CN105486053A - Heat pipe vacuum drying bin - Google Patents
Heat pipe vacuum drying bin Download PDFInfo
- Publication number
- CN105486053A CN105486053A CN201511026119.7A CN201511026119A CN105486053A CN 105486053 A CN105486053 A CN 105486053A CN 201511026119 A CN201511026119 A CN 201511026119A CN 105486053 A CN105486053 A CN 105486053A
- Authority
- CN
- China
- Prior art keywords
- heat
- tube
- dryness storehouse
- shell
- vacuum dryness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/12—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in stationary drums or other mainly-closed receptacles with moving stirring devices
- F26B11/14—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in stationary drums or other mainly-closed receptacles with moving stirring devices the stirring device moving in a horizontal or slightly-inclined plane
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/04—Agitating, stirring, or scraping devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
- F26B25/14—Chambers, containers, receptacles of simple construction
- F26B25/16—Chambers, containers, receptacles of simple construction mainly closed, e.g. drum
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a heat pipe vacuum drying bin. The vacuum drying bin is composed of a shell, an inner bin, high-airtight discharging devices, an air guide pipe and heat conduction working media. The heat pipe vacuum drying bin is in a cylindrical shape, and the two ends of the heat pipe vacuum drying bin are conical; and the shell is arranged outside the inner bin, and an inner cavity between the shell and the inner bin is filled with the heat conduction working media. The inner bin is composed of a bin body, heat dissipation pipes and spiral blades; the high-aright discharging devices are arranged on a feeding opening and a discharging opening in the two ends of the inner bin, and the air guide pipe is arranged on the high-aright discharging devices. The heat conduction working media are heated through heat energy to be subjected to phase change gasification, and the gasified working media carry out heat guide and exchange through the bin body and the heat dissipation pipes, and therefore the heat exchange area is increased, the heat exchange and guide speed is increased, the use efficiency of heat energy is high, and the aim of rapidly drying materials is achieved; and the drying bin with the high-aright discharging devices can achieve continuous vacuum low-temperature drying, the heat dissipating pipes and the spiral blades have a stirring function, wet materials are not prone to agglomeration, and the drying quality of the materials is improved.
Description
Technical field
What the present invention relates to is a kind of dryness storehouse, the heat-tube vacuum dryness storehouse specifically on a kind of drying equipment.
Background technology
In the processing field such as present grain, food, chemical industry, medicine, agricultural byproducts, herbage, need to carry out heat drying process to material under vacuum; The now dryness storehouse heat exchange of vacuum dryer commercially carries out heat exchange heat radiation mainly with calandria heat radiation, interlayer mode of heating, but their radiator volume is large, area of dissipation is little, heat energy service efficiency is low.Wet stock often forms caking under vacuum conditions, causes the uneven drying of wet stock, affects the oven dry quality of material.
Hot pipe technique is the heat transfer element that the one of the G.M.Grover invention of LosAlamos National Laboratory of the U.S. in 1963 is called " heat pipe ", it takes full advantage of the Rapid Thermal hereditary property of heat-conduction principle and refrigeration filling, through heat pipe, the heat of thermal objects is delivered to rapidly outside thermal source, inside heat pipe is by vapour, the liquid phase-change heat transfer of hydraulic fluid, thermal resistance is very little, Natural Circulation heat conduction, therefore has the very high capacity of heat transmission, and its capacity of heat transmission exceedes the capacity of heat transmission of any known metal.
The patented product rotary type vacuum heat conduction heat-exchanger rig of my application, rotary type vacuum heat conduction heat-exchanger rig is made up of shell, inner casing, side plate, lid and heat-conducting work medium.The side plate of shell, inner casing and both sides is welded seals, and shell is in the outside of inner casing, and the inner chamber between shell and inner casing is sealing, is filled with heat-conducting work medium in the inner chamber between shell and inner casing.There is mouth above one end side plate of rotary type vacuum heat conduction heat-exchanger rig, above mouth, have lid.The inwall of inner casing there are radiating tube, helical blade.Rotary type vacuum heat conduction heat-exchanger rig is merely able in batches dry oven dry, can not continuity vacuum drying material, so need to do further improvement to rotary type vacuum heat conduction heat-exchanger rig.
Summary of the invention
The problem to be solved in the present invention is the deficiency overcoming prior art existence, further improvement is done on patent " the rotary type vacuum heat conduction heat-exchanger rig " basis of my application, provide a kind of heat-tube vacuum dryness storehouse, the feed inlet and outlet changing storehouse in dry vacuum container is two feed inlet and outlets, and changing lid is high airtight device for discharging; There is the heat-tube vacuum dryness storehouse of high airtight device for discharging, successional vacuum dehydrating at lower temperature can have been realized.
In order to arrive above-mentioned purpose, the present invention is achieved through the following technical solutions: a kind of heat-tube vacuum dryness storehouse is by shell, and interior storehouse, high airtight device for discharging, wireway and heat-conducting work medium form.
The face shaping of described heat-tube vacuum dryness storehouse is cylindric.
1, the two ends of heat-tube vacuum dryness storehouse are tapers.
2, there is feed inlet and outlet at the two ends of heat-tube vacuum dryness storehouse.
3, the diameter of heat-tube vacuum dryness storehouse is 800-3500mm; The length of heat-tube vacuum dryness storehouse is 1000-25000mm.
It is metallic plate that described shell makes material, and the thickness of metallic plate is 0.5-8mm.
Described shell is in the outside in interior storehouse, and interior storehouse is in the inside of shell.
1, the inner chamber between shell and interior storehouse is closed gastight.
2, the inner chamber spacing between shell and interior storehouse is 5-150mm.
3, when the length of heat-tube vacuum dryness storehouse is more than 1500mm, the connection between shell and interior storehouse can be fixedly connected with by support.
4, in order to reduce the loss of heat energy, adhering in enclosure and installing heat-insulation layer additional to be incubated.
Corresponding appropriate heat-conducting work medium is had in inner chamber between described shell and interior storehouse.
Air pressure in inner chamber between described shell and interior storehouse requires according to the difference of gasification temperature the negative pressure pressure that setting is different, after the gasification vapo(u)rous degree in design con-trol inner chamber, adds corresponding, appropriate heat-conducting work medium.
Described interior storehouse is made up of warehouse, radiating tube and helical blade.
The making material of described warehouse is metallic plate, and the thickness of metallic plate is 0.5-8mm.
The feed inlet and outlet at described Nei Cang two ends is installed with high airtight device for discharging.
The airtight device for discharging of described height is airlock, or wind stopping device, or discharge gate.
Wireway is had above the airtight device for discharging of described height.
1, wireway is used to connect vacuum pump set, and vacuum pump set can by the gas in storehouse in wireway pump drainage.
2, wireway will seal fixing by the joint portion of high airtight device for discharging, gas leakage of can not losing heart.
Described helical blade is weldingly fixed on warehouse, and helical blade can stir material, discharging.
1, the making material of helical blade is metallic plate.
2, the height of helical blade is 50-500mm, and the thickness of helical blade is 1-10mm, and the length of helical blade is 3000-35000mm.。
3, the quantity of helical blade is 1-6 bar.
4, the layout of helical blade on warehouse is around shape; Or stringer shape.
The upper and lower correspondence of described warehouse has aperture, and the diameter in aperture is the same with the pipe diameter of radiating tube; Aperture on warehouse and the spacing in aperture are 50-200mm.
The two ends of described radiating tube are inserted in the corresponding aperture on warehouse; Be welded as a whole by binding site on radiating tube and warehouse, the binding site of radiating tube and warehouse is firmly airtight.
1, the two ends of radiating tube and the inner chamber between shell and interior storehouse are through ventilative.
2, the tube pitch of radiating tube and radiating tube is 50-200mm.
3, the pipe of radiating tube is the metal tube that both ends open is ventilative.
Described radiating tube is light pipe, or pipe has fin.
The height of the fin 1, on radiating tube is 5-50mm, and the thickness of fin is 0.5-3mm, and the spacing of fin and fin is 18-80mm.
2, the fin on radiating tube and the combination of pipe are fixed as one.
The connection form of the fin 3, on radiating tube and pipe is longitudinal shape, or around shape.
The present invention has following beneficial effect with existing dryness storehouse ratio: a kind of heat radiation of heat-tube vacuum dryness storehouse is that inwall solid is dispelled the heat; When the space of formed objects, volume, its heat exchange area increases 12-60 doubly, heat-conducting work medium is subject to energy heats and phase transformation is vaporized, the warehouse of heat-conducting work medium in interior storehouse of vaporization and radiating tube carry out heat conduction heat exchange, the heat exchange area increased improves the heat exchange heat-transfer rate of heat energy, heat energy service efficiency is high, strengthens dry materials efficiency, reaches the drying purpose of Quick material; The dryness storehouse installing high airtight device for discharging can realize successional vacuum dehydrating at lower temperature, and radiating tube and helical blade possess agitating function, and under the state of vacuum drying, wet stock prevented from caking, improves the dry mass of material.
Accompanying drawing illustrates:
Fig. 1, structural representation for heat-tube vacuum dryness storehouse of the present invention;
Fig. 2, structural representation for the helical blade of heat-tube vacuum dryness storehouse of the present invention.
Detailed description of the invention:
Below in conjunction with drawings and Examples, the present invention is described further.
Embodiment:
Heat-tube vacuum dryness storehouse is as shown in Figure 1 by shell (1), and interior storehouse (2), high airtight device for discharging (3), wireway (4) and heat-conducting work medium (6) form.
The face shaping of described heat-tube vacuum dryness storehouse is cylindric.
1, the two ends of heat-tube vacuum dryness storehouse are tapers.
2, there is feed inlet and outlet (9) at the two ends of heat-tube vacuum dryness storehouse.
3, the diameter of heat-tube vacuum dryness storehouse is 1500mm; The length of heat-tube vacuum dryness storehouse is 15000mm.
It is metallic plate that described shell (1) makes material, and the thickness of metallic plate is 2mm.
Described shell (1) is in the outside of Nei Cang (2), and interior storehouse (2) are in the inside of shell (1).
1, the inner chamber between shell (1) and interior storehouse (2) is closed gastight.
2, the inner chamber spacing between shell (1) and interior storehouse (2) is 80mm.
3, be fixedly connected with by support between shell (1) and interior storehouse (2).
4, shell (1) outside adheres to and installs heat-insulation layer additional to be incubated.
Corresponding appropriate heat-conducting work medium (6) is had in inner chamber between described shell (1) and interior storehouse (2).
Described heat-conducting work medium (6) requires according to the difference of gasification temperature the negative pressure pressure that setting is different according to the air pressure in the inner chamber between shell (1) and interior storehouse (2), after the gasification vapo(u)rous degree in design con-trol inner chamber, add corresponding, appropriate heat-conducting work medium (6).
Interior storehouse (2) is as shown in Figure 1 and Figure 2 made up of warehouse (7), radiating tube (5) and helical blade (8).
The making material of the warehouse (7) in described interior storehouse (2) is metallic plate, and the thickness of metallic plate is 2mm.
The feed inlet and outlet (9) at described interior storehouse (2) two ends is installed with high airtight device for discharging (3) above.
The airtight device for discharging of described height (3) is airlock.
The airtight device for discharging of described height (3) has wireway (4) above.
1, vacuum pump set carrys out the gas in storehouse in pump drainage (2) by wireway (4).
2, wireway (4) will seal fixing by the joint portion of high airtight device for discharging (3).
Described helical blade (8) is weldingly fixed on warehouse (7).
1, the making material of helical blade (8) is metallic plate.
2, the height of helical blade (8) is 300mm, and the thickness of helical blade (8) is 2mm, and the length of helical blade (8) is 18000mm.。
3, the quantity of helical blade (8) is 2.
4, the layout of helical blade (8) on the warehouse (7) of Nei Cang (2) is around shape.
Described warehouse (7) up and down correspondence has aperture, and the diameter in aperture is the same with the pipe diameter of radiating tube (5); Aperture on warehouse (8) and the spacing in aperture are 100mm.
The two ends of described radiating tube (5) are inserted in the corresponding aperture on warehouse (7).
Binding site on described radiating tube (5) and warehouse (7) is welded as a whole, and the binding site of radiating tube (5) and warehouse (7) is firmly airtight.
1, the two ends of radiating tube (5) and the inner chamber between shell (1) and interior storehouse (2) are through ventilative.
2, the tube pitch of radiating tube (5) and radiating tube (5) is 100mm.
3, the pipe of radiating tube (5) is the metal tube that both ends open is ventilative.
The pipe of described radiating tube (5) there is fin.
The height of the fin 1, on radiating tube (5) is 30mm, and the thickness of fin is 1mm, and the spacing of fin and fin is 50mm.
2, the fin on radiating tube (5) and the combination of pipe are fixed as one.
3, the fin on radiating tube (5) and the connection form of pipe are around shape.
Above embodiment just understands preparation method of the present invention and core concept thereof for helping; concrete enforcement is not limited to above-mentioned concrete embodiment, those skilled in the art from above-mentioned design, without performing creative labour; done change, all drops on protection scope of the present invention.
Claims (10)
1. a heat-tube vacuum dryness storehouse, is characterized in that: heat-tube vacuum dryness storehouse by shell (1), interior storehouse (2), high airtight device for discharging (3), wireway (4) and heat-conducting work medium (6) composition;
The face shaping of described heat-tube vacuum dryness storehouse is cylindric, and the two ends of heat-tube vacuum dryness storehouse are tapers;
There is feed inlet and outlet (9) at the two ends of described heat-tube vacuum dryness storehouse;
Described shell (1) is in the outside of Nei Cang (2), and interior storehouse (2) are in the inside of shell (1);
Be fixedly connected with by support between described shell (1) and interior storehouse (2);
Corresponding appropriate heat-conducting work medium (6) is had in inner chamber between described shell (1) and interior storehouse (2);
Described interior storehouse (2) is by warehouse (7), and radiating tube (5) and helical blade (8) form;
The feed inlet and outlet (9) at described interior storehouse (2) two ends is installed with high airtight device for discharging (3) above;
Described radiating tube (5) is light pipe, or pipe has fin;
The two ends of described radiating tube (5) are inserted in the corresponding aperture of warehouse (7); The two ends of radiating tube (5) and the inner chamber between shell (1) and interior storehouse (2) are through ventilative;
The airtight device for discharging of described height (3) has wireway (4) above;
Described helical blade (8) is weldingly fixed on warehouse (7), and the quantity of helical blade (8) is 1-6 bar.
2. a kind of heat-tube vacuum dryness storehouse according to claim 1, is characterized in that: the diameter of heat-tube vacuum dryness storehouse is 800-3500mm; The length of heat-tube vacuum dryness storehouse is 1000-25000mm.
3. a kind of heat-tube vacuum dryness storehouse according to claim 1, is characterized in that: the spacing between shell (1) and interior storehouse (2) is 5-100mm.
4. a kind of heat-tube vacuum dryness storehouse according to claim 1 is put, and it is characterized in that: high airtight device for discharging (3) is airlock, or wind stopping device, or discharge gate.
5. a kind of heat-tube vacuum dryness storehouse according to claim 1, is characterized in that: wireway (4) will seal fixing by the joint portion of high airtight device for discharging (3).
6. a kind of heat-tube vacuum dryness storehouse according to claim 1 is put, and it is characterized in that: the pipe of radiating tube (5) is the metal tube that both ends open is ventilative; The tube pitch of radiating tube (5) and radiating tube (5) is for being 50-200mm.
7. a kind of heat-tube vacuum dryness storehouse according to claim 1, it is characterized in that: the height of the fin on radiating tube (5) is 5-30mm, the thickness of the upper fin of radiating tube (5) is 0.5-3mm, and the spacing of the upper fin of radiating tube (5) and fin is 18-60mm.
8. a kind of heat-tube vacuum dryness storehouse according to claim 1, is characterized in that: the fin on radiating tube (5) and the connection form of pipe are longitudinal shapes, or around shape.
9. a kind of heat-tube vacuum dryness storehouse according to claim 1, it is characterized in that: the height of helical blade (8) is 50-500mm, the thickness of helical blade (8) is 1-10mm, and the length of helical blade (8) is 3000-35000mm.
10. a kind of heat-tube vacuum dryness storehouse according to claim 1, is characterized in that: the layout of helical blade (8) on the warehouse (7) of Nei Cang (2) is longitudinal shape, or around shape.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN201511026119.7A CN105486053A (en) | 2015-12-15 | 2015-12-15 | Heat pipe vacuum drying bin |
Applications Claiming Priority (1)
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CN201511026119.7A CN105486053A (en) | 2015-12-15 | 2015-12-15 | Heat pipe vacuum drying bin |
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CN105486053A true CN105486053A (en) | 2016-04-13 |
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CN201511026119.7A Pending CN105486053A (en) | 2015-12-15 | 2015-12-15 | Heat pipe vacuum drying bin |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105737548A (en) * | 2016-04-30 | 2016-07-06 | 张海娟 | Heat tube type drum dryer |
CN105758139A (en) * | 2016-05-06 | 2016-07-13 | 张海娟 | Forward and reverse-flow type drum dryer |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4880346A (en) * | 1972-02-07 | 1973-10-27 | ||
JPS5335362A (en) * | 1976-09-13 | 1978-04-01 | Tamura Electric Works Ltd | Preset counter |
JPH11287560A (en) * | 1998-04-02 | 1999-10-19 | Toyo Plant:Kk | Rotary type vacuum drier |
CN103994645A (en) * | 2014-05-27 | 2014-08-20 | 陶柱 | Efficient and energy-saving roller drying device |
CN203837435U (en) * | 2014-04-21 | 2014-09-17 | 湖北华世通生物医药科技有限公司 | Two-cone vacuum drying system |
CN204854306U (en) * | 2015-07-26 | 2015-12-09 | 张海娟 | Three -dimensional hot type vacuum drying storehouse that adds |
CN205482204U (en) * | 2015-12-15 | 2016-08-17 | 张海娟 | Heat pipe vacuum drying storehouse |
-
2015
- 2015-12-15 CN CN201511026119.7A patent/CN105486053A/en active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4880346A (en) * | 1972-02-07 | 1973-10-27 | ||
JPS5335362A (en) * | 1976-09-13 | 1978-04-01 | Tamura Electric Works Ltd | Preset counter |
JPH11287560A (en) * | 1998-04-02 | 1999-10-19 | Toyo Plant:Kk | Rotary type vacuum drier |
CN203837435U (en) * | 2014-04-21 | 2014-09-17 | 湖北华世通生物医药科技有限公司 | Two-cone vacuum drying system |
CN103994645A (en) * | 2014-05-27 | 2014-08-20 | 陶柱 | Efficient and energy-saving roller drying device |
CN204854306U (en) * | 2015-07-26 | 2015-12-09 | 张海娟 | Three -dimensional hot type vacuum drying storehouse that adds |
CN205482204U (en) * | 2015-12-15 | 2016-08-17 | 张海娟 | Heat pipe vacuum drying storehouse |
Non-Patent Citations (3)
Title |
---|
中国商业高等职业教育研究会: "《通风除尘与机械输送(2012.08)》", 31 August 2012 * |
刘文广: "《干燥设备设计手册(2009.07)》", 31 July 2009 * |
戴维等: "《铁合金工程技术(2015.06)》", 30 June 2015 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105737548A (en) * | 2016-04-30 | 2016-07-06 | 张海娟 | Heat tube type drum dryer |
CN105758139A (en) * | 2016-05-06 | 2016-07-13 | 张海娟 | Forward and reverse-flow type drum dryer |
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Application publication date: 20160413 |
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