JP3874935B2 - Heating dryer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat dryer suitable for use in the treatment of food residues, sludge and other high water content.
[0002]
[Prior art]
In general, as a treatment device for food residues and the like, a heating dryer mainly including a heating bowl with a jacket is known. In particular, vacuum heating dryers that make the inside of a heating basket a reduced pressure (vacuum) state and promote the drying of the contents by heating are generally widely used. An example thereof will be described with reference to FIG. 6. R is a cylindrical heating rod, and this heating rod R is configured by forming a jacket J as an outer cylinder on the outer peripheral portion of the inner cylinder S.
[0003]
A rotating shaft Z having a stirring blade Y radially attached to the center thereof is passed through the inner peripheral portion of the heating bowl R, and the contents such as food residues can be stirred by the stirring blade Y by the rotation of the rotating shaft Z. It is like that. In particular, the rotary shaft Z is configured as a hollow heat pipe through which a heat medium such as heating steam is passed, and a plurality of bypass pipes H that dissipate heat by distributing the heat medium from the rotary shaft Z around it.・ Are provided in parallel.
[0004]
And according to this kind of heat dryer, while depressurizing the inner peripheral part of the heating rod R with a vacuum pump, the heating medium is respectively supplied between the inner cylinder S and the jacket J and from the rotating shaft Z to the bypass pipe H. The contents can be supplied and subjected to heat drying treatment, and the treated product can be reused as feed or fertilizer.
[0005]
[Problems to be solved by the invention]
However, according to the conventional heat dryer, since the bypass pipes are connected to and communicated with the rotary shafts, the heating medium can be supplied from the rotary shafts to the bypass pipes. Since the internal pressure of the bypass pipe is higher and the centrifugal force acts on each bypass pipe due to the rotation of the rotation shaft, the heat medium stays in each bypass pipe and the circulation thereof is impaired. Therefore, even if the temperature of the heat medium is decreased due to heat absorption by the contents of the heating rod, the replacement does not proceed, so that the heat efficiency is very poor, and a lot of processing time has been required.
[0006]
The present invention has been made in view of the circumstances as described above. The object of the present invention is to use a heat-efficient heating dryer in which the heat medium smoothly circulates, and to quickly heat and dry food residues and the like. It is to be able to do in.
[0007]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides a heat dryer in which a rotating shaft is passed through an inner peripheral portion of a heating bowl, and the rotating shaft is connected to a heat source at one end, and a heating medium is supplied to the inside. A series of flow in which the heat medium circulates by dividing the inside by a partition in order from one end side and connecting the both ends of bypass pipes arranged in parallel along the rotation axis to each area. A heating dryer characterized in that a passage is formed and a discharge pipe is provided from the recovery chamber toward the outside of the heating tank, with the area inside the rotating shaft connected to the end of the flow path as a recovery chamber. Is to provide. In particular, according to the second aspect of the present invention, a discharge pipe is provided inside the rotary shaft, and the residue of the heat medium such as drain can be discharged outside the machine through the discharge pipe.
[0008]
Further, in the invention of claim 3, as a more preferable aspect, a rotating structure in which a stirring blade is attached to the inner peripheral portion of a double-layered heating rod in which a jacket is formed on the outer peripheral portion of the inner cylinder whose both ends are closed. In the heating and drying machine having a shaft passing therethrough, the rotary shaft is formed into a hollow heat pipe having one end connected to a heat source and supplied with a heat medium therein, and the inside is partitioned by a partition in order from one end side. A series of flow paths through which the heat medium flows are formed by connecting both ends of a bypass pipe arranged in parallel along the rotation axis to each of the areas, and an area inside the rotation shaft to which the end of the flow path is connected The present invention provides a heating dryer characterized in that a recovery pipe is provided as a recovery chamber and a discharge pipe is provided from the recovery chamber through the inside of the rotary shaft to the outside of the heating bowl.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, application examples of the present invention will be described in detail with reference to the drawings. First, FIG. 1 shows a system diagram of a heat dryer according to the present invention. In the figure, reference numeral 1 denotes a heating rod of a heating dryer installed in a horizontal state. The heating rod 1 includes a cylinder 2 having a predetermined volume and a jacket 3 as an outer cylinder formed on the outer periphery of the cylinder. Consists of. Reference numeral 4 denotes a rotating shaft that penetrates from one end side to the other end side of the central portion of the heating rod 1, and this rotating shaft 4 is connected to a drive source (not shown) and rotated forward and backward.
[0010]
Here, a heating medium is supplied to both the inner and outer sides of the heating bowl 1, that is, the inner side of the inner cylinder 2 and between the inner cylinder 2 and the jacket 3, and the contents of the heating bowl 1 (processed product) by the action of the heating medium. ) Can be dried by heating. In addition, 5 is a hopper for throwing a processed material into the inside of the heating bowl 1, and its opening can be opened and closed by a pressure lid 6. B is a boiler as a heat source. Heating as a heat medium from the boiler B to the inner cylinder 2 and the jacket 3 through the pipe 7 and to the inside of the inner cylinder 2 through the pipe 8 branched from the pipe 7 is performed. Steam is supplied.
[0011]
In particular, the pipe 8 is connected to one end of the rotary shaft 4 via a rotary joint (not shown) so that heated steam can be introduced into the inner peripheral portion of the heating rod 1 through the rotary shaft 4. That is, the rotating shaft 4 is configured as a hollow heat pipe into which heated steam is introduced.
[0012]
Reference numeral 9 denotes a discharge pipe that passes through the rotary shaft 4, and the discharge pipe 9 discharges the condensed water inside the rotary shaft 4 to the outside of the heating rod 1. Reference numeral 10 denotes a pipe connected to the discharge pipe 9 via the above-described rotary joint, and this pipe 10 is joined to a pipe 11 for discharging jacket steam drain. P is a vacuum pump for depressurizing the inside of the heating bowl 1, m is a pressure gauge indicating a depressurized state by the vacuum pump P, and V is opened when the internal pressure exceeds a threshold value to heat the outside air. According to the heating dryer provided with these devices, the contents of the heating basket 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 exhaust processing.
[0013]
Next, FIG. 2 shows a cross section perpendicular to the axis of the heating rod. As is apparent from this figure, the rotating shaft 4 is composed of a cylindrical cored bar 12 and a sleeve 13 provided concentrically at a predetermined interval around the cored bar. Is attached. The stirring blade 14 is composed of an arm pipe 15 communicating with the inside of the rotary shaft 4 and a blade 16 having a predetermined shape facing the inner wall surface of the heating rod 1 at the tip thereof, and stirs the processing object by the rotation of the rotary shaft 4. On the other hand, the processed material contacting 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 rotating shaft 4 between the stirring blades 14 so that the heating steam is supplied from the rotating shaft 4 to the bypass pipes 17A to 17C. It has become.
[0014]
As apparent from FIG. 3, the bypass pipes 17 </ b> A to 17 </ b> C are provided in parallel along the rotation shaft 4, and both ends thereof are connected to the portion of the rotation shaft 4. In addition, 18 is a branch pipe which connects each center part of bypass pipe 17A-17C and the rotating shaft 4. FIG.
[0015]
Here, FIG. 4 shows the internal structure of the rotating shaft. As is apparent from this figure, the inside of the rotating shaft 4 is divided into a plurality of rooms 20A, 20B,... Then, a series of flow paths 21 through which heated steam flows are formed by connecting both ends of the bypass pipes 17A to 17C to the respective areas (the rooms 20A to 20D).
[0016]
In the flow path 21, a through hole 22 formed in the center of the core metal 12, a horizontal hole 23 opened from the through hole 22 toward the outer peripheral surface of the core metal 12, and the horizontal hole 23 communicate with each other in the order in which the heating steam flows. The room 20A, the bypass pipe 17C having one end connected to the room 20A, the room 20D to which the other end of the bypass pipe 17C is connected, the bypass pipe 17A having one end connected to the room 20D, and the other end of the bypass pipe 17A are connected The room 20B and a bypass pipe 17B having one end connected to the room 20B, and the room 20C to which the other end of the bypass pipe 17B is connected are shown in FIG. 1 as a collection room for collecting drain. One end of the discharge pipe 9 is introduced.
[0017]
As clearly shown in FIG. 5, the discharge pipe 9 is passed through the through hole 22 of the cored bar 12 in the rotating shaft 4 leaving a predetermined gap t so as not to impair the flow of the heating steam, and is a room serving as a recovery chamber. A nozzle 24 for sucking the condensed water inside the room is attached to one end introduced into 20C, and the other end of the discharge pipe 9 is led to the outside of the heating rod 1 through the inside of the rotary shaft 4. Then, the pipe 10 is connected to the end portion through the rotary joint as described above.
[0018]
Here, one end of the rotating shaft 4, that is, one end of the through hole 22 formed in the cored bar 12 is connected to the boiler B as a heat source through the pipe 8 or the like as described above. Since sealing is performed between the discharge pipe 9 and the packing 25, the heated steam supplied from the boiler B does not directly pass through the room 20C, but flows into the bypass pipe 17C from the side hole 23 through the room 20A. In addition to the bypass pipes 17A to 17C, the arm pipe 15 of the stirring blade 14 is also individually communicated with the rooms 20A to 20D of the rotary shaft 4, but the condensed drain here becomes heated steam flowing in the flow path 21. Since it is carried to the room 20 </ b> C, the drain does not stay inside each arm pipe 15.
[0019]
In FIG. 5, reference numeral 26 denotes a sealing lid that closes the opening portions at both ends of the inner cylinder 2, 27 denotes a gasket that is attached to a portion of the sealing lid 26 that penetrates the rotating shaft 4, and 28 supports the rotating shaft 4 to be rotatable. Among them, a screw conveyor (not shown), for example, is passed through the sealing lid 26 as means for discharging the processed material on one end side of the heating rod 1. The blades 16 of the stirring blades shown in FIG. 2 and the like have a predetermined gradient so that the processed material can be fed to the screw conveyor side by reversing the rotating shaft 4 when the processed material is dried. It is.
[0020]
Here, the operation of the present application (vacuum) heating dryer configured as described above will be described. First, the pressure lid 6 shown in FIG. 2 is opened, and, for example, a food residue is put into the heating basket 1 as a processed product from the hopper 5. Then, after the opening of the hopper 5 is sealed with the pressure lid 6, the inside of the heating rod 1 is reduced to a predetermined pressure by the operation of the vacuum pump P. Also, before and after this, heating steam is supplied from the boiler B to both the inside and outside of the heating rod 1 while rotating the rotary shaft 4 in a predetermined direction by the operation of a drive source (not shown), The rotating shaft 4 and the bypass pipes 17A to 17C and the stirring blades 14 connected to the rotating shaft 4 are heated.
[0021]
As a result, the processed product is gradually dried while contacting the arm pipe 15, the rotating shaft 4, the inner wall surface of the heating rod 1, and the bypass pipes 17 </ b> A to 17 </ b> C while being stirred by the stirring blade 14. The heated steam aggregates and becomes drainage by heat exchange at this time, and the drain on the jacket 3 side is discharged outside the apparatus through the pipe 11 shown in FIG. On the other hand, on the rotating shaft 4 side, a circulating flow of heated steam is formed, and the condensed drain is carried on the steam flow and collected in the room 20C at the end of the flow path 21 and through the discharge pipe 9 Discharged outside.
[0022]
In this way, the heated steam flows smoothly through the flow path 21, and the old and new are constantly replaced in the circulation cycle. For this reason, the wall surfaces of the rotating shaft 4 and the bypass pipes 17A to 17C are kept at a constant temperature. The processed product can be dried to a predetermined moisture content in a short time. It is to be noted that no power is required for discharging the drain through the discharge pipe 9, and the drain collected in the room 20C can be guided to the inside of the discharge pipe 9 by the vapor pressure acting on the room 20C.
[0023]
As mentioned above, although the suitable example of this invention was demonstrated based on drawing, the heat dryer which concerns on this invention is not restricted to the above structures, For example, the thing which is not equipped with the jacket 3 and the vacuum pump P may be used. Further, instead of providing the rotating shaft 4 with the stirring blade 14, it is also possible to make the heating rod 1 a rotary drum and attach a spiral blade instead of the stirring blade 14 to the inner wall surface thereof. Furthermore, the bypass pipes 17 </ b> A to 17 </ b> C are not limited to being provided in parallel around the rotating shaft 4 at intervals of 120 degrees, but about 2 to 6 may be provided in parallel at equal intervals. In this case, the number of compartments inside the rotating 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 the two bypass pipes is connected to a predetermined area of the rotating shaft 4 as an inlet and an outlet, and two other ends are shared. Since the number of bypass pipes is N, the inside of the rotating shaft 4 is substantially divided into (N + 1) number of rooms.
[0024]
The discharge pipe 9 is preferably piped inside the rotary shaft 4 as described above. However, the discharge pipe 9 may be guided to the outside along the outer periphery of the rotary shaft 4. Furthermore, although heating steam is used as the heat medium in the above example, hot water, for example, can be used instead of the heating steam.
[0025]
【The invention's effect】
As is clear from the above description, according to the heat dryer according to the present invention, the inside of the rotating shaft configured as a heat pipe is partitioned in order from one end side by a partition wall, and each area is along the rotating shaft. 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, and the area inside the rotating shaft to which the end of the flow path is connected serves as a recovery chamber from the recovery chamber to the outside of the heating rod. Since the exhaust pipe is installed, the heat medium does not stay in the bypass pipe, etc., and is smoothly circulated and exchanged, so the heat efficiency is good, and the heat quantity keeps the bypass pipe and the wall surface of the rotating shaft at a constant temperature. Processed food residues and other processed products with high moisture content can be efficiently dried.
[0026]
In addition, since the discharge pipe extends through the rotating shaft to the outside of the heating bowl, it is not necessary to secure the equipment area on the inner periphery of the heating bowl, and the discharge pipe rotates inside the heating bowl. Since it does not protrude from the shaft, there is no clogging of the processed material in the heating basket, and consequently, the diffusion of a strange odor due to the stagnant state 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 bowl constituting the heating dryer. FIG. 3 is a side view of a rotating shaft passed through the heating bowl. 4] Partial sectional view of the rotating shaft partially broken. [FIG. 5] Partial sectional view of one end of the heating bowl. [FIG. 6] Cross sectional view of a conventional heating dryer.
DESCRIPTION OF SYMBOLS 1 Heating rod 2 Inner cylinder 3 Jacket 4 Rotating shaft 9 Discharge pipe 14 Stirring blade 17A, 17B, 17C Bypass pipe 19 Partition 20A, 20B, 20C, 20D Room 21 Flow path

Claims (3)

In a heat dryer in which a rotating shaft is passed through an inner peripheral portion of a heating bowl, the rotating shaft is a hollow heat pipe having one end connected to a heat source and supplied with a heat medium therein, and the inside of the rotating shaft is A partition wall is divided in order from the side, and a series of flow paths through which the heat medium flows is formed by connecting both ends of a bypass pipe arranged in parallel along the rotation axis to each section, and the end of the flow path is A heating dryer comprising an area inside the rotating shaft to be connected as a recovery chamber and a discharge pipe provided from the recovery chamber toward the outside of the heating basket. The heat dryer according to claim 1, wherein a discharge pipe is provided inside the rotary shaft. In a heat dryer in which a rotating shaft having a stirring blade attached is passed through an inner peripheral portion of a double-layered heating rod formed by forming a jacket on the outer peripheral portion of an inner cylinder whose both ends are closed, the rotating shaft Is a hollow heat pipe with one end connected to a heat source and supplied with a heat medium inside, and the inside is divided into partitions in order from one end side, and arranged in parallel along the rotating shaft in each area A series of flow paths through which the heat medium flows are formed by connecting both ends of the bypass pipe, and the area inside the rotating shaft to which the end of the flow path is connected serves as a recovery chamber from the recovery chamber through the inside of the rotating shaft. A heating dryer characterized by being equipped with a discharge pipe that reaches the outside of the heating bowl.

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