JP3189066B2 - Container rotating body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container-shaped rotating body using carbon fiber reinforced plastic which can be used for a rotating part of a centrifuge.

[0002]

2. Description of the Related Art A centrifugal separator using a carbon fiber reinforced plastic using high-strength and high-rigidity carbon fibers for a rotating part is used for separating a mixture composed of substances having different densities by centrifugal force. I have. For example, uranium enrichment processes related to nuclear power, marine fuel cleaning processes, and separation processes in the biotechnology field are typical examples of use. The centrifugal separator used for the separation of uranium gas related to nuclear power is disclosed in
No. 0-136378, a tape of metal foil is wrapped around the inner surface of a carbon fiber reinforced plastic cylinder, or as disclosed in JP-A-50-56331. In many cases, a corrosion-resistant coating layer is provided to protect the fiber-reinforced plastic portion. On the other hand, in a centrifugal separator used in a marine fuel cleaning process, a metal material that is hardly susceptible to corrosion such as stainless steel and has high physical wear resistance has been used. In the field of biotechnology, for example, as disclosed in Japanese Patent Application Laid-Open No. Sho 63-305952, carbon fiber reinforced plastic is used for a solid type rotary rotor into which a plurality of test tube-shaped containers can be inserted.

Although these inventions are applied to a centrifugal separator having a high centrifugal force while protecting the carbon fiber reinforced plastic portion, they are mainly used for uranium gas separation in the field of nuclear power. Not something. Also in the biotechnology field, solid type carbon fiber reinforced plastic is used as a fixing jig for small containers of test tube size, and is used to separate impurities from a large amount of liquid such as fuel oil. is not. In addition, every time the separated impurities are taken out of the centrifuge without the discharge mechanism, the operation of the centrifuge is stopped and manual work is required, and the operation rate is inevitably reduced.

Further, in the prior art, even if the centrifugal separator is operated at a high rotational speed in order to improve the performance of separating impurities from a large amount of liquid such as fuel oil, stainless steel having low specific rigidity and specific strength is required. In the case of a rotating body made of a material such as steel, the obtained centrifugal force is limited. For example, for centrifuges mounted on ships, high centrifugal force and high operating rate centrifuges that reduce engine maintenance frequency by removing minute impurities of about 1 μm contained in fuel oil are known. is needed. To obtain a high centrifugal force, generally,
A material having high specific strength and specific rigidity must be used for the material of the rotating part. For example, a metal such as stainless steel cannot sufficiently satisfy the above-mentioned demand. Therefore, it is necessary to use a material having high specific strength and specific rigidity such as carbon fiber reinforced plastic. In addition, in order to improve the operation rate, a centrifuge having a mechanism for appropriately discharging separated impurities without manually disassembling the centrifuge (hereinafter, referred to as an automatic discharge centrifuge) is essential. is there.

There are various methods for discharging internal impurities by an automatic discharge centrifuge, and the method relating to the present technology will be described below. The rotating body of the automatic discharge centrifugal separator has a valve cylinder movable up and down from the inside, a rotating body lid that fits with the valve of the valve cylinder directly above the rotating body, and a rotating body having a discharge hole on the outside thereof. , And the rotating body and the rotating body lid are fixed. The hydraulic circuit includes a first circuit for moving the valve cylinder upward and a second circuit for moving the valve cylinder downward.
Has lineage. During the centrifugal separation of the impurities, the pump of the second circuit is stopped, the valve cylinder is moved upward by the pump of the first circuit and fitted with the rotating body lid, thereby closing the discharge hole of the rotating body. deep. In order to discharge impurities,
After stopping the pump of the first circuit, the valve cylinder is moved downward by the water pressure of the pump of the second circuit, the discharge hole of the rotating body appears on the impurity side, and the impurity is rotated from the discharge hole by centrifugal force. Disperse outside the body. In the above-described method of discharging impurities, it is essential to provide a hole in the rotating body.
In the following description, a rotating body portion having a discharge hole is simply referred to as a rotating body.

[0006] However, carbon fiber reinforced plastic is a material much more brittle than metals such as steel,
Providing the vent holes directly in the carbon fiber reinforced plastic part promotes stress concentration in that part when centrifugal force is applied. As a result, it is highly likely that the rotating body is destroyed even at a low centrifugal force, and it is easily presumed that it is difficult to use the rotor under a high centrifugal force.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a composite container-like rotating body made of carbon fiber reinforced plastic and metal which can be used for an automatic discharge centrifuge capable of treating a large amount of liquid with a high centrifugal force. It is.

[0008]

According to the present invention, a carbon fiber reinforced plastic cylinder is vertically opposed to an outer periphery of a bottomed metal cylinder with a protrusion provided near the center in the height direction of the outer periphery. A cylindrical double structure in which the surface of the protruding portion of the metal cylinder is exposed so that the mating surface between each opposing end face of the carbon fiber reinforced plastic cylinder and the metal cylinder protrusion is provided inside the cylinder. A container-shaped rotating body characterized in that the tapered surface is formed so as to expand toward the outside, and a taper angle θ formed between the cylindrical axis direction and the tapered surface is 15 to 80 °.

According to the present invention, there is provided a double structure of a carbon fiber reinforced plastic cylinder and a bottomed metal cylinder which can be used for an automatic discharge centrifuge having a discharge hole in a rotating part.
In the following description with reference to the drawings, a discharge hole is not particularly shown.

FIG. 1 shows a half-cut configuration of the container-like rotating body 8 of the present invention. In the figure, 1 is a carbon fiber reinforced plastic cylinder, and 2 is a metal cylinder. The metal cylinder 2 has a protruding portion 3 having a trapezoidal cross section at the center part of the outer periphery, and the carbon fiber reinforced plastics 1 and 1 are vertically arranged so as to sandwich the protruding portion 3 so that the surface of the protruding portion 3 is exposed. Then, it is closely fixed to the surface of the cylinder 2. On the opposite end faces of the carbon fiber reinforced plastic cylinder 1, an inclined (tapered) surface e that opens toward the center is formed, and an inclined angle formed between an imaginary line y parallel to the axial direction of the cylinder 1 and the tapered surface e. (Hereinafter referred to as a taper angle) θ is set to 15 to 80 °. On the other hand, an abdominal portion of the protrusion 3 joined to the end face of the carbon fiber reinforced plastic has a similar tapered surface e ', and both tapered surfaces e, e' are joined by a fitting surface 4. In the drawing, reference numeral 9 denotes a bottom plate.

In the present invention, the upper and lower fitting surfaces 4, 4 of the end face e of the carbon fiber reinforced plastic 1 and the protruding portion 3 of the metal cylinder 2 form a tapered surface which opens toward the center of the structure,
The reason for limiting the taper angle θ to 15 to 80 ° is as follows. That is, a discharge hole (not shown) for the separated material is provided in the metal cylindrical protrusion 3 exposed on the outer periphery of the rotating body to avoid installation in the carbon fiber reinforced plastic cylindrical part. Allowable taper angle θ to attach segregate discharge holes
Is determined as follows. First, the thickness of each of the carbon fiber reinforced plastic cylinder and the metal cylinder in the case where there is no discharge hole is determined so that deformation and stress / strain due to centrifugal force of the rotating body do not lead to breakage of the material. From the viewpoint of machining accuracy, the thickness of each of the carbon fiber reinforced plastic cylinder and the metal cylinder is desirably 2 mm or more. Opening the upper and lower mating surfaces 4 and 4 of the carbon fiber reinforced plastic and the metal cylinder toward the center of the structure is the opposite, in which case the deformation of the cylindrical portion exposed on the surface due to centrifugal force is prevented. This is because it is difficult to suppress the carbon fiber reinforced plastic portion.

FIG. 2 is an enlarged view of a portion where a discharge hole is provided. As shown in FIG.
When the taper angle θ is large, the degree of concentration of stress at points A and B is high, and the shearing force generated between A and B exceeds the strength of the adhesive, so that the carbon fiber reinforced plastic cylinder and The possibility of separation from the metal cylindrical container increases. On the other hand, as the taper angle θ is smaller, the portion where the thickness of the carbon fiber reinforced plastic is smaller than the thickness of the metal cylinder increases, and the carbon fiber reinforced plastic having high specific rigidity cannot suppress the deformation of the metal cylinder. From the above results, it is necessary to determine an appropriate taper angle. Strictly speaking, the appropriate taper angle is determined by the number of rotations, the size of the rotating body, and the density, thickness, rigidity, strength, etc. of each of the metal cylindrical part and the carbon fiber reinforced plastic part. In consideration of the machining accuracy of the plastic cylinder and the metal cylinder, the range is preferably 15 to 80 °. At this time, a high processing accuracy and a bonding technique are required, but the curve between A and B may be configured with a smooth curve having a tangent inclination in a range of 15 to 80 °. The length of the exposed cylindrical portion of the projection 3 is preferably as short as possible in order for the carbon fiber reinforced plastic portion to suppress the deformation of the metal cylindrical projection, but it is preferably 5 mm or more and 40 mm or less in practical use.

The container-shaped rotating body of the present invention can be manufactured by the following method. First, after determining the thickness of the carbon fiber reinforced plastic cylinder and the metal cylinder in the case where there is no discharge hole by the above method, the carbon fiber reinforced plastic cylinder obtained by impregnating and curing the resin in the carbon fiber is machined. A carbon fiber reinforced plastic cylinder 1 having a tapered portion on its inner surface such that an angle (taper angle) θ formed with an imaginary line 4 parallel to the center line of the cylinder is 15 to 80 °.
Get. The carbon fiber has a tensile modulus of at least 30 T / mm ² and a tensile strength of 300 kgf / so that it can withstand high centrifugal force.
Materials of at least mm ² are desirable. As a method of manufacturing the carbon fiber reinforced plastic cylinder, a sheet winding method, a hand lay-up method, or the like can be considered.However, in order to ensure uniformity of the density and dimensional accuracy of the processed carbon fiber reinforced plastic cylinder, a filament winding method is used. It is desirable to use the method. As the matrix at this time, an epoxy resin having high toughness is preferable, but the details are determined according to the environment in which the resin is used.

Next, a metal cylindrical container 2 having a projecting portion 3 formed on a peripheral surface thereof with a tapered portion fitted to the carbon fiber reinforced plastic cylinder 1 on its peripheral surface is prepared by machining. As the material of the metal cylindrical container, an aluminum alloy, a stainless steel, a titanium alloy, or the like having high wear resistance and corrosion resistance is determined from the usage environment. Then, the carbon fiber reinforced plastic cylinder 1 is placed on the outer periphery of the metal cylindrical container 2 so as to face up and down,
The container-shaped rotating body 8 in which the fitting surfaces 4 are brought into close contact at room temperature with an adhesive is completed. The rotation at the time of centrifugation is performed by rotating the drive shaft 6 in a configuration in which the end plate 5, the drive shaft 6, and the fastening portion 7 are added, for example.

[0015]

FIG. 3 shows an embodiment of the main part of FIG. 1 and shows the dimensional relationship of each part. A tensile strength 350 kg / mm ^2, tensile elastic modulus 60,000 / mm ² carbon fiber, a glass transition temperature of 160 ° C. of the epoxy resin to produce a carbon fiber reinforced plastic cylinder 1 with a matrix, by machining, the cylindrical end surface The cylinder was finished to a cylinder having an outer diameter of 200 mm and a maximum thickness of 13 mm with a 45 ° taper on the inner surface with respect to the center line of the cylinder. As a metal cylinder to which the carbon fiber reinforced plastic cylinder is attached, a cylindrical container 2 made of titanium alloy (Ti-6Al-4V) and having a minimum thickness of 2 mm and a center projecting portion 3 having a thickness of 11 mm and a bottom plate 9 having a thickness of 5 mm are forged and machined. Made from processing. In a state where the inner surface of the carbon fiber reinforced plastic cylinder and the outer surface of the titanium container can be fitted together, a rotating body was manufactured by bonding with an epoxy-based adhesive which was cured at room temperature. The height of the rotating body is 200 mm, the inner diameter is 170 mm, the height is 300 mm, and the width of the strip-shaped metal portion exposed on the outer periphery of the protrusion 3 is 15 mm.
mm. As in FIG. 1, the upper end face of the rotating body has a thickness of 5 mm.
The titanium disk 5 was placed, the drive shaft 6 was passed through the center, and fixed by the fastening portion 7, and a rotation test was performed up to 31,000 times per minute. No damage was found in the carbon fiber reinforced plastic part and the metal part in the test. Next, in order to simulate the discharge hole of the centrifugal separator, through holes having a radius of 4 mm were installed at intervals of 30 ° in the strip-shaped metal portion exposed on the outer periphery of the rotating body, and the same rotation was performed up to 35,000 times per minute. I did a test,
Also in this case, no damage was observed on the carbon fiber reinforced plastic part and the metal part.

[0016]

According to the present invention, since the carbon fiber reinforced plastic cylinder is installed outside the metal cylinder, deformation of the metal cylinder due to centrifugal force can be suppressed by the carbon fiber reinforced plastic. Further, since the discharge hole of the rotating body of the centrifugal separator can be provided in the metal cylindrical portion, machining such as drilling holes and threading in the carbon fiber reinforced plastic portion becomes unnecessary. In addition, as a material of the metal cylinder, the inner cylinder of the rotating body of the automatic discharge centrifugal separator can be used as a single body because it has high abrasion resistance and corrosion resistance, but is not suitable for high-speed rotation such as aluminum alloy, stainless alloy, titanium alloy, etc. Can be used. As a result, it becomes possible to manufacture a centrifuge capable of processing a large amount of liquid.

[Brief description of the drawings]

FIG. 1 shows the structure of a container-shaped rotating body made of carbon fiber reinforced plastic and metal of the present invention.

FIG. 2 is an enlarged view of a portion where a discharge hole is provided (a portion in FIG. 1).

FIG. 3 illustrates a detailed structure of a metal portion where a discharge hole is installed and a carbon fiber reinforced plastic portion around the metal portion, according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Carbon fiber reinforced plastic cylinder 2 Metal cylindrical container 3 Projection part 4 Fitting surface 5 End face plate 6 Drive shaft 7 Fastening part 8 Container-like rotating body 9 Bottom plate

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenji Kubomura 1618 Ida, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Nippon Steel Corporation Advanced Technology Laboratory (72) Inventor Osamu Yoshida 2-1-1 Toyosu, Koto-ku, Tokyo No.Ishikawa Shima-Harima Heavy Industries Co., Ltd.Tokyo Daiichi Plant (72) Inventor Masatoshi Utsunomiya 1-1-1, Toyosu, Koto-ku, Tokyo Ishikawa Shima-Harima Heavy Industries Co., Ltd.Tokyo Daiichi Plant (72) Inventor Toshiyuki Nakajima Tokyo 2-1-1, Toyosu, Koto-ku, Tokyo Ishikawa Shima-Harima Heavy Industries Co., Ltd.Tokyo First Factory (72) Inventor Masahiro Moriguchi 2-1 Okawacho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Mitsui Chemicals Co., Ltd. (72) Invention Person Yasuhisa Tanaka 2-1 Okawacho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside Mitsubishi Chemical Co., Ltd. (56) References JP-A-63-319073 (JP, A) JP-A-57-180453 (JP, A) JP-A-48-62057 (JP, A) JP-A-48-58465 (JP, A) JP-A-50-136378 (JP, A) JP-A-50-56331 ( JP, A) JP-A-63-305952 (JP, A) JP-A-53-53068 (JP, A) US Patent 3,797,737 (US, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B04B 7/08 B04B 1/14 B32B 1/02 B65D 8/08

Claims (1)

(57) [Claims] 1. A metal fiber reinforced plastic cylinder is vertically enclosed and adhered to an outer periphery of a bottomed metal cylinder and a protrusion provided near a center in the height direction of the outer periphery, and the metal cylinder is brought into close contact with the metal cylinder. A cylindrical double structure with the surface of the protrusion of the cylinder exposed, wherein the mating surface between each of the opposed end faces of the carbon fiber reinforced plastic cylinder and the metal cylindrical protrusion forms a tapered surface that expands toward the inside of the cylinder. And a tapered angle θ formed between the cylindrical axis direction and the tapered surface is 15 to 80 °.