JPH0322198B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a drum dryer having a dehumidifying function.

[Technical background of the invention]

Conventionally, this type of dryer sucks the humid air inside the drum through a duct from the front side of the drum using a blower fan and introduces the humid air into a heat exchanger fixedly installed inside the outer box. The air is cooled and dehumidified by outside air in the heat exchanger, and this dehumidified air is also guided through a duct into a heating chamber equipped with a heater and heated, and then from the heating chamber again into the drum from the front side, for example. It is configured to return.

[Problems with background technology]

However, in the above configuration, the drum, heat exchanger, and ducts that connect them to each other must be installed inside the outer box, which complicates the structure.
The problem is that the overall size of the outer box cannot be avoided, and that heat loss increases due to heat radiation from the duct.

[Purpose of the invention]

Therefore, an object of the present invention is to eliminate the need for a duct connecting the drum and the heat exchanger while obtaining the dehumidifying function of the heat exchanger, thereby simplifying the structure, reducing the overall size, and reducing heat loss. An object of the present invention is to provide a drum dryer that can reduce the amount of water.

[Summary of the invention]

In the present invention, an opening is formed in the back of the drum, and a casing is fixedly provided in the outer box so as to close the opening, and a heat exchanger is provided in the casing, and the air in the drum is By arranging and uniting the air blowing means that circulates the air through the heat exchanger and the heater that heats the circulating air that has been dehumidified by being cooled by the outside air in the heat exchanger, the air inside the drum is ducted. It is characterized in that it is directly introduced into the casing, dehumidified and heated, and then directly returned to the drum without going through the drum.

[Embodiments of the invention]

1 to 5 for the first embodiment of the present invention.
This will be explained based on the diagram. Reference numeral 1 denotes an outer box, and a short cylindrical peripheral wall portion 1a facing inward is formed approximately in the center of the front surface of the outer box, and the inside thereof is used as an entrance/exit 2 for the material to be dried;
This entrance/exit 2 is constructed so that it can be opened and closed by a door 3. 4 is a drum that stores the material to be dried;
A short cylindrical portion 4a with an open interior is formed at the center of the front surface, which is one side of this, and this short cylindrical portion 4a is rotatably supported on the outer periphery of the cylindrical peripheral wall portion 1a of the outer box 1 via a bearing 5. A circular opening 6 is formed in substantially the entire back surface, which is the other side, and a rearward-facing short cylindrical portion 4b is formed at the periphery of the opening 6. Reference numeral 7 denotes a disc-shaped casing, which is inserted into the short cylindrical part 4b on the back of the drum 4 via a bearing 8 to close the opening 6, and which is attached to a support provided on the back of the outer box 1. It is fixed inside the outer box 1 via a plate 9. The drum 2 is thus rotatably supported within the outer box 1 by the cylindrical peripheral wall portion 1a on the front surface of the outer box 1 and the casing.

Now, to explain the casing 7 and its surrounding structure, first, the casing 7 consists of a front case 10 that is approximately dish-shaped and a rear case 12 that is annular and has a circular opening 11 located slightly eccentrically downward from the center. The flange of the flange is placed front and rear against each other and integrated by screwing or the like. A bearing 13 is fixed to a portion of the front case 10 that corresponds to the center of the circular opening 11 of the rear case 12, and a plurality of intake ports 14 are formed around the bearing 13 to form a plurality of air intake ports 14 inside the center of the casing. is communicated with the inside of the drum 4. Also, front case 1
A discharge port 15 is formed at the top of the casing 7 to allow the upper part of the casing 7 to communicate with the inside of the drum 4.
Reference numeral 16 denotes a heat exchanger disposed within the casing 7, which in this embodiment is configured to also function as a blowing means for circulating the air within the drum 4, as will be understood from the description below. The heat exchanger 16 will be described in detail below with reference to FIGS. 3 to 5. Reference numeral 17 denotes a circular base plate made of aluminum, for example, which has a rearwardly extending surrounding wall 17a bent at its periphery and a circular trapezoid-shaped bulge 17b facing rearward approximately at the center. Reference numeral 18 denotes a large number of flat ventilation pipes made of a material with good thermal conductivity such as aluminum, with both ends extending toward the bulge 17b of the base plate 17, with the major diameter direction of the cross section oriented forward and backward. The base plate 17 is made to penetrate through the peripheral wall portion and the surrounding wall portion 17a of the base plate 17, respectively.
The ventilation pipes 18 are provided radially on the rear surface side, so that the ventilation pipes 18 can act as fan blades, and the ventilation pipes 18 can also serve as a fan blade.
The inside of 7b and the outer peripheral side of surrounding wall portion 17a are communicated with each other. Reference numeral 19 designates a large number of fin plates made of aluminum or the like, which have three grooves 19a that follow the outer shape of the ventilation pipe 18, as shown in FIG. The concave portions 19a on both sides are fitted into the axially intermediate portion of the ventilation pipe 18 to connect the adjacent ventilation pipe 1.
They are arranged in an annular shape on the rear surface side of the base plate 17 with the central concave portion 19a positioned between the grooves 8 and 18.
Reference numeral 20 denotes an annular wind guide plate, which is attached to the rear surface of the base plate 17 and is screwed to the base plate 17 at approximately the middle of the ventilation pipe 18 in the axial direction. The space between 18 is divided into an inner circumferential side and an outer circumferential side of the base plate 17, and is opened to the rear. Reference numeral 21 denotes a boss tube provided approximately at the center of the bulging portion 17b of the base plate 17, into which a shaft 22 is fitted. And heat exchanger 1 with such a configuration
6 has the front end of the shaft 22 pivotally supported by the bearing 13 of the front case 10, and the rear part of the shaft 22 is attached to the outer case 1.
By penetrating and pivotally supporting the bearing 23 provided on the support plate 9 of the front case 10, the inside of the bulging portion 17b is
It is rotatably disposed within the casing 7 so as to face the area where the air intake port 14 is formed. Reference numeral 60 denotes an annular seal, which is attached to the surrounding wall 17a of the base plate 17 and is slidably in contact with the inner peripheral edge of the circular opening 11 of the rear case 12. Reference numeral 24 denotes a heater, which is fixed to the front case 10 via a support member 24a in correspondence with the discharge port 15, and is integrated with the heat exchanger 16 in the casing 7. The so-called circulating air discharged from inside the casing 7 into the drum 4 is heated. still,
Reference numeral 25 denotes a filter frame provided on the front surface of the casing 7 to cover the intake port 14, and the ventilation port 25 formed in this
A filter 26 is installed in a section a to remove lint and the like from the air flowing into the casing 7 from inside the drum 1. Reference numeral 27 denotes a drain pipe that projects downward from the lowest part of the rear case 12 of the casing 7, and its lower end projects outside the machine from the bottom of the outer box 1. on the other hand,
28 is a motor fixed to the inner bottom of the outer box 1, and the rotating shaft 28a has first and second drive pulleys 29 and 3.
0 is fitted, a flat belt 31 is stretched between the first drive pulley 29 and the outer periphery of the drum 4,
A round belt 33 is stretched between the second driving pulley 30 and a driven pulley 32 fitted onto the rear end of the shaft 22 of the heat exchanger 16 . 34 is a back plate of the outer box 1, and near the center of this is a plurality of outside air inlets 35.
However, a plurality of outside air outlets 36 are formed on the outer peripheral side of this outside air inlet 35, respectively.

Next, the operation of the above configuration will be described. After putting the material to be dried into the drum 4 and closing the door 3, the motor 28
When the heater 24 is energized, the motor 28 rotates and the heater 24 generates heat. The rotation of the motor 28 rotates the drum 4 via a flat belt 31 to agitate the material to be dried inside, and at the same time, the shaft 22 and hence the heat exchanger 16 are rotated via a round belt 33. The rotation of the heat exchanger 16 causes the ventilation pipe 1 to
Since the air in the drum 8 flows in the radial direction due to centrifugal force, the air containing moisture in the drum 4 flows through the filter 2.
6 and the intake port 14 of the front case 10 into the bulging part 17b of the heat exchanger 16 in the casing 7, and flows through each ventilation pipe 18 to the outer peripheral side of the heat exchanger 16, that is, the casing 7. The air reaches the outer peripheral space, is heated as it passes through the heater 24, becomes hot air, and is immediately returned into the drum 4 through the air outlet 15 of the front case 10 (see arrow A in FIG. 1). The hot air discharged into the drum 4 removes moisture from the dried material therein, is sucked into the casing 7 again, and circulates as described above. On the other hand, on the rear side of the heat exchanger 16, the air between the ventilation pipes 18 also flows in the radial direction due to the centrifugal force accompanying the rotation of the heat exchanger 16, so the outside air flows through the outside air inlet 35 of the back plate 34.
From there, it flows into the rear side of the casing 7 inside the outer box 1 as indicated by arrow B in FIG.
The flow flows between the ventilation pipes 18 from the inner circumferential side of the wind guide plate 20 and flows in the radial direction between the ventilation pipes 18.
The air is discharged from the outside of the machine through the outside air outlet 36 of the back plate 34. Due to this circulation of outside air, the ventilation pipe 18 and the base plate 17 are cooled, and the humid air inside the drum 4 flowing inside the casing 7 is cooled, so that the air inside the drum 4 mainly flows inside the ventilation pipe 18. At this time, dew condenses on the inner circumferential surface of the air and dehumidifies it, and therefore, when it is discharged into the drum 4 from the air outlet 15 of the casing 7, it turns into dry warm air.
In this way, the material to be dried in the drum 4 can be effectively dried. Further, water condensed in the ventilation pipe 18 is shaken off from the outer peripheral end of the ventilation pipe 18 into the casing 7 by the centrifugal force accompanying the rotation of the heat exchanger 16, and flows downward along the inner peripheral wall of the casing 7 to the drain pipe 27. is ejected from the aircraft.

According to the above embodiment, the casing 7, which is a unit with the heat exchanger 16 and the heater 24, is arranged so as to close the opening 6 of the drum 4, so that the air inside the drum 4 can be removed. The air is drawn directly into the casing 7 from the intake port 14 without using a duct or the like, and after being dehumidified and heated, it is
The air can be returned directly into the drum 4 from the exhaust port 15. Therefore, there is no need for a complicated structure such as piping a duct inside the outer box 1 for the circulation of air inside the drum 4. The structure of the device can be significantly simplified, manufacturing costs can be reduced, and the overall size can be reduced. Furthermore, unlike the case where hot air is circulated through a duct, the hot air circulation path outside the drum 4 can be made as short as possible, so heat dissipation and hot air leakage can be minimized, and heat utilization can be improved. The drying efficiency can be improved, the power consumption of the heater 24 can be reduced, and the drying efficiency can be improved.

Furthermore, in this embodiment in particular, the heat exchanger 16 is constructed by radially disposing a large number of ventilation pipes 18 on a base plate 17, and by rotating the heat exchanger 16, centrifugal force is generated inside and outside the ventilation pipes 18. Since heat is exchanged between the air streams, the heat exchanger 16 can also be used as a blowing means, and there is no need to separately install blowers for hot air circulation and outside air.
This makes it possible to further simplify the structure and further reduce the size, particularly in the front-rear direction. Moreover, since the water condensed on the inner peripheral surface of the ventilation pipe 18 is immediately shaken off by centrifugal force, unlike conventional stationary heat exchangers, the water condensed on the heat exchange surface forms a thick water film and conducts heat. It is possible to prevent this from occurring, and as a result, it is possible to significantly improve heat exchange efficiency, perform efficient dehumidification, and further improve drying efficiency. In addition, heat exchanger 1
Since the fin plate 19 is provided at 6 and the concave portion 19a of the fin plate 19 is located between each ventilation pipe 18, airflow is effectively generated by these concave portions 19a, and the heat dissipation area is increased. However, further improvement in heat exchange efficiency can be expected. Furthermore, since the heat exchanger 16 is provided with a wind guide plate 20 and the space between the ventilation pipes 18 is divided into an inner circumferential side and an outer circumferential side and opened toward the rear, rotation of the heat exchanger 16 is prevented. Accordingly, when the air flows in the radial direction between the ventilation pipes 18, it is possible to prevent the air from coming out rearward from between the ventilation pipes 18 and flowing back toward the inner peripheral side, thereby making it possible to effectively generate airflow.

Next, a second embodiment of the present invention will be described with reference to FIG. Incidentally, the same parts as those in the first embodiment are given the same reference numerals and the explanation thereof will be omitted. In this embodiment, the casing 37 is composed of a case body 38 having a large diameter cylindrical shape with a bottom, and a rear plate 39 that covers the open rear surface of the case body 38. 40 is casing 3
This is a heat exchange plate which is a heat exchanger disposed in the case body 38, and this has a bottomed cylindrical shape with a diameter smaller than that of the case body 38, and the bottom portion is formed in a corrugated shape. The inside of the casing 37 is divided into two chambers: a hot air circulation chamber 37a and an outside air circulation chamber 37b. An inlet port 41 and an outlet port 42 are formed at approximately the center and the top of the case body 38 , facing the inside of the drum 4 , respectively, to communicate the warm air circulation chamber 37 a with the inside of the drum 4 . An inlet 42 and an outlet 4 are provided approximately at the center and near the outer periphery, respectively.
3 is formed to communicate the inside of the outside air circulation chamber 37b with the outside. Then, the exhaust port 4 of the case body 38
2 is provided with a heater 24 as in the first embodiment. 45 is a rotating shaft, which is the case body 38,
The heat exchange plate 40 and the rear plate 39 are rotatably supported by bearings 46, 47, and 48 provided at the center of each. Reference numeral 49 denotes a centrifugal blowing fan constituting the blowing means, which is positioned within the hot air circulation chamber 37a of the casing 37 and fitted onto the rotating shaft 45. Reference numeral 50 also designates a centrifugal blower fan, which is located within the outside air circulation chamber 37b of the casing 37 and fitted onto the rotating shaft 45. In this way, the heat exchange plate 40, the heater 24, and the blower fans 49, 50
The casing 37, which is made into a unit by arranging the casing 37, is fixed to the back of the outer box 1 via a support plate 51.

In the above configuration, when the motor 28 and the heater 24 are energized, the drum 4 and the blower fans 49, 50
rotates, and the heater 24 generates heat. Blower fan 4
Due to the rotation of 9, the air inside the drum 4 flows into the casing 3.
The hot air is drawn into the hot air distribution chamber 37a of the heat exchanger plate 4.
0, is heated by the heater 24, and is returned into the drum 4 through the exhaust port 15 (the sixth
(see arrow C in the figure), and on the other hand, the rotation of the blower fan 50 causes outside air to flow through the outside air inlet 35 of the back plate 34 and the rear plate 3.
The air is drawn into the outside air circulation chamber 37b of the casing 37 through the inlet 43 of No.
The outside air is discharged to the outside of the machine through the outside air outlet 36 of No. 4.
Due to such air flow, heat exchange is performed between the warm air inside the drum 4 and the outside air via the heat exchange plate 40, and the humid air inside the drum 4 is cooled, so that dew condensation occurs on the heat exchange plate 40. As a result, moisture is removed from the humid air in the drum 4, and the material to be dried is dried in the same manner as in the first embodiment. Even with this configuration, the duct for circulating the air inside the drum 4 can be made unnecessary as in the first embodiment, so the structure can be significantly simplified and the overall size can be reduced compared to the conventional configuration that requires a duct. In addition, heat loss can be prevented and drying efficiency can be improved.

In the second embodiment, the heat exchange plate 40 is fixed to the rear plate 39 of the casing 37.
If the peripheral edge of the heat exchange plate 40 is fixed to the back of the case body 38 to define the warm air circulation chamber 37a, the rear plate 39 can be omitted. In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and can be implemented with various modifications within the scope of the invention.

〔Effect of the invention〕

As described above, the present invention includes a casing that closes the opening formed in the back of the drum, and in the casing, a heat exchanger, a blowing means for circulating the air in the drum through the heat exchanger, and a heat exchanger. It is characterized by a unitized structure that includes a heater that heats the circulating air dehumidified by the exchanger, and as a result, the air inside the drum can be drawn directly into the casing without going through a duct. Dehumidify and
Since it is possible to heat the drum and return it directly into the drum without going through a duct, the duct can be made unnecessary, the structure can be made significantly simpler than before, and the overall size can be reduced, and heat loss can be reduced. It has the remarkable effect of being able to reduce the drying efficiency and improve the drying efficiency.

[Brief explanation of drawings]

1 to 5 show a first embodiment of the present invention, FIG. 1 is a longitudinal sectional side view of the whole, FIG. 2 is a rear view with the back plate removed, and FIG. 3 is a heat exchanger. 4 is a perspective view of the fin plate, FIG. 5 is a partially enlarged sectional view of the heat exchanger, and FIG. 6 is a view corresponding to FIG. 1 showing a second embodiment of the present invention. In the figure, 1 is the outer box, 4 is the drum, 6 is the opening,
7 and 37 are casings, 16 is a heat exchanger (air blowing means), 18 is a ventilation pipe, 24 is a heater, 40 is a heat exchange plate (heat exchanger), and 49 is a blowing fan (air blowing means).

Claims (1)

[Claims] 1. A drum for storing the material to be dried is rotatably provided in an outer box, and an opening is formed on one side of the drum, and a casing is fixedly placed in the outer box so as to close the opening. and a heat exchanger, a blowing means for circulating the air in the drum through the heat exchanger, and a circulating air that has been dehumidified by being cooled by outside air in the heat exchanger. A drum-type dryer characterized by being integrated into a unit with a heater for heating.