JP2006105447A - Vacuum drying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly efficient vacuum drying device for giving drying treatment to dried objects which are starch food residues such as white rice with no adverse effects of a crushing device, when provided separately. <P>SOLUTION: The vacuum drying device for heating, agitating and drying the dried objects 3 in a vacuum condition comprises a drying pan 1 to be internally heated in a vacuum condition and an agitator 2 provided in the drying pan 1 for agitating the dried objects 3. A crusher 5 is provided in the drying pan 1 for crushing the dried objects 3 charged from a charge port 4 into the drying pan 1 before agitating and drying them with the agitator 2. A crusher heating means is provided for heating the crusher 5 itself when crushing the dried objects 3 with the crusher 5. When crushed, the dried objects 3 are heated for primary drying and agitated with the agitator 2 for secondary drying. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vacuum drying apparatus that heats and dries organic waste containing moisture in a vacuum state.

  In general, organic waste containing moisture includes kitchen leftovers and leftovers in canteens and hotels, leftovers for school and hospital meals, supermarkets, convenience stores, department stores, grocery stores and other items that have passed their warranty period. There are also remnants in food factories. If such organic waste is left as it is, there is a problem that the amount of the waste collected by the industrial waste disposal contractor becomes extremely large and the cost increases.

Therefore, in order to reduce the amount of organic waste, in recent years, a vacuum drying apparatus for heating and drying organic waste in a vacuum state has been provided (for example, see Patent Document 1). Such a vacuum drying apparatus includes a drying kettle whose inside is heated in a vacuum state and a stirrer provided in the drying kettle to stir the material to be dried, and heats and stirs the material to be dried in a vacuum state. And dry.
JP-A-11-337258

  In such a vacuum drying apparatus, drying is performed smoothly by heating in a vacuum state, but in order to perform drying more efficiently, a dryer a that performs a vacuum drying process as shown in FIGS. Apart from this, it is necessary to install the crushing device b as ancillary equipment, crush the material c to be dried, which is organic waste, with the crushing device b, and then put it into the dryer a to perform the drying treatment. However, the vacuum drying apparatus that requires the crushing apparatus b as such an accessory apparatus has a problem that the cost of the crushing apparatus b itself is generated, a problem of an installation location of the crushing apparatus b, and a problem of a method of feeding a crushed dry matter. Etc. It appears more prominently as the processing amount of the material to be dried c is larger. In the case of the one shown in FIG. 10, a conveying device such as a conveyor is required in the conveying portion d between the crushing device b and the dryer a, which causes a cost increase and a conveyance trouble, and is horizontal as indicated by a symbol e. There is a problem that the installation space in the direction becomes large. In the case of what is shown in FIG. 11, the stand f for installing the crushing apparatus b is needed, and there exists a problem that the installation space of an up-down direction becomes large as shown to the code | symbol g.

  Further, in the conventional vacuum drying apparatus, stirring is performed with a stirring blade in order to stir the material to be dried. As a conventional stirring blade of this type, a ribbon screw type stirring blade h as shown in FIG. A paddle type stirring blade i as shown in FIG. 13 is the mainstream. The ribbon screw type, which has particularly good drying performance, is used in many vacuum drying apparatuses. However, in the ribbon screw type, the material to be dried is pressed against the heat transfer surface and stirred. Therefore, when the material to be dried is a starch-based food residue such as white rice, it is fixed to the stirring shaft or the like by kneading ( A dumpling phenomenon occurs, and it is difficult to dry well. In the case of the paddle type, it becomes a large lump (in some cases, large lumps adhere to each other to form a huge lump), and it is difficult to perform a good drying process.

  The present invention has been invented in view of the above-mentioned conventional problems, has no harmful effect of providing a separate crushing apparatus, and can be dried even if the food to be dried is starch-based food residue such as white rice. An object of the present invention is to provide an efficient vacuum drying apparatus.

  In order to solve the above problems, a vacuum drying apparatus according to a first aspect of the present invention includes a drying pot 1 whose inside is heated in a vacuum state, and a stirrer 2 provided in the drying pot 1 for stirring an object to be dried 3. In a vacuum drying apparatus that heats the material to be dried 3 in a vacuum state and stirs to dry, the material to be dried that is put into the drying kettle 1 from the inlet 4 before being stirred and dried by the stirrer 2 A crusher 5 for crushing the product 3 is provided in the drying kettle 1, and a crusher heating means for heating the crusher 5 itself is provided when crushing the material 3 to be dried by the crusher 5, thereby crushing the material 3 to be dried. It is characterized by crushing while heating and performing primary drying and secondary drying while stirring with a stirrer 2.

  According to said structure, when the to-be-dried material 3 is thrown in in the drying pot 1 from the inlet 4, the to-be-dried material 3 will be crushed with the crusher 5, but the vacuum state in the drying pot 1 at this time The material to be dried 3 is first dried while being crushed while being heated by a crusher heating means and being crushed, and the material to be dried 3 crushed and primary dried is stirred by the stirrer 2. However, it is secondarily dried in the atmosphere in the drying pot 1. In this way, the material to be dried 3 is dried, but since it is crushed by the crusher 5, the drying efficiency is improved and, of course, the crusher 5 is provided in the drying pot 1, so that it is conventional. There is no adverse effect such as providing a separate crushing device. In addition, when crushing with the crusher 5, the time required for the secondary drying to be dried while stirring with the stirrer 2 is reduced in order to perform the primary drying of the material 3 to be dried. When the material to be dried 3 is dried to some extent for primary drying when crushing with the machine 5, secondary drying is performed, so when the material to be dried is dried with stirring by the stirrer 2 even with starch-based food residues such as white rice The dried product 3 can be dried without any harmful effects even if it is a starch-based food residue such as white rice. Moreover, in addition to drying in two stages as described above, the material to be dried 3 can be quantitatively and slowly dropped from the crusher 5 to the portion to be secondarily dried by the stirrer 2, which also promotes drying. Can do.

  The vacuum drying apparatus according to claim 2 of the present invention includes a drying pot 1 whose inside is heated in a vacuum state, and a stirrer 2 provided in the drying pot 1 for stirring the object to be dried 3. In a vacuum drying apparatus that heats and drys an object to be dried in a state, a plurality of blade support shafts 8 project radially from a stirring shaft 7 that is rotationally driven, and the blade support shaft 8 A blade 9 made of a short ribbon-like plate is provided at the tip, and the drying kettle 1 is heated from the outside of the drying kettle 1 so that the inner wall of the drying kettle 1 is heated, and the stirring shaft 7 is driven to rotate. When stirring at 9, the angle at which the dumpling of the material to be dried 3 is crushed, the angle at which the material to be dried 3 is slowly pressed against the inner wall of the drying kettle 1, the angle at which the material to be dried 3 is strongly pressed against the inner wall of the drying kettle 1, So that the object 3 is scraped off from the inner wall of the drying pot 1 Characterized in that the angle of the vanes 9 in the circumferential direction of the stirring shaft 7 is provided in place of the order.

  According to the above configuration, when the stirring shaft 7 is rotationally driven and stirred by the blade 9 to dry, the blade 9 is formed of a short ribbon-like plate, so that compared to the conventional ribbon screw type. It is difficult to form dumplings, and the dried product 3 can be dried even with starch-based food residues such as white rice. At this time, the object to be dried 3 is pressed against the inner wall of the drying kettle 1 that is heated to accelerate drying, and the object to be dried 3 adhered to the inner wall of the drying kettle 1 is scraped off from the inner wall of the drying kettle 1. The dumpling of the material 3 to be dried was crushed, and the agitation was repeated so as to accelerate the drying by pressing the material 3 again against the inner wall of the drying kettle 1 and stirring so as not to form a dumpling while promoting the drying. In addition, even if the material to be dried is starch-based food residue such as white rice, it can be further dried without any harmful effects. In particular, by strongly pressing the object to be dried 3 against the inner wall of the heated drying kettle 1, the efficiency of drying the object to be dried is improved and drying is promoted.

  The vacuum drying apparatus according to a third aspect of the present invention is the vacuum drying apparatus according to the first aspect, wherein the crusher 5 includes a plurality of crushing blades 11 arranged in parallel in the axial direction on a pair of parallel drive shafts 10 and one drive shaft 10. The crushing blades 11 are engaged with each other so that the crushing blades 11 of the other drive shaft 10 and the crushing blades 11 of the other drive shaft 10 are alternately positioned in the axial direction. A protruding piece-like cutting edge portion 11a is provided. In this case, by driving the drive shaft 10, it can be finely crushed by the cutting edge portion 11 a of the crushing blade 11 and can be effectively dried by smoothly applying heat to the object to be dried 3.

  According to a fourth aspect of the present invention, there is provided a vacuum drying apparatus according to the first or third aspect, wherein the agitator 2 is provided with a plurality of blade support shafts 8 projecting radially from the rotationally driven stirring shaft 7 and the blade support shaft. 8 is formed by providing a blade 9 at the tip, and the blade 9 is formed of a short ribbon-like plate. In this case, the agitation shaft 7 is rotationally driven and agitated by the blade 9, but since the blade 9 is formed of a short ribbon-shaped plate, it is kneaded and dumped in comparison with the conventional ribbon screw type. It is difficult to dry, and the drying object 3 is easy to be dried even with starch-based food residues such as white rice.

  In the vacuum drying apparatus according to claim 5 of the present invention, the drying pot 1 is heated from the outside of the drying pot 1 so that the inner wall of the drying pot 1 is heated. It is characterized by. In this case, when the material to be dried 3 is stirred and dried, the material to be dried 3 is pressed against the inner wall of the drying kettle 1 to heat the material to be dried 3 to promote drying.

  The vacuum drying apparatus according to a sixth aspect of the present invention is the vacuum drying apparatus according to the fifth aspect, wherein when the stirring shaft 7 is rotationally driven and stirred by the blades 9, the angle of crushing the dumplings of the dried material 3 is reduced. In the circumferential direction of the agitation shaft 7, the angle of pressing slowly against the inner wall of the drying pot 1, the angle of pressing the object to be dried 3 strongly against the inner wall of the drying pot 1, and the angle of scraping the object to be dried 3 from the inner wall of the drying pot 1. It is characterized in that the angle of the blades 9 is changed in order. In this case, when the object to be dried 3 is dried by rotating the stirring shaft 7, the object to be dried 3 is pressed against the inner wall of the drying pot 1 to accelerate the drying, and the object to be dried 3 adhered to the inner wall of the drying pot 1. Is removed from the inner wall of the drying kettle 1, the dumpling of the material to be dried scraped from the drying kettle 1 is crushed, and stirring is repeated so as to accelerate the drying by pressing the dried material 3 against the inner wall of the drying kettle 1 again. Further, it can be stirred so as not to form dumplings while promoting drying, and even the starch-based food residue such as white rice can be further dried without causing any harmful effects.

  Since the present invention improves the efficiency of drying because it is crushed by a crusher as described above, the crusher is provided in the drying kettle, so that the conventional crushing device is separately provided. There is no effect. That is, by using a built-in crusher built in the drying kettle, there is no need to worry about the crushing device and the dryer as in the conventional case, and the cost is lower than installing a separate crushing device. Moreover, in the case of installing a crushing device separately, the installation location of the crushing device becomes a problem, but the installation space can be reduced by the built-in type. In addition, when crushing with a crusher, in order to perform primary drying of the material to be dried, the time required for secondary drying while stirring with a stirrer is shortened, and as a result, the time required for drying can be shortened. When crushing with a crusher, the dried product is dried to a certain extent in order to perform primary drying, so the dried product is dried while stirring with a stirrer even with starch-based food residues such as white rice. It is less likely to be in a state, and there is an effect that it can be dried without adverse effects even if the material to be dried is a starch-based food residue such as white rice.

  Also, when the agitation shaft is driven to rotate and agitated with a blade and dried, the blade is formed of a short ribbon-like plate, so it is less likely to form a dumpling than the conventional ribbon screw type. This has the effect that the dried product can be dried with starch-based food residues such as white rice, and the dried product is pressed against the inner wall of the heated drying kettle to accelerate the drying, and the coated material adhered to the inner wall of the dried kettle. The dried product is scraped from the inner wall of the drying kettle, the dumplings of the dried product scraped from the inner wall of the drying kettle are crushed, and stirring is repeated so as to accelerate the drying by pressing the dried product against the inner wall of the drying kettle again. In addition, it is possible to stir so as not to form dumplings while promoting drying, and it is effective in that even a starch-based food residue such as white rice can be further dried without causing any harmful effects.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings. FIG. 1 shows the entire system of the vacuum drying apparatus of the present invention. The drying pot 1 which is the main body of this apparatus is configured to heat and dry a material to be dried 3 put in the apparatus in a vacuum state. A heating jacket 12 is provided around the drying kettle 1, and the inner wall of the drying kettle 1 can be heated by supplying heat to the heating jacket 12 with a heating medium such as warm water or steam. At this time, when the heat medium is hot water, the heat medium enters the heating jacket 12 as indicated by an arrow A in FIG. 1 and circulates through the heat source device such that the heat medium exits from the heating jacket 12 as indicated by an arrow B in FIG. It is supposed to be. The temperature of the heating medium entering the heating jacket 12 as indicated by the arrow A is 85 ° C., for example, and the temperature of the heating medium exiting from the heating jacket 12 as indicated by the arrow B is, for example, 80 ° C. When the heat medium is steam, the heat medium enters the heating jacket 12 in the direction opposite to the arrow B in FIG. 1, and the heat medium exits from the heating jacket 12 in the direction opposite to the arrow A in FIG.

  Further, the air in the drying pot 1 is sucked by the vacuum pump 13 through the dust collecting unit 14, the heat exchanger (condenser) 15, the drain tank 16, and the check valve 17, so that the vacuum state is maintained. . Further, the cooling water cooled by the cooling tower 18 is circulated to the heat exchanger 15 so that the heat exchanger 15 is cooled. When the vacuum pump 13 is driven and the inside of the drying pot 1 is evacuated, the inside of the drying pot 1 is decompressed to about 60 to 100 Torr. The water contained in the material to be dried 3 in the drying kettle 1 is evaporated by heating the drying kettle 1, and the exhaust gas containing evaporated water passes through the dust collector 14 by the suction of the vacuum pump 13 and is cooled and condensed by the heat exchanger 15. As a result, the gas and liquid are separated, and the condensed water accumulates in the drain tank 16 and the dry exhaust gas is exhausted to the atmosphere. The donren tank 16 is provided with a liquid level gauge 19 so that when a certain amount of condensed water accumulates in the drain tank 16, it is drained.

  At the upper part of the drying pot 1, there is provided an inlet 4 into which an object to be dried 3 made of organic waste containing moisture is introduced. The inlet 4 is airtightly closed by an inlet lid 20. A hopper 21 that receives an object to be dried 3 introduced from the inlet 4 is provided in the upper part of the drying pot 1, and a crusher 5 is disposed at the lower end outlet of the hopper 21. The crusher 5 includes a pair of drive shafts 10 that are rotationally driven by a motor, and a crushing blade 11 that is mounted on each drive shaft 10 so as to be arranged in the axial direction. A heating jacket for heating the crusher 5 is provided inside the drive shaft 10 of the crusher 5, and heat is also supplied to the heating jacket with a heat medium such as hot water or steam. As shown in C, the heat medium enters, and as shown by the arrow D, the heat medium comes out. The temperature of the heat medium entering as indicated by arrow C is, for example, 85 ° C., and the temperature of the heat medium exiting as indicated by arrow D is, for example, 80 ° C.

  A stirrer 2 is provided in the lower part of the drying kettle 1 so that the material to be dried 3 can be dried by stirring with the stirrer 2. The stirrer 2 has blade support shafts 8 projecting radially from a stirring shaft 7 driven by a motor and a blade 9 attached to the tip of the blade support shaft 8. Can be agitated. The stirring shaft 7 is driven so as to repeat forward rotation and reverse rotation, and the rotation speed is about 2 to 3 rpm. A dry matter discharge unit 28 for discharging the dried product is provided at the bottom of the drying pot 1.

  In the case of drying an object to be dried 3 made of organic waste containing moisture with the vacuum drying apparatus configured as described above, the drying is performed as follows in a batch method. The material to be dried 3 is charged into the hopper 21 in the drying kettle 1 from the charging port 4, a heating medium is supplied to the heating jacket 12 of the drying kettle 1 to heat the drying kettle 1, and the inside of the drying kettle 1 is evacuated. The crusher 5 is driven, the crusher 5 is heated, and the stirrer 2 is driven. Then, the to-be-dried material 3 thrown into the hopper 21 is dried in the atmosphere in the heating kettle 1, and is crushed by the crusher 5 and heated and dried when crushed. As a result, the material to be dried 3 is primarily dried in the upper primary drying section in the drying pot 1 and supplied to the lower secondary drying section in the drying pot 1. The time until all of the object to be dried 3 in the hopper 21 is crushed is, for example, about 4 hours although it depends on the amount of the object to be dried 3. Moreover, when drying the to-be-dried material 3 in a primary drying part, it dries so that a moisture content may be about 65 to 50%, for example. The material to be dried 3 that has been primary dried in the primary drying section and dropped to the secondary drying section is dried in the atmosphere of the drying kettle 1 while being stirred by the stirrer 2. The time for drying in the secondary drying section is, for example, about 20 hours. By drying in the secondary drying section, for example, the moisture content is dried to be 50% to 10%. The dried product is finely granulated and is discharged from the dried product discharge unit 28.

  Although the material to be dried 3 is dried as described above, the time required for drying for two-stage drying in the primary drying unit and the secondary drying unit can be shortened. The material to be dried 3 is crushed and primary dried in the primary drying unit and then secondary dried in the secondary drying unit. It can be dried well without adhering to a dumpling or forming a large lump. Moreover, in addition to drying in two stages as described above, the material to be dried 3 can be quantitatively and slowly dropped from the crusher 5 to the portion to be secondarily dried by the stirrer 2, which also promotes drying. Can do. It is reduced by drying in this way, and the amount taken up as industrial waste can be reduced. In addition, the dried product can be fertilized.

  Next, the structure of the crusher 5 will be described in more detail. 2 and 3 show a crusher 5 equipped with a crushing blade 11 suitable for crushing vegetable residues. The crushing blade 11 is provided with a plurality of cutting blade portions 11a protruding outward at equal intervals in the circumferential direction on the outer periphery of the annular main body 11b. In the case of this example, five cutting blade portions 11a are provided and have five blades. The crushing blade 11 has a thickness of about 12 mm, but the amount of protrusion of the cutting blade portion 1a in the outer peripheral direction is small. A cylindrical lever portion 23 is provided in the axial direction on the outer periphery of the drive shaft 10, and a plurality of crushing blades 11 are fitted on the lever portion 23, and the crushing blade 11 is attached to the screw tool 24. It is fixed to the lever part 23 by tightening. When a plurality of crushing blades 11 are axially aligned and fixed to the lever portion 23, the crushing blades 11 of the adjacent drive shafts 10 are alternately overlapped with each other so as to be engaged with each other. It is. When a plurality of crushing blades 11 are mounted side by side in the axial direction of the drive shaft 10, it is preferable that the circumferential phases of adjacent crushing blades 11 are slightly shifted. And the to-be-dried material 3 can be cut | disconnected and crushed between the cutting-blade parts 11a of the corresponding crushing blade 11 by rotationally driving a pair of drive shaft 10. FIG.

  FIG. 4 shows a crusher 5 equipped with a crushing blade 11 suitable for crushing residues of starch-based foods such as white rice. The crushing blade 11 is provided with a cutting edge portion 11a protruding outward at equal intervals in the circumferential direction on the outer periphery of a main body 11b having a square hole 25 drilled in the center. In the case of this example, five cutting blade portions 11a are provided and have five blades. The crushing blade 11 has a thin plate thickness of about 5 mm, but the protruding amount of the cutting blade portion 1a in the outer peripheral direction is large. A square cylindrical cylinder 26 is attached to the outer periphery of the drive shaft 10 in the axial direction, and a plurality of crushing blades 11 are attached so that the square holes 25 are inserted into the cylindrical body 26. When a plurality of crushing blades 11 are mounted side by side on the cylindrical body 26, the crushing blades 11 of the adjacent drive shafts 10 are alternately overlapped with each other so as to be engaged with each other. In addition, when a plurality of crushing blades 11 are mounted side by side in the axial direction of the drive shaft 10, it is preferable that the circumferential phases of the adjacent crushing blades 11 are slightly shifted. Then, by rotating and driving the pair of drive shafts 10, the material to be dried 3 can be cut and crushed between the cutting blade portions 11 a of the corresponding crushing blades 11. Since the protruding length of 11a is long, even starch-based food residues such as white rice can be crushed.

  Further, the crushing blade 11 of FIG. 5 is a six-blade having six cutting blade portions 11a. A square hole 27 is formed in the center of the main body 11b by overlapping two squares whose phases are shifted by 45 °. Similar to the example shown in FIG. 4, the crushing blade 11 is attached to the cylindrical body 26 of the drive shaft 10 by inserting a square hole 27.

  Next, the stirrer 2 will be described. As shown in FIG. 6, the stirrer 2 has a plurality of blade support shafts 8 protruding in a radial direction on a stirring shaft 7 that is rotationally driven by repeating forward rotation and reverse rotation, and is short at the tip of the blade support shaft 8. Ribbon-shaped blades 9 are attached. A plurality of blade support shafts 8 are juxtaposed in the circumferential direction and the axial direction of the stirring shaft 7. In the case of this example, four protrusions are provided with a phase shift of 90 ° in the circumferential direction of the stirring shaft 7. Here, for convenience, the blade support shafts 8 whose phases are shifted in the circumferential direction are referred to as blade support shafts 8a, 8b, 8c, and 8d. A scraping blade 9a is mounted on the blade support shaft 8a, a crushing blade 9b is mounted on the blade support shaft 8b, a first pressing blade 9c is mounted on the blade support shaft 8c, and the blade support shaft 8d is attached to the blade support shaft 8d. Has a second pressing blade 9d.

  As shown in FIG. 7, the scraping blade 9 a is formed by integrally joining a connection tube 31 to a rectangular flat blade plate 30, and an angle α at which the connection tube 31 intersects the blade plate 30 is The crossing is made at approximately 45 °. The scraping blade 9 a is fixed by fitting the connecting cylinder 31 onto the blade support shaft 8 a and tightening the tightening screw 32.

  As shown in FIG. 8, the crushing blade 9 b is formed by integrally joining the connecting cylinder 31 to the fan-shaped flat blade plate 33, but the angle β at which the connecting cylinder 31 intersects the blade plate 33 is substantially equal. It crosses to be 45 °. In this crushing blade 9b, the connecting cylinder 31 is fitted on the blade support shaft 8b and fixed by tightening the tightening screw 32, but the blade plate 33 is in a state parallel to the stirring shaft 7 as shown in FIG. The angle is inclined by γ (45 ° in this example).

  As shown in FIG. 8, the first pressing blade 9 c is formed by integrally joining the connecting tube 31 to the fan-shaped flat blade plate 33, but the angle β at which the connecting tube 31 intersects the blade plate 33. Is crossed so as to be 67.5 °, for example. In this first pressing blade 9c, the connecting cylinder 31 is fitted on the blade support shaft 8c and fixed by tightening the tightening screw 32, but the blade plate 33 is parallel to the stirring shaft 7 as shown in FIG. The angle is inclined from the state by γ (45 ° in this example).

  As shown in FIG. 8, the second pressing blade 9 d is formed by integrally joining the connecting tube 31 to the fan-shaped flat blade plate 33, but the angle β at which the connecting tube 31 intersects the blade plate 33. Is crossed so as to be, for example, 77.6 °. In the second pressing blade 9d, the connecting cylinder 31 is fitted on the blade support shaft 8d and fixed by tightening the tightening screw 32, but the blade plate 33 is parallel to the stirring shaft 7 as shown in FIG. The angle is inclined from the state by γ (45 ° in this example).

  By rotating the stirring shaft 7 with the stirrer 2 configured as described above, the blade 9 is rotationally driven through the blade support shaft 8, and the material to be dried 3 is dried while stirring in the secondary drying section. At this time, the agitation shaft 7 is driven by repeating forward rotation (here, the counterclockwise direction in FIG. 6A) and reverse rotation. At this time, since the blades 9 are formed in a short ribbon shape, the material to be dried 3 is not kneaded even with starch food residues such as white rice, and can be smoothly stirred and dried.

  In particular, when the stirring shaft 2 is rotated forward and stirred, the material 3 to be dried adhered to the inner wall of the drying pot 1 is scraped off by the scraping blade 9a, and the dumped dumped material 3 becomes the crushing blade 9b. Then, the material to be dried 3 is slowly pressed against the inner wall of the drying pot 1 heated from the outside by the first pressing blade 9c, and then the material to be dried 3 is heated from the outside by the second pressing blade 9d. The to-be-dried material 2 is stirred so that the to-be-dried material 3 adhered to the inner wall of the drying kettle 1 is scraped again, and the to-be-dried material 3 is a starch food such as white rice. The residue is further stirred and dried so as not to form dumplings or lumps. At this time, the object to be dried 3 is strongly pressed against the inner wall of the heated drying pot 1, so that the efficiency of heating the object to be dried 3 is improved and drying is further promoted. If the inner wall of the drying pot 1 is not heated and stirring is performed while the inside of the drying pot 1 is heated by using a heater or the like, it does not become a good dry state. It became a lump of shape.

  In the description of the above embodiment, when the scraping blade 9a, the crushing blade 9b, the first pressing blade 9c, and the second pressing blade 9d are provided on the radial blade support shafts 8a, 8b, 8c, 8d, the stirring shaft Although the same phase is illustrated and described over the axial direction of 7, the scraping blade 9a, the crushing blade 9b, the first pressing blade 9c, and the second pressing blade 9d in the axial direction of the stirring shaft 7 are described. May be shifted in the circumferential direction. Stirring is effectively performed by shifting the phase in this way.

It is a conceptual diagram which shows a system for the whole example of embodiment of the vacuum-drying apparatus of this invention. An example of a crusher same as the above is shown, (a) is a plan view, and (b) is a side view showing meshing of crushing blades. (A) is a perspective view of a crushing blade, (b) is a top view which shows the attachment state of a crushing blade. The other example of a crusher same as the above is shown, (a) is a side view of a crushing blade, (b) is a perspective view which shows the attachment state of the crushing blade. It is a side view of the other example of the crushing blade same as the above. (A) The side view which shows the agitator same as the above, (b) is a perspective view of the principal part, (c) is a perspective view of a state different from (b). It is a perspective view explaining the blade | wing for scraping same as the above. (A) (b) is a perspective view explaining the blade | wing for crushing same as the above, the blade | wing for 1st pressing, and the blade | wing for 2nd pressing. It is a front view explaining the attachment state of the blade | wing for crushing same as the above, the blade | wing for 1st pressing, and the blade | wing for 2nd pressing. It is a conceptual diagram explaining a prior art example. It is a conceptual diagram explaining another prior art example. It is a front view which shows a ribbon screw type stirring blade. It is a front view which shows a paddle type stirring blade.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drying pot 2 Stirrer 3 To-be-dried object 4 Inlet 5 Crusher 7 Agitation shaft 8 Blade support shaft 9 Blade 10 Drive shaft 11 Crushing blade 11a Cutting blade part

Claims (6)

Vacuum drying that has a drying pot heated inside in a vacuum state and a stirrer provided in the drying pot to stir the material to be dried, and heats the material to be dried in a vacuum state and stirs to dry In the apparatus, a crusher is provided in the drying kettle to crush the material to be dried that has been introduced from the inlet into the drying kettle before being stirred and dried with a stirrer, and the crusher is used to crush the material to be dried with this crusher. A vacuum drying apparatus provided with a crusher heating means for heating itself, crushing while drying the material to be dried and performing primary drying and secondary drying while stirring with a stirrer . Vacuum drying that has a drying pot heated inside in a vacuum state and a stirrer provided in the drying pot to stir the material to be dried, and heats the material to be dried in a vacuum state and stirs to dry In the apparatus, the stirrer is formed by projecting a plurality of blade support shafts radially from a rotationally driven stirring shaft and providing a blade made of a short ribbon-like plate at the tip of the blade support shaft. When the stirring shaft is driven to rotate and the blade is stirred with blades, the angle to crush the dumpling of the material to be dried, and the material to be dried slowly onto the inner wall of the drying kettle The blade angle is changed in order in the circumferential direction of the stirring shaft so that the angle to press, the angle to strongly press the material to be dried against the inner wall of the drying kettle, and the angle to scrape the material to be dried from the inner wall of the drying kettle are provided. Vacuum drying equipment. In the crusher, a plurality of crushing blades are arranged side by side in parallel in a pair of parallel drive shafts, and crushing blades of one drive shaft and crushing blades of the other drive shaft are alternately positioned in the axial direction. 2. The vacuum drying apparatus according to claim 1, wherein the blade is formed by meshing, and each crushing blade is provided with a plurality of protruding piece-like cutting blade portions protruding at equal intervals in the circumferential direction. The stirrer is formed by projecting a plurality of blade support shafts radially from a rotationally driven stirring shaft and providing a blade at the tip of the blade support shaft, and the blade is formed by a short ribbon-like plate. The vacuum drying apparatus according to claim 1 or 3. The vacuum drying apparatus according to claim 1, 3 or 4, wherein the drying kettle is heated from the outside of the drying kettle so that the inner wall of the drying kettle is heated. When the stirring shaft is driven to rotate and agitates with blades, the angle to crush the dumpling of the material to be dried, the angle to slowly push the material to be dried against the inner wall of the drying kettle, the angle to strongly press the material to be dried against the inner wall of the drying kettle, 6. The vacuum drying apparatus according to claim 5, wherein the blades are provided in such a manner that the blade angle is changed in order in the circumferential direction of the stirring shaft so that the material to be dried is scraped from the inner wall of the drying kettle.

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