Falling film evaporation device capable of uniformly distributing feed liquid

Abstract

The utility model provides a falling film evaporation device capable of evenly distributing feed liquid, and relates to the field of evaporators, the falling film evaporation device comprises an evaporator barrel and a gas-liquid separator on the right side, two supporting plates are fixedly connected to the interior of the evaporator barrel, a plurality of falling film pipes are fixedly installed in the two supporting plates, and the two supporting plates are fixedly connected to the gas-liquid separator; a connecting disc is arranged on the upper side of the supporting plate on the upper side, a distribution cylinder is arranged in the connecting disc, and a plurality of liquid outlets are formed in the bottom wall of the distribution cylinder. The distribution cylinder can be driven to rotate by starting the motor through an external controller, and the feed liquid forms stable circulation in the distribution cylinder in the radial uniform diffusion and rotation process by utilizing centrifugal force, so that a retention area caused by relatively high viscosity or flow fluctuation is effectively avoided, load balance of each falling film tube is ensured, and the service life of the falling film tube is prolonged. The uniformity of material liquid distribution is improved, and the adaptability of the system to different materials is enhanced, so that the evaporation efficiency and the heat energy utilization rate are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of evaporator, specifically, relate to a kind of even distribution of material liquid falling film evaporator device. BACKGROUND

[0002] The falling film evaporator is a kind of evaporator that is widely used, and a distributor is arranged in the falling film evaporator. The distributor is used to uniformly distribute the material liquid to each falling film tube. The material liquid flows downward in the form of film in the falling film tube. During the flowing process, the material liquid is heated and vaporized by the heating medium. The generated steam and the non-vaporized liquid phase enter the separation device for separation. The falling film evaporator mainly utilizes the film evaporation mechanism, and has the characteristics of low evaporation temperature, fast evaporation speed and short residence time.

[0003] In the prior art, the Chinese utility model patent with publication number CN221309549U discloses a falling film evaporator. The prior art uses a distribution disc to pour the material liquid from the feed inlet of the cylinder cover into the evaporator cylinder. The subsequent distribution by the distribution disc achieves the purpose of uniform distribution of the material liquid. However, in actual use, although the prior art can achieve the basic distribution function, the distribution disc is fixed, which leads to the dependence of the material liquid distribution on the fluid weight and static flow guide. There are certain limitations. For example, when dealing with material liquid with high viscosity or flow fluctuation, a stagnant zone may be formed on the surface of the distribution disc, which leads to excessive load on some falling film tubes and insufficient material liquid on other falling film tubes, affecting the evaporation uniformity and thermal efficiency. Therefore, we propose a falling film evaporator device that can uniformly distribute material liquid to solve the above problems. UTILITY MODEL CONTENTS

[0004] The utility model aims to solve the problem of inconvenient use of the current falling film evaporator device.

[0005] To achieve the above utility model purposes and improve the above problems, the utility model provides a falling film evaporator device that can uniformly distribute material liquid. The device includes an evaporator cylinder and a gas-liquid separator on the right side. The inside of the evaporator cylinder is fixedly connected with two support plates. The inside of the two support plates is fixedly installed with a plurality of falling film tubes. The upper side of the upper support plate is provided with a connecting disc. The inside of the connecting disc is provided with a distribution cylinder. The bottom wall of the distribution cylinder is provided with a plurality of liquid discharge ports. The outside of the distribution cylinder is provided with a rotating cylinder. The rotating cylinder is rotatably connected to the inside of the evaporator cylinder. The outside of the distribution cylinder is provided with a vibration mechanism. The surface of the upper support plate is provided with a communication mechanism. The surface of the evaporator cylinder is provided with a driving mechanism.

[0006] As the preferred technical scheme of the present application, the communication mechanism comprises three connecting rings, the diameters of the three connecting rings increase successively from inside to outside, the inside of each of the three connecting rings is provided with a flow guide groove, the bottom wall of the flow guide groove is provided with a plurality of sunken liquid collecting grooves, and the sunken liquid collecting grooves are communicated with the falling film tubes.

[0007] As the preferred technical scheme of the present application, the three connecting rings are rotatably connected with the connecting disc, the lower surface of the distribution cylinder and the upper surface of the connecting disc are fixedly connected with an extension tube, and the liquid discharge port is communicated with the flow guide groove through the extension tube.

[0008] As the preferred technical scheme of the present application, the inside of each of the two guide grooves is fixedly connected with a guide rod, the outer wall surface of the distribution cylinder is fixedly connected with guide blocks equal in number to the guide grooves, the distribution cylinder is slidably connected with the rotating cylinder through the guide blocks, the surface of the guide block is fixedly connected with two damping springs, the other ends of the two damping springs are respectively fixedly connected with the inner walls of the two sides of the guide groove, and the damping springs are movably sleeved on the outside of the guide rod.

[0009] As the preferred technical scheme of the present application, the driving mechanism comprises a protection box, the protection box is fixedly connected to the surface of the evaporator cylinder body, the surface of the evaporator cylinder body is fixedly connected with a motor, the motor is located in the inside of the protection box, the surface of the evaporator cylinder body is provided with a through groove, the inside of the protection box is rotatably connected with a transmission gear through a shaft body, the output shaft of the motor is fixedly connected with the transmission gear through a shaft coupling, the surface of the rotating cylinder is provided with a gear slot, and the transmission gear is meshingly connected with the rotating cylinder through the gear slot.

[0010] As the preferred technical scheme of the present application, the vibration mechanism comprises a fixed ring, the fixed ring is movably sleeved on the outside of the distribution cylinder, and the fixed ring is located on the lower side of the rotating cylinder, the bottom surface of the fixed ring is movably sleeved with a plurality of rolling balls, the inner wall of the evaporator cylinder body is provided with an annular groove, the fixed ring extends into the inside of the annular groove, and the fixed ring is in contact with the bottom wall of the annular groove through the rolling balls.

[0011] As the preferred technical scheme of the present application, the lower surface of the fixed ring is fixedly connected with at least two first fixed rods, and the outside of each of the first fixed rods is slidably sleeved with a second fixed rod, and the second fixed rod is fixedly connected with the connecting disc.

[0012] As the preferred technical scheme of the present application, the bottom wall of the annular groove is fixedly connected with a plurality of protrusions.

[0013] Compared with the prior art, the present application has the following beneficial effects:

[0014] In the scheme of the present application:

[0015] 1. The motor is started by an external controller to drive the rotation of the distribution cylinder, and the liquid is uniformly dispersed in the radial direction by centrifugal force. During the rotation process, the liquid forms a stable circulating flow inside the distribution cylinder, effectively avoiding the stagnant zone caused by high viscosity or flow fluctuation, ensuring the balanced load of each falling film tube, improving the uniformity of liquid distribution, and enhancing the adaptability of the system to different materials, thereby improving the evaporation efficiency and heat utilization rate;

[0016] 2. Through the cooperation between the fixed ring, the ball and the protrusion, the distribution cylinder is periodically vibrated up and down while rotating, which effectively destroys the surface tension and adhesion layer of the liquid at the edge of the discharge port, promotes the gathered liquid to flow smoothly into the expansion pipe, effectively reduces the risk of high viscosity liquid blockage, improves the stability and continuity of the system operation, and reduces the maintenance frequency and downtime. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The structure diagram of the falling film evaporator provided by the present application can uniformly distribute the liquid;

[0018] Figure 2 The cross-sectional structure diagram of the evaporator cylinder of the falling film evaporator provided by the present application can uniformly distribute the liquid;

[0019] Figure 3 The structure diagram of the fixed ring of the falling film evaporator provided by the present application can uniformly distribute the liquid;

[0020] Figure 4 The cross-sectional structure diagram of the rotating cylinder of the falling film evaporator provided by the present application can uniformly distribute the liquid;

[0021] Figure 5 The structure diagram of the rotating cylinder of the falling film evaporator provided by the present application can uniformly distribute the liquid; Figure 3 The enlarged view of A in the figure;

[0022] Figure 6 The structure diagram of the annular groove of the falling film evaporator provided by the present application can uniformly distribute the liquid.

[0023] Indicated in the figure:

[0024] 1, evaporator cylinder; 2, support plate; 3, falling film tube; 4, connecting disc; 5, distribution cylinder; 6, liquid discharge port; 7, rotating cylinder; 8, first fixed rod; 9, second fixed rod; 10, telescopic pipe; 11, connecting ring; 12, protection box; 13, motor; 14, flow guide groove; 15, sunken liquid collecting groove; 16, guide groove; 17, guide block; 18, guide rod; 19, shock absorbing spring; 20, transmission gear; 21, through groove; 22, gear slot; 23, fixed ring; 24, ball; 25, annular groove; 26, protrusion; 27, gas-liquid separator. DETAILED DESCRIPTION

[0025] In order to make the personnel in the technical field better understand the utility model scheme, the technical scheme in the utility model embodiments will be described clearly and completely below in conjunction with the drawings in the utility model embodiments. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the utility model.

[0026] In order to make the personnel in the technical field better understand the utility model scheme, the technical scheme in the utility model embodiments will be described clearly and completely below in conjunction with the drawings.

[0027] It should be noted that the embodiments and the features and technical solutions in the embodiments in the utility model can be combined with each other without conflict.

[0028] It should be noted that: similar signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0029] Embodiment 1

[0030] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6The application discloses a falling film evaporation device capable of uniformly distributing liquid, which comprises an evaporator cylinder 1 and a gas-liquid separator 27 on the right side, two support plates 2 are fixedly connected in the evaporator cylinder 1, a plurality of falling film tubes 3 are fixedly installed in the two support plates 2, a connecting disc 4 is arranged on the upper side of the upper support plate 2, a distribution cylinder 5 is arranged in the connecting disc 4, a plurality of liquid discharge ports 6 are formed in the bottom wall of the distribution cylinder 5, a rotating cylinder 7 is arranged outside the distribution cylinder 5, the rotating cylinder 7 is rotationally connected in the evaporator cylinder 1, a vibrating mechanism is arranged outside the distribution cylinder 5, a communication mechanism is arranged on the surface of the upper support plate 2, and a driving mechanism is arranged on the surface of the evaporator cylinder 1.

[0031] Further, as shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 The communication mechanism comprises three connecting rings 11, the diameters of the three connecting rings 11 gradually increase from inside to outside, flow guide grooves 14 are formed in the interiors of the three connecting rings 11, a plurality of sunken liquid collecting grooves 15 are formed in the bottom walls of the flow guide grooves 14, and the sunken liquid collecting grooves 15 are communicated with the falling film tubes 3.

[0032] In the application, the sunken liquid collecting grooves 15 are formed by locally concaving the bottom walls of the flow guide grooves 14, the high-low difference structure provides clear gravitational potential energy guidance for the flow of the liquid to the liquid discharge ports 6, effectively avoids the problem of poor drainage caused by liquid surface tension or trace residues, and is especially suitable for liquid with high viscosity.

[0033] In the above embodiment, the number of the falling film tubes 3 is the same as the number of the liquid discharge ports 6 and the sunken liquid collecting grooves 15, and the positions are corresponding to each other, so that the circulation of the liquid is facilitated.

[0034] Further, as shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 The three connecting rings 11 are rotationally connected with the connecting disc 4, a plurality of liquid discharge ports 6 are formed in the circumferences of the three flow guide grooves 14, respectively, an extension tube 10 is fixedly connected between the lower surface of the distribution cylinder 5 and the upper surface of the connecting disc 4, the liquid discharge ports 6 are communicated with the flow guide grooves 14 through the extension tube 10, the liquid in the distribution cylinder 5 can enter the interior of the extension tube 10 through the liquid discharge ports 6, then enter the interior of the flow guide grooves 14 from the extension tube 10, and finally enter the interior of the falling film tubes 3 through the sunken liquid collecting grooves 15.

[0035] Further, as shown in Figure 1 、 Figure 2 ,Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, the inner wall of the rotating cylinder 7 is provided with at least two guide grooves 16, and a guide rod 18 is fixedly connected inside each guide groove 16. The outer wall of the dispensing cylinder 5 is fixedly connected with guide blocks 17 in the same number as the guide grooves 16. The dispensing cylinder 5 is slidably connected to the rotating cylinder 7 by means of the guide blocks 17. Two damping springs 19 are fixedly connected to the surface of the guide blocks 17. The other ends of the two damping springs 19 are fixedly connected to the inner walls of the two sides of the guide grooves 16 respectively, and the damping springs 19 are movably sleeved on the outside of the guide rods 18. With the cooperation between the guide blocks 17 and the guide grooves 16, the rotating cylinder 7 can drive the dispensing cylinder 5 to rotate when it rotates.

[0036] Furthermore, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, the drive mechanism includes a protective box 12, which is fixedly connected to the surface of the evaporator cylinder 1. A motor 13 is fixedly connected to the surface of the evaporator cylinder 1, and the motor 13 is located inside the protective box 12. A through groove 21 is provided on the surface of the evaporator cylinder 1. A transmission gear 20 is rotatably connected inside the protective box 12 via a shaft. The output shaft of the motor 13 is fixedly connected to the transmission gear 20 via a coupling. A toothed groove 22 is provided on the surface of the rotating cylinder 7. The transmission gear 20 is meshed with the rotating cylinder 7 via the toothed groove 22. The rotation of the transmission gear 20 can be driven by starting the motor 13 through an external controller, thereby driving the rotation of the rotating cylinder 7.

[0037] Among them, the motor 13 is also equipped with a power supply, wires, controller and microcomputer, etc. Since they are not the main structures, they will not be described in detail in this article.

[0038] Example 2

[0039] The falling film evaporator that can uniformly distribute the feed liquid provided in Example 1 is further optimized, specifically, as follows: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, the vibration mechanism includes a fixed ring 23, which is fixedly sleeved on the outside of the distribution cylinder 5 and located on the lower side of the rotating cylinder 7. Several balls 24 are movably sleeved on the bottom surface of the fixed ring 23. An annular groove 25 is opened on the inner wall of the evaporator cylinder 1. The fixed ring 23 extends into the interior of the annular groove 25, and the fixed ring 23 contacts the bottom wall of the annular groove 25 with the help of the balls 24. The rotation of the distribution cylinder 5 can drive the rotation of the fixed ring 23, thereby making the fixed ring 23 rotate inside the annular groove 25 with the help of the balls 24.

[0040] Furthermore, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, at least two symmetrically distributed first fixing rods 8 are fixedly connected to the lower surface of the fixing ring 23, and a second fixing rod 9 is slidably sleeved on the outside of each first fixing rod 8. The second fixing rod 9 and the connecting plate 4 are fixedly connected. The sliding sleeve fit between the first fixing rod 8 and the second fixing rod 9, and its cross-sectional structure (e.g., using a non-circular cross-section or having a keyway) ensures that the two can slide relative to each other in the axial direction while transmitting torque in the circumferential direction. Through the rigid connection of the first fixing rod 8, the second fixing rod 9 and the fixing ring 23, the rotational movement of the distribution cylinder 5 can be synchronously transmitted to the connecting plate 4, so that the connecting plate 4 and the distribution cylinder 5 rotate synchronously, thereby effectively avoiding the torsional deformation of the telescopic tube 10 connected between them due to the relative rotation of the two.

[0041] Furthermore, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 As shown, the bottom wall of the annular groove 25 is fixedly connected with several protrusions 26. With the help of the protrusions 26, when the fixed ring 23 contacts the protrusions 26 via the ball bearings 24, it will lift the fixed ring 23 upward, thereby driving the distribution cylinder 5 to lift upward. At this time, the damping spring 19 will also produce corresponding elastic deformation. After the ball bearings 24 and the protrusions 26 separate, the elastic potential energy stored in the damping spring 19 will drive the distribution cylinder 5 to reset. By repeating this process, the rotation and vibration of the distribution cylinder 5 can be achieved.

[0042] In addition, the exterior of the evaporator cylinder 1 and the gas-liquid separator 27 are respectively equipped with structures such as a steam inlet, an exhaust port, a condensate outlet, a cylinder cover, a concentrate outlet, and a steam outlet. Since these are all conventional technical means in this field, they will not be described in detail here.

[0043] It should be noted that this device can be easily cleaned during shutdown maintenance. The main moving parts of the drive mechanism and vibration mechanism (such as transmission gear 20, ball bearing 24, and protrusion 26) are all located outside the material flow channel or in easily accessible positions. The telescopic tube 10 is made of a corrosion-resistant and easy-to-clean flexible material, and its connection with the distribution cylinder 5 and connecting plate 4 at both ends is easy to disassemble, facilitating thorough rinsing of the internal flow channel. The guide groove 16, annular groove 25, and other structures are open, with no dead corners for cleaning. Therefore, this design significantly improves the uniformity of material distribution and operational stability without placing an unacceptable burden on the maintainability and cleanability of the equipment.

[0044] The usage process of the falling film evaporator that can uniformly distribute the feed liquid provided by this utility model is as follows:

[0045] The motor 13 can be started by an external controller to drive the rotation of the transmission gear 20. The rotation of the transmission gear 20 can drive the rotation of the rotating cylinder 7. With the cooperation between the guide block 17 and the guide groove 16, the rotating cylinder 7 can drive the distribution cylinder 5 to rotate. The rotation of the distribution cylinder 5 generates centrifugal force, which pushes the internal liquid to diffuse to the outer periphery, forming a preliminary radial distribution.

[0046] In addition, the cooperation between the first fixing rod 8 and the second fixing rod 9 allows the distribution cylinder 5 to rotate, thereby avoiding unnecessary deformation of the telescopic tube 10. The liquid inside the distribution cylinder 5 can then enter the telescopic tube 10 through the drain port 6, and then enter the guide groove 14 from the telescopic tube 10. Finally, it enters the falling film tube 3 through the sinking collection tank 15.

[0047] Simultaneously, the rotation of the distribution cylinder 5 drives the rotation of the fixed ring 23, causing the fixed ring 23 to rotate inside the annular groove 25 with the help of the ball bearing 24. With the help of the protrusion 26, when the fixed ring 23 contacts the protrusion 26 with the ball bearing 24, it will lift the fixed ring 23 upward, thereby driving the distribution cylinder 5 upward. At this time, the damping spring 19 will also produce corresponding elastic deformation. After the ball bearing 24 and the protrusion 26 separate, the elastic potential energy stored in the damping spring 19 will drive the distribution cylinder 5 to reset. This process can be repeated to achieve the rotation and vibration of the distribution cylinder 5. The vibration breaks the viscosity of the liquid at the bottom of the distribution cylinder 5, making it easier to spread. It can also shake off the liquid that has accumulated at the edge of the drain port 6, promoting its smooth flow into the interior of the telescopic tube 10.

[0048] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0049] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A falling film evaporator capable of uniformly distributing liquid feed, characterized in that, The evaporator includes an evaporator cylinder (1) and a gas-liquid separator (27) on the right side. Two support plates (2) are fixedly connected inside the evaporator cylinder (1). Several falling film tubes (3) are fixedly installed inside the two support plates (2). A connecting plate (4) is provided on the upper side of the upper support plate (2). A distribution cylinder (5) is provided inside the connecting plate (4). Several drain ports (6) are opened on the bottom wall of the distribution cylinder (5). A rotating cylinder (7) is provided outside the distribution cylinder (5). The rotating cylinder (7) is rotatably connected to the inside of the evaporator cylinder (1). A vibration mechanism is provided outside the distribution cylinder (5). A communication mechanism is provided on the surface of the upper support plate (2). A driving mechanism is provided on the surface of the evaporator cylinder (1).

2. The falling film evaporator capable of uniformly distributing liquid according to claim 1, characterized in that, The connecting mechanism includes three connecting rings (11), the diameter of the three connecting rings (11) increases sequentially from the inside to the outside, and each of the three connecting rings (11) has a flow guiding groove (14) inside. The bottom wall of the flow guiding groove (14) has several sinking liquid collection tanks (15), and the sinking liquid collection tanks (15) are connected to the falling film tube (3).

3. The falling film evaporator capable of uniformly distributing liquid according to claim 2, characterized in that, All three connecting rings (11) are rotatably connected to the connecting plate (4). A telescopic tube (10) is fixedly connected between the lower surface of the distribution cylinder (5) and the upper surface of the connecting plate (4). The drain port (6) is connected to the flow guide groove (14) through the telescopic tube (10).

4. The falling film evaporator capable of uniformly distributing liquid according to claim 3, characterized in that, The inner wall of the rotating cylinder (7) is provided with at least two guide grooves (16), and a guide rod (18) is fixedly connected inside each guide groove (16). The outer wall of the distribution cylinder (5) is fixedly connected with a number of guide blocks (17) equal to the number of guide grooves (16). The distribution cylinder (5) is slidably connected to the rotating cylinder (7) by means of the guide blocks (17). Two shock-absorbing springs (19) are fixedly connected to the surface of the guide blocks (17). The other ends of the two shock-absorbing springs (19) are fixedly connected to the inner walls of the two sides of the guide groove (16), and the shock-absorbing springs (19) are movably sleeved on the outside of the guide rods (18).

5. A falling film evaporator capable of uniformly distributing liquid feed according to claim 4, characterized in that, The drive mechanism includes a protective box (12), which is fixedly connected to the surface of the evaporator cylinder (1). A motor (13) is fixedly connected to the surface of the evaporator cylinder (1). The motor (13) is located inside the protective box (12). A through groove (21) is provided on the surface of the evaporator cylinder (1). A transmission gear (20) is rotatably connected inside the protective box (12) via a shaft. The output shaft of the motor (13) is fixedly connected to the transmission gear (20) via a coupling. A toothed groove (22) is provided on the surface of the rotating cylinder (7). The transmission gear (20) is meshed with the rotating cylinder (7) via the toothed groove (22).

6. The falling film evaporator capable of uniformly distributing liquid according to claim 5, characterized in that, The vibration mechanism includes a fixed ring (23), which is fixedly sleeved on the outside of the distribution cylinder (5) and located on the lower side of the rotating cylinder (7). Several balls (24) are movably sleeved on the bottom surface of the fixed ring (23). An annular groove (25) is opened on the inner wall of the evaporator cylinder (1). The fixed ring (23) extends into the interior of the annular groove (25) and contacts the bottom wall of the annular groove (25) with the help of the balls (24).

7. A falling film evaporator capable of uniformly distributing liquid feed according to claim 6, characterized in that, At least two first fixing rods (8) are fixedly connected to the lower surface of the fixing ring (23), and a second fixing rod (9) is slidably sleeved on the outside of each first fixing rod (8). The second fixing rod (9) is fixedly connected to the connecting plate (4).

8. A falling film evaporator capable of uniformly distributing liquid feed according to claim 7, characterized in that, The bottom wall of the annular groove (25) is fixedly connected with several protrusions (26).

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