JPS62787A - Continuous drier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial application field This invention is directed to continuous drying of objects to be dried. Regarding drying equipment.

(b) Prior Art Conventionally, as a heat source for a continuous drying apparatus, it is known to incorporate a drying apparatus using an oil burner, an electric resistance as a heat source, or the like.

On the other hand, the present inventors have
In a series of subsequent inventions such as No. 7-19583, JP-A-57-55378 and JP-A-57-55379, and JP-A-5G-21185, a reduced pressure equilibrium heating method and a drying method or apparatus using the method, etc. proposed.

The basic technology is that the air inside a sealed hollow chamber is forcibly sucked in by the rotation of a rotating body and exhausted to the outside, reducing the pressure inside the room and keeping the pressure difference between the inside and outside at an approximately constant equilibrium state. and maintaining this equilibrium state, the rotating action of the rotating body is continued to promote frictional action with the air to generate frictional heat, and this frictional heat heats the inside of the hollow chamber. This method also involves forcibly suctioning the air in a sealed hollow chamber by the rotation of a rotating body and exhausting it to the outside, reducing the pressure in the chamber and keeping the pressure difference between the inside and outside in a substantially constant equilibrium state. The rotating action of the rotating body is continued while maintaining an equilibrium state to promote frictional action with the air to generate frictional heat, and this frictional heat heats the inside of the hollow chamber, and furthermore, manual or automatic operation is performed inside the hollow chamber. This is a reduced-pressure equilibrium heating method in which outside air is supplied through the air, and has the effect of consuming less energy such as electric power than conventional heating methods.

The present inventor also proposed a pressurized equilibrium heating method in Japanese Patent Application Laid-Open No. 57-127779, and found that if an exhaust port with a capacity lower than the exhaust capacity of the rotating body is provided for exhaust, the intake gas will be forced to be discharged to the outside. It has also been found that the compressor exhibits a kind of pressurizing effect, and therefore generates heat of compression, increasing the temperature more effectively and producing warm air.

The inventor further disclosed in Japanese Patent Application No. 126256/1982 "Hot Air Method and Apparatus" that a rotating body has a gas inlet and a gas outlet and rotates with a gas suction capacity larger than the gas suction amount of the gas inlet. A hollow body with an airtight structure,
Connect the gas outlet and gas inlet of each hollow body in sequence.
We proposed a method to create multiple hot air streams in succession. Further, in the same application, a plurality of rotating bodies having a gas intake and discharge capacity larger than the gas intake capacity of the gas intake port and/or the gas discharge capacity of the gas discharge port are included in a hollow body of an airtight structure having a gas intake port and a gas discharge port. We proposed a method to create hot air by connecting hollow bodies in series by sequentially connecting the gas outlet and gas inlet of each hollow body.

(c) Problems to be Solved by the Invention However, these conventional drying devices cannot necessarily be said to have good thermal efficiency. In addition, the evaporated organic solvent is discharged,
In order to reduce the amount of organic solvent vapor contained in the air and promote evaporation, it was necessary to exhaust the air using a separate fan.

On the other hand, in a reduced pressure equilibrium heating device, since heating is performed while reducing pressure, drying efficiency is better if the hollow chamber is sealed.

However, when the material to be dried is continuously dried in a line, the pressure inside the hollow chamber is reduced, so each time the material to be dried enters the hollow chamber, low temperature air under normal pressure outside the hollow chamber flows into the hollow chamber.
There was a problem inherent to the reduced pressure equilibrium heating device that the drying efficiency was likely to decrease.

(D) Means for Solving Problems This invention has a gas inlet and a gas outlet, rotates with a gas suction capacity greater than the gas suction capacity of the gas inlet, and rotates while maintaining a constant pressure equilibrium state. A vacuum heating heat generating device consisting of a hollow body with an airtight structure having a rotating body that generates heat due to rotational action in the rotating region of the body, and having a gas inlet opening into a drying chamber, a pressure regulating chamber attached to the drying chamber, and a pressure regulating chamber. It consists of a drying chamber and a line provided so that the material to be dried passes through the drying chamber in sequence.
1 (e) Operation When the rotating body of the decompression heating and heat generation device is driven, gas in the drying chamber is sucked in and the gas flows into the hollow body on the side of the air intake port.

At this time, the opening area of the gas inlet is set to be less than the gas suction capacity of the rotating body installed in the corresponding hollow body, or the opening area of the gas inlet is also limited to be smaller than the opening area of the gas outlet, so the rotating body The amount of gas sucked in is smaller than the gas discharged by the hollow body, and the pressure in the rotation region R of the rotating body is reduced compared to other parts, and the pressure in the hollow body as a whole is also reduced. The pressure difference between the rotation region R and other parts, and the pressure difference between the hollow interior and the outside air will gradually increase, but when they reach the pressure difference, they will be approximately balanced in relation to the gas flowing into the vicinity of the rotation region R. condition is reached and this constant pressure condition is maintained. The pressure difference between the inside and outside of the rotating region R in this equilibrium state and constant pressure state is determined by the magnitude of the rotational suction and exhaust force of the rotating body, the size of the opening area of the gas inlet, the size of the minute gap g, etc. This equilibrium, constant pressure state is maintained as long as the rotating action of the rotating body continues. In this equilibrium state, a gas stagnation phenomenon occurs in the rotating region R of the rotating body, and frictional action continues repeatedly between the rotating body and the stagnant gas, so that frictional heat is generated and the temperature gradually rises. The warm air heated by this frictional heat passes through a small gap g and is discharged from the gas outlet to the outside of the hollow body.If the opening area of the gas outlet is set to a smaller exhaust capacity than the exhaust capacity of the rotating body, the hollow body Since the gas sucked into the exhaust gas is forcibly discharged to the outside, a kind of pressurizing effect is exerted at the gas outlet, which generates heat of compression, making it possible to further increase the exhaust temperature.

The material to be dried is sequentially guided into the drying chamber through the pressure regulating chamber, dried within the drying chamber, and after drying is transported from the drying chamber to the outside through the pressure regulating chamber.

(F) Embodiment FIG. 1 shows a plan view of an embodiment of the present invention, FIG. 2 shows a view A in FIG. 1, FIG. 3 shows a cross section in the B direction in FIG. 1, and FIG. Fig. 4, Fig. 5 showing an outline of the operation of the embodiment, and Fig. 6 showing a partially enlarged view of Fig. 5.
7, which shows a partially enlarged view of another embodiment, and FIG. 8, which shows a partially sectional view of another embodiment.

(1) is a drying chamber which is a hollow chamber. The drying chamber (1) consists of a box shape that can be sealed. (2) is an intake port, and (3) is an exhaust port. Both the intake port (2) and the exhaust port (3) are in the drying chamber (1).
). (4) is an intake path, and (5) is an exhaust path, which are continuous from the intake port (2) and the exhaust port (3), respectively. The intake passage (4) and the exhaust passage (5) form a heat exchange mechanism in the middle. (6)a and (6)b are hollow bodies having an airtight structure. Each hollow body has two gas inlets (7)a, (7)b, and two gas outlets (8)a, (8)b, which have a larger opening area than the gas inlets (7)a, (7)b. It has two openings. The gas inlet (7)a of the hollow body (6)a on the intake side is connected to the intake path (
4), and the gas outlet of the hollow body (6)b on the exhaust side (
8)b is connected to the exhaust path (5), and the hollow body (6) on the intake side
The gas outlet (8) a of a is connected to the gas inlet (7) b of the hollow body (6) b on the exhaust side via the box (9) a. Two hollow bodies may be connected as shown in Figure 2, but
Box (9) a, as in the other embodiment shown in FIG.
(9) Three or more groups may be connected via b.

(10)a, (10)b, and (10)c are rotating bodies,
It consists of rotating blades such as propeller fans and sirocco fans. The rotating bodies (10) a, (10) b, (to) c are equipped with electric motors (11) a, (11) b, respectively installed in each hollow body.
(11)c, gas inlet (7)a, (7)b, (7)
It can be rotated in a direction that allows gas to be sucked in from c and discharged from the gas outlet. Electric motor (11)a, (11)b
, (11)c are driven by the supplied current. Main parts such as the covers of the electric motors (11)a and (11)bl(11)c are made of heat-resistant materials such as ceramics. As heat-resistant treatment means, electric motors (11)a, (11)b, (1
1) C may be covered with a material having low thermal conductivity.

By applying heat-resistant treatment, even if higher temperatures occur, it is possible to prevent the motor from overheating and obtain higher temperatures.

g is the minute gap formed between the inner wall of the hollow body (6)a, (6)b, (6)c and the rotating body (10)a, Cl0)b, (1'0)c, R is the rotating body This is the rotation area of Gas inlets (7)a, (7)b, (7) formed in each hollow body
The gas suction port is designed such that the gas suction capacity of the rotating bodies (10,) a, (10) b, and (10) C installed in the corresponding hollow body during normal rotation is greater than the gas suction capacity of the rotary body c. It is necessary to set the opening areas of (7)a, (7)b, and (7)c.

In this embodiment, a gas outlet (
8) a, (8) b, (8) C (7) From the gas exhaust capacity, the rotating body (tO) a, (1
The opening area of the gas exhaust port (8) is set so that the gas exhaust capacity during normal rotation of 0)b and (to)c is greater.

In the embodiments shown in FIGS. 1 to 6 and 7, the capacity of each rotating body (10) decreases from the intake port side to the exhaust port side.

That is, in this embodiment, the adjacent electric motors (11)a, (11)b, and (11)c that rotate each rotating body are controlled so that a smaller load current is taken on the exhaust side than on the intake side.

The inventor also found that when hollow bodies are arranged in multiple stages and the rotating bodies installed in each hollow body are rotated by motors connected in parallel, the exhaust side electric motor draws a smaller load current than the intake side electric motor. This is because it has been found that even if the load current is controlled to take the same load current, the heat generation drying efficiency is the same as when the load current is controlled to be taken. As a control means, between adjacent electric motors,
A means to make the capacity of the electric motor on the exhaust side smaller than that on the intake side,
Alternatively, when adjacent electric motors have the same capacity, there is a method of supplying a smaller current to the exhaust side than to the intake side.

In this embodiment, each electric motor (11)a, (11)
b and (11) c are set to have the same capacity, and between adjacent motors, the current supplied to the motor on the exhaust side is controlled to be smaller than that to the motor on the exhaust side. The current is reduced by providing a bypass in the motor circuit that reduces the current. It is possible to use other electric motors as the resistors provided in the bypass.

Boxes (9)a, (9)b are each hollow body (6)a, (
6) Gas outlet ports (1, 2) a, (12) b with adjustable opening area are provided in an air-tight structure between the gas outlet ports and the gas inlet ports of (6) b and (6) c. , (12)cl(12
)d, (12)e.

(12) Open f. The total opening area of the gas discharge ports of each rotating box is formed to be smaller than the gas discharge capacity of each hollow body. (13)a, (13)b, and (13)c are adjustment plates having a concentric opening at the center. Adjustment plate (13)
A, (13)b, and (13)c are each bolted to the gas inlet of the hollow body, but other methods may be used as long as they are detachable. Further, it may be possible to attach and detach it by remote control from outside the drying chamber (1).

The rotating bodies (10)a, (10)b, and (10)c are connected to a clutch (14) by an electric motor (11)d outside the drying chamber (1), as shown in FIG. 8 showing another embodiment. It may be driven by a shaft (15) having a. In this case, since the electric motor is installed outdoors, even if a high temperature is generated, the electric motor will not be overheated, and it will be possible to generate a higher temperature.

Furthermore, in addition to the electric motor, other motive power, such as an internal combustion engine such as a gasoline engine, or an external combustion engine may be used. The power may be driven directly or via a transmission means such as a V-belt.

At both ends of the drying chamber (1) are pressure regulating chambers (16)a to (1).
6) (2 is provided. In this embodiment, the pressure regulating chambers (16) a to (16) Q are composed of two rows and three stages at each end. Each of the pressure regulating chambers (16) a to (16) 12 border and drying room (1
) side and outside air side door (17)a to (1)
7) It has p. In this embodiment, the doors (17)a to (17)p are made of sliding doors, and are provided so as to be openable and closable for each pressure regulation chamber, and each pressure regulation chamber can be hermetically sealed.

The door may also be used as a horizontally adjacent pressure regulating chamber, so that when one door is closed, the other door is open. If the door is configured to pass through the normal pressure side from the frame or support of the pressure regulating chamber, the door (17)a... will be drawn to the depressurized drying chamber (1) side, so the door ( 17) a...
... is in close contact with the frame, etc., making it possible to create a more airtight condition.

(18) is a line, and (19) is an object to be dried that moves on the line (18).

In this embodiment, each material to be dried (19) is connected to a line (18).
Although it can be directly suspended from the line, it can also be moved on a line via a trolley. The material to be dried (19) is mounted so as to move on the line at regular intervals.

The line (18) moves at a constant speed in the direction of the arrow, in front of the pressure regulating chamber entrance (C) on the entrance side to the drying chamber (1) and in the drying chamber (
It is possible to branch off at the outlet side (E) of the pressure regulating chambers from 1), and to carry the materials to be dried (19) into the adjacent rows of pressure regulating chambers in different ways. The line (18) is also divided into two lines, after passing through the pressure regulating chamber (D) and (P
), and the material to be dried (19) is conveyed at an interval before separation.

゛Interval Ql between each dried material (19) before separation and after merging
is longer than each length ρ3 of the pressure regulating chamber (16)a...
The interval Q between the dried objects (19) after separation is longer than the length of the two pressure regulating chambers +23x2. At least the length Q3 of the pressure regulating chamber needs to be longer than the length of the object to be dried.

In this example, 12. =4, C3=8.12s=3. As a result, the doors of the pressure regulating chambers that are continuous in the direction of line movement are not opened at the same time, and the drying chamber (L)
It is possible to minimize temperature reduction and pressure rise inside the tank. Furthermore, if the opening/closing speed of each door (17)a is increased, the effect will be further improved. A fan or the like may be used to communicate air between a pressure regulating chamber that becomes a reduced pressure state at a certain point and a pressure regulating chamber that becomes a normal pressure state. With this configuration, it is possible to reduce losses due to pressure increase and temperature decrease when changing from a reduced pressure state to a normal pressure state or from a normal pressure state to a reduced pressure state.

Furthermore, a pressure-reducing equilibrium heat generating device may be independently installed in the pressure regulating chamber, but in that case, it is necessary to ensure that the suction and exhausting power of the reduced pressure equilibrium heat generating device installed in the drying chamber is not obstructed.

Therefore, the reduced pressure equilibrium heating device is driven. That is, when each electric motor is driven with adjustment plates (13)a, (13)b, and (13)c removed from each gas inlet, gas such as air is
From the intake port (2) through the intake path (4), there is a drying room (1)
The gas inside is mixed and flows into the hollow body (6)a on the side of the most air intake port through the gas intake port (7)a.

At this time, the opening area of the gas inlet (7)a is less than or equal to the gas suction capacity of the rotating body (10)a installed in the corresponding hollow body (6)a, and the opening area of the gas inlet (7)a is Since the opening area is limited to be smaller than the opening area of the exhaust port (8) a, the amount of gas sucked in is smaller than the gas discharged by the rotating body (10) a, which prevents the rotation of the rotating body (10) a. In region R, the pressure is reduced compared to other parts, and the pressure of the hollow body as a whole is also reduced. The pressure difference between the rotational region R and other parts and the pressure difference between the hollow interior and the outside air gradually increases, but at the point when the pressure difference reaches the pressure difference, the relationship with the gas flowing into the vicinity of the rotational region R: - A substantially equilibrium state is reached and this constant pressure state is maintained. In this equilibrium state and constant pressure state, the pressure difference inside and outside the rotation region R is:
This equilibrium and constant pressure state is determined by the magnitude of the rotational suction and exhaust force of the rotating body (10) a, the size of the opening area of the gas inlet (7) a, the size of the minute gap g, etc. This is maintained as long as the rotational action of the body (10)a continues.

In this equilibrium state, air stagnation occurs in the rotational region R of the rotating body (10)a, and the frictional action continues to be repeated between the rotating body (10)a and the accumulated gas, so frictional heat is generated and the temperature gradually increases. rises. The warm air heated by this frictional heat passes through a small gap g and is discharged out of the hollow body from the gas discharge port (8) a. The opening area of the gas outlet (8) a is the same as that of the rotating body (1
0) If the exhaust capacity is set to be smaller than the exhaust capacity of the hollow body (6) a, the gas sucked into the hollow body (6) a will be forcibly discharged to the outside. It exhibits a kind of pressurizing effect and is accompanied by the occurrence of compression ripening, making it possible to further increase the exhaust temperature. Other hollow bodies (6) b, (
6) A similar effect is performed on c. Hollow body (6)a,
(6) A part of the gas discharged from b is transferred to the swirl box (
9)a, (9)b and further the gas outlet of the rotating box (12)a, (12)b, (12)c, (1
2) d, (12) e.

(12) f is discharged into the drying chamber (1), and
) for heating and drying. Therefore, the exhaust side of each hollow body is not overheated, and the time required to raise the temperature inside the drying chamber (1) is shortened.

When the hollow body reaches a reduced pressure equilibrium state, the adjusting plate (13
)a, (13)b, and (13)c are made to be solid, and each gas inlet (7)a, (7)b, and (7)c is made to have a small diameter. Even if the supplied current is reduced at the same time, heat generation continues in the same way.

This seems to be because even under reduced pressure equilibrium, inhaling through a gas inlet with the same diameter as Moe causes loss.

Gas outlet (12)a, (12)b, (12)c,
'(1,2)d, (12)e, and (12)f may be opened depending on temperature conditions, etc., and gas may not be discharged.

The gas that is not discharged into the drying chamber (1) passes through the exhaust passage (5), exchanges heat with the intake gas on the way, and is then exhausted from the ii port (3). The exhaust port may combine exhaust from two or more hollow bodies.

When the temperature inside the drying chamber has risen to the desired temperature, the line (1
8) to sequentially send out the items to be dried.

At point 0, the objects to be dried are sequentially distributed to the left and right, and the intervals between the objects to be dried become wider. Therefore, it is possible to shorten the distance between the objects to be dried running on the line without impairing the function of the pressure regulating chamber, increasing the drying efficiency. It becomes possible to increase the running speed.

When the object to be dried (19) approaches, the door is opened to allow outside air to flow into the pressure regulating chamber and to welcome the object to be dried (19). When the material to be dried (19) enters the pressure regulating chamber, the door is closed and the next door is opened. By sequentially opening and closing the door, the object to be dried (19) enters the drying chamber (1) and moves while being dried.

The dried material to be dried (19) is divided into two parts again at point E, exits to the outside air side by sequentially opening and closing the doors, and joins again at point F.

(G) Effects of the Invention Therefore, according to the present invention, it is possible to perform efficient drying and continuous drying while maintaining the reduced pressure heating state generated by the reduced pressure heating heat generating device.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a view A in FIG. 1, FIG. 3 is a sectional view B in FIG. 6 is a partially enlarged view of FIG. 5, FIG. 7 is a partially enlarged view of another embodiment, and FIG. 8 is a partially sectional view of another embodiment. It is. (1)...Drying room, (2)...Intake port, (3)...Exhaust port, (4)...
・・Intake path, (5) ・・・Exhaust path, (6) a, (6) b, (6) c---・−+ hollow body, (
7) a, (7) b, (7) c...---gas inlet,
(8)a, (8)b, (8)c---gas outlet, (9)a, (97?, (9)C---box, (10)a, ( 10)b, (10)C------
・Rotating body, (ll) a, (11) b, (l l ) c
----Electric motor, (L2) a, (12) b, (12
)c, (1,2)d, (12)el(12)f-...
・-Gas exhaust port, (H)a, (13)b, (13)c...g straightening plate, (14)...clutch, (15)...
...shaft, (16) a, (16) b, (16) c,
(16) d, (16) e, (16) r, (16) g. (16)h...pressure control chamber, (17)a, (17)b, (17)c, (17)
d, (17)e, (17)L (17)g. (17) h, (17) i, (17) j, (17) k, (
17) f2, (17) m, (17) n, (17) o, (
17)p...door, (18)...line, (19)...material to be dried.

Claims (2)

[Claims] (1) A rotating body that has a gas inlet and a gas outlet, rotates with a gas suction capacity greater than the gas suction capacity of the gas inlet, and generates heat due to rotational action in the rotating region of the rotor while maintaining a constant pressure equilibrium state. It consists of a hollow body with an airtight structure and has a gas inlet opening into the drying chamber, a pressure regulating chamber attached to the drying chamber, and a material to be dried that passes through the pressure regulating chamber and the drying chamber in sequence. A continuous drying device characterized by comprising a line provided in the. (2) The continuous drying apparatus according to claim 1, wherein the pressure regulating chamber includes a plurality of pressure regulating chambers.