Internal cleaning device for double-effect external circulation evaporation preheater

Abstract

The utility model discloses an internal cleaning device for a double-effect external circulation evaporation preheater, which relates to the technical field of double-effect external circulation evaporation preheaters and comprises an evaporation device, a condensing device fixedly mounted at the top of the evaporation device, a double-effect external circulation device fixedly mounted at the top of the condensing device and an opening and closing device fixedly mounted at the bottom of the evaporation device. The scrubbing device is arranged under the opening and closing device, and the waste residue recycling device is fixedly installed at the bottom of the opening and closing device. Through the opening and closing device and the scrubbing device, internal cleaning can be completed without dismounting the device, and time and labor are saved; a small amount of sediment in the condensation chamber and a pipeline is cleaned by feeding a cleaning agent through the dosing box and a brushing device, a large amount of waste residues accumulated in the evaporation chamber are cleaned through a rotatable brush, and the cleaning effect is good; and through the scrubbing device and the waste residue recovery device, the scrapers at the bottoms of the brushes can scrape cleaned waste residues into the residue accumulation box, and the scrapers can be taken down at any time to be cleaned, so that convenience and rapidness are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of double-effect external circulation evaporator preheaters, in particular to an internal cleaning device of a double-effect external circulation evaporator preheater. Background Art

[0002] In the industries of Chinese and Western medicine, light chemical industry and food processing, evaporators are usually used to evaporate and concentrate solutions. In order to improve the energy-saving effect of the evaporator, double-effect or triple-effect external circulation evaporators are currently used. Double-effect means that the high-temperature steam that has not been completely condensed into liquid is reintroduced into the steam chamber as a heating source. This method can greatly save energy and make full use of heat. During the use of the evaporator, sediment will gradually accumulate on the wall and pipes. If it is not cleaned in time, it will cause blockage.

[0003] For example, a double-effect external circulation evaporator with Chinese patent publication number: CN212700589U includes a distillation tank, a steam pipe and a condensation tank are arranged on the top of the distillation tank, the bottom of the steam pipe is connected to the interior of the distillation tank, the top of the steam pipe passes through the condensation tank, an opening is arranged on the top of the condensation tank, a cover plate is arranged on the opening, an external circulation pipe is arranged on the cover plate, one end of the external circulation pipe is connected to the interior of the condensation tank, and the other end of the external circulation pipe is connected to the side wall of the distillation tank, a sleeve is arranged on the outside of the distillation tank, a vacuum chamber is formed between the sleeve and the distillation tank, and a vacuum pump is arranged on the outside of the sleeve.

[0004] In order to solve the problem of easy heat loss, the existing technology uses a vacuum pump to draw a vacuum, but there are still problems such as strict requirements on airtightness of the vacuum device, a large amount of waste residue is easy to accumulate in the evaporation chamber during the use of the evaporator, and sediment is easy to accumulate in the condensation chamber and the pipeline during the use of the evaporator, which makes it difficult to disassemble the device and inconvenient to clean the inside, the waste residue in the evaporation chamber needs to be disassembled and cleaned regularly, and the complex internal structure of the condensation chamber and the pipeline makes it difficult to clean the sediment. Utility Model Content

[0005] The utility model aims to provide a double-effect external circulation evaporator preheater internal cleaning device to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A double-effect external circulation evaporation preheater internal cleaning device, comprising an evaporation device, the evaporation device comprising an evaporation box, a feed pipe, an electric heating box and an electric heating plate, a condensation device is fixedly installed on the top of the evaporation box, a double-effect external circulation device is fixedly installed on the top of the condensation device, an opening and closing device is fixedly installed on the bottom of the evaporation box, a scrubbing device is arranged at the bottom of the opening and closing device, and a waste residue recovery device is fixedly installed on the bottom of the opening and closing device;

[0008] The opening and closing device comprises an opening and closing box, an opening and closing box bottom cover and an opening and closing door, and the opening and closing box is fixedly installed at the bottom of the evaporation box;

[0009] The scrubbing device comprises a motor, a coupling, a rotating shaft, a hydraulic telescopic shaft 1, a brush holder, a hydraulic telescopic shaft 2 and a brush, wherein the motor is arranged at the very bottom of the opening and closing door;

[0010] The waste residue recovery device comprises a splash-proof shell and a telescopic residue accumulation box, and the splash-proof shell is fixedly installed at the bottom of the opening and closing door.

[0011] A further improvement of the technical solution of the utility model is that: the feed pipe is embedded and installed on the outer surface of the evaporation box, the electric heating box is embedded and installed at the bottom of the inner cavity of the evaporation box, a through brushing hole is opened on the top of the electric heating box, and the electric heating plate is fixedly installed in the inner cavity of the electric heating box at equal intervals around the axis;

[0012] By adopting the above technical solution, the raw materials in the evaporation box are heated by the high-temperature steam returning from the external circulation pipeline and the electric heating plate.

[0013] A further improvement of the technical solution of the utility model is that: the condensing device includes a condensing outer box, a condensing inner box, a condensing pipe, an air guide pipe and a discharge pipe, the condensing outer box is fixedly installed on the top of the evaporating box, the condensing inner box is fixedly installed on the bottom of the inner cavity of the condensing outer box, the bottoms of the condensing outer box and the condensing inner box are provided with through air guide holes, the condensing pipe is arranged just above the condensing inner box, the two ends of the condensing pipe pass through the inner wall of the condensing outer box, the air guide pipe is embedded in the air guide holes of the condensing outer box and the condensing inner box, and the discharge pipe passes through the outer surface of the condensing outer box and is embedded in the outer surface of the condensing inner box;

[0014] By adopting the above technical solution, the steam is condensed through the condenser, the liquefied product falls into the condensation inner box, and is discharged through the discharge pipe.

[0015] A further improvement of the technical solution of the utility model is that: the double-effect external circulation device includes an upper cover, an external circulation pipeline, a medicine box and a medicine box door, the upper cover is fixedly installed on the top of the condensing outer box, a through external circulation hole is opened at the top axis of the upper cover, one end of the external circulation pipeline is embedded in the external circulation hole, the other end of the external circulation pipeline penetrates the outer surface of the evaporation box and extends into the inner cavity of the evaporation box, a through medicine hole is opened on the outer surface of the external circulation pipeline, a tubular structure is provided at the bottom of the medicine box, the tubular structure of the medicine box is embedded in the medicine hole of the external circulation pipeline, and the medicine box door is installed on the top of the medicine box by a hinge;

[0016] By adopting the above technical solution, cleaning medicine is added into the medicine box, so that the medicine passes through the external circulation pipeline, the condensing device and the evaporating device from top to bottom, and the cleaning effect is good.

[0017] A further improvement of the technical solution of the utility model is that: the tops of the opening and closing box and the bottom cover of the opening and closing box are provided with through closing holes, the top of the inner cavity of the opening and closing box is provided with positioning columns at equal intervals around the axis, the bottom cover of the opening and closing box is embedded and installed in the bottom of the inner cavity of the opening and closing box, the top of the bottom cover of the opening and closing box is provided with sliding grooves at equal intervals around the axis, the number of the opening and closing doors is multiple groups, the opening and closing doors are arranged in the inner cavity of the opening and closing box, the positioning columns of the opening and closing box are embedded and installed at one end of the upper surface of the opening and closing doors, the lower surface of the other end of the opening and closing doors is provided with a sliding shaft, the outer surface of the sliding shaft cooperates with the groove wall of the sliding groove of the bottom cover of the opening and closing box, and the outer surfaces of the multiple groups of the opening and closing doors cooperate with each other;

[0018] By adopting the above technical solution, the opening and closing doors are made of soft metal material, and multiple groups of opening and closing doors cooperate with each other to realize the opening and closing of the closing hole. The gap between the opening and closing box and the bottom cover of the opening and closing box is filled with rubber material to prevent leakage of raw materials.

[0019] The further improvement of the technical solution of the utility model is that: the bottom of the coupling is detachably fixedly connected to the output end of the motor, the bottom of the rotating shaft is fixedly connected to the bottom of the coupling, the hydraulic telescopic shaft 1 is embedded and installed on the top of the rotating shaft, the brush holder is fixedly installed on the top of the hydraulic telescopic shaft 1, the outer surface of the hydraulic telescopic shaft 1 is provided with a telescopic shaft seat structure at equal intervals around the axis, one end of the hydraulic telescopic shaft 2 is embedded and installed on the end surface of the telescopic shaft seat mechanism, and the brush is fixedly installed on the other end of the hydraulic telescopic shaft 2;

[0020] By adopting the above technical solution, a scraper structure is arranged at the bottom of the brush, so that the waste residue brushed off can be scraped into the waste residue recovery device.

[0021] A further improvement of the technical solution of the utility model is that: a through brushing hole is opened at the bottom axis of the splash-proof shell and the telescopic slag accumulation box, the splash-proof shell and the telescopic slag accumulation box are sleeved on the outer surface of the brushing device, the bottom of the splash-proof shell is provided with telescopic grooves at equal intervals around the brushing hole, the top of the telescopic slag accumulation box is provided with a telescopic plate structure at equal intervals around the axis, and the telescopic plate of the telescopic slag accumulation box is embedded and installed in the telescopic groove of the splash-proof shell;

[0022] By adopting the above technical solution, the splash-proof shell can prevent the waste residue from splashing around under the action of the brush, and the telescopic residue box can move freely up and down, so as to facilitate the cleaning and recycling of the collected waste residue.

[0023] Due to the adoption of the above technical solution, the utility model has achieved the following technical progress compared with the prior art:

[0024] 1. The utility model provides an internal cleaning device for a double-effect external circulation evaporator preheater. Through an opening and closing device and a brushing device, the internal cleaning can be completed without disassembling the device, saving time and effort.

[0025] 2. The utility model provides an internal cleaning device for a double-effect external circulation evaporator preheater. Through a dosing box and a scrubbing device, a cleaning agent is put into the dosing box to clean a small amount of sediment in the condensation chamber and the pipeline, and a rotatable brush is used to clean a large amount of waste residue accumulated in the evaporation chamber, and the cleaning effect is good.

[0026] 3. The utility model provides an internal cleaning device for a double-effect external circulation evaporator preheater. Through a scrubbing device and a waste residue recovery device, the scraper at the bottom of the brush can scrape the cleaned waste residue into a residue accumulation box, and can be removed for cleaning at any time, which is convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the utility model;

[0028] Figure 2 It is a cross-sectional view of the utility model;

[0029] Figure 3 It is a cross-sectional view of the utility model during cleaning;

[0030] Figure 4 This is a schematic diagram of the structure of the scrubbing device of the utility model;

[0031] Figure 5 This is an exploded view of the opening and closing device of the utility model.

[0032] In the figure: 1. Evaporation device; 2. Condensation device; 3. Double-effect external circulation device; 4. Opening and closing device; 5. Scrubbing device; 6. Waste residue recovery device; 11. Evaporation box; 12. Feed pipe; 13. Electric heating box; 14. Electric heating plate; 21. Condensation outer box; 22. Condensation inner box; 23. Condensation pipe; 24. Air guide pipe; 25. Discharge pipe; 31. Upper cover; 32. External circulation pipeline; 33. Dosing box; 34. Dosing box door; 41. Opening and closing box; 42. Opening and closing box bottom cover; 43. Opening and closing fan door; 51. Motor; 52. Coupling; 53. Rotating shaft; 54. Hydraulic telescopic shaft one; 55. Brush holder; 56. Hydraulic telescopic shaft two; 57. Brush; 61. Splashproof shell; 62. Telescopic residue box. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the embodiments:

[0034] Example 1

[0035] like Figure 1-5 As shown, the utility model provides an internal cleaning device for a double-effect external circulation evaporation preheater, comprising an evaporation device 1, the evaporation device 1 comprising an evaporation box 11, a feed pipe 12, an electric heating box 13 and an electric heating plate 14, the feed pipe 12 is embedded and installed on the outer surface of the evaporation box 11, the electric heating box 13 is embedded and installed on the bottom of the inner cavity of the evaporation box 11, the top of the electric heating box 13 is provided with a through brushing hole, the electric heating plate 14 is fixedly installed in the inner cavity of the electric heating box 13 at equal intervals around the axis, and the raw materials in the evaporation box 11 are heated by the high-temperature steam refluxed from the external circulation pipe 32 and the electric heating plate 14;

[0036] A condensing device 2 is fixedly installed on the top of the evaporation box 11. The condensing device 2 includes a condensing outer box 21, a condensing inner box 22, a condensing pipe 23, an air guide pipe 24 and a discharge pipe 25. The condensing outer box 21 is fixedly installed on the top of the evaporation box 11, and the condensing inner box 22 is fixedly installed at the bottom of the inner cavity of the condensing outer box 21. Through air guide holes are opened at the bottom of the condensing outer box 21 and the condensing inner box 22. The condensing pipe 23 is arranged just above the condensing inner box 22. Both ends of the condensing pipe 23 pass through the inner wall of the condensing outer box 21. The air guide pipe 24 is embedded in the air guide holes of the condensing outer box 21 and the condensing inner box 22. The discharge pipe 25 passes through the outer surface of the condensing outer box 21 and is embedded in the outer surface of the condensing inner box 22. The steam is condensed by the condensing pipe 23, and the liquefied product falls into the condensing inner box 22 and is discharged through the discharge pipe 25.

[0037] A double-effect external circulation device 3 is fixedly installed on the top of the condensing device 2. The double-effect external circulation device 3 includes an upper cover 31, an external circulation pipe 32, a medicine box 33 and a medicine box door 34. The upper cover 31 is fixedly installed on the top of the condensing outer box 21. A through external circulation hole is opened at the top axis of the upper cover 31. One end of the external circulation pipe 32 is embedded in the external circulation hole. The other end of the external circulation pipe 32 penetrates the outer surface of the evaporation box 11 and extends into the inner cavity of the evaporation box 11. A through medicine hole is opened on the outer surface of the external circulation pipe 32. A tubular structure is provided at the bottom of the medicine box 33. The tubular structure of the medicine box 33 is embedded in the medicine hole of the external circulation pipe 32. The medicine box door 34 is hingedly installed on the top of the medicine box 33. By adding cleaning medicine into the medicine box 33, the medicine passes through the external circulation pipe 32, the condensing device 2 and the evaporation device 1 from top to bottom, and the cleaning effect is good.

[0038] Example 2

[0039] like Figure 1-5 As shown, on the basis of Example 1, the utility model provides a technical solution: preferably, an opening and closing device 4 is fixedly installed at the bottom of the evaporation box 11, and the opening and closing device 4 includes an opening and closing box 41, an opening and closing box bottom cover 42 and an opening and closing door 43. The opening and closing box 41 is fixedly installed at the bottom of the evaporation box 11, and a through closing hole is opened on the top of the opening and closing box 41 and the opening and closing box bottom cover 42. Positioning columns are arranged at equal intervals on the top of the inner cavity of the opening and closing box 41 around the axis, and the opening and closing box bottom cover 42 is embedded and installed on the bottom of the inner cavity of the opening and closing box 41. Sliding The plurality of opening and closing doors 43 are provided in the inner cavity of the opening and closing box 41, the positioning column of the opening and closing box 41 is embedded in one end of the upper surface of the opening and closing door 43, and a sliding shaft is provided on the lower surface of the other end of the opening and closing door 43, and the outer surface of the sliding shaft cooperates with the groove wall of the sliding groove of the opening and closing box bottom cover 42, and the outer surfaces of the plurality of opening and closing doors 43 cooperate with each other. The opening and closing doors 43 are made of soft metal material, and the plurality of opening and closing doors 43 cooperate with each other to realize the opening and closing of the closed hole, and the gap between the opening and closing box 41 and the opening and closing box bottom cover 42 is filled with rubber material to prevent leakage of raw materials.

[0040] Example 3

[0041] like Figure 1-5As shown, on the basis of Embodiment 1-2, the utility model provides a technical solution: preferably, a brushing device 5 is provided at the bottom of the opening and closing device 4, and the brushing device 5 includes a motor 51, a coupling 52, a rotating shaft 53, a hydraulic telescopic shaft 1 54, a brush holder 55, a hydraulic telescopic shaft 2 56 and a brush 57. The motor 51 is arranged at the very bottom of the opening and closing door 43, the bottom of the coupling 52 is detachably fixedly connected to the output end of the motor 51, the bottom of the rotating shaft 53 is fixedly connected to the bottom of the coupling 52, the hydraulic telescopic shaft 1 54 is embedded and installed on the top of the rotating shaft 53, the brush holder 55 is fixedly installed on the top of the hydraulic telescopic shaft 1 54, and the outer surface of the hydraulic telescopic shaft 1 54 is provided with a telescopic shaft seat structure at equal intervals around the axis, one end of the hydraulic telescopic shaft 2 56 is embedded and installed on the end surface of the telescopic shaft seat mechanism, and the brush 57 is fixedly installed on the other end of the hydraulic telescopic shaft 2 56, and a scraper structure is provided at the bottom of the brush 57, which can scrape the waste residue brushed off into the waste residue recovery device 6;

[0042] A waste residue recovery device 6 is fixedly installed at the bottom of the opening and closing device 4, and the waste residue recovery device 6 includes a splash-proof shell 61 and a telescopic residue box 62. The splash-proof shell 61 is fixedly installed at the bottom of the opening and closing door 43, and a through brushing hole is opened at the bottom axis of the splash-proof shell 61 and the telescopic residue box 62. The splash-proof shell 61 and the telescopic residue box 62 are sleeved on the outer surface of the brushing device 5, and telescopic grooves are opened at equal intervals around the brushing hole at the bottom of the splash-proof shell 61, and a telescopic plate structure is arranged at equal intervals around the axis at the top of the telescopic residue box 62, and the telescopic plate of the telescopic residue box 62 is embedded in the telescopic groove of the splash-proof shell 61. The splash-proof shell 61 can prevent waste residue from splashing around under the action of the brush 57, and the telescopic residue box 62 can move freely up and down, which is convenient for cleaning and recycling the collected waste residue.

[0043] The working principle of the internal cleaning device of the double-effect external circulation evaporator preheater is described in detail below.

[0044] like Figure 1-5As shown, the raw material is introduced into the evaporation box 11 from the feed pipe 12, and the electric heating plate 14 heats the raw material to evaporate it. After the steam enters the condensation outer box 21 through the air guide pipe 24, it is liquefied under the action of the condensation pipe 23, drips into the condensation inner box 22, and is discharged through the discharge pipe 25. The unliquefied high-temperature steam returns to the evaporation box 11 through the external circulation pipe 32 to participate in the heating of the raw material; when it is necessary to clean the inside of the device, a cleaning agent is added through the drug box 33, and the agent passes through the external circulation pipe 32, the condensation device 2 and the evaporation device 1 from top to bottom, and the bottom of the box is opened and closed. The cover 42 rotates, driving the opening and closing door 43 to rotate, exposing the closed hole, and the hydraulic telescopic shaft 1 54 extends out, driving the brush holder 55 to pass through the closed hole into the inner cavity of the evaporator box 11, and the hydraulic telescopic shaft 2 56 extends out, driving the brush 57 to contact the inner wall of the evaporator box 11, and the motor 51 is started. The motor 51 drives the rotating shaft 53 to rotate, and the rotating shaft 53 drives the brush holder 55 to rotate. The brush holder 55 drives the brush 57 to scrub the inner wall of the evaporator box 11, and the scraper at the bottom of the brush 57 scrapes the waste residue brushed off into the closed hole and enters the telescopic residue box through the splashproof shell 61.

[0045] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not deviate from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A double-effect external circulation evaporation preheater internal cleaning device, comprising an evaporation device (1), wherein the evaporation device (1) comprises an evaporation box (11), a feed pipe (12), an electric heating box (13) and an electric heating plate (14), a condensation device (2) is fixedly installed on the top of the evaporation box (11), and a double-effect external circulation device (3) is fixedly installed on the top of the condensation device (2), characterized in that: An opening and closing device (4) is fixedly installed at the bottom of the evaporation box (11), a scrubbing device (5) is provided at the bottom of the opening and closing device (4), and a waste residue recovery device (6) is fixedly installed at the bottom of the opening and closing device (4); The opening and closing device (4) comprises an opening and closing box (41), an opening and closing box bottom cover (42) and an opening and closing door (43); the opening and closing box (41) is fixedly mounted on the bottom of the evaporation box (11); The scrubbing device (5) comprises a motor (51), a coupling (52), a rotating shaft (53), a hydraulic telescopic shaft 1 (54), a brush holder (55), a hydraulic telescopic shaft 2 (56) and a brush (57), wherein the motor (51) is arranged at the bottom of the opening and closing door (43); The waste residue recovery device (6) comprises a splash-proof shell (61) and a telescopic residue storage box (62), and the splash-proof shell (61) is fixedly mounted on the bottom of the opening and closing door (43).

2. The internal cleaning device of a double-effect external circulation evaporator preheater according to claim 1 is characterized in that: The feed pipe (12) is embedded and installed on the outer surface of the evaporation box (11), the electric heating box (13) is embedded and installed on the bottom of the inner cavity of the evaporation box (11), the top of the electric heating box (13) is provided with a through brushing hole, and the electric heating plate (14) is fixedly installed in the inner cavity of the electric heating box (13) at equal intervals around the axis.

3. The internal cleaning device of a double-effect external circulation evaporator preheater according to claim 1 is characterized in that: The condensing device (2) comprises a condensing outer box (21), a condensing inner box (22), a condensing pipe (23), an air guide pipe (24) and a discharge pipe (25); the condensing outer box (21) is fixedly mounted on the top of the evaporating box (11); the condensing inner box (22) is fixedly mounted on the bottom of the inner cavity of the condensing outer box (21); the bottoms of the condensing outer box (21) and the condensing inner box (22) are provided with through air guide holes; the condensing pipe (23) is arranged directly above the condensing inner box (22); both ends of the condensing pipe (23) pass through the inner wall of the condensing outer box (21); the air guide pipe (24) is embedded in the air guide holes of the condensing outer box (21) and the condensing inner box (22); and the discharge pipe (25) passes through the outer surface of the condensing outer box (21) and is embedded in the outer surface of the condensing inner box (22).

4. The internal cleaning device of a double-effect external circulation evaporator preheater according to claim 3 is characterized in that: The double-effect external circulation device (3) comprises an upper cover (31), an external circulation pipe (32), a medicine box (33) and a medicine box door (34); the upper cover (31) is fixedly installed on the top of the condensing outer box (21); a through external circulation hole is opened at the top axis of the upper cover (31); one end of the external circulation pipe (32) is embedded in the external circulation hole; the other end of the external circulation pipe (32) passes through the outer surface of the evaporation box (11) and extends into the inner cavity of the evaporation box (11); a through medicine hole is opened on the outer surface of the external circulation pipe (32); a tubular structure is provided at the bottom of the medicine box (33); the tubular structure of the medicine box (33) is embedded in the medicine hole of the external circulation pipe (32); and the medicine box door (34) is installed on the top of the medicine box (33) by a hinge.

5. The internal cleaning device of a double-effect external circulation evaporator preheater according to claim 1 is characterized in that: The tops of the opening and closing box (41) and the bottom cover (42) of the opening and closing box are provided with through closing holes, the top of the inner cavity of the opening and closing box (41) is provided with positioning columns at equal intervals around the axis, the bottom cover (42) of the opening and closing box is embedded in the bottom of the inner cavity of the opening and closing box (41), and the top of the bottom cover (42) of the opening and closing box is provided with sliding grooves at equal intervals around the axis, the number of the opening and closing doors (43) is multiple groups, the opening and closing doors (43) are arranged in the inner cavity of the opening and closing box (41), the positioning columns of the opening and closing box (41) are embedded in one end of the upper surface of the opening and closing door (43), and the lower surface of the other end of the opening and closing door (43) is provided with a sliding shaft, the outer surface of the sliding shaft cooperates with the groove wall of the sliding groove of the bottom cover (42) of the opening and closing box, and the outer surfaces of the multiple groups of the opening and closing doors (43) cooperate with each other.

6. The internal cleaning device of a double-effect external circulation evaporator preheater according to claim 1 is characterized in that: The bottom of the coupling (52) is detachably fixedly connected to the output end of the motor (51), the bottom of the rotating shaft (53) is fixedly connected to the bottom of the coupling (52), the hydraulic telescopic shaft (54) is embedded and installed on the top of the rotating shaft (53), the brush holder (55) is fixedly installed on the top of the hydraulic telescopic shaft (54), the outer surface of the hydraulic telescopic shaft (54) is provided with a telescopic shaft seat structure at equal intervals around the axis, one end of the hydraulic telescopic shaft (56) is embedded and installed on the end surface of the telescopic shaft seat mechanism, and the brush (57) is fixedly installed on the other end of the hydraulic telescopic shaft (56).

7. The internal cleaning device of a double-effect external circulation evaporator preheater according to claim 6, characterized in that: The splash-proof shell (61) and the telescopic slag box (62) are provided with a through brushing hole at the bottom axis; the splash-proof shell (61) and the telescopic slag box (62) are sleeved on the outer surface of the brushing device (5); the bottom of the splash-proof shell (61) is provided with telescopic grooves at equal intervals around the brushing hole; the top of the telescopic slag box (62) is provided with a telescopic plate structure at equal intervals around the axis; the telescopic plate of the telescopic slag box (62) is embedded and installed in the telescopic groove of the splash-proof shell (61).

Images