JPH05256280A - Fluid compressor - Google Patents

Abstract

PURPOSE:To provide a fluid compressor of helical blade type wherein compressing ability can be maintained over a long time by providing a blade excellent in durability without worsening a seal property between operating chambers. CONSTITUTION:A blade 115 of constituting a fluid compressor of helical blade type has a constitution formed of a core material 1, intermediate material 2 and a surface layer material 3. The core material 1 is formed of a fiber reinforced material of metal having 0.8 to 1.5X10<5>N/m<2> Young's modulus or thermoplastic resin having a softening point of 200 deg.C or more, the intermediate material 2 consists of fluororesin having a softening point of 280 deg.C or more, and the surface layer material 3 is formed of fiber reinforced material of fluororesin having a softening point of 280 deg.C or more.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a helical blade type fluid compressor suitable for compressing refrigerant gas in a refrigeration cycle.

[0002]

2. Description of the Related Art Conventionally, reciprocating type, rotary type and the like have been known as general compressors. In recent years, a helical blade type fluid compressor has been proposed in which the refrigerant flowing from the suction side of the cylinder into the working chamber is sequentially transferred to the working chamber on the discharge side of the cylinder to be compressed and then discharged to the outside.

An example of this helical blade type compressor will be described with reference to FIG. As shown in FIG. 2, this compressor is arranged with a cylinder 107 which is rotated by a driving means 105 composed of a stator 101 and a rotor 103, and eccentric by e in the cylinder 107, and with respect to the cylinder 107 via an Oldham ring 109. And a piston 111 capable of relatively rotating. Piston 111
The outer circumferential surface of the groove 11 has a spiral groove 11 over substantially the entire length thereof.
3 is formed. The pitch of the grooves 113 gradually decreases from one end (the suction side on the right side in the drawing) of the piston 111 to the other end (the discharge side on the left side in the drawing). A spiral blade 115 is fitted in the groove 113 so as to be able to move in and out, and the outer peripheral surface of the blade 115 is in contact with the inner peripheral surface of the cylinder 107. The piston 111 is the cylinder 10
Since it rotates at a position eccentric with respect to 7, the relative speed difference that changes in one rotation as one cycle is generated between the outer peripheral surface of the piston and the inner peripheral surface of the cylinder facing the piston. Therefore, a plurality of working chambers 117 are formed in the space between the piston 111 and the cylinder 107 along the axial direction by the blade 115 fitted in the spiral groove 113 so as to be able to move in and out. At this time, the working chamber 117 has a volume equal to that of the blade 115.
Is determined by the pitch of the spiral groove 113 into which is fitted, but since the pitch of the groove 113 gradually decreases from the suction side to the discharge side, the volume of the working chamber 117 also gradually decreases. Become. Therefore, the refrigerant is gradually compressed and discharged to the outside while being sequentially transferred toward the discharge side.

Conventionally, a thermosetting resin (for example, phenol resin, polyimide resin) is used as a highly heat-resistant sliding member applied to the use of such a blade of a fluid compressor.
Filled with carbon fiber, glass fiber, aramid fiber, etc., or thermoplastic resin (eg aliphatic polyamide, polyacetal, ultra high density polyethylene) filled with carbon fiber, glass fiber, aramid fiber, etc. short fiber Has been used. Furthermore, in order to supplement the heat resistance and the chemical resistance, the use of a fluorine-based resin, polyamide imide, or polyether ether ketone as the thermoplastic resin has also been studied.

[0005]

However, when the above-mentioned conventional heat-resistant sliding member is used in an environment where it is twisted and bent under a high temperature atmosphere, it is generally hard and brittle. However, there are problems such as insufficient heat resistance and inability to maintain the shape due to cold flow. In particular,
When these are used as blades of a helical blade type fluid compressor, the following problems occur.

In the compressor, since the fluid is sequentially compressed and transferred from the suction side to the discharge side, each working chamber 11
A large differential pressure is generated between 7 and 7. This differential pressure is the working chamber 117
Acts as a force F for pressing the blade 115 that forms the pressure to the low pressure side, so that the blade 115 is inclined and deformed to the low pressure side. When the blade 115 is deformed, the contact with the inner peripheral surface of the cylinder 107 is likely to be unstable, and the sealing performance is significantly reduced, which adversely affects the compression efficiency. Further, since the side surface of the blade 115 moves up and down while making strong contact with the edge portion P of the spiral groove 113 provided on the piston 111 side, it is easily worn and there is a problem in terms of durability. Therefore, the sliding member used as the blade of the helical blade type fluid compressor is required to have appropriate elasticity and not be plastically deformed.

An object of the present invention is to provide a fluid which is properly fitted in the spiral groove, has excellent durability, does not impair the sealing property between the working chambers, and is capable of maintaining the compression ability for a long time. To provide a compressor.

[0008]

The fluid compressor of the present invention comprises:
The blade has a structure including a core material, an intermediate material and a surface layer material, and the core material is 0.8 to 1.5 × 10 ^5. N / m ² Of a fiber having a Young's modulus of a metal or a thermoplastic resin having a softening point of 200 ° C. or higher, an intermediate material of a fluororesin having a softening point of 280 ° C. or higher, and a surface layer material of 2
It is characterized by comprising a fiber reinforced body of a fluororesin having a softening point of 80 ° C. or higher.

In the present invention, the core material, the intermediate material, and the surface layer material constituting the sliding member used as the blade exhibit the functions of shape retention, flexibility and sealability, and friction and wear resistance. Hereinafter, the materials forming each member will be described in more detail.

The core material ensures heat resistance and is easy to mold.
From a viewpoint, 0.8 to 1.5 × 10^Five N / m² Young's modulus
Having a softening point or having a softening point of 200 ° C or higher
It is composed of a fiber reinforced plastic resin.

0.8 to 1.5 × 10 ⁵ N / m ² Examples of the metal having a Young's modulus include stainless steel, Ni-plated pure copper, and Ni-plated phosphor bronze, which have appropriate elasticity. Applying Ni plating to copper is a copper refrigerant (CFC)
This is because resistance to is weak.

Examples of the thermoplastic resin having a softening point of 200 ° C. or higher include polyether ether ketone, polyether imide, polyphenylene sulfide, polyether sulfone, fluorine resin (eg, tetrafluoroethylene-hexafluoropropylene copolymer, tetra Fluoroethylene-perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether copolymer) and the like. Thermoplastic resins can be used in films, sheets,
What is marketed as a board material can be used. Examples of the reinforcing fiber include cloth of PAN-based carbon fiber or meta- or para-based aramid fiber. A woven body of carbon fiber or aramid fiber and steel may be used. The reinforcing fibers are selected according to the mechanical strength required for the blade. A core material made of a fiber reinforced body can be manufactured by impregnating a cloth of reinforcing fibers with a thermoplastic resin by hot compression molding (hot melt method). Also, as the core material, a mixed woven body, a mixed woven body, or an alternate laminated body of carbon fiber or aramid fiber and a thermoplastic resin (polyether ether ketone, polyphenylene sulfide, polyether imide, polyether sulfone, etc.) is used. May be. In the present invention, the content of the thermoplastic resin in the fiber reinforced body is preferably 30 to 60% by weight, and more preferably 40 to 50% by weight in consideration of strength. In addition,
The upper limit of the softening point of the thermoplastic resin is not particularly limited and is 400
It is also possible to use a thermoplastic resin having a high softening point of about 0 ° C.

The intermediate material is a fluorine-based resin having a softening point of 280 ° C. or higher, for example, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-perm, from the viewpoint of heat resistance, moldability and chemical resistance. Fluoroalkyl vinyl ether copolymer, tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether copolymer, fluorine rubber (for example, vinylidene fluoride copolymer, tetrafluoroethylene-propylene copolymer, tetrafluoroethylene-perpolymer Fluoromethyl vinyl ether copolymer). A product obtained by molding these fluororesins into a shape of a tube, a round bar, a square bar, a perforated square bar or the like is used as an intermediate material. The upper limit of the softening point of the fluororesin is not particularly limited, and it is possible to use a fluororesin having a high softening point of about 350 ° C.

The surface layer material is composed of a fiber reinforced body of a fluororesin having a softening point of 280 ° C. or higher from the viewpoints of slidability, heat resistance and moldability. In order for the surface layer material to exhibit good slidability, the coefficient of static friction is preferably 0.1 or less. Examples of the fluorine-based resin include a tetrafluoroethylene-hexafluoropropylene copolymer, a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, a tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether copolymer, and the like. The fluororesin is used, for example, in the form of a tube made of a heat shrink film. Examples of the reinforcing fiber include cloth of PAN-based carbon fiber or meta- or para-based aramid fiber. The cloth is used, for example, in the form of a sleeve or a tube. In the present invention, the content of the fluororesin in the fiber reinforced body is 30 to 6
0% by weight is preferable, and if strength is taken into consideration, it is 40-50.
Weight percent is more preferred. The upper limit of the softening point of the fluorine-based resin is not particularly limited here as well, and it is possible to use a fluorine-based resin having a high softening point of about 350 ° C.

Further, a solid lubricant may be added to the fluororesin constituting the surface layer material. As the solid lubricant, a layered structure compound (for example, MoS ₂ , SbO ₃ , B
N, PbO, CaF ₂ , graphite, graphite fluoride), non-layered structure compounds, soft metals (eg Pb, S)
n, Au, Ag, Cu) and the like. The addition amount of the solid lubricant is preferably 5 to 10% by weight based on the fluororesin.

The surface layer material comprising a fiber reinforced body can be produced by impregnating a cloth of reinforcing fibers with a thermoplastic resin by hot compression molding (hot melt method). With respect to the surface layer material, it is preferable to adjust the exposed state of the reinforcing fibers in the surface layer portion (portion in contact with the partner material) according to the type of the mechanism of wear that occurs with the partner material. For example, when adhesive wear occurs, do not expose the reinforcing fibers and dozens to hundreds of μs from the surface layer to the reinforcing fibers.
It is preferable that a fluorine-based resin layer of m is provided.
When abrasive wear occurs, it is preferable to expose the reinforcing fibers to the surface layer portion.

The blade according to the present invention is formed by molding a core material,
It can be manufactured by molding the surface layer material, and further by combining with the intermediate material and molding. At this time, it may be formed into a spiral shape in accordance with the shape of the blade from the beginning, or may be formed into a spiral shape after forming a rod-shaped sliding member.

[0018]

Since the blade constituting the fluid compressor of the present invention is composed of the core material, the intermediate material and the surface layer material having a predetermined function, the deformation is small even if the pressing force due to the differential pressure acts in the working chamber. It can be suppressed. As a result, good sealability between the working chambers is ensured, and the blade does not come into strong contact with the edge portion of the spiral groove. Therefore, the fluid compressor of the present invention operates stably over a long period of time.

[0019]

EXAMPLES Examples of the present invention will be described below. Example 1 (1) Molding of core material

(A) PAN-based carbon fiber cloth (Toho Leh
Yon's product name W1103) and 125 μm thick tetra
Fluoroethylene-perfluoroalkyl vinyl ether
Film of copolymer (hereinafter abbreviated as PFA)
・ S.E., product name Toyofuron 125PX)
Laminated, temperature 325 ℃, pressure 30-35kg / cm² so
Compression molding at the time of heat, impregnating carbon fiber with PFA
As the core material. The PFA film used here
Softening point of 300-310 ℃, Young's modulus of the obtained core material
Is 800 N / m² Met. (B) Prepare a thin plate of SUS304 and cut it into a square bar
And made the core material. Young's modulus of this core material is 1200 N / m
² Met. (2) Forming of intermediate material

A predetermined number of 125 μm-thick PFA films were laminated and formed into a 1.2 mm square block by hot compression molding. A post-processed rod-shaped body having a predetermined size was produced as an intermediate material. (3) Forming surface material

A PAN type carbon fiber sleeve (manufactured by Toho Rayon Co., Ltd.) and a PFA film having a thickness of 125 μm are laminated,
Temperature 330 ° C, pressure 30-35 kg / cm ² Then, it was compression-molded when hot to obtain a surface layer material.

The above members are laminated and the temperature is 330 ° C. and the pressure is 30 to 35 kg / cm ^2. Then, a sliding member was obtained by hot compression molding into a 3 mm square rod. The core material is 0.2 mm
Corner and intermediate material thickness is 1.1mm, surface layer material thickness is 0.3
It was mm. This was cut into a predetermined size to prepare a test piece.

With respect to these test pieces, a load of 3.0 kg
/ Cm ² , Speed of 0.6 m / sec, temperature of 100 ° C., using 3GSD as the lubricating oil, and SK3 as the mating material
Edge pin abrasion test (open angle 120 °, tip 2
00 μmR), no abnormality was observed for 5 hours or more with any of the core materials a and b.

Further, the test piece was used as a blade by being pushed along the spiral groove portion of the piston of the helical blade type fluid compressor shown in FIG. Rotor speed 3
When the drive test was performed under the condition of 000 rpm, it was 500
No abnormal wear was observed even after 0 hours of operation. Example 2

Para-aramid fiber cloth (Dupont Toray Kevlar, trade name T-740) was used as a reinforcing fiber for the core material and the surface material, and a sliding member was prepared in exactly the same manner as in Example 1. A drive test was performed by using the blade as a blade of a helical blade type fluid compressor. As a result, no abnormal wear was observed even after running for 5000 hours. Example 3

Aramid fiber cloth T-740 as core material
At a temperature of 350 ° C and a pressure of 50 kg / cm ² In the same manner as in Example 1, using a material impregnated with polyetheretherketone having a softening point of 285 ° C. under the conditions of, a PFA block as an intermediate material, and an aramid fiber cloth T-740 impregnated with PFA as a surface material To produce a sliding member and use it as a blade of a helical blade type fluid compressor,
A drive test was conducted. As a result, no abnormal wear was observed even after running for 5000 hours. Comparative Example 1

The flexural modulus of a sample obtained by cutting a polyimide resin containing 15 wt% of graphite into a predetermined size was measured and found to be 4000 N / m ^2. Met. When I tried to push this into the groove of the piston of the helical blade type fluid compressor, it could not be pushed in because of poor moldability. Comparative example 2

The ultrahigh molecular weight polyethylene block was cut into a predetermined size, pushed into the groove portion of the piston of a helical blade type fluid compressor, and used as a blade to conduct a drive test. As a result, the sealing property was lost in a short time, and the fluid compression efficiency was significantly reduced. It is considered that this is due to the thermal deterioration of the blade. Comparative Example 3

Aramid fiber cloth T-74 as a surface layer material
0 at a temperature of 350 ° C and a pressure of 50 kg / cm ² A sliding member was produced in exactly the same manner as in Example 3 except that the one impregnated with polyether ether ketone was used under the conditions of. When I tried to push this into the groove of the piston of the helical blade type fluid compressor, it could not be pushed in because of poor moldability.

[0031]

As described in detail above, since the blade according to the present invention has a three-layer structure of a core material, an intermediate material and a surface layer material, it has not only heat resistance and wear resistance but also twisting.
It is also resistant to bending, and the fluid compressor using it can maintain the compression capacity for a long time.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of blades constituting a helical blade type fluid compressor according to the present invention.

FIG. 2 is a sectional view of a helical blade type fluid compressor according to the present invention.

[Explanation of symbols]

1 ... Core material, 2 ... Intermediate material, 3 ... Surface layer material, 101 ... Stator, 103 ... Rotor, 105 ... Driving means, 107 ... Cylinder, 109 ... Oldham ring, 111 ... Piston, 1
13 ... Groove, 115 ... Blade, 117 ... Working chamber, 119
… Suction side, 120… Discharge side.

Claims (1)

[Claims] 1. A cylinder having a suction side and a discharge side,
A cylindrical piston that is inserted in this cylinder in an eccentric state so that its outer peripheral surface is in contact with the inner peripheral surface of the cylinder and that makes relative movement with respect to the cylinder; and a piston that is provided on the outer peripheral surface of this piston An inner peripheral surface of the cylinder, which has a spiral groove formed with a pitch gradually decreasing toward the side, and an outer peripheral surface which is fitted in the groove and is in contact with the inner peripheral surface of the cylinder. In a fluid compressor including a spiral blade that partitions the outer peripheral surface of the piston into a plurality of working chambers, the blade is a core material,
It has a structure consisting of an intermediate material and a surface layer material, and the core material is 0.8
~ 1.5 x 10 ⁵ N / m ² Of a fiber having a Young's modulus of a metal or a thermoplastic resin having a softening point of 200 ° C. or higher, the intermediate material of a fluororesin having a softening point of 280 ° C. or higher, and the surface layer material of a softening point of 280 ° C. or higher. A fluid compressor comprising a fiber-reinforced body of a fluorine-based resin having dots.