CN111649562A - Internal heating type roller vacuum dryer - Google Patents

Abstract

The invention relates to an internal heating type roller vacuum dryer, which comprises a roller drying bin, a gear ring, an elbow device, a discharging device, a bracket, a heating groove, a driving device, a vacuum unit, an air duct, a heat insulation layer, a riding wheel and a hopper. The roller drying bin comprises a roller, helical blades, heating pipes and fixing strips. The heating pipe comprises a metal pipe, a heat conducting working medium and a heating device; the lower end of the heating pipe is fixed on the cylinder body in the roller. The heat energy carried by the medium in the heating groove conducts heat conduction and heats materials through a cylinder body in a roller of the roller drying bin and a heating pipe on the cylinder body, and the heat conduction and heat exchange area of a heater with heating strips is 8-35 times larger than that of a heating plate; the vacuum unit pumps air in the drying bin of the roller and moisture generated during drying of materials. When a certain heating pipe is damaged, leakage is generated, the use of the whole roller drying bin is not influenced, the material drying efficiency is improved, the material drying effect is optimized, and the drying device is green, energy-saving and environment-friendly.

Description

Internal heating type roller vacuum dryer

Technical Field

The invention relates to a roller vacuum dryer, in particular to an internal heating roller vacuum dryer.

Background

In the processing and production fields of grains, foods, chemical industry, medicines, agricultural and sideline products, pasture and the like, materials need to be heated and dried under a vacuum condition; the heat conduction of the roller drying bin of the roller vacuum dryer on the market is mostly carried out by heat exchange and heat dissipation in a calandria heat dissipation and interlayer heating mode, but the radiators of the heat transfer and heat dissipation bin are large in size, small in heat dissipation area and low in heat energy use efficiency. Wet materials often form lumps under a vacuum state, so that the drying of the wet materials is not uniform, and the drying quality of the materials is influenced. The heating pipe in cylinder drying storehouse trouble rate in the use is high, difficult maintenance. When a heating pipe in the drying bin is damaged and leaks, the whole roller drying bin cannot be used.

Heating pipes in a roller drying bin of a novel roller vacuum dryer on the market are gravity heat pipes, and heat energy can be conducted and heated only through a metal plate surface of a pipe head at the lower end of each heating pipe. The heat conducting area of the tube head at the lower end of the heating tube is limited, only a small amount of heat is input into the metal plate surface of the tube head with small heat exchange area, the heat conducting working medium influences the heat conducting heating of the heat conducting working medium in the tube cavity due to the limited heating area, the total heated heat energy of the heat conducting working medium is insufficient, the heating tube cannot output a large amount of heat energy, the material in the roller drying bin cannot obtain enough heat energy, and the material drying speed of the roller vacuum dryer is influenced.

Disclosure of Invention

The invention aims to solve the problem of overcoming the defects in the prior art and provides an internal heating type roller vacuum dryer.

In order to achieve the purpose, the invention is realized by the following technical scheme: the internal heating type roller vacuum dryer comprises a roller drying bin, a gear ring, an elbow device, a discharging device, a support, a heating groove, a driving device, a vacuum unit, an air duct, a heat insulation layer, a riding wheel and a hopper.

The gear ring is arranged on the roller drying bin, and the gear ring and the roller drying bin are fixedly connected into a whole.

The riding wheel is fixedly arranged on the bracket.

The support is made of metal steel such as angle iron and is welded to form the support frame device.

The riding wheels on the bracket support the roller drying bin, and the riding wheels support the feeding bin openings and the discharging bin openings at two ends of the roller drying bin.

The driving device is fixedly arranged on the bracket or fixedly arranged on the ground. The driving wheel of the driving device is meshed with the wheel teeth of the gear ring on the roller drying bin, and the gear ring drives the roller drying bin.

The roller drying bin is driven by a driving device, and the riding wheels of the roller drying bin on the bracket support the roller drying bin to rotate.

The driving device is an electric motor, a hydraulic motor or a pneumatic motor.

The heating groove is provided with a heat energy inlet and a heat energy outlet; the heating groove is bathtub-shaped; the heating groove is fixedly supported by a bracket and is directly and fixedly arranged on the ground.

The lower half part of the roller drying bin is soaked in a medium in the heating groove; the heating tank and the roller drying bin are not connected, and the roller distance between the heating tank and the roller drying bin is 50-100 mm.

When the roller drying bin rotates on the riding wheel, the heating groove is fixed.

The heat energy inlet of the heating groove is connected with an external heating source through a conduit, and the heat energy outlet of the heating groove is connected with the heating source through a conduit.

After the medium is heated by an external heating source, the medium carrying heat energy is conducted by a heat circulating pump on the guide pipe, and enters the heating tank through a heat energy inlet of the heating tank; the medium carrying heat energy conducts heat and heats the roller body of the roller drying bin; after the medium subjected to heat exchange and heat dissipation flows out of the heating groove through a heat energy outlet of the heating groove, the medium subjected to heat exchange and heat dissipation is conveyed into a heating heat source through a conduit to be heated again. The medium is heated and radiated in the heating groove, the conduit and the internal circulation of the heating heat source.

The heating source is a boiler, or a heat pump, or a combustion furnace.

The medium is water or heat conducting oil.

The heat insulation layers are arranged outside the roller drying bin and the heating groove for heat insulation; or without an insulating layer. The insulating layer is fixed. The distance between the heat-insulating layer and the roller drying bin is 10-100 mm, and the heat-insulating layer is attached to the outer surface of the heating tank. The heat preservation layer plays the heat retaining effect in the outside of cylinder drying storehouse and heating bath, avoids the heat energy heat dissipation.

The heat insulating layer is perlite cement board, or foam cement board, or composite silicate, or rock wool.

The elbow device comprises a flange joint, a sealing device and an elbow. The elbow of the elbow device is fixedly supported by the bracket.

The flange joint comprises a flange and a pipe body. The flange is fixedly arranged on the opening at one end of the pipe body, and the flange and the pipe body are fixedly connected into a whole.

The elbow is a metal pipe made of metal, and one end of the elbow is fixedly and hermetically connected with the flange joint through a sealing device. The sealing device is fixed on the outside of the elbow at the elbow end of the elbow discharge outlet and on the pipe body sleeve sealing device of the flange joint. The elbow end at the discharge outlet of the elbow and the flange joint are fixed and dynamically sealed by a sealing device, and the connection between the pipe at the discharge outlet of the elbow and the flange joint is sealed and airtight.

The sealing device is a magnetic fluid sealing device, or a dynamic sealing device, or a labyrinth sealing device.

The sealing device is a mature product. For example: the dynamic sealing device mainly comprises a dynamic ring and a static ring, certain sealing precision is provided between the abutting end faces of the dynamic ring and the static ring, and the dynamic ring and the static ring can rotate relatively to form mechanical dynamic sealing. The static ring of the dynamic sealing device on the metal pipe of the flange joint is sleeved on the dynamic ring of the dynamic sealing device on the elbow.

The magnetic liquid seal of the magnetic fluid sealing device utilizes the response characteristic of the magnetic liquid to a magnetic field. The magnetic liquid is injected into a magnetic conduction loop formed by a high-performance permanent magnet, a pole shoe with good magnetic conduction and a shaft to form a plurality of liquid O-shaped rings. When the magnetic fluid is under the action of pressure difference, the magnetic fluid can move in the non-uniform magnetic field, and at the moment, the non-uniform magnetic field can make the magnetic fluid produce magnetic force resisting the pressure difference so as to achieve new balance, so that the sealing effect can be achieved.

The flange joint at one end of the elbow device is fixedly connected with the feeding bin opening and the discharging bin opening of the roller drying bin, and the flange joint is fixedly connected with the feeding bin opening and the discharging bin opening of the roller drying bin into a whole. When the roller drying bin rotates, the flange joint rotates along with the roller drying bin; when the roller drying bin rotates, the elbow is static.

One end of the elbow is provided with a flange joint, and the other end of the elbow is provided with a discharging device. The other end of the elbow used for feeding is upward, and the discharging device is arranged on the upward elbow opening of the elbow; the other end of the elbow used for discharging is downward, and the discharging device is arranged on the downward elbow opening of the elbow.

One end of the discharging device is connected to the elbow, and the other end of the discharging device is connected with the hopper; the hopper and the discharging device are fixedly connected into a whole.

The hopper is made of a metal plate. The hopper plays a role in sorting and collecting bulk materials, and the bulk materials can conveniently enter the roller drying bin through the discharging device. Bulk materials discharged from the roller drying bin are collected and conveyed through the hopper.

The discharging device is a discharging valve or an air seal machine.

The discharging device is important equipment in a pneumatic conveying and ventilating dust removal network, and has the main functions of continuously and timely discharging materials in the drying bin and simultaneously ensuring that the pressure in the roller drying bin is not exposed to the normal pressure environment. The discharging device keeps dynamic sealing in the process of conveying materials, and reduces the air inflow of external air into the roller drying bin.

One end of the air duct penetrates through the elbow and extends into the roller drying bin, and the joint of the air duct and the elbow is fixed, sealed and airtight; the other end of the air duct is connected with a vacuum unit.

The air duct and the elbow are fixedly supported by a support frame; one end of the supporting frame is fixed on the elbow, and the other end of the supporting frame is fixed on the air duct. The support frame for supporting the air duct is a metal strip, so that the impact force of materials on the air duct is reduced, and the firmness of fixing the air duct is enhanced; the support frame fixed on the elbow does not influence the conveying of the materials at the feed inlet of the drying bin.

When the roller drying bin rotates, the air guide pipe is fixed; in the rotating process of the roller drying bin, the air guide pipe is fixedly sealed and airtight in connection with the elbow. The air duct extending into the roller drying bin is in an upward shape, and the air inlet of the air duct in the roller drying bin is close to the roller barrel on the upper part of the bin interior of the roller drying bin; the air duct in the upward shape is convenient for exhausting, and can prevent materials from entering the air duct.

The vacuum unit comprises a dust filtering device, a condenser and a vacuum pump; or a vacuum pump, a condenser; when the material without dust is dried, the dust filter device is not matched.

The dust in the moisture generated when the air and the materials in the roller drying bin are dried is filtered by the dust filtering device, and the dust in the moisture is filtered by the dust filtering device, so that the dust in the moisture is prevented from being adhered to the condenser, and the dust adhered to the condenser can influence the work of the condenser; after the condenser condenses the condensable gas of the moisture after filtering the dust into water, the condensed water is discharged out of the condenser by the drain valve, and the condensed gas is pumped out of the roller drying bin by the vacuum pump. A small volume of non-condensable gas remains; the power of the vacuum pump can be reduced by pumping the moisture with reduced volume, and the heat energy generated by condensation can be used again, so that the effects of waste heat utilization, energy conservation and emission reduction are achieved. The air pressure in the roller drying bin in the drying process is set according to the requirement of the drying temperature.

The diameter of the roller drying bin is 1200-2800 mm, and the length is 6800-18800 mm.

The roller drying bin comprises a roller, helical blades, heating pipes and fixing strips.

The cylinder body of the roller is made of a metal plate with the thickness of 5-18 mm.

The helical blade is fixed on the cylinder body in the roller. The height of the spiral blade is 180-580 mm, and the length is set according to the requirement; the spiral blade is made of a metal plate with the thickness of 1-5 mm; the number of the helical blades is 3-5. The lower end of the helical blade and the roller are fixed together by welding, and the helical blade and the roller are fixed into a whole by welding.

The helical blade synchronously rotates along with the rotating roller, and the helical blade can play a role in stirring the materials in the roller and pushing the materials to advance.

In the rotation process of the roller drying bin, the materials are stirred by the rotation of the helical blades, dead angles do not exist in the drying process of the materials, the materials cannot form caking, and the materials can be uniformly dried. Under the rotary propelling action of the helical blades, the materials flow from the feeding bin opening of the roller drying bin to the discharging bin opening of the roller drying bin to advance.

The diameter of the heating pipe is 28-58 mm, and the length is 305-1810 mm. The lengths of the heating pipes arranged in the roller drying bin are different; because the circumference of the peripheral cylinder body of the roller drying bin is large, the roller drying bin is selectively provided with the heating pipes with different lengths, the heating pipes which are arranged in a length-crossed mode are convenient to increase the installation quantity of the heating pipes, and the heat exchange area of heat energy in the roller drying bin is also increased.

The heating pipe comprises a metal pipe, a heat conducting working medium and a heating device.

The metal pipe is a metal pipe with one closed end; the metal tube is a light tube or a metal tube with fins on the tube wall. The metal tube with the fins can increase the heat conduction and heat exchange area and increase the conduction speed of heat energy.

The unsealed end of the metal tube is fixedly welded with the heating device into a whole, and the inner cavity of the tube after the metal tube and the heating device are welded and fixed is sealed and airtight; the heat conducting working medium is arranged in the inner cavity of the pipe after the metal pipe and the heating device are welded and fixed.

The heat conducting working medium is ethanol or other working media suitable for use.

The heating device comprises a heating plate, a heat-conducting medium and a heater.

The heat-conducting medium is water or other suitable medium.

The heating plate is made of a metal plate with the thickness of 1-5 mm, and the convex shape and the size of the heating plate are the same as the inner shape and the size of the cylinder body of the roller.

The heater is provided with a heating strip; the outer diameter of the heater is 15-50 mm, and the height of the heater is 38-580 mm.

And manufacturing the heater mold according to the requirements of the specification, the shape and the size of the required heater. The heater is formed by directly punching a metal plate into a suitable heater through a heater die by a punching machine, and the thickness of the metal plate of the heater is 0.1-1 mm.

The heating strip is hollow, and the convex appearance of the heating strip is conical.

The lower end of the heater is fixed on the heating plate, a cavity between the heater and the heating plate after fixed connection is sealed and airtight, and a heat-conducting medium is in the cavity between the heater and the heating plate; the cavity between the heating strip and the heater is communicated with the cavity between the heating plate and the heating strip, the hollow heating strip is convenient for the heat-conducting medium to conduct heat energy at the hollow part of the heating strip, and the heat energy carried by the heat-conducting medium is conducted out through the heating strip; the heat conducting working medium in the pipe inner cavity is scattered around the heating strips on the heater, so that the heat conducting and heating speed of the heat conducting working medium in the pipe inner cavity is improved.

The heating device is a heat pipe device. Under the condition of the space volume of the pipe inner cavity with the same size, the heat conduction and heat exchange area of the heater with the heating strips is 8-35 times larger than that of the heating plate; the heater with the heating strips enlarges the heat dissipation area of heat energy, the heat conducting medium conducts heat conduction and heat exchange of liquid-vapor phase change in the cavity between the heater and the heating plate, enough heat energy can be input into the heating plate with small area, the heater conducting heat exchange with large area can output a large amount of heat energy, and the heat energy conducted on the heater conducts heat conduction and heating for the heat conducting working medium in the tube cavity.

The heater of the heating device conducts heat conduction heating on the heat conduction working medium in the tube cavity.

The heating pipe is a heat pipe device, and a heater of the heating device conducts heat conduction heating on the heat conduction working medium in the pipe cavity. The liquid heat-conducting working medium in the tube cavity of the heating tube is vaporized after being heated by heat conduction of heat energy on the heater, the vaporized gaseous heat-conducting working medium moves in the tube cavity, the gaseous heat-conducting working medium conducts heat outwards through the metal tube and dissipates heat, the gaseous working medium is condensed into the liquid heat-conducting working medium, the condensed liquid heat-conducting working medium falls to the periphery of the heating strip on the heater by means of the gravity of the condensed liquid heat-conducting working medium and is heated and vaporized again, the heater conducting heat energy is provided for the heat-conducting working medium by the large-area heat-conducting heating heater, the heating device of the small-area heating plate can conduct heat energy for the heat-conducting working medium in the tube cavity, the heat-conducting working medium conducts heat exchange of liquid-vapor phase change in the tube cavity, and the heat energy carried by the heat-conducting working medium is conducted. The metal tube can output a large amount of heat, the heat energy is conducted to the materials piled around the heating tube, and the materials in the roller drying bin can be dried after obtaining the heat energy.

The boiling point temperature of the heat-conducting medium in the heating device and the boiling point temperature of the heat-conducting working medium in the inner cavity of the pipe are high; the heating device is internally provided with a heat-conducting medium with high boiling point temperature, and the inner cavity of the pipe is internally provided with a heat-conducting working medium with low boiling point temperature. The high-temperature heat energy conducted by the heating device is convenient for conducting heat and heating the heat-conducting working medium in the pipe inner cavity with the low-temperature boiling point, and the high-temperature conducted by the heat-conducting medium with the high boiling point temperature is convenient for increasing the heated vaporization speed of the heat-conducting working medium with the low boiling point temperature in the pipe inner cavity.

The lower end of the heating pipe is fixed on the cylinder body in the roller. Through electric welding, carry out fixed welding with the laminating junction of the barrel of heating device's of heating pipe lower extreme border and cylinder, the heating device of heating pipe and the barrel of cylinder pass through electric welding welded fastening laminating and connect as an organic wholely, and the heating pipe is along with the cylinder is rotatory together in step. The interior of the heating pipe is not communicated with the interior of the adjacent heating pipe, when one heating pipe is damaged and leaks, only the heating pipe does not work, and the use of the whole roller drying bin is not influenced.

The distance between the heating pipe and the adjacent heating pipe is 30-130 mm, the heating pipe and the adjacent heating pipe are fixedly supported by the fixing strip, the fixing strip is fixed on the heating pipe, the heating pipe fixedly supported by the fixing strip improves the firmness, and the heating pipe is prevented from being separated from the cylinder body of the roller.

The fixing strip is a twisted steel or a metal strip; the diameter of the fixing strip is 8-22 mm.

When the heating pipe rotates along with the drum in the rotating process of the drum drying bin for drying materials, the lower end of the heating pipe continuously changes the upper position and the lower position along with the rotation of the drum, and the heating device of the heating pipe continuously changes the upper position and the lower position. When some heating pipes are arranged above the roller, the heating devices of the heating pipes are arranged at the upper positions of the heating pipes, and when some heating pipes are arranged below the roller, the heating devices of the heating pipes are arranged at the lower positions of the heating pipes. Due to the working principle of the gravity heat pipe, when the heating device of the heating pipe faces downwards and is positioned below the heating pipe, the heat conducting working medium in the inner cavity of the pipe flows to the heating device below the heating pipe, heat energy on the barrel body of the roller conducts heat for the heating device of the heating pipe, and the heater of the heating device conducts heat for the heat conducting working medium in the inner cavity of the pipe.

The heating pipe in the cylinder of cylinder drying storehouse can carry out heat conduction heating for the material, plays the effect that will stir the material again when material drying work.

The material drying work flow of the internal heating type roller vacuum dryer is as follows:

firstly, starting a driving device, wherein a driving wheel of the driving device is meshed with and drives gear teeth of a gear ring on the roller drying bin, and the gear ring drives the roller drying bin to rotate; the roller drying bin is driven by a driving device, and the riding wheel of the roller drying bin on the support supports the roller to rotate.

And secondly, starting the discharging device, wherein the discharging device starts to rotate, wet materials in the hopper are conveyed by the discharging device, the materials enter the roller drying bin through the elbow device, and the materials in the roller drying bin flow from the feeding bin opening of the roller drying bin to the discharging bin opening of the roller drying bin under the action of the rotation propulsion of the helical blades.

And thirdly, starting a vacuum unit, and pumping air in the drying bin of the roller and moisture generated during material drying by the vacuum unit. Dust in the moisture that produces when the air in the dry storehouse of cylinder and material are dry passes through dust filter equipment's filtration treatment, and the condenser carries out the condensation processing with the moisture after filtering the dust, and the condensate water is by drain valve discharge condenser, and the gas after the condensation is by the dry storehouse of vacuum pump drainage cylinder. The relative pressure in the drum drying chamber was maintained at-0.055 Mpa.

Fourthly, heat energy carried by media in the heating groove conducts heat and heats materials through the barrel body of the roller and the heating pipe, the materials are uniformly stirred in the heating process of the heating pipe, the drying moisture uniformity of the materials is also improved, moisture in the materials in the drying bin of the roller is continuously vaporized, and the materials are dried.

And fifthly, under the action of the rotary propulsion of the helical blades, the dried materials are conveyed and discharged by the discharging device after passing through the discharging bin port of the roller drying bin and the elbow device.

The internal heating type roller vacuum dryer is a heat conduction drying machine which conducts heat energy to materials. The heat energy in the heating groove conducts heat to the materials through the heating pipes on the barrel body and the barrel body of the roller, and the heat energy is conducted to the materials in the roller through the heating pipes to conduct heat to heat. The conductive drying energy consumption index of the roller vacuum dryer is 2800-3500 kj/kg water, and the convection drying is 5500-8500 kj/kg water; the heat energy effective utilization rate of the convection drying is generally 20-50%, while the conduction drying can approach 100% theoretically, because the conduction drying does not need hot air to heat the materials, and the heat loss lost by the exhaust gas is small.

Compared with the prior roller vacuum dryer, the invention has the following beneficial effects: the internal heating type roller vacuum dryer is used for conducting heat energy to the materials for heat conduction and drying; the heat energy conducts heat to the materials through a barrel in a roller of the roller drying bin and a heating pipe on the barrel, the heat dissipation area of a heater with a heating strip is increased by 8-35 times, the heater conducts the heat energy to a heat conduction working medium, the heat conduction working medium conducts heat conduction and heat exchange of liquid-vapor phase change in a pipe inner cavity, and the heat energy is conducted to the materials in the roller through the heating pipe to conduct heat conduction; the vacuum unit pumps air in the drying bin of the roller and moisture generated during drying of materials. When one heating pipe is damaged and leaks, the use of the whole roller drying bin is not influenced. The heating pipe in the dry storehouse of cylinder can carry out heat conduction heating for the material, plays the effect that will stir the material at the dry during operation of material again, and the material drying quality in the dry storehouse of cylinder is even, promotes material drying efficiency and optimizes material drying effect, and green drying is energy-concerving and environment-protective.

Description of the drawings:

FIG. 1 is a schematic view of an internal heating type drum vacuum dryer according to the present invention;

FIG. 2 is a schematic cross-sectional view of an internal heating type drum vacuum dryer according to the present invention;

FIG. 3 is a schematic structural diagram of a drum drying chamber of the internal heating type drum vacuum dryer of the present invention;

FIG. 4 is a schematic structural diagram of an elbow device installed at a feed outlet of the internal heating type drum vacuum dryer according to the present invention;

FIG. 5 is a schematic structural diagram of an elbow device installed at a discharge outlet of the internal heating type roller vacuum dryer according to the present invention;

FIG. 6 is a schematic structural diagram of a heating pipe of a drum drying chamber of the internal heating type drum vacuum dryer according to the present invention;

fig. 7 is a schematic structural diagram of a heating device of a heating pipe of a drum drying bin of an internal heating type drum vacuum dryer according to the present invention.

In the drawings: 1. the device comprises a roller drying bin, 2, a gear ring, 3, an elbow device, 4, a discharging device, 5, a support, 6, a heating groove, 7, a driving device, 8, a vacuum unit, 9, an air guide pipe, 10, a riding wheel, 11, a discharging bin opening, 12, a feeding bin opening, 13, a heat energy outlet, 14, a heat energy inlet, 15, a heat preservation layer, 16, a medium, 17, a heating pipe, 18, a fixing strip, 19, a spiral blade, 20, a barrel body, 21, a roller, 22, a support frame, 23, a sealing device, 24, a flange joint, 25, a hopper, 26, an elbow, 27, a metal pipe, 28, a pipe inner cavity, 29, a heat conducting working medium, 30, a heating device, 31, a heating strip, 32, a heating plate, 33, a heater, 34 and a heat conducting medium.

The invention is further described below with reference to the accompanying drawings and examples.

Example (b):

referring to fig. 1 and 2, the internal heating type roller vacuum dryer comprises a roller drying bin 1, a gear ring 2, an elbow device 3, a discharging device 4, a bracket 5, a heating tank 6, a driving device 7, a vacuum unit 8, an air duct 9, an insulating layer 15, a riding wheel 10 and a hopper 25.

The gear ring 2 is arranged on the roller drying bin 1, and the gear ring 2 and the roller drying bin 1 are fixedly connected into a whole.

The riding wheel 10 is fixedly arranged on the bracket 5.

The roller drying bin 1 is supported by riding wheels 10 on the bracket 5.

The driving device 7 is fixedly arranged on the ground. The driving wheel of the driving device 7 is engaged with the wheel teeth of the gear ring 2 on the roller drying bin 1, and the gear ring 2 drives the roller drying bin 1.

The roller drying bin 1 is driven by a driving device 7, and the roller drying bin 1 is supported by a riding wheel 10 on a support 5 to rotate.

The drive means 7 is a hydraulic motor.

The heating tank 6 is provided with a heat energy inlet 14 and a heat energy outlet 13; the heating tank 6 is directly fixedly installed on the ground.

The lower half part of the roller drying bin 1 is soaked in the medium 16 in the heating groove 6, and the distance between the heating groove 6 and the roller 21 of the roller drying bin 1 is 60 mm.

When the roller drying bin 1 rotates on the riding wheel 10, the heating groove 6 is fixed.

The heat energy inlet 14 of the heating tank 6 is connected with an external heating source through a conduit, and the heat energy outlet 13 of the heating tank 6 is connected with the heating source through a conduit.

After the medium 16 is heated by an external heating source, the medium 16 carrying heat energy is conducted by a heat circulating pump on a conduit, and the medium 16 carrying heat energy enters the heating tank 6 through a heat energy inlet 14 of the heating tank 6; the medium 16 carrying heat energy conducts heat to the cylinder body 20 of the roller 21 of the roller drying bin 1; after the heat-exchanged and heat-dissipated medium 16 flows out of the heating groove 6 through the heat energy outlet 13 of the heating groove 6, the heat-exchanged and heat-dissipated medium 16 is conveyed into an external heating source through a conduit to be heated again. The medium 16 is heated and radiated by circulating in the heating tank 6, the conduit, and the heating source.

The heating heat source is a boiler.

The medium 16 is heat conducting oil.

The heat preservation layers 15 are arranged outside the roller drying bin 1 and the heating groove 6 for heat preservation; the interval between heat preservation 15 and the dry storehouse of cylinder 1 is 30mm, and heat preservation 15 laminating is on the outside of heating bath 6.

The insulating layer 15 is a perlite cement board.

The elbow unit 3 shown in fig. 1, 4 and 5 comprises a flange joint 24, a sealing unit 23 and an elbow 26. The elbow 26 of the elbow device 3 is fixedly supported by the bracket 5.

The flange joint 24 includes a flange and a pipe body. The flange is fixedly arranged on the opening at one end of the pipe body, and the flange and the pipe body are fixedly connected into a whole.

The elbow 26 is a metal pipe made of metal, and one end of the elbow 26 is fixedly and hermetically connected with the flange joint 24 through a sealing device 23. The sealing device 23 is fixed on the outside of the elbow at the elbow end of the discharge opening of the elbow 26 and the pipe body of the flange joint 24 is sleeved on the sealing device 23. The elbow end at the discharge opening of the elbow 26 and the flange fitting 24 are fixed and dynamically sealed by a sealing device 23, and the connection between the pipe at the discharge opening of the elbow 26 and the flange fitting 24 is sealed airtight.

The sealing device 23 is a magnetic fluid sealing device.

The flange joint 24 of one end of the elbow device 3 is fixedly connected with the feed bin port 12 and the discharge bin port 11 of the roller drying bin 1, and the flange joint 24 is fixedly connected with the feed bin port 12 and the discharge bin port 11 of the roller drying bin 1 into a whole. When the roller drying bin 1 rotates, the flange joint 24 rotates along with the roller drying bin 1; the elbow 26 is stationary while the drum drying silo 1 is rotating.

The other end of the elbow 26 of the elbow device 3 is upward as viewed in fig. 1 and fig. 4, and the discharge device 4 is at the mouth of the upward elbow 26 of the elbow 26.

The other end of the elbow 26 of the elbow device 3 is downward as viewed in fig. 1 and fig. 5, and the discharge device 4 is at the mouth of the downward elbow 26 of the elbow 26.

One end of the discharging device 4 is connected with the elbow 26, and the other end is connected with the hopper 25; the hopper 25 and the discharging device 4 are fixedly connected into a whole.

The hopper 25 is made of a metal plate. The hopper 25 plays a role in sorting and collecting bulk materials, so that the bulk materials can conveniently enter the roller drying bin 1 through the discharging device 4. The bulk material discharged from the drum drying bin 1 is collected and conveyed by a hopper 25.

The discharging device 4 is an air seal machine.

As shown in fig. 1, one end of the air duct 9 shown in fig. 4 passes through the elbow 26 and extends into the interior of the drum drying compartment 1; the other end of the air duct 9 is connected to the vacuum unit 8.

The air duct 9 and the elbow 26 are fixedly supported by a support frame 22; one end of the support frame 22 is fixed on the elbow 26, and the other end of the support frame 22 is fixed on the air duct 9. The support frame 22 for supporting the air duct 9 is a metal strip, and the support frame 22 reduces the impact force of the material on the air duct 9, thereby enhancing the firmness of fixing the air duct 9.

When the roller drying bin 1 rotates, the air duct 9 is fixed; the connection between the air duct 9 and the elbow 26 is fixed, sealed and airtight during the rotation of the drum drying chamber 1. The air duct 9 extending into the roller drying bin 1 is upward-shaped, and the air inlet of the air duct 9 in the roller drying bin 1 is close to the roller 21 and the barrel body 20 on the upper part of the bin inside the roller drying bin 1; the air duct 9 in the upward shape is convenient for exhausting air, and can prevent materials from entering the air duct 9.

The vacuum unit 8 comprises a dust filtering device, a condenser and a vacuum pump.

Referring to fig. 1, 2 and 3, the drum drying silo 1 has a diameter of 1800mm and a length of 8800 mm.

The roller drying bin 1 comprises a roller 21, a helical blade 19, a heating pipe 17 and a fixing strip 18.

The cylinder 20 of the roller 21 is made of 12mm metal plate.

The helical blade 19 is fixed on a cylinder body 20 in a roller 21; the number of the helical blades 19 is 3.

The helical blade 19 rotates synchronously with the rotating drum 21, and the helical blade 19 can play a role in stirring and pushing materials in the drum 21 to advance.

In the rotation process of the roller drying bin 1, the materials are rotationally lifted and stirred by the helical blades 19, no dead angle exists in material drying, the materials cannot form agglomeration, and the materials can be uniformly dried. Under the rotating and propelling action of the helical blades 19, the materials flow from the feeding bin port 12 of the roller drying bin 1 to the discharging bin port 11 of the roller drying bin 1 and advance.

The diameter of the heating pipe 17 is 48mm, and the heating pipe 17 with the length of 600mm and 300mm is arranged in the roller drying bin 1.

As shown in fig. 2, fig. 3 and fig. 6, the heating pipe 17 includes a metal pipe 27, a heat conducting working medium 29 and a heating device 30.

The metal tube 27 is a metal tube with one closed end; the metal tube 27 is a metal tube having fins on the tube wall.

The unclosed end of the metal pipe 27 and the heating device 30 are fixedly welded into a whole, and the heat conducting working medium 29 is arranged in the pipe inner cavity 28 formed by fixedly welding the metal pipe 27 and the heating device 30.

The heat conducting working medium 29 is ethanol.

The heating device 30 shown in fig. 2, 6 and 7 comprises a heating plate 32, a heat-conducting medium 34 and a heater 33.

The heat transfer medium 34 is water.

The material of the heating plate 32 is 1mm metal plate, and the convex shape and size of the heating plate 32 are the same as the inner shape and size of the cylinder 20 of the roller 21.

The heater 33 is provided with a heating strip 31.

The heater 33 is a heater 33 obtained by directly punching a metal plate into a suitable shape by a punch through a heater die, and the thickness of the metal plate for manufacturing the heater 33 is 0.5 mm.

The heating strip 31 is hollow, and the convex appearance of the heating strip 31 is conical.

The lower end of the heater 33 is fixed on the heating plate 32, the cavity between the heater 33 and the heating plate 32 after fixed connection is sealed and airtight, and the heat-conducting medium 34 is in the cavity between the heater 33 and the heating plate 32; the inner cavity of the heating strip 31 and the cavity between the heater 33 and the heating plate 32 are communicated, the hollow heating strip 31 facilitates the heat conducting movement of the heat conducting medium 34 at the hollow part of the heating strip 31, and the heat carried by the heat conducting medium 34 is conducted out through the heating strip 31; the heat conducting working medium 29 in the tube inner cavity 28 is scattered around the heating strips 31 on the heater 33, so that the heat conducting and heating speed of the heat conducting working medium 29 in the tube inner cavity 28 is increased.

The heating device 30 is a heat pipe device. Under the condition of the same space volume of the pipe inner cavity 28, the heat conduction and heat exchange area of the heater 33 with the heating strips 31 is 8-35 times larger than that of the heating plates 32; the heater 33 with the heating strips 31 enlarges the heat dissipation area of heat energy, and the heat conducting medium 34 conducts heat conduction and heat exchange of liquid-vapor phase change in the cavity between the heater 33 and the heating plate 32, so that enough heat energy can be input into the heating plate 32 with a small area, the heater 33 conducting heat exchange with a large area can output a large amount of heat energy, and the heat energy conducted on the heater 33 conducts heat conduction and heating to the heat conducting working medium 29 in the pipe inner cavity 28.

The heater 33 of the heating device 30 conducts heat to the heat conducting working medium 29 in the tube inner cavity 28.

The heating pipe 17 is a heat pipe device, and a heater 33 of the heating device 30 conducts heat to the heat conducting working medium 29 in the pipe inner cavity 28. The liquid heat-conducting working medium 29 in the tube inner cavity 28 of the heating tube 17 is vaporized after being heated by the heat conduction of the heat energy on the heater 33, the vaporized gas heat-conducting working medium 29 moves in the tube inner cavity 28, after the gaseous heat-conducting working medium 29 conducts heat outwards through the metal pipe 27 to dissipate heat, the gaseous working medium is condensed into the liquid heat-conducting working medium 29, the condensed liquid heat-conducting working medium 29 falls to the periphery of a heating strip 31 on a heater 33 by means of the gravity of the condensed liquid heat-conducting working medium and is heated and vaporized again, the heater 33 conducting heat and heating through large area provides heat energy for the heat-conducting working medium 29, a heating device 30 of a small area heating plate 32 can conduct heat energy for the heat-conducting working medium 29 in the pipe inner cavity 28, the heat-conducting working medium 29 conducts heat conduction and heat exchange of liquid-vapor phase change in the pipe inner cavity 28, and the heat energy carried by the heat-conducting working medium 29 is conducted to materials outside the pipe of the metal pipe 27 through the. The metal pipe 27 can output a large amount of heat, the heat energy is conducted to the materials accumulated around the heating pipe 17, and the materials in the roller drying bin 1 can be dried after obtaining the heat energy.

The boiling point temperature of the heat-conducting medium 34 in the heating device 30 and the boiling point temperature of the heat-conducting working medium 29 in the pipe inner cavity 28 are high.

For example: the heating device 30 selects a heat-conducting medium 34 water with high boiling point temperature, and the tube inner cavity 28 selects a heat-conducting working medium 29 ethanol with low boiling point temperature. The high temperature heat energy conducted by the heat conducting medium 34 water in the heating device 30 is convenient for conducting heat and heating the heat conducting working medium 29 ethanol in the pipe inner cavity 28 with the low temperature boiling point, and the high temperature conducted by the heat conducting medium 34 water with the high boiling point temperature is convenient for increasing the heated vaporization speed of the heat conducting working medium 29 ethanol with the low boiling point temperature in the pipe inner cavity 28.

As shown in fig. 2, 3 and 6, the lower end of the heating pipe 17 is fixed to the cylinder 20 in the drum 21. The edge of the heating device 30 at the lower end of the heating pipe 17 and the joint of the cylinder 20 of the roller 21 are fixedly welded by electric welding.

The interior of the heating pipe 17 is not communicated with the interior of the adjacent heating pipe 17, when one heating pipe 17 is damaged and leaks, only the heating pipe 17 does not work, and the use of the whole roller drying bin 1 is not influenced.

The distance between the heating pipe 17 and the adjacent heating pipe 17 is 80 mm.

The heating pipe 17 and the adjacent heating pipe 17 are fixedly supported by a fixing strip 18.

The fixing strip 18 is a twisted steel bar; the diameter of the fixing strip 18 is 8 mm.

In the rotation process of the drying materials in the drum drying bin 1, when the heating pipe 17 rotates along with the drum 21, the lower end of the heating pipe 17 continuously changes the up-down position along with the rotation of the drum 21, and the heating device 30 of the heating pipe 17 continuously changes the up-down position. Wherein some of the heating pipes 17 are above the drum 21, the heating device 30 of the heating pipe 17 is in an upper position of the heating pipe 17, wherein some of the heating pipes 17 are below the drum 21, the heating device 30 of the heating pipe 17 is in a lower position of the heating pipe 17. Due to the working principle of the gravity assisted heat pipe, when the heating device 30 of the heating pipe 17 is located at the lower position of the heating pipe 17 after the heating device 30 is located at the lower position of the heating pipe 17, the heat conducting working medium 29 in the pipe inner cavity 28 flows to the heating device 30 below the heating pipe 17, the heat energy on the cylinder 20 of the roller 21 conducts heat to the heating device 30 of the heating pipe 17, and the heater 33 of the heating device 30 conducts heat to the heat conducting working medium 29 in the pipe inner cavity 28.

The heating pipe 17 in the roller 21 of the roller drying bin 1 can conduct heat conduction and heat for materials and also plays a role in stirring the materials during the drying work of the materials.

The material drying work flow of the internal heating type roller vacuum dryer is as follows:

firstly, starting a driving device 7, wherein a driving wheel of the driving device 7 is meshed with and drives the wheel teeth of a gear ring 2 on a roller drying bin 1, and the gear ring 2 drives the roller drying bin 1 to rotate; the roller drying bin 1 is driven by a driving device 7, and a riding wheel 10 of the roller drying bin 1 on the support 5 carries out rotary motion.

Secondly, the discharging device 4 is started, the discharging device 4 starts to rotate, wet materials in the hopper 25 are conveyed by the discharging device 4, the materials enter the roller drying bin 1 through the elbow device 3, and under the action of rotary propulsion of the helical blades 19, the materials in the roller drying bin 1 flow from the feeding bin opening 12 of the roller drying bin 1 to the discharging bin opening 11 of the roller drying bin 1.

And thirdly, starting the vacuum unit 8, and exhausting air in the roller drying bin 1 and moisture generated during material drying by the vacuum unit 8. Dust in the moisture that produces when the air in the dry storehouse of cylinder and material are dry passes through dust filter equipment's filtration treatment, and the condenser carries out the condensation processing with the moisture after filtering the dust, and the comdenstion water is discharged the condenser by the drain valve, and the dry storehouse of cylinder 1 is pumped by the vacuum pump to the gas after the condensation, and the relative pressure in the dry storehouse of cylinder 1 keeps at-0.055 Mpa.

Fourthly, the heat energy carried by the medium 16 in the heating tank 6 conducts heat to the materials through the barrel 20 of the roller 21 and the heating pipe 17, the materials are uniformly stirred in the heating process of the heating pipe 17, the drying moisture uniformity of the materials is also improved, the moisture in the materials in the barrel drying bin 1 is continuously vaporized, and the purpose of drying the materials is achieved.

Fifthly, under the action of the rotary propulsion of the helical blades 19, the dried materials pass through the discharging bin opening 11 of the roller drying bin 1 and the elbow device 3, and then are conveyed and discharged by the discharging device 4.

The above embodiments are only used to help understand the manufacturing method and the core concept of the present invention, and the specific implementation is not limited to the above specific embodiments, and those skilled in the art can make changes without creative efforts from the above concepts, which all fall within the protection scope of the present invention.

Claims (6)

1. An internal heating type roller vacuum dryer comprises a roller drying bin (1), a gear ring (2), an elbow device (3), a discharging device (4), a support (5), a heating groove (6), a driving device (7), a vacuum unit (8), an air duct (9), a heat-insulating layer (15), a riding wheel (10) and a hopper (25); the method is characterized in that: the lower half part of the roller drying bin (1) is soaked in a medium (16) in the heating groove (6); the heat preservation layers (15) are arranged outside the roller drying bin (1) and the heating groove (6) for heat preservation;

the elbow device (3) comprises a flange joint (24), a sealing device (23) and an elbow (26); an elbow (26) of the elbow device (3) is fixedly supported by the bracket (5), and one end of the elbow (26) is fixedly and hermetically connected with the flange joint (24) by the sealing device (23);

a flange joint (24) at one end of the elbow device (3) is fixedly connected with a feed bin opening (12) and a discharge bin opening (11) of the roller drying bin (1); when the roller drying bin (1) rotates, the flange joint (24) rotates along with the roller drying bin (1), and the elbow (26) is static;

one end of the discharging device (4) is connected to the elbow (26), and the other end is connected to the hopper (25);

one end of the air duct (9) passes through the elbow (26), and the air duct (9) and the elbow (26) are fixedly supported by the support frame (22); the other end of the air duct (9) is connected to the vacuum unit (8);

the roller drying bin (1) comprises a roller (21), a helical blade (19), a heating pipe (17) and a fixing strip (18); the helical blade (19) is fixed on the cylinder (20) in the roller (21);

the heating pipe (17) comprises a metal pipe (27), a heat conducting working medium (29) and a heating device (30); the unclosed end of the metal pipe (27) is fixedly welded with the heating device (30) into a whole, the heat conducting working medium (29) conducts heat conduction and heat exchange of liquid-vapor phase change in the pipe inner cavity (28) after the metal pipe (27) and the heating device (30) are welded and fixed,

the heating device (30) comprises a heating plate (32), a heat-conducting medium (34) and a heater (33); the lower end of the heater (33) is fixed on the heating plate (32), the heat conducting medium (34) conducts heat conduction and heat exchange of 'liquid-vapor phase change' in a cavity between the heater (33) and the heating plate (32),

the heater (33) is provided with a heating strip (31), and the inner cavity of the heating strip (31) is communicated with the cavity between the heater (33) and the heating plate (32);

the boiling point temperature of the heat-conducting medium (34) in the heating device (30) and the boiling point temperature of the heat-conducting working medium (29) in the tube inner cavity (28) are high, and the heater (33) of the heating device (30) conducts heat conduction and heats the heat-conducting working medium (29) in the tube inner cavity (28);

the lower end of the heating pipe (17) is fixed on a cylinder body (20) in a roller (21), and the heating pipe (17) and the adjacent heating pipe (17) are fixedly supported by a fixing strip (18);

the material drying work flow of the internal heating type roller vacuum dryer is as follows:

firstly, a driving device (7) is started, a roller drying bin (1) is driven by the driving device (7), and a riding wheel (10) of the roller drying bin (1) on a support (5) carries out rotary motion;

secondly, starting the discharging device (4), conveying wet materials in the hopper (25) by the discharging device (4), enabling the materials to enter the roller drying bin (1) through the elbow device (3), and enabling the materials in the roller drying bin (1) to flow from a feeding bin opening (12) of the roller drying bin (1) to a discharging bin opening (11) of the roller drying bin (1) under the action of rotary propulsion of the helical blades (19);

thirdly, heat energy carried by a medium (16) in the heating groove (6) conducts heat on the materials through a cylinder body (20) of the roller (21) and a heating pipe (17) to heat the materials, and a vacuum unit (8) pumps air in the roller drying bin (1) and moisture generated during drying of the materials;

fourthly, after the dried materials pass through a discharging bin opening (11) of the roller drying bin (1) and the elbow device (3), the materials are conveyed and discharged by the discharging device (4).

2. An internally heated drum vacuum dryer according to claim 1, wherein: the driving device (7) is an electric motor, a hydraulic motor or a pneumatic motor.

3. An internally heated drum vacuum dryer according to claim 1, wherein: the discharging device (4) is a discharging valve or an air seal machine.

4. An internally heated drum vacuum dryer according to claim 1, wherein: the vacuum unit (8) comprises a dust filtering device, a condenser and a vacuum pump.

5. An internally heated drum vacuum dryer according to claim 1, wherein: the diameter of the roller drying bin (1) is 1200-2800 mm, and the length is 6800-18800 mm.

6. An internally heated drum vacuum dryer according to claim 1, wherein: the diameter of the heating pipe (17) is 28-58 mm, and the length is 305-1810 mm.

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