JPS63143927A - High-speed rotary element of fiber-reinforced plastic - Google Patents

Abstract

PURPOSE:To enhance the performance and reliability of a high-speed rotary element, by determining a displacement value of a peripheral part of fiber- reinforced plastic circular plate, of an engagement part of a rotary cylinder at the time of rated rotation, and an interference value at the engagement part so as to satisfy a specific formula. CONSTITUTION:An end plate 1 is in the form of a disc having a symmetrical intraplane rigidity to a neutral plane. Then a displacement value of the end plate 1 and a rotary cylinder 2 at a engagement part at the time of rated rotation and an interference value at the engagement part between these two components are determined so as to satisfy a following formula. cylinder <=u end plate +delta wherein u cylinder represents a radial direction displacement value at the time of rated rotation of the engagement part (inner peripheral plane) of a rotary cylinder, u end plate represents a radial direction displacement value at the time of rated rotation of the engagement plane (outer peripheral plane) of an end plate, and delta represents an interference value of the engagement part under a stationary condition. If the afore-mentioned formula is satisfied, a clearance 4 between the end plate 1 and the cylinder 2 does not generate, thus maintaining air-tightness and rigidity.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is a rotating body made of fiber reinforced plastics (FRP) made of a cylinder with end plates attached to both ends, and in particular improves the end plate attachment portion. This product relates to high-speed rotating bodies that have improved performance at rated rotation and reliability of hermetic sealing.

[Conventional technology]

From the perspective of increasing speed, FRP is more suitable than metal because it is lightweight and has excellent specific strength.
In gas centrifuges and the like that rotate at ultra-high speeds, consideration is being given to using FRP for separation cylinders.

This high-speed rotating body made of FRP requires end plates corresponding to lids at both ends of the cylinder depending on the purpose, but in this case,
Since it is impossible to integrally connect the cylinder and the end plate using continuous fibers, a method is generally adopted in which cut-formed end plates are fitted into both ends of the cylinder and bonded and integrated.

In addition, the high-speed rotating body with end plates obtained in this way is
It is required that the end plate follow the radial displacement of the cylinder caused by centrifugal force during rotation, and therefore, for the purpose of obtaining this radial followability, the umbrella shown in Fig. 2, which can easily be displaced in the radial direction, is used. The shaped end plate 1 is used legally in some areas.

[Problem that the invention seeks to solve]

However, as can be seen in Figure 3, where the shape when at rest is shown by a solid line and the shape when rotating is shown by a chain line, the umbrella-shaped end plate deforms in the radial direction and simultaneously deforms in the axial direction when rotating. It also transforms.

For this reason, if we focus on the fitting part between the cylinder 2 and the end plate 1, which are not connected to the fibers, the adhesive resin is torn by the deformation force, creating a gap 4 between the fitting surfaces as shown in Fig. 4, and the rotating body There has been a problem that the airtightness of the fitting is deteriorated or the rigidity of the fitting portion is reduced, which adversely affects rotational performance.

[Means for solving problems]

In this invention, in order to eliminate the above-mentioned problems, the end plate is formed into a disk shape whose in-plane rigidity is symmetrical with respect to the neutral plane. Further, the outer circumferential surface of the end plate is made parallel to the axis like the inner circumferential surface of the rotating cylinder.

Furthermore, the displacement amount at the rated rotation of the end plate, the displacement amount at the rated rotation at the fitting part of the rotating cylinder that tightly fits the end plate, and the interference between the end plate and the cylinder, 1 cylinder: rotating cylinder Amount of radial displacement of the mating surface (inner circumferential surface) of the end plate at rated rotation U End plate: Radial displacement of the mating surface (outer circumferential surface) of the end plate at rated rotation ■ δ: Between the rotating cylinder and the end plate It is determined so that the expression δ≧U cylinder−U end plate is satisfied when expressed by the interference at rest.

In addition, in order to avoid damage to the components when stationary, δ should be tightened within a range in which the force does not exceed the radial compressive strength of the end plate and the radial expansion strength of the cylinder side.

(Function) A disk-shaped end plate whose in-plane rigidity is symmetrical with respect to the neutral plane is deformed in a rotational stress field symmetrically with respect to the neutral plane. The degree remains unchanged even in the rotational stress field.

In addition, the tightness of the fitting part satisfies the conditions described in the previous section, and therefore, no tensile force acts on the adhesive and fingers of the fitting part even in the rotational stress field, and the gap between the end plate and the cylinder This prevents the occurrence of air leakage and maintains airtightness and rigidity.

〔Example〕

FIG. 1 shows a specific example of this invention. This high-speed rotating body includes an end plate 1 made of carbon fiber reinforced plastics and a cylinder 2.
, and a reinforcing cylinder 3 are the main components. End plate 1
Of course, the in-plane stiffness of is symmetrical with respect to the neutral plane, and
The outer peripheral surface of the end plate intersects two parallel end surfaces at right angles. The reinforcing cylinder 3 is provided on the outer periphery of the cylinder 2 at a portion that includes the fitting part as necessary, for the purpose of reinforcing the cylinder 2 and contributing to radial followability with respect to the end plate, and the reinforcing cylinder 3 is provided on the outer periphery of the cylinder 2 at a portion that includes the fitting part, and has elasticity in the circumferential direction. The ratio is higher than that of cylinder 2.

Note that contributing to radial followability means that the smaller the amount of radial displacement during rotation of the fitting portion of the cylinder 2 by the reinforcing cylinder 3, the smaller the amount of followability required of the end plate. This means that even with the end plate of the present invention, which is less likely to deform in the radial direction than the umbrella-shaped end plate, good followability can be obtained.

More detailed examples will be described below.

A high-speed rotary body with a rated circumferential speed of 400 m/see was fabricated with a fitting part having the structure shown in FIG. 1 using an end plate 1, a cylinder 2, and a reinforcing cylinder 3 having the following specifications. The interference between the end plate 1 and the cylinder 2 is
It is 0.06 mm per radius.

End plate Shape: Flat disk Dimensions: Outer diameter 100 mm, wall thickness 4.811 mm Material: Carbon fiber reinforced plastics (CFRP) After laminating carbon fiber orthogonal crosses with 30 inch pinch shifts in the circumferential direction, molding rigidity: In-plane modulus of elasticity: approx. 5000 kg/as" Cylinder Dimensions: Inner diameter 100mm, wall thickness 21mm Material: CFRP Rigidity: 12000kg/■, 2 (circumferential) Reinforced cylinder dimensions: Inner diameter 104mm, wall thickness 4-1mm Material: CFRP Rigidity: 1B000 kg/2 (circumferential direction) In this high-speed rotating body, when the end plate and the cylinder are rotated individually, the amount of radial displacement at the rated circumferential speed of 400/see is 0. 046 crane, cylinder becomes 0.097 m-.

Therefore, in a fitting structure with 0 interference, there will be a gap of 0.051+n per radius between the end plate and the cylindrical fitting, but the actual interference is 0.06 am per radius, so at the rated circumferential speed. Even when tightening, the force is maintained, thereby achieving the object of the invention.

〔effect〕

As described above, this invention makes the end plate disk-shaped so that its in-plane rigidity is symmetrical with respect to the neutral plane, and furthermore, even in the rotational stress field, an interference is left between the end plate and the cylinder. Because it has been decided that the rotational performance will not be affected, the airtightness and rigidity of the fitting part between the end plate and the cylinder can be maintained, and a liquid such as gas can be sealed or circulated inside. The effect of this method is that it can greatly contribute to improving the performance and reliability of the high-speed rotating body used.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a part of an example of a high-speed rotating body according to the present invention, FIG. 2 is a sectional view of a conventional rotating body using an umbrella-shaped end plate, and FIG. 3 is a sectional view of a conventional rotating body using an umbrella-shaped end plate. FIG. 4 is a schematic diagram showing a deformed state under a rotational stress field, and FIG. 4 is a cross-sectional view showing a fitted state of an umbrella-shaped end plate under a rotational stress field. 1... End plate, 2... Cylinder, 3...
...Reinforcement cylinder, 4...Gap. Patent Applicant Sumitomo Electric Industries Co., Ltd. Agent Kama 1) Text 2-ku

Claims (1)

[Scope of Claims] A high-speed rotating body comprising a rotating cylinder made of fiber-reinforced plastics and end plates made of fiber-reinforced plastics integrally bonded to both ends of the cylinder, wherein the end plates are arranged in-plane with respect to a neutral plane. It has a disc shape with symmetrical rigidity, and the amount of displacement at the rated rotation of the rotating cylinder at the end plate and the fitting part and the interference between the two satisfy the formula: u cylinder ≦ u end plate + δ. A high-speed rotating body characterized by: However, u Cylinder: Amount of radial displacement of the fitting surface (inner peripheral surface) of the rotating cylinder at rated rotation u End plate: Amount of radial displacement of the fitting surface (outer peripheral surface) of the end plate at rated rotation δ: Interference between rotating cylinder and end plate when stationary