CN100400997C - Heat pump tower type vacuum drier - Google Patents
Heat pump tower type vacuum drier Download PDFInfo
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- CN100400997C CN100400997C CNB2005100179239A CN200510017923A CN100400997C CN 100400997 C CN100400997 C CN 100400997C CN B2005100179239 A CNB2005100179239 A CN B2005100179239A CN 200510017923 A CN200510017923 A CN 200510017923A CN 100400997 C CN100400997 C CN 100400997C
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Abstract
The present invention discloses a heat pump tower type vacuum drier which comprises a vacuum drying silo, a vacuum pump and a heat pump, wherein a continuous reciprocation type heat medium flow path is arranged in an inner cavity of the vacuum drying silo, and is used as a condensation pipe of a condenser of the heat pump; both ends of the continuous reciprocation type heat medium flow path are respectively communicated with a main machine of the heat pump; the vacuum drying silo is provided with a vacuum pumping pipe communicated with the vacuum pump by a cavity of an evaporator of the heat pump; an evaporating pipe is arranged in the cavity of the evaporator of the heat pump; both ends of the evaporating pipe are respectively communicated with the main machine of the heat pump; the lower end of the cavity of the evaporator of the heat pump is provided with a water outlet pipe. The present invention has a reasonable design, has high efficiency because the condenser of the heat pump is arranged in the drying silo so as to directly supply heat to material, and can reduce equipment investment and greatly reduce the power of the vacuum pump because the water vapor pumped from the drying silo is fast condensed by the condensation pipe without additionally providing the condenser. Thus, the present invention has a high utilization rate of energy sources, is simultaneously favorable to environment protection, and has good social and economic benefits.
Description
One. technical field:
The present invention relates to a kind of crops drying equipment, particularly relate to a kind of heat pump tower type vacuum drier.
Two. background technology:
China is a large agricultural country, and the output of crops is huge, and its storage is bad, will go bad, and therefore need reduce the content of its moisture before storage.Traditional drying means mainly is to adopt the hot air type drying equipment at present, under normal pressure, make hot blast pass the particle of crops to evaporate its moisture, drying mode is generally cross-flow type, mixed-flow and suitable (contrary) streaming, but this drying means, destroy the interior quality of crops easily, with dry corn is example, the temperature of general hot blast is 120～160 ℃, and the natural temperature of the Northeast's dry season is-5～-30 ℃, owing to there is the huge temperature difference, cause corn its internal structure in dry run to sustain damage, so its dried crackle rate is higher, generally about 18%, sometimes even can reach 35%, corn is broken easily in the transport process afterwards, has a strong impact on the domestic and international trade of corn, causes heavy economic losses.
At this situation, people adopt vacuum technique, under low pressure crops are carried out drying, it is higher to have solved hot blast temperature, the damaged easily problem of oven dry back material, Figure 1 shows that the structural representation of existing vacuum dryer, continuous Zigzag type pipeline 2 is installed in dry silo 1, the two ends of pipeline 2 are communicated with the hot-water supply device of boiler 12 respectively, vacuum-pumping tube 3 is communicated with vavuum pump 5 by condenser 4 backs, the cold water inlet of condenser 4 is communicated with pond 11 by pipeline 7, the hot water outlet of condenser 4 enters in the cooling tower 9 by pipeline 6 and water pump 10, the upper end of cooling tower 9 is equipped with fan 8, mobile heating grain seed by hot water, this equipment is owing to adopt round Zigzag type pipeline configuration, make and form the multilayer drying duct in the dry silo 1, increase the contact area in the grain flow process, homogeneous heating, drying effect is good, utilize vacuum technique that the vapourizing temperature of material moisture in the silo is reduced to below 43 ℃ from 100 ℃, because this evaporating temperature is lower than starch gelatinization temperature, therefore can not produce damage, avoid the expansion and the quick-fried waist of seed, guarantee dried seed quality seed.But the defective that this equipment exists is: by boiler and cooling tower, its construction area is big respectively for heating and condensation, and investment is many, and efficient is low, and energy waste is serious, uses boiler to be unfavorable for environmental protection simultaneously.(Granted publication number is CN2503437Y to Chinese patent, the patent No. is 01268530.5) a kind of " vacuum heat pump drying device " disclosed, it comprises a drying box, the inner box-machine of a heat pump assembly is installed in the casing of this drying box, casing is equipped with the outer box-machine of heat pump assembly outward, this outer box-machine is connected by pipeline with inner box-machine, one water ejector is arranged, its throat links to each other with valve with pipeline by check (non-return) valve, the other end of valve is communicated with casing by pipeline, the inlet of water ejector is connected with the water under high pressure delivery side of pump by pressure piping, and the import of water pump is by water pipe, connect valve and be communicated with water tank, this device adopts heat pump, reduce environmental pollution, but also there are some defectives in it: by heat pump and cooling water, investment is many respectively for heating and condensation, and energy waste is serious.
Three. summary of the invention
Purpose of the present invention: overcome the defective of prior art, provide a kind of reasonable in design, make heating and cooling cooperatively interact utilization, improve the heat pump tower type vacuum drier of energy utilization rate greatly.
Technical scheme of the present invention: a kind of heat pump tower type vacuum drier, contain the vacuum drying silo, vavuum pump and heat pump, described vacuum drying silo contains square cylinder and reaches, bottom end cover, wherein upper end cover is provided with charging aperture, bottom end cover is provided with discharging opening, and on corresponding two barrels of square cylinder, be respectively equipped with the cavity of an independent sealing from top to bottom, two cavitys are communicated with by pipeline, be provided with dividing plate in described each cavity from top to bottom at a certain distance, this dividing plate makes thermal medium be continuously round Zigzag type at two cavitys and ducted glide path, form the mobile passage of thermal medium, the mobile passage of thermal medium in the described vacuum drying silo inner chamber is as the condenser pipe of heat pump condenser, its two ends are communicated with the heat pump main frame respectively, in the vacuum drying silo, the pipeline below of certain number of plies is provided with the horn shape vacuum-pumping tube of some, one end of described horn shape vacuum-pumping tube runs through that the cavity by evaporator with heat pump is connected with vacuum pumping pump behind the barrel of square cylinder, and this horn shape vacuum-pumping tube becomes 90 ° of arrangements with pipeline, in the cavity of described evaporator with heat pump evaporation tube is installed, the two ends of this evaporation tube are communicated with the heat pump main frame respectively, and the cavity lower end of evaporator with heat pump is provided with outlet pipe.
The cross section of described square cylinder is a square or rectangular, the shape of its upper and lower end cap is complementary with it, square cylinder is an integral structure, or be fabricated structure, cylinder section by some is fixed together by flange and sealing material layer, and wherein corresponding each cavity is communicated with up and down or separates; Horn shape vacuum-pumping tube seal welding is on barrel, or the screw thread that is provided with by its end and supporting nut and sealing gasket activity are fixed on the barrel; The pipeline of described certain number of plies is two-layer, or is four layers, or is six layers, or is eight layers.
The cross sectional shape of pipeline is a square, or is rectangle, or is rhombus, and the pipe ends seal welding is on barrel, and be communicated with cavity, or the screw thread that is provided with by the end of its two ends and supporting nut and sealing gasket activity be fixed on the barrel, and be communicated with cavity; Suit is fixed with rectangle or square fin on thermal medium flows passage, and this fin and described conduit axis have certain angle.
Be provided with a cylinder blanket around the described square cylinder, described upper and lower end cap is spherical, and the upper and lower end portion of described cylinder blanket is connected with spherical upper and lower end cap respectively, the barrel of square cylinder is all run through at the two ends of the horn shape vacuum-pumping tube in the described vacuum drying silo, at one end the barrel of end cap or cylinder blanket is provided with vacuum-pumping tube, and described vacuum-pumping tube is connected with vacuum pumping pump by the cavity of evaporator with heat pump.
The boss that is provided with roll forming on cylinder blanket is or/and groove, and described boss is or/and the cross sectional shape of groove is an open circles arc or opening is trapezoidal or square opening.
The cross sectional shape of described pipeline is a square, or is rectangle, or is oval, or is rhombus; Suit is fixed with rectangle or square fin on thermal medium flows passage, and this fin and described conduit axis have certain angle.
Two barrels in addition of square cylinder are the flat board that has the dull and stereotyped of latticed air-vent or have the ventilative seam of bar shaped; The pipeline of described certain number of plies is two-layer, or is four layers, or is six layers, or is eight layers.
Described cylinder blanket is an integral structure, is fixedly formed by a steel plate bending, or is fabricated structure, is fixed together by flange and sealing material layer by the circular arc fragment of some.
Described horn shape vacuum-pumping tube seal welding is on barrel, or the screw thread that is provided with by its end and supporting nut and sealing gasket activity are fixed on the barrel; Described pipe ends seal welding and is communicated with cavity on barrel, or the screw thread that is provided with by the end of its two ends and supporting nut and sealing gasket activity be fixed on the barrel, and is communicated with cavity.
Beneficial effect of the present invention:
The present invention reasonable in design, improve energy utilization rate greatly, the condenser of heat pump is installed in the dry silo, directly to the material heat supply, the efficient height.The cavity both ends of the evaporimeter of heat pump are communicated with vacuum-pumping tube and vavuum pump respectively, the two ends of the evaporation tube of installing in the evaporator with heat pump cavity are communicated with the heat pump main frame respectively, make the steam rapid condensation of extracting out from dry silo like this, its condensed water is flowed out by the outlet pipe of evaporator with heat pump cavity, does not need to establish in addition condenser like this, in addition, do not coagulate air and taken away and emptying, reduce the power of vavuum pump so greatly, therefore by vavuum pump, its rate of energy height has been saved a large amount of energy.
2. electricity consumption of the present invention replaces coal as the energy, and its efficiency height helps environmental protection, reduces construction area simultaneously greatly, reduces investment.
3. the round Zigzag type channel design that is provided with in the vacuum drying silo of the present invention, make and form the multilayer drying duct in the dry silo, increase the contact area in the grain flow process, homogeneous heating, drying effect is good, utilizes vacuum technique that the vapourizing temperature of material moisture in the silo is reduced to below 43 ℃ from 100 ℃, because this evaporating temperature is lower than starch gelatinization temperature, therefore can not produce damage, avoid the expansion and the quick-fried waist of seed, guarantee dried seed quality seed.
4. the present invention is provided with cylinder blanket around square cylinder, its bearing strength height, roll forming has circular arc or/and the trapezoidal reinforcement of opening on shell wall in addition, increase the bearing strength of shell more, such structure reduces the various reinforcements that are provided with owing to the bearing strength of strengthening square container greatly, save the use amount of steel significantly, cost is corresponding lower.
5. the present invention adopts does not have the both sides of cavity to be provided with vacuum-pumping tube at square cylinder, so that make the certain vacuum of maintenance in the grain layer, this side tube-wall can adopt the barrel that has latticed air-vent as required, be convenient to vacuumize, every in addition interval certain height is provided with the horn shape vacuum-pumping tube, make whole cylindrical shell form the through vacuum outlet of multilayer, therefore the thinner thickness of each layer drying layer in the silo, required vacuum power is less, and the vacuum of inner barrel is near consistent, cut down the consumption of energy corresponding raising economic benefit of enterprises greatly.
6. the present invention is easy to install, and as required, pipe ends can be welded on the barrel, also can be fixed on the barrel by bolt, nut, sealing gasket activity, can also be fixed on the barrel by the sealing ring activity, uses and makes very convenient.
7. the scope of application of the present invention is wide, and the cross sectional shape of pipeline can be according to the difference of material variety and difference, so it is applicable to various material seed dryings, and in addition owing to adopt heat pump, cost is lower, is easy to promote, and has favorable economic benefit after the popularization.
Four. description of drawings:
Fig. 1 is the structural representation of vacuum dryer in the prior art
Fig. 2 is the structural principle schematic diagram of heat pump tower type vacuum drier
Fig. 3 is one of user mode structural representation of heat pump tower type vacuum drier
Fig. 3-1 is the structural representation of mobile pipeline of thermal medium shown in Figure 3 and fin
Fig. 3-2 is the left view of Fig. 3-1
Fig. 4 be heat pump tower type vacuum drier the user mode structural representation two
Five. the specific embodiment:
Embodiment one: referring to Fig. 2, among the figure, be provided with the mobile passage 2 of continuous reciprocation type thermal medium in the inner chamber of the vacuum drying silo 1 of heat pump tower type vacuum drier, the mobile passage 2 of this thermal medium is as the condenser pipe of heat pump condenser, its two ends are communicated with heat pump main frame 14 respectively, the vacuum-pumping tube 3 that vacuum drying silo 1 is provided with is communicated with vavuum pump 5 by the cavity of evaporator with heat pump 4, evaporation tube 13 is installed in the cavity of described evaporator with heat pump 4, the two ends of this evaporation tube 13 are communicated with heat pump main frame 14 respectively, the cavity lower end of evaporator with heat pump 4 is provided with outlet pipe 6 (having control valve on the outlet pipe 6), and the below of outlet pipe 6 is pond 11.
Referring to Fig. 3, among the figure, the concrete structure of vacuum drying silo 1 is: it contains square cylinder and reaches, bottom end cover, wherein upper end cover is provided with charging aperture, bottom end cover is provided with discharging opening, and on corresponding two barrels of square cylinder, be respectively equipped with the cavity 16 of an independent sealing from top to bottom, two cavitys 16 are communicated with by pipeline 2, be provided with dividing plate from top to bottom at a certain distance in described each cavity 16, this dividing plate makes the glide path of thermal medium in two cavitys 16 and pipeline 2 for coming and going Zigzag type continuously, form the mobile passage of thermal medium, below four layers pipelines 2, be provided with the horn shape vacuum-pumping tube 15 of some, and 2 one-tenth 90 ° of arrangements of this vacuum-pumping tube 15 and pipeline, the cross sectional shape of vacuum-pumping tube 5 is formed horn shape shape by the line segment that two one ends in top cross with two downward vertical line segments of the line segment other end, and an end of vacuum-pumping tube 15 runs through barrel and compiles the back and be connected with vacuum pumping pump 5 by evaporator with heat pump 4.
The cross section of square cylinder is a square as required, also can be rectangle, the shape of its upper and lower end cap is complementary with it, square cylinder can be integral structure, also can be fabricated structure, this moment, it was fixed together by flange and sealing material layer by the cylinder section of some, and wherein corresponding each cavity is communicated with up and down or separates; Vacuum-pumping tube 15 seal weldings are on barrel, also screw thread that can be provided with by its end and supporting nut and sealing gasket activity are fixed on the barrel, the cross sectional shape of pipeline 2 is a square, also can be rectangle, can also be ellipse, or rhombus, or the rhombus of interior circular arc, kind according to dried material, select different pipelines 2 shapes for use, pipeline 2 sealed at both ends being welded on the barrel, and be communicated with cavity, screw thread that its two ends also can be provided with by the end and supporting nut and sealing gasket activity are fixed on the barrel, and are communicated with cavity.Suit is fixed with rectangle fin 2-1 (seeing Fig. 3-1 and Fig. 3-2) on thermal medium flows passage 2, fin 2-1 also can be square, and this fin 2-1 and described pipeline 2 axis have certain angle, and its angle is set as required, make material be broken-line type.
During use, heat pump main frame 14 starts, its thermal medium flows along the direction of arrow in cavity 16 and the pipeline 2, makes pipeline 2 heating, is separately installed with grain distributer and grain output device on upper end cover and bottom end cover, grain fully contacts with pipeline 2 in dropping process, reach dry purpose, vacuum-pumping tube 15 is divided into several layers with whole grain layer, is convenient to vacuumize, reduce the power of vavuum pump 5, energy savings.When the steam in the vacuum silo 1 passes through evaporator with heat pump 13 cavitys, be evaporated pipe 13 condensations, the moisture in the steam is condensed, and after this, air is taken away and emptying by vavuum pump 5, and condensed water is discharged by outlet pipe 6.Therefore its Energy Efficiency Ratio height has good economic benefits.
Embodiment two: referring to Fig. 2 and Fig. 4, present embodiment and embodiment one are basic identical, something in common does not repeat, difference is: the specific constructive form difference of vacuum drying silo 1, the concrete structure of vacuum drying silo is among this embodiment: the cavity 16 that is respectively equipped with an independent sealing on corresponding two barrels of square cylindrical shell from top to bottom, two cavitys 16 are communicated with by pipeline 2, the cross sectional shape of pipeline 2 is a square among the figure, and the one seamed edge is upwards placed, being convenient to the material seed flows, be provided with dividing plate from top to bottom at a certain distance in described each cavity 16, this dividing plate makes the glide path of thermal medium in two cavitys 16 and pipeline 2 for coming and going Zigzag type continuously, form the mobile passage of thermal medium, below four layers pipelines 2, be provided with the horn shape vacuum-pumping tube 15 of some, and 2 one-tenth 90 ° of arrangements of this vacuum-pumping tube 15 and pipeline, vacuum-pumping tube 15 two ends are weldingly fixed on other two barrels of square cylinder, these two barrels are the sealing flat board, form between itself and the shell 17 and vacuumize the chamber, be provided with a cylinder blanket 17 around the square cylinder, on this cylinder blanket 17, the bottom respectively with spherical on, bottom end cover connects, wherein upper end cover is provided with charging aperture, bottom end cover is provided with discharging opening, and be provided with vacuum-pumping tube 3 with respect to the position that vacuumizes the chamber on upper end cover, this vacuum-pumping tube 3 is communicated with vavuum pump 5 by evaporator with heat pump 4.Present embodiment adopts and embodiment one same fin 2-1.
As required, can be provided with the continuous boss and the groove of roll forming on cylinder blanket 6, to increase its intensity, the cross sectional shape of boss and groove has many kinds, as: corrugated, open circles arc, trapezoidal, the square opening of opening.
As required, two barrels in addition of square cylinder are the sealing flat board or have the dull and stereotyped of latticed air-vent or have the ventilative flat board that stitches of bar shaped, are more prone to like this vacuumize; Cylinder blanket can be integral structure, is fixedly formed by a steel plate bending, also can be fabricated structure, and it is fixed together by flange and sealing material layer by the circular arc fragment of some.
By the specific constructive form that changes the vacuum drying silo, the cross sectional shape that changes pipeline and the number of plies and the mounting means of pipeline, perhaps change the installation site and the mounting means of vacuum-pumping tube, can form many embodiment, be excursion of the present invention, not describe in detail one by one at this.
Claims (9)
1. heat pump tower type vacuum drier, contain the vacuum drying silo, vavuum pump and heat pump, described vacuum drying silo contains square cylinder and reaches, bottom end cover, wherein upper end cover is provided with charging aperture, bottom end cover is provided with discharging opening, and on corresponding two barrels of square cylinder, be respectively equipped with the cavity of an independent sealing from top to bottom, two cavitys are communicated with by pipeline, be provided with dividing plate in described each cavity from top to bottom at a certain distance, this dividing plate makes thermal medium be continuously round Zigzag type at two cavitys and ducted glide path, form the mobile passage of thermal medium, it is characterized in that: the mobile passage of the thermal medium in the described vacuum drying silo inner chamber is as the condenser pipe of heat pump condenser, its two ends are communicated with the heat pump main frame respectively, in the vacuum drying silo, the pipeline below of certain number of plies is provided with the horn shape vacuum-pumping tube of some, one end of described horn shape vacuum-pumping tube runs through that the cavity by evaporator with heat pump is connected with vacuum pumping pump behind the barrel of square cylinder, and this horn shape vacuum-pumping tube becomes 90 ° of arrangements with pipeline, in the cavity of described evaporator with heat pump evaporation tube is installed, the two ends of this evaporation tube are communicated with the heat pump main frame respectively, and the cavity lower end of evaporator with heat pump is provided with outlet pipe.
2. heat pump tower type vacuum drier according to claim 1, it is characterized in that: the cross section of described square cylinder is a square or rectangular, the shape of its upper and lower end cap is complementary with it, square cylinder is an integral structure, or be fabricated structure, cylinder section by some is fixed together by flange and sealing material layer, and wherein corresponding each cavity is communicated with up and down or separates; Horn shape vacuum-pumping tube seal welding is on barrel, or the screw thread that is provided with by its end and supporting nut and sealing gasket activity are fixed on the barrel; The pipeline of described certain number of plies is two-layer, or is four layers, or is six layers, or is eight layers.
3. heat pump tower type vacuum drier according to claim 1 and 2, it is characterized in that: the cross sectional shape of pipeline is square, or be rectangle, or be rhombus, and the pipe ends seal welding is on barrel, and be communicated with cavity, or the screw thread that is provided with by the end of its two ends and supporting nut and sealing gasket activity be fixed on the barrel, and be communicated with cavity; Suit is fixed with rectangle or square fin on thermal medium flows passage, and this fin and described conduit axis have certain angle.
4. heat pump tower type vacuum drier according to claim 1, it is characterized in that: be provided with a cylinder blanket around the described square cylinder, described upper and lower end cap is spherical, and the upper and lower end portion of described cylinder blanket is connected with spherical upper and lower end cap respectively, the barrel of square cylinder is all run through at the two ends of the horn shape vacuum-pumping tube in the described vacuum drying silo, at one end the barrel of end cap or cylinder blanket is provided with vacuum-pumping tube, and described vacuum-pumping tube is connected with vacuum pumping pump by the cavity of evaporator with heat pump.
5. heat pump tower type vacuum drier according to claim 4 is characterized in that: the boss that is provided with roll forming on cylinder blanket is or/and groove, and described boss is or/and the cross sectional shape of groove is an open circles arc or opening is trapezoidal or square opening.
6. according to claim 4 or 5 described heat pump tower type vacuum driers, it is characterized in that: the cross sectional shape of described pipeline is square, or is rectangle, or is oval, or is rhombus; Suit is fixed with rectangle or square fin on thermal medium flows passage, and this fin and described conduit axis have certain angle.
7. heat pump tower type vacuum drier according to claim 6 is characterized in that: two barrels in addition of square cylinder are the flat board that has the dull and stereotyped of latticed air-vent or have the ventilative seam of bar shaped; The pipeline of described certain number of plies is two-layer, or is four layers, or is six layers, or is eight layers.
8. heat pump tower type vacuum drier according to claim 7, it is characterized in that: described cylinder blanket is an integral structure, fixedly form by a steel plate bending, or be fabricated structure, be fixed together by flange and sealing material layer by the circular arc fragment of some.
9. heat pump tower type vacuum drier according to claim 8 is characterized in that: described horn shape vacuum-pumping tube seal welding is on barrel, or the screw thread that is provided with by its end and supporting nut and sealing gasket activity are fixed on the barrel; Described pipe ends seal welding and is communicated with cavity on barrel, or the screw thread that is provided with by the end of its two ends and supporting nut and sealing gasket activity be fixed on the barrel, and is communicated with cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100179239A CN100400997C (en) | 2005-08-25 | 2005-08-25 | Heat pump tower type vacuum drier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100179239A CN100400997C (en) | 2005-08-25 | 2005-08-25 | Heat pump tower type vacuum drier |
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| CN1749683A CN1749683A (en) | 2006-03-22 |
| CN100400997C true CN100400997C (en) | 2008-07-09 |
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| CNB2005100179239A Expired - Fee Related CN100400997C (en) | 2005-08-25 | 2005-08-25 | Heat pump tower type vacuum drier |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1862197B (en) * | 2006-06-06 | 2010-05-12 | 青岛大学 | Drum drying method |
| CN101487661B (en) * | 2008-01-16 | 2012-01-04 | 凌建军 | Waste heat cyclic utilization type high-efficiency energy-saving drying machine |
| CN101487662B (en) * | 2008-01-16 | 2012-01-04 | 凌建军 | Waste heat cyclic utilization type high-efficiency energy-saving drying machine |
| CN101957125B (en) * | 2009-07-15 | 2012-02-08 | 郑州市飞航真空干燥技术有限公司 | Multiple-effect vacuum continuous drying equipment |
| CN106944487B (en) * | 2017-05-26 | 2018-12-18 | 湖南天益高技术材料制造有限公司 | It is a kind of to realize control device of the passing water cooler end without discharge of steam |
| CN112648800A (en) * | 2020-11-23 | 2021-04-13 | 朱拥民 | Low-temperature grain drying process for grain production line |
| CN112661381A (en) * | 2020-11-24 | 2021-04-16 | 无锡锡源真空设备有限公司 | Vacuum drying furnace for sludge treatment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4893415A (en) * | 1986-02-06 | 1990-01-16 | Steen Ole Moldrup | Method for the drying of wood and wood-based products |
| GB2263968A (en) * | 1991-12-02 | 1993-08-11 | Rodolfo Jorge Neumann | Drying timber |
| US5353519A (en) * | 1991-10-30 | 1994-10-11 | Saibu Gas Co., Ltd. | Vacuum drying equipment |
| CN2391153Y (en) * | 1998-11-26 | 2000-08-09 | 赵小光 | Forward and backward grains dryer |
| CN2529175Y (en) * | 2002-03-19 | 2003-01-01 | 张歌今 | Heat pump grain dryer |
| CN2709897Y (en) * | 2004-03-03 | 2005-07-13 | 何翔 | Grain drying cylinder and grain vacuum low-temp continuous drying equipment |
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2005
- 2005-08-25 CN CNB2005100179239A patent/CN100400997C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4893415A (en) * | 1986-02-06 | 1990-01-16 | Steen Ole Moldrup | Method for the drying of wood and wood-based products |
| US5353519A (en) * | 1991-10-30 | 1994-10-11 | Saibu Gas Co., Ltd. | Vacuum drying equipment |
| GB2263968A (en) * | 1991-12-02 | 1993-08-11 | Rodolfo Jorge Neumann | Drying timber |
| CN2391153Y (en) * | 1998-11-26 | 2000-08-09 | 赵小光 | Forward and backward grains dryer |
| CN2529175Y (en) * | 2002-03-19 | 2003-01-01 | 张歌今 | Heat pump grain dryer |
| CN2709897Y (en) * | 2004-03-03 | 2005-07-13 | 何翔 | Grain drying cylinder and grain vacuum low-temp continuous drying equipment |
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| CN1749683A (en) | 2006-03-22 |
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Granted publication date: 20080709 Termination date: 20100825 |