JP3423461B2 - Vacuum degreasing cleaning method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum degreasing and washing method for washing off oils and fats attached to industrial products.

[0002]

2. Description of the Related Art An apparatus used in a conventional vacuum degreasing and cleaning method is shown in FIG. 2, in which a vacuum heating chamber 2 is connected to an upper part of a cleaning chamber 1 and is connected to the cleaning chamber 1. An opening 3 communicating with the vacuum heating chamber 2 is closed by a sluice valve 4. A rack 7 for suspending an object to be cleaned 6 connected to a cylinder rod (not shown) of the first drive cylinder 5 is suspended above the opening 3 in the vacuum heating chamber 2, and the gate valve 4 is opened. Then, when the first drive cylinder 5 is operated to lower the cylinder rod, the rack 7 passes through the opening 3 and is lowered into the cleaning chamber 1.

In the figure, 8 is a vacuum pump connected to the vacuum heating chamber 2 via an oil trap 9, 10 is a first inert gas source for introducing an inert gas into the vacuum heating chamber 2, 1
Reference numeral 1 is a door for loading and unloading the object to be cleaned 5, 12 is a second drive cylinder for opening and closing the door 11, and 13 is a hydrocarbon-based cleaning liquid such as third petroleum stored in the cleaning chamber 1.

When performing the vacuum degreasing cleaning method using such an apparatus, the following procedure is performed. First, the cleaning object 6 carried into the vacuum heating chamber 2 is loaded with the rack 7
Then, the inside of the vacuum heating chamber 2 is evacuated by the vacuum pump 8. Next, an inert gas is introduced into the vacuum heating chamber 2 from the first inert gas source 10 up to the atmospheric pressure, and the inside of the vacuum heating chamber 2 is replaced with the inert gas. Next, after opening the sluice valve 4, the first drive cylinder 5 is operated to lower the rack 7 from the vacuum heating chamber 2 to the cleaning chamber 1, and the cleaning target 6 conveyed to the cleaning chamber 1 is cleaned. It is immersed in the cleaning liquid 13 inside and cleaned. Finally, the first drive cylinder 5 is operated to raise the rack 7 from the cleaning chamber 1 to the vacuum heating chamber 2, then the sluice valve 4 is closed, and the object 6 to be cleaned is vacuum dried in the vacuum heating chamber 2.

[0005]

In the conventional vacuum degreasing cleaning method, since the cleaning liquid 13 is a hydrocarbon type such as a third petroleum, the cleaning liquid 13 is prevented from coming into contact with the atmosphere. After the inside of the vacuum heating chamber 2 is evacuated, an inert gas is introduced to the atmospheric pressure to replace the inside of the vacuum heating chamber 2 with the inert gas, and then the sluice valve 4 is opened to remove the inert gas of the atmospheric pressure. Under the atmosphere, the article to be cleaned 6 was immersed in the cleaning liquid 13 in the cleaning chamber 1 for cleaning.

Therefore, when the object to be cleaned 6 is porous or has blind holes, even if the object to be cleaned 6 is immersed in the cleaning liquid 13, the inside of the holes and the blind holes are filled with an inert gas. Therefore, the cleaning liquid 13 does not flow into the inside of these, and there is a problem that the oil and fat adhering to the inside of the hole and the inside of the blind hole cannot be washed off.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a vacuum degreasing cleaning method capable of washing off oils and fats and the like adhering to the inside of the hole of the object to be cleaned and the inside of the blind hole. is there.

[0008]

In order to achieve the above object, the present invention introduces an object to be cleaned into a vacuum heating chamber which is connected to a cleaning chamber through a gate valve and keeps the inside of the vacuum heating chamber uninhibited. In the vacuum degreasing cleaning method in which the cleaning valve conveyed from the vacuum heating chamber to the cleaning chamber is immersed in the cleaning liquid after cleaning by opening the sluice valve after substituting with the active gas, the cleaning liquid is immersed in the cleaning liquid. During the cleaning, the pressure inside the vacuum heating chamber and the cleaning chamber is reduced.

Further, according to the present invention, the object to be cleaned is sprayed with an inert gas into the cleaning liquid while the object to be cleaned is immersed in the cleaning liquid and is being cleaned, and the cleaning liquid is stirred by the jetted inert gas. Is to be washed.

[0010]

In the present invention, when the object to be cleaned is dipped in the cleaning liquid to be cleaned, the insides of the vacuum heating chamber and the cleaning chamber are decompressed. Since there is no residual inert gas, the cleaning liquid flows into these parts, and it is possible to wash off the oil and fat and the like adhering to the inside of the holes and the inside of the blind holes.

Further, according to the present invention, an object to be cleaned is sprayed with an inert gas while the object to be cleaned is immersed in the cleaning solution and the cleaning solution is agitated with the sprayed inert gas. Since the object is washed, the washing efficiency is further improved.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. The apparatus used in the method of an embodiment of the present invention is an improvement over the conventional apparatus and is shown in FIG. In the figure, a gas nozzle 14 is arranged in the lower part of the cleaning chamber 1, and this gas nozzle 14 is connected to a second inert gas source 15.

In the figure, the same reference numerals as those in FIG. 2 showing the conventional device are the same and their explanations are omitted.

When carrying out the method of the embodiment of the present invention using such an apparatus, first, as in the conventional case, the article 6 to be cleaned carried into the vacuum heating chamber 2 is placed on the rack 7 and vacuum heated. The inside of the chamber 2 is evacuated by the vacuum pump 8. Next, an inert gas is introduced into the vacuum heating chamber 2 from the first inert gas source 10 up to the atmospheric pressure, and the inside of the vacuum heating chamber 2 is replaced with the inert gas.

However, next, after opening the sluice valve 4, the insides of the vacuum heating chamber 2 and the cleaning chamber are vacuum pumps 8.
Evacuate with. Then, the first driving cylinder 7 is operated to lower the rack 7 from the vacuum heating chamber 2 to the cleaning chamber 1,
The cleaning liquid 1 in the cleaning chamber 1 is the object 6 to be cleaned transferred to the cleaning chamber 1.
Immerse in 3 and wash. Then, after cleaning, the inert gas is introduced from the first inert gas source 10 into the vacuum heating chamber 2 and the cleaning chamber up to the atmospheric pressure.

Finally, as in the conventional case, the first drive cylinder 7 is operated to raise the rack 7 from the cleaning chamber 1 to the vacuum heating chamber 2, then the sluice valve 4 is closed and the vacuum heating chamber 2 is closed. The washed product 6 is vacuum dried.

In such an embodiment, the cleaning liquid 13
Since the insides of the vacuum heating chamber 2 and the cleaning chamber 1 are depressurized when the object to be cleaned 6 is immersed in the cleaning, the inert gas filling the inside of the hole of the object to be cleaned 6 and the inside of the blind hole is filled. As a result, the cleaning liquid flows into these parts, and it is possible to wash off the oil and fat and the like adhering to the insides of the holes and the blind holes.

After further cleaning, the first inert gas source 10
Instead of introducing an inert gas to the inside of the vacuum heating chamber 2 and the cleaning chamber 1 up to the atmospheric pressure, the object 6 to be cleaned is immersed in the cleaning liquid 13 to clean the cleaning liquid 13 from the middle of the cleaning process. When the inert gas is ejected and the cleaning object 13 is cleaned while stirring the cleaning liquid 13 with the ejected inert gas, the cleaning efficiency is further improved.

By the way, in the above-mentioned embodiment, after opening the sluice valve 4, the inside of the vacuum heating chamber 2 and the cleaning chamber 1 is evacuated by the vacuum pump 8, and then the first drive cylinder 5 is operated to evacuate. Although the rack 7 is lowered from the heating chamber 2 to the cleaning chamber 1, the insides of the vacuum heating chamber 2 and the cleaning chamber 1 are vacuumed while the rack 7 is lowered from the vacuum heating chamber 2 to the cleaning chamber 1. The pump 8 may be evacuated.

[0020]

As described above, according to the present invention, when the object to be cleaned is immersed in the cleaning liquid for cleaning, the inside of the vacuum heating chamber and the cleaning chamber is depressurized. Since the inert gas remaining inside the blind holes disappears, the cleaning liquid flows into these holes, and it is possible to wash off the oil and fat adhering to the inside of the holes and the blind holes.

Further, since the inert gas is jetted into the cleaning liquid while the cleaning liquid is being immersed in the cleaning liquid and the cleaning liquid is stirred by the jetted inert gas, the cleaning liquid is washed. The cleaning efficiency is further improved.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an apparatus used in a method of an embodiment of the present invention.

FIG. 2 is an explanatory view showing an apparatus used in a conventional vacuum degreasing cleaning method.

[Explanation of symbols]

1 ・ ・ ・ ・ ・ ・ Washing room 2 ... Vacuum heating chamber 3 ... Opening 4 ... Gate valve 6 ・ ・ ・ ・ ・ ・ Cleaning object 7 ... Rack 5 ... First drive cylinder 8 ... Vacuum pump 9: Oil trap 10 --- First inert gas source 11 ... Door 12 --- Second drive cylinder 13 ...- Cleaning liquid 14 ... Gas nozzle 15 --- Second inert gas source

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Minor Oda Minoru Oda 2500 Hagizono, Chigasaki City, Kanagawa Japan Vacuum Technology Co., Ltd. (58) Fields investigated (Int.Cl. ⁷ , DB name) B08B 3/08 C23G 5 / 02 F28G 9/00

Claims (2)

(57) [Claims] 1. A vacuum heating chamber, which is connected to a cleaning chamber via a sluice valve, carries an object to be cleaned, replaces the inside of the vaccum heating chamber with an inert gas, and then opens the sluice valve to open the vacuum heating chamber. In the vacuum degreasing cleaning method, in which the object to be cleaned conveyed from the cleaning chamber to the cleaning chamber is immersed in the cleaning liquid in the cleaning chamber for cleaning, when the object to be cleaned is immersed in the cleaning liquid and cleaned, the insides of the vacuum heating chamber and the cleaning chamber are A vacuum degreasing cleaning method characterized in that the pressure is reduced. 2. The vacuum degreasing cleaning method according to claim 1, wherein an inert gas is jetted into the cleaning liquid while the cleaning target is being immersed in the cleaning liquid and is being washed. A vacuum degreasing cleaning method, which comprises cleaning an object to be cleaned while stirring the cleaning liquid.