heat exchange tube assembly. Furthermore, the third stirring end stirs the wastewater from outside the outer ring in different directions, further improving the heat exchange efficiency between the wastewater and the heat exchange tube assembly.

[0020] 3. By combining a planetary gear mechanism with a belt drive assembly, only one motor is needed to drive three stirring ends for simultaneous stirring operations. Furthermore, the three stirring ends operate in different ways and directions, greatly improving heat exchange efficiency. The motor is a reversible motor; depending on the actual application requirements, different stirring effects can be achieved by rotating the motor in either direction.

[0021] 4. By rotating the spiral blades and using the sleeve, the wastewater is pushed towards the heat exchanger assembly, effectively improving the heat exchange efficiency between the wastewater and the heat exchanger assembly. Alternatively, the motor can be reversed to reverse the spiral blades, drawing the heat-exchanged wastewater out of the heat exchanger assembly, which also improves the heat exchange efficiency between the wastewater and the heat exchanger assembly.

[0022] 5. By combining the first stirring blades offset on the first stirring end with the second stirring blades offset on the second stirring end, the wastewater is efficiently stirred from the inner ring and between the outer and inner rings, respectively, thereby improving the flow of the wastewater and thus improving the heat exchange efficiency between the wastewater and the heat exchange tube assembly.

[0023] 6. Due to the staggered arrangement of the first and second stirring blades, combined with the staggered arrangement of the first and second stirring blades, and the addition of a first brush and a second brush located on the outer side of the outer ring, the brushes can perform all-round brushing to remove dirt from both the inner and outer rings.

[0024] 7. The use of annular slide rails and sliders makes the planetary gear mechanism operate more smoothly and extends its service life. When the first stirring end rotates, it drives the sun gear to rotate, causing the planetary gears to rotate on their own axes and revolve around the first stirring end.

[0025] 8. The PTFE layer prevents unwanted substances from adhering to the aluminum tube, reducing scaling on the outside. The oxide layer prevents corrosion of the aluminum tube. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the main structure of Embodiment 1 of the present invention.

[0027] Figure 2 This is a partial front view schematic diagram of the first stirring end and the second stirring end in Embodiment 1 of the present invention.

[0028] Figure 3 This is a partial structural schematic diagram of the planetary gear mechanism according to Embodiment 1 of the present invention.

[0029] Figure 4 This is a schematic diagram of the cooperation between the heat exchange tube assembly, the first stirring end, and the second stirring end in Embodiment 1 of the present invention.

[0030] Figure 5This is a schematic diagram of the right side of the installation sleeve according to Embodiment 1 of the present invention.

[0031] Figure 6 This is a schematic diagram of the fit between a sleeve and a spiral blade according to an embodiment of the present invention.

[0032] Figure 7 This is a partial cross-sectional view of the aluminum tube in Embodiment 1 of the present invention.

[0033] Figure 8 This is a schematic diagram of the main structure of Embodiment 2 of the present invention.

[0034] Figure 9 This is a schematic diagram showing the combination of the first stirring end, the second stirring end, and the first brush in Embodiment 2 of the present invention.

[0035] Figure 10 This is a schematic diagram of the cooperation between the heat exchange tube assembly, the first stirring end, the second stirring end, and the first brush in Embodiment 2 of the present invention.

[0036] Figure 11 This is a right-side view of the brush plate and the second rotating shaft in Embodiment 2 of the present invention.

[0037] The labels in the attached diagram are as follows: 1-Tank body, 2-Gas-liquid separator, 3-Preheater, 4-Wastewater inlet pipe, 5-Gas pipe, 6-Compressor, 7-Agitator assembly, 8-Heat exchanger assembly, 9-Distilled water outlet pipe, 10-Concentrate outlet pipe, 81-Outer ring, 82-Inner ring, 83-Gas collecting plate, 71-Motor, 72-First bearing housing, 73-Planetary gear mechanism, 74-Belt drive assembly, 75-First agitator end, 76-Second agitator end, 77-Third agitator end, 771-Second bearing housing, 772-First rotating shaft, 773-First bevel gear, 774- Second bevel gear, 775-Third bearing housing, 776-Second rotating shaft, 777-Helical blade, 778-Sleeve, 751-Third rotating shaft, 752-First stirring blade, 761-Fourth rotating shaft, 762-Second stirring blade, 78-First brush, 79-Second brush, 710-Brush plate, 731-Mounting sleeve, 732-Annular slide rail, 733-Slider, 734-Planetary carrier, 735-Planetary gear, 736-Gear ring, 737-Sun gear, 738-Pore, 11-Oxide layer, 12-PTFE layer, 13-Shell-type heat exchanger, 14-Aluminum tube. Detailed Implementation

[0038] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0039] Contents not described in detail in this specification are prior art known to those skilled in the art. In the description of this invention, it should be understood that terms such as "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] Example 1:

[0041] like Figures 1 to 7 As shown, the MVR evaporator provided in this embodiment includes a tank 1, a stirring assembly 7, a heat exchanger assembly 8, a gas-liquid separator 2, a preheater 3, a wastewater inlet pipe 4, a gas pipe 5, a compressor 6, a distilled water outlet pipe 9, and a concentrated liquid outlet pipe 10. The heat exchanger assembly 8 is fixed inside the tank 1. The heat exchanger assembly 8 includes an outer ring portion 81, an inner ring portion 82, and a gas collecting plate 83. The top of the gas collecting plate 83 is fixedly connected to the outer ring portion 81 and the inner ring portion 82. The outer ring portion 81 surrounds the inner ring portion 82. The stirring assembly 7 is fixed to the top of the tank 1. The stirring assembly 7 has a first stirring end 75, a second stirring end 76, and a third stirring end 77. The first stirring end 75 passes through the top wall of the tank 1 and extends into the inner ring portion 82. The second stirring end... 76 passes through the top wall of tank 1 and extends between the inner ring 82 and the outer ring 81. The third stirring end 77 passes through the side wall of tank 1 and extends to the outside of the outer ring 81. A gas-liquid separator 2 is provided at the top inside the tank 1. The exhaust port of the gas-liquid separator 2 is connected to a gas pipe 5. A compressor 6 is provided on the gas pipe 5. The exhaust end of the gas pipe 5 passes through the side wall of tank 1 and is fixedly connected to the gas collecting plate 83. A distilled water outlet pipe 9 is fixedly connected to the bottom of the gas collecting plate 83. A sleeve-type heat exchanger 13 is fixedly connected to the drain end of the distilled water outlet pipe 9. The sleeve-type heat exchanger 13 is sleeved on the wastewater inlet pipe 4. A preheating heater 3 is provided at the bottom of tank 1. The wastewater inlet pipe 4 is fixedly connected to the left side wall of the bottom of tank 1. The concentrate outlet pipe 10 is fixedly connected to the bottom of tank 1.

[0042] Working principle:

[0043] Wastewater enters tank 1 through wastewater inlet pipe 4. The cold wastewater is heated to its boiling point by preheater 3 and continues heating until the evaporator system is filled with steam. The resulting steam, approximately 100°C, enters gas-liquid separator 2 for gas-liquid separation. The separated pure water vapor is compressed and heated to approximately 110°C by compressor 6, which can then be used as a heat source for heat exchange and condensation in the evaporator. During this process, approximately 90% of the heat from the water vapor is recovered and utilized. The efficient flow of wastewater inside tank 1 is achieved through the inner ring 82 combined with the outer ring 81 of the heat exchanger assembly 8, along with the first stirring end 75, second stirring end 76, and third stirring end 77 of the stirring assembly 7. This ensures uniform contact between the wastewater and the heat exchanger assembly 8, improving the heat exchange efficiency between the wastewater and the heat exchanger assembly 8, enhancing the high-efficiency heat exchange of the wastewater in the evaporator, and increasing the evaporation efficiency. The still-hot distilled water (approximately 90°C) after condensation falls into the gas collecting pan 83 and enters the shell-and-tube heat exchanger 13 through the distilled water outlet pipe 9. In the shell-and-tube heat exchanger 13, it is used to preheat the continuously injected wastewater (to maintain the water level in the evaporator), thereby reducing heat energy consumption. During this continuous operation, the concentration of wastewater in tank 1 gradually increases and precipitates out. The high-concentration salt-containing slurry precipitated from the wastewater is discharged through the concentrate outlet pipe 10.

[0044] The stirring assembly 7 includes a motor 71, a first bearing housing 72, a planetary gear mechanism 73, a belt drive assembly 74, a first stirring end 75, a second stirring end 76, and a third stirring end 77. The motor 71 and the first bearing housing 72 are both fixed to the top of the tank body 1. The top end of the first stirring end 75 is fixedly connected to the motor 71, and the bottom end of the first stirring end 75 extends through the first bearing housing 72 and the top wall of the tank body 1 into the inner ring portion 82. The planetary gear mechanism 73 is disposed on the top wall inside the tank body 1, and its sun gear 737 is fixedly sleeved on the first stirring end 75. The top end of the second stirring end 76 is fixedly connected to the planetary gears 735 of the planetary gear mechanism 73. The third stirring end 77 is connected to the first stirring end 75 via the belt drive assembly 74. By using the planetary gear mechanism 73, while the motor 71 drives the first stirring end 75 to rotate and stir, the second stirring end 76 revolves around the first stirring end 75 and simultaneously rotates on its own axis. The first stirring end 75 stirs the wastewater within the inner ring 82, while the second stirring end 76 stirs it between the inner ring 82 and the outer ring 81, significantly improving the flow of wastewater between these sections and greatly enhancing the heat exchange efficiency between the wastewater and the heat exchange tube assembly 8. Furthermore, the third stirring end 77 stirs the wastewater from outside the outer ring 81 in different directions, further improving the heat exchange efficiency. The planetary gear mechanism 73 combined with the belt drive assembly 74 allows a single motor 71 to drive all three stirring ends simultaneously, with different stirring methods and directions, greatly improving heat exchange efficiency. The motor 71 is a reversible motor; different stirring effects can be achieved by rotating it in either direction according to actual usage requirements.

[0045] The third stirring end 77 includes a second bearing seat 771, a first rotating shaft 772, a first bevel gear 773, a second bevel gear 774, a third bearing seat 775, a second rotating shaft 776, a spiral blade 777, and a sleeve 778. The second bearing seat 771 and the third bearing seat 775 are fixed to the left and right side walls of the tank body 1. The third bearing seat 775 is located below the second bearing seat 771. The top end of the first rotating shaft 772 is connected to the belt drive assembly 74. The bottom end of the first rotating shaft 772 is fixed to the first bevel gear 773. The outer end of the second rotating shaft 776 is fixed to the second bevel gear 774. The second bevel gear 774 meshes with the first bevel gear 773. The inner end of the second rotating shaft 776 passes through the third bearing seat 775 and the side wall of the tank body 1, and extends into the interior of the tank body 1 where the spiral blade 777 is fixed. The sleeve 778 is provided inside the tank body 1, and the sleeve 778 surrounds the spiral blade 777. When motor 71 drives the first stirring end 75 to rotate, it synchronously drives the first rotating shaft 772 to rotate via the belt pulley transmission assembly. This causes the first bevel gear 773 to rotate, which in turn drives the second bevel gear 774 to rotate, causing the second rotating shaft 776 to rotate, which in turn drives the spiral blades 777 to rotate. The rotation of the spiral blades 777, combined with the sleeve 778, pushes the wastewater towards the heat exchanger assembly 8, effectively improving the heat exchange efficiency between the wastewater and the heat exchanger assembly 8. Alternatively, motor 71 can be reversed to reverse the spiral blades 777, drawing the heat-exchanged wastewater out of the heat exchanger assembly 8, which also improves the heat exchange efficiency between the wastewater and the heat exchanger assembly 8.

[0046] The first stirring end 75 includes a third rotating shaft 751 and a plurality of first stirring blades 752. The top end of the third rotating shaft 751 is fixedly connected to a motor 71, and the lower part of the third rotating shaft 751 is axially spaced with a plurality of first stirring blades 752. First stirring blades 752 are distributed on both the left and right sides of the third rotating shaft 751, and the first stirring blades 752 on the left and right sides are staggered. The second stirring end 76 includes a fourth rotating shaft 761 and a plurality of second stirring blades 762. The top end of the fourth rotating shaft 761 is fixedly connected to a planetary gear 735, and the lower part of the fourth rotating shaft 761 is axially spaced with a plurality of second stirring blades 762. Second stirring blades 762 are distributed on both the left and right sides of the fourth rotating shaft 761, and the second stirring blades 762 on the left and right sides are staggered. The second stirring blades 762 are staggered from the first stirring blades 752. The wastewater is efficiently stirred from within the inner ring 82 and between the outer ring 81 and the inner ring 82 by the first stirring blade 752 offset from the first stirring blade 752 and the second stirring blade 762 offset from the first stirring blade 752 on the second stirring end 76, thereby improving the flow of the wastewater and thus improving the heat exchange efficiency between the wastewater and the heat exchange tube assembly 8.

[0047] Specifically, the belt drive assembly 74 includes a first pulley, a second pulley, a third pulley, a fourth pulley, a first flat belt, and a second flat belt. The first pulley and the second pulley are both fixedly sleeved on the first stirring end 75. The first pulley is located above the second pulley. The third pulley is fixedly sleeved on the top of the first rotating shaft 772 located on the left side. The fourth pulley is fixedly sleeved on the top of the first rotating shaft 772 located on the right side. The first pulley and the fourth pulley are connected by the first flat belt drive, and the second pulley and the third pulley are connected by the second flat belt drive.

[0048] The planetary gear mechanism 73 includes a mounting sleeve 731, an annular slide rail 732, a slider 733, a planet carrier 734, planetary gears 735, a gear ring 736, and a sun gear 737. The mounting sleeve 731 and the annular slide rail 732 are fixed to the top wall inside the tank 1. The mounting sleeve 731 surrounds the annular slide rail 732. Two sliders 733 are slidably connected to the bottom of the annular slide rail 732. A planet carrier 734 is fixed to the bottom of the sliders 733. Two planetary gears 735 are rotatably connected to the bottom of the planet carrier 734. Both planetary gears 735 mesh with the sun gear 737. The gear ring 736 is fixedly fitted onto the inner side wall of the mounting sleeve 731 and meshes with the two planetary gears 735. The first stirring end 75 passes through the annular slide rail 732 and the planet carrier 734. The side wall of the mounting sleeve 731 has vents 738. The vents 738 allow steam to pass through the mounting sleeve 731 and enter the gas-liquid separator 2. Furthermore, the channel between the mounting sleeve and the gas-liquid separator facilitates the entry of steam into the gas-liquid separator. The arrangement of the annular slide rail 732 and the slider 733 makes the planetary gear mechanism operate more smoothly, improving its service life. When the first stirring end 75 rotates, it drives the sun gear 737 to rotate, causing the planetary gears 735 to rotate on their own axis and simultaneously revolve around the first stirring end 75.

[0049] Both the outer ring 81 and the inner ring 82 are formed by several aluminum tubes 14. Compared with conventional heat exchange tubes made of copper, using heat exchange tubes made of aluminum can reduce manufacturing costs by about 50%.

[0050] The aluminum tube has a 1mm oxide layer 11 on both its inner and outer surfaces, and the outer surface of the oxide layer 11 on the outer surface of the aluminum tube has a 1mm polytetrafluoroethylene (PTFE) layer 12. The PTFE layer 12 prevents unwanted substances from adhering to the aluminum tube, reducing scaling on its exterior. The oxide layer 11 also prevents corrosion of the aluminum tube.

[0051] Example 2:

[0052] like Figures 8 to 11As shown, in this embodiment, a first brush 78 is fixed to the outer end face of both the first stirring blade 752 and the second stirring blade 762. The first brush 78 has an outwardly inclined brush portion. A brush plate 710 is fixed to the inner end of the second rotating shaft 776, and a second brush 79 is fixed to the inner side wall of the brush plate. Due to the staggered arrangement of the first stirring blade 752 and the second stirring blade 762, combined with the staggered arrangement of the first stirring blade 752 and the second stirring blade 762, and the provision of the first brush 78 and the second brush 79 located outside the outer ring portion 81, the brushes can perform all-round brushing to remove dirt from the inner ring portion 82 and the outer ring portion 81.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An MVR evaporator, characterized in that: It includes a tank, agitator, heat exchanger assembly, gas-liquid separator, preheater, wastewater inlet pipe, gas pipe, compressor, distilled water outlet pipe, and concentrate outlet pipe; The tank body is equipped with a heat exchange tube assembly, which includes an outer ring, an inner ring, and a gas collecting plate. The top of the gas collecting plate is fixedly connected to the outer ring and the inner ring, and the outer ring surrounds the inner ring. A stirring assembly is fixed to the top of the tank, and the stirring assembly has a first stirring end, a second stirring end, and a third stirring end; The first stirring end passes through the top wall of the tank and extends into the inner ring portion; the second stirring end passes through the top wall of the tank and extends between the inner ring portion and the outer ring portion; the third stirring end passes through the side wall of the tank and extends to the outside of the outer ring portion. A gas-liquid separator is installed at the top of the interior of the tank. The exhaust port of the gas-liquid separator is connected to a gas pipe. A compressor is installed on the gas pipe. The exhaust end of the gas pipe passes through the side wall of the tank and is fixedly connected to the gas collecting plate. The bottom of the gas collecting plate is fixedly connected to a distilled water outlet pipe; A preheater is provided at the bottom of the tank, the wastewater inlet pipe is fixedly connected to one side wall of the bottom of the tank, and the concentrate outlet pipe is fixedly connected to the bottom of the tank.

2. The MVR evaporator according to claim 1, characterized in that: The stirring assembly includes a motor, a first bearing housing, a planetary gear mechanism, a belt drive assembly, a first stirring end, a second stirring end, and a third stirring end; Both the motor and the first bearing housing are fixed to the top of the tank body; The top end of the first stirring end is fixedly connected to the motor, and the bottom end of the first stirring end extends through the first bearing seat and the top wall of the tank to the inner ring. The planetary gear mechanism is disposed on the top wall inside the tank, and its sun gear is fixedly sleeved on the first stirring end, and the top end of the second stirring end is fixedly connected to the planetary gear of the planetary gear mechanism. The third stirring end is connected to the first stirring end via a belt drive assembly.

3. The MVR evaporator according to claim 2, characterized in that: The third stirring end includes a second bearing housing, a first rotating shaft, a first bevel gear, a second bevel gear, a third bearing housing, a second rotating shaft, spiral blades, and a sleeve; The left and right side walls of the tank are each fixed with a second bearing seat and a third bearing seat. The third bearing seat is located below the second bearing seat. The top end of the first rotating shaft is connected to the belt drive assembly. The bottom end of the first rotating shaft is fixed with a first bevel gear. The outer end of the second rotating shaft is fixed with a second bevel gear, which meshes with the first bevel gear. The inner end of the second rotating shaft passes through the third bearing seat and the side wall of the tank, and extends into the interior of the tank where a helical blade is fixed. The tank body is provided with a sleeve that surrounds the spiral blades.

4. The MVR evaporator according to claim 3, characterized in that: The first stirring end includes a third rotating shaft and a plurality of first stirring blades; The top end of the third rotating shaft is fixedly connected to the motor, and a number of first stirring blades are fixedly fixed at intervals along the axial direction at the lower part of the third rotating shaft. The first stirring blades are distributed on both the left and right sides of the third rotating shaft, and the first stirring blades on the left and right sides are staggered.

5. The MVR evaporator according to claim 4, characterized in that: The second stirring end includes a fourth rotating shaft and several second stirring blades; The top end of the fourth rotating shaft is fixedly connected to the planetary gear, and a number of second stirring blades are fixedly fixed at intervals along the axial direction at the lower part of the fourth rotating shaft. The second stirring blades are distributed on both the left and right sides of the fourth rotating shaft, and the second stirring blades on the left and right sides are staggered. The second stirring blade is offset from the first stirring blade.

6. The MVR evaporator according to claim 5, characterized in that: The outer end faces of the first stirring blade and the second stirring blade are both fixed with a first brush, and the first brush has an outwardly inclined brush portion. A brush plate is fixed to the inner end of the second rotating shaft, and a second brush is fixed to the inner side wall of the brush plate.

7. The MVR evaporator according to claim 2, characterized in that: The planetary gear mechanism includes a mounting sleeve, an annular slide rail, a slider, a planet carrier, planet gears, a gear ring, and a sun gear; The top wall inside the tank is fixed with an installation sleeve and an annular slide rail. The installation sleeve surrounds the annular slide rail. Two sliders are slidably connected to the bottom of the annular slide rail. A planetary carrier is fixed to the bottom of the sliders. Two planetary gears are rotatably connected to the bottom of the planetary carrier. Both planetary gears mesh with the sun gear; The gear ring is fixedly sleeved on the inner side wall of the mounting sleeve, and the gear ring meshes with the two planetary gears; The first stirring end passes through the annular slide rail and the planetary carrier; The sidewall of the mounting sleeve has air holes.

8. The MVR evaporator according to claim 1, characterized in that: Both the outer and inner rings are formed by several aluminum tubes.

9. The MVR evaporator according to claim 8, characterized in that: The aluminum tube has an oxide layer of 0.3-2 mm on both its inner and outer surfaces, and the outer surface of the oxide layer on the outer surface of the aluminum tube has a polytetrafluoroethylene layer of 0.5-3 mm.

10. The MVR evaporator according to claim 1, characterized in that: The drain end of the distilled water outlet pipe is fixedly connected to a sleeve-type heat exchanger, which is sleeved on the wastewater inlet pipe.

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