JPH03217257A - Continuous centrifugal separator - Google Patents

Abstract

PURPOSE:To continuously separate the sample of mixed state of two liquids into heavy liquid and light liquid by deviding a separated liquid discharge part of rotor into a light liquid passage and a heavy liquid passage and providing two passages in the shaft connected with the rotor as well as in the mechanical seal provided on the end part of the shaft. CONSTITUTION:The cylindrical rotor 11 which is provided with annular part in the center part to separate the sample and a rotor lid part 23 having a sample passing-through hole 19 in the lower part is connected with the lower end of the shaft 7. Two sample passages 9, 10 are independently provided in the center hollow part of the shaft 7. The mechanical seal consisting of a revolving seal 13 and a fixed seal 14 is disposed to the free end side of the shaft 7 so as to communicate with the sample passages 9, 10 to recover the liquids. Two passages 9, 10 through which the heavy liquid and the light liquid separated from the sample are independently passed are provided in the side of the rotor 11 to which the shaft 7 is connected, and this passages are connected with the two passages of the shaft 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a continuous centrifuge that centrifuges a sample by continuously flowing it through the centrifugal separator.

[Background of the invention]

As a conventional continuous centrifuge using a cylindrical rotor, there is, for example, a continuous centrifuge using a rotor in which the sample and the outside air are not isolated, as shown in Japanese Patent Publication No. 44-19670. This type of centrifuge does not have a sealing mechanism such as a mechanical seal that isolates the sample passage from the outside air, so bacteria and dust floating in the outside air may get mixed into the sample, or components in the sample may be released into the air. spread may occur. Furthermore, if the sample is volatile, such as an organic medium, it may diffuse into the outside air during centrifugation, resulting in loss of components and contamination of the outside air.

[Purpose of the invention]

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to prevent the sample to be separated from being contaminated by outside air.
In addition, it is possible to prevent the sample from diffusing into the outside air, and
It is an object of the present invention to provide a continuous centrifuge capable of continuously separating heavy liquid and light liquid from a sample in a mixed liquid state.

[Summary of the invention]

The present invention uses a sealing mechanism to isolate the sample passage of a continuous centrifuge from outside air. The liquid to be separated discharge part of the cylindrical rotor is divided into two passages, a heavy liquid inlet and a light liquid inlet, and the shaft connected to the rotor and the mechanical seal at its end are also two passages. It was devised so that the liquid layers could be separated.

[Embodiments of the invention]

FIG. 1 shows an embodiment of the present invention, and is a front sectional view. This centrifuge mainly consists of a frame 1, a drive unit 5, and a rotor 11.
, and a lower bearing portion 31. The frame 1 includes an upper plate 2, a bottom plate 3, a protective cylinder 4 provided so as to cover the periphery of the rotor, and the like. The drive section 5 is fixed to the upper plate 2 with screws or the like, and is composed of a motor section 6, an upper fixed seal section support, and the like. The rotating shaft of the motor section 6 has a through hole, and the shaft 7 is fitted and fixed at the upper part. An assembly of a rotary seal holder 12 and an inner pipe 8 fixed thereto is inserted into the shaft 7 from above, and is fixed with an upper screw. With this configuration, a passage within the inner pipe, that is, a light liquid passage 10, and a passage between the inner pipe 8 and the shaft 7, that is, a heavy liquid passage 9 are formed. The rotary seal holder 12 has a rotary seal 1 on the upper part.
It is designed to store 3. The rotary seal 13 has its upper surface slidably in contact with the stationary seal 14, and the contact pressure is applied by a spring 15, and this contact pressure seals the light liquid and heavy liquid flowing through the sample passage. do.

The material of this mechanical seal part is a low-friction, highly heat-resistant material such as carbon-containing fluororesin or polyimide resin on one side, and a high-hardness material such as hard flow plating or cemented carbide on metal. Metal materials are suitable. The rotor 11 includes a rotor body 21, a rotary lid 23 fixed to the lower end with a screw, a liquid-tight O-ring 24,
and a core 22 provided within the rotor body 21. In the upper part of the rotor body 21, a heavy liquid passage 9 extending to the outer periphery of the annular cavity and a light liquid passage 10 extending from the outer diameter of the annular cavity 722 form passages toward the contact portion of the shaft 7, respectively. 722 is for introducing a sample into a high centrifugal force field, and is provided to improve separation performance. The rotary lid 23 has a shaft-like extension having a sample passage hole 19 at its lower part, and is tightly fitted to the lower ball bearing parts 27 and 28 of the lower bearing part 31, and has a structure in which the rotary seal 13b can be inserted into the lower end. It has become. These rotors 11 are connected and fixed to the shaft 7 by rotor fixing nuts 20 at their upper ends. Lower bearing part 31
is fixed to the bottom plate 3, and includes a lower ball bearing 28 into which an adapter 27 for supporting the lower part of the rotor is press-fitted, a thrust washer 29 for applying preload to the outer race of the lower ball bearing 28, a spring 30, etc. and constitute a bearing section. The lower part of the lower bearing part has a mechanical seal part similar to the upper mechanical seal part of the drive part 5.
The material is as described above.

In a continuous centrifuge with such a configuration, a sample is injected from the fixed seal 14b at the bottom, introduced into the rotor 11 via the rotating seal 13b, introduced into a high centrifugal force field by the coil 722 within the rotor, and moved upward. In between, heavy liquid and light liquid are separated, with heavy liquid passing through heavy liquid passage 9 and light liquid passing through light liquid passage 10.
The shafts 7, 8, upper mechanical seal parts 12, 13, 14.15, 16, 17, 18 respectively
After that, it is ejected from the aircraft.

〔Effect of the invention〕

According to the present invention, the lower sample injection part is equipped with a mechanical seal consisting of a fixed seal and a rotating seal, and the liquid to be separated discharge part in the upper part of the rotor is divided into a light liquid passage and a heavy liquid passage. A light liquid passage and a heavy liquid passage are provided in the center of the shaft connected to the rotor, and a mechanical seal is provided at the end of the shaft, allowing the sample to be discharged separately from the outside air. It can be continuously separated into liquid and heavy liquid.

[Brief explanation of drawings]

FIG. 1 is a front sectional view showing an embodiment of a continuous centrifugal separator according to the present invention. In the figure, 1 is the frame, 2 is the upper plate, and 3
is a bottom plate, 4 is a protective cylinder, 5 is a drive unit, 6 is a motor unit, 7 is a shaft, 8 is an inner pipe, 9 is a heavy liquid passage, 10 is a light liquid passage, 11 is a rotor, 12 is a rotary seal holder, 13 is a rotating seal, 14 is a fixed seal, 15
1 is a spring, 16 is a stopper, 17 is a fixed seal holder, 18 is a fixed seal part supporter, 19 is a sample passage hole, 2
0 is a rotor fixing nut, 21 is a rotor body, 22 is a core, 23 is a rotary lid, 24 is an O-ring, 25 is a lower bearing support, 26 is a stopper, 27 is an adapter, 28 is a lower ball bearing, 29 is a thrust washer, 30 is a spring, and 31 is a lower bearing portion.

Claims (1)

[Claims] A drive unit that drives a cylindrical rotor, a shaft that is fixed to the drive unit and has a sample passage at its axial center, and is connected to the lower end of the shaft and has an annular cavity in the center for separating the sample and a sample passage hole at the bottom. A continuous centrifuge comprising: a cylindrical rotor having a rotary lid portion having a rotary lid portion; a bearing body supporting a lower shaft-like extension of the rotary lid; , a mechanical seal consisting of a rotary seal and a fixed seal is provided on the free end side of the shaft to communicate with each of the two sample passages so that liquid can be collected; and the shaft of the cylindrical rotor is connected to the mechanical seal. The cylindrical rotor has two passages through which the heavy liquid and light liquid of the separated sample pass independently on the side to be subjected to the test, and the passages are connected to each of the two passages of the shaft. The lower shaft end is equipped with a mechanical seal consisting of a rotating seal and a fixed seal. A continuous centrifuge for separating immiscible liquids into heavy and light liquids.