A continuous powder drying apparatus

Abstract

The utility model discloses a continuous powder drying equipment, including traction fan, filter drying device, connecting pipeline, feeding device, cyclone separator, primary powder collecting jar and secondary powder collecting jar, the air inlet end of traction fan is communicated with the exhaust port of cyclone separator through connecting pipeline, and the air outlet end is communicated with the air inlet end of filter drying device through connecting pipeline, and the air outlet end of filter drying device is communicated with the tangent air inlet of cyclone separator, makes traction fan, filter drying device, cyclone separator connect gradually through connecting pipeline and forms gas circulation passageway, the connecting pipeline communication between the discharge port of feeding device and filter drying device and cyclone separator, and the outside of cyclone separator is equipped with heater, and primary powder collecting jar is detachably connected in the bottom discharge port of cyclone separator, and secondary powder collecting jar is detachably connected in the bottom of primary powder collecting jar, forms two -stage continuous powder collecting structure. It has simple structure, high drying efficiency, small heat loss and good drying effect and the advantages such as good drying effect.

Description

Technical Field

[0001] This utility model relates to the technical field of powder drying equipment, and more particularly to a continuous powder drying equipment. Background Technology

[0002] In industries such as chemical, pharmaceutical, and food processing, powdered materials are frequently required to be dried. Currently used powder drying equipment has several shortcomings, such as low drying efficiency, high energy consumption, easy powder agglomeration, and inability to operate continuously. For example, patent document CN222231220U discloses a continuous drying device for metal powder used in 3D printing. This device has the following drawbacks: First, it has a complex structure and high cost. Second, it uses a heater to heat the gas, and the hot gas exchanges heat with the powder in the drying tank, resulting in low drying efficiency and significant heat loss. Third, its feeding method is valve-based, which makes it impossible to control the feeding rate, leading to uneven feeding and severely reducing production efficiency and drying effect. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a continuous powder drying equipment with simple structure, high drying efficiency, low heat loss, uniform feeding and good drying effect.

[0004] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0005] A continuous powder drying equipment includes a traction fan, a filtration and drying device, connecting pipelines, a feeding device, a cyclone separator, a primary powder collection tank, and a secondary powder collection tank. The air inlet of the traction fan is connected to the exhaust port of the cyclone separator through the connecting pipeline, and the air outlet of the traction fan is connected to the air inlet of the filtration and drying device through the connecting pipeline. The air outlet of the filtration and drying device is connected to the tangential air inlet of the cyclone separator through the connecting pipeline, so that the traction fan, the filtration and drying device, and the cyclone separator are sequentially connected through the connecting pipeline to form a gas circulation path. The discharge port of the feeding device is connected to the connecting pipeline between the filtration and drying device and the cyclone separator. The cyclone separator is equipped with a heater for heating its inner wall. The primary powder collection tank is detachably connected to the bottom discharge port of the cyclone separator, and the secondary powder collection tank is detachably connected to the bottom of the primary powder collection tank, forming a two-stage continuous powder collection structure.

[0006] As a further improvement to the above technical solution:

[0007] Preferably, the feeding device includes a screw conveyor, the discharge port of which is connected to the tangential air inlet of the cyclone separator.

[0008] Preferably, the heaters are arranged uniformly along the circumference of the outer wall of the cyclone separator.

[0009] Preferably, the heater adopts a stainless steel tube structure with built-in heating wire, and the inner wall of the stainless steel tube is coated with an insulating coating.

[0010] Preferably, the filtration and drying device is provided with a desiccant for drying the gas in the gas circulation path.

[0011] Preferably, the traction fan is a variable frequency fan, and its air delivery direction is consistent with the flow direction of the gas circulation passage.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This utility model establishes a gas circulation path by setting up a traction fan, a filtration and drying device, and a cyclone separator, allowing the heated gas to be recycled, reducing heat loss and energy consumption. A heater is installed on the outer wall of the cyclone separator to heat the inner wall, enabling the powder to fully exchange heat with the hot inner wall and the heated gas during its spiral motion, greatly improving drying efficiency.

[0014] 2. In this utility model, the feeding device adopts a screw conveyor. The screw conveyor, combined with the airflow in the gas circulation path, can ensure the stable and controllable powder conveying amount, and also make the powder fully dispersed, thereby improving drying efficiency and drying quality and avoiding powder agglomeration.

[0015] 3. In this utility model, the two-stage powder collection tank is designed with a buffer, so there is no need to stop the machine when changing the powder collection tank, which can realize continuous powder collection and improve production efficiency.

[0016] 4. In this utility model, the desiccant in the filter drying device can dry the circulating gas and filter out impurities in the gas, ensuring the quality of the circulating gas and avoiding the impact of impurities on powder quality and equipment operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the external structure of the cyclone separator with a heater installed in this utility model.

[0019] legend:

[0020] 1. Traction fan; 2. Filter and drying device; 3. Connecting pipeline; 4. Feeding device; 5. Cyclone separator; 6. Heater; 7. Primary powder collection tank; 8. Secondary powder collection tank. Detailed Implementation

[0021] The utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1 and Figure 2 As shown in the figure, an embodiment of the continuous powder drying equipment of this utility model includes a traction fan 1, a filter drying device 2, a connecting pipeline 3, a feeding device 4, a cyclone separator 5, a primary powder collection tank 6, and a secondary powder collection tank 7. The inlet of the traction blower 1 is connected to the exhaust port of the cyclone separator 5 via connecting pipe 3. The outlet of the traction blower 1 is connected to the inlet of the filter-drying device 2 via connecting pipe 3. The outlet of the filter-drying device 2 is connected to the tangential inlet of the cyclone separator 5 via connecting pipe 3, thus connecting the traction blower 1, the filter-drying device 2, and the cyclone separator 5 sequentially to form a closed-loop gas circulation path. The outlet of the feeding device 4 is connected to the connecting pipe 3 between the filter-drying device 2 and the cyclone separator 5. The cyclone separator 5 is equipped with a heater 51 for heating its inner wall. The primary powder collection tank 6 is detachably connected to the bottom outlet of the cyclone separator 5, and the secondary powder collection tank 7 is detachably connected to the bottom of the primary powder collection tank 6, forming a two-stage continuous powder collection structure. The structure of this utility model allows the heated gas to be recycled, reducing heat loss and energy consumption. The heater installed on the cyclone separator heats its inner wall, allowing the powder to fully exchange heat with the hot inner wall and the heated gas during the spiral motion. This achieves uniform and efficient heating of the powder, greatly improving drying efficiency.

[0023] In this embodiment, the heater 51 adopts a stainless steel tube structure with built-in heating wire, and the inner wall of the stainless steel tube is coated with an insulating coating. The heater 51 is evenly arranged circumferentially along the outer wall of the cyclone separator 5 and is connected to an external power source (existing technology, not shown in the figure).

[0024] In this embodiment, the traction fan 1 is a variable frequency fan, which can control the gas circulation flow rate by adjusting the speed. The air delivery direction of the traction fan 1 is consistent with the flow direction of the gas circulation path (e.g., Figure 1 (As indicated by the arrow in the image), it is used to pressurize and transport the gas dried by the filter and dryer 2 to the cyclone separator 5, ensuring the orderly circulation of the gas within the system.

[0025] In this embodiment, the feeding device 4 includes a screw conveyor, which is installed on the connecting pipe 3 between the filter drying device 2 and the cyclone separator 5. The discharge port of the screw conveyor is connected to the tangential air inlet of the cyclone separator 5. While the screw conveyor is conveying material, it can be combined with the airflow conveying in the connecting pipe 3 to stably and disperse the powder into the cyclone separator 5.

[0026] In this embodiment, the primary powder collection tank 6 and the secondary powder collection tank 7 form a two-stage continuous powder collection structure. Both stages are detachable, facilitating the processing of collected powder and replacement of the collection tanks, thus enabling continuous operation. Preferably, the volume of the primary powder collection tank 6 is smaller than that of the secondary powder collection tank 7, which can serve as a buffer and temporary storage, preventing powder from directly impacting the secondary powder collection tank and causing it to accumulate and clump.

[0027] In this embodiment, the filter-drying device 2 is filled with a desiccant, which dries the circulating gas and filters out impurities in the gas. The side wall of the filter-drying device 2 is also provided with a removable maintenance door for easy periodic replacement of the desiccant.

[0028] The working principle of this utility model is as follows:

[0029] 1) Start the traction fan 1 and make it run in the set direction to establish a gas circulation path. Then start the heater 51. After the inner wall temperature of the cyclone separator 5 reaches the target temperature and stabilizes, start the feeding device 4.

[0030] 2) The feeding device 4 conveys the powder quantitatively to the discharge port through the screw conveyor, and then blows and suspends the powder discharged by the screw conveyor through the airflow in the connecting pipe 3 to form a gas-solid two-phase flow, which is sent into the cyclone separator 5 along the tangential air inlet.

[0031] 3) The gas-solid two-phase flow entering the cyclone separator 5 undergoes spiral motion. On the one hand, the powder is in direct contact with the inner wall heated by the heater 51, and on the other hand, it exchanges heat with the gas heated by the inner wall to achieve moisture evaporation and drying.

[0032] 4) The dried powder falls into the primary powder collection tank 6 for temporary storage under centrifugal force, and then falls naturally into the secondary powder collection tank 7 for centralized collection.

[0033] 5) The gas that has undergone heat exchange is discharged from the top exhaust port of the cyclone separator 5, enters the traction fan 1 through the connecting pipe 3, and is then pressurized by the fan and transported to the filter drying device 2. The desiccant adsorbs the moisture in the gas and filters out the fine powder entrained in the gas to avoid the circulation and pollution of impurities. The gas that has been dried and purified is discharged from the outlet of the filter drying device 2, and is mixed again with the powder newly output from the feeding device 4 before entering the cyclone separator 5 to complete the closed-loop gas circulation.

[0034] 6) When the secondary powder collection tank 7 is full, close the valve connecting it to the primary powder collection tank 6, disassemble and replace the empty tank (no need to stop the machine, to achieve continuous powder collection), and at the same time periodically open the inspection door of the filter drying device 2 to replace the saturated desiccant.

[0035] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A continuous powder drying device, characterized in that, It includes a traction fan (1), a filter and dryer (2), a connecting pipe (3), a feeding device (4), a cyclone separator (5), a primary powder collection tank (6), and a secondary powder collection tank (7); the air inlet of the traction fan (1) is connected to the exhaust port of the cyclone separator (5) through the connecting pipe (3), the air outlet of the traction fan (1) is connected to the air inlet of the filter and dryer (2) through the connecting pipe (3), and the air outlet of the filter and dryer (2) is connected to the tangential air inlet of the cyclone separator (5) through the connecting pipe (3), so that the traction fan ( 1) The filter drying device (2) and the cyclone separator (5) are connected in sequence through the connecting pipe (3) to form a gas circulation passage; the discharge port of the feeding device (4) is connected to the connecting pipe (3) between the filter drying device (2) and the cyclone separator (5); the cyclone separator (5) is equipped with a heater (51) for heating its inner wall; the first-stage powder collection tank (6) is detachably connected to the bottom discharge port of the cyclone separator (5); the second-stage powder collection tank (7) is detachably connected to the bottom of the first-stage powder collection tank (6) to form a two-stage continuous powder collection structure.

2. The continuous powder drying equipment according to claim 1, characterized in that, The feeding device (4) includes a screw conveyor, the discharge port of which is connected to the tangential air inlet of the cyclone separator (5).

3. The continuous powder drying equipment according to claim 1, characterized in that, The heater (51) is evenly arranged around the outer wall of the cyclone separator (5).

4. The continuous powder drying equipment according to claim 1, characterized in that, The heater (51) adopts a stainless steel tube structure with built-in heating wire, and the inner wall of the stainless steel tube is coated with an insulating coating.

5. The continuous powder drying equipment according to claim 1, characterized in that, The filter drying device (2) is equipped with a desiccant for drying the gas in the gas circulation path.

6. The continuous powder drying equipment according to claim 1, characterized in that, The traction fan (1) is a variable frequency fan, and its air delivery direction is consistent with the flow direction of the gas circulation passage.

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