JP2002242604A - Vane for air motor, method of manufacturing the vane, and air motor using the vane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the durability of a vane for air motor in an oilless air motor. SOLUTION: In this vane for air motor 17, a plurality of reinforcing fibers containing mixed powder comprising petroleum or coal binder pitch powder having a softness and petroleum or coal coke powder having no softness are used as a core material, and a soft sleeve formed with thermoplastic resin is installed around the periphery of the core material. The material thus obtained is used as a base material to form an inorganic fiber-reinforced carbon composite material, and phenolic resin of 3 to 15% is impregnated in the composite material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air motor vane used for an air motor for obtaining a rotational driving force by compressed air, a method for manufacturing the same, and an air motor using the same.

[0002]

2. Description of the Related Art Air motors are widely used because of their light weight and high output, and especially in places where fires are strictly prohibited, such as oil plants, in place of electric motors, which may cause sparks. An air motor that does not have such a fear is preferably used.

[0003]

However, since the rotor of the air motor rotates at a high speed, the vanes constituting a part of the rotor are severely worn and their life is short. Therefore, there is a disadvantage that maintenance and inspection must be performed frequently.

Further, in order to suppress the wear of the vane to some extent, a small amount of lubricating oil has been conventionally added to the compressed air to reduce the wear. It has achieved results.

[0005] On the other hand, it is becoming difficult to mix lubricating oil into compressed air, albeit in a very small amount, mainly in response to environmental problems under increasingly strict regulations. Therefore, an oil-free air motor that can operate without adding lubricating oil to compressed air is desired.

[0006] However, at present, it is not the case that an oilless air motor does not exist. However, the conventional oilless air motor often becomes inoperable due to a large amount of wear of the vane or a sudden breakage or seizure of the vane during operation. Therefore, the current situation is that it is not possible to sufficiently respond to consumers.

Various types of vane materials have been studied in the past. Among them, SC carbon in which metal in pores of a carbon substrate is melt-pressed and impregnated has obtained relatively good results. I have. Table 1 shows various properties of the SC carbon.

[0008]

[Table 1]

However, it is difficult to use a vane using SC carbon for a long time at present under the condition that the vane is broken in about 50 hours of operation.

The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a vane for an air motor capable of withstanding use for a long time, a manufacturing method thereof, and an air motor using the same.

[0011]

The features of the air motor vane of the present invention are as follows. (1) Impregnate the inorganic fiber reinforced carbon composite material with 3 to 15% of a phenol resin.

(2) Impregnate the inorganic fiber reinforced carbon composite material with 4 to 12% of a phenol resin.

(3) In the above item (1) or (2), the inorganic fiber reinforced carbon composite material is prepared from a softening petroleum or coal binder pitch powder and a non-softening petroleum or coal coke powder. A plurality of reinforcing fibers containing mixed powders are used as a core material, and a base material is provided around which a flexible sleeve made of a thermoplastic resin is provided.

(4) The phenol resin is a resol type resin.

The features of the method for manufacturing a vane for an air motor of the present invention are as follows.

(5) A plurality of reinforcing fibers including a mixed powder of a softening petroleum or coal-based binder pitch powder and a non-softening petroleum or coal-based coke powder is used as a core material, and An inorganic fiber reinforced carbon composite material is manufactured using a base material provided with a flexible sleeve made of a thermoplastic resin, and this is impregnated with 3 to 15% of a phenol resin.

(6) An air motor vane according to any one of the above (1) to (3) is provided.

(7) An air motor manufactured by the above manufacturing method is provided.

(8) The air motor according to the above (6) or (7) is an oilless air motor.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The air motor vane of the present invention
It is composed of an inorganic fiber reinforced carbon composite material and a phenol resin. As the inorganic fiber reinforced carbon composite material, for example, a material having a flexible intermediate material in the invention described in Japanese Patent Publication No. 4-72791 can be used.

This inorganic fiber reinforced carbon composite material is produced, for example, by the following steps. 1) A flexible intermediate material is prepared using reinforcing fibers, binder pitch powder, and coke powder. 2) The flexible intermediate material is used as a drawer sheet. 3) Laminate the sheets and perform hot press molding. 4) Carbide and graphitize the molded product.

Such an inorganic fiber reinforced carbon composite material has extremely high bending strength and is a high-quality molded product, and therefore has high practical value.

As the phenol resin, a resole type resin, a novolak type resin and the like can be used, but a resole type resin is particularly preferable in terms of impregnation.

The amount of the phenol resin impregnated in the inorganic fiber reinforced carbon composite material, that is, the resin impregnation rate (mass of the phenol resin impregnated / total mass of the air motor vane) must be 3 to 15%. Is 4-12
% Is more preferable. If the impregnation rate is less than 3%, the amount of wear of the air motor vane increases, and the bending strength decreases. On the other hand, when the impregnation ratio is larger than 15%, heat resistance is poor. These points will be described later.

In order to impregnate the inorganic fiber reinforced carbon composite material with a phenol resin, for example, a combination of the following steps can be used. 1) Dispose a vat (resin bath) containing a molten phenol resin in a vacuum oven. 2) Immerse the inorganic fiber reinforced carbon composite material in a resin bath. 3) The vacuum oven is depressurized and kept at a predetermined temperature for a predetermined time. 4) Take out the inorganic fiber reinforced carbon composite material in the resin bath. 5) The inorganic fiber reinforced carbon composite material is placed in an oven, kept at a predetermined temperature under an atmospheric pressure for a predetermined time, and cured.

Next, the air motor will be described. Figure 1
2 and FIG. 2 show a schematic configuration of an air motor including an air motor vane according to the present invention. 1 is a side sectional view, FIG. 2 is a front view, and FIG. 3 is a vertical sectional view taken along the line III-III in FIG. 1. The air motor of the present embodiment is a rotary vane type.

A cylindrical cylinder (3) is provided in the housing (1) so that the center of the cylinder chamber (2) is eccentric from the center of the outer shape. The rotor (4) is accommodated in the cylinder chamber (2) in an eccentric state so that its axis is aligned with the center of the outer shape of the cylinder (3) and substantially inscribed in one location of the cylinder chamber (2). ing. Shafts (5a) (5b) at both ends in the axial direction of the rotor (4)
Are at both axial ends of the cylinder (3),
Bearings (7) are mounted on support plates (6a) (6b)
a) It is rotatably supported via (7b).

The tip of one shaft portion (5b) is formed in a pinion (8), and this pinion (8) is connected to an output shaft (10) pivotally supported by a housing (1) with bearings (11a) (11b). ) Meshes with a gear (9) firmly fitted to the base end of the gear. The torque of the rotor (4) is reduced when transmitted from the pinion (8) to the gear (9),
The output shaft (10) protruding outward from the housing (1) is taken out from the distal end portion. The output shaft (10) is hermetically sealed to the housing (1) by a seal (12) provided adjacent to the back surface of the bearing (11b).

The cylinder (3) has an air supply port (13), an exhaust port (14), and an intermediate exhaust port (15). Rotor
(4) has, for example, five grooves (16
a) to (16e) are formed at equal intervals in the circumferential direction of the rotor (4). The vanes (17a) to (17e) are inserted into the grooves (16a) to (16e) so as to be slidable in the radial direction of the rotor (4).

An air supply port (13) and an exhaust port (1) on the inner peripheral surface of the cylinder chamber (2).
4), the sliding surface (18) formed between the vane (17a) and
In a state where the base end of (17e) is in contact with or close to the bottom surfaces of the grooves (16a) to (16e), the front end comes into contact and slides. The vane (17a)-
In a state where (17e) moves radially outward of the rotor (4) in the grooves (16a) to (16e) by centrifugal force, the tips of the vanes (17a) to (17e) come into contact and slide.

The air supply port (13), the exhaust port (14) and the intermediate exhaust port (15) are formed symmetrically with respect to the vertical plane. If arranged in this way, the roles of the air supply port (13) and the exhaust port (14) are exchanged, and if compressed air is supplied to the exhaust port (14) side,
The rotor (4) can be rotated in the opposite direction.

An air motor vane composed of an inorganic fiber reinforced carbon composite material and a phenol resin is manufactured by the following procedure. As the reinforcing fiber used in the inorganic fiber reinforced carbon composite material, a carbon fiber composed of 3000 filaments having a diameter of 10 μm and manufactured from petroleum pitch was used. The tensile strength, elastic modulus,
The elongations were 3.04 GPa, 216 GPa and 1.4%, respectively.

The carbon fiber was pulled out of the opener and introduced into a particle adhering device under the conditions of a feed speed of 50 m / min and a tension of 30 g. 400 g of petroleum-based binder pitch powder and 400 g of coke powder having the following composition and particle size are contained in the particle adhering device. Dry air or nitrogen is supplied from the lower part of the apparatus, and the particles are slightly fluidized.

[Petroleum-based binder pitch] Softening point 260 ° C. Volatile content 30% by mass Quinoline insoluble content 50% by mass Particle size 3-20 μm [Coal-based coke] Volatile content 1% by mass Particle size 3-10 μm

Next, a core material containing a binder pitch powder and a coke powder between fibers was supplied to a sleeve-covered crosshead by a particle adhering device, and polyethylene was coated therearound to a thickness of 8 μm. The core material coated with the sleeve was taken out at a speed of 50 m / min by a feed roller at a constant rate, and then wound up on a bobbin by a winding device. The obtained flexible intermediate material had the following composition. Mixed powder (binder pitch + coke) 58% by volume Carbon fiber 34% by volume Sleeve (inner diameter 2.5mm, wall thickness 8μm) 8% by volume

Next, this flexible intermediate material is molded at a molding temperature of 600.
Hot pressing was performed under the conditions of ° C, a molding pressure of 49 MPa, and a molding holding time of 20 minutes to obtain a unidirectional composite material. The bending strength of this composite material is 147 MPa and the density is 1.58 g / c.
m ³ . The fiber content at this time was 40% by volume. Further, the above composite material was placed in a nitrogen atmosphere for 1 hour.
Firing was performed at 500 ° C. for 30 minutes to obtain a CC composite. The bending strength of this C-C composite is 127M
Pa and the density were 1.80 g / cm ³ .

The above method was employed to impregnate the inorganic fiber reinforced carbon composite material with a phenol resin. The resin material and process conditions are as follows. Resole type resin (manufactured by Dainippon Ink and Chemicals, Inc., trade name: phenolite, model number: J-325) Resin bath temperature Approx. Oven treatment condition At 200 ° C under atmospheric pressure for 1-5 hours

The processing conditions were changed within the above range, and samples having different resin impregnation rates were prepared. The resin impregnation was measured by measuring the mass of the inorganic fiber reinforced carbon composite material before the treatment in advance, measuring the mass after the treatment, and calculating from the increased mass.

Each characteristic of the obtained sample was evaluated and summarized in Table 2. The bending strength was determined by a three-point bending test specified in JIS K7203. In Table 2, the evaluation of the amount of wear and the heat resistance is indicated by ○ for an appropriate one, × for an unsuitable one, and Δ for an unsuitable but practically acceptable one.

[0040]

[Table 2]

The flexural strength increases as the resin impregnation rate increases because the strength of the inorganic fiber reinforced carbon composite material as the base material is low. The amount of wear also tends to increase as the resin impregnation rate increases, and those with a resin impregnation rate of less than 3% are unsuitable, and preferably 4% or more.

As the heat resistance of the base material is about 600 ° C. and the heat resistance of the resin is about 200 ° C., the heat resistance tends to decrease as the resin impregnation rate increases. Those exceeding 15% are unsuitable, and preferably 12% or less.

The obtained sample was processed into the shape of a vane for an air motor, and was assembled into an existing air motor and subjected to a durability test. The sample used had a resin impregnation rate of 8%. Various mechanical properties of the sample having this composition were also evaluated, and the results are shown in Table 3.

[0044]

[Table 3]

At the same time, as a comparative example, a durability test of a vane using conventional SC carbon was also performed.

The air motor used in the durability test is of the rotary vane type shown in FIGS. 1 to 3 described above, and the specifications are shown in Table 4.

[0047]

[Table 4]

The operation pattern of the air motor in the endurance test is as shown in the diagram of FIG. 4, and the load pattern at that time is as shown in the diagram of FIG. One cycle is a repetition of 6 minutes, and the operation time per cycle is 2 minutes. Operating time 20
The air motor was disassembled and inspected at the time when the time reached 40 hours and 50 hours, and the dimensions of the air motor vane were measured. In addition, the presence or absence of abnormality in each part of the air motor was confirmed.

In the case of the air motor vane according to the present invention,
When the operation time reached 27.6 hours, 50 hours, and 100 hours, the air motor was disassembled and inspected, but no abnormality was found. When the operation time was 151.6 hours, the air motor stopped due to breakage of the air motor vane. did. At this time, the wear amount of the air motor vane was 2.05 mm, and the wear rate (wear amount per hour) was 0.0135 mm / hr.
Met.

In the case of the air motor vane of the comparative example, when the operation time was 49.7 hours, the air motor was stopped due to damage to the two air motor vanes. At this time, the abrasion amount of the air motor vane (the undamaged air motor vane) was 1.627 mm, and the abrasion rate (abrasion amount per hour) was 0.0327 mm / hr.

Comparing the above, the air motor vane according to the present invention has a durability time more than three times and a wear rate of about 41% as compared with the conventional product, and a remarkable effect was obtained.

[0052]

According to the present invention, the following effects can be obtained. According to the first to seventh aspects of the present invention, the life of the air motor vane is substantially the same as that of the oil supply type air motor even if the oil supply type air motor is not used. Thereby, the following effects can be obtained. 1) Lubricators and the like, which are indispensable for a lubricated air motor, are not required, and oil is not released to the atmosphere, thus preventing environmental pollution. 2) The frequency of maintenance and inspection of the air motor can be reduced. 3) The number of accidents during the operation of the air motor is reduced, and the reliability of the air motor is improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an embodiment of the device of the present invention.

FIG. 2 is a front view of the apparatus of FIG.

FIG. 3 is a cross-sectional view of the device of FIG. 1 as seen from the line III-III.

FIG. 4 is a diagram showing an operation pattern of an air motor in a durability test.

FIG. 5 is a diagram showing a load pattern of an air motor in an endurance test.

[Explanation of symbols]

 (1) Housing (2) Cylinder chamber (3) Cylinder (4) Rotor (5) Bearing (6) Support plate (7) Bearing (8) Pinion (9) Gear (10) Output shaft (11) Bearing (12) Seal (13) Air supply port (14) Exhaust port (15) Intermediate exhaust port (16) Groove (17) Vane (18) Sliding surface

Claims (8)

[Claims] 1. A vane for an air motor, wherein a 3 to 15% phenol resin is impregnated in an inorganic fiber reinforced carbon composite material. 2. A vane for an air motor, wherein the inorganic fiber reinforced carbon composite material is impregnated with 4 to 12% of a phenol resin. 3. The method of claim 1, wherein the inorganic fiber reinforced carbon composite material includes a plurality of reinforcing powders including a mixed powder of a softening petroleum or coal-based binder pitch powder and a non-softening petroleum or coal-based coke powder. 2. A base material comprising a core material made of a fiber for use and a flexible sleeve made of a thermoplastic resin provided around the core material.
Or the vane for an air motor according to 2. 4. The air motor vane according to claim 1, wherein the phenol resin is a resol type resin. 5. A core material comprising a plurality of reinforcing fibers including a mixed powder of a softening petroleum or coal-based binder pitch powder and a non-softening petroleum or coal-based coke powder. A method for producing a vane for an air motor, comprising: producing an inorganic fiber reinforced carbon composite material based on a base material provided with a flexible sleeve made of a plastic resin, and impregnating the composite material with 3 to 15% of a phenol resin. 6. An air motor comprising the air motor vane according to claim 1. 7. An air motor including an air motor vane manufactured by the method according to claim 5. 8. The air motor according to claim 6, wherein the air motor is an oilless air motor.