JPH02229501A - Dryer - Google Patents

Abstract

PURPOSE:To selectively use the dryer by providing a filter case to a material housing and furnishing a rotary filter body freely attachably, detachably and rotatably in the filter case. CONSTITUTION:A granular material is charged into a material passage 5 between an inner cylinder 3 and an outer cylinder 4 from the material passage 5a of the material housing 1 through a supply source 12. The air sent to an air supply passage 3a in the inner cylinder 3 is heated by a heater 7 to form hot air, and the hot air is introduced into the material passage 5 from many small holes 3b of the inner cylinder 3 to dry the material. The waste gas is introduced into the filter case 20 from many small holes 4b of the outer cylinder 4 through exhaust passages 9 and 9a and discharged to the outside of the system as one pass by the action of the rotary filter body 40. Alternatively, the waste gas is returned to a gas supply chamber 22 and circulated. As a result, the air passage can be widened, the draft resistance is reduced, and the amt. of hot air is increased.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a method for drying materials such as synthetic resin materials, processed food materials, etc., before supplying them to a processing machine such as a molding machine. This invention relates to a drying device for preheating and drying the material to be dried. [Prior Art] A hopper dryer is generally known as this type of drying device. This homper dryer consists of a hopper, which is a material storage body for storing material to be dried, and a blower and a heater, which are attached to the hopper and serve as a drying gas supply source. This is a one-pass type in which the heated and dried air is supplied from the bottom of the hopper into the hopper to dry the material inside the hopper, and the exhaust gas is discharged from the top of the hopper to the outside of the system through an exhaust filter. Alternatively, a circulation type is known in which the exhaust gas that passes through the exhaust filter is returned to the blower via a circulation filter and circulated. [Problems to be Solved by the Invention] However, according to the above-mentioned conventional example, (a) Regardless of whether the exhaust gas treatment method is a one-bath type or a circulation type, the exhaust filter or circulation filter is used exclusively. However, one filter did not have the role of the other filter. (0) Also, given the above configuration, it was not possible to selectively use the exhaust gas between the one-pass type and the circulation type by switching the exhaust filter or circulation filter. It is also possible to install a switching valve at one point in the circulation type exhaust gas treatment circuit and use it selectively between the one-pass type and the circulation type, but in this case, in addition to the switching valve, a circulation filter is required. There were some difficulties, such as an increase in the number of This invention aims to provide a drying device that solves these problems by providing a rotating filter body. [Means for Solving the Problems] In order to achieve the above object, the present invention provides a drying material storage body with a filter case having a gas supply chamber and a gas exhaust chamber, and a rotating The filter body is detachably and rotatably provided, and the flow direction of exhaust gas discharged from the gas exhaust chamber can be arbitrarily changed by rotationally displacing the rotary filter body. Various specific configurations of the filter case and rotating filter body can be adopted and are arbitrary. For example, the gas supply chamber and the gas exhaust chamber of the filter case communicate with each other, and a gas inlet is provided on the side wall of the gas exhaust chamber, and a pair of gas inlet ports are provided on the inner wall of the gas exhaust chamber at approximately diametric positions. The rotating filter body includes at least a filter element stretched around the cylindrical outer periphery, and a bipartition partition provided in the internal space of the filter element and having a single cross-section that divides the filter element into two. a pair of seal plates that protrude above the filter element so as to substantially face the center of the two-part partition plate, and are positioned by positioning ridges formed in the gas exhaust chamber of the filter case. Furthermore, the gas exhaust chamber of the rotating filter body can be covered with a filter lid, and by engaging the pair of seal plates with the pair of positioning protrusions, the gas exhaust chamber of the rotating filter body can be discharged from the drying material storage body. While a one-pass path is formed in which the exhaust gas is discharged to the outside of the system via the filter element of the rotary filter body, by further rotationally displacing the pair of seal plates, the exhaust gas discharged from the drying material storage body is It is also possible to form a circulation path so as to return to the gas supply chamber via a filter element of a rotating filter body without passing through the one-pass path. The pair of seal plates can be configured to allow exhaust gas to pass through both the one-pass path and the circulation path by rotationally displacing them to arbitrary angular positions. It is preferable that the filter case and the rotary filter body be provided with display means such as a display scale for displaying the rotation angle of the rotary filter body so that the rotation angle of the rotary filter body can be reliably positioned.

It is preferable to form a pressurized air introduction hole in the filter case to prevent clogging of the filter element of the rotating filter body, and to attach a pressurized air means to this pressurized air introduction hole. The drying material storage body for storing the material to be dried may be any conventionally used material storage body, but in this embodiment, the following structure is adopted. That is, the material storage body to be dried includes an inner cylinder having an air supply passage communicating with the gas supply chamber of the filter case and a large number of small holes, and a material passage formed between the inner cylinder and having a large number of small holes. A heater is suspended in the inner cylinder, and an exhaust passage communicating with the gas exhaust chamber of the filter case is formed between the outer cylinder and the outer case. Near the gas exhaust chamber of the filter case, there is a slide damper that can open and close the gas exhaust chamber, or a cover plate is placed above the tip of the slide damper and the entrance of the gas exhaust chamber to cover both. It is possible to adopt a structure in which the cover plate is fixed and an exhaust hole is formed in this cover plate so that it can communicate with the inlet of the gas exhaust chamber. [Function] According to the present invention, by rotationally displacing the rotary filter body, the flow direction of the exhaust gas from the drying material storage body can be arbitrarily changed. For example, when the rotary filter body is placed at the 0 degree position, all of the exhaust gas discharged from the drying material storage body forms a one-pass path through which it is discharged to the outside of the system via the filter element of the rotary filter body ( (See FIGS. 1, 2, and 7) Next, when the rotary filter body is rotated to the maximum allowable angle and arranged, all of the exhaust gas does not pass through the one-pass path. By forming a circulation path that returns only to the gas supply chamber via the filter element (see Figures 3 and 4), by rotating the rotary filter body by an arbitrary angle between the 0 degree position and the maximum angle. ,
The exhaust gas can be made to pass through both the one-pass route and the circulation route in a desired amount (for example, 20% to the one-pass route, 80% to the circulation route, or other appropriate ratio).
(See FIGS. 5 and 6) [Embodiment] An embodiment of the present invention will be described below based on FIGS. 1 to 16.

(8) shown in FIGS. 12 to 14 is a drying device called a hopper dryer, and this drying device (A)
consists of a drying material storage body (hopper) (l) for storing the material to be dried, and a filter unit (2).

The material storage body {1} to be dried can have any configuration as described above. However, in this embodiment, the drying material storage body (1) has an air supply path (3a) that communicates with the gas supply chamber of the filter case (20), and
A material passage (5) is formed between the inner cylinder (3), which has many small holes (3b) on the outer periphery and a tapered tip, and the inner cylinder (3), and a large number of small holes (4b). A heater (7) such as a sheathed heater is installed inside the inner cylinder (3) via a heat conductive cylinder (6).
} is hanging. In addition, the outer case (8) has a double wall structure consisting of an inner case (8a) and an outer case (8b), and a heat insulating space (8C) is provided between the inner case (8a) and outer case (8b). It is forming. An exhaust passage (9) communicating with the gas exhaust chamber Q of the filter case (20) is formed between the inner case (8a) and the outer cylinder (4).
The upper casing (l^) of the drying material storage body (1) has an air supply formed from an air source 01 such as a blower installed outside the drying material storage body (1) toward the heat conduction tube (6). airway (
1a), a material passageway (5a) that communicates with the material passageway (5) formed by the inner cylinder (3) and the outer cylinder (4) above, and the exhaust passageway (9) and the filter case. Exhaust chamber Q3
It has an exhaust passage (9a) that communicates with the exhaust gas passageway (9a). The upper casing (IA) also has the heater (
7), the inner cylinder (3), and the outer cylinder (4).
) are fixed. The support plate OI1 connects the air supply path (l
a), and the inner cylinder (3) is connected to the air supply path (1a).
The outer cylinder (4) is connected to the side wall of the opening of the material passage (5a) and hangs downward by being attached to the side wall of the opening of the material passageway (5a) with screws or retaining rings. Note that it is convenient to clean the inner cylinder (3) and the outer cylinder (4) if the inner cylinder (3) and the outer cylinder (4) are detachably installed in the upper casing (IA). The material passage (5a) of the upper casing (l^)
) above the material supply sources such as hoppers, collectors, and transport pipes (
) are connected. In addition, a drying material storage body (1
) is a tapered lower casing (1B
) is connected to the lower casing (IB), and the material is supplied from the material outlet αl of this lower casing (IB) to a receiving part of a synthetic resin molding machine or the like connected to the material outlet αl. 041 is a gas vent hole, 09 is a control panel attached to the drying material storage body fl+, Ol is a sambling ring, and αη is a handle. According to the dried material storage body 1) 1 having the above-mentioned configuration, the powdered material is passed through the material supply source side by a pneumatic transportation device, etc., and then from the material passage (5a) of the dried material storage body (1) to the inner cylinder (3). The material passage (5) between the and outer cylinder (4) is filled. On the other hand, the air supply path (3a) in the inner cylinder {3} passes from the air source OI to the gas supply chamber (sha) of the filter case (to) and the air supply l (Ia) of the drying material storage body (1). ) is heated by the heater (7) to become hot air, and the hot air is passed through the many small holes (3b) of the inner cylinder (3) to the material passage (5). The exhaust gas is passed through the numerous small holes (4b) of the outer cylinder (4), through the exhaust passages (9) and (9a), and into the filter case (to be described later). By the action of the rotating filter body, it is either discharged out of the system as a single bath, returned to the gas supply room and circulated, or discharged in arbitrarily set amounts to the single bath route and the circulation route. When such a drying material storage body (1) is used, the material passage (
5) is formed into a donut shape, and a heat hole (7) is provided in the center of the material passage (5) to discharge hot air for drying radially from the center layer of the inner cylinder (3) toward the outer layer. Compared to conventional models, the ventilation area is wider, the ventilation resistance is reduced, and hot air can be increased. Therefore, the temperature of the material increases quickly, and the drying time is dramatically shortened. Also,
Drying equipment. The structure of the housing is a cylinder with the heater (7) in the center, and when the upper part is removed, the inner cylinder (3) and the outer cylinder (4) are all removed, making it easy to disassemble and clean, making it easy to replace materials. This is convenient if you do it frequently. Furthermore, since the heater (7) is placed in the center, compared to a case where the heater (7) is placed on the outer circumferential surface, the amount of material stored in the same drying material storage body is larger. ．Filter unit (
2) is the air supply path (1a) at the top of the drying material storage body (1)
It consists of a filter case (end) fixed to the side with a fastening member (D) such as a bolt, and a rotating filter body (1) installed inside the filter case (2) so that it can be attached/detached and rotated freely. The filter case Q has a gas supply chamber that communicates with the air supply path (1a) of the material storage body to be dried (1) and an exhaust path (9a) of the material storage body to be dried (1). A gas exhaust chamber (c) is formed so that the two companies communicate with each other, and a gas inlet Q4 is provided on the side wall on the side of the gas exhaust chamber (to) to take in gas such as outside air. The gas exhaust chamber (
A pair of positioning protrusions 4 are provided at approximately the diameter position of the inner wall of the
(24) is installed on the side wall of the gas supply chamber Q, and an air source such as a propeller is installed on the side wall. (loa) is the impeller of the air source, and (10b) is the motor.
The air source OI is not limited to this structure. The rotating filter body 1 has a substantially cylindrical overall shape, and includes at least a serrated filter element Žυ stretched around the outer periphery of the cylinder, and provided in the internal space of the filter element 10, and A temporary two-part partition lIa having an L-shaped cross section that bisects the filter element +10, and a temporary two-part partition lIa protruding above the filter element @υ so as to be substantially opposite to the center part (42a) of the temporary two-part partition @, and the filter case (self)
A pair of seal plates are positioned by positioning protrusions formed in the gas exhaust chamber (self) of the rotary filter body, and the gas wandering chamber (end) of the rotary filter body is further provided with a ! Hinge @9 on the outside wall of the gas exhaust chamber 1231
It can be covered with a filter lid that can be opened and closed. By engaging the pair of seal plates @3, @3 with the pair of positioning protrusions (C), (C), the exhaust gas discharged from the drying material storage body +1 is transferred to the rotary filter body. A one-pass path (A) is formed to discharge the air out of the system via the first filter element -υ (see Figures 1 and 2).
By further rotationally displacing the pair of seal plates @3, the exhaust gas discharged from the material storage body to be dried (+1) passes through the rotary filter body @3 without passing through the one-pass path (A). It is configured to form a circulation path (d) so as to return to the gas supply chamber (self) via the filter element @D (see Figs. 3 and 4). In this configuration, the exhaust gas can only choose one of the one-pass route (A) and the circulation route i01.Therefore, by providing not only one pair of the positioning protrusions (5) but also a large number of them, one pair of positioning protrusions (5) can be selected. By rotationally displacing the seal plates ■ and @l to arbitrary angular positions, it is also possible to configure the exhaust gas to pass through both the one-bus path (a) and the w1 ring path (l) at an appropriate ratio. ．The means for positioning the seal plate @ field is not limited to the positioning protrusion (c), but the design can be changed to other means. The filter case (end) and the rotating filter body @ field are
As shown in Figure 7, it is better to form a display scale or other display means (self) for displaying the rotation angle of the rotating filter body 6@. A pressurized air introduction hole is formed in the filter case (self) to prevent clogging of the filter element @υ of the rotating filter body, and a pressurized air means +21) is formed in this pressurized air introduction hole. It is preferable to install During this pressurized air means Q, in this embodiment, as shown in FIG. 1, FIG. 3, and FIG. (28a)... is adopted, but it is not limited to this. Furthermore, if dehumidified air is used as pressurized air, it can be used as drying air and at the same time, the dew point temperature of the material to be dried can be lowered. (47) is a flange, (
48) is the packing. [Modifications, etc.] Inlet (2) of the gas exhaust chamber (to) of the filter case (self)
3a) Nearby, as shown in Figs. 17 to 22, there is a slide damper (30) that can open and close the population (23a) of the gas exhaust chamber (to).
30), the entrance (23) of the gas exhaust chamber (to) is opened.
The flow rate of exhaust gas introduced from a) can be adjusted and a sealing effect can also be achieved. (30a
) is the slide damper (30) knob, (30b)
is the tip. 00 is Slide Dunbar (30
) to the filter case (to) using the guide plate of the fastening member (3).
1a) It is fixed at . Further, the tip (30b) of the slide damper (30)
Above the entrance (23a) of the gas exhaust chamber (to), there is a covering plate 0~ that covers both (30b) and (23a).
It is fixed with fastening members o3 such as screws and butterfly bolts, and this cover plate (self) has an inlet (23a) of the gas exhaust chamber Q wharf.
Exhaust holes (to) and (b) are formed to allow communication with the exhaust hole. In general, (a) if the material to be dried contains high-moisture evaporated gas or organic gas that condenses into tar, these will be adsorbed to the filter element (filter cloth),
Not only does the impregnation cause clogging and reduce the filter function (dust collection function), but the drying air volume also decreases, resulting in poor drying efficiency.

In addition, in the case of materials to be dried that contain explosive components such as solvents, using the present invention, the exhaust gas should be made into a full circulation (all one-pass path), but the exhaust gas may be mistakenly turned into a full circulation or a one-pass path. When there is partial circulation, there is a risk of explosion due to the above explosive components circulating. Therefore, with the above configuration, the entire inlet (23a) of the gas exhaust chamber (2@) of the filter case (toward) is closed with the slide damper (30), and the exhaust gas discharged from the drying material storage body (1) is blocked. Said exhaust hole (b)
By discharging from the system only from (b), all of the problems mentioned in (b) above can be completely solved.

When using a rotating filter body, the shape and structure of the filter element @0 are not limited to those described above, and the design can be changed as appropriate. Further, the means for positioning the rotating filter body @Shi at any angle is not limited to the above-mentioned positioning protrusion (self) and seal plate @l, and can be changed arbitrarily. Although the filter unit (2) was applied to a dryer in the embodiment, it can also be applied to a box type dryer or other drying equipment. [Effects of the Invention] The present invention provides a drying material storage body with a filter case having a gas supply chamber and a gas exhaust chamber, and a rotary filter body provided in the filter case so as to be detachable and rotatable. Since the flow direction of the exhaust gas discharged from the gas exhaust chamber can be arbitrarily changed by rotating the rotary filter body, the following effects can be obtained.
In other words, (1) By simply rotating and displacing the rotary filter body, one-pass type, circulation type, or a combination of both types can be selected and used, with the exhaust gas being removed by the filter element. (2) Exhaust gas can be treated by setting both of them arbitrarily, for example, 20% in one bus route, 80% in circulation route, etc., so exhaust gas and fresh supply gas can be mixed. The concentration can be set as required, and the material can be dried to a desired moisture content as a drying gas.

(3) Furthermore, since one filter element can be used for the one-pass type, circulation type, or a combination of both as described above, there is no need to use dedicated filters for each type as in the conventional example, and there are fewer components. Become. Therefore,
A compact filter unit can be realized.

[Brief explanation of the drawing]

All figures show examples of the present invention. Fig. 1 is a cross-sectional view of the filter unit showing the full one-pass path state, Fig. 2 is a front view of the rotating filter body of Fig. 1, and Fig. 3 is a cross-sectional view of the filter unit showing the full circulation path state. 4 is a front view of the rotating filter body shown in FIG. 3, FIG. 5 is a cross-sectional view of the filter unit showing a combination of one-pass path and VTI ring path, and FIG. 6 is a front view of the rotating filter body shown in FIG. 5. Fig. 7 is an exploded perspective view of the filter unit, Fig. 8 is a cross-sectional view of the rotating filter body, Fig. 9 is a sectional view of the upper and lower seal plates, Fig. 10 is a right side view of Fig. 8, ) is a cross-sectional view of the rotating filter body, Figure 12 is a partially longitudinal front view of the filter UniSoto applied to a swimming soap dryer, Figure 13 is a right side view of Figure 12, and Figure 14 is a cross-sectional view of the rotating filter body. Figure 12 is the plan view, Figure 15 is the first
FIG. 16 is a right side view of FIG. 15, FIG. 17 is a perspective view of another modification of the filter case, and FIG. The figure is a longitudinal sectional view of Fig. 17, Fig. 19 is a sectional view taken along line A-A of Fig. 17, Fig. 20 is a front view of the slide damper, Fig. 21 is a right side view of Fig. 20, and Fig. 22 is a rear view of a tentative guide. (1)... Material storage body to be dried, (1a), (3a).
... Air supply path, (2) ... Filter unit, (3)
...Inner cylinder, (4)...Outer cylinder, {5), (5a)...
・Material passage, (7)...Heater, (9), (9a)・
...Exhaust path, Ql...Air source, (to)...Filter case, @...Gas supply chamber, 1...Gas exhaust chamber,
(To)...Gas inlet, (C)...Positioning protrusion,
(a)...Display means, kiln...pressurized air introduction hole, r2
I... Pressurized air means, (30)... Slide damper, (self)... Guide plate, 0... Covering plate, (b)
...Exhaust hole, 1...Rotating filter body, 10...
Filter element, (46)...Two-part partition plate, (46)...Display means. Figure 3F Figure 5Figure 1Figure 9Figure 8KirigikuFigure 10Figure 14 Figure 5Figure 13Figure 19Figure 22Figure 17Figure 30a

Claims (8)

[Claims] (1) A filter case (20) having a gas supply chamber (22) and a gas exhaust chamber (23) in the drying material storage body (1)
), and a rotary filter body (40) is provided in the filter case (20) in a detachable and rotatable manner, and gas is discharged from the gas exhaust chamber (23) by rotational displacement of the rotary filter body (40). A drying device characterized in that the flow direction of exhaust gas can be changed arbitrarily. (2) Gas supply chamber (22) of filter case (20)
The gas exhaust chamber (23) is in communication with the gas exhaust chamber (23), and a gas inlet (24) is provided on the side wall of the gas exhaust chamber (23), and a pair of gas inlet ports (24) are provided on the inner wall of the gas exhaust chamber (23) at approximately diametrical positions. The rotating filter body (40) has at least a filter element (41) stretched around the cylindrical outer periphery and an inner space of the filter element (41). and the filter element (
41) A two-part partition plate (42) with a ■-shaped cross section
and a gas exhaust chamber (23) of the filter case (20) protrudingly provided on the filter element (41) so as to substantially face the center portion (42a) of the two-part partition plate (42). It is equipped with a pair of seal plates (43), (43) positioned by a positioning protrusion (25), and the gas exhaust chamber (23) of the rotating filter body (40) can be covered with a filter lid (44). and the pair of seal plates (43), (43) are connected to the pair of positioning protrusions (25).
, (25), the dried material storage body (
1) The exhaust gas discharged from the rotary filter body (40
) to form a one-pass path (a) for discharging the material to the outside of the system via the filter element (41), and by further rotationally displacing the pair of seal plates (43), Exhaust gas discharged from the body (1) passes through the filter element (41) of the rotary filter body (40) without passing through the one-pass path (a).
) so as to form a circulation path (b) so as to return to the gas supply chamber (22) through the gas supply chamber (22).
Drying equipment as described in section. (3) The pair of seal plates (43), (43) are configured so that exhaust gas can pass through both the one-pass path (a) and the circulation path (b) by rotationally displacing them to arbitrary angular positions. A drying apparatus according to claim (2). (4) Filter case (20) and rotating filter body (
40) is provided with a display means (20) for displaying the rotation angle of the rotary filter body (40). The drying apparatus according to any one of claims (1) to (3). (5) A pressurized air introduction hole (27) is formed in the filter case (20) to prevent clogging of the filter element (41) of the rotating filter body.
) is provided with a pressurized air means (20).
The drying device according to any one of items 1) to (4). (6) The drying material storage body (1) has an air supply path (1a) that communicates with the gas supply chamber (22) of the filter case (20).
), (3a) and a large number of small holes (3b)... A material passageway (5) is formed between the inner cylinder (3) and a large number of small holes (4b). ..., and a heater (7) is suspended in the inner cylinder (3), while between the outer cylinder (4) and the outer case (8) Claim No. 2 is provided with exhaust passages (9) and (9a) communicating with the gas exhaust chamber (23) of the filter case (20).
The drying device according to any one of items 1) to (5). (7) Gas exhaust chamber (23) of filter case (20)
A slide damper (30) that can open and close the inlet (23a) of the gas exhaust chamber (23) is located near the inlet (23a) of the gas exhaust chamber (23).
A drying apparatus according to any one of claims (1) to (6), wherein the drying apparatus faces: (8) Above the tip (30b) of the slide damper (30) and the inlet (23a) of the gas exhaust chamber (23), both (3
0b) and (23a) is fixed, and this covering plate (32) has an inlet (23) of the gas exhaust chamber (23).
23. The drying device according to claim 7, further comprising an exhaust hole (34) that can be communicated with the drying device (23a).