JPH0743068A - Method and apparatus for centrifugally drying - Google Patents

Abstract

PURPOSE:To largely shorten the drying time of liquid such as hydrocarbon, alcohol, etc., adhering to an object to be dried by a centrifugal force by rotating the object to be dried in an atmosphere of superdry air. CONSTITUTION:The apparatus for centrifugally drying comprises a sealed vessel 1, a holding rotor 7 disposed in the vessel 1 for rotatably holding an object W to be dried such as various component, etc., to which liquid such as water, hydrocarbon, alcohol, etc., adheres and an air exchanging mechanism 10 for exchanging the air in the vessel 1 with an atmosphere of superdry air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal drying method and apparatus used for drying precision machine parts to which cleaning solvents such as water, hydrocarbons and alcohol are attached.

[0002]

2. Description of the Related Art Drying of precision machine parts of this kind is an extremely important step particularly in precision cleaning by wet cleaning.

[0003] Conventionally, as this type of centrifugal drying device, there has been one that utilizes centrifugal force. In this device, parts to be dried are put in a basket and rotated, and the attached liquid is drained, and at the same time, the air produced by the rotation is used for drying.

There is also one in which hot air is added to this centrifugal drying to dry it simultaneously with the centrifugal drying.

[0005]

However, in the case of the above-mentioned conventional method, in the case of a liquid having a slow evaporation rate, it is not dried in a short time. For example, it is difficult to dry it within the takt time of the cleaning device. In the case of the method of using hot air together, the drying time can be shortened, but a large amount of power is required to create hot air, and especially in the case of flammable liquids, the gas concentration of flammable gas will explode. It has been pointed out that there is an inconvenience in that the amount must be suppressed below the lower limit, and that a large amount of heated air is required, and thus a further large electric power is required.

[0006]

The present invention is intended to solve these disadvantages, and the centrifugal drying method of the first invention has a liquid such as water, hydrocarbon or alcohol attached thereto. When drying an article to be dried such as various parts, the article to be dried is rotated in an atmosphere of ultra-dry air, and centrifugal force generated by the rotation and the ultra-dry air are used in combination for drying. Is.

At this time, the material to be dried can be dried by rotating in an atmosphere of heated ultra dry air.

The centrifugal drying apparatus of the second invention holds an airtight container and an object to be dried such as various parts to which liquids such as water, hydrocarbons and alcohol are attached, which are disposed in the airtight container. It is provided with a holding rotating body to be rotated and an air exchange mechanism for making the inside of the closed container an atmosphere of ultra-dry air.

At this time, the air exchange mechanism is provided with a supply unit for supplying ultra-dry air, a nozzle unit for blowing the ultra-dry air into the closed container, and a closed container for air containing the vaporized gas of the adhering liquid in the closed container. It can be composed of a discharge part for discharging to the outside, and the super dry air can be heated by a heating part.

[0010]

When the material to be dried is rotated in an atmosphere of ultra-dry air, the liquid such as hydrocarbon and alcohol is shaken off by the centrifugal force, and the attached liquid is evaporated in the atmosphere of ultra-dry air, and the drying is quick. It will be done in a short time.

The drying time can be further shortened by rotating the material to be dried in an atmosphere of heated ultra dry air.

Here, the ultra-dry air means, for example, one having a relative humidity of 0.01% RH or less, preferably 0.00
It means a material having a content of about 3% RH or less.

[0013]

1 to 7 show an embodiment of the apparatus of the present invention, FIGS. 1 to 6 show a first embodiment, and FIG. 7 shows a second embodiment.

In the first embodiment shown in FIGS. 1 to 6, reference numeral 1 is a closed container, in which case a lid body 3 having a square container shape and a lid 3 whose upper opening can be opened and closed is attached by a support shaft 4. , A cylinder mechanism 5 for opening and closing the lid 3 is provided,
A bottom wall 6 is formed in the middle of the container body 2.

Reference numeral 7 denotes a holding rotating body, which is formed in a cage shape by a net material or a perforated material in this case, a rotation motor 8 is arranged below the bottom wall 6 and is rotated by the rotation motor 8. A rotary shaft 9 is provided vertically on the bottom wall 6, a holding rotary body 7 is attached to the rotary shaft 9, and various components such as water, hydrocarbons, alcohol, and other liquids L adhered to the holding rotary body 7 are covered. It is configured so that the dried product W is charged.

Reference numeral 10 denotes an air exchange mechanism, in this case, a supply section 11 for supplying the super dry air S, a nozzle section 12 for blowing the super dry air S into the closed container 1, and the above-mentioned attached liquid in the closed container 1. And an exhaust portion 13 for exhausting the air containing the evaporated gas to the outside of the closed container 1.

In this case, the nozzle section 12 is arranged at the opposite corner of the container body 2, the supply section 11 is connected to the nozzle section 12 by the air supply pipe 14, and the super dry air S sent from the supply section 11 is supplied. While high-pressure jetting onto the material to be dried W, the dried air in the closed container 1 and the vaporized gas of the liquid L are discharged from the discharge part 13 to maintain the inside of the closed container 1 in an atmosphere of ultra-dry air. The liquid inside is drained from the drain pipe 15.

Further, in this case, the supply unit 11 is, as shown in FIG.
A refrigerating air dryer 16 is connected in the middle of an air supply pipe 14 connected to a compressed air generating source, and a container 17 containing zeolite or the like is connected to the rear passage thereof. After forming the dry air as described above, the super dry air S is formed through the zeolite, and the super dry air is supplied to the nozzle portion 12.

The volatilization rate was measured using the ultra-dry air S at room temperature thus obtained. That is, an isoparaffin hydrocarbon solvent as a solvent to be volatilized is put in the container 18, the container 18 is placed on the measuring device 19, super dry air S of the following conditions is discharged from the nozzle 20, and the inside of the container 17 is super dried. It was filled with air S and evaporated gas of the solvent, and the total weight was measured over time.

The super dry air S is under the conditions shown in FIG. 5, that is, the temperature is 26.7 ° C. and the humidity is 0.003% R.
H, nozzle blowing air pressure 4.5 kg / cm ² , blowing flow rate 30 liters / min, wind receiving area 113c of container 18
and m ^2, whereas for comparison with conventional drying air was measured same using conventional dry air through only refrigeration air dryer 16. This normal dry air has a temperature of 26.5 ° C., a humidity of 10% RH, and an air pressure of 4.5 kg / c.
m ² , flow rate 30 liter / min, wind receiving area 113 cm ²
I am trying.

As a result, as shown in FIG. 6, when the liquid L of the hydrocarbon is dried, when the super dry air S is blown, it is dried at a speed about twice as fast as the normal dry air.

Since the first embodiment has the above-described structure, for example, a dried object W such as a cleaned precision machine part is put into the holding rotating body 7, the closed container 1 is closed by the lid 3, When the sealed container 1 is made to have an atmosphere of super dry air S at room temperature by the exchange mechanism 10 and the holding motor 7 is rotated by driving the rotation motor 8 in this state, the centrifugal force is applied to the dried object W. Liquid L such as hydrocarbon and alcohol
A large amount of the liquid W is shaken off and removed, and the thin liquid L remains on the surface of the material to be dried W, and the rotation of the material to be dried W touches and cuts off the surrounding air. Since it is the air S, the thin liquid L that has received this wind dries rapidly.

Thus, for example, the cleaning solvent such as water, hydrocarbons, alcohol, etc. attached in the cleaning step can be dried in a short time within a time of the takt time of the cleaning machine without using a large amount of heat, and the liquid Most of L is removed using the principle of a centrifuge to make the liquid L thinly wet the surface of the material to be dried W, and in this state, it is dried almost completely by blowing air in a super dry state. Therefore, the drying time can be significantly shortened.

The second embodiment of FIG. 7 shows another example, and the same mode parts as those of the first embodiment will be designated by the same reference numerals. In this case, a heating section 21 for heating ultra-dry air is provided. It was done.

That is, in the first embodiment, the super dry air S at room temperature is used, but in this case, the super dry air S is heated by the heating unit 2.
It is configured to be heated by No. 1 and jet the high temperature super dry air S from the nozzle portion 12 at high speed.

In the second embodiment, however, the same operation and effect as those of the first embodiment can be obtained, and the inside of the closed container 1 is made into an atmosphere of high temperature ultra-dry air S by the heating section 21. The object W to be dried in the holding rotary body 7 is exposed to high temperature super dry air while rotating, and the vapor pressure of the super dry air S increases due to the high temperature, and the volatilization rate can be increased. Further, it is possible to perform drying at a relatively low temperature in a short time without raising the temperature of the drying atmosphere, and to shorten the drying time accordingly.

The present invention is not limited to the above-mentioned embodiment, but for example, the structure of the closed container 1, the holding rotating body 7, the structure of the rotating mechanism, etc. are designed by appropriately changing them according to the material to be dried. Is. Further, the material to be dried is not limited to the cleaning parts, and the type of liquid is not limited to the cleaning solvent.

[0028]

As described above, the centrifugal drying method and apparatus of the present invention rotate hydrocarbons adhering to the material to be dried by the centrifugal force by rotating the material to be dried in the atmosphere of ultra-dry air, Shaking off a considerable amount of liquid such as alcohol, a thin liquid remains on the surface of the material to be dried, and the surrounding air is touched and cut off by the rotation of the material to be dried. This surrounding air is super dry air. As a result, the thin liquid that has received this wind is rapidly evaporated and dried, and the drying time can be greatly shortened.

Further, by rotating the material to be dried in an atmosphere of heated ultra dry air, the drying time can be further shortened.

The above-mentioned intended purpose can be sufficiently achieved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an apparatus according to a first embodiment of the present invention.

FIG. 2 is a plan sectional view of the first embodiment of the present invention shown in FIG.

FIG. 3 is a partial cross-sectional view of the first embodiment of the present invention shown in FIG.

FIG. 4 is an explanatory diagram of a method for measuring a volatilization rate of ultra-dry air.

FIG. 5 is a comparison diagram of use conditions of ultra dry air and normal dry air.

FIG. 6 is a volatilization rate comparison diagram of ultra dry air and normal dry air.

FIG. 7 is a vertical sectional view of a device according to a second embodiment of the present invention.

[Explanation of symbols]

 S Ultra dry air W Dried material L Liquid 1 Closed container 7 Holding rotating body 10 Air exchange mechanism 11 Supply part 12 Nozzle part 13 Discharge part 21 Heating part

Claims (5)

[Claims] 1. When drying an article to be dried such as various parts to which a liquid such as water, hydrocarbon, alcohol, etc. is attached, the article to be dried is rotated in an atmosphere of ultra-dry air, and is generated by the rotation. A centrifugal drying method, characterized in that a centrifugal force and the ultra-dry air are used together for drying. 2. The article to be dried is rotated and dried in an atmosphere of heated ultra dry air.
Centrifugal drying method described. 3. An airtight container, and disposed in the airtight container,
A holding rotating body for holding and rotating an object to be dried such as various parts to which liquids such as water, hydrocarbons and alcohol adhere, and an air exchange mechanism for making the inside of the closed container an atmosphere of ultra-dry air. Centrifugal drying equipment. 4. The air exchange mechanism comprises a supply unit for supplying ultra-dry air, a nozzle unit for blowing the ultra-dry air into the closed container, and an air containing vaporized gas of the adhering liquid in the closed container. The centrifugal drying device according to claim 3, further comprising a discharging unit configured to discharge the water to the outside of the closed container. 5. The centrifugal drying device according to claim 3, further comprising a heating unit that heats the ultra-dry air.