JPH06273038A - Decompression drying method and device - Google Patents

Abstract

PURPOSE:To provide a decompression drying method and its device capable of equally heating the whole works in a vessel and shortening drying time of the whole works by allowing every laminated work in a vessel, such as a basket to face a heater so that radiation energy, such as far-infrared rays may reach. CONSTITUTION:A vessel 4, such as a free rotating work-housing basket is installed in a decompression drying device 1 provided with a radiation heater 3 where the vessel 4 is rotated at a low speed or intermittently so as to turn works in the vessel, thereby replacing works on the front layer with works positioned inside and irradiating radiation energy to the whose works and drying up the works.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reduced pressure drying method and apparatus for drying a large amount of works such as small machine parts by a reduced pressure drying apparatus.

[0002]

2. Description of the Related Art A conventional method for drying a large amount of work such as small machine parts by a vacuum dryer is to reduce the pressure inside a drying chamber by a vacuum device such as a vacuum pump, and to stack a large amount of materials stored in a container such as a net basket. The work was performed by radiant heating with a radiant heater. However, in this conventional method, the radiant energy effectively acts on the work located on the surface layer portion facing the heater and the work can be dried smoothly, but far-infrared rays, etc. can be applied to the work located inside. Since the radiant energy does not reach, even if the work on the surface layer is dried, the work located inside is not dried, which causes a problem that the drying time becomes long.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and the work positioned inside the container, such as a net basket, faces the heater so that far infrared rays and the like are not generated. The present invention has been made to provide a vacuum drying method and apparatus capable of allowing radiant energy to reach and uniformly heating a work in a container such as a net basket and shortening the entire drying time.

[0004]

In order to solve the above-mentioned problems, a reduced-pressure drying method of the present invention has a low-pressure or intermittent container such as a net basket for storing a work in a reduced-pressure drying chamber equipped with a radiant heater. It is characterized in that the work is turned upside down and the work is inverted and dried. Further, the reduced-pressure drying apparatus of the present invention made to solve the above-mentioned problems is characterized in that a container such as a rotatable net basket for storing works is provided in a reduced-pressure drying chamber equipped with a radiant heater. Is.

[0005]

According to the present invention, while a work stored in a container such as a net basket is radiantly heated by a radiant heater in a vacuum drying chamber, the container such as the net basket is rotated at low speed or intermittently in a depressurized state. The work stored in the container is inverted and dried. That is, the work located on the surface layer and the work located inside are stacked and stored in a container such as a net basket, and all the works face the heater evenly and radiate far infrared rays. It is possible to shorten the drying time by being irradiated with energy and receiving radiant heat and being quickly dried under reduced pressure.

[0006]

Next, the present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 shows a first embodiment of the apparatus of the present invention. Reference numeral 1 is a reduced pressure drying chamber, and 2 is a pressure reducing apparatus such as a vacuum pump or an ejector for reducing the pressure of the reduced pressure drying chamber 1. Three
Is a radiant heater such as a far-infrared heater arranged on the wall surface of the vacuum drying chamber 1 in an appropriate number. Reference numeral 4 denotes a container such as a net basket for accumulating a large number of works 5 such as small machine parts, and the container 4 such as the net basket has the tip ends of the shaft rods 6, 6 stretched at the center of both ends thereof. Side walls 1 of the vacuum drying chamber 1 facing each other
a is axially supported by shaft holes 8 provided in a and 1a, and a drive device 7 is provided on an extension shaft portion 6a of one shaft rod 6 located outside the reduced pressure drying chamber 1 so as to rotate at low speed or intermittently. It is supposed to be possible. Reference numerals 9 and 9 denote seal portions for sealing the gap between the shaft hole 8 and the shaft rod 6 to maintain the reduced pressure state in the reduced pressure drying chamber 1. The size of the mesh of the container 4 such as a basket is not particularly limited, but the maximum size in which the stored work does not fall off is preferable because the most radiant heat hits the work. Further, the container 4 for storing the work is not limited to a net basket, and a punching plate or an expanded metal may be used as long as the work is held and has an opening for efficiently radiating the radiant energy to the inside. The container used may be used.

FIG. 2 shows a second embodiment of the device according to the present invention. The difference from the first embodiment is that the drive unit 7 is used.
Is provided in the reduced pressure drying chamber 1, and the shaft holes 8 and the sealing portions 9 for sealing are not required, and the degree of sealing of the reduced pressure drying chamber 1 is enhanced. Therefore, the container 4 such as a net basket is provided. Bearings 10, 1 provided with the tip ends of shaft rods 6, 6 stretched in the center of both end portions of the
The driving device 7 which is pivotally supported on 0 and is provided on one of the bearings 10 is an air-operated motor which does not require cooling and can operate normally even in the decompression / drying chamber 1. Other points are the same as those of the first embodiment. It is the same.

[0008] With the above-mentioned structure, since the decompression state is maintained by the decompression device 2 as well as the radiant heating by the radiant heater in the decompression drying chamber 1, the decompression state is laminated in the container 4 such as a net basket. The work 5 such as a large number of small machine parts that are stored in the same manner is dried in the same manner as the conventional reduced-pressure drying. Since the container 4 such as a net basket rotates at low speed or intermittently according to the present invention, a large number of small machine parts stored in the container 4 such as a net basket by this rotation. The work 5 and the like are repeatedly inverted so that the surface layer portion and the inside of the stacked work are exchanged,
All the workpieces are evenly exposed to the heater by far-infrared rays, and are radiant heat to be rapidly dried.

That is, when a large number of workpieces 5 such as small machine parts that are stacked and housed in a container 4 such as a net basket by revolving at a low speed are reversed, the drying speed is as shown in FIG. When the work 5 such as a large number of small machine parts that are stacked and stored in the container 4 such as a net basket is inverted by intermittent rotation, the drying speed is as shown in FIG. 4, and the work shown in FIG. This makes it possible to dry more quickly than the conventional drying method that does not invert. The rotation speed is usually 0, 1 to 10 r
It is in the range of pm and the cycle of intermittent operation is usually 10 seconds to
Although it is within a range of 5 minutes, it is possible to set a drive pattern that does not cause scratches during drying depending on the work.

[0010]

As is apparent from the above description, a container such as a net basket is rotated at low speed or intermittently to reverse a large number of small machine parts and the like stored in a container such as a net basket. By doing so, the surface layer portion and the inside of the laminated work are exchanged with each other, so that the whole work is uniformly irradiated with radiant energy such as far-infrared rays in a depressurized state, and the drying is performed quickly. Therefore, the present invention, which solves the problems of the conventional vacuum drying method, has a great contribution to the industrial development.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a first embodiment of the present invention.

FIG. 2 is a partially cutaway front view showing a second embodiment of the present invention.

FIG. 3 is a graph showing a drying rate when a container such as a net basket is rotated at a low speed.

FIG. 4 is a graph showing a drying rate when a container such as a net basket is intermittently rotated.

FIG. 5 is a graph showing a drying rate according to a conventional vacuum drying method.

[Explanation of symbols]

 1 Decompression drying room 2 Decompression device 3 Radiant heater 4 Container

Claims (2)

[Claims] 1. A reduced pressure drying method, characterized in that a container for storing a work is rotated at a low speed or intermittently in a vacuum drying chamber equipped with a radiant heater to invert and dry the work. 2. A reduced pressure drying apparatus, wherein a rotatable container for storing a work is provided in a reduced pressure drying chamber equipped with a radiant heater.