Multi-effect falling film evaporator

Abstract

The utility model relates to the technical field of evaporators, in particular to a multi-effect falling film evaporator which comprises a rack, a first evaporator is fixed on one side of the rack, a second evaporator is fixed on the other side of the rack, and evaporation mechanisms are arranged on the surfaces of the second evaporator and the first evaporator. A feeding pipe, a heating inner pipe, a heating outer pipe, a steam pipe and a liquid discharging pipe are arranged in the evaporation mechanism, a feed liquid circulating mechanism is arranged on the surfaces of the first evaporator and the second evaporator, the feed liquid circulating mechanism is composed of a circulating assembly and a liquid discharging valve, and an energy-saving mechanism is arranged between the first evaporator and the second evaporator. And the energy-saving mechanism internally comprises an energy-saving component, a water drainage pipe and a control valve, and a mounting mechanism is arranged on the surface of the material guide pipe. According to the utility model, resources required when the evaporator is used are saved, the falling film evaporation effect of feed liquid when the evaporator is used is improved, and the convenience degree when the material guide pipe is mounted on the evaporator is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of evaporators, in particular to a multi-effect falling film evaporator. Background Art

[0002] Falling film evaporation is a process in which the feed liquid is added from the upper tube box of the falling film evaporator heating chamber, and evenly distributed to each heat exchange tube through the liquid distribution and film forming device. Under the action of gravity, vacuum induction and airflow, it flows from top to bottom in a uniform film. During the flow, it is heated and vaporized by the shell-side heating medium, and the generated steam and liquid phase enter the separation chamber of the evaporator together. After the vapor and liquid are fully separated, the steam enters the condenser for condensation or enters the next-effect evaporator as a heating medium, thereby realizing multi-effect operation, and the liquid phase is discharged from the separation chamber.

[0003] It is not easy to make good use of the secondary steam after the use of a general evaporator, and it is a waste of resources to discharge it after condensation; the general feed liquid has a short transportation time in the evaporator casing and is not easy to circulate and evaporate, which reduces the falling film evaporation effect of the feed liquid when the evaporator is used; the feed pipe of the evaporator is generally connected to the feed guide pipe through a flange, and the connection requires the help of tools, which is cumbersome, thereby reducing the convenience of connecting the evaporator to the feed guide pipe. Utility Model Content

[0004] The utility model aims to provide a multi-effect falling film evaporator to solve the problems in the above background technology that the evaporator wastes resources when in use, the falling film evaporation effect of the feed liquid is poor, and the convenience level is low when connecting the feed guide pipe.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a multi-effect falling film evaporator, comprising a frame, a control row key is installed on the surface of the frame, a first evaporator is fixed on one side of the frame, and a second evaporator is fixed on the other side of the frame, a material guide pipe is arranged at the top position of the second evaporator and the first evaporator, and an evaporation mechanism is arranged on the surface of the second evaporator and the first evaporator, and the interior of the evaporation mechanism includes a feed pipe, a heating inner pipe, a heating outer pipe, a steam pipe and a drain pipe, and a liquid circulation mechanism is arranged on the surface of the first evaporator and the second evaporator, and the liquid circulation mechanism consists of a circulation component and a drain valve, an energy-saving mechanism is arranged between the first evaporator and the second evaporator, and the interior of the energy-saving mechanism includes an energy-saving component, a drain pipe and a control valve, and an installation mechanism is arranged on the surface of the material guide pipe, and the installation mechanism consists of a sealing ring and a mounting member.

[0006] Preferably, a feed pipe is welded to the top of the first evaporator and the second evaporator, and the feed pipe and the material guide pipe are plugged into each other, a liquid inlet pipe is fixed to one side of the bottom of the first evaporator and the second evaporator, a steam pipe is fixed to the other side of the bottom of the first evaporator and the second evaporator, and a liquid drain pipe is fixed to the bottom of the first evaporator and the second evaporator.

[0007] Preferably, a heating outer tube is fixed inside the first evaporator and the second evaporator, the heating outer tube is connected to the liquid inlet tube, a heating inner tube is arranged inside the heating outer tube, and the heating inner tube is connected to the feed tube.

[0008] Preferably, the drain valve is installed on the surface of the drain pipe, the input end of the drain valve is electrically connected to the output end of the control row key, and the surfaces of the first evaporator and the second evaporator are provided with circulation components.

[0009] Preferably, the interior of the circulation component includes a reflux pipe, a reflux valve, a material pump and a suction pipe. The material pump is installed on one side of the first evaporator and the second evaporator, and the input end of the material pump is electrically connected to the output end of the control row key. A reflux pipe is fixed to one end of the material pump, and the reflux pipe is connected to the feed pipe. A suction pipe is fixed to the other end of the material pump, and the suction pipe is connected to the discharge pipe. A reflux valve is installed on the surface of the suction pipe and the reflux pipe, and the input end of the reflux valve is electrically connected to the output end of the control row key.

[0010] Preferably, an energy-saving component is installed on the surface of the frame, a drain pipe is fixed to the bottom of the energy-saving component, the drain pipe is connected to the liquid inlet pipe, a control valve is installed on the surface of the drain pipe, and the input end of the control valve is electrically connected to the output end of the control row key.

[0011] Preferably, the interior of the energy-saving component includes a water tank, a nozzle and a water tank. The water tank is fixed on the surface of the frame, and the water tank is connected to a drain pipe. The surface of the water tank is fixed with a water tank, and a nozzle is installed inside the water tank. The input end of the nozzle is electrically connected to the output end of the control row key, and the nozzle is connected to the water tank.

[0012] Preferably, the sealing ring is adhered to the inner wall of the feed pipe, the surface of the sealing ring is tightly fitted with the surface of the feed guide pipe, and a mounting component is arranged on the outer side of the sealing ring.

[0013] Preferably, the interior of the mounting component includes a screw barrel, a turning handle, a positioning stud and a positioning hole. The surface of the guide tube is provided with a positioning hole along the circumferential direction. The interior of the positioning hole is provided with a positioning stud. One end of the positioning stud passes through the positioning hole and is fixedly connected to the surface of the feed tube. The surface of the positioning stud is threadedly sleeved with a screw barrel. The surface of the screw barrel is tightly fitted with the surface of the guide tube. The turning handle is fixed to the surface of the screw barrel.

[0014] Compared with the prior art, the utility model has the following beneficial effects: the multi-effect falling film evaporator not only saves the resources required when the evaporator is used, improves the falling film evaporation effect of the liquid when the evaporator is used, but also improves the convenience of installing the material guide pipe of the evaporator;

[0015] By setting an energy-saving mechanism, the steam generated by evaporation inside the control row key enters the water tank through the steam pipe, and then the control row key is operated to control the nozzle to open, and the cold water inside the water tank is sprayed into the water tank. At this time, the cold water is mixed with the steam sprayed from the steam pipe to heat the cold water. Then the control valve is controlled to open, so that the heated water is discharged to the inside of the liquid inlet pipe through the drain pipe, providing hot liquid medium for the second evaporator, so as to realize the evaporator's reuse function of steam, thereby saving resources required when the evaporator is used;

[0016] By providing a liquid circulation mechanism, operating the control row key, the control row key controls the liquid discharge valve to be closed, and controls the reflux valve to be opened, and then the control row key controls the material pump to work, so that the material pump sucks the discharged liquid into the liquid suction pipe, and refluxes it into the first evaporator and the second evaporator through the reflux pipe, so that the liquid is evaporated again, so as to realize the circulating evaporation function of the evaporator on the liquid, thereby improving the falling film evaporation effect of the liquid when the evaporator is used;

[0017] By providing an installation mechanism, one end of the material guide pipe is inserted into the feed pipe, and the material guide pipe and the feed pipe are sealed under the action of the sealing ring. At this time, the positioning hole is sleeved onto the surface of the positioning stud, and the material guide pipe and the feed pipe are quickly positioned and connected. Then, the screw barrel is sleeved onto the surface of the positioning stud, and the handle is rotated to drive the screw barrel to rotate. The material guide pipe and the feed pipe are fixed under the thread cooperation of the screw barrel and the positioning stud, so as to realize the function of facilitating the installation of the material guide pipe on the evaporator, thereby improving the convenience of installing the material guide pipe on the evaporator. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional appearance structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0020] Figure 3It is an enlarged structural diagram of the energy-saving mechanism of the utility model;

[0021] Figure 4 It is an enlarged structural diagram of the installation mechanism of the utility model.

[0022] In the figure: 1, rack; 101, control row key; 102, first evaporator; 103, second evaporator; 104, material guide pipe; 2, evaporation mechanism; 201, feed pipe; 202, heating inner pipe; 203, heating outer pipe; 204, steam pipe; 205, drain pipe; 206, liquid inlet pipe; 3, liquid circulation mechanism; 301, circulation component; 3011, reflux pipe; 3012, reflux valve; 3013, reflux valve; 3014, reflux valve; 3015, reflux valve; 3016, reflux valve; 3017, reflux valve; 3018, reflux valve; 3019, reflux valve; 3020, reflux valve; 3021, reflux valve; 3022, reflux 013, material pump; 3014, suction tube; 302, discharge valve; 4, energy-saving mechanism; 401, energy-saving component; 4011, water tank; 4012, nozzle; 4013, water tank; 402, drain pipe; 403, control valve; 5, installation mechanism; 501, sealing ring; 502, installation component; 5021, screw barrel; 5022, turning handle; 5023, positioning stud; 5024, positioning hole. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. In addition, the terms "first", "second", "third", "upper, lower, left, right", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. At the same time, in the description of the present invention, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] The utility model provides a multi-effect falling film evaporator having a structure as follows Figure 1 and Figure 2As shown, it includes a frame 1, a control row key 101 is installed on the surface of the frame 1, and the model of the control row key 101 can be selected from the LA series. A first evaporator 102 is fixed on one side of the frame 1, and a second evaporator 103 is fixed on the other side of the frame 1. A material guide pipe 104 is arranged at the top position of the second evaporator 103 and the first evaporator 102. The surfaces of the second evaporator 103 and the first evaporator 102 are both provided with an evaporation mechanism 2. The interior of the evaporation mechanism 2 includes a feed pipe 201, a heating inner pipe 202, a heating outer pipe 203, a steam pipe 204 and a drain pipe 205. The tops of the first evaporator 102 and the second evaporator 103 are both welded with The feed pipe 201 and the feed guide pipe 104 are plugged into each other, a liquid inlet pipe 206 is fixed on one side of the bottom position of the first evaporator 102 and the second evaporator 103, a steam pipe 204 is fixed on the other side of the bottom position of the first evaporator 102 and the second evaporator 103, a liquid discharge pipe 205 is fixed on the bottom of the first evaporator 102 and the second evaporator 103, a heating outer tube 203 is fixed inside the first evaporator 102 and the second evaporator 103, the heating outer tube 203 is connected to the liquid inlet pipe 206, a heating inner tube 202 is arranged inside the heating outer tube 203, and the heating inner tube 202 is connected to the feed pipe 201.

[0025] When in use, the hot liquid medium is guided to the interior of the heating outer tube 203 through the liquid inlet pipe 206. At the same time, the feed liquid is guided to the interior of the feed pipe 201 through the feed guide pipe 104, and flows along the feed pipe 201 to the interior of the heating inner tube 202. Under the action of gravity, vacuum induction and airflow, the feed liquid flows from top to bottom in a uniform film. During the flow, it is heated and vaporized by the shell-side heating medium. The generated steam and liquid phase enter the separation chamber at the bottom of the first evaporator 102 together. At this time, the feed liquid can be discharged through the drain pipe 205, and the steam is discharged through the steam pipe 204, so as to realize the multi-effect falling film evaporation function of the evaporator.

[0026] Furthermore, if Figure 2As shown, the surfaces of the first evaporator 102 and the second evaporator 103 are provided with a liquid circulation mechanism 3, which is composed of a circulation component 301 and a drain valve 302. The drain valve 302 is installed on the surface of the drain pipe 205. The model of the drain valve 302 can be selected from the TM series. The input end of the drain valve 302 is electrically connected to the output end of the control row key 101. The surfaces of the first evaporator 102 and the second evaporator 103 are provided with a circulation component 301. The interior of the circulation component 301 includes a reflux pipe 3011, a reflux valve 3012, a material pump 3013 and a liquid suction pipe 3014. The first evaporator 102 and the second evaporator 1 A material pump 3013 is installed on one side of 03, and the model of the material pump 3013 can be selected from the SLG series. The input end of the material pump 3013 is electrically connected to the output end of the control row key 101, and a reflux pipe 3011 is fixed to one end of the material pump 3013, and the reflux pipe 3011 is connected to the feed pipe 201. A suction pipe 3014 is fixed to the other end of the material pump 3013, and the suction pipe 3014 is connected to the discharge pipe 205. A reflux valve 3012 is installed on the surface of the suction pipe 3014 and the reflux pipe 3011, and the model of the reflux valve 3012 can be selected from the TM series. The input end of the reflux valve 3012 is electrically connected to the output end of the control row key 101.

[0027] When in use, operate the control row key 101, so that the control row key 101 controls the discharge valve 302 to close, and controls the reflux valve 3012 to open, and then controls the control row key 101 to control the material pump 3013 to work, so that the material pump 3013 sucks the discharged material into the suction pipe 3014, and refluxes to the first evaporator 102 and the second evaporator 103 through the reflux pipe 3011, so that the material liquid is evaporated again to realize the evaporator's circulating evaporation function of the material liquid.

[0028] Furthermore, if Figure 3 As shown, an energy-saving mechanism 4 is arranged between the first evaporator 102 and the second evaporator 103, and the interior of the energy-saving mechanism 4 includes an energy-saving component 401, a drain pipe 402 and a control valve 403. The energy-saving component 401 is installed on the surface of the frame 1, and a drain pipe 402 is fixed to the bottom of the energy-saving component 401. The drain pipe 402 is connected to the liquid inlet pipe 206, and a control valve 403 is installed on the surface of the drain pipe 402. The model of the control valve 403 can be selected from the TM series. The input end of the control valve 403 is connected to the control key 101. The output end is electrically connected, and the interior of the energy-saving component 401 includes a water tank 4011, a nozzle 4012 and a water tank 4013. The surface of the frame 1 is fixed with the water tank 4013, and the water tank 4013 is connected with the drain pipe 402. The surface of the water tank 4013 is fixed with the water tank 4011, and the interior of the water tank 4013 is installed with the nozzle 4012. The model of the nozzle 4012 can be selected from the SK series. The input end of the nozzle 4012 is electrically connected to the output end of the control row key 101, and the nozzle 4012 is connected with the water tank 4011.

[0029] When in use, the steam generated by evaporation inside the control row key 101 enters the water tank 4013 through the steam pipe 204, and then the control row key 101 is operated to control the nozzle 4012 to open, and the cold water inside the water tank 4011 is sprayed into the water tank 4013. At this time, the cold water is mixed with the steam sprayed from the steam pipe 204 to heat the cold water. Then the control valve 403 is controlled to open, so that the heated water is discharged to the inside of the liquid inlet pipe 206 through the drain pipe 402, providing hot liquid medium for the second evaporator 103, so as to realize the evaporator's function of reusing steam.

[0030] Furthermore, if Figure 4 As shown, the surface of the guide tube 104 is provided with a mounting mechanism 5, and the mounting mechanism 5 is composed of a sealing ring 501 and a mounting component 502. The sealing ring 501 is adhered to the inner wall of the feed tube 201, and the surface of the sealing ring 501 is tightly fitted with the surface of the guide tube 104. The outer side of the sealing ring 501 is provided with a mounting component 502, and the interior of the mounting component 502 includes a screw barrel 5021, a turning handle 5022, a positioning stud 5023 and a positioning hole 5024. The surface of the guide tube 104 is provided with a positioning hole 5024 along the circumferential direction, and the interior of the positioning hole 5024 is provided with a positioning stud 5023, one end of the positioning stud 5023 passes through the positioning hole 5024 and is fixedly connected to the surface of the feed tube 201, the surface of the positioning stud 5023 is threadedly sleeved with a screw barrel 5021, the surface of the screw barrel 5021 is tightly fitted with the surface of the guide tube 104, and the turning handle 5022 is fixed to the surface of the screw barrel 5021.

[0031] When in use, one end of the guide tube 104 is inserted into the feed tube 201, and the guide tube 104 and the feed tube 201 are sealed under the action of the sealing ring 501. At this time, the positioning hole 5024 is sleeved onto the surface of the positioning stud 5023, and the guide tube 104 and the feed tube 201 are quickly positioned and docked. Then, the screw barrel 5021 is sleeved onto the surface of the positioning stud 5023, and the handle 5022 is rotated to make the handle 5022 drive the screw barrel 5021 to rotate. The guide tube 104 and the feed tube 201 are fixed under the threaded cooperation of the screw barrel 5021 and the positioning stud 5023, so as to realize the function of facilitating the installation of the guide tube 104 of the evaporator.

[0032] Working principle: When in use, first insert one end of the guide tube 104 into the feed tube 201, and under the action of the sealing ring 501, the guide tube 104 and the feed tube 201 are sealed. At this time, the positioning hole 5024 is sleeved onto the surface of the positioning stud 5023, and the guide tube 104 and the feed tube 201 are quickly positioned and docked. Then, the screw barrel 5021 is sleeved onto the surface of the positioning stud 5023, and the handle 5022 is rotated to make the handle 5022 drive the screw barrel 5021 to rotate. The guide tube 104 and the feed tube 201 are fixed under the thread cooperation of the screw barrel 5021 and the positioning stud 5023, so as to realize the function of facilitating the installation of the guide tube 104 on the evaporator, thereby improving the convenience of installing the guide tube 104 on the evaporator.

[0033] Subsequently, the hot liquid medium is guided to the interior of the heating outer tube 203 through the liquid inlet pipe 206. At the same time, the feed liquid is guided to the interior of the feed pipe 201 through the feed guide pipe 104, and flows along the feed pipe 201 to the interior of the heating inner tube 202. Under the action of gravity, vacuum induction and airflow, the feed liquid flows from top to bottom in a uniform film shape. During the flow, it is heated and vaporized by the shell-side heating medium. The generated steam and liquid phase enter the separation chamber at the bottom of the first evaporator 102 together. At this time, the feed liquid can be discharged through the drain pipe 205, and the steam is discharged through the steam pipe 204, so as to realize the multi-effect falling film evaporation function of the evaporator.

[0034] At this time, the control row key 101 can be operated to control the discharge valve 302 to close and the reflux valve 3012 to open. Then the control row key 101 can be controlled to control the material pump 3013 to work, so that the material pump 3013 sucks the discharged material into the suction pipe 3014, and refluxes to the first evaporator 102 and the second evaporator 103 through the reflux pipe 3011, so that the material liquid is evaporated again to realize the circulating evaporation function of the evaporator on the material liquid, thereby improving the falling film evaporation effect of the material liquid when the evaporator is in use.

[0035] At the same time, the steam generated by evaporation inside the control key 101 enters the water tank 4013 through the steam pipe 204, and then the control key 101 is operated to control the nozzle 4012 to open, and the cold water inside the water tank 4011 is sprayed into the water tank 4013. At this time, the cold water is mixed with the steam sprayed from the steam pipe 204 to heat the cold water. Then the control valve 403 is controlled to open, so that the heated water is discharged to the inside of the liquid inlet pipe 206 through the drain pipe 402, providing hot liquid medium for the second evaporator 103, so as to realize the evaporator's function of reusing steam, thereby saving the resources required for the use of the evaporator, and finally completing the use of the evaporator.

[0036] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A multiple-effect falling film evaporator, comprising a frame (1), characterized in that: A control row of keys (101) is installed on the surface of the frame (1); a first evaporator (102) is fixed on one side of the frame (1); a second evaporator (103) is fixed on the other side of the frame (1); a material guide pipe (104) is arranged at the top of the second evaporator (103) and the first evaporator (102); an evaporation mechanism (2) is arranged on the surface of the second evaporator (103) and the first evaporator (102); the interior of the evaporation mechanism (2) includes a feed pipe (201), a heating inner pipe (202), a heating outer pipe (203), a steam pipe (204) and a liquid discharge pipe (205). 05), a liquid circulation mechanism (3) is provided on the surface of the first evaporator (102) and the second evaporator (103), the liquid circulation mechanism (3) is composed of a circulation component (301) and a drain valve (302), an energy-saving mechanism (4) is provided between the first evaporator (102) and the second evaporator (103), the energy-saving mechanism (4) includes an energy-saving component (401), a drain pipe (402) and a control valve (403), and a mounting mechanism (5) is provided on the surface of the material guide pipe (104), the mounting mechanism (5) is composed of a sealing ring (501) and a mounting component (502).

2. A multiple-effect falling film evaporator according to claim 1, characterized in that: A feed pipe (201) is welded to the top of each of the first evaporator (102) and the second evaporator (103); the feed pipe (201) and the guide pipe (104) are plugged into each other; a liquid inlet pipe (206) is fixed to one side of the bottom of each of the first evaporator (102) and the second evaporator (103); a steam pipe (204) is fixed to the other side of the bottom of each of the first evaporator (102) and the second evaporator (103); and a liquid drain pipe (205) is fixed to the bottom of each of the first evaporator (102) and the second evaporator (103).

3. A multiple-effect falling film evaporator according to claim 2, characterized in that: A heating outer tube (203) is fixed inside the first evaporator (102) and the second evaporator (103), the heating outer tube (203) is connected to the liquid inlet tube (206), a heating inner tube (202) is arranged inside the heating outer tube (203), and the heating inner tube (202) is connected to the feed tube (201).

4. A multiple-effect falling film evaporator according to claim 1, characterized in that: The drain valve (302) is installed on the surface of the drain pipe (205), the input end of the drain valve (302) is electrically connected to the output end of the control key (101), and the surfaces of the first evaporator (102) and the second evaporator (103) are provided with circulation components (301).

5. A multiple-effect falling film evaporator according to claim 4, characterized in that: The circulation component (301) comprises a reflux pipe (3011), a reflux valve (3012), a material pump (3013) and a liquid suction pipe (3014). The material pump (3013) is installed on one side of the first evaporator (102) and the second evaporator (103). The input end of the material pump (3013) is electrically connected to the output end of the control row key (101). The reflux pipe (3011) is fixed to one end of the material pump (3013). 11), the reflux pipe (3011) is connected to the feed pipe (201), a liquid suction pipe (3014) is fixed to the other end of the material pump (3013), the liquid suction pipe (3014) is connected to the liquid discharge pipe (205), a reflux valve (3012) is installed on the surface of the liquid suction pipe (3014) and the reflux pipe (3011), and the input end of the reflux valve (3012) is electrically connected to the output end of the control row key (101).

6. A multiple-effect falling film evaporator according to claim 1, characterized in that: An energy-saving component (401) is installed on the surface of the frame (1); a drain pipe (402) is fixed to the bottom of the energy-saving component (401); the drain pipe (402) is connected to the liquid inlet pipe (206); a control valve (403) is installed on the surface of the drain pipe (402); an input end of the control valve (403) is electrically connected to an output end of the control key (101).

7. A multiple-effect falling film evaporator according to claim 6, characterized in that: The energy-saving component (401) comprises a water tank (4011), a nozzle (4012) and a water tank (4013) inside; the water tank (4013) is fixed on the surface of the frame (1); the water tank (4013) is connected to the drain pipe (402); the water tank (4011) is fixed on the surface of the water tank (4013); the nozzle (4012) is installed inside the water tank (4013); the input end of the nozzle (4012) is electrically connected to the output end of the control row key (101); the nozzle (4012) is connected to the water tank (4011).

8. A multiple-effect falling film evaporator according to claim 1, characterized in that: The sealing ring (501) is adhered to the inner wall of the feed pipe (201), the surface of the sealing ring (501) is tightly fitted with the surface of the guide pipe (104), and a mounting component (502) is provided on the outer side of the sealing ring (501).

9. A multiple-effect falling film evaporator according to claim 8, characterized in that: The interior of the mounting component (502) comprises a screw barrel (5021), a turning handle (5022), a positioning stud (5023) and a positioning hole (5024); the surface of the material guide tube (104) is provided with a positioning hole (5024) in a circumferential direction; the interior of the positioning hole (5024) is provided with a positioning stud (5023); one end of the positioning stud (5023) passes through the positioning hole (5024) and is fixedly connected to the surface of the feed tube (201); the surface of the positioning stud (5023) is threadedly sleeved with a screw barrel (5021); the surface of the screw barrel (5021) is tightly fitted with the surface of the material guide tube (104); and the turning handle (5022) is fixed to the surface of the screw barrel (5021).

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