Protective shell structure for a flash dryer

Abstract

The utility model discloses a flash drying machine is with protective shell structure relates to flash drying machine technical field, aims at solving the technical problem of the poor functionality of the existing flash drying machine is with protective shell structure in the installation scraper cleaning cavity wall adhering material on the inner wall, including the protective shell, the protective shell includes cylinder shell, and the inside wall top, bottom of cylinder shell installs classifier and stirring broken assembly respectively, the cone cloth material tray shell of the utility model can make the further broken material of broken ascending, and the cone cloth material tray shell is cooperated with flat arc section, can be used for air guide, after the cavity wall adhering material of spiral section scraping and cleaning, under the action of centrifugal, make the majority of material scraped along the lower arc section re -imported on the stirring disc, and the hot air of flat arc section import can also increase the material separation speed in spiral section and lower arc section, and the structure of spiral, when rotating, will guide the airflow in the cavity to form spiral vortex, further prolongs the contact path of hot airflow and material.

Description

Technical Field

[0001] This utility model relates to the field of flash dryer technology, and more specifically, to a protective shell structure for a flash dryer. Background Technology

[0002] In numerous industrial sectors such as chemical, food, pharmaceutical, and mineral processing, flash dryers are widely used as highly efficient continuous drying equipment for processing paste-like, mushy, filter cake-like, and viscous granular materials. Their working principle involves a high-speed rotating agitator breaking down wet materials while simultaneously introducing a high-temperature hot airflow. This allows the material to fully contact the hot airflow within the drying chamber, achieving rapid drying under the combined action of centrifugal force, gravity, and airflow thrust. Finally, a grading device separates the qualified dried product. The protective shell is a crucial component of the flash dryer.

[0003] Existing flash dryer protective shell structures are mostly made of ordinary carbon steel or 304 stainless steel, which are prone to the following defects during operation: When processing highly viscous materials with low melting points (such as resins, paraffin wax, and certain slurries), high-speed stirring and airflow impact may cause the material to adhere to the inner wall of the drying chamber, forming "scaling". This not only affects heat transfer efficiency (increasing thermal resistance by more than 30%), but may also cause material coking due to local overheating, or even block the equipment (requiring frequent shutdowns for cleaning, affecting continuous production). To solve this problem, existing flash dryer protective shell structures generally have scrapers rotatably connected to the inner wall. The scrapers automatically clean the material adhering to the chamber wall during rotation, reducing manual intervention and reducing raw material waste. However, the scrapers are generally vertical structures, and most of the scraped material falls to the periphery of the inner wall of the protective shell structure under its own gravity. The material accumulates on the periphery of the inner wall, which is not conducive to further separation and drying, and is also easy to re-adhere to the inner wall of the drying chamber. In view of this, we propose a protective shell structure for flash dryers. Utility Model Content

[0004] The purpose of this invention is to provide a protective shell structure for a flash dryer to address the aforementioned shortcomings in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: it includes a protective shell, the protective shell comprising a cylindrical shell, and a classifier and a stirring and crushing assembly are respectively installed on the top and bottom of the inner sidewall of the cylindrical shell;

[0006] A flow guiding assembly is rotatably mounted on the inner wall of a cylindrical shell and can be driven by an electric motor. The flow guiding assembly includes a concentrically rotating conical material distribution disc shell inside the cylindrical shell. The conical material distribution disc shell is hollow inside and open at the bottom. A flat arc segment is provided on the side of the conical material distribution disc shell. A spiral segment is fixed at the end of the flat arc segment. The outer walls of the flat arc segment and the spiral segment fit against the inner wall of the cylindrical shell. A lower arc segment is fixed at the bottom of the spiral segment. The conical material distribution disc shell and the flat arc segment cooperate to guide air. The spiral segment is used to scrape off the material on the inner wall of the cylindrical shell. The lower arc segment is used to guide the material.

[0007] The cross-sections of the flat arc segment, spiral segment, and lower arc segment are all inverted "L" shape, with the vertical surface attached to the inner wall of the cylindrical shell, and the horizontal surface located at the top of the vertical surface to serve as a windbreak.

[0008] As a further description of the above technical solution: an inverted conical shell is fixed at the bottom of the cylindrical shell, and a discharge port, an air inlet, and a feed port are respectively opened at the top, bottom, and between the top and bottom of the cylindrical shell.

[0009] As a further description of the above technical solution: the mixing and crushing assembly includes a mixing disc rotatably connected to the bottom of the inner wall of the cylindrical shell, a conical center piece A fixed at the top axis of the mixing disc, and a plurality of crushing blades installed at intervals on the surfaces of the mixing disc and the conical center piece A, and an electric motor connected to the axis of the mixing disc via a connecting rod.

[0010] As a further description of the above technical solution: the power output end of the motor is connected to a stirring disc and a conical feeding disc shell via a connecting rod, and the top of the conical feeding disc shell is fixed with a flat arc segment, a spiral segment and a lower arc segment via a connecting rod.

[0011] As a further description of the above technical solution: the classifier includes a filter disc installed at the discharge port at the top of the cylindrical shell, and a number of classifying plates are fixed in a circumferentially equidistant array at the bottom of the filter disc, and a conical center piece B is fixed at the bottom of the classifying plates.

[0012] In the above technical solution, the protective shell structure for a flash dryer provided by this utility model has the following beneficial effects:

[0013] The conical feeding disc shell of this utility model can further crush the rising material. At the same time, the conical feeding disc shell, in conjunction with the flat arc section, can be used to guide air. After the spiral section scrapes and cleans the material adhering to the cavity wall, under the action of centrifugation, most of the scraped material is reintroduced onto the mixing disc along the lower arc section. Meanwhile, the hot air introduced by the flat arc section can also increase the material detachment speed in the spiral section and the lower arc section. Moreover, the spiral structure guides the airflow in the cavity to form a spiral vortex when rotating, further extending the contact path between the hot airflow and the material. This solves the problem of poor functionality in existing flash dryers that use protective shell structures with scrapers installed on the inner wall to clean the material adhering to the cavity wall. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0015] Figure 1 This is a schematic diagram of the exploded structure provided for an embodiment of the present utility model;

[0016] Figure 2 This is a schematic diagram of the flow guiding component provided in an embodiment of the present utility model;

[0017] Figure 3 A cross-sectional structural schematic diagram provided for an embodiment of this utility model;

[0018] Figure 4 This is a schematic diagram of the overall structure provided for an embodiment of the present utility model.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Protective shell; 2. Mixing and crushing assembly; 3. Flow guiding assembly; 4. Classifier;

[0021] 101. Cylindrical shell; 102. Inverted conical shell; 103. Air inlet; 104. Feed inlet; 105. Discharge outlet;

[0022] 201. Mixing disc; 202. Conical center component A; 203. Crusher blade; 204. Electric motor;

[0023] 301. Conical fabric disc shell; 302. Flat arc section; 303. Spiral section; 304. Lower arc section;

[0024] 401. Filter disc; 402. Grading plate; 403. Conical center piece B. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0026] Please see Figure 1 - Figure 4 The present invention provides a technical solution: including a protective shell 1, the protective shell 1 including a cylindrical shell 101, and a classifier 4 and a stirring and crushing component 2 respectively installed on the top and bottom of the inner side wall of the cylindrical shell 101;

[0027] The cylindrical shell 101 is preferably made of 304 stainless steel, and the inner wall is electrolytically polished. The top flange connects to the classifier 4, and the bottom is fixed with an inverted conical shell 102 to form a closed drying chamber. An air inlet 103 (equipped with a flange-type air valve) is opened at the bottom of the inverted conical shell 102. An oblique feed inlet 104 is provided in the upper middle part of the side wall of the cylindrical shell 101 (to facilitate the gravity flow of materials), and a discharge outlet 105 is opened in the center of the top (to be sealed and connected to the classifier 4).

[0028] In another embodiment of the present invention, an inverted conical shell 102 is fixed to the bottom of the cylindrical shell 101, and a discharge port 105, an air inlet 103 and a feed inlet 104 are respectively opened at the top, bottom and between the top and bottom of the cylindrical shell 101.

[0029] The flow guiding component 3 is rotatably installed on the inner wall of the cylindrical shell 101 and can be driven by the motor 204. The flow guiding component 3 includes a conical material distribution disc shell 301 that rotates concentrically inside the cylindrical shell 101. The conical material distribution disc shell 301 is hollow inside and open at the bottom. A flat arc section 302 is provided on the side of the conical material distribution disc shell 301. A spiral section 303 is fixed at the end of the flat arc section 302. The outer walls of the flat arc section 302 and the spiral section 303 fit against the inner wall of the cylindrical shell 101. A lower arc section 304 is fixed at the bottom of the spiral section 303. The conical material distribution disc shell 301 and the flat arc section 302 cooperate to guide air. The spiral section 303 is used to scrape off the material on the inner wall of the cylindrical shell 101. The lower arc section 304 is used to guide the material.

[0030] The cross-sections of the flat arc segment 302, the spiral segment 303, and the lower arc segment 304 are all inverted "L" shape, with the vertical surface attached to the inner wall of the cylindrical shell 101, and the horizontal surface located at the top of the vertical surface to serve as a windbreak.

[0031] The flow guiding component 3 preferably rotates coaxially with the mixing and crushing component 2 to save power resources. It is synchronously driven by the motor 204 and includes a conical feeding disc shell 301, which is hollow inside and open at the bottom. Preferably, the outer wall is polished to reduce material adhesion. The flat arc segment 302 can be set on the outer periphery of the conical feeding disc shell 301 or can extend radially along the maximum diameter of the conical feeding disc shell 301. The cross-section is an inverted "L" shape. The vertical surface fits against the inner wall of the cylindrical shell 101, and the horizontal surface is used to enhance the windproof effect. The spiral segment 303 is welded to the end of the flat arc segment 302. The spiral segment 303 fits against the inner wall of the cylindrical shell 101 and spirals downward along the inner wall of the cylindrical shell 101. Preferably, the vertical surface can be inlaid with wear-resistant ceramic plates, and the pressure of fitting against the inner wall is adjusted by a spring. The lower arc segment 304 is connected to the bottom of the spiral segment 303, bends along the arc of the inner wall of the inverted conical shell 102, and the end points to the inside of the mixing disc 201. It is inclined downward along the horizontal surface to guide the material back down.

[0032] In another embodiment of the present invention, the mixing and crushing assembly 2 includes a mixing disc 201 rotatably connected to the bottom of the inner wall of the cylindrical shell 101. A conical center piece A202 is fixed at the top axis of the mixing disc 201. A plurality of crushing blades 203 are installed at intervals on the surfaces of the mixing disc 201 and the conical center piece A202. A motor 204 is connected to the axis of the mixing disc 201 through a connecting rod.

[0033] In another embodiment of the present invention, the power output end of the motor 204 is connected to the stirring plate 201 and the conical cloth disc shell 301 via a connecting rod. The top of the conical cloth disc shell 301 is fixed with a flat arc segment 302, a spiral segment 303 and a lower arc segment 304 via a connecting rod.

[0034] The mixing and crushing assembly 2 is rotatably connected to the bottom of the inverted conical shell 102 via a bearing seat, and includes: a mixing disc 201, preferably made of wear-resistant cast iron, with its edges folded upwards to form a material retaining edge; a conical center piece A202, coaxially fixed with the mixing disc 201, used to crush and separate large pieces of material; a crushing blade 203 for crushing materials; and a drive shaft connected to the axis of the mixing disc 201 via a spline, the drive shaft passing through the inverted conical shell 102 via a mechanical seal, and its end connected to a motor 204 via a coupling.

[0035] In another embodiment of the present invention, the classifier 4 includes a filter disc 401 installed at the discharge port 105 at the top of the cylindrical shell 101. Several classifying plates 402 are fixed in a circumferentially equidistant array at the bottom of the filter disc 401, and a conical center piece B403 is fixed at the bottom of the classifying plates 402.

[0036] The classifier 4 is installed below the discharge port 105 via a flange and includes a filter disc 401 made of perforated stainless steel plate with its edges sealed to the inner wall of the cylindrical shell 101; multiple classifying discs 402 are radially fixed to the bottom of the filter disc 401, preferably with Teflon coating (to reduce adhesion); a conical center piece B403 is welded to the bottom of the classifying discs 402, with the cone apex facing downwards and coaxial with the conical center piece A202, so that the rising material can impact the conical center piece B403 and break the material again;

[0037] Working Principle: This embodiment provides a protective shell structure for a flash dryer. During use, an external power supply is used. The motor 204 is turned on via an external switch, driving the mixing and crushing assembly 2 and the flow guiding assembly 3 to rotate synchronously. Wet material is fed into the feed inlet 104, which can be used in conjunction with existing external feeding components. The wet material falls into the mixing disc 201 and is cut and crushed by the high-speed rotating crushing blades 203. Simultaneously, it is initially mixed with the high-temperature hot air entering from the air inlet 103, which is connected to an existing hot air supply component such as a hot air blower. The crushed material rises upwards under the action of centrifugal force and the thrust of the hot air flow. The material moves and impacts the bottom of the conical cloth disc shell 301, where it is further dispersed into fine particles. The flat arc section 302 guides the hot airflow to form a spiral vortex along the inner wall of the cylindrical shell 101, extending the airflow path and allowing the material to fully contact the hot air. At the same time, the spiral section 303 rotates with the flow guide component 3, continuously scraping off the material adhering to the inner wall of the cylindrical shell 101. Some of the scraped material slides down along the spiral surface and is guided back to the edge of the mixing disc 201 by the lower arc section 304, where it re-participates in the crushing and drying process, avoiding local overheating and coking. Meanwhile, the hot air introduced by the flat arc section 302 can also increase the material detachment speed in the spiral section 303 and the lower arc section 304.

[0038] The dried qualified material rises with the airflow, passes through the filter plate 401 after being rectified by the classifier plate 402, and is discharged from the outlet 105. The coarse particles fall due to the obstruction of the classifier plate 402 and gravity, and return to the drying chamber for reprocessing to ensure the uniformity of the product particle size (the mixing and crushing component 2, the classifier 4, and the motor 204 are all existing products and the motor 204 is connected to an external power supply and an external switch).

[0039] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A protective shell structure for a flash dryer, characterized in that, It includes a protective shell (1), which includes a cylindrical shell (101), and a classifier (4) and a stirring and crushing component (2) are respectively installed on the top and bottom of the inner side wall of the cylindrical shell (101); A flow guiding assembly (3) is rotatably mounted on the inner wall of a cylindrical shell (101) and can be driven by a motor (204). The flow guiding assembly (3) includes a conical fabric distribution disc shell (301) that rotates concentrically inside the cylindrical shell (101). The conical fabric distribution disc shell (301) is hollow inside and open at the bottom. A flat arc section (302) is provided on the side of the conical fabric distribution disc shell (301), and a spiral is fixed at the end of the flat arc section (302). The outer walls of the flat arc section (302) and the spiral section (303) are fitted and matched with the inner wall of the cylindrical shell (101). The bottom of the spiral section (303) is fixed with a lower arc section (304). The conical fabric disc shell (301) is matched with the flat arc section (302) for guiding air. The spiral section (303) is used to scrape the material on the inner wall of the cylindrical shell (101). The lower arc section (304) is used to guide the material. The cross-sections of the flat arc segment (302), spiral segment (303) and lower arc segment (304) are all inverted "L" shape, and the vertical surface is attached to the inner wall of the cylindrical shell (101). The horizontal surface is located at the top of the vertical surface and plays a role in blocking the wind.

2. The protective shell structure for a flash dryer according to claim 1, characterized in that, The bottom of the cylindrical shell (101) is fixed with an inverted conical shell (102), and the top, bottom and top-bottom of the cylindrical shell (101) are respectively provided with a discharge port (105), an air inlet (103) and a feed inlet (104).

3. The protective shell structure for a flash dryer according to claim 2, characterized in that, The mixing and crushing assembly (2) includes a mixing disc (201) rotatably connected to the bottom of the inner wall of the cylindrical shell (101). A conical center piece A (202) is fixed at the top axis of the mixing disc (201). Several crushing blades (203) are installed at intervals on the surfaces of the mixing disc (201) and the conical center piece A (202). A motor (204) is connected to the axis of the mixing disc (201) via a connecting rod.

4. The protective shell structure for a flash dryer according to claim 3, characterized in that, The power output end of the motor (204) is connected to the stirring plate (201) and the conical feeding plate shell (301) via a connecting rod. The top of the conical feeding plate shell (301) is fixed with a flat arc section (302), a spiral section (303) and a lower arc section (304) via a connecting rod.

5. The protective shell structure for a flash dryer according to claim 4, characterized in that, The classifier (4) includes a filter disc (401) installed at the discharge port (105) at the top of the cylindrical shell (101). The bottom of the filter disc (401) is fixed with a number of classifying plates (402) in a circumferentially equidistant array. The bottom of the classifying plates (402) is fixed with a conical center piece B (403).

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