Scraper mounting structure of film evaporator

Abstract

The utility model relates to a scraper mounting structure of a film evaporator, and belongs to the technical field of film evaporators for acetic acid recovery. The device comprises a main shaft, a scraper support, a scraper and a barrel, the main shaft is rotatably mounted in the center of the barrel through a driving mechanism and a supporting mechanism, the axis of the main shaft is vertically arranged, the scraper is mounted on the main shaft through the scraper support, one end of the scraper close to the scraper support is a scraper connecting end, and one end of the scraper far away from the scraper support is a scraper working end. The scraper connecting end is rotationally connected with the scraper support through a vertical rotating shaft, and when the main shaft is driven by the driving mechanism to rotate, a preset distance is formed between the scraper working end and the inner wall of the barrel in the diameter direction of the barrel. Heavy components generated in the working process of the equipment are attached to the inner surface of the cylinder body, and in the process of crushing such substances, due to the fact that a movable scraper structure (the connecting end of the scraper can rotate around a vertical rotating shaft) is adopted, counter-acting force can be remarkably reduced, and the scraper is not prone to deformation and abrasion.

Description

Technical Field

[0001] This utility model relates to a scraper mounting structure for a thin-film evaporator, belonging to the technical field of thin-film evaporators for acetic acid recovery. Background Technology

[0002] Thin-film evaporators are commonly used in chemical production plants for separating and purifying mixed liquids. The main structure of a thin-film evaporator can be found in the applicant's prior patent application (publication number CN207055996U), which includes a heating shell (i.e., a cylinder), a vertically arranged stirring shaft (i.e., a main shaft) inside the heating shell, stirring blades (i.e., scrapers) fitted on the outer wall of the stirring shaft, a jacket outside the heating shell with a steam inlet and a steam condensate outlet, a feed inlet and a material recovery outlet on the side wall of the heating shell, and a liquid distribution plate fitted on the outer wall of the stirring shaft, positioned corresponding to the feed inlet. During operation, the raw liquid to be processed enters the cylinder from the upper part of the device. Under the action of the liquid distribution plate and scrapers, the raw liquid is evenly distributed along the inner wall of the cylinder to form a thin film, which is then evaporated and concentrated under the action of the heating jacket. The lighter components formed during heating are discharged from the top of the thin-film evaporator, while the heavier components are discharged from the bottom of the device after drying.

[0003] In existing technologies, scrapers are mostly fixed straight plates, with one side fixedly connected to a scraper bracket on the main shaft and the other side close to the inner surface of the cylinder wall. Driven by the high-speed rotation of the main shaft, the scraper achieves the coating of the raw liquid and the separation of heavy components from the cylinder wall. Heavy components generated during equipment operation usually adhere to the inner surface of the cylinder. During the crushing of these substances, because the scraper, scraper bracket, and main shaft are rigidly connected, the scraper experiences a large reaction force, making it prone to deformation and wear. This results in uneven coating thickness, low heat treatment capacity, and ultimately reduced equipment capacity and product yield. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a scraper mounting structure for a thin film evaporator, which makes the scraper less prone to deformation and wear during the operation of the equipment.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a thin-film evaporator scraper mounting structure, including a main shaft, a scraper bracket, a scraper, and a cylinder. The main shaft is rotatably mounted at the center of the cylinder through a drive mechanism and a support mechanism. The axis of the main shaft is vertically arranged. The scraper is mounted on the main shaft through the scraper bracket. The end of the scraper near the scraper bracket is the scraper connecting end, and the end of the scraper away from the scraper bracket is the scraper working end. The scraper connecting end and the scraper bracket are rotatably connected through a vertical rotating shaft. When the main shaft rotates under the drive of the drive mechanism, there is a preset distance between the scraper working end and the inner wall of the cylinder in the direction of the cylinder diameter.

[0006] To effectively ensure the coating effect, the preferred solution is to set multiple sets of scrapers at even intervals along the axial direction of the main shaft, and to set multiple scrapers at even intervals along the outer periphery of the main shaft in each set.

[0007] To facilitate assembly and positioning and improve structural reliability, the preferred solution is as follows: a connecting sleeve is fixedly installed at the upper and lower ends of the scraper connecting end, and each connecting sleeve is provided with a vertical rotating shaft. The vertical rotating shaft includes a threaded fixing section and a cylindrical pin section arranged coaxially. The threaded fixing section is connected and fixed to the threaded hole on the scraper bracket, and the cylindrical pin section is inserted into the connecting sleeve with clearance fit.

[0008] To further facilitate assembly and positioning, the preferred solution is that the end of the threaded fixing section of the vertical rotating shaft away from the cylindrical pin section is coaxially fixedly connected to an external hexagonal screw head.

[0009] To effectively ensure the coating effect, the preferred solution is: the scraper includes a scraper body, which is a strip plate extending vertically. The cross-section of the scraper body includes a first straight segment and a second straight segment arranged in an L shape, and the connection between the first straight segment and the second straight segment is provided with a rounded corner structure. The scraper body has a beveled surface at the end face corresponding to the working end of the scraper to form a scraper cutting edge structure.

[0010] To facilitate processing and improve structural reliability, the preferred solution is to weld the scraper bracket to the spindle.

[0011] The beneficial effects of this invention are as follows: the scraper connecting end can rotate around a vertical axis relative to the scraper support. When the equipment is put into operation, the high-speed rotation of the main shaft generates centrifugal force. Under the action of centrifugal force, the scraper expands to its working size, and the working end of the scraper uniformly coats the mixed liquid, allowing the thin-film evaporator to perform separation and purification. Heavy components generated during equipment operation adhere to the inner surface of the cylinder. During the crushing of these substances, the use of a movable scraper structure (the scraper connecting end can rotate around a vertical axis) significantly reduces reaction force and equipment vibration. Furthermore, the scraper is less prone to deformation and wear, thus effectively improving its service life. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the main structure of the thin-film evaporator described in this utility model.

[0013] Figure 2 This is a schematic diagram of the installation structure of the scraper bracket, scraper, spindle and other components of this utility model in the top view of the equipment.

[0014] Figure 3 This is a schematic diagram of the installation structure of the scraper bracket, scraper, and other components of this utility model in the front view of the equipment.

[0015] Figure 4 This is the front view of the scraper of this utility model.

[0016] Figure 5 This is a top view of the scraper of this utility model.

[0017] Figure 6 This is the front view of the vertical rotating shaft of this utility model.

[0018] The components in the diagram are labeled as follows: spindle 1, scraper bracket 2, scraper 3, scraper connecting end 31, scraper working end 32, connecting sleeve 33, scraper cutting edge structure 34, vertical rotating shaft 4, threaded fixing section 41, cylindrical pin section 42, external hexagonal screw head 43, and cylinder 5. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] like Figures 1 to 6 As shown, this utility model includes a main shaft 1, a scraper bracket 2, a scraper 3, and a cylinder 5. The main shaft 1 is rotatably mounted at the center of the cylinder 5 through a drive mechanism and a support mechanism. The axis of the main shaft 1 is vertically oriented. The scraper 3 is mounted on the main shaft 1 through the scraper bracket 2. The end of the scraper 3 near the scraper bracket 2 is the scraper connecting end 31, and the end of the scraper 3 away from the scraper bracket 2 is the scraper working end 32. The scraper connecting end 31 and the scraper bracket 2 are rotatably connected through a vertical rotating shaft 4. When the main shaft 1 rotates under the drive of the drive mechanism, there is a preset distance between the scraper working end 32 and the inner wall of the cylinder 5 in the diameter direction of the cylinder 5. This preset distance can be reasonably designed according to the coating thickness requirements when the equipment is working. Usually, the diameter of the largest cylindrical surface formed when the scraper working end 32 rotates is 0.10mm to 0.15mm smaller than the inner diameter of the cylinder 5. The scraper connection end 31 can rotate around the vertical axis 4 relative to the scraper support 2. When the equipment is put into use, the main shaft 1 rotates at high speed to generate centrifugal force. Under the action of centrifugal force, the scraper 3 expands to the working size. The scraper working end 32 uniformly coats the mixed liquid, and the thin film evaporator performs separation and purification work.

[0021] It is understood that the key technical point of this utility model lies in the specific installation structure of the scraper 3. For the parts of the main structure of the thin film evaporator that are not described in detail, please refer to the existing technology implementation, such as the applicant's prior patent application (patent document with publication number CN207055996U).

[0022] To effectively ensure the coating effect, the preferred arrangement of the scrapers 3 is to have multiple sets evenly spaced along the axial direction of the main shaft 1, with multiple scrapers 3 evenly spaced along the outer periphery of the main shaft 1 in each set. It is understood that the specific structure of the scraper support 2 should match the installation method of the scrapers 3, and the scraper support 2 should be arranged in a multi-layer structure accordingly. To facilitate processing and improve structural reliability, the scraper support 2 and the main shaft 1 are preferably fixed by welding. In some alternative embodiments, the scraper support 2 and the main shaft 1 can also be fixed by bolts, as long as the fixation is secure.

[0023] To facilitate assembly and positioning and improve structural reliability, connecting sleeves 33 are fixedly installed at the upper and lower ends of the scraper connecting end 31. Each connecting sleeve 33 corresponds to a vertical rotating shaft 4, which includes a threaded fixing section 41 and a cylindrical pin section 42 arranged coaxially. The threaded fixing section 41 is connected and fixed to the threaded hole on the scraper bracket 2. The cylindrical pin section 42 is inserted into the connecting sleeve 33 with a clearance fit. The specific clearance fit can be reasonably selected according to the actual situation. Typically, the inner diameter of the connecting sleeve 33 is 0.10mm to 0.15mm larger than the outer diameter of the cylindrical pin section 42. The connecting sleeve 33 and the scraper body can be an integral structure or fixed into a whole by welding.

[0024] To further facilitate assembly and positioning, an external hexagonal screw head 43 is coaxially fixedly connected to one end of the threaded fixing section 41 of the vertical rotating shaft 4 away from the cylindrical pin section 42. The external hexagonal screw head 43 is used to screw the vertical rotating shaft 4.

[0025] To effectively ensure the coating effect, the scraper 3 includes a scraper body, which is a strip plate extending vertically. The cross-section of the scraper body includes a first straight segment and a second straight segment arranged in an L shape, and the connection between the first straight segment and the second straight segment is provided with a rounded corner structure. The scraper body has a beveled surface at the end face corresponding to the working end 32 of the scraper to form a scraper cutting edge structure 34. That is, it is equivalent to the centrifugal force generated by the high-speed rotation of the spindle 1. The scraper 3 expands under the action of centrifugal force. The diameter of the cylindrical surface where the scraper cutting edge structure 34 is located is the working dimension of the scraper 3.

[0026] The specific parameters (material, strength, and fit dimensions) for implementing this utility model will be determined based on the actual application.

Claims

1. A thin film evaporator doctor blade mounting structure, comprising a main shaft (1), a doctor blade support (2), a doctor blade (3) and a cylinder (5), the main shaft (1) is rotatably mounted at the center of the cylinder (5) by a driving mechanism and a supporting mechanism, the axis of the main shaft (1) is vertically arranged, the doctor blade (3) is mounted on the main shaft (1) by the doctor blade support (2), one end of the doctor blade (3) close to the doctor blade support (2) is a doctor blade connecting end (31), and the other end of the doctor blade (3) away from the doctor blade support (2) is a doctor blade working end (32), characterized in that: The scraper connecting end (31) is rotationally connected with the scraper support (2) through a vertical rotating shaft (4), when the main shaft (1) is rotated under the driving of the driving mechanism, the scraper working end (32) and the inner wall of the cylinder (5) have a preset interval in the diameter direction of the cylinder (5). ​ 2. The thin film evaporator doctor blade mounting structure of claim 1, wherein: The scrapers (3) are uniformly and spacedly arranged along the axial direction of the main shaft (1), and each group of scrapers (3) is uniformly and spacedly arranged along the peripheral direction of the main shaft (1).

3. The thin film evaporator doctor blade mounting structure of claim 1, wherein: The upper end and the lower end of the scraper connecting end (31) are respectively fixedly provided with a connecting sleeve (33), each connecting sleeve (33) is correspondingly provided with a vertical rotating shaft (4), the vertical rotating shaft (4) comprises a threaded fixing section (41) and a cylindrical bolt section (42) which are coaxially arranged, the threaded fixing section (41) is connected and fixed with the threaded hole on the scraper support (2), and the cylindrical bolt section (42) is inserted into the connecting sleeve (33) in clearance fit.

4. The thin film evaporator doctor blade mounting structure of claim 3, wherein: The threaded fixing section (41) of the vertical rotating shaft (4) is coaxially fixedly connected with an outer hexagonal screw head (43) at one end away from the cylindrical bolt section (42).

5. The thin film evaporator doctor blade mounting structure of claim 1 wherein: The scraper (3) comprises a scraper main body, the scraper main body is a strip-shaped plate extending in the vertical direction, the cross section of the scraper main body comprises a first straight section and a second straight section arranged in an L shape, the connecting part of the first straight section and the second straight section is provided with a rounded corner structure, and the scraper main body is provided with an inclined surface at the end face position corresponding to the scraper working end (32) to form a scraper edge structure (34).

6. The thin film evaporator doctor blade mounting structure of any one of claims 1 to 5, wherein: The scraper support (2) is welded and fixed with the main shaft (1).

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