JP3767773B2 - centrifuge - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a centrifuge capable of preventing a rotor rotation stoppage failure caused by sludge and crystal deposits.
[0002]
[Prior art]
For example, in electrolytic machining such as an electrolytic deburring machine, a part of the work piece becomes hydroxide sludge and elutes into the electrolytic solution, so that the electrolytic efficiency is lowered or the electrolytic solution supply passage hole It is necessary to separate and remove the sludge, which is hydroxide from the electrolyte, as the sludge accumulates on the part and closes the hole. As a means for separating and removing this sludge, the electrolyte and sludge There is known a method using a centrifuge that separates by using the specific gravity difference.
[0003]
However, in conventional centrifuges, sludge suspended in the machine and the electrolyte in a mist state crystallize in the gap between the fixed part of the bearing case, which is the bearing part of the rotor, and the rotating part of the rotor. As a result, there was a phenomenon in which the accumulated material hindered the rotation of the rotor and increased the load. As a result, there is a problem that the electrical protection device for the motor driving the rotor detects the overload and stops the rotation of the rotor, thereby significantly reducing the operating rate of the centrifuge.
On the other hand, in order to prevent such a rotor rotation stoppage failure, compressed air or pressurized water is supplied to the gap between the bearing case fixed portion and the rotor rotating portion at a constant period, and the accumulated sludge and crystal are removed. There have been proposals to eliminate them, but there are problems in that sufficient effects cannot be obtained, and in some cases, the bearings are damaged and their life is shortened.
[0004]
[Problems to be solved by the invention]
The present invention solves the conventional problems as described above, and is a centrifuge for separating and removing sludge in a liquid to be treated, and sludge and crystal are separated from a fixed part of a bearing case during processing. The present invention has been completed for the purpose of providing a centrifuge capable of preventing the rotor from stopping and preventing the rotor from being accumulated in a gap with the rotating part of the rotor.
[0005]
[Means for Solving the Problems]
The centrifuge of the present invention, which has been made to solve the above-mentioned problems, has a supply pipe for the liquid to be treated placed inside an inverted saddle-shaped rotor that is rotatably suspended via a bearing case installed on the ceiling of the casing. However, in the centrifuge in which the sludge in the liquid to be treated is separated and removed by the rotor, a sludge accumulation preventing impeller that rotates together with the rotor is installed in a gap portion between the bearing case and the rotor. It is a feature.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
The drawing shows a case where a centrifuge is used to separate and remove sludge from the electrolytic solution generated by electrolytic processing using an electrolytic deburring machine.
In the figure, 1 is a casing of a centrifuge, 2 is a bearing case having a pair of upper and lower bearings 2a and 2a installed on the ceiling of the casing, 3 is a drive motor, 4 is supported by the bearings 2a and 2a, and a belt The rotating shaft 5 connected to the motor 3 via the reference numeral 5 is a reverse saddle-shaped rotor suspended from the tip of the rotating shaft 4, and 6 is a supply of the liquid to be processed facing the inside of the rotor 5 from below. This configuration is basically the same as that of a conventional centrifuge of this type.
In addition, 7 is an openable / closable lid for removing sludge formed at the center of the floor of the casing 1, 8 is a discharge port for discharging the treated electrolyte formed at the lower side of the side wall of the casing 1, 9 Is a discharge pipe, and 10 is an electrolyte bath.
[0007]
In the present invention, an impeller 11 is installed in a gap portion between the bearing case 2 and the rotor 5 to rotate together with the rotor 5 to discharge the airflow radially and prevent the accumulation of sludge and crystalline substances. The impeller 11 is attached to, for example, the rotating shaft 4 and is configured to rotate together with the rotor 5, and a radial airflow is generated by the rotation of the impeller 11, so that a gap portion between the bearing case 2 and the rotor 5 is generated. This prevents the air from staying, and prevents the sludge and crystal deposits from being accurately deposited on this portion.
[0008]
In addition, as shown in FIG. 2, one or a plurality of inflow holes 12 for taking in external air can be formed in the ceiling portion of the casing 1 located above the impeller 11. As the vehicle 11 rotates, external air is automatically sucked from the inflow hole 12 and discharged radially, so that a cleaner air current is generated. It is possible to prevent the phenomenon of crystal deposition.
[0009]
As shown in FIGS. 3 to 5, the impeller 11 includes four or eight blades or an arbitrary number of blades 11a arranged at equal intervals, and the shape of the blade 11a is as follows. In addition to a flat plate shape, a curved plate shape can also be used. Further, the blade 11a can be attached perpendicularly to the ceiling surface of the rotor 5, or can be attached with a slight angle (θ) so as to be slightly downward, as shown in FIG.
[0010]
In such a configuration, an electrolytic solution containing sludge generated by electrolytic processing is supplied into the rotor 5 through the supply pipe 6, and only the sludge S is moved toward the inner wall surface of the rotor due to the specific gravity difference by the rotation of the rotor 5. The electrolytic solution that has been separated / removed and the sludge S removed is stored in the electrolytic solution tank 10 through the discharge port 8 and used again, which is the same as the conventional centrifugal separator of this type. .
In the present invention, an impeller 11 that rotates together with the rotor 5 to discharge airflow radially and prevent sludge accumulation is installed in the gap between the bearing case 2 and the rotor 5. Since the suspended sludge and the electrolyte in the mist state are blown off by the air flow, the gap between the lower surface portion of the bearing case 2 that is the bearing portion of the rotor 5 and the upper surface portion of the rotor 5 as in the prior art. In addition, sludge and mist electrolytes that are crystallized into crystals are not deposited. As a result, the rotation stoppage failure of the rotor is eliminated, and stable and efficient operation can be maintained for a long time. 1 to 2, the thick arrow indicates the flow of electrolyte, the thin arrow indicates the flow of air flow, and the broken arrow indicates the flow of sludge / mist.
[0011]
【The invention's effect】
As is clear from the above description, the present invention is a centrifuge for separating and removing sludge in the liquid to be treated, and the sludge and crystals are rotated by the fixed portion of the bearing case and the rotor during the treatment. It is possible to prevent the rotor from stopping and preventing the rotor from being accumulated in the gap with the part.
Therefore, the present invention contributes greatly to industrial development as a centrifuge that eliminates the conventional problems.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing another embodiment.
FIG. 3 is a plan view showing an example of an impeller.
FIG. 4 is a plan view showing another example of an impeller.
FIG. 5 is a plan view showing another example of an impeller.
FIG. 6 is an explanatory view showing an example of an attachment state of the impeller.
[Explanation of symbols]
1 Casing 2 Bearing case 5 Rotor 6 Supply pipe
11 impeller
12 Inlet hole for external air intake

Claims (2)

The supply pipe (6) for the liquid to be treated is exposed inside the inverted saddle-shaped rotor (5) which is rotatably suspended via a bearing case (2) installed on the ceiling of the casing (1). ) In the centrifuge that separates and removes sludge in the liquid to be treated, and rotates with the rotor (5) in the gap between the bearing case (2) and the rotor (5) to discharge airflow radially. A centrifuge characterized by installing an impeller (11) for preventing accumulation of sludge. The centrifuge according to claim 1, wherein an inflow hole (12) for taking in external air is formed in a ceiling portion of the casing (1) located above the impeller (11).

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