An adaptive scraper and scraper evaporator

Abstract

This invention relates to an adaptive scraper for an evaporator and a scraper evaporator. The adaptive scraper includes a scraper holder and scraper blades. The scraper holder includes a shaft seat and at least one blade support mounted on the shaft seat. Each blade support has at least one segment of scraper blades, and each segment of scraper blades has at least two identical elongated holes. The scraper blades are mounted on the blade supports by a fastening assembly. After the fastening assembly and the blade supports are fixed, the gap between them is greater than the thickness of the scraper blades to allow the scraper blades to adaptively displace in their thickness direction and adaptively displace through the elongated holes in their length or width direction. This invention achieves adaptive adjustment of the scraper in its width and height directions and provides a clean cleaning effect without blind spots.

Description

Technical Field

[0001] This invention relates to the field of evaporation and concentration, and more specifically to an evaporator with an adaptive scraper and a scraper evaporator. Background Technology

[0002] CN121222096A discloses a complex solution evaporator, which is a horizontal scraped evaporator. It is mainly used for deep volume reduction and concentration of complex solutions with high viscosity, high salt content, high COD, easy foaming, and easy scaling in the chemical, environmental protection, and pharmaceutical fields. Its working principle involves a drive shaft that rotates a scraper between several vertically and equidistantly installed heat exchange plates submerged in the feed liquid. The scraper enhances heat transfer between the heat exchange plates and the feed liquid and promotes scale-free operation of the heat exchange plates. Existing technologies all use a rigid, integral scraper structure. Engineering practice shows that, due to factors such as evaporator installation errors and uneven scale thickness on the heat exchange plates, the scraper sidewall is prone to rubbing against the heat exchange plates, leading to damage and leakage. Furthermore, the rigid scraper structure cannot adapt to dynamic changes in the scale layer thickness on the heat exchange plates, resulting in cleaning blind spots. Residual scale reduces the heat transfer performance of the evaporator. The evaporator scraper structures disclosed in existing technologies such as CN118681241A, CN120478992A, CN119660862A, and CN105879419A, with their different structures, are mainly applicable to traditional vertical thin-film scraped evaporators, where the scraper working surface is located at the radial outer edge. During evaporator operation, the elastic buffer mechanical structures such as springs and connecting rods used for scraper position adjustment do not contact the feed liquid. Horizontal scraped evaporators employ flooded evaporation, meaning the feed liquid immerses the heat exchange plates and scrapers, and the scraper working surface is located at the two axial side edges. The aforementioned disclosed scraper adjustment structures, such as springs and connecting rods, are prone to clogging and jamming problems when applied to the complex feed liquid system of horizontal scraped evaporators, leading to the failure of the scraper adjustment structure. Summary of the Invention

[0003] The present invention aims to provide an adaptive scraper for an evaporator and a scraped evaporator to solve the problems of rigid scrapers in existing horizontal scraped evaporators that cannot adaptively adjust their width and height, are prone to scratching the heat exchange plates, and are not thoroughly cleaned. The invention achieves adaptive adjustment of the scraper in its width and height, and cleans without blind spots. The technical problem to be solved by the present invention is achieved through the following technical solution.

[0004] An adaptive scraper for an evaporator includes a scraper holder and scraper blades. The improvement is that the scraper holder includes a shaft seat and at least one blade support mounted on the shaft seat. Each blade support has at least one segment of scraper blades, and each segment of scraper blades has at least two identical elongated holes. The scraper blades are mounted on the blade support by a fastening assembly. After the fastening assembly and the blade support are fixed, the gap between them is greater than the thickness of the scraper blades to allow the scraper blades to adaptively displace in their thickness direction and adaptively displace through the elongated holes in their length or width direction.

[0005] Preferably, the length direction of each of the elongated holes is parallel to the width direction of the scraper blade to provide travel space for the scraper blade to adaptively displace in its width direction.

[0006] Preferably, the inner wall of the elongated hole is an inclined slope, which causes the length, width and diameter of the elongated hole to gradually decrease from the bottom surface of the scraper blade to the top surface. The surface of the scraper blade adjacent to the blade support is the bottom surface and the surface away from the blade support is the top surface.

[0007] Preferably, the scraper blade has a salt drainage groove on its surface adjacent to the blade support, and the salt drainage groove is connected to the elongated hole.

[0008] Preferably, at least two blade supports are uniformly provided on the bearing seat along its circumferential direction, and each blade support is provided with at least two scraper blades of different lengths along its length direction. The gap between two adjacent scraper blades on a blade support will be covered by a scraper blade on the adjacent blade support when the scraper rotates, leaving a blank on the heat exchange plate.

[0009] Preferably, the fastening assembly includes a pressure plate support cylinder that passes through the elongated hole and is clearance-fitted with the elongated hole, and a bolt that passes through the pressure plate support cylinder and presses the pressure plate support cylinder onto the blade support and is screwed to the blade support. The height of the pressure plate support cylinder is greater than the thickness of the scraper blade to provide the scraper blade with a travel space for adaptive displacement in its thickness direction.

[0010] Preferably, the fastening assembly further includes an elastic washer disposed between the bolt and the pressure plate support.

[0011] Preferably, it further includes a pressure plate, which is disposed between the scraper blade and the fastening assembly. The pressure plate is kept relatively fixed to the blade support by the fastening assembly. The scraper blade performs adaptive displacement in its thickness direction and adaptive displacement in its length or width direction within the gap between the pressure plate and the blade support.

[0012] Preferably, the pressure plate is provided with bolt holes that are matched with the elongated hole for bolts of the fastening assembly to be screwed in, and with flow holes that are matched with the elongated hole.

[0013] The present invention also provides a scraped evaporator, including a scraper, wherein the improvement is that the scraper is an evaporator adaptive scraper as described in any of the preceding inventions.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The scraper blade of this invention achieves adaptive displacement adjustment in its width direction by setting an elongated hole, and achieves adaptive displacement adjustment in its height direction by matching the height of the pressure plate support cylinder with the thickness of the scraper blade. This effectively solves the problem of scraper rubbing against the heat exchange plate caused by processing errors, cumulative installation errors and changes in the thickness of the fouling layer in the prior art, and effectively improves the operational stability of complex solution horizontal scraper evaporators.

[0016] The multi-segment scraper blades of the adjacent blade support of the present invention adopt a complementary design of long and short blades. During rotation or swinging, they cover each other in the segment gaps, and there are no blind spots in the scraper operation, which improves the cleaning efficiency and heat transfer effect of the evaporation operation. The oblong hole of the scraper blade is designed with a salt discharge groove on the back side facing the flow, which solves the problem of salt accumulation and blockage in the oblong hole under high salt liquid conditions, effectively improving the stability and adaptability of the equipment operation and ensuring that the equipment can operate stably for a long time.

[0017] Each scraper blade in this invention is an independent component and can be replaced individually as a separate module. The anti-salt accumulation structure formed by the elongated hole and the salt drainage channel can operate without external equipment, reducing equipment maintenance costs and meeting the needs of industrial mass production. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the adaptive scraper for the evaporator in this invention;

[0019] Figure 2 This is a schematic diagram of the scraper holder in this invention;

[0020] Figure 3 This is a schematic diagram of the scraper blade structure in this invention;

[0021] Figure 4 This is a schematic diagram of the scraper blade from another angle in this invention;

[0022] Figure 5 This is a schematic diagram of the assembly and installation of the scraper blades in this invention;

[0023] Figure 6This is a schematic diagram of the pressure plate in the present invention;

[0024] Figure 7 This is a schematic diagram of the connection between the scraper blade and the fastening assembly in this invention;

[0025] Figure 8 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0026] The reference numerals in the attached figures are as follows: 1. Scraper holder; 101. Blade support; 102. Shaft seat; 103. Rib plate; 2. Scraper blade; 201. Oblong hole; 202. Salt discharge trough; 3. Pressure plate; 301. Flow hole; 302. Bolt hole; 4. Fastening assembly; 401. Bolt; 402. Elastic gasket; 403. Pressure plate support cylinder; A. Short scraper blade; B. Long scraper blade. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] Example 1:

[0029] Reference Figures 1 to 7 As shown, an adaptive scraper for an evaporator includes a scraper holder 1 and scraper blades 2. The improvement is that the scraper holder 1 includes a shaft seat 102 and at least one blade support 101 disposed on the shaft seat 102. Each blade support 101 is provided with at least one segment of scraper blade 2. Each segment of scraper blade 2 is provided with at least two identical elongated holes 201. The scraper blade 2 is disposed on the blade support 101 by a fastening assembly 4. After the fastening assembly 4 and the blade support 101 are fixed, the gap between the two is greater than the thickness of the scraper blade 2 so that the scraper blade 2 can adaptively displace in its thickness direction and adaptively displace through the elongated holes 201 in its length or width direction.

[0030] Furthermore, refer to Figure 2 As shown, a rib 103 is provided between the bearing seat 102 and the blade support 101. The rib 103 is triangular, with a side length of 500mm and a thickness of 10mm.

[0031] Furthermore, the blade support 101 is provided with a plurality of connection holes for connection with the fastening assembly. The connection holes are M10 threaded holes.

[0032] Furthermore, the forming method of the scraper holder 1 can be integral casting or separate welding. The material of the scraper holder 1 can be titanium, duplex steel or stainless steel, etc.; further still, the scraper holder 1 is made of duplex steel 2205, which takes into account both corrosion resistance and mechanical strength to complex liquids.

[0033] Furthermore, the inner diameter of the bearing seat 102 is adapted to the scraper shaft of the scraper evaporator, and is φ150mm; a keyway with a length of 20mm and a depth of 8mm is opened on the inner wall of the bearing seat 102, and a positioning pin hole for positioning and fixing the scraper shaft is opened on the side wall of the bearing seat 102.

[0034] In this embodiment, the bearing seat 102 is used to fix the entire adaptive scraper onto the scraper shaft of the scraper evaporator and serves as the rotation center of the scraper blade 2. When the bearing seat 102 has one blade support 101, it is a single-blade scraper, suitable for swing-type horizontal scraper evaporators; when the bearing seat 102 has two or more blade supports 101, it is a multi-blade scraper, suitable for rotating horizontal scraper evaporators. The two or more blade supports 101 are evenly distributed around the circumference of the bearing seat 102, and the included angle between adjacent blade supports 101 is preferably 60~180°.

[0035] Furthermore, the bearing seat 102 is provided with two blade supports 101 circumferentially symmetrically, the included angle between the two blade supports 101 is 180°, and each blade support 101 has a length of 650mm, a width of 30mm and a thickness of 15mm.

[0036] In this embodiment, each section of the scraper blade 2 is provided with at least two identical elongated holes 201. These two identical elongated holes 201 can limit the relative position of the scraper blade 2 in one direction (length or width) to remain unchanged, while allowing adaptive displacement in the other direction. For example, if the length direction of at least two identical elongated holes 201 is parallel to the length direction of the scraper blade 2, then the scraper blade 2 maintains a constant relative position in its width direction and allows adaptive displacement in its length direction.

[0037] Furthermore, refer to Figure 3 , 4 As shown, the length direction of each of the elongated holes 201 is parallel to the width direction of the scraper blade 2 to provide the scraper blade 2 with a travel space for adaptive displacement in its width direction.

[0038] Furthermore, the length of the elongated hole 201 is 30% to 60% of the width of the scraper blade 2. Even further, the diameter of the elongated hole 201 is 15 mm and the length is 25 mm, and the elongated holes 201 on the blade support 101 are equidistant from each other at 75 mm intervals.

[0039] In this embodiment, the length direction of each elongated hole 201 is parallel to the width direction of the scraper blade 2, which can limit the relative position of the scraper blade 2 to remain unchanged in its length direction and adaptively displace it in its width direction. When this embodiment is applied to a horizontal scraped evaporator, when the side edge of the scraper in the axial direction of the scraper shaft touches the heat exchange plate wall or scale layer, the scraper blade 2 can be displaced to the other side along its width direction, that is, the axial direction of the scraper shaft, thereby avoiding rigid friction between the scraper and the heat exchange plate.

[0040] Furthermore, refer to Figure 3 , 4 As shown, the inner wall of the elongated hole 201 is an inclined slope. The inclined slope causes the length, width and diameter of the elongated hole 201 to gradually decrease from the bottom surface to the top surface of the scraper blade 2. The surface of the scraper blade 2 adjacent to the blade support 101 is the bottom surface and the surface away from the blade support 101 is the top surface.

[0041] Furthermore, the slope of the inclined surface is 1:50. Since the inner wall of the oblong hole 201 is an inclined surface, the cross-sectional shape of the oblong hole 201 shown in the longitudinal direction of the scraper blade 2 at the oblong hole 201 should be trapezoidal. However, because the slope of the inclined surface is very small, the actual cross-sectional shape of the oblong hole 201 here is almost rectangular. Therefore, Figure 4 The diagram illustrates that the cross-sectional shape of the oblong hole 201 is trapezoidal. Figure 7 The actual situation is used to express that the cross-sectional shape of the elongated hole 201 is almost rectangular.

[0042] Furthermore, a salt drainage groove 202 is provided on the surface of the scraper blade 2 adjacent to the blade support 101, and the salt drainage groove 202 is connected to the elongated hole 201.

[0043] Furthermore, the salt drainage groove 202 is formed along the width direction of the scraper blade 2 and extends to the sidewalls of the scraper blade 2 on both sides. The cross-sectional shape of the salt drainage groove 202 can be rectangular, fan-shaped, semi-circular, semi-elliptical, etc., and the width of the salt drainage groove 202 is 50% to 120% of the diameter of the oblong hole 201. Even further, the cross-sectional shape of the salt drainage groove 202 is semi-circular, with a diameter of 10 mm and a length of 50 mm, and the salt drainage grooves 202 formed on the scraper blade 2 are equidistantly spaced at 75 mm intervals.

[0044] In this embodiment, when the scraper rotates with the scraper shaft, the liquid in front of the scraper blade 2 continuously washes away the salt crystals and other dirt in the elongated hole 201. The salt crystals and other dirt are eventually discharged through the salt discharge groove 202 opened on the bottom surface of the scraper blade 2, thereby reducing the residue and blockage of salt crystals and other dirt in the elongated hole 201, and thus ensuring the smooth sliding displacement of the scraper blade 2 along its width direction.

[0045] Furthermore, the number of salt drainage channels 202 is the same as the number of elongated holes 201, and the width of the salt drainage channels 202 is adapted to the width of the elongated holes 201.

[0046] Furthermore, refer to Figure 5 As shown, at least two blade supports 101 are uniformly arranged on the bearing 102 along its circumferential direction. Each blade support 101 is provided with at least two scraper blades 2 of different lengths along its length direction. The gap between two adjacent scraper blades 2 on a blade support 101 will be covered by a section of scraper blade 2 on the adjacent blade support 101 when the scraper rotates, leaving a blank on the heat exchange plate.

[0047] Furthermore, the scraper blades 2 on at least one group of adjacent blade supports 101 are arranged in a staggered length pattern. A staggered length pattern means that the lengths of the scraper blades 2 on one blade support 101 are sequentially long, short, long, short… and the lengths of the scraper blades 2 on at least one blade support 101 adjacent to that blade support 101 are sequentially short, long, short, long…

[0048] Furthermore, there are two blade supports 101, and each blade support 101 has two segments of scraper blades 2, namely a short scraper blade A and a long scraper blade B. The two segments of scraper blades on one blade support 101 are, starting from the shaft seat 102, a short scraper blade A and a long scraper blade B, respectively; the two segments of scraper blades on the other blade support 101 are, starting from the shaft seat 102, a long scraper blade B and a short scraper blade A. Even further, the short scraper blade A has a length of 200mm, a width of 50mm, and a thickness of 8mm, and the long scraper blade B has a length of 400mm, a width of 50mm, and a thickness of 8mm. The gap between the short scraper blade A and the long scraper blade B is 50mm. In this embodiment, the spacing between adjacent heat exchange plates of the scraped evaporator is 55mm. When the scraper rotates, the scraper blade 2 on the next blade support 101 just covers the gap left by the gap between the two scraper blades 2 on the previous blade support 101, achieving full coverage within the scraper rotation trajectory, thus ensuring that there are no blind spots for cleaning on the heat exchange plate.

[0049] Furthermore, the outermost end of the scraper blade 2 on the blade support 101 is chamfered, with a chamfer size of R1mm. The scraper blade 2 is made of wear-resistant and corrosion-resistant materials such as polytetrafluoroethylene (PTFE), polyphenylene sulfide (PPS), polyetheretherketone (PEEK), Hastelloy, alumina ceramic, and silicon nitride ceramic. Even further, the scraper blade 2 is made of polyphenylene sulfide (PPS), which has a wear resistance temperature of up to 160℃.

[0050] This embodiment can achieve full cleaning coverage of the heat exchange plate surface within the scraper's rotation trajectory, with no blind spots or residue.

[0051] Furthermore, refer to Figure 7 As shown, the fastening assembly 4 includes a pressure plate support cylinder 403 that passes through the elongated hole 201 and is clearance-fitted with it, and a bolt 401 that passes through the pressure plate support cylinder 403 and presses it onto the blade support 101 and is screwed to it. The height of the pressure plate support cylinder 403 is greater than the thickness of the scraper blade 2 to provide the scraper blade 2 with a travel space for adaptive displacement in its thickness direction. Since the inner wall of the elongated hole 201 is a sloping surface, the cross-sectional shape of the elongated hole 201 shown in the longitudinal direction of the scraper blade 2 at the elongated hole 201 should be trapezoidal. However, since the slope of the sloping surface is very small, the actual cross-sectional shape of the elongated hole 201 here is almost rectangular. Therefore, Figure 4 The diagram illustrates that the cross-sectional shape of the oblong hole 201 is trapezoidal. Figure 7 The actual situation is used to express that the cross-sectional shape of the elongated hole 201 is almost rectangular.

[0052] Furthermore, refer to Figure 7 As shown, the fastening assembly 4 also includes an elastic washer 402, which is disposed between the bolt 401 and the pressure plate support cylinder 403.

[0053] Furthermore, the pressure plate support cylinder 403 is cylindrical, with an outer diameter that is 70% to 95% of the diameter of the elongated hole 201 and a height that is 1.2 to 1.5 times the thickness of the scraper blade 2.

[0054] Furthermore, the bolt 401 is M10, the elastic washer 402 is a wave-shaped elastic washer, the outer diameter of the pressure plate support cylinder 403 is 14mm, the inner diameter is 12mm, and the height is 12mm. Both the bolt 401 and the elastic washer 402 are made of duplex steel 2205.

[0055] Furthermore, refer to Figure 1 , 6As shown, it also includes a pressure plate 3, which is disposed between the scraper blade 2 and the fastening assembly 4. The pressure plate 3 is kept relatively fixed to the blade support 101 by the fastening assembly 4. The scraper blade 2 performs adaptive displacement in its thickness direction and adaptive displacement in its length or width direction within the gap between the pressure plate 3 and the blade support 101.

[0056] Furthermore, the pressure plate 3 is provided with bolt holes 302 that are screwed into the bolts 401 of the fastening assembly 4 and match the elongated hole 201, and a flow hole 301 that matches the elongated hole 201.

[0057] Furthermore, the pressure plate 3 is a rectangular strip, and the pressure plate 3 is used to press each section of the scraper blade 2 onto the blade support 101 of the scraper frame 1. The length of the pressure plate 3 is 80% to 95% of the length of the blade support 101, and the width is 60% to 100% of the length of the elongated hole 201 opened on the scraper blade 2 along its width direction.

[0058] Furthermore, the flow holes 301 are opened on both sides of the bolt holes 302 and along the width direction of the pressure plate 3.

[0059] Furthermore, the pressure plate 3 is made of duplex steel 2205, and the pressure plate 3 has a length of 580mm, a width of 25mm, and a thickness of 5mm. The pressure plate 3 has 6 bolt holes 302 with a diameter of φ12mm that correspond to the connecting holes on the blade support 101. Semi-circular flow holes 301 with a diameter of φ10mm are symmetrically opened on both sides of the bolt holes 302.

[0060] In this embodiment, refer to Figure 7 As shown, the pressure plate support cylinder 403 is placed at the connection hole of the blade bracket 101. The scraper blade 2 is sleeved on the pressure plate support cylinder 403 through the elongated hole 201. The pressure plate 3 is placed on the pressure plate support cylinder 403 and the bolt hole 302 of the pressure plate 3 is aligned with the pressure plate support cylinder 403. The elastic washer 402 is placed at the bolt hole 302 of the pressure plate 3. The bolt 401 passes through the elastic washer 402, the bolt hole 302 of the pressure plate 3, and the pressure plate support cylinder 403 in sequence and is screwed and fixed to the connection hole of the blade bracket 101. The elastic washer 402, pressure plate 3, and pressure plate support cylinder 403 are pressed and fixed to the blade bracket 101 by the bolt 401. Since the height of the pressure plate support cylinder 403 is greater than the thickness of the scraper blade 2 and the outer diameter is smaller than the diameter of the elongated hole 201, the scraper blade 2 is located in the space between the blade bracket 101 and the pressure plate 3 and can adaptively move along its width and height directions.

[0061] In this embodiment, the scraper blade 2 achieves adaptive displacement adjustment in its width direction by setting an elongated hole, and achieves adaptive displacement adjustment in its height direction by matching the height of the pressure plate support cylinder 403 with the thickness of the scraper blade 2. This effectively solves the problem of scraper rubbing against the heat exchange plate caused by processing errors, cumulative installation errors and changes in the thickness of the fouling layer in the prior art, and effectively improves the operational stability of the complex solution horizontal scraper evaporator.

[0062] In this embodiment, the multi-segment scraper blades 2 of the adjacent blade support 101 adopt a complementary design of long and short segments. During rotation or oscillation, they cover each other's segment gaps, eliminating blind spots in scraper operation and improving the cleaning efficiency and heat transfer effect of evaporation. The oblong hole 201 of the scraper blade 2 has a salt discharge groove 202 designed on the flow-facing back side, which solves the problem of salt accumulation and blockage in the oblong hole under high salt liquid conditions, effectively improving the stability and adaptability of equipment operation and ensuring that the equipment can operate stably for a long time.

[0063] In this embodiment, each scraper blade 2 is an independent component and can be used as a separate module. It can be replaced individually if damaged. The anti-salt accumulation structure formed by the elongated hole 201 and the salt drainage channel 202 can operate without maintenance without the need for external additional equipment, which reduces equipment maintenance costs and meets the needs of industrial mass production.

[0064] Example 2:

[0065] Reference Figure 8 As shown, the difference between this embodiment and Embodiment 1 is that: three blade supports 101 are evenly arranged circumferentially on the bearing seat 102, and the included angle between the three blade supports 101 is 120°; each of the three blade supports 101 is divided into two sections with scraper blades 2, the side of the blade support 101 adjacent to the bearing seat 102 is the inner side, and the side away from the bearing seat 102 is the outer side. The first blade support 101 has a long scraper blade B installed on the inner side and a short scraper blade A installed on the outer side, and the second and third blade supports 101 have a short scraper blade A installed on the inner side and a long scraper blade B installed on the outer side. The other parts are the same as in Embodiment 1 and will not be described again.

[0066] Example 3:

[0067] This embodiment provides a scraped evaporator, including a scraper, wherein the improvement is that the scraper is an adaptive scraper for evaporators as described in Embodiment 1.

[0068] This embodiment employs a two-blade evaporator with an adaptive scraper, meaning that the bearing seat 102 is circumferentially symmetrically provided with two blade supports 101, the included angle of which is 180°. This embodiment is suitable for evaporating complex solutions with an evaporation rate of 5~10 m³ / h, a feed solution salt content ≥15%, and a feed solution viscosity of 50-500 mPa·s.

[0069] In this embodiment, under the conditions of a scraper rotation speed of 35 rpm and an evaporation temperature of 80°C, the adaptive displacement range of the scraper blade 2 in its width direction is 0~5.5 mm, and the adaptive displacement range in its thickness direction is 0~4 mm. The multi-directional adaptive characteristics of the scraper blade 2 significantly improve the operational stability of the evaporator. After 1000 hours of operation, no scraping problems were found in the evaporator, and no salt accumulation or blockage was found in the oblong hole 201. The scraper has a significant effect on agitating the liquid and cleaning the surface of the heat exchange plate. The heat transfer coefficient of the evaporator is improved by about 35% compared with the traditional rigid scraper evaporator.

[0070] Example 4:

[0071] This embodiment provides a scraped evaporator, including a scraper, wherein the improvement is that the scraper is an adaptive evaporator scraper as described in Embodiment 2.

[0072] The three-blade scraper in this embodiment increases the scraping frequency of the heat exchange plate and the liquid. The complementary three-blade design achieves full cleaning coverage, and is especially suitable for the evaporation of complex solutions with a liquid viscosity >500mPa·s and an evaporation rate >10m³ / h.

[0073] This embodiment achieves full coverage and no blind spots in cleaning the heat exchange plate by using the complementary segmented length design of the scraper blades 2. The design of the elongated hole 201 with salt discharge function enables the adaptive displacement of the scraper blades 2 in the width direction. The structural design of the fastening component 4 enables the adaptive displacement of the scraper blades 2 in the thickness direction. This solves the technical problems of easy scraping of the scraper blades, blind spots in cleaning, and low heat exchange efficiency in existing horizontal scraper evaporators. It is suitable for deep volume reduction treatment of complex liquids with high viscosity, easy scaling, and high salt content in the fields of chemical, food, and pharmaceutical industries.

[0074] It should be noted that the above detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0075] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments described in this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0076] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0077] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0078] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, such as rotated 90 degrees or in other orientations, and the spatial relative descriptions used herein will be interpreted accordingly.

[0079] In the detailed description above, reference has been made to the accompanying drawings, which form part of this document. In the drawings, similar symbols typically identify similar parts unless the context otherwise indicates otherwise. The illustrated embodiments described in the detailed specification, drawings, and claims are not intended to be limiting. Other embodiments may be used and other changes may be made without departing from the spirit or scope of the subject matter presented herein.

[0080] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An adaptive scraper for an evaporator, comprising a scraper holder (1) and scraper blades (2), characterized in that: The scraper holder (1) includes a bearing seat (102) and at least one blade support (101) disposed on the bearing seat (102). Each blade support (101) is provided with at least one scraper blade (2). Each scraper blade (2) is provided with at least two identical elongated holes (201). The scraper blade (2) is disposed on the blade support (101) by a fastening assembly (4). After the fastening assembly (4) and the blade support (101) are fixed, the gap between them is greater than the thickness of the scraper blade (2) so that the scraper blade (2) can adaptively displace in its thickness direction and adaptively displace through the elongated holes (201) in its length or width direction. A salt drainage groove (202) is provided on the surface of the scraper blade (2) adjacent to the blade support (101). The salt drainage groove (202) is connected to the elongated holes (201).

2. The evaporator adaptive scraper according to claim 1, characterized in that: The length direction of each of the elongated holes (201) is parallel to the width direction of the scraper blade (2) to provide travel space for the scraper blade (2) to adaptively displace in its width direction.

3. The evaporator adaptive scraper according to claim 1, characterized in that: The inner wall of the elongated hole (201) is an inclined slope. The inclined slope causes the length, width and diameter of the elongated hole (201) to gradually decrease from the bottom surface to the top surface of the scraper blade (2). The surface of the scraper blade (2) adjacent to the blade support (101) is the bottom surface and the surface away from the blade support (101) is the top surface.

4. The evaporator adaptive scraper according to claim 1, characterized in that: At least two blade supports (101) are uniformly provided on the bearing seat (102) along its circumferential direction. Each blade support (101) is provided with at least two scraper blades (2) of different lengths along its length direction. The gap between two adjacent scraper blades (2) on a blade support (101) will be covered by a section of scraper blade (2) on the adjacent blade support (101) when the scraper rotates.

5. The evaporator adaptive scraper according to claim 1, characterized in that: The fastening assembly (4) includes a pressure plate support (403) that passes through the elongated hole (201) and is clearance-fitted with the elongated hole (201), and a bolt (401) that passes through the pressure plate support (403) and presses the pressure plate support (403) onto the blade bracket (101) and is screwed to the blade bracket (101). The height of the pressure plate support (403) is greater than the thickness of the scraper blade (2) to provide the scraper blade (2) with a travel space for adaptive displacement in its thickness direction.

6. The evaporator adaptive scraper according to claim 5, characterized in that: The fastening assembly (4) further includes an elastic washer (402) disposed between the bolt (401) and the pressure plate support (403).

7. The evaporator adaptive scraper according to claim 1, characterized in that: It also includes a pressure plate (3), which is disposed between the scraper blade (2) and the fastening assembly (4). The pressure plate (3) is kept relatively fixed to the blade support (101) by the fastening assembly (4). The scraper blade (2) performs adaptive displacement in its thickness direction and adaptive displacement in its length or width direction within the gap between the pressure plate (3) and the blade support (101).

8. An evaporator adaptive scraper according to claim 7, characterized in that: The pressure plate (3) is provided with bolt holes (302) that are matched with the elongated hole (201) for bolts (401) of the fastening assembly (4) to be screwed on, and with flow holes (301) that are matched with the elongated hole (201).

9. A scraped evaporator, comprising a scraper, characterized in that: The scraper is an evaporator adaptive scraper as described in any one of claims 1-8.

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