A single cone dryer

Abstract

This invention relates to a single-cone dryer. The invention includes a main body; a stirring assembly, which is inserted into the main body and includes a hollow stirring shaft and hollow spiral blades connected to the outer wall of the hollow stirring shaft. A water pipe is disposed inside the hollow stirring shaft, forming a water inlet channel. A water return channel is formed between the inner wall of the hollow stirring shaft and the outer wall of the water pipe. The top end of the water pipe extends to the top end of the hollow stirring shaft, which has an inlet and an outlet. The inlet is connected to the inlet of the water inlet channel. An internal heat exchange channel is formed inside the hollow spiral blades, with its inlet connected to the outlet of the water inlet channel and its outlet connected to the inlet of the water return channel. The outlet of the water return channel is connected to the outlet. A jacket assembly is disposed on the outer wall of the main body. A drive assembly is disposed above the main body and is drively connected to the hollow stirring shaft. This invention can increase the heat exchange area and improve the uniformity of material heating.

Description

Technical Field

[0001] This invention relates to the field of drying equipment technology, and in particular to a single cone dryer. Background Technology

[0002] Single cone dryers are typically used for vacuum drying, mixing, and solvent recovery of powders, granules, or pastes. During operation, moisture or solvent removal is achieved through a combination of heating the outer wall of the container, material agitation, and vacuum suction.

[0003] Traditional single-cone dryers typically have solid agitators, relying mainly on the outer jacket for heat exchange. This results in a limited heat exchange area, leading to insufficient heating of materials near the center, which can cause prolonged drying times, uneven heating, and localized agglomeration.

[0004] In addition, existing single cone dryers mostly use stainless steel, carbon steel and other metal materials for the cylinder and solid agitator. Although they can meet the drying needs of general materials, in acidic materials, highly corrosive media or material scenarios that are sensitive to metal ion contamination, the metal inner wall is prone to corrosion, contamination of materials or shortening of equipment service life. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome at least one of the following problems in the prior art: insufficient corrosion resistance of single cone dryers under acidic material conditions, limited heat exchange area due to reliance on external jacket heat exchange, and low drying efficiency.

[0006] To solve the above-mentioned technical problems, the present invention provides a single cone dryer, comprising: ontology; A stirring assembly is disposed within the main body. The stirring assembly includes a hollow stirring shaft and hollow spiral blades connected to the outer wall of the hollow stirring shaft. A water pipe is disposed inside the hollow stirring shaft, forming a water inlet channel inside the water pipe. A water return channel is formed between the inner wall of the hollow stirring shaft and the outer wall of the water pipe. The top end of the water pipe extends to the top end of the hollow stirring shaft. The top end of the hollow stirring shaft is provided with a water inlet and a water outlet. The water inlet is connected to the inlet of the water inlet channel. An internal heat exchange channel is formed inside the hollow spiral blades. The inlet of the internal heat exchange channel is connected to the outlet of the water inlet channel. The outlet of the internal heat exchange channel is connected to the inlet of the water return channel. The outlet of the water return channel is connected to the water outlet. A jacket assembly is disposed on the outer side wall of the body and forms an external heat exchange cavity between the jacket assembly and the body. The external heat exchange cavity is connected to an external heat exchange medium inlet and an external heat exchange medium outlet. A drive assembly is disposed above the main body and is connected to the hollow stirring shaft for driving the stirring assembly to rotate within the main body.

[0007] In one embodiment of the present invention, both the inner and outer walls of the body are provided with an enamel anti-corrosion layer.

[0008] In one embodiment of the present invention, a first connecting pipe is further included. The first connecting pipe is disposed between the end of the water pipe and the end of the hollow spiral blade. The two ends of the first connecting pipe are respectively connected to the outlet of the water inlet channel and the inlet of the internal heat exchange channel.

[0009] In one embodiment of the present invention, a second connecting pipe is further included. The second connecting pipe is disposed between the side wall of the hollow stirring shaft and the starting end of the hollow spiral blade. The two ends of the second connecting pipe are respectively connected to the outlet of the inner heat exchange channel and the inlet of the return water channel.

[0010] In one embodiment of the present invention, a blocking ring is provided between the inner wall of the hollow stirring shaft near the inlet of the return water channel and the outer wall of the water pipe to form the return water channel.

[0011] In one embodiment of the present invention, the drive assembly includes a bracket mounted on the body and a geared motor mounted on the bracket. The geared motor is connected to the hollow stirring shaft in a driving connection, and a mechanical seal is provided between the hollow stirring shaft and the body.

[0012] In one embodiment of the present invention, a reinforcing connecting rod is provided between the hollow spiral blade and the hollow stirring shaft at the portion located between the starting end and the ending end; a connecting joint is provided at the top end of the hollow stirring shaft, and the connecting joint is provided with the water inlet and the water outlet.

[0013] In one embodiment of the present invention, the main body includes a cylinder and a cylinder cover that cooperate with each other, and the cylinder cover is provided with a feeding hole.

[0014] In one embodiment of the present invention, the cylinder cover is further provided with one or more of the following: a temperature measuring hole, a pressure measuring hole, a vacuum port, a hand hole, a sight glass, and a liquid level measuring hole; a temperature measuring sampling valve is provided at the side end of the cylinder body, and a discharge valve is provided at the bottom end of the cylinder body.

[0015] In one embodiment of the present invention, the cylinder is inverted conical in shape, and a wall-scraping gap of the same size is formed between the hollow spiral blade and the inner wall of the cylinder, the wall-scraping gap being arranged along the extending direction of the inverted conical inner wall of the cylinder.

[0016] The technical solution of the present invention has the following advantages compared with the prior art: This invention discloses a single-cone dryer that, by incorporating a water pipe within a hollow stirring shaft and an internal heat exchange channel within the hollow spiral blades, allows the heat exchange medium to circulate and exchange heat within the stirring assembly. This enables the stirring assembly to simultaneously agitate and heat the material. This structure increases the heating of the central area of ​​the material and the area being agitated. Furthermore, the jacket assembly forms an external heat exchange chamber, which, combined with the internal heat exchange channel of the hollow spiral blades, creates a dual heat exchange structure combining external wall heat exchange and internal stirring heat exchange. This overcomes the problems of traditional single-cone dryers that primarily rely on external jacket heat exchange and suffer from insufficient heating in the central area. It expands the heat exchange area, improves heat transfer efficiency, shortens drying time, improves heating uniformity, and reduces localized agglomeration and incomplete drying.

[0017] The dryer body of the present invention is provided with a glass-lined anti-corrosion layer on both the inner and outer walls, which can effectively isolate the metal substrate from corrosive materials, reduce the corrosion of the cylinder by acidic media, reduce the risk of metal ion contamination of materials, and extend the service life of the equipment. Attached Figure Description

[0018] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure of the single cone dryer of the present invention.

[0020] Figure 2 This is a cross-sectional view of a hollow spiral blade.

[0021] Figure 3 yes Figure 1 A magnified view of a portion of point A in the middle.

[0022] Figure 4 yes Figure 1 A magnified view of a portion of point B in the middle.

[0023] Figure 5 This is a schematic diagram of the cylinder cap structure.

[0024] Explanation of reference numerals in the instruction manual: 1. Body; 11. Cylinder; 12. Cylinder cover; 121. Feeding port; 122. Temperature measuring port; 123. Pressure measuring port; 124. Vacuum port; 125. Hand hole; 126. Sight glass; 127. Liquid level measuring port; 13. Temperature sampling valve; 14. Discharge valve; 2. Stirring assembly; 21. Hollow stirring shaft; 211. Water inlet; 212. Water outlet; 213. Water return channel; 22. Hollow spiral blades; 221. Internal heat exchange channel; 23. Water pipe; 231. Water inlet channel; 24. First connecting pipe; 25. Second connecting pipe; 26. Baffle ring; 27. Reinforcing connecting rod; 28. Connecting joint; 3. Enameled anti-corrosion layer; 4. Drive assembly; 41. Bracket; 42. Gear motor; 43. Mechanical seal; 5. Jacket assembly; 51. Jacket; 52. External heat exchange cavity; 53. External heat exchange medium inlet; 54. External heat exchange medium outlet. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0026] In this invention, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this invention, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0027] In this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number. In the description of this invention, the terms "first" and "second" are used only to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0028] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention based on the specific content of the technical solution.

[0029] Reference Figures 1 to 5 As shown, a single cone dryer of the present invention includes: Ontology 1; A stirring assembly 2, inserted within the main body 1, includes a hollow stirring shaft 21 and hollow spiral blades 22 connected to the outer wall of the hollow stirring shaft 21. A water pipe 23 is installed inside the hollow stirring shaft 21, forming an inlet channel 231. A return channel 213 is formed between the inner wall of the hollow stirring shaft 21 and the outer wall of the water pipe 23. The top end of the water pipe 23 extends to the top end of the hollow stirring shaft 21. The hollow stirring shaft 21 is provided with an inlet 211 and an outlet 212 at its top end. The inlet 211 is connected to the inlet of the water inlet channel 231. An internal heat exchange channel 221 is formed inside the hollow spiral blade 22. The inlet of the internal heat exchange channel 221 is connected to the outlet of the water inlet channel 231. The outlet of the internal heat exchange channel 221 is connected to the inlet of the return water channel 213. The outlet of the return water channel 213 is connected to the outlet 212. The jacket assembly 5 is disposed on the outer side wall of the body 1 and forms an external heat exchange cavity 52 between the body 1 and the body 1. The external heat exchange cavity 52 is connected to an external heat exchange medium inlet 53 and an external heat exchange medium outlet 54. The drive component 4 is disposed above the body 1 and is connected to the hollow stirring shaft 21 for driving the stirring component 2 to rotate inside the body 1.

[0030] With the above configuration, an inlet channel 231 is formed inside the water pipe 23, a return channel 213 is formed between the inner wall of the hollow stirring shaft 21 and the outer wall of the water pipe 23, and an inner heat exchange channel 221 is formed inside the hollow spiral blades 22. The heat exchange medium (such as hot water) can enter the hollow spiral blades 22 through the inlet channel 231 and directly exchange heat with the material through the hollow spiral blades 22. This allows the stirring assembly 2 to not only turn the material but also to supplement the heating of the central area of ​​the material and the turned material. Compared with a structure that relies solely on the outer jacket 51 for heat exchange, this structure increases the internal heat exchange area of ​​the equipment, allowing heat to be transferred to the material from both the outer wall of the main body 1 and the stirring assembly 2, improving the uniformity of material heating, shortening the drying time, and reducing the problem of insufficient heating in the central area.

[0031] Furthermore, the external heat exchange medium (such as hot steam) can form a continuous heat exchange area on the outside of the main body 1, transferring heat to the material inside the drying chamber through the wall of the main body 1, thereby heating the outer periphery of the material. After the external heat exchange chamber 52 is combined with the internal heat exchange channel 221 of the hollow spiral blades 22, a dual heat exchange method combining external wall heating and internal stirring heating can be formed, improving heat utilization efficiency and drying uniformity.

[0032] Specifically, both the inner and outer walls of the body 1 are provided with a glass-lined anti-corrosion layer 3. The glass-lined anti-corrosion layer 3 covers the inner surface area in contact with materials, isolating materials from metal and reducing corrosion of the body 1 by acidic materials or corrosive media. This is because glass-lined enameling has good acid corrosion resistance and surface density, preventing direct contact between materials and the metal cylinder 11 in acidic materials, highly corrosive media, or material handling scenarios sensitive to metal ion contamination. Simultaneously, the smooth surface of the glass-lined enameling prevents materials from easily adhering to the inner wall of the body 1, facilitating subsequent cleaning and batch production changes, and improving the equipment's applicability and service life.

[0033] Specifically, it also includes a first connecting pipe 24, which is disposed between the end of the water pipe 23 and the end of the hollow spiral blade 22. The two ends of the first connecting pipe 24 are respectively connected to the outlet of the water inlet channel 231 and the inlet of the internal heat exchange channel 221. In one embodiment, the first connecting pipe 24 is inclinedly disposed on the axis of the hollow stirring shaft 21.

[0034] The first connecting pipe 24 can stably introduce the heat exchange medium transported by the water pipe 23 into the hollow spiral blade 22. When the first connecting pipe 24 is inclined to the axis of the hollow stirring shaft 21, it can adapt to the spatial position difference between the water pipe 23 and the hollow spiral blade 22, making the connection path smoother and reducing the flow resistance of the heat exchange medium.

[0035] Specifically, it also includes a second connecting pipe 25, which is disposed between the side wall of the hollow stirring shaft 21 and the starting end of the hollow spiral blade 22. The two ends of the second connecting pipe 25 are respectively connected to the outlet of the inner heat exchange channel 221 and the inlet of the return water channel 213. In one embodiment, the second connecting pipe 25 extends radially along the hollow stirring shaft 21.

[0036] The second connecting pipe 25 can guide the heat exchange medium after heat exchange through the hollow spiral blades 22 back to the return water channel 213, so that the inlet water channel 231, the inner heat exchange channel 221 and the return water channel 213 form a complete cycle. When the second connecting pipe 25 extends radially along the hollow stirring shaft 21, it can shorten the connection distance between the outlet of the hollow spiral blades 22 and the inlet of the return water channel 213, improve the return water efficiency, and make the circulation of the heat exchange medium in the inner heat exchange channel 221 more stable.

[0037] Specifically, a baffle ring 26 is provided between the inner wall of the hollow stirring shaft 21 near the inlet of the return water channel 213 and the outer wall of the water pipe 23 to form the return water channel 213. The baffle ring 26 is connected by welding.

[0038] The baffle ring 26 separates the annular space between the hollow stirring shaft 21 and the water pipe 23, allowing the heat exchange medium to enter the hollow spiral blades 22 through the inlet channel 231 and then enter the return channel 213 via the hollow spiral blades 22, preventing cross-flow between the inlet and return sides. After being welded together, the baffle ring 26 improves the sealing reliability and structural strength of the connection, ensuring stable circulation of the heat exchange medium under long-term rotational conditions.

[0039] In one embodiment, the drive assembly 4 includes a bracket 41 mounted on the body 1 and a geared motor 42 mounted on the bracket 41. The geared motor 42 is drively connected to the hollow stirring shaft 21. A mechanical seal 43 is provided between the hollow stirring shaft 21 and the body 1 to maintain the sealed state inside the body 1 when the hollow stirring shaft 21 rotates. It is understood that the bracket 41 is also provided with bearing seats, etc., to support the rotation of the hollow stirring shaft 21.

[0040] It should be noted that when the drive assembly 4 is working, the geared motor 42 drives the hollow stirring shaft 21 to rotate through the transmission connector and coupling. The hollow stirring shaft 21 drives the hollow spiral blades 22 to rotate inside the cylinder 11. The hollow spiral blades 22 push the material to move upward along the inner wall of the cylinder 11, and cause some of the material to fall back or be pressed down towards the central area. The material near the inner wall of the cylinder 11 is continuously scraped and turned over under the action of the hollow spiral blades 22. The central material area and the wall material area are constantly exchanging positions, so that the material repeatedly contacts the heated wall surface of the cylinder body 1 and the heated stirring assembly 2.

[0041] In one embodiment, a reinforcing connecting rod 27 is provided between the hollow spiral blade 22 and the hollow stirring shaft 21 at the portion between the starting end and the ending end. The reinforcing connecting rod 27 can improve the connection strength and deformation resistance between the hollow spiral blade 22 and the hollow stirring shaft 21, reduce the risk of the hollow spiral blade 22 shaking, deforming or fatigue cracking when stirring high-viscosity materials or materials with a large load, thereby improving the operational stability and service life of the stirring assembly 2.

[0042] Reference Figure 4 As shown, the top end of the hollow stirring shaft 21 is provided with a connecting joint 28, and the connecting joint 28 is provided with the water inlet 211 and the water outlet 212.

[0043] Specifically, the main body 1 includes a cylinder 11 and a cylinder cover 12 that cooperate with each other, and the cylinder cover 12 is provided with a feeding hole 121.

[0044] In one embodiment, refer to Figure 5As shown, the cylinder cover 12 is also provided with one or more of the following: a temperature measuring hole 122, a pressure measuring hole 123, a vacuum port 124, a hand hole 125, a sight glass 126, and a liquid level measuring hole 127. The temperature measuring hole 122 can be used to install a temperature sensor; the pressure measuring hole 123 can be used to install a pressure gauge or pressure sensor; the hand hole 125 is used for inspection and cleaning; the sight glass 126 is used to observe the state of the material inside the drying chamber; and the liquid level measuring hole 127 is used to detect the liquid level or height of the material. The vacuum port 124 is used to discharge volatile moisture or solvent from the material.

[0045] Specifically, a temperature sampling valve 13 is provided on the side of the cylinder 11, and a discharge valve 14 is provided at the bottom of the cylinder 11. The temperature sampling valve 13 is used to detect the temperature of the material or take out a small sample of the material during the drying process, and to detect whether the moisture has evaporated during the drying process. The discharge valve 14 is used to discharge the material after drying is completed.

[0046] The equipment, with its temperature measuring port 122, pressure measuring port 123, sight glass 126, temperature sampling valve 13, and discharge valve 14, can operate stably under vacuum, heating, stirring, and solvent recovery conditions. It also allows operators to monitor temperature, pressure, material condition, and degree of dryness, thereby improving the safety and controllability of the drying process.

[0047] Specifically, the cylinder 11 is inverted conical in shape, and a scraping gap of the same size is formed between the hollow spiral ribbon blades 22 and the inner wall of the cylinder 11. The scraping gap is set along the extending direction of the inverted conical inner wall of the cylinder 11. The scraping gap can prevent the hollow spiral ribbon blades 22 from directly scratching the enamel anti-corrosion layer 3, and can also effectively disturb the material near the wall, reducing wall adhesion, crusting, and local overheating. The scraping gap is set along the extending direction of the inverted conical inner wall, so that the hollow spiral ribbon blades 22 are adapted to the shape of the cylinder 11, which can improve the continuity of material tumbling in the conical space, improve drying uniformity, and improve discharge smoothness.

[0048] Working principle: In use, the material to be dried is first added into the cylinder 11 through the feeding hole 121, and the drying chamber is evacuated by connecting to the external vacuum system through the vacuum port 124.

[0049] The external heat exchange medium enters the external heat exchange cavity 52 formed between the jacket assembly 5 and the main body 1 through the external heat exchange medium inlet 53, and flows within the external heat exchange cavity 52. ​​The heat of the heat exchange medium is transferred to the material in the drying cavity through the wall of the main body 1, heating the material near the inner wall of the cylinder 11. After completing the heat exchange, the external heat exchange medium is discharged through the external heat exchange medium outlet 54, thus forming an external heat exchange cycle.

[0050] Simultaneously, the internal heat exchange medium enters the water inlet channel 231 inside the water pipe 23 through the water inlet 211 at the top of the hollow stirring shaft 21, and flows downward along the water pipe 23. After flowing to the end of the water pipe 23, the internal heat exchange medium enters the inner heat exchange channel 221 inside the hollow spiral blade 22 through the first connecting pipe 24. The internal heat exchange medium flows along the hollow spiral blade 22 inside the inner heat exchange channel 221, and transfers heat to the material through the wall of the hollow spiral blade 22, so that the stirred and agitated material is heated inside the cylinder 11. After completing the heat exchange, the internal heat exchange medium enters the return water channel 213 formed between the inner wall of the hollow stirring shaft 21 and the outer wall of the water pipe 23 through the second connecting pipe 25, and returns upward along the return water channel 213, finally being discharged from the outlet 212.

[0051] During the heating process, the geared motor 42 drives the hollow stirring shaft 21 to rotate via a transmission connector or coupling. The hollow stirring shaft 21 then drives the hollow spiral ribbon blades 22 to rotate synchronously. As the hollow spiral ribbon blades 22 rotate, they push the material upwards along the inverted conical inner wall of the cylinder 11, while simultaneously causing some material to fall back or be pressed downwards towards the center, creating a circulating tumbling motion within the cylinder 11. The material near the inner wall of the cylinder 11 is continuously disturbed and moves away from the wall surface, while the material in the center area is continuously carried towards the heated area. This allows the material to repeatedly contact the heated wall surface of the main body 1 and the heated hollow spiral ribbon blades 22, improving the overall uniformity of heating.

[0052] Moisture or solvent in the material continuously evaporates under the combined heating action of the external heat exchange chamber 52 and the internal heat exchange channel 221. The evaporated moisture or solvent vapor is discharged through the vacuum port 124. During the drying process, the operator can monitor the temperature of the drying chamber through the temperature measuring port 122, monitor the pressure or vacuum degree through the pressure measuring port 123, observe the material turning state through the sight glass 126, and detect the material temperature or take out a small amount of material sample through the temperature measuring sampling valve 13 to determine the degree of material drying.

[0053] Once the material reaches the predetermined drying requirements, stop heating and stirring, open the discharge valve 14 at the bottom of the cylinder 11, and discharge the dried material.

[0054] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A single-cone dryer, characterized in that, include: Ontology(1); A stirring assembly (2) is installed inside the main body (1). The stirring assembly (2) includes a hollow stirring shaft (21) and hollow spiral blades (22) connected to the outer wall of the hollow stirring shaft (21). A water pipe (23) is provided inside the hollow stirring shaft (21). A water inlet channel (231) is formed inside the water pipe (23). A water return channel (213) is formed between the inner wall of the hollow stirring shaft (21) and the outer wall of the water pipe (23). The top end of the water pipe (23) extends to the top end of the hollow stirring shaft (21). The hollow stirring shaft (21) is provided with an inlet (211) and an outlet (212) at its top end. The inlet (211) is connected to the inlet of the water inlet channel (231). An internal heat exchange channel (221) is formed inside the hollow spiral blade (22). The inlet of the internal heat exchange channel (221) is connected to the outlet of the water inlet channel (231). The outlet of the internal heat exchange channel (221) is connected to the inlet of the return water channel (213). The outlet of the return water channel (213) is connected to the outlet (212). The jacket assembly (5) is disposed on the outer side wall of the body (1) and forms an external heat exchange cavity (52) between the body (1) and the external heat exchange cavity (52) is connected to an external heat exchange medium inlet (53) and an external heat exchange medium outlet (54). The drive assembly (4) is located above the body (1) and is connected to the hollow stirring shaft (21) for driving the stirring assembly (2) to rotate inside the body (1).

2. The single-cone dryer according to claim 1, characterized in that, The inner and outer walls of the main body (1) are provided with an enamel anti-corrosion layer (3).

3. A single-cone dryer according to claim 1, characterized in that, It also includes a first connecting pipe (24), which is located between the end of the water pipe (23) and the end of the hollow spiral blade (22). The two ends of the first connecting pipe (24) are respectively connected to the outlet of the water inlet channel (231) and the inlet of the internal heat exchange channel (221).

4. A single-cone dryer according to claim 1, characterized in that, It also includes a second connecting pipe (25), which is disposed between the side wall of the hollow stirring shaft (21) and the starting end of the hollow spiral blade (22). The two ends of the second connecting pipe (25) are respectively connected to the outlet of the inner heat exchange channel (221) and the inlet of the return water channel (213).

5. A single-cone dryer according to claim 1, characterized in that, The hollow stirring shaft (21) has a blocking ring (26) between its inner wall near the inlet of the return water channel (213) and the outer wall of the water pipe (23) to form the return water channel (213).

6. A single-cone dryer according to claim 1, characterized in that, The drive assembly (4) includes a bracket (41) mounted on the body (1) and a geared motor (42) mounted on the bracket (41). The geared motor (42) is connected to the hollow stirring shaft (21) for transmission. A mechanical seal (43) is provided between the hollow stirring shaft (21) and the body (1).

7. A single-cone dryer according to claim 1, characterized in that, The hollow spiral blade (22) is provided with a reinforcing connecting rod (27) between the portion located between the starting end and the end end and the hollow stirring shaft (21); the top end of the hollow stirring shaft (21) is provided with a connecting joint (28), and the connecting joint (28) is provided with the water inlet (211) and the water outlet (212).

8. A single-cone dryer according to claim 1, characterized in that, The main body (1) includes a cylinder (11) and a cylinder cover (12) that cooperate with each other, and the cylinder cover (12) is provided with a feeding hole (121).

9. A single-cone dryer according to claim 8, characterized in that, The cylinder cover (12) is also provided with one or more of the following: temperature measuring hole (122), pressure measuring hole (123), vacuum port (124), hand hole (125), sight glass (126), and liquid level measuring hole (127); a temperature measuring sampling valve (13) is provided on the side end of the cylinder (11), and a discharge valve (14) is provided on the bottom end of the cylinder (11).

10. A single-cone dryer according to claim 8, characterized in that, The cylinder (11) is inverted conical in shape, and the hollow spiral blade (22) forms a wall scraping gap of the same size between it and the inner wall of the cylinder (11). The wall scraping gap is set along the extension direction of the inverted conical inner wall of the cylinder (11).

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