JPH0445027Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a drying device for powder and granular materials such as synthetic resins, pharmaceuticals, and processed foods. The present invention relates to a drying apparatus that supplies drying gas to materials, etc., to dry the materials, etc., and to reduce the moisture content to a certain value or less.

[Conventional technology]

These powder and granule materials (hereinafter simply referred to as materials)
To prevent an increase in the moisture content of the material, material manufacturers either directly place it in a storage container such as a drum or once seal it in a plastic bag, etc., and then seal the opening of the storage container with a lid. There are, but
The user of the material in this storage container may not use all of the material at once, but may divide it into several uses.

In this case, in general, after opening the storage container such as a drum can, a lid is simply placed on the opening of the storage container, so the material inside the storage container absorbs moisture and has a lower moisture content than the original. The water content also becomes high.

For this reason, in the case of powder and granular materials such as pharmaceuticals and processed foods, not only do their physical properties change and quality deteriorate, but they also undergo chemical changes and decay, making them unusable. There was also a risk that the fluidity of the material would decrease, resulting in clogging or crosslinking of the material during post-processing steps in transport pipes and the like.

In addition, before using such materials, it is possible to transfer them to a separate dryer and dry them before use, but this requires the effort and effort of transferring the materials in the storage container to the dryer each time, and There were problems such as the need for unnecessary drying time until the moisture content was reached.

The above-mentioned problems can be largely solved by using the vertical cylindrical dryer disclosed in Japanese Utility Model Publication No. 52-20789.

The device disclosed in Japanese Utility Model Publication No. 52-20789 includes an outer cylinder that is fixed to a rotary table and rotated, and a lid that covers the upper opening of the outer cylinder. The exhaust inner cylinder, the bypass exhaust pipe, the hot air suction pipe, and the supply hopper connection pipe are connected, and a material storage chamber is formed between the exhaust inner cylinder and the outer cylinder, and the upper part of the material storage chamber is narrow. The lower part is an annular part, and the lower part is an enlarged annular part. Part of the hot air supplied from the hot air blowing pipe is brought into countercurrent contact with the material from the supply hopper in the narrow annular part, and the remaining hot air is brought into cocurrent contact with the material in the enlarged annular part. The dried material is allowed to fall naturally from the discharge section, and the exhaust gas is discharged from the exhaust inner pipe and the bypass exhaust pipe.

[The problem that the idea aims to solve]

However, in the above-mentioned Japanese Utility Model Publication No. 52-20789, (a) a narrow annular portion and an enlarged annular portion are formed via a small cylinder in the material storage chamber formed by the inner cylinder for exhaust and the outer cylinder. In addition to being troublesome, in order to effectively achieve uniform drying, it is necessary to rotate the outer cylinder via a drive device or a transmission mechanism, which not only complicates the structure but also increases the number of components.

(b) Also, since the dried material is discharged by natural fall from the discharge section, there is a risk that material in areas where hot air does not reach, such as near the discharge section, may not be sufficiently dried and may be discharged in a short-circuit manner. .

This invention attempts to solve all of the above problems with a simple structure without employing many components or complicated structures as in the conventional example.

[Means to solve the problem]

In order to solve the above-mentioned conventional problems, this invention provides a lid body that covers the opening of the storage container with a dry gas introduction pipe and a material transport nozzle that expose to the lower part of the storage container, and an exhaust pipe. In an apparatus for drying powder or granular materials, etc., in which the dried material is sucked and transported upward from the material inlet at the lower part of the material transport nozzle by the air force of a suction air source, the drying gas introduction pipe is installed at a suitable position on the lid body. The dry gas introduction inner pipe is vertically disposed below the insertion opening formed in the inner dry gas introduction pipe and has a gas outlet, and the dry gas introduction outer pipe is connected in communication with the upper part of the dry gas introduction inner pipe. A material transport nozzle is inserted into and taken out freely, the space formed by the outer circumferential wall of the material transport nozzle and the inner circumferential wall of the dry gas introduction inner pipe is used as a gas conduction path, and the material inlet of the material transport nozzle is connected to the dry gas introduction inner pipe. It is configured to face the inside of the gas outlet.

The material can be discharged from the material transport nozzle facing the lower part of the storage container by suction transporting the material from the material inlet of the material transport nozzle by driving a suction air source, or by supplying pressurized air to create a negative pressure. It is also possible to perform suction and pressure feeding. According to such a configuration, there is no need to open the lid and discharge the material in batches each time, and continuous transportation (discharge) can be performed automatically.

Further, the lid body can be attached to the opening of the storage container from the beginning, or can be attached by replacing the original canopy of the storage container. The latter removable structure is convenient because the used lid can be used for other storage containers one after another.

The inside of the storage container can be constructed to be hermetically sealed by the cover of the lid, and the inside of the storage container can be configured to have a higher pressure than the outside air through pressurized gas from the dry gas introduction pipe.

The inside of the bottom of the storage container can be sloped so that the material inlet of the material transport nozzle faces the bottom of the slope.

〔Example〕

An embodiment of this invention will be described below with reference to FIGS. 1 and 2.

Reference numeral 1 denotes a storage container such as a drum. Inside this storage container 1, a powder material M is stored in a sealed bag 4 such as vinyl, and the opening 2 of the storage container 1 is closed with a lid 5. It is sealed to prevent the moisture content of the powder material M from increasing. storage container 1
When using the present device, remove the canopy (not shown) that originally covered the opening 2, open the bag 4 made of vinyl, etc., and cover it with the lid 5. The upper edge 4a of the bag 4 is folded outward and downward from the opening upper edge 3 of the storage container 1 (see FIG. 1).

The lid body 5 has a size sufficient to cover the opening 2 of the storage container 1, and has an annular groove 6 formed at its outer peripheral end. By sandwiching and fitting the upper end of a bag 4 made of vinyl or the like between the lid 5 and the edge 3, the lid 5 is configured to removably seal the opening 2 of the storage container 1. In addition, when high-temperature gas is used as the drying gas, which will be described later, the lid 5 may have an open structure instead of being sealed as described above, or the original canopy of the storage container 1 may be replaced with the structure of the lid 5. You can also.

This lid body 5 has a dry gas introduction pipe 10 for introducing dry gas such as dry air into the lower part of the storage container 1.
, an exhaust pipe 20 for discharging exhaust gas from inside the storage container 1 to the outside of the system, and a material transport nozzle 30 that exposes to the lower part of the inside of the storage container 1.

That is, the dry gas introduction pipe 10 includes an inner dry gas introduction pipe 10b that is vertically disposed below the insertion port 8 formed in the center of the lid 5 and has a gas outlet 11, and an inner dry gas introduction pipe 10b that is connected to the upper part of the inner dry gas introduction pipe 10b. Insertion connection and lid body 5
The dry gas introduction outer tube 10a is fitted into the insertion hole 7 of the dry gas introduction tube 10a.

A material transport nozzle 30 is inserted into and out of the dry gas introduction inner pipe 10b, and a space formed by the outer peripheral wall of the material transport nozzle 30 and the inner peripheral wall of the dry gas introduction inner pipe 10b is defined as a gas conduction path S.

The material inlet 35 of the material transport nozzle 30 faces into the gas outlet 11 of the dry gas introduction inner pipe 10b.

A check valve 14 is attached to the inlet 12 side of the dry gas introduction outer tube 10a via an elbow pipe 13, etc., and a dry gas generating means such as dry air is installed at the proximal end of the inlet 12 (not shown). (heater or dehumidifier) and its ventilation means (motor and blower) are connected. Here, dehumidifying gas can also be used as the drying gas without heating.
Alternatively, heated hot air gas may be used, which is optional, but in the latter case, the opening 2 of the storage container 1 can be kept open by leaving the lid 5 in a non-sealed state.

Further, the portion of the dry gas introduction inner pipe 10b facing the storage container 1 can be made to be able to rise and fall freely, and a large number of diffuser holes can also be formed in the lower part of the dry gas introduction inner pipe 10b.

The insertion opening 8 for inserting the material transport nozzle 30 is formed so as to be able to communicate with a sleeve 31 protruding from the upper surface of the lid 5, and a packing 3 is provided on the inner periphery of the sleeve 31.
2 is fitted, and a male thread 33 is formed on the outer periphery.
A blind cap 34 is screwed onto this male thread 33 when the material transport nozzle 30 is not attached to prevent outside air from entering through the insertion port 8. The material transport nozzle 30 hangs down near the bottom of the storage container 1, has a material inlet 35 formed at its tip, and is connected to a suction air source (not shown) at its base end. The dried material is transported through the material outlet 36.

The exhaust pipe 20 is attached to another communication hole 7 of the lid body 5 at substantially the same location as the dry gas introduction outer pipe 10a. In this case, the intake port 21 of the exhaust pipe 20 has a minimum length so as not to come into contact with the material. An elbow pipe 23 and a check valve 24 are installed between the intake port 21 and the exhaust port 22.

The shapes and mounting positions of the dry gas introduction pipe 10, the exhaust pipe 20, and the material transport nozzle 30 can be changed as appropriate, and are not limited to those shown in the drawings.

The inside of the storage container 1 has a structure that is sealed by a lid 5, and the inside of the storage container 1 has a dry gas introduction pipe 10.
It is preferable to create a pressure higher than that of the outside air via a pressurized gas. This prevents humid air from entering the storage container 1.

Alternatively, the inside of the bottom of the storage container 1 may be sloped, and the material inlet 35 of the material transport nozzle 30 may be exposed to the bottom of this slope. This configuration has the advantage that the material at the bottom of the storage container 1 can be almost completely drained and no material remains.

8a and 8b shown in FIG. 2 are sampling ports formed in the lid 5, and when not in use, the sleeve 3
Although the blind caps 34a and 34b are screwed onto the portions 1a and 31b, it is also possible to perform sampling through the insertion port 8 without providing these sampling ports.

In this case, it is also possible to implement a configuration in which the upper end of the inner dry gas introduction tube 10b is extended above the lid 5, and the tip of the outer dry gas introduction tube 10a is connected to the extended portion.

In the embodiment described above, the dry gas introduction pipe 10 and the exhaust pipe 20 are directly connected to the lid 5, but they can also be connected indirectly through other piping.

[Effect of the embodiment]

An example of the operation of the above embodiment will be described below.

When using the granular material M filled in the storage container 1, first remove the canopy (not shown) of the main body of the storage container 1 from its opening 2, and then remove the lid 5 according to the present invention from the storage container 1. The opening 2 of the container 1 is covered.

The dry gas introduction pipe 10, exhaust pipe 20, and material transport nozzle 30 are attached to the lid 5 in advance, or these are attached after the lid 5 is covered as described above. The drying gas is introduced into the material inside the storage container 1 through the drying gas introducing inner pipe 10 from the inlet 12 of the drying gas introducing outer pipe 10a.
b. Drying gas is fed into the gas passage S for a required period of time, and when the material is dried to a desired drying value, the dried material is transported to the destination by the material transport nozzle 30. At this time, the material inlet 35 of the material transport nozzle 30 faces the gas outlet 11 of the dry gas introduction pipe 10, that is, the dry gas introduction inner pipe 10b, and the material near the material inlet 35 of the material transport nozzle 30 is exposed to the dry gas inlet. Since the drying gas from the gas outlet 11 of the pipe 10b is applied intensively, the materials are transported from the material transport nozzle 30 in the order they are dried.
On the other hand, the exhaust gas in the storage container 1 is exhausted from the exhaust pipe 20.

Finally, after taking out a predetermined amount of material from the material transport nozzle 30, the material transport nozzle 30 is
Remove it from the insertion hole 8 and cover with the blind cap 34.

If the moisture content becomes high before the material M is used up, the drying gas introduction operation described above is repeated.

[Effect of idea]

According to this invention, the lid that covers the opening of the storage container is provided with a dry gas introduction pipe and a material transport nozzle that extend to the lower part of the storage container, and an exhaust pipe.
In an apparatus for drying powdered or granular materials, etc., in which the dried material is sucked and transported upward from the material inlet at the bottom of the material transport nozzle by the air force of a suction air source, the drying gas introduction pipe is installed at a suitable position on the lid. The dry gas introduction inner pipe is vertically disposed below the insertion opening formed in the inner dry gas introduction pipe and has a gas outlet, and the dry gas introduction outer pipe is connected in communication with the upper part of the dry gas introduction inner pipe. A material transport nozzle is inserted into and taken out freely, the space formed by the outer circumferential wall of the material transport nozzle and the inner circumferential wall of the dry gas introduction inner pipe is used as a gas conduction path, and the material inlet of the material transport nozzle is connected to the dry gas introduction inner pipe. Since it is configured to face inside the gas outlet, it has the following effects.

Namely, (1) In the present invention, the drying gas is supplied from the top to the bottom of the gas passage formed by the inner and outer double pipes of the drying gas introduction inner pipe and the material transport nozzle. is suctioned and transported upward from the material inlet of the material transport nozzle by the suction air source, so that the drying gas flow direction and the material flow direction are completely dried in a countercurrent state, and
Although the drying distance is equal to the stroke length of the gas conduction path and the surface to be dried is wide, and the material to be dried is inside the material transport nozzle,
Since the drying gas is located in the gas passageway to which the drying gas is supplied, the structure is simpler and the drying efficiency is significantly improved compared to the conventional example.

(2) Moreover, as mentioned above, the material to be dried in the material transport nozzle located in the gas conduction path is dried by convection of the drying gas within the gas conduction path or by conduction to the material transport nozzle. Dry more efficiently.

(3) The present invention allows the material transport nozzle to be freely inserted into and taken out of the dry gas introduction inner pipe that is vertically installed below the insertion opening formed in the lid body, and the material transport nozzle faces into the gas outlet of the dry gas introduction inner pipe. Since the height of the material inlet of the nozzle can be adjusted arbitrarily, the drying gas from the outlet of the drying gas introduction pipe acts intensively on the material near the material inlet of the material transport nozzle, and the material is transported in the order of drying. It can be transported through a nozzle, and there is no risk that the material will be transported in a short circuit while being insufficiently dried. The material transport nozzle can also be protected with a dry gas introduction inner tube.

Furthermore, since the dry state can be maintained indefinitely by supplying drying gas at any time, the material will not absorb moisture and change its physical properties, and therefore will not deteriorate in quality or become unusable.
Furthermore, since it is possible to prevent a decrease in the fluidity of the material due to an increase in moisture content, it is possible to prevent clogging or crosslinking of the material during post-processing steps in transport pipes and the like.

[Brief explanation of the drawing]

The figure shows one embodiment of this invention. FIG. 1 is a longitudinal sectional view, and FIG. 2 is a plan view of FIG. 1. 1... Storage container, 2... Opening, 5... Lid, 1
0...Dry gas introduction pipe, 10a...Dry gas introduction outer pipe, 10b...Dry gas introduction inner pipe, 11...Gas outlet, 12...Inlet, 20...Exhaust pipe, 21...
...Intake port, 22...Exhaust port, 30...Material transport nozzle, 35...Material inlet.

Claims (1)

[Claims for Utility Model Registration] (1) A dry gas introduction pipe 10, a material transport nozzle 30, and an exhaust pipe 20, which are exposed to the lower part of the storage container 1, on the lid 5 that covers the opening 2 of the storage container 1. In an apparatus for drying powdered or granular materials, etc., the dried material is suctioned and transported upward from the material inlet 35 at the lower part of the material transport nozzle 30 by the air force of a suction air source. Reference numeral 10 designates an inner drying gas introduction pipe 10b which is vertically disposed below the insertion port 8 formed at a proper position of the lid body 5 and has a gas outlet 11, and a drying gas introduction outer pipe 10b which is connected in communication with the upper part of the inner drying gas introduction pipe 10b. A space is formed by the outer peripheral wall of the material transport nozzle 30 and the inner peripheral wall of the dry gas introducing inner pipe 10b. A drying device for powdered or granular materials, characterized in that the material transport nozzle 30 is configured so that the material inlet 35 faces the gas outlet 11 of the drying gas introduction inner pipe 10b. (2) The inside of the storage container 1 has a structure that is sealed by the cover of the lid body 5, and the inside of the storage container 1 is designed to have a higher pressure than the outside air through the pressurized gas from the dry gas introduction pipe 10. Scope of patent registration request No.
Drying equipment for powder and granular materials, etc. as described in (1). (3) The inside of the bottom of the storage container 1 is sloped, and the material inlet 35 of the material transport nozzle 30 is exposed to the bottom of this slope.
A drying device for powdered or granular materials, etc. as described in paragraph (1) or paragraph (2).