JPH10153195A - Blade for compressor and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the deformation of a blade and the wear and damage to the blade at the rotor rotation time by containing a fiber for reinforcing orientated with a specific angle for a rotor axis direction at the assembly time. SOLUTION: Blades 20, 20a, 20b are formed by a thermal flexible synthetic resin containing a fiber for reinforcing 21 orientated by 60 deg.-90 deg. for the rotor axis direction X at the assembly time and having a heat resistance of a thermal deformation temperature 130 deg.C or more. In a manufacturing method, when the fiber for reinforcing 21 is contained in a melted resin for molding and assembled to the rotor, the blade is formed by an injection molding, while making the direction in which the fiber 21 is orientated by 60 deg.-90 deg. for the rotor axis direction X to a melted resin flow direction at the time assembled to the rotor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade mounted on a rotor of a compressor using compressed air as a power source, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Air tools such as a coating gun, an air driver, an impact wrench, and an air grinder have a compressor which is rotated by compressed air. The rotor, which is a main component of the compressor, has a plurality of grooves formed therein, and blades (air tool vanes) are provided in each groove so as to be slidable in a direction toward the center of the rotation shaft. One example (Japanese Utility Model Laid-Open No. 63-64472) is shown below with reference to FIGS. In the figure, (1) is a compressor,
(2) is a hammer. The hammer (2) includes an anvil (3) and means for converting the rotational force of the compressor (2) into an intermittent rotational motion of the anvil (3).
The anvil (3) is intermittently rotated by a constant rotation operation of the compressor (1).

The compressor (1) has a cylindrical rotor (5) having a shaft (4) penetrated at both ends, a cylinder (6) covering the outer peripheral side surface of the rotor (5), and an airtight rotor (5). A rear plate (7) and a front plate (8) are provided on both sides of an opening of the cylinder (6) to close the cylinder. On the outer surface of the rotor (5), a plurality of grooves (9) are formed radially in parallel with the axis (4), and each of the grooves (9) is formed.
A blade (10) is inserted therein so as to be able to slide radially with respect to the shaft (4). Bearings (11) for rotatably holding the shaft (4) of the rotor (5) on the rear plate (7) and the front plate (8), respectively.
(12) is provided. The inner space (13) of the cylinder (6) accommodating the rotor (5) has an inner diameter larger than the outer diameter of the rotor (5). 6) A position eccentric from the center of the shaft (4) of the rotor (5) mounted inside.

The rear plate (7) and the front plate (8) are provided with blade introduction air introduction passages (14) (15) which open into the internal space (13) of the cylinder (6). Compressed air is introduced into the air introduction passages (14) and (15) by a conventionally known means so that the compressed air is sent to the root side of the shaft (4) in the groove (10) of the rotor (5). The opening positions of the air introduction passages (14) and (15) are set. Notches (16) are formed at upper and lower portions of the blade (10) located on the base side of the groove (9) so that the blade (10) can slide with compressed air efficiently. .

During operation of the compressor, compressed air is introduced from the air introduction passages (14) and (15) to the base of the groove (9) of the rotor (5), and the compressed air causes the blade (10) to move into the cylinder (6). The blade (10) is pushed out in the direction of the wall, thereby preventing the blade (10) from sticking to the groove (9) by the oil at the time of starting.

Conventionally, a phenol resin laminate containing cotton cloth or an epoxy resin laminate containing cotton cloth is used for the blade (10). During operation, the rotor (5) is about 3000 rpm
At high speed. At this time, the rotor (1) rotates in the region where the rotor outer peripheral surface contacts the wall surface of the internal space (13) due to the eccentricity of the shaft (4).
0) fits in the groove. On the other hand, as shown in FIG.
In a region where the rotor outer peripheral surface is separated from the wall surface of the internal space (13) due to the eccentricity of the shaft (4), a part of the blade (10) radially jumps out of the groove due to centrifugal force and seals while contacting the wall surface at the end surface. Slidably rotates and compresses air.

[0007] Therefore, a bending stress is applied to the protruding portion along the rotational direction, and furthermore, the protruding portion comes into contact with the groove entrance to be bent and deformed. A large frictional force is applied to the inner surface of the bent portion (10a) to cause abrasion, which causes problems such as a reduction in output due to poor rotation and seizure due to abrasion powder. ) May be broken. Therefore, conventionally, as shown in FIG.
8) For example, a blade (17) containing carbon fiber is known, and at the time of production, the blade (17) is injection-molded with a molding resin containing the reinforcing fiber (18).

The reinforcing fibers (18) are contained so that the blades (17) are oriented in the rotor axial direction (X) when assembled to the rotor (5). Therefore, as shown in FIG. 4A, the gate (19) is parallel to the rotor axis direction (X).
And the molten resin containing the reinforcing fiber is injected into the mold cavity, and the reinforcing fiber (18) contained in the blade (17) is oriented parallel to the direction of the rotor axis (X).

[0009]

The problem to be solved is that the blades (10) and (17) made of a phenol resin or epoxy resin laminate need to be machined over the entire surface, and have large dimensional variations. The reinforcing fiber (18) contained in the blade (17) is oriented parallel to the rotor axis direction (X), and the orientation direction (X) is parallel to the center axis direction of the rotational moment of the rotor (5). The blades (17) are still deformed in the direction of rotation of the rotor and are liable to be worn and broken, and are insufficiently reinforced.

An object of the present invention is to eliminate the need for machining,
An object of the present invention is to provide a long-life compressor blade with excellent wear resistance.

[0011]

SUMMARY OF THE INVENTION The present invention relates to a blade for a compressor, which is mounted on a rotor of a compressor using compressed air as a power source, and is oriented at 60 to 90 degrees with respect to the axial direction of the rotor at the time of mounting. It is characterized by being formed of a thermoplastic synthetic resin having a heat resistance of 130 ° C. or higher and a heat distortion temperature of 130 ° C. or more. Then, when assembled to the rotor, the reinforcing fibers are formed by injection molding with the direction in which the reinforcing fibers are oriented at 60 to 90 with respect to the rotor axial direction as the molten resin flow direction.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a compressor blade and a method for manufacturing the same according to the present invention will be described below with reference to FIGS. First, FIG. 1A shows an embodiment of a compressor blade (20) according to the present invention.
When the blade (20) is assembled to the rotor (5) (see FIGS. 5 and 6), the reinforcing fiber (21) oriented at 60 ° to 90 ° with respect to the rotor axial direction (X) is included. , FIG. 1 (b)
(C) shows a blade (20a) whose orientation direction (Ya) is 60 ° and a blade (20b) whose orientation direction (Yb) is 90 °. Then, since the orientation directions (Ya) and (Yb) greatly intersect with the direction of the central axis of the rotational moment of the rotor (5), the blade (20) is hardly deformed in the rotor rotational direction, the wear amount is reduced, and the breakage is caused. It becomes difficult to do.

In manufacturing the blades (20a) and (20b), for example, as shown in FIG.
When 2) is used, 60 ° to 90 ° with respect to the rotor axial direction (X)
The injection port of the pin gate (22) may be arranged in parallel to the direction of °, and the molten resin containing the reinforcing fiber (21) may be injected into the mold cavity from that direction and injection-molded. Then, most of the reinforcing fibers (21) contained in the resin are oriented in the resin in a direction of 60 ° to 90 ° with respect to the rotor axial direction (X), and the gate portion is cut and removed after molding.

As shown in FIGS. 2 (b) and 2 (c), when the fan gate (23) is used, the fan is arranged in parallel to the direction of 60 to 90 ° with respect to the rotor axial direction (X). The injection port of the gate (24) may be provided, and the resin containing the reinforcing fiber (21) may be injected into the mold cavity from that direction to perform injection molding. Then, most of the reinforcing fibers (21) contained in the resin are oriented in a direction of 60 ° to 90 ° with respect to the rotor axial direction (X), and the gate portion is cut and removed after molding.

Further, when the molding resin is a thermoplastic synthetic resin having a heat resistance of a heat deformation temperature of 130 ° C. or more, it can withstand high air pressure and high rotation, and can be continuously dimensioned with high precision by injection molding. A uniform blade (20) can be manufactured.

Table 1 shows the measurement results of the durability test. In the table, as the resin substrate, PI is the heat distortion temperature 238.
° C thermoplastic polyimide resin (Mitsui Toatsu Chemical: AUR
UM PD450), PEN is a polyethernitrile resin with a thermal deformation temperature of 165 ° C (ID300 from Idemitsu Kosan Co., Ltd.), PPS is a polyphenylene sulfide resin with a thermal deformation temperature of 138 ° C (Toprene: T4), and POM is heat Polyacetal resin with a deformation temperature of 110 ° C (manufactured by Polyplastics: Duracon M90
-71). ｛However, heat deformation temperature is ASTM D64
8 (18.6 kgf / cm ² ). ＣＦ As the reinforcing fibers, CF is a carbon fiber having an average fiber length of 0.7 mm (Kureha Chemical Co., Ltd .: Creca Chop M107T), and ARF is an average fiber length of 0.25 m.
m is an aromatic polyamide fiber (manufactured by Nippon Aramid Co., Ltd .: Twaron-0.25 mm-cut fiber). Although not shown in the table, heat-resistant fiber such as titanate fiber may be used.
As solid lubricants, GRP-1 and GRP-2 are graphite powders (GRP-1 is Nippon Graphite Co., Ltd .: ACP, GRP-2 is Kanebo Co., Ltd.):
Bellpearl-C2000) and PTFE indicate ethylene tetrafluoride resin powder (KTL610, manufactured by Kitamura Co., Ltd.).

[0017] The ratio of each of the above raw materials shown in the table (% by weight)
And dry-mixed using a Henschel mixer, melt-extruded with an extruder and granulated, and injection-molded under conditions suitable for each resin base material, 60 × 60 × 1.2 mm
Into a plate material. Since a fan gate is provided on one side of the plate-shaped material, reinforcing fibers are oriented in the formed plate-shaped material in parallel from the gate. From this plate-shaped material, as shown in FIG. 3, the molten resin flow direction (the orientation direction of the reinforcing fibers) is (Y), and the reinforcing fibers are oriented at 90 ° to the rotor axis direction (X). (20b) and the blade (20a) oriented at 60 ° to the rotor axis direction (X)
Then, a blade (21a) oriented at 45 ° to the rotor axis direction (X) and a blade (21b) oriented parallel (0 °) to the rotor axis direction (X) are cut out. Assemble these blades to the air tool, rotor rotation speed 3000rpm, ambient temperature
A durability test was performed at 35 ° C and an operation time of 1000 hours. If the amount of abrasion on the end face is 1.00 mm or less after 1000 hours of the durability test, it is within the allowable range.

[0018]

[Table 1]

According to the above measurement results, Examples 1, 2, 3
Since the heat deformation temperature of the resin base material is higher than 130 ° C and the orientation of the reinforcing fibers is oriented at 60 ° to 90 ° with respect to the rotor axis, the amount of wear on the end face is small and the blades are not damaged . From the results of Example 1 and Comparative Example 4, and Example 2 and Comparative Example 5, as the orientation of the reinforcing fiber is closer to parallel to the rotor axis, the amount of wear on the end face is smaller, but it comes into contact with the rotor groove inlet on the blade side face. It can be seen that the parts were severely worn and the blades were cracked during the durability test. In Comparative Example 6, although the orientation of the reinforcing fibers was 90 ° with respect to the rotor axial direction (X), the heat deformation temperature was 130 ° C or less, so there was no cracking of the rotor, but the end face was worn. The amount was well above the acceptable range. Furthermore,
The material used in Example 1 was used to manufacture a blade injection molding die having a shape according to the present invention, and 100 moldings were continuously performed. Could be formed.

[0020]

According to the present invention, there is provided a blade to be mounted on a rotor of a compressor using compressed air as a power source, the reinforcing blade being oriented at 60 ° to 90 ° with respect to the axial direction of the rotor at the time of mounting. From this, the deformation of the blades during rotation of the rotor is reduced, and the wear and breakage of the blades can be significantly reduced, and problems such as output reduction due to poor rotation and seizure due to abrasion powder are eliminated, forming a blade with extremely long life. it can. Further, by using a thermoplastic resin as the material of the blade, it is possible to continuously manufacture blades of uniform dimensions with high precision by injection molding, and machining is not required.

[Brief description of the drawings]

FIG. 1A is a perspective view showing an embodiment of a compressor blade according to the present invention. (B) is 60 in the rotor axis direction.
FIG. 1 is a front view showing an embodiment of a compressor blade according to the present invention containing oriented reinforcing fibers. (C) is a front view showing an embodiment of the compressor blade according to the present invention containing reinforcing fibers oriented at 90 ° to the rotor axis direction.

FIG. 2A is a perspective view of a pin gate illustrating an embodiment of a method for manufacturing a compressor blade according to the present invention. (B)
(C) is each perspective view seen from the different direction which shows embodiment of the manufacturing method of the compressor blade which concerns on this invention.

FIG. 3 is a perspective view of a mold for a fan gate showing a means for manufacturing a compressor blade containing reinforcing fibers oriented at 90 °, 60 °, 45 °, and 0 ° with respect to the rotor axis direction.

FIG. 4A is a perspective view showing an example of a conventional compressor blade and a gate. (B) is a top view of a compressor blade showing a conventional problem.

FIG. 5 is a longitudinal sectional view showing an example of an air tool.

FIG. 6 is an exploded perspective view of a compressor of the air tool in FIG. 5;

[Explanation of symbols]

 20, 20a, 20b Compressor blade 21 Reinforcing fiber X Rotor axial direction Ya Reinforcing fiber orientation direction (60 °) Yb Reinforcing fiber orientation direction (90 °)

Claims (3)

[Claims] 1. A compressor mounted on a rotor of a compressor using compressed air as a power source, the compressor comprising reinforcing fibers oriented at 60 ° to 90 ° with respect to the axial direction of the rotor at the time of mounting. Wings. 2. The compressor blade according to claim 1, wherein the blade is formed of a thermoplastic synthetic resin having a heat resistance of a heat distortion temperature of 130 ° C. or higher. 3. A method in which a reinforcing fiber is contained in a molten resin for molding and when the reinforcing fiber is assembled to a rotor, the direction in which the reinforcing fiber is oriented at 60 ° to 90 ° with respect to the axial direction of the rotor is defined as injection flow of the molten resin. The method for manufacturing a compressor blade according to claim 1, wherein the blade is formed by: