JPS61197062A - Differential speed increasing gear of centrifugal separator - Google Patents

Abstract

PURPOSE:To obtain the titled differential speed increasing gear of a centrifugal separator which is compact and capable of increasing the speed without rotating the whole apparatus by interposing two epicyclic gear mechanisms between the shaft of a driving source and the shaft of a rotor, fixing the one mechanism and rotating the other mechanism. CONSTITUTION:A differential speed increasing gear 2 consists of a double row epicyclic gear mechanisms 18 and each epicyclic gear mechanism 18 and 18' consists of epicyclic gears 15 and 15', internal gears 16 and 16' and sun gears 17 and 17' in a differential speed increasing gear of a centrifugal separator for use in the solid-liq. separation of municipal sewage and industrial waste water. The epicyclic gears 15 and 15' in two rows are supported freely rotatively by the shaft 14a of a carrier 14 fixed to a driving shaft 1, the one of the two sun gears 17 and 17' is fixed to a concentric input shaft 7 of rotors 4 and 5 and the other 17' is fixed to an input shaft 6. Accordingly, only one internal gear is rotated at necessary low speed and the whole need not be rotated at high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a differential speed increasing device for a centrifuge.

[Prior art]

For example, a centrifuge is used as a device for separating a solid-liquid mixture such as municipal sewage or industrial wastewater into solid-liquid. Generally, this centrifugal separator supports two rotating bodies concentrically, and rotates them in the same direction with a slight difference in rotation.
The rotating body is configured to rotate at a high speed of 00 to 5000 r, p, +m, and a mixed liquid is supplied between the two rotating bodies.

However, in this type of conventional centrifugal separator, the entire differential speed increaser for rotating the two rotating bodies with a slight rotational difference is configured to rotate together with the two rotating bodies. Therefore, when balancing the differential speed increaser body to prevent vibration, it is extremely difficult to achieve perfect balance, and there are also problems in ensuring sufficient circulation of lubricating oil within the mechanism. Ta. Therefore, this is a major bottleneck in increasing the capacity and speed of centrifuges.

[Purpose of the invention]

The purpose of the present invention is to solve the above-mentioned conventional problems, to enable a structure in which the entire device does not need to rotate together with a rotating body, and thereby to provide a differential centrifuge separator that facilitates increasing capacity and speed. The object of the present invention is to provide a speed increasing device.

[Structure of the invention]

The present invention achieves the above object by providing a differential speed increaser connected to the input side of a centrifugal separator that drives two concentrically supported rotating bodies in the same direction with a slight rotation difference. , two double-row planetary gear mechanisms are interposed between the drive shaft connected to the drive source and the concentric input shafts of the two rotating bodies, and the two-row planetary gears of the planetary gear mechanism are supported. A carrier is connected to the drive shaft side, and the rotary shafts to which the two sun gears are respectively fixed are concentrically connected to the concentric input shafts of the two rotating bodies, and the two inner gears of the planetary gear mechanism are It is characterized in that one of the gears is fixed and the other is driven to rotate.

〔Example〕 Hereinafter, the present invention will be explained with reference to embodiments shown in the drawings.

In the figure, 1 is a drive shaft that receives power from a drive source (not shown), 2 is a differential speed increaser according to an embodiment of the present invention, and 3 is a centrifugal separator.

The centrifugal separator 3 has a cylindrical external rotary body 4 and an internal rotary body 5 each having a truncated cone shape at one end. It rotates at a high speed in the same direction at a slightly faster speed than 5. The internal rotating body 5 has a screw 5a fixed to its outer peripheral surface,
A mixed liquid supply pipe 8 is fixed to the shaft center, and this supply pipe 8 communicates with the outer circumferential surface via a passage 9. Further, the external rotating body 4 is provided with a separated solid discharge port 10 at the truncated conical end, and a separated liquid discharge port 11 at the cylindrical end.

In such centrifuges, urban sewage.

A mixed liquid S such as industrial wastewater is supplied from the supply pipe 8 as shown by the arrow, and is discharged from the passage 9 to the inner surface of the external rotating body 4 by centrifugal force. The discharged mixed liquid S is transformed into solid S by the differential rotation of both rotating bodies 4 and 5 in the same direction.
The solid S is separated into a liquid and a liquid, and the solid S is moved to the discharge port 10 by the screw 5a and discharged into the case 12,
Further, the liquid is discharged into the case 13 from the discharge port 11.

The differential speed increaser 2 includes a double-row planetary gear mechanism 18.18'
Each planetary gear mechanism 18.18' is composed of a planetary gear 15.15', an internal gear 16.16°, and a sun gear 17.17'. The two rows of planetary gears 15.15゛ are connected to a carrier 1 fixed to the drive shaft 1.
The two sun gears 17 and 17' are rotatably supported on the carrier shaft 14a of the rotor 4, and the two sun gears 17 and 17' are rotatably supported on the carrier shaft 14a of the rotor 4.
．． One of the five concentric input shafts 6, 7 is fixed to the manpower shaft 7, and the other one 17' is fixed to the other manpower shaft 6. Of course, this input shaft 6.7 is connected to the sun gear 17.17.
The rotary shaft may be separated into `` side and both rotary bodies 4 and 5 side, and these may be connected by a joint or the like.

The internal gear 16 of the double row planetary gear mechanism 18.18'.
16', one internal gear 16 is fixed to a base or the like and is in a stationary state, and the other internal gear 16' is rotatable. The rotatable internal gear 16゛ has gear 2 on the outer periphery.
4, and the gear 23 of the rotating shaft 22 is meshed with this gear 24. Since the rotary shaft 22 is driven from the drive shaft 1 via the sprockets 19, 20 and the chain 721, the internal gear 16' is rotationally driven by the drive shaft 1 at a constant reduction ratio.

The internal gear 16' may be driven by a motor separate from the drive shaft 1. In addition, two rotating bodies 4,
If it is desired to arbitrarily change the speed difference of 5 from time to time, it is preferable to drive the motor using a variable speed geared motor.

The differential speed increaser 2 configured as described above differentially speeds up the power of the drive shaft 1 into two powers, and transmits the power to the external rotary body 4 and the internal rotary body 5 of the centrifugal separator 3. That is, the power of the drive shaft 1 is increased in speed by one planetary gear mechanism 18 and transmitted to the internal rotating body 5, and is increased to a higher speed than the planetary gear mechanism 18 by the other planetary gear mechanism 18''. and is transmitted to the external rotating body 4.

More specifically, the number of rotations of the drive shaft 1 is N. ,
The rotational speed of the external rotary body 4 (sun gear 17) is NI, and the rotational speed of the internal rotary body 5 (sun gear 17) is N2. If the speed increasing ratio is i and the rotation speed of the internal gear 16 of the planetary gear mechanism 18 is N, then N z = i No −−−−−−−−−−−−−
−−−−−−−−−−−−−−−−−−−−−−−−(
'IN, = iN0+ (i-1)NX -・-・---
-----(2):, NX= (NI i No
) / (11) = (NI - Nz ) / (i -
1,) '-・-・=(3).

Therefore, if NI, Nz, and No are given, i and N that satisfy these can be determined. That is, the speed ratio of the sprockets 19 and 20 in the differential speed increaser 2 and the gear 23. [Speed ratio of 4 and rotational speed N of drive shaft 1. If the product obtained by multiplying by Nx is set as Nx, it is possible to perform rotational drive with differential speed increase at the above-mentioned rotational speeds NI and Nz.

The previously mentioned differential speed increaser 2 has the internal gear 16 of one planetary gear mechanism 18 fixed and stationary, and the internal gear 16 of the other planetary gear mechanism 18'' rotates at a reduced speed. Just do it. Therefore, even if the centrifugal separator 3 has a larger capacity or higher speed, it is easy to maintain a balance to prevent vibrations and to perform internal lubrication.
There are no problems like in conventional equipment where the entire unit rotates at high speed.

In the above embodiment, a centrifugal separator that centrifugally separates urban sewage or industrial wastewater was explained, but this centrifugal separator can also be used to rotate two rotating bodies with a slight speed difference. For example, other substances may be centrifuged.

〔Effect of the invention〕

As described above, the present invention provides a differential speed increaser connected to the input side of a centrifugal separator, in which two A double-row planetary gear mechanism is interposed, a carrier supporting two rows of planetary gears of this planetary gear mechanism is connected to the drive shaft side, and rotating shafts for fixing two sun gears are concentric. connected to the concentric input shafts of both rotating bodies;
Moreover, since one of the two internal gears of the planetary gear mechanism is fixed and the other is rotationally driven, it is only necessary to rotate one of the internal gears at the required low speed, and the entire system does not need to be rotated as in the conventional device. There is no need to rotate at high speed. therefore,
Even if the capacity and speed of a centrifugal separator is increased, it is easy to maintain balance to prevent vibrations and to perform internal lubrication.

[Brief explanation of drawings]

The figure is a longitudinal sectional view showing a centrifugal separator equipped with a differential speed increaser according to an embodiment of the present invention. 1--Drive shaft, 2--Differential speed increaser, 3-Centrifugal separator, 4-External rotating body, 5-Internal rotating body, 6.7--
-Human power axis, 14-carrier, 15°15"-・
-Planetary gear, 16,16°-・Internal gear, 17.17'
--One sun gear, 18.18".-Planetary gear mechanism.

Claims (1)

[Claims] In a differential speed increaser connected to the input side of a centrifugal separator that drives two concentrically supported rotating bodies in the same direction with a slight rotation difference, the drive shaft connected to the drive source and a concentric input shaft of both rotating bodies, two double-row planetary gear mechanisms are interposed, and a carrier supporting two rows of planetary gears of this planetary gear mechanism is connected to the drive shaft side. At the same time, the rotating shafts for fixing the two sun gears are concentric and connected to the concentric input shafts of the two rotating bodies, and one of the two internal gears of the planetary gear mechanism is fixed, A differential speed increasing device for a centrifugal separator, characterized in that the other side is rotationally driven.