Flash dryer

Abstract

The utility model discloses a flash dryer, and belongs to the technical field of pneumatic drying equipment. The device mainly comprises a control system, a drying chamber, a feeding system, a stirring and crushing system, a fan system and a dust removal system, hot air of the fan system enters the drying chamber through an airflow guide device, and a spiral fluidization distance reduction assembly connected with the drying chamber in a sealed mode is installed at the upper end of the drying chamber; the spiral fluidization distance reducing assembly comprises a circular truncated cone wind shield, a large-caliber flanging connecting piece which is fixedly connected with the lower end of the circular truncated cone wind shield in a sealed manner, and a small-caliber flanging connecting piece which is fixedly connected with the upper end of the circular truncated cone wind shield in a sealed manner; and the airflow flowing out of the small-caliber flanging connecting piece is dedusted by the dedusting system. Due to the design of the spiral fluidization distance reducing assembly, the spiral fluidization distance reducing assembly plays a role in screw pitch extrusion and acceleration on airflow in the drying chamber, and the spiral fluidization distance reducing assembly is small in overall size, small in occupied area, high in flexibility, high in practicability, high in market competitiveness, wide in application range and particularly suitable for places with limited space such as laboratories and small factories.

Description

Technical Field

[0001] This utility model belongs to the technical field of airflow drying equipment. Specifically, it relates to a flash dryer with a short spiral airflow pitch, good drying effect, small overall size, significantly reduced manufacturing cost, and is particularly suitable for spaces with limited space, such as laboratories. Background Technology

[0002] Flash dryers are high-efficiency drying equipment that integrates drying and fluidization technologies. They are widely used in the chemical, pharmaceutical, and food industries for the rapid drying of powdery, granular, and fibrous materials. Their working principle is based on the "flash evaporation" phenomenon, which uses a high-temperature airflow to rapidly evaporate moisture from the surface of wet materials, thereby achieving rapid drying.

[0003] Chinese patent CN206496606U, authorized on September 15, 2017, entitled "A Flash Dryer," discloses the structure and working principle of a traditional flash dryer. It mainly includes: an air supply device, a material dispersing mechanism, a material separation device, and a dust removal device. The air supply device comprises a blower, a heater, and an air distributor arranged sequentially. The blower draws in external air, the heater heats the drawn air, and the air distributor adjusts the output of hot air. The air distributor in the air supply device is connected to the bottom side of the dryer shell. The dryer shell is equipped with a structure at the bottom and a screw feeder in the middle. The screw feeder is used to feed the material into the dryer shell. The material dispersing structure is used to disperse the material. The material separation device includes a classifier and a cyclone separator. The classifier is connected to the top of the dryer shell, and the cyclone separator is connected to the classifier. The classifier is used to classify the material, and the cyclone separator is used to separate the material. The dust removal device includes a bag filter, an induced draft fan, and an induced draft duct. The bag filter is connected to the top of the cyclone separator through a pipe, the induced draft fan is connected to the bag filter through a pipe, and the induced draft duct is connected to the induced draft fan.

[0004] Traditional flash dryers, designed to maintain material in a fluidized state for an extended period (to improve drying efficiency), often feature tall and large drying chambers, resulting in a large footprint. The drying chamber alone can be approximately 2 meters high, and the entire unit occupies about 8-9 square meters. This bulky size often requires significant space, a drawback particularly pronounced in space-constrained environments such as laboratories. To address this issue, many laboratories have had to specifically seek out or modify large spaces to house traditional dryers, increasing site costs and disrupting the overall laboratory layout. Utility Model Content

[0005] The utility model discloses a drying spiral pitch is short, drying effect is good, drying machine whole volume is small, the obvious reduction manufacturing cost, especially suitable for laboratory and other space limited place's flash evaporation drying machine aiming at the deficiency of prior art.

[0006] The utility model is realized through the following technical schemes:

[0007] A flash evaporation drying machine, including control system for controlling drying machine operation, drying chamber for drying wet material, feeding system for conveying wet material to drying chamber, stirring and crushing system for stirring and crushing wet material in drying chamber, fan system for providing drying air flow for drying machine and dust removal system for capturing and separating material, hot air of fan system enters drying chamber through air flow guide device, and the upper end of drying chamber is provided with spiral fluidization pitch reduction assembly in close connection with it.

[0008] The spiral fluidization pitch reduction assembly includes a circular table wind shield, a large-diameter flange connector fixedly connected to the lower end of the circular table wind shield, and a small-diameter flange connector fixedly connected to the upper end of the circular table wind shield.

[0009] Preferably, the taper α of the circular table wind shield is 32°-45°.

[0010] Preferably, the taper α of the circular table wind shield is 35°.

[0011] Preferably, the air flow guide device is a first-stage centrifugal force strengthening device, and a second-stage centrifugal force strengthening device is fixedly connected between the small-diameter flange connector and the dust removal system.

[0012] Preferably, the flange end face of the large-diameter flange connector and the flange end face of the small-diameter flange connector are both provided with a groove for mounting a sealing ring.

[0013] Preferably, the first-stage centrifugal force strengthening device is a volute device, including a first-stage volute shell body provided with an air inlet, an air outlet, and a mounting port, and a guide cone body fixedly arranged at the rotation center position of the first-stage volute shell body.

[0014] Preferably, the first-stage volute shell body includes a first-stage volute main body, and the first-stage volute main body is fixedly connected with the bearing mounting box of the stirring and crushing system through the volute mounting seat in close connection with it.

[0015] Preferably, the secondary centrifugal force strengthening device is also a volute device, comprising a secondary volute shell provided with an air inlet and an air outlet, and a centrifugal guide assembly fixedly arranged at the rotation center of the secondary volute shell; the centrifugal guide assembly comprises a hollow cylinder fixedly integrated with the secondary volute shell and a hollow guide cone fixed at the free end of the hollow cylinder.

[0016] Preferably, the dust removal system comprises a cyclone separator in airtight communication with the secondary centrifugal force strengthening device, an air outlet of the cyclone separator is in airtight communication with an air inlet of the bag-type dust collector, and a clean air outlet of the bag-type dust collector is in airtight communication with a fan of the fan system; the cyclone separator and the bag-type dust collector are both provided with a dry material collector.

[0017] Preferably, the feeding system is an axial screw feeder; the stirring and crushing system comprises a stirring motor and a scattering stirring paddle driven to rotate by the stirring motor; the fan system further comprises a blower, the blower is in airtight connection with the primary centrifugal force strengthening device through a heater, and the primary centrifugal force strengthening device is in airtight connection with the bottom end of the drying chamber.

[0018] Compared with the prior art, the utility model has the advantages that:

[0019] 1. The design of the spiral flow shortening assembly has a spiral pitch extrusion and acceleration effect on the airflow in the drying chamber, the airflow is suddenly shortened in spiral pitch by the spiral flow shortening assembly in the process of spiral rising, the residence time of the material in the drying chamber is prolonged, and the drying performance of the drying machine is ensured while the volume of the drying chamber is greatly reduced.

[0020] 2. The high-speed and stable drying airflow from the spiral flow shortening assembly then enters the secondary centrifugal force strengthening device, the centrifugal force of the high-speed rotating airflow is further enhanced under the action of the secondary centrifugal force strengthening device, and the centrifugal force promotes the further full contact of the material and the hot air, so that the material drying efficiency is further improved.

[0021] 3. The spiral flow shortening assembly and the secondary centrifugal force strengthening device improve the treatment effect and separation effect of the airflow, realize more drying capacity in a smaller space, significantly reduce the volume of the equipment, and greatly reduce the equipment manufacturing cost and energy consumption.

[0022] 4. The flash drying machine has a floor area of only about 1.6 square meters and a drying chamber height of only about 0.8 meters; the drying chamber has a small volume and is easy to arrange; the whole machine has a small floor area, high flexibility, strong practicability, strong market competitiveness, and wide application range, and is especially suitable for limited space places such as laboratories and small factories. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1It is the flash dryer system process schematic diagram of the present application.

[0024] Figure 2 It is the flash dryer structure schematic diagram of the present application.

[0025] Figure 3 It is the flash dryer structure schematic diagram of the present application. Figure 2 It is the enlarged view of A in the present application.

[0026] Figure 4 It is the flash dryer structure schematic diagram of the present application. Figure 2 It is the enlarged view of B in the present application.

[0027] Figure 5 It is the spiral flow shortening assembly structure schematic diagram of the present application.

[0028] Figure 6 It is the spiral flow shortening assembly and secondary centrifugal force strengthening device assembly structure schematic diagram of the present application.

[0029] In the figure:

[0030] 1, feed system; 21, stirring motor; 22, dispersing stirring paddle; 23, bearing mounting box; 31, air supply fan; 32, air induction fan; 33, heater; 4, drying chamber; 5, secondary centrifugal force strengthening device; 51, secondary volute shell; 513, hollow cylinder; 514, hollow guide cone; 61, cyclone separator; 611, dry material collector; 62, bag type dust collector; 7, primary centrifugal force strengthening device; 71, primary volute shell; 711, primary volute main body; 712, volute mounting seat; 72, guide cone; 8, spiral flow shortening assembly; 81, circular table wind shield; 82, large-diameter flange connecting piece; 83, small-diameter flange connecting piece; 84, small-diameter weld; 85, large-diameter weld. DETAILED DESCRIPTION

[0031] In order to enable the reader to better understand the design purpose of the present application, the technical solutions described in the present application will be further described and explained below in conjunction with examples. It should be noted that the orientation terms that may be involved in the following paragraphs include but are not limited to "up, down, left, right, front, back" and the like, and the orientation thereof is based on the visual orientation shown in the drawings of the specification, which should not and should not be regarded as a limitation on the protection scope or technical solutions of the present application, and its purpose is only to facilitate those skilled in the art to better understand the technical solutions described in the present application creation.

[0032] In this specification, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] Example 1

[0034] like Figure 1 As shown, a flash dryer includes a control system for controlling the operation of the dryer, a drying chamber 4 for drying wet materials, a feeding system 1 for conveying wet materials to the drying chamber 4, a stirring and crushing system for stirring and crushing the wet materials inside the drying chamber 4, a fan system for providing drying airflow to the dryer, and a dust removal system for capturing and separating materials. The hot air from the fan system enters the drying chamber 4 via an airflow guide device. A spiral fluidizing tension reduction assembly 8 is installed at the upper end of the drying chamber 4 and is sealed to it. The spiral fluidizing tension reduction assembly 8 includes a frustum windshield 81, a large-diameter flanged connector 82 that is sealed and fixed to the lower end of the frustum windshield 81, and a small-diameter flanged connector 83 that is sealed and fixed to the upper end of the frustum windshield 81. The airflow flowing out of the small-diameter flanged connector 83 is dusted by the dust removal system. The lower end of the truncated cone windshield 81 is sealed and fixed to the large-diameter flanged connector 82 by welding, and the upper end of the truncated cone windshield 81 is sealed and fixed to the small-diameter flanged connector 83 by welding. The weld between the truncated cone windshield 81 and the large-diameter flanged connector 82 is a large-diameter weld 85, and the weld between the truncated cone windshield 81 and the small-diameter flanged connector 83 is a small-diameter weld 84. To ensure the airtightness of the spiral fluidized tension reduction assembly 8, both the small-diameter weld 84 and the large-diameter weld 85 require two full welding operations, one from the outside and one from the inside.

[0035] The working principle of the embodiment is as follows: hot air of the fan system enters the drying chamber 4 in a tangential direction and at a certain spiral speed under the action of the airflow guiding device. The particles with low moisture content and small particle size are carried upward by the rotating airflow and are dried in the process of rising. The stirring and crushing system in the drying chamber 4 fully disperses the larger and wetter materials, the dispersed materials are subjected to strong shearing, blowing, rotating action by the spiral airflow, and the materials are subjected to complex motions such as centrifugal force, shearing, collision and friction to form microparticles. In this process, the materials are dried. Subsequently, the dispersed materials rise in a fluidized state, and after rising to a certain height, enter the spiral fluidization pitch-reducing assembly. The airflow is suddenly shortened in pitch by the spiral fluidization pitch-reducing assembly 8 in the process of spiral rising, and the residence time of the materials in the drying chamber is forced to be extended, thereby strengthening the rapid heat transfer of the materials. In other words, the design of the spiral fluidization pitch-reducing assembly 8 can compress the pitch of the rotating airflow, thereby increasing the drying time, and good drying effect can be achieved. The airflow flowing out of the small-diameter flange connector 83 finally enters the dust removal system, which generally collects the materials in stages, and finally discharges the clean tail gas.

[0036] The design of the spiral fluidization pitch-reducing assembly of the embodiment plays a role in pitch extrusion and acceleration of the airflow in the drying chamber. The pitch of the airflow is suddenly shortened by the spiral fluidization pitch-reducing assembly in the process of spiral rising, the residence time of the materials in the drying chamber is extended, and the high efficiency of the drying machine is ensured while the volume of the drying chamber is greatly reduced.

[0037] Embodiment 2

[0038] On the basis of embodiment 1, the technical features involved therein and the functions and roles of the technical features in the present application are described in detail to help those skilled in the art fully understand the technical solutions of the present application and reproduce them.

[0039] As Figures 1-2As shown in the figure, a kind of flash dryer, including the control system for controlling the operation of the dryer, for drying wet material drying chamber 4, drying chamber 4 is visual type drying chamber.Wet material feeding system 1 to drying chamber 4, stirring and crushing the wet material inside the drying chamber 4 stirring and crushing system, for the dryer provides drying air flow fan system, and for capturing and separating material dust removal system, hot air of fan system enters drying chamber 4 through air flow guide device, the upper end of drying chamber 4 is provided with spiral fluidization shrinkage assembly 8 connected with it in airtight connection;Spiral fluidization shrinkage assembly 8 includes circular table wind shield 81, with the lower end of circular table wind shield 81 airtight fixed connection large diameter flange connector 82, with the upper end of circular table wind shield 81 airtight fixed connection small diameter flange connector 83;Air flow from small diameter flange connector 83 is dusted by dust removal system.The air flow guide device of the embodiment is a first centrifugal force strengthening device 7;Small diameter flange connector 83 and dust removal system are airtightly installed with a second centrifugal force strengthening device 5.

[0040] As shown in the figure, Figure 3 The first centrifugal force strengthening device 7 is a volute device, including a first volute shell 71 provided with an air inlet, an air outlet and a mounting port, and a guide cone 72 fixedly arranged at the rotation center position of the first volute shell 71. The first volute shell 71 further includes a first volute main body 711, which is fixedly connected with the bearing mounting box 23 of the stirring and crushing system through the volute mounting seat 712 in airtight connection, and the bottom of the guide cone 72 is fixed on the inner wall of the volute mounting seat 712. After the hot air enters the first volute main body 711, the centrifugal force is generated under the guidance of the guide cone 72.

[0041] As shown in the figure, Figure 4 The second centrifugal force strengthening device 5 is also a volute device in the embodiment. The second centrifugal force strengthening device 5 and the first centrifugal force strengthening device 7 have the same principle, both of which adopt a volute shell with an internal guide structure. The second centrifugal force strengthening device 5 specifically includes a second volute shell 51 provided with an air inlet and an air outlet, and a centrifugal guide assembly fixedly arranged at the rotation center position of the second volute shell 51. The centrifugal guide assembly includes a hollow column 513 fixedly integrated with the second volute shell 51 and a hollow guide cone 514 fixed at the free end of the hollow column 513. After the air flow spirally passing through the spiral fluidization shrinkage assembly 8 enters the second volute shell 51, the centrifugal force is further strengthened under the action of the centrifugal guide assembly, and the drying performance of the dryer is further improved.

[0042] The feeding system 1 of the embodiment is an axial screw feeding system; the stirring and crushing system comprises a stirring motor and a scattering stirring paddle 22 driven to rotate by the stirring motor; the fan system further comprises a supply fan 31, which is in airtight connection with the primary centrifugal force strengthening device 7 through a heater 33, and the primary centrifugal force strengthening device 7 is in airtight connection with the bottom end of the drying chamber 4. The dust removal system comprises a cyclone separator 61 in airtight communication with the secondary centrifugal force strengthening device 5 at an air inlet, the air outlet of the cyclone separator 61 is in airtight communication with the air inlet of a bag-type dust collector 62, and the clean air outlet of the bag-type dust collector 62 is in airtight communication with the induced fan 32 of the fan system; the discharge ports of the cyclone separator 61 and the bag-type dust collector 62 are each provided with a dry material collector 611. After the spiral airflow carrying the material enters the cyclone separator 61, a part of the relatively large material will be collected by the cyclone separator 61 under the action of the cyclone separator 61, the airflow carrying the smaller particle material enters the bag-type dust collector 62 for secondary filtration, and the bag-type dust collector 62 collects the small particle material, and the clean air is discharged by the induced fan 32.

[0043] As shown in Figure 5 , Figure 6 The flange end face of the large-diameter flange connecting piece 82 and the flange end face of the small-diameter flange connecting piece 83 are both provided with a groove for mounting a sealing ring. The large-diameter flange connecting piece 82 is fixedly connected to the upper end of the drying chamber 4 by a clamp, and the small-diameter flange connecting piece 83 is fixedly connected to the secondary centrifugal force strengthening device 5 by a clamp. The taper α of the circular-truncated-cone wind shield 81 is preferably 32°-45°; under this angle range, the drying effect of the embodiment is better. Further, the taper α of the circular-truncated-cone wind shield 81 is 35°.

[0044] The design of the spiral flow and pitch shortening assembly of the embodiment has a pitch extrusion and acceleration effect on the airflow in the drying chamber. In the process of spiral rising, the airflow is suddenly shortened in pitch by the spiral flow and pitch shortening assembly, the residence time of the material in the drying chamber is prolonged, and the high-efficiency drying performance of the dryer is ensured while the volume of the drying chamber is greatly reduced.

[0045] The high-speed and stable drying airflow discharged from the spiral flow and pitch shortening assembly then enters the secondary centrifugal force strengthening device. Under the action of the secondary centrifugal force strengthening device, the centrifugal force of the high-speed rotating airflow is further enhanced. This centrifugal force promotes the further sufficient contact between the material and the hot air, thereby further improving the material drying efficiency.

[0046] The spiral flow and pitch shortening assembly and the secondary centrifugal force strengthening device improve the processing and separation effects of the airflow, realize more drying capacity in a smaller space, significantly reduce the volume of the equipment, and greatly reduce the manufacturing cost and energy consumption of the equipment.

[0047] The embodiment has the advantages of only about 1.6 square meters of floor space, only about 0.8 meters of height of the drying chamber, small volume of the drying chamber, easy layout of the whole machine, less floor space of the whole machine, high flexibility, strong practicability, strong market competitiveness, wide application range, and especially suitable for limited space such as laboratories and small factories.

[0048] In conclusion, the above is only a preferred embodiment of the utility model, and is not used to limit the range of the utility model implementation, and any equivalent change and modification of shape, structure, feature and spirit within the range of the utility model claim should be included in the range of the utility model claim.

Claims

1. A flash dryer comprising a control system for controlling the operation of the dryer, a drying chamber (4) for drying wet material, a feeding system (1) for feeding the wet material into the drying chamber (4), a stirring and crushing system for stirring and crushing the wet material in the drying chamber (4), a fan system for providing a drying air flow for the dryer, and a dust removal system for capturing and separating the material, characterized in that: hot air of the fan system enters the drying chamber (4) through an air flow guide device, and a spiral fluidization and shortening assembly (8) is mounted at the upper end of the drying chamber (4) in airtight connection therewith; the spiral fluidization and shortening assembly (8) comprises a circular truncated cone wind shield (81), a large-diameter flange connector (82) fixedly connected in airtight manner with the lower end of the circular truncated cone wind shield (81), and a small-diameter flange connector (83) fixedly connected in airtight manner with the upper end of the circular truncated cone wind shield (81); and the air flow flowing out of the small-diameter flange connector (83) is removed by the dust removal system. The taper α of the circular truncated cone wind shield (81) is 32°-45°.

2. A flash dryer according to claim 1, characterised in that: The taper α of the circular truncated cone wind shield (81) is 35°.

3. A flash dryer according to claim 1, characterised in that: The air flow guide device is a primary centrifugal force strengthening device (7); and a secondary centrifugal force strengthening device (5) is mounted in airtight manner between the small-diameter flange connector (83) and the dust removal system.

4. A flash dryer according to claim 1, characterised in that: The flange end end face of the large-diameter flange connector (82) and the flange end end face of the small-diameter flange connector (83) are each provided with a groove for mounting a sealing ring; the large-diameter flange connector (82) is fixedly connected in airtight manner with the upper end of the drying chamber (4) by means of a clamp, and the small-diameter flange connector (83) is fixedly connected in airtight manner with the secondary centrifugal force strengthening device (5) by means of a clamp.

5. A flash dryer according to claim 4, characterised in that: The primary centrifugal force strengthening device (7) is a volute device, comprising a primary volute shell (71) provided with an air inlet, an air outlet and a mounting port, and a guide cone (72) fixedly arranged at the rotation center position of the primary volute shell (71).

6. A flash dryer according to claim 4, characterised in that: The primary volute shell (71) comprises a primary volute main body (711), which is fixedly connected with a bearing mounting box (23) of the stirring and crushing system through a volute mounting seat (712) in airtight connection therewith, and the bottom of the guide cone (72) is fixed to the inner wall of the volute mounting seat (712).

7. A flash dryer according to claim 6, characterised in that: The secondary centrifugal force strengthening device (5) is also a volute device, comprising a secondary volute shell (51) provided with an air inlet and an air outlet, and a centrifugal guide assembly fixedly arranged at the rotation center position of the secondary volute shell (51); the centrifugal guide assembly comprises a hollow column (513) fixedly integrated with the secondary volute shell (51) and a hollow guide cone (514) fixedly arranged at the free end of the hollow column (513).

8. A flash dryer according to claim 4, characterised in that: ​ 9. A flash dryer according to claim 4, characterised in that: The dust removal system comprises a cyclone separator (61) in closed communication with the secondary centrifugal force strengthening device (5), an air outlet of the cyclone separator (61) is in closed communication with an air inlet of a bag-type dust collector (62), a clean air outlet of the bag-type dust collector (62) is in closed communication with a fan (32) of a fan system; a dry material collector (611) is installed at a discharge port of the cyclone separator (61) and the bag-type dust collector (62).

10. A flash dryer according to claim 4, characterised in that: The feeding system (1) is a shaft type screw feeding; the stirring and crushing system comprises a stirring motor and a scattering stirring paddle (22) driven to rotate by the stirring motor; the fan system further comprises a fan (31) in closed connection with the primary centrifugal force strengthening device (7) through a heater (33), and the primary centrifugal force strengthening device (7) is in closed connection with a bottom end of the drying chamber (4).

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