CN111998630A - Heat pipe type roller vacuum dryer - Google Patents

Abstract

The invention relates to a heat pipe type roller vacuum dryer which comprises a roller drying bin, a roller path, a gear ring, a three-way joint device, an elbow joint device, a discharging device, a vacuum unit, a support, a riding wheel and a driving device. The heating device comprises a heating pipe, a heat conduction pipe and a fixing strip. The heating pipe comprises a metal pipe, a heat-conducting working medium and a heating end enclosure; the heating end socket comprises a heating plate, a heat-conducting medium and a heater. The heat energy carried by the medium in the heat conducting pipe of the heating device conducts heat for the heating end enclosure through the pipe body of the heat conducting pipe, the heat radiating area of a heater with a heating strip of the heating end enclosure is increased by 8-35 times, the liquid heat conducting working medium in the pipe cavity of the heating pipe is vaporized after being heated through the heat conduction of the heat energy on the heating end enclosure heater, the heat conducting working medium conducts heat conduction and heat exchange of liquid-vapor phase change in the pipe cavity, the heat energy carried by the heat conducting working medium conducts heat conduction for the material outside the pipe of the metal pipe through the metal pipe, and the heat conducting drying effect on the material is improved.

Description

Heat pipe type roller vacuum dryer

Technical Field

The invention relates to a drum dryer, in particular to a heat pipe type drum vacuum dryer.

Background

In the processing and production fields of grains, foods, chemical industry, medicine, agricultural and sideline products, pasture and the like, materials need to be heated and dried; the hot-blast heat that cylinder drying-machine used is hot-blast through the heat exchanger heat transfer outside the equipment, perhaps need install the heated warehouses additional outside the dry storehouse of cylinder, and the barrel heat conduction heating in dry storehouse of cylinder is given to the heating bath, and heat energy just can use through the secondary heat transfer, and the heat exchange efficiency of heat energy is low, and the use of heat energy is disposable, and the rate of effective use of heat energy is low, and the required heat energy of stoving just increases a lot.

The heat energy used when materials in a roller drying bin of some roller dryers are dried is used for heating the roller body of the roller through media in the peripheral heating groove, the conversion efficiency of the heat energy on the roller body for heat conduction of the materials is low, the heat energy loss is large, and the heat conduction area of the roller body is small, so that the conduction speed of the heat energy is low. The drum dryer with the heating groove has the advantages of complex equipment structure, high manufacturing cost, high operation and maintenance cost and large occupied area of equipment.

The heat pipe type heat exchange device disclosed in chinese patent publication No. CN106322979A is composed of an outer wall, an inner wall, a heat dissipation vertical pipe, an air extraction opening, a feeding valve and a discharging valve. One end of the opening of the heat dissipation vertical pipe is welded on the opening of the inner wall. The reason that one end of each heat dissipation vertical pipe and an inner cavity between the inner wall and the outer wall are communicated and ventilated is that the bottom end of each heat dissipation vertical pipe and the inner wall are welded, fixed and sealed into a whole, hundreds of heat dissipation vertical pipes are arranged in the heat pipe type heat exchange device of the heat pipe type drying bin, welding processing indexes of welding joints of one ends of the hundreds of heat dissipation vertical pipes and the inner wall are required to be standard, but the welding quality problem is easily exposed, as long as one welding quality problem exists in the welding points of one end of the hundreds of heat dissipation vertical pipes and the inner shell, only one leaked welding point can generate leakage of heat conduction working media, the leakage maintenance is troublesome, and finally the whole heat pipe type vacuum drying machine is disabled and cannot be used.

The novel drum dryer that has now on the market carries out drying process to the material to reach the material of required water content standard. The heating pipe that cylinder drying storehouse used is the gravity heating pipe, and when the gravity heating pipe was vertical placing, the evaporation zone of heating pipe was at condensation section under last, and heat energy can only carry out the heat conduction heating through the face of the hot plate of heating pipe lower extreme. The heat conducting area of the plate surface of the heating plate of the lower end pipe head of the heating pipe is limited, the heating plate with small heat exchange area only inputs a small amount of heat, the heat conducting working medium influences the heat conducting heating of the heat conducting working medium in the pipe cavity due to the limited heating area, the total heated heat energy of the heat conducting working medium is insufficient, the heating pipe cannot output a large amount of heat energy, the material cannot obtain enough heat energy, and the material drying efficiency of the roller drying bin is influenced.

Disclosure of Invention

The invention aims to solve the problem of overcoming the defects in the prior art and provides a heat pipe type roller vacuum dryer.

In order to achieve the purpose, the invention is realized by the following technical scheme: the heat pipe type roller vacuum dryer comprises a roller drying bin, a roller path, a gear ring, a three-way joint device, an elbow joint device, a discharging device, a vacuum unit, a support, a riding wheel and a driving device.

The roller drying bin is provided with a bin inlet and a bin outlet.

The outer diameter of the roller drying bin is 600-2800 mm; the length of the roller drying bin is 1600-18000 mm.

The gear ring and the roller path are arranged on the cylinder body of the roller drying bin, and the gear ring and the roller path are fixedly connected with the cylinder body of the roller drying bin into a whole.

The riding wheel is fixedly arranged on the ground, and supports the roller path of the roller drying bin.

The driving device is an electric motor or a hydraulic motor. In order to improve the efficiency of the driving device, the driving device can be matched with a gearbox, therefore, the driving device can also be an electric motor and the gearbox, or a hydraulic motor and the gearbox.

The driving wheel of the driving device is meshed with and drives the wheel teeth of a gear ring on the fixed roller drying bin, and the gear ring drives the roller drying bin; the roller drying bin is driven by the driving device to rotate on the riding wheel.

The three-way joint device comprises a three-way pipe, a flange joint and a dynamic sealing device.

The three-way pipe is provided with a discharge hole, a feed inlet and an exhaust port.

The dynamic sealing device is fixed on the outer surface of the pipe head at the discharge port end of the three-way pipe; the flange joint is fixedly and hermetically connected with the pipe head at the discharge port end of the three-way pipe through a dynamic sealing device.

The dynamic sealing device is a mature product: 1. 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. 2. The dynamic sealing device is a magnetic fluid sealing device, and the magnetic fluid sealing of the magnetic fluid sealing device utilizes the response characteristic of the magnetic fluid 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 of the three-way joint device is fixedly and hermetically connected with the bin inlet of the roller drying bin into a whole; when the bin inlet of the roller drying bin rotates, the flange joint synchronously rotates along with the roller drying bin, and the three-way pipe is fixed; a dynamic seal with airtight seal is arranged between the flange joint and the pipe head of the discharge hole of the three-way pipe; the discharge port of the three-way pipe is fixedly connected with the inlet of the roller drying bin without air leakage.

The three-way pipe of the three-way joint device is fixedly supported by a bracket.

The discharging device is arranged on a feeding hole of a three-way pipe of the three-way joint device, and materials to be dried enter the roller drying bin through the discharging device; the discharging device conveys materials and simultaneously prohibits air outside the roller drying bin from entering the roller drying bin through the discharging device.

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

The vacuum unit is arranged on an exhaust port of a three-way pipe of the three-way joint device through an air duct. Moisture generated in the drying process of the materials in the roller drying bin is discharged out of the roller drying bin by a vacuum unit; moisture generated in the drying process of the materials in the roller drying bin sequentially passes through the exhaust port, and the air guide pipe is discharged out of the drying bin by the vacuum unit.

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 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 sets the vacuum degree corresponding to the vaporization boiling point according to the requirement of the material drying quality.

The elbow joint device comprises an elbow pipe, a flange joint and a dynamic sealing device.

The elbow pipe is provided with a discharge hole and a feed inlet.

The dynamic sealing device is fixed on the outside of the pipe head at the feed inlet end of the elbow pipe; the flange joint is fixedly and hermetically connected with the pipe head of the feeding hole of the elbow pipe by a dynamic sealing device.

The flange joint of the elbow joint device is fixedly and hermetically connected with the bin outlet of the roller drying bin into a whole; when the outlet of the roller drying bin rotates, the flange joint synchronously rotates along with the roller drying bin, and the elbow pipe is fixed; the flange joint is hermetically connected with the pipe head of the feeding hole of the elbow pipe by a dynamic sealing device, and the flange joint is hermetically and dynamically sealed; the inlet of the elbow pipe is fixedly connected with the outlet of the roller drying bin without air leakage.

The elbow pipe of the elbow joint device is supported and fixed by a bracket.

The discharging device is arranged on a discharging port of an elbow pipe of the elbow joint device, and the dried material in the roller drying bin is discharged out of the roller drying bin through the elbow joint device and the discharging device in sequence; the discharging device also prevents air outside the roller drying bin from entering the roller drying bin through the discharging device while conveying materials.

The roller drying bin comprises a heating device, a roller and a spiral blade.

The roller is provided with a bin inlet and a bin outlet; the inlet and outlet of the roller are also the inlet and outlet of the roller drying bin.

The helical blade is fixed on the cylinder body in the roller. The materials enter the roller through the bin inlet of the roller, and move forward from the bin inlet to the bin outlet under the propelling action of the helical blades.

The heating device is arranged in the chamber of the roller.

The diameter of the roller is 805-3520 mm, and the length of the roller is 3000-30000 mm.

The cylinder body of the roller is made of a metal plate, the thickness of the metal plate is 2-12 mm, and the metal plate is rolled, welded and processed to form the roller.

The diameter of the appearance of the heating device is 800-3500 mm, and the length is 3500-32000 mm. The heating device is spring-like in appearance.

The heating device comprises a heating pipe, a heat conduction pipe and a fixing strip.

The heat conduction pipe is made of metal, the heat conduction pipe is made through processing of the pipe bender, the heat conduction pipe is arranged in a spiral shape, and the appearance of the rolled heat conduction pipe is similar to that of a spring.

The heat conduction pipe is provided with a heat energy inlet and a heat energy outlet; the diameter of the heat conducting pipe is 48-128 mm, and the length is 5000-58000 mm; the length of the heat conducting pipe is set according to the actual requirement of the roller. The spiral diameter of the processed and manufactured spiral heat-conducting pipe is 800-3500 mm, and the spiral appearance length of the spiral heat-conducting pipe is 2500-28000 mm.

The outer surface of the tube body of the heat conduction tube of the heating device is attached to the tube body of the roller, the tube body supported by the heat conduction tube avoids the invagination deformation of the tube body of the roller caused by the vacuum negative pressure in the roller drying bin, and the tube body of the roller supported by the heat conduction tube improves the bending resistance of the tube body of the roller with a certain length; the cylinder body of the roller is supported by the heat conduction pipe, so that the pressure resistance is improved, and the thickness of the selected metal plate is reduced when the cylinder body is manufactured.

The lengths of the heating pipes arranged on the heat conduction pipes of the heating device are different. The circumference of heliciform heat pipe is long, selects the heating pipe of installing different length on the heat pipe, and the heating pipe of length cross arrangement is convenient for improve the heating pipe installation quantity on the heat pipe, and the heating pipe of length cross arrangement has improved the heat conduction heat transfer area of heating device's heat energy.

The lower end of the heating pipe is fixed on the heat conduction pipe; the heating pipe stands on the heat conduction pipe, and the lower end face of the heating pipe is attached and fixed on the heat conduction pipe. The heating pipe is a single one which is fixedly welded outside the heat conducting pipe; the distance between each heating pipe and the adjacent heating pipe is 60-180 mm, and the heating pipes with the required number can be welded and fixed on the heat conduction pipes.

The interior of the heating pipe is not communicated with the interior of the heat conducting pipe; when one heating pipe is damaged to generate leakage, only the heating pipe does not work, and the use of the integral roller is not influenced.

The heating pipes are fixedly connected with the adjacent heating pipes by the fixing strips, the firmness of the heating pipes supported by the fixing strips can be improved, and the heating pipes are prevented from falling down and tilting under the flowing extrusion of materials in the bin; the fixing strip is a 2-5 mm steel bar or a metal strip.

The diameter of the heating pipe is 38-118 mm, and the length is 300-1500 mm.

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

The metal tube is a metal tube with one closed end. The metal tube is a light tube or a finned metal tube.

The unsealed end of the metal tube and the heating end enclosure are fixedly welded into a whole, and the inner cavity of the tube after the metal tube and the heating end enclosure are welded and fixed is in a sealed airtight vacuum state; the heat conducting working medium is arranged in the vacuum pipe inner cavity after the metal pipe and the heating end socket are welded and fixed, and the heat conducting working medium conducts heat conducting and heat exchanging of liquid-vapor phase change in the pipe inner cavity after the metal pipe and the heating end socket are welded and fixed.

The heat conducting working medium is water, ethanol, a composite working medium or other working media suitable for use.

The diameter of the heating end socket is 35-98 mm, and the height is 38-580 mm.

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

The heat-conducting medium is water, ethanol, a composite medium or other suitable medium.

The heating plate is made of a 0.1-3 mm metal plate, and the metal plate is made into the heating plate through stamping of a stamping machine. The shape and size of the concave shape of the heating plate are equal to or larger than the shape and size of the periphery of the heat conduction pipe, and the shape and size of the concave shape of the heating plate are the same as the shape and size of the periphery of the heat conduction pipe.

The heating strip is arranged on the heater, and the heating strip and the heater are integrated. 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 by a punch through a heater die; the thickness of the metal plate is 0.1-1 mm.

The heating strip is hollow, and a hollow cavity is formed inside the heating strip; 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 in a sealed airtight vacuum state, and a heat-conducting medium is in the cavity between the heater and the heating plate. The inner cavity of the heating strip and the cavity between the heater and the heating plate are in communication. The heat conducting medium conducts heat conduction and heat exchange of liquid-vapor phase change in a cavity between the heater of the heating end socket and the heating plate.

The lower end of the heating pipe is fixed on the outside of the heat conducting pipe. Through electric welding, weld the junction of the heating head of heating pipe lower extreme and the body of heat pipe and fix, the lower extreme and the heat pipe of heating pipe are as an organic whole along fixed connection.

The heat energy inlet of the heat conduction pipe of the heating device extends out of the elbow pipe of the elbow joint device on the outlet of the roller drying bin, the joint of the heat conduction pipe of the heat energy inlet and the elbow pipe is fixedly and hermetically connected by a dynamic sealing device, when the outlet of the roller drying bin rotates, the heat conduction pipe synchronously rotates along with the roller drying bin, and the elbow pipe is fixed; the heat conducting pipe of the heat energy inlet and the elbow pipe are dynamically sealed in airtight mode, and the joint of the heat conducting pipe of the heat energy inlet and the elbow pipe is airtight.

The heat conduction pipe and the barrel body of the roller at the outlet of the roller drying bin are supported and fixed by the support frame, and the support frame improves the fixation and the non-shaking of the heat conduction pipe; the heat energy inlet of the heat conducting pipe is connected to an external heat source through a guide pipe, the guide pipe is provided with a circulating pump, and the circulating pump can improve the circulating flow speed of the heat conducting medium in the guide pipe and the heat conducting pipe, so that the heat conducting speed is increased. The heat energy inlet of the heat conducting pipe is fixedly connected with the guide pipe through a rotary joint. The pipe is fixed when the heat conducting pipe rotates, and the joint between the heat conducting pipe and the pipe connected by the rotary joint does not leak.

The heat energy outlet of the heat conducting pipe of the heating device extends out of a three-way pipe of a three-way joint device arranged on the bin inlet of the roller drying bin, and the joint of the heat conducting pipe and the three-way pipe is fixedly and hermetically connected by a dynamic sealing device. When the bin inlet of the roller drying bin rotates, the heat conduction pipe synchronously rotates along with the roller drying bin, and the three-way pipe is fixed; the heat conducting pipe and the three-way pipe are sealed airtight dynamic seal, and the joint of the heat conducting pipe and the three-way pipe is airtight. The heat conduction pipe and the barrel body of the roller at the inlet of the roller drying bin are supported and fixed by the support frame, and the support frame improves the fixation and the non-shaking of the heat conduction pipe; the heat energy outlet of the heat conducting pipe is connected with an external heat source through a conduit. The heat energy outlet of the heat conducting pipe is fixedly connected with the conduit by a rotary joint. The pipe is fixed when the heat conducting pipe rotates, and the joint between the heat conducting pipe and the pipe connected by the rotary joint does not leak.

The medium used in the heat conducting pipe in the heating device is not marked and shown in the attached drawings; the medium is water, or air, or heat conducting oil, or other suitable medium.

The heat source of the external device is a boiler, or a heat pump, or a burner, or a combustion furnace.

After the medium is heated by an external heat source, the medium carries heat energy to enter the heat conduction pipe; the heat energy carried by the medium in the heat conduction pipe conducts heat for the heating plate of the heating end enclosure through the pipe body of the heat conduction pipe, the heat energy conducted on the heating plate conducts heat for the heat conduction medium in the cavity between the heater of the heating end enclosure and the heating plate, and the heat conduction medium conducts heat conduction and heat exchange of liquid-vapor phase change inside the cavity between the heater and the heating plate. The hollow heating strip is convenient for the heat conducting medium to conduct heat energy at the hollow part of the heating strip, the vaporized gaseous heat conducting medium is filled in the cavity between the heater and the heating plate, and the heat energy carried by the heat conducting medium is conducted out through the heating strip.

Under the condition of the space volume of the inner cavity of the heating pipe 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, realizes that the heating plate of the heating end socket with small area can input enough heat energy, the heater with large area heat conduction and heat exchange of the heating end socket can output a large amount of heat energy, the heat energy conducted on the heater of the heating end socket can conduct heat conduction and heating for the heat conduction working medium in the pipe cavity, the heat conduction working medium in the pipe cavity is scattered around the heating strips on the heater, and the heating speed of the heat conduction working medium in the pipe cavity of the heating pipe is improved.

The liquid heat-conducting working medium in the tube cavity of the heating tube is vaporized after being heated by the heat conduction of the heat energy on the heater, the vaporized gas heat-conducting working medium moves in the tube cavity, after the gaseous heat-conducting working medium conducts heat outwards and dissipates heat through the metal pipe, the gaseous working medium is condensed into the liquid heat-conducting working medium, the condensed liquid heat-conducting working medium drops 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 in large area supplies heat energy to the heat-conducting working medium, the heating device of the small area heating plate can conduct heat energy to the heat-conducting working medium in the inner cavity of the pipe, the heat-conducting working medium conducts heat conduction and heat exchange of 'liquid-vapor phase change' in the inner cavity of the pipe, the vaporized gaseous heat-conducting working medium is filled in the, the heat energy carried by the heat-conducting working medium is conducted to the material outside the metal pipe through the metal pipe to conduct heat and heat. The metal tube can output a large amount of heat, the heat energy is conducted to the materials piled around the heating device, and the materials in the roller can be dried after obtaining the heat energy.

The boiling point temperature of the heat-conducting medium in the heating end socket is higher than that of the heat-conducting working medium in the pipe inner cavity of the heating pipe. And a heat-conducting medium with a higher boiling point is selected in the heating end socket, and a heat-conducting working medium with a lower boiling point is selected in the heating pipe. The high-temperature heat energy conducted by the heating end socket is convenient for conducting heat conduction and heating for the heat conduction working medium in the pipe inner cavity with low boiling point, and the vaporization heat conduction speed of the heat conduction working medium in the pipe inner cavity is increased.

The heating device is arranged in the roller, and the heating device synchronously rotates along with the roller in the rotating process of drying materials. The lower end of a heating pipe of the heating device continuously changes the upper position and the lower position along with the rotation of the roller, and a heating end socket of the heating pipe continuously changes the upper position and the lower position. When some heating pipes are arranged above the roller, heating end sockets of the heating pipes are arranged at the upper position of the roller, and when the heating end sockets of some heating pipes are arranged below the roller, the heating end sockets of the heating pipes are arranged at the lower position of the roller. Due to the working principle of the gravity heat pipe, when the heating end enclosure of the heating pipe faces downwards and is positioned below the roller, the heat conducting working medium in the pipe cavity of the heating pipe flows to the heating end enclosure below the heating pipe, heat energy in the heat conducting pipe conducts heat for the heating end enclosure of the heating pipe, and the heater of the heating end enclosure conducts heat for the heat conducting working medium in the pipe cavity.

When the material is in a constant-speed drying section and the moisture in the material is less than the critical moisture content, high-temperature heat energy is needed to improve the drying speed; the drying of the material in the drum at the outlet end by heating with heat energy has been somewhat time consuming and requires higher temperature heat energy for drying. The medium heated by the external heating source is the high-temperature medium, the heat energy carried by the high-temperature medium directly provides the fastest and most effective heat energy for drying the materials in the roller at the outlet end, and the temperature of the heat-dissipated medium is reduced after reaching the roller at the inlet end, so that the materials to be dried and wet can be heated and dried in a high-humidity manner. On the contrary, the heat energy inlet of the heat conducting pipe of the heating device is arranged at the inlet of the roller and enters the roller, the heat energy carried by the medium is conducted on the material in the roller at the outlet, the temperature of the heat-dissipated medium is reduced to the rear of the roller at the outlet, the heat energy provided for drying the material in the roller at the outlet is limited and insufficient, and the drying efficiency of the material is reduced. When the moisture in the material is less than the critical moisture content, the drying speed of the material is improved by the medium carrying high-temperature heat energy, and the heat energy inlet of the heat conduction pipe of the heating device enters the roller at the outlet of the roller, so that the optimal choice for improving the drying speed is provided.

Heat energy generated by a peripheral heat source directly enters the interior of the heating device of the roller drying bin for heat conduction and heat exchange, and heat energy can conduct heat for materials without secondary heat conduction and heat exchange, so that the effective utilization rate of heat energy is improved. The heating bin or the heating groove does not need to be additionally arranged outside the roller drying bin, the structure of the roller drying bin is simple, the manufacturing cost is low, and the utilization rate of the drying field is further improved.

The heat conduction heating work flow of the heating device of the roller drying bin is as follows: the heat energy carried by the medium in the heat conducting pipe of the heating device conducts heat for the heating end enclosure through the pipe body of the heat conducting pipe, the liquid heat conducting working medium in the pipe cavity of the heating pipe is vaporized after the heat conducting heating of the heat energy on the heating end enclosure heater, and the heat energy carried by the heat conducting working medium conducts heat for the material outside the pipe of the metal pipe through the metal pipe.

Firstly, after the medium is heated by an external heating source, the medium carrying heat energy enters the heat conduction pipe through a heat energy inlet of the heat conduction pipe. The medium used in the heat conduction pipe is heat conduction oil or water.

And secondly, heat energy carried by the medium in the heat conduction pipe is conducted and heated to the heating end socket of the heating pipe through heat conduction of the pipe body of the heat conduction pipe, the heat energy conducted on the heating plate is conducted and heated to the heat conduction medium in the cavity between the heater and the heating plate, and the heat conduction medium conducts heat conduction and heat exchange of liquid-vapor phase change in the cavity between the heater and the heating plate. The heat energy conducted on the heater conducts heat to the heat-conducting working medium in the tube cavity, and the heat energy carried by the heat-conducting medium provides heat energy to the liquid heat-conducting working medium in the tube cavity of the heating tube through the heating end socket.

Thirdly, the liquid heat-conducting working medium is quickly gasified by heat conducted by a heater of the heating end socket, the gasified heat-conducting working medium moves in the inner cavity of the heating pipe, the gasified heat-conducting working medium conducts heat outwards through the pipe body and the fins of the metal pipe and dissipates heat, the gasified heat-conducting working medium is condensed into the liquid heat-conducting working medium, the condensed liquid heat-conducting working medium flows to the heating head of the heating pipe and is gasified again after being heated, and the heat-conducting working medium conducts heat conduction and heat exchange in the inner cavity of the pipe through liquid-vapor phase change.

And fourthly, conducting heat energy carried by the heat conducting working medium to the materials around the heating device through conduction of the metal pipe and the fins to conduct heat conduction and heating, drying the materials to achieve the required water content standard.

And fifthly, the medium after heat conduction and heat dissipation is discharged out of the heat conduction pipe through a heat energy outlet of the heat conduction pipe, the medium is reheated through an external heating source and then enters the heat conduction pipe through a heat energy inlet of the heat conduction pipe, and the heat conduction medium circularly conducts heat, exchanges heat and heats repeatedly.

The working process of the vacuum drying of the materials of the heat pipe type roller vacuum dryer is as follows:

firstly, starting a driving device, and enabling a roller drying bin to rotate on a riding wheel under the driving of the driving device; the rotary speed of the roller drying bin controlled by the driving device is 5-30 revolutions per minute.

Secondly, start discharge apparatus, wait that dry material loops through discharge apparatus, three-way connection device's three-way pipe, the storehouse mouth that advances in the dry storehouse of cylinder enters into the storehouse in the dry storehouse of cylinder inside, and the material impels forward under helical blade's stirring pushing action, and the material advances to the flow of the delivery port department in the dry storehouse of cylinder by the storehouse mouth that advances in the dry storehouse of cylinder.

Thirdly, after the medium is heated by a heat source arranged outside, the heat energy carried by the medium is conducted and heated for the material in the roller drying bin by the heating device, the heat conduction pipe and the heating pipe of the heating device of the rotary roller drying bin are conducted and heated for the material, the material in the roller drying bin is heated by the heat energy, and the material reaches the material with the required water content standard after being dried and dried. The heating pipe and the heating pipe of the heating device in rotation form cross density, the heating pipe of the heating device in the rotary drum drying bin increases the heat conducting area of the material by 2-5 times, the heating pipe with high cross density of the heating device in rotation increases the collision contact rate and the heat conducting area with the material, and the heat conducting drying effect on the material is improved.

Fourthly, starting a vacuum unit, and pumping air in the roller drying bin 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 drying chamber is maintained at-0.095 to-0.045 Mpa.

And fifthly, discharging the dried materials under the rotating pushing action of the helical blades, wherein the dried materials sequentially pass through an elbow pipe of an elbow joint device on a bin outlet of a drying bin of the roller drying bin, and discharging the dried materials out of the drying bin by a discharging device.

The vacuum conduction drying energy consumption index of the heat pipe type roller vacuum dryer is 2800-3500 kj/kg water, and the air convection drying is 5500-8500 kj/kg water; the effective utilization rate of heat energy of the air convection drying is generally 20-50%, while the vacuum conduction drying can be close to 100% theoretically, because the vacuum conduction drying of the roller vacuum dryer does not need hot air to heat materials, and the heat loss lost by exhaust is small. In the constant-speed drying section, the boiling point of water is reduced due to vacuum or decompression, the temperature rise of the material is extremely small, the heat is almost completely used for evaporating water, and if the heat is close to or less than the critical water content, the energy-saving advantage of vacuum conduction drying of the heat pipe type roller vacuum dryer is higher.

Compared with the prior drum dryer, the invention has the following beneficial effects: a drum drying bin of a heat pipe type drum vacuum dryer rotates on a riding wheel under the driving of a driving device, heat energy carried by a medium conducts heat to materials in the drum through a heat pipe and a heating pipe of a heating device, the heat dissipation area of a heater with heating strips of a heating end socket is increased by 8-35 times, the heater of the heating end socket conducts heat energy to a heat conducting working medium, and the heat conducting working medium conducts heat conduction and heat exchange of liquid-vapor phase change in a pipe inner cavity. The heating pipe with high cross density of the rotary heating device increases the collision contact rate and the heat conduction area with the material, and increases the heat conduction drying effect on the material. Heating device still plays the effect of stirring the material when carrying out heat conduction heating for the material, and material drying quality in the cylinder is even, promotes material drying efficiency and optimizes material drying effect, green drying energy-concerving and environment-protective. When one heating pipe is damaged and leaks, the use of the whole roller is not influenced.

Drawings

FIG. 1 is a schematic structural view of a heat pipe type roller vacuum dryer according to the present invention;

FIG. 2 is a schematic structural diagram of a drum drying bin of the heat pipe type drum vacuum dryer according to the present invention;

FIG. 3 is a schematic structural diagram of a three-way joint device of the heat pipe type roller vacuum dryer of the present invention;

FIG. 4 is a schematic structural view of an elbow joint device of the heat pipe type roller vacuum dryer according to the present invention;

FIG. 5 is a schematic cross-sectional view of a heating apparatus of the heat pipe type drum vacuum dryer according to the present invention;

FIG. 6 is a schematic structural diagram of a heating device of the heat pipe type roller vacuum dryer according to the present invention;

FIG. 7 is a schematic structural diagram of a heating pipe of the heating device of the drum drying bin of the heat pipe type drum vacuum dryer according to the present invention;

fig. 8 is a schematic structural view of a heating end enclosure of a heating pipe of the heating device of the drum drying bin of the heat pipe type drum vacuum dryer of the present invention.

In the drawings: 1. the device comprises a roller drying bin, 2, a three-way joint device, 3, an elbow joint device, 4, a discharging device, 5, a vacuum unit, 6, a roller path, 7, a gear ring, 8, a support, 9, a riding wheel, 10, a driving device, 11, a bin inlet, 12, a bin outlet, 13, a heat energy inlet, 14, a heat energy outlet, 15, a heat pipe, 16, a roller, 17, a heating device, 18, a medium flow direction mark, 19, a flange joint, 20, a three-way pipe, 21, a discharge port, 22, a feed inlet, 23, an exhaust port, 24, a dynamic sealing device, 25, an elbow pipe, 26, a fixing strip, 27, a heating pipe, 28, a pipe body outer surface, 29, a barrel body, 30, a pipe inner cavity, 31, a metal pipe, 32, a heat conducting working medium, 33, a heating end socket, 34, a heater, 35, a heating plate, 36, a heating strip.

The specific implementation mode is as follows:

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

Example (b):

the heat pipe type roller vacuum dryer shown in fig. 1 comprises a roller drying bin 1, a roller path 6, a gear ring 7, a three-way joint device 2, an elbow joint device 3, a discharging device 4, a vacuum unit 5, a support 8, a riding wheel 9 and a driving device 10.

The roller drying bin 1 is provided with a bin inlet 11 and a bin outlet 12.

The outer diameter of the roller drying bin 1 is 1800 mm; the length of the drum drying silo 1 is 8000 mm.

The gear ring 7, the roller path 6 and the cylinder 29 of the roller drying bin 1 are connected and fixed into a whole; the riding wheel 9 supports the roller path 6 of the roller drying bin 1.

The drive means 10 is a hydraulic motor.

Under the driving action of the driving device 10, the roller drying bin 1 rotates on the riding wheel 9.

As shown in figures 1, 2 and 3, the three-way joint device 2 comprises a tee 20, a flange joint 19 and a dynamic sealing device 24.

The three-way pipe 20 is provided with a discharge port 21, a feed port 22 and an exhaust port 23.

The dynamic sealing device 24 is fixed on the outer surface of the pipe head at the discharge port 21 end of the three-way pipe 20; the flange joint 19 and the pipe head at the discharge port 21 end of the three-way pipe 20 are fixedly and hermetically connected by a dynamic sealing device 24.

The flange joint 19 of the three-way joint device 2 is fixedly and hermetically connected with the bin inlet 11 of the roller drying bin 1 into a whole; when the bin inlet 11 of the roller drying bin 1 rotates, the flange joint 19 synchronously rotates along with the roller drying bin 1, and the three-way pipe 20 is fixed; the tee 20 of the tee fitting 2 is fixedly supported by the bracket 8.

The discharging device 4 is arranged on the feed inlet 22 of the three-way pipe 20 of the three-way joint device 2.

The discharging device 4 is an air seal machine.

The vacuum unit 5 is arranged on an exhaust port 23 of the three-way pipe 20 of the three-way joint device 2 through an air guide pipe. Moisture generated in the drying process of the materials in the roller drying bin 1 is discharged out of the roller drying bin 1 by a vacuum unit 5.

The vacuum unit 5 comprises a dust filtering device, a condenser and a vacuum pump.

The dust in the moisture generated when the air and the materials in the 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 1 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 elbow joint device 3 shown in figures 1, 2 and 4 comprises an elbow pipe 25, a flange joint 19 and a dynamic sealing device 24.

The elbow pipe 25 is provided with a discharge port 21 and a feed port 22.

The dynamic sealing device 24 is fixed on the outer surface of the pipe head at the feed inlet 22 end of the elbow pipe 25; the flange joint 19 and the head of the feed inlet 22 of the elbow pipe 25 are fixedly and hermetically connected by a dynamic sealing device 24.

The flange joint 19 of the elbow joint device 3 is fixedly and hermetically connected with the bin outlet 12 of the roller drying bin 1 into a whole; when the outlet 12 of the roller drying bin 1 rotates, the flange joint 19 is hermetically connected with the pipe head of the feed inlet 22 of the elbow pipe 25 through the dynamic sealing device 24, and the flange joint 19 is hermetically sealed and airtight dynamic sealing is formed between the pipe head of the feed inlet 22 of the elbow pipe 25 and the pipe head of the flange joint 19; the fixed connection of the inlet opening 22 of the elbow pipe 25 and the outlet opening 12 of the drum drying chamber 1 is airtight.

The elbow pipe 25 of the elbow joint device 3 is supported and fixed by the bracket 8.

The discharging device 4 is arranged on a discharging port 21 of an elbow pipe 25 of the elbow joint device 3, and the dried materials in the roller drying bin 1 are discharged out of the roller drying bin 1 through the elbow joint device 3 and the discharging device 4 in sequence.

As shown in fig. 1, 2 and 6, the drum drying bin 1 comprises a heating device 17, a drum 16 and a spiral blade.

The roller 16 is provided with a bin inlet 11 and a bin outlet 12.

The helical blades are fixed on a cylinder 29 in the roller 16; the materials enter the roller 16 through the bin inlet 11 of the roller 16, and the materials move forward from the bin inlet 11 to the bin outlet 12 under the propelling action of the helical blades.

The heating device 17 is arranged in the bin of the roller 16.

As shown in fig. 2, 5, 6, 7 and 8, the heating device 17 includes a heating pipe 27, a heat conducting pipe 15 and a fixing strip 26.

The heat conducting pipe 15 has a thermal energy inlet 13 and a thermal energy outlet 14.

The outer surface 28 of the heat pipe 15 of the heating device 17 is adhered to the cylinder 29 of the roller 16.

The lengths of the heating pipes 27 mounted on the heat conduction pipes 15 of the heating device 17 are different; the heating tube 27 has a length of 300mm and 600 mm.

The lower end of the heating pipe 27 is fixed on the heat conducting pipe 15, and the heating pipe 27 and the adjacent heating pipe 27 are fixedly connected by a fixing strip 26.

Referring to fig. 7, the heating pipe 27 shown in fig. 8 includes a metal pipe 31, a heat conducting working medium 32, and a heating end enclosure 33.

The metal tube 31 is a metal tube with one closed end; the metal tube 31 is a metal tube having fins on the tube body.

The unsealed end of the metal pipe 31 and the heating end enclosure 33 are fixedly welded into a whole; the heat conducting working medium 32 is arranged in the vacuum pipe inner cavity 30 after the metal pipe 31 and the heating end enclosure 33 are welded and fixed; the heat conducting working medium 32 conducts heat conducting and exchanging of liquid-vapor phase change in the pipe inner cavity 30 after the metal pipe 31 and the heating end enclosure 33 are welded and fixed.

The heat conducting working medium 32 is ethanol.

Referring to fig. 7, the heating head 33 shown in fig. 8 includes a heating plate 35, a heat transfer medium 37, and a heater 34.

The heater 34 is provided with a heating strip 36, and the heating strip 36 and the heater 34 are integrated.

The heating strip 36 is hollow, and the interior of the heating strip 36 is a hollow cavity.

The lower end of the heater 34 is fixed on the heating plate 35, and the heat transfer medium 37 is in the cavity between the heater 34 and the heating plate 35. The interior of the heating strip 36 is in communication with the cavity between the heater 34 and the heating plate 35. The heat conducting medium 37 conducts heat conduction and heat exchange of liquid-vapor phase change in a cavity between the heater 34 and the heating plate 35 of the heating end enclosure 33.

The heat transfer medium 37 is water.

As shown in fig. 1, fig. 2, fig. 4, and fig. 6, the heat energy inlet 13 of the heat conducting pipe 15 of the heating device 17 extends out of the elbow pipe 25 of the elbow joint device 3 on the outlet 12 of the drum drying bin 1, and the connection between the heat conducting pipe 15 and the elbow pipe 25 is fixedly and hermetically connected by the dynamic sealing device 24. When the outlet 12 of the roller drying bin 1 rotates, the heat conduction pipe 15 synchronously rotates along with the roller drying bin 1, and the elbow pipe 25 is fixed; the heat conducting pipe 15 of the heat energy inlet 13 and the elbow pipe 25 are sealed and airtight dynamic seal, and the joint of the heat conducting pipe 15 of the heat energy inlet 13 and the elbow pipe 25 is airtight. The heat conduction pipe 15 and the cylinder 29 of the roller 16 at the outlet 12 of the roller drying bin 1 are supported and fixed by a support frame, and the support frame improves the fixation of the heat conduction pipe 15 and prevents the heat conduction pipe from shaking; the heat energy inlet 13 of the heat conducting pipe 15 is connected to an external heat source through a conduit, and a circulating pump is installed on the conduit, and the circulating pump can increase the circulating flow speed of the heat conducting medium 37 in the conduit and the heat conducting pipe 15, so that the heat conducting speed is increased. The connection of the heat energy inlet 13 of the heat conducting pipe 15 and the conduit is fixedly connected by a rotary joint. The pipe is fixed when the heat conductive pipe 15 rotates, and the joint between the heat conductive pipe 15 and the pipe connected by the rotary joint does not leak.

As shown in fig. 1, fig. 2, fig. 3 and fig. 6, the thermal energy outlet 14 of the heat conducting pipe 15 of the heating device 17 extends out of the tee pipe 20 of the tee joint device 2 installed on the bin inlet 11 of the drum drying bin 1, and the connection position of the heat conducting pipe 15 and the tee pipe 20 is fixedly and hermetically connected by a dynamic sealing device 24. When the bin inlet 11 of the roller drying bin 1 rotates, the heat conduction pipe 15 synchronously rotates along with the roller drying bin 1, and the three-way pipe 20 is fixed; the dynamic seal is airtight between the heat conducting pipe 15 and the three-way pipe 20, and the joint of the heat conducting pipe 15 and the three-way pipe 20 is airtight. The heat conduction pipe 15 and the cylinder 29 of the roller 16 at the inlet 11 of the roller drying bin 1 are supported and fixed by a support frame, and the support frame improves the fixation of the heat conduction pipe 15 and prevents the heat conduction pipe from shaking; the heat energy outlet 14 of the heat conduction pipe 15 is connected to an external heat source through a pipe. The connection of the heat energy outlet 14 of the heat conducting pipe 15 and the conduit is fixedly connected by a rotary joint. The pipe is fixed when the heat conductive pipe 15 rotates, and the joint between the heat conductive pipe 15 and the pipe connected by the rotary joint does not leak.

After the medium is heated by the external heat source, the medium carries heat energy into the heat conduction pipe 15 as shown by the medium flow direction mark 18; the heat energy carried by the medium in the heat pipe 15 conducts heat to the heating plate 35 of the heating end enclosure 33 through the pipe body of the heat pipe 15, the heat energy conducted on the heating plate 35 conducts heat to the heat-conducting medium 37 in the cavity between the heater 34 of the heating end enclosure 33 and the heating plate 35, and the heat-conducting medium 37 conducts heat conduction and heat exchange of liquid-vapor phase change in the cavity between the heater 34 and the heating plate 35. The hollow heating strips 36 facilitate the heat conducting movement of the heat conducting medium 37 in the hollow parts of the heating strips 36, the vaporized gaseous heat conducting medium 37 fills the cavity between the heater 34 and the heating plate 35, and the heat energy carried by the heat conducting medium 37 is conducted out through the heating strips 36.

The boiling point temperature of the heat conducting medium 37 in the heating end socket 33 is higher than the boiling point temperature of the heat conducting working medium 32 in the pipe inner cavity 30 of the heating pipe 27. The boiling point temperature of the heat conducting medium 37 used in the heating end socket 33 is higher than that of the heat conducting working medium 32 used in the pipe inner cavity 30 of the heating pipe 27.

When the moisture in the material is less than the critical moisture content, the drying speed of the material is increased by the medium carrying high-temperature heat energy, and the arrangement that the heat energy inlet 13 of the heat conduction pipe 15 of the heating device 17 enters the roller 16 at the outlet 12 of the roller 16 is the best choice for increasing the drying speed.

The working process of the vacuum drying of the materials of the heat pipe type roller vacuum dryer is as follows:

firstly, starting a driving device 10, and driving the roller drying bin 1 to rotate on a riding wheel 9 under the driving of the driving device 10; the rotation speed of the drum drying silo 1 controlled by the driving device 10 is 8 revolutions per minute.

Secondly, start discharge apparatus 4, wait that dry material loops through discharge apparatus 4, three-way connection device 2's three-way pipe 20, the storehouse mouth 11 of dry storehouse of cylinder enters into the storehouse of dry storehouse of cylinder 1 inside, and the material impels forward under helical blade's stirring pushing action, and the material advances to the play storehouse mouth 12 department flow of dry storehouse of cylinder 1 by the storehouse mouth 11 department of dry storehouse of cylinder 1.

Thirdly, after the medium is heated by an external heat source, the heat energy carried by the medium is conducted and heated for the material in the drum drying bin 1 through the heating device 17, the heat energy carried by the medium in the heat conduction pipe 15 of the heating device 17 is conducted and heated for the heating end enclosure 33 through the pipe body of the heat conduction pipe 15, the liquid heat-conducting working medium 32 in the pipe inner cavity 30 of the heating pipe 27 is vaporized after being heated through the heat conduction of the heat energy on the heating end enclosure 33 heater 34, and the heat energy carried by the heat-conducting working medium 32 is conducted for the material outside the pipe of the metal pipe 31 through the metal pipe 31 to be conducted and heated. The heat pipe 15 and the heating pipe 27 of the heating device 17 of the rotary drum drying bin 1 conduct heat conduction and heating on the materials, the materials in the drum drying bin 1 are heated by heat energy, and after the materials are dried and dried, the materials reach the required water content standard. The cross density is formed between the heating pipe 27 and the heating pipe 27 of the heating device 17 in rotation, the heating pipe 27 of the heating device 17 in the rotary drum drying bin 1 increases the heat conducting area of the material by 3 times, the heating pipe 27 with high cross density of the heating device 17 in rotation increases the collision contact rate and the heat conducting area with the material, and the heat conducting and drying effect on the material is increased.

Fourthly, starting the vacuum unit 5, and pumping air in the roller drying bin 1 and moisture generated during material drying by the vacuum unit 5; 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 vacuum pump drainage dry storehouse 1. The relative pressure in the drying chamber was maintained at-0.080 MPa.

And fifthly, discharging the dried materials under the rotating pushing action of the helical blades, wherein the dried materials sequentially pass through the elbow pipe 25 of the elbow joint device 3 on the outlet 12 of the drying bin of the roller drying bin 1, and the discharging device 4 discharges the dried materials out of the drying bin.

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. A heat pipe type roller vacuum dryer comprises a roller drying bin (1), a three-way joint device (2), an elbow joint device (3), a discharging device (4), a vacuum unit (5), a roller path (6), a gear ring (7), a bracket (8), a riding wheel (9) and a driving device (10); the method is characterized in that: the roller drying bin (1) is provided with a bin inlet (11) and a bin outlet (12);

the gear ring (7), the roller path (6) and the cylinder body (29) of the roller drying bin (1) are fixedly connected into a whole, and the roller path (6) of the roller drying bin (1) is supported by the supporting wheel (9); the roller drying bin (1) is driven by a driving device (10) to rotate on a riding wheel (9);

the three-way joint device (2) comprises a three-way pipe (20), a flange joint (19) and a dynamic sealing device (24); the three-way pipe (20) is provided with a discharge hole (21), a feed hole (22) and an exhaust port (23); the flange joint (19) is fixedly and hermetically connected with a pipe head at the discharge port (21) end of the three-way pipe (20) through a dynamic sealing device (24); the discharging device (4) is arranged on a feed inlet (22) of a three-way pipe (20) of the three-way joint device (2); the vacuum unit (5) is arranged on an exhaust port (23) of a three-way pipe (20) of the three-way joint device (2) through an air duct;

a flange joint (19) of the three-way joint device (2) is fixedly and hermetically connected with a bin inlet (11) of the roller drying bin (1) into a whole, and a three-way pipe (20) of the three-way joint device (2) is fixedly supported by a bracket (8);

the elbow joint device (3) comprises an elbow pipe (25), a flange joint (19) and a dynamic sealing device (24); the elbow pipe (25) is provided with a discharge hole (21) and a feed hole (22); the flange joint (19) is fixedly and hermetically connected with the head of the feed inlet (22) of the elbow pipe (25) through a dynamic sealing device (24); the discharging device (4) is arranged on a discharge hole (21) of an elbow pipe (25) of the elbow joint device (3);

the flange joint (19) of the elbow joint device (3) is fixedly and hermetically connected with the bin outlet (12) of the roller drying bin (1) into a whole; an elbow pipe (25) of the elbow joint device (3) is supported and fixed by a bracket (8);

the roller drying bin (1) comprises a heating device (17), a roller (16) and a helical blade; the helical blade is fixed on a cylinder body (29) in the roller (16); the heating device (17) is arranged in the bin of the roller (16);

the heating device (17) comprises a heating pipe (27), a heat conduction pipe (15) and a fixing strip (26); the lower ends of the heating pipes (27) are fixed on the heat conduction pipes (15), and the heating pipes (27) are fixedly connected with the adjacent heating pipes (27) through fixing strips (26);

the heating pipe (27) comprises a metal pipe (31), a heat conducting working medium (32) and a heating end enclosure (33); the unclosed end of the metal pipe (31) and the heating end enclosure (33) are fixedly welded into a whole, and heat conduction and heat exchange of liquid-vapor phase change are carried out on the heat conduction working medium (32) in the pipe inner cavity (30) after the metal pipe (31) and the heating end enclosure (33) are welded and fixed;

the heating end socket (33) comprises a heating plate (35), a heat-conducting medium (37) and a heater (34); a heating strip (36) is arranged on the heater (34); the lower end of the heater (34) is fixed on the heating plate (35), and the heat conducting medium (37) conducts heat conduction and heat exchange of 'liquid-vapor phase change' in a cavity between the heater (34) of the heating end enclosure (33) and the heating plate (35);

the boiling point temperature of the heat-conducting medium (37) in the heating end socket (33) is higher than that of the heat-conducting working medium (32) in the pipe inner cavity (30) of the heating pipe (27);

a heat energy inlet (13) of a heat conduction pipe (15) of the heating device (17) extends out of an elbow pipe (25) of the elbow joint device (3) on the bin outlet (12) of the roller drying bin (1), and the connection part of the heat conduction pipe (15) and the elbow pipe (25) is fixedly and hermetically connected by a dynamic sealing device (24); a heat energy outlet (14) of the heat conduction pipe (15) extends out of a three-way pipe (20) of a three-way joint device (2) arranged on a bin inlet (11) of the roller drying bin (1), and the connection part of the heat conduction pipe (15) and the three-way pipe (20) is fixedly and hermetically connected by a dynamic sealing device (24);

the materials to be dried sequentially pass through the discharge device (4), the three-way pipe (20) of the three-way joint device (2) and the bin inlet (11) of the roller drying bin (1) to enter the bin of the roller drying bin (1);

heat energy carried by a medium in a heat conduction pipe (15) of the heating device (17) conducts heat to the heating end enclosure (33) through a pipe body of the heat conduction pipe (15), a liquid heat conduction working medium (32) in a pipe inner cavity (30) of the heating pipe (27) is vaporized after being heated through heat conduction of the heat energy on a heater (34) of the heating end enclosure (33), and the heat energy carried by the heat conduction working medium (32) is conducted to a material outside the pipe of the metal pipe (31) through the metal pipe (31) to conduct heat;

the vacuum unit (5) pumps air in the roller drying bin (1) and moisture generated during material drying;

the dried materials sequentially pass through an elbow pipe (25) of an elbow joint device (3) on a bin outlet (12) of a drying bin of the roller drying bin (1), and the discharging device (4) discharges the materials out of the drying bin.

2. The heat pipe type drum vacuum dryer according to claim 1, wherein: the outer diameter of the roller drying bin (1) is 600-2800 mm; the length of the roller drying bin (1) is 1600-18000 mm.

3. The heat pipe type drum vacuum dryer according to claim 1, wherein: the drive device (10) is an electric motor or a hydraulic motor.

4. The heat pipe type drum vacuum dryer according to claim 1, wherein: the discharging device (4) is an air seal or a discharging valve.

5. The heat pipe type drum vacuum dryer according to claim 1, wherein: the vacuum unit (5) comprises a dust filtering device, a condenser and a vacuum pump.

6. The heat pipe type drum vacuum dryer according to claim 1, wherein: the lengths of the heating pipes (27) attached to the heat transfer pipes (15) of the heating device (17) are different.

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