JPS5918106B2 - Rotor bearing support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bearing support device for a rotor of a centrifugal separator that continuously injects samples and performs centrifugal separation.

A conventional bearing support device for a rotor of a centrifugal separator will be explained with reference to FIGS. 1 and 2.

Reference numeral 1 designates a rotor 5. The rotor 1 is rotatably driven by a drive shaft 10 attached below, and a core 2 is attached to the upper surface and fixed and sealed via a lid 3.

A plastic bearing 12 and a hollow guide 11 are fixed on the core 2 at the upper center of the rotor 1.
Reference numeral 5 denotes a bottom plate forming a part of the frame body. A support plate 6 is fixed to the bottom plate 5 through screws T, and a support plate 6 is attached to the outer peripheral portion of the rotor 1.
A pillar 8 is installed on the top.

The hollow guide 11 is supported at its outer periphery by a bearing support 14 through a ball bearing 13 so as to be freely movable in rotation. The other end of the arm 15 on the rotor center side is attached and supported via a fixing bolt 16. On the upper surface of the plastic bearing 12, a stator 19 made of a cemented carbide metal material ■0 and in sliding contact with the plastic bearing 12 is disposed within the hollow guide 11.
, the bearing support 1 covers the guide 11 and the bearing 13 from above.
The plastic 1 for bearing
It is being pushed to 2.

An injection port 20 is formed on the stator 19 at the center of the rotating shaft 10, the bearing plastic 12, and the core 2.
The portion communicates with the inside of the rotor 1 in the radial direction. Further, (1) An outlet 21 is provided at a position away from the center of the rotating shaft 10 so as to pass through the core 2, the bearing plastic 12, and the stator 19 from the side near the center of the rotor 1. An annular communication passage 28 is formed on the bearing plastic 125 at the joint surface between the stator 19 and the bearing plastic 12, and communicates with the outlet 21 of the stator 19. Incidentally, an inlet 20 and an outlet 21 are formed in the upper part of the stator 19 in a tubular shape, and this tubular part penetrates the cover 17 and projects to the outside. The sample flows through the injection port 20 as shown by the arrow, and the rotor 1 is driven to rotate at high speed.
During the passage through the rotor 1, particles in the sample settle and become precipitate 4, which is collected in the rotor 1.

Further, the supernatant passes through an outlet passage in the core 2 and is discharged from the outlet 21. Since the sliding surfaces of the stator 19 and the bearing plastic 12 are pressed together, the sample will not leak.
In addition, the guide 11, the core 2, and the bearing plastic 12
O-rings 29 are attached to and sealed between the two. Therefore, the supernatant etc. will not leak. Although the bearing support device of this centrifugal separation rotor is configured as described above, there are some things that affect the performance of the continuous rotor.
Bearing plastic 12 and stator 19 for rotational sealing
There is a contact surface with

As mentioned above, this contact part is made of plastic to provide sliding properties, and the mating surface is made of cemented carbide, so that sufficient sealing performance can be maintained even when the rotor 1 rotates at high speed. Both the stator 19 and the bearing support 14 are required to be held without vibration. However, in the conventional structure shown in FIGS. 1 and 2, the two holding arms 15 to which the bearing support 14 is fixed are attached to the rotor 1 as described above
It is inserted and fixed into a guide 9 attached to a support 8 provided at a position around the .

Therefore, in order to maintain performance, it is necessary that the center of the drive shaft 10 and rotor 1 be located on the line connecting the pillars 8 and guides 9 on both sides, and that the center of the rotor 1 be located between the two pillars 8. becomes. That is, if the center of the rotor 1 is not on the line of the struts 8, 8, the bearing support 14 will be subjected to an unbalanced force in the lateral force direction by the struts 8 and the guides 9. Further, when the presser arm 15 receives the rotational force of the rotor 1 as a rotational torque through the bearing 13, the holding arm 15 receives the rotational force with only one side supporting force, and similarly applies an unbalanced force to the bearing support 14. Therefore, there is a drawback that vibration occurs between the bearing support 14 and the rotor 1, which is an obstacle to increasing the speed of the rotor. SUMMARY OF THE INVENTION An object of the present invention is to provide a rotor bearing support device that eliminates the above-mentioned drawbacks, prevents vibration of the rotor, increases rotational stability, and enables higher speeds.

The present invention supports a bearing support body by at least three arms, elastically attaches a connecting portion between the arms and the bearing support body, and fixes the outer peripheral fixed side of the arm in a longitudinal direction of the arm. It is formed to be adjustable. An embodiment of the rotor bearing support device of the present invention will be described below.
Components that are the same as those in the prior art are designated by the same reference numerals, and the general structure is almost the same as that in the prior art, so explanations of the same parts will be omitted and will be explained with reference to FIGS. 3 and 4.

The outer periphery of the bearing support 14 is fixed to the rotor center side ends of three holding arms 15 at equal intervals with bolts 16 with elastic sleeves 23 interposed, and the outer periphery of the other end of the arms 15 is It is attached via a lock screw 25 to a piece 24 that is fixed to a support 8 disposed on the outer circumference of the rotor 1. Therefore, since the bearing support 14 is supported by the arm 15 at three equally spaced points, no unbalanced force is applied that would cause the bearing support 14 to tilt. Also,
When a bending force is applied between the core 2 and the bearing support 14, the elastic sleeve 23 deforms and relieves the bending force.
A long hole 26 for attaching a lock screw 25 is formed in the arm 15 in the same direction as the longitudinal direction of the arm, as shown in FIG. The distance between the elongated hole 26 and the hole for inserting the bolt opening 6 is formed to be somewhat longer than the distance between the mounting positions of the bolt 16 and the lock screw 25. Therefore, when the bearing support 14 is fixed by the arm 15, even if the centers of the three pillars 8 do not coincide with the center of the rotor 1,
That is, even if the position of the pillar 8 is slightly shifted,
It is possible to simply and easily fix the gears 1, 15 and the bearing support 14 by aligning them with the center of the rotor 1 as shown in FIG. 5 or by adjusting them in the direction of the elongated hole 26.

In this case, the arm 15 includes the bolt port 6 and the elastic sleeve 2.
It can be fixed in a rotatable position around 3, and the elongated hole 2
Since the arm 15 on the 6th side is formed to be somewhat longer, it can be rotated and the lock screw installation position can be adjusted and fixed in the longitudinal direction of the arm 15. Therefore, the bearing support can be fixed without applying an unbalanced force to the support column 8 and the piece 24. The rotor bearing support device of this embodiment is configured in this manner, and by changing the bearing support from the conventional two-point support to three-point support, unbalanced force can be minimized.

Since the elastic sleeve is interposed at the fixing bolt attachment portion between the bearing support and the arm, the elastic sleeve deforms in response to the bending force applied between the core and the bearing support, thereby alleviating the bending force. Therefore, a stable bearing support mechanism can be achieved, vibrations can be reduced, and the sliding surface between the stator and the bearing plastic can be sufficiently sealed against rotation, and,
The rotor can be rotated at higher speeds, reducing separation time and improving efficiency. Furthermore, by making the mounting hole on the outer circumferential side of the arm into an elongated hole, even if the center position of the support column deviates from the center of the rotor, it can be easily matched with the center position of the rotor, and the number of assembly steps can be reduced. In the above embodiment, the bearing support is supported at three points, but it may be supported at four or more points, and an elastic sleeve may be interposed at the connection between the arm and the bearing support. Although the explanation has been made regarding the case where the buffer is provided in the horizontal direction, the effect is the same even if an elastic material other than the elastic sleeve is used. As described above, the rotor bearing support device of the present invention has effects such as preventing rotor vibration, improving rotational stability, increasing speed, and improving separation efficiency.

[Brief explanation of the drawing]

Figure 1 is a partial plan view of a conventional rotor bearing support device;
2 is a longitudinal sectional view of the device shown in FIG. 1, FIG. 3 is a partial plan view of an embodiment of the rotor bearing support device of the present invention, and FIG. 4 is a view of the device shown in FIG. 5 is a plan view of the arm of the device shown in FIG. 3 with the bottom plate removed after adjusting the position; and FIG. 6 is a plan view of the arm of FIG. 3. 1... Rotor, 10... Drive shaft, 11
...Guide, 12...Bearing plastic, 14...Bearing support, 15...
Arm, 19... Stator, 20... Inlet, 21... Outlet.

Claims (1)

[Claims] 1. A rotor that is driven via a drive shaft attached below, whose upper end side is rotatably supported via a bearing support, and into which a sample is injected from above and centrifuged; The above-mentioned shaft support body is supported on the rotor center side of the other ends of the plurality of arms to which one end is attached, and pivotally supports the hollow guide on the upper end side of the rotor, and the bearing plastic and A stator installed in the guide with which the bearing plastic comes into sliding contact is provided with an inlet and an outlet for continuously injecting the sample into the rotor,
The bearing support body is supported by at least three arms, and the arms and the bearing support body are connected via an elastic body, and the fixed position of the outer peripheral fixed side of the arm can be adjusted in the longitudinal direction of the arm. A rotor bearing support device characterized in that it is formed as follows.