JP2000018826A - Heating drier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform the heat and dry treatment for food leftovers in a short time, by providing a heating drier excellent in heat efficiency where a heating medium circulates smoothly. SOLUTION: A rotary shaft 4 passing the center of a heating can is constituted as a hollow heat pipe which receives the supply heating steam from a boiler, with its one end connected to this boiler. Moreover, the inside of the rotary shaft 4 is divided into a plurality of rooms 20A, 20B, 20C, and 20D in order by bulkheads 19 from the side of its one end, and a chain of passages 21 where a heat medium circulates are made by connecting both ends of bypass pipes 17A, 17B, and 17C juxtaposed along the rotary shaft 4 to each room 20A-20D. Then, a discharge pipe 9 is installed toward outside of the heating can 1 from the room 20C where the terminal of the passage 21 is connected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating and drying machine suitable for treating food residues, sludge, and other highly hydrated substances.

[0002]

2. Description of the Related Art In general, a heating dryer mainly comprising a jacketed heating can is known as an apparatus for treating food residue and the like. In particular, vacuum heating dryers in which the inside of a heating can is decompressed (vacuum) to facilitate heating and drying of the contents are widely used. An example thereof is described with reference to FIG. 6, where R is a cylindrical heating can, and this heating can R is formed by forming a jacket J as an outer cylinder on the outer periphery of an inner cylinder S.

[0003] At the center of the inner periphery of the heating can R is a stirring blade Y
Are radially attached, and the rotation of the rotation axis Z causes the contents such as food residues to be stirred by the stirring blade Y.
So that it can be stirred. In particular, the rotation axis Z is configured as a hollow heat pipe through which a heat medium such as heating steam passes, and a plurality of bypass pipes H,. Are provided in parallel.

According to this type of heating and drying machine, while the inner peripheral portion of the heating canister R is depressurized by the vacuum pump, the heating and drying device is connected between the inner cylinder S and the jacket J and from the rotation axis Z to the bypass pipe H respectively. The contents can be heated and dried by supplying a heat medium, and the treated product can be reused as feed or fertilizer.

[0005]

However, according to the above-described conventional heating and drying machine, since the bypass pipes are connected to the rotary shafts and communicate with each other, the heating medium can be supplied to each bypass pipe from the rotary shafts. However, since the internal pressure of the rotary shaft is higher than the internal pressure of each bypass pipe, and the centrifugal force acts on each bypass pipe by the rotation of the rotary shaft, the heat medium stays inside each bypass pipe and its circulation is impaired. There was a disadvantage. Therefore, even if the temperature of the heating medium decreases due to heat absorption by the contents of the heating can, the exchange does not proceed, so that the heat efficiency is very poor.
Until now, a lot of processing time has been required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heat-drying machine having a high heat efficiency through which a heat medium smoothly flows, and a heat-drying process for food residues and the like. In a short time.

[0007]

In order to achieve the above-mentioned object, the present invention provides a heating dryer having a rotating shaft penetrating the inner periphery of a heating can, wherein the rotating shaft has one end connected to a heat source. A hollow heat pipe into which a heat medium is supplied, the inside of which is divided by a partition wall in order from one end side, and both ends of a bypass pipe arranged side by side along the rotating shaft in each section are connected. A series of flow paths through which the heat medium flows are formed, and a discharge pipe is provided from the recovery chamber to the outside of the heating can from the recovery chamber as an area inside the rotary shaft connected to the end of the flow path. It is intended to provide a heating / drying machine characterized by being constituted. In particular, according to the second aspect of the present invention, the discharge pipe is provided inside the rotary shaft so that the residual heat medium such as drain can be discharged outside the machine through the discharge pipe.

In a third aspect of the present invention, a stirring blade is attached to the inner periphery of a double-structured heating can in which a jacket is formed on the outer periphery of an inner cylinder whose both ends are closed. In the heating dryer having the rotating shaft penetrated, the rotating shaft is a hollow heat pipe one end of which is connected to a heat source and a heating medium is supplied to the inside, and the inside is sequentially partitioned by a partition from one end side. Along with dividing, by connecting both ends of a bypass pipe arranged in parallel with each section along the rotation axis to form a series of flow paths through which the heat medium flows, the end of the rotation axis to which the end of the flow path is connected is formed. The present invention provides a heating / drying machine characterized by comprising a discharge pipe extending from the collection chamber to the outside of the heating can through the inside of the rotating shaft to the outside of the heating can using the internal area as a collection chamber.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, FIG. 1 shows a system diagram of a heating dryer according to the present invention. In FIG. 1, reference numeral 1 denotes a heating can of a heating dryer installed horizontally.
Is composed of a cylinder 2 having a predetermined volume and a jacket 3 as an outer cylinder formed on the outer periphery of the cylinder. Reference numeral 4 denotes a rotating shaft which is a central portion of the heating can 1 and penetrates from one end thereof to the other end thereof. The rotating shaft 4 is connected to a driving source (not shown) and is rotated in reverse.

Here, a heating medium is supplied to both the inner and outer sides of the heating can 1, that is, inside the inner cylinder 2 and between the inner cylinder 2 and the jacket 3, and the contents of the heating can 1 are operated by the action of the heating medium. (Processed material) can be dried by heating. Reference numeral 5 denotes a hopper for charging the processed material into the heating can 1, and
The opening can be opened and closed by a pressure lid 6. B is a boiler as a heat source.
Heated steam as a heat medium is supplied to the space between the inner cylinder 2 and the jacket 3 through a pipe 7 and to the inside of the inner cylinder 2 through a pipe 8 branched from the pipe 7.

In particular, the pipe 8 is connected to one end of the rotating shaft 4 via a rotary joint (not shown) so that heated steam can be introduced into the inner peripheral portion of the heating can 1 through the rotating shaft 4. That is, the rotating shaft 4 is configured as a hollow heat pipe into which heated steam is introduced.

Reference numeral 9 denotes a discharge pipe passing through the rotary shaft 4, and the discharge pipe 9 discharges the drain aggregated inside the rotary shaft 4 to the outside of the heating can 1. Reference numeral 10 denotes a pipe connected to the discharge pipe 9 via the above-described rotary joint. The pipe 10 is joined with a pipe 11 for discharging a drain of jacket steam. P is a vacuum pump for depressurizing the inside of the heating can 1, m is a pressure gauge indicating a depressurized state by the vacuum pump P, and V is open when the internal pressure exceeds a threshold to release outside air. According to the heating / drying machine provided with these devices, the contents of the heating can 1 can be dried by the heat medium and the pressure reducing action by the vacuum pump P. Here, the vacuum pump P is connected to a separator or an aeration tank (not shown) so as to perform an exhaust process.

Next, FIG. 2 shows a cross section perpendicular to the axis of the heating can.
As is apparent from this figure, the rotating shaft 4 is a cylindrical core 12
And a sleeve 13 provided concentrically at a predetermined interval around the periphery thereof, and a stirring blade 1
4 are mounted radially. The stirring blade 14 is composed of an arm pipe 15 communicating with the inside of the rotating shaft 4 and a blade 16 having a predetermined shape at the tip thereof and facing the inner wall surface of the heating can 1. In addition, the processing object in contact with the arm pipe 15 can be heated by the heating steam introduced into the arm pipe 15 from the rotating shaft 4. A plurality of bypass pipes 17A, 17B, and 17C are provided around the rotary shaft 4 between the stirring blades 14 so that the heating steam is supplied from the rotary shaft 4 to the bypass pipes 17A to 17C. Has become.

As is apparent from FIG. 3, the bypass pipes 17A to 17C are provided in parallel along the rotating shaft 4, and both ends thereof are connected to the portion of the rotating shaft 4. Reference numeral 18 denotes a branch pipe that connects each central portion of the bypass pipes 17A to 17C and the rotary shaft 4.

FIG. 4 shows the internal structure of the rotating shaft.
As is clear from this figure, the inside of the rotating shaft 4 is divided into a plurality of rooms 20A, 20B,... And each area (each room 20A ~
20D) is connected to both ends of the bypass pipes 17A to 17C to form a series of flow paths 21 through which the heated steam flows.

The flow path 21 has a through hole 22 formed in the center of the core 12 in the order of flow of the heating steam, a lateral hole 23 opened from the through hole 22 toward the outer peripheral surface of the core 12, and a lateral hole 23.
20A, a bypass pipe 17C having one end connected to the room 20A, a room 20D to which the other end of the bypass pipe 17C is connected, a bypass pipe 17A having one end connected to the room 20D, and another end of the bypass pipe 17A. Is connected to the room 20B, and a bypass pipe 17B having one end connected to the room 20B. A room 20C connected to the other end of the bypass pipe 17B is a collection chamber for collecting the drain. One end of the discharge pipe 9 shown in FIG.

As apparent from FIG. 5, the discharge pipe 9 is passed through the through hole 22 of the cored bar 12 in the rotating shaft 4 with a predetermined gap t so as not to impair the flow of the heated steam. A nozzle 24 for sucking the agglomerated drain inside the room is attached to one end for introducing into the room 20C, and the other end of the discharge pipe 9 is guided to the outside of the heating can 1 through the inside of the rotary shaft 4. I will The pipe 10 is connected to the end via the rotary joint as described above.

Here, one end of the rotating shaft 4, that is, the core 1
2 is connected to the boiler B as a heat source through the pipe 8 and the like as described above.
Of the other end is sealed by the packing 25 with the discharge pipe 9, so that the heated steam supplied from the boiler B does not directly flow into the room 20C, but flows into the bypass pipe 17C from the horizontal hole 23 through the room 20A. Will do. Further, in addition to the bypass pipes 17A to 17C, the arm pipes 15 of the stirring blades 14 are also individually connected to the respective chambers 20A to 20D of the rotary shaft 4. Since the boat is carried to the room 20C, the drain does not stay inside each arm pipe 15.

In FIG. 5, reference numeral 26 denotes a sealing cover for closing both ends of the inner cylinder 2, reference numeral 27 denotes a gasket attached to a portion of the sealing cover 26 through the rotary shaft 4, and reference numeral 28 denotes a rotatable rotary shaft 4. For example, a screw conveyor (not shown) is passed through the hermetic lid 26 as a means for discharging the processed material at one end side of the heating can 1. The blades 16 of the stirring blade shown in FIG. 2 and the like are provided with a predetermined gradient. By rotating the rotating shaft 4 at the end of the drying process of the processed material, the processed material can be sent to the screw conveyor side. It is.

Here, the operation of the present invention (vacuum) heating / drying machine configured as described above will be described. First, the pressure lid 6 shown in FIG. 2 is opened, and a food residue, for example, a food residue is charged from the hopper 5 into the heating can 1. After closing the opening of the hopper 5 with the pressure lid 6, the inside of the heating can 1 is reduced to a predetermined pressure by the operation of the vacuum pump P. Further, before and after this, heating steam is supplied from the boiler B to both inside and outside of the heating can 1 while rotating the rotating shaft 4 in a predetermined direction by operation of a driving source (not shown), The rotating shaft 4 and the bypass pipes 17A to 17C and the stirring blade 1 connected thereto.
Heat 4

As a result, the processed material is gradually dried while being agitated by the agitating blades 14 while being in contact with the arm pipe 15, the rotating shaft 4, the inner wall surface of the heating can 1 and the bypass pipes 17A to 17C. The heat exchange at this time causes the heated steam to aggregate and form a drain, and the drain on the jacket 3 side is discharged outside the machine through the pipe 11 shown in FIG. On the other hand, on the rotating shaft 4 side, a circulating flow of the heated steam is formed, and the agglomerated drain rides on the steam flow and is all collected in the room 20C at the end of the flow path 21, and is discharged through the discharge pipe 9. It is discharged outside.

As described above, the heated steam flows smoothly in the flow path 21 and the old and new are constantly replaced in the circulation cycle. Therefore, the rotating shaft 4 and the bypass pipe 17A
The processed material can be dried to a predetermined moisture content in a short time while keeping the wall surface of ~ 17C constant. No power is required for discharging the drain by the discharge pipe 9, and the drain collected in the room 20C can be guided into the discharge pipe 9 by the vapor pressure acting on the room 20C.

As described above, a preferred example of the present invention has been described with reference to the drawings. However, the heating / drying apparatus according to the present invention is not limited to the above-described configuration. Absent. Further, a stirring blade 14 is provided on the rotating shaft 4.
, The heating can 1 may be a rotary drum, and a spiral blade instead of the stirring blade 14 may be attached to the inner wall surface. Furthermore, bypass pipes 17A to 17
The three Cs are not limited to being provided in parallel around the rotary shaft 4 at 120-degree intervals, and two to six Cs may be arranged at equal intervals. In this case, the number of sections inside the rotary shaft 4 is increased or decreased according to the number of bypass pipes. That is, in order to form a series of flow paths, one end of each of two bypass pipes is independently connected to a predetermined area of the rotary shaft 4 as an inlet and an outlet, and two other ends are commonly used. To the same area, the rotation axis 4
Is substantially divided into (N + 1) rooms.

It is preferable that the discharge pipe 9 is provided inside the rotary shaft 4 as described above. However, the discharge pipe 9 may be guided outside the machine along the outer circumference of the rotary shaft 4. Further, in the above-described example, the heating steam is used as the heat medium. However, for example, hot water can be used instead of the heating steam.

[0025]

As is apparent from the above description, according to the heating / drying apparatus of the present invention, the inside of the rotating shaft constituted as a heat pipe is divided from one end side by a partition in order, and each section is divided into the respective sections. A series of flow paths through which the heat medium flows is formed by connecting both ends of the bypass pipes arranged side by side along the rotation axis, and the area inside the rotation shaft connected to the end of the flow path is used as a collection chamber from the collection chamber. Since the exhaust pipe is installed outside the heating can, the heat medium does not stay inside the bypass pipe, etc.
Since it is smoothly circulated and exchanged, the heat efficiency is good, and the heat amount can keep the wall surface of the bypass pipe and the rotating shaft in a constant temperature state, so that food residues and other processed products having a high moisture content can be efficiently dried.

Further, since the discharge pipe is extended to the outside of the heating can through the inside of the rotating shaft, it is not necessary to secure the equipment area on the inner periphery of the heating can, and the discharge pipe is used for the heating can. Since it does not protrude from the rotating shaft inside, there is no clogging of the processed material in the heating can, and furthermore, the diffusion of an unpleasant odor due to the accumulation can be prevented.

[Brief description of the drawings]

FIG. 1 is a system diagram of a heating dryer according to the present invention.

FIG. 2 is a cross-sectional view perpendicular to the axis of a heating can constituting a heating dryer.

FIG. 3 is a side view of a rotating shaft passed through a heating can.

FIG. 4 is a partial cross-sectional view showing the rotation shaft partially broken away;

FIG. 5 is a partial sectional view showing one end of the heating can.

FIG. 6 is a cross-sectional view showing a conventional heat dryer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating can 2 Inner cylinder 3 Jacket 4 Rotating shaft 9 Discharge pipe 14 Stirrer blade 17A, 17B, 17C Bypass pipe 19 Partition wall 20A, 20B, 20C, 20D Room 21 Flow path

Continued on the front page F term (reference) 3L113 AA07 AB05 AC04 AC05 AC15 AC24 AC40 AC44 AC45 AC46 AC58 AC63 AC67 AC73 AC77 AC87 BA01 BA37 CA10 DA05 DA10 DA19 4D059 AA01 AA02 AA03 AA07 AA08 BD11 BD12 BD19 BD21 BJ03 BJ14 CB07 CA01 CA01

Claims (3)

[Claims] 1. A heating dryer in which a rotating shaft penetrates an inner peripheral portion of a heating can, wherein the rotating shaft is a hollow heat pipe having one end connected to a heat source and a heating medium supplied to the inside. The interior is partitioned by a partition in order from one end side, and a series of flow paths through which the heat medium flows is formed by connecting both ends of a bypass pipe arranged side by side along the rotation axis to each area, A heating / drying machine characterized by comprising an exhaust pipe extending from the collection chamber to the outside of the heating can from the collection chamber using a region inside the rotary shaft connected to the end of the flow path as a collection chamber. 2. The heating and drying machine according to claim 1, wherein the discharge pipe is provided inside the rotary shaft. 3. A heating dryer having a rotating shaft with a stirring blade attached to the inner periphery of a double-structure heating can having a jacket formed on the outer periphery of an inner cylinder having both ends closed. In, the rotating shaft is a hollow heat pipe one end of which is connected to a heat source and a heating medium is supplied to the inside, and the inside of the rotating shaft is sequentially partitioned from one end side by a partition wall, and the rotating shaft is provided in each section thereof. A series of flow paths through which the heat medium flows is formed by connecting both ends of bypass pipes arranged side by side along a line, and the area inside the rotary shaft connected to the end of the flow path is used as a recovery chamber to rotate from the recovery chamber. A heating dryer comprising a discharge pipe which reaches the outside of the heating can through the inside of a shaft.