JPH10196543A - Valve plate for compressor, compressor using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the heat resistance and the fatigue strength, by making a valve plate out of a resin composition comprising a substance selected from a polyimide resin, polyetherether ketone and polyether ketone having a specific glass transition point, polyether imide, and a carbon fiber. SOLUTION: A valve plate 23 mounted on an inlet valve 2 of a compressor, usually covers an opening of an air passage of a valve sheet, to close the same. On this occasion, the valve sheet is prepared by molding a resin composition comprising 100 pt.wt of polyimide resin of more than 230 deg.C of a glass transition point, 50-70 pt.wt. of a substance selected from polyetherether ketone and polyether ketone, 0-20 pt.wt of polyether imide, and 40-80 pt.wt of carbon fiber. The condition for the injection molding is not particularly specified, but 410-430 deg.C of cylinder temperature, 180-210 deg.C of metal mold temperature, 2300-3500kgf/cm<2> of charging pressure, 1-3 seconds of charging time, and 45-90 seconds of cycle time are desired.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve plate for a compressor, and more particularly to a valve plate formed by molding a resin composition and a reciprocating compressor using the valve plate.

[0002]

2. Description of the Related Art A reciprocating compressor in which a piston reciprocates in a cylinder is provided with a suction valve and a discharge valve. These valves are provided with a valve seat having a group of air holes arranged in an annular shape, and an annular shape which is usually in close contact with the periphery of the group of air holes in the valve seat, for example, by being urged by an elastic body. It has a valve plate.

This valve plate is supported so that it can be separated from the valve seat when the pressure in the space on the valve plate side of the valve seat becomes lower than the pressure on the opposite side. The air holes are tightly closed and the air holes are closed to prevent gas from flowing from the valve plate side of the air holes to the opposite side. The valve plate is required to be made of a material that does not deteriorate due to repeated stress and has excellent heat resistance that can withstand the high temperature of the gas in the cylinder due to adiabatic compression.

Conventionally, metals such as iron and aluminum have often been used as a material for the valve plate.
When the valve plate is made of such a metal, the valve plate itself becomes heavy, causing a slow response operation when opening and closing the valve, and also has a problem that noise is large. Also,
There has been a problem that wear and cracks occur during use, and the dropped pieces fall into the cylinder, damaging the piston and the cylinder and causing a failure.

The above problem can be solved by forming the valve plate from a heat-resistant resin, and such a valve plate actually exists. However, in the conventional resin used for the valve plate, the valve plate cannot be used. The glass transition temperature is too low,
If the temperature exceeds 50 ° C., deformation occurs, and there is also a problem in fatigue strength against repeated stress. Also, if a reinforcing material such as glass fiber is mixed with the above-mentioned heat-resistant resin, the heat resistance can be slightly improved, but a valve plate using a heat-resistant resin that can withstand a severe use environment is used. I couldn't get it.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a valve made of a resin composition having excellent heat resistance and high fatigue strength against repeated stress. An object of the present invention is to provide a plate and a compressor using the valve plate.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a valve plate having at least one member selected from the group consisting of 100 parts by weight of a polyimide resin having a glass transition temperature of more than 230 ° C., and polyether ether ketone and polyether ketone. This is achieved by a resin composition comprising 50 to 70 parts by weight of the substance, 0 to 20 parts by weight of polyetherimide, and 40 to 80 parts by weight of carbon fiber.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A resin composition for a valve plate of a suction valve and a discharge valve used in a compressor according to the present invention comprises 100 parts by weight of a polyimide resin having a glass transition temperature exceeding 230 ° C., polyether ether ketone and It comprises 20 to 60 parts by weight of at least one substance selected from the group consisting of polyetherketone and 20 to 60 parts by weight of carbon fiber.

As a polyimide resin having a glass transition temperature of more than 230 ° C., for example, a polyimide resin (trade name: Aurum) manufactured by Mitsui Toatsu Chemicals Co., Ltd. can be mentioned. It is not limited to. Polyetheretherketone and polyetherketone are added to improve the fatigue strength of the valve plate, and either one of them may be used alone, or both may be used together. Polyetherimide is compounded to improve the compatibility between the polyimide resin and the resin added thereto. The carbon fiber is added to improve the compressive strength of the valve plate, and it is recommended to use a carbon fiber having a length of about 100 to 300 μm and a diameter of about 5 to 15 μm.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory longitudinal sectional view showing an embodiment of a compressor according to the present invention, FIG. 2 is a partially enlarged sectional view showing an intake valve shown in FIG. 1, and FIG. 3 is a main configuration around a valve plate shown in FIG. FIG. 4 is a three-dimensional exploded view of the main structure shown in FIG. 3, and FIGS. 5 to 9 are sectional views showing second to sixth embodiments of the valve plate, respectively.

First, FIG. 1 will be described. In the drawing, 1 is a compressor according to the present invention, 10 is a cylinder, 11 is a piston, 12 is a suction port, 13 is a discharge port, 2 and 3 are suction valves, and 4 and 5 are discharge valves. The cylinder 10 has a vertically long, substantially cylindrical shape, and has a piston 1 which is in close contact with the inner peripheral surface thereof without any gap, and which can reciprocate along an axis of symmetry.
One. The piston 11 is connected to a piston rod 110 that is reciprocated along a symmetry axis of the cylinder 10 by a motor (not shown).

The piston rod 110 penetrates the bottom of the cylinder 10 and is connected to the piston 11. The gap between the piston rod 110 and the cylinder 10 is hermetically sealed by a seal member 100. The intake valves 2 and 3 are cylinder 1
0 at least one at each end.
Are connected to the suction valves 2 and 3. At least one discharge valve 4, 5 is provided at each end of the cylinder 10, and the discharge port 13 communicates with the discharge valves 4, 5.

Next, the suction valves 2 and 3 will be described with reference to FIGS. 2 to 4. Since the suction valves 2 and 3 have the same configuration, the suction valve 2 will be described here. The suction valve 2 includes a valve seat 20, a valve plate 21,
2, 23, valve springs 24, 25, 26, and a valve guide 27. As shown in FIGS. 3 and 4, the valve seat 20 includes a disk portion 20a disposed at the center, a first outer ring portion 20b sequentially disposed with a predetermined gap around the disk portion 20a, and a first outer ring portion 20b. Outer ring 20
b outer ring portion 20c disposed on the outer periphery of b with a predetermined gap
And a third outer ring portion 20d and a number of ribs 20e connecting the above members.

The gaps provided between the disk 20a and the first outer ring 20b, the first outer ring 20b and the second outer ring 20c, and the gaps provided between the second outer ring 20c and the third outer ring 20d. Is
It becomes the ventilation path 20f. The cross section of the ventilation path 20f narrows toward the opening on the side where the valve plates 21 to 23 are provided. Valve plates 21 to 23
Are flat annular members having different diameters,
It can cover and close the opening of the ventilation path 20f of the valve seat 20, and is formed by injection molding using the above-described resin composition.

The molding conditions for this injection molding are as follows: cylinder temperature 410-430 ° C., mold temperature 180-210 ° C., filling pressure 2300-3500 kgf / cm ² , filling time 1
Preferably, the cycle time is 3 seconds and the cycle time is 45 to 90 seconds. The valve springs 24 to 26 are annular in shape that undulate rotationally symmetrically.
It has the same diameter as 3. Although the valve springs 24 to 26 are shown in a flat plate shape in FIG. 4, it is assumed that the valve springs are processed in a wave shape as shown in FIG.

The valve guide 27 is a disk-shaped member whose diameter is substantially equal to the outer diameter of the valve plate 23 having the maximum diameter. The air hole 27a has a plurality of arc-shaped air passages 27b provided therearound in a rotationally symmetric manner. When the valve guide 27 is integrated with the valve seat 20 as described later, the arc-shaped ventilation path 27b is formed between the first outer ring portion 20b and the second outer ring portion 20c of the valve seat 20.
Are provided along the region facing the. A plurality of portions of the valve guide 27 facing the first and second outer ring portions 20b, 20c of the valve seat 20, that is, between the arcuate ventilation passages 27b, 27b adjacent on the same circle, leg portions 27c are respectively provided. Is provided.

When the valve guide 27 is fitted to the valve seat 20, the leg 27c abuts against the first and second outer ring portions 20b and 20c, and the valve guide 27
Is to maintain a predetermined gap with the valve seat 20 and to hold the valve seats 21 to 23 and the valve springs 24 to 26 so as not to deviate from predetermined positions. Although not shown, the valve guide 27 is integrated with the valve seat 20 by a bolt that penetrates the leg portion 27c and reaches the first outer ring portion 20b of the valve seat 20.

When assembling the above members, as shown in FIG. 3 and FIG.
f, the valve plates 21 to 23 are disposed on the valve plates 20 to 23, and the valve springs 24 to
26 and the valve guide 27 with the valve seat 2
0. At this time, the valve springs 24 to 26 are crushed between the valve plates 21 to 23 and the valve guide 27, and the valve plates 21 to 23 are pressed against the periphery of the ventilation path 20f of the valve seat 20 at a required pressure, and 20f is closed.

Then, as shown in FIG. 2, the valve guide 27 is assembled so as to be exposed in the cylinder 10 to constitute the suction valve 2, and the suction valve 2 and the suction valve 3 having the same structure are shown in FIG. Attach it to the compressor 1 as shown in FIG. Further, as the discharge valves 4 and 5,
The valve seat, the valve plate, the valve spring, and the valve guide were arranged in the opposite order, and the valve seat was exposed in the cylinder 10. This was attached to the compressor 1 as shown in FIG.

In the compressor 1 shown in FIG. 1, a prime mover (not shown) operates to operate the piston rod 11.
When 0 is lowered, the piston 11 descends. This movement of the piston 11 lowers the air pressure in the space on the side of the suction valve 2 and the discharge valve 4 in the cylinder 10, so that the suction valve 2
The valve plates 21 to 23 are lifted from the valve seat 20, and gas is sucked into the cylinder 10 from the suction port 12.

Conversely, when the piston rod 110 is pushed up and the piston 11 rises, the air pressure in the space on the suction valve 2 and discharge valve 4 side rises, so that the suction valve 2 is closed and the valve plate of the discharge valve 4 is closed. The gas rises from the sheet, and the gas in the cylinder 10 is discharged out of the cylinder 10 and sent to the discharge port 13. The suction valve 3 and the discharge valve 5 also perform the same intake and exhaust as described above in accordance with the change in the atmospheric pressure in the cylinder 10. In the compressor 1, the intake and exhaust are performed as the piston 11 moves. Are performed simultaneously.

Next, second to sixth embodiments of the valve plate shown in FIGS. 5 to 9 will be described. Although the valve plates 280 to 282 shown in FIGS. 5 to 7 have a rectangular cross section, the corners are chamfered, and the valve plates 283 and 28 shown in FIGS.
No. 4 is directly molded into a required shape using a mold for producing a molded product having a triangular or semicircular cross section. These valve plates 280 to 284 are appropriately selected and adopted according to the shape of the opening of the ventilation passage of the valve seat. For example, in the case of the valve seat 29 having a shape as shown in FIG. , A required valve plate 280 is selected to improve the airtightness of the valve.

The present invention is not limited to the above embodiments. For example, a valve plate is formed by molding the above resin composition into a disk having a diameter of about 100 to 180 mm and a thickness of about 3 to 10 mm. Machining may be performed to cut out to a required shape, or the resin composition may be formed into a rectangular plate material, and then cut out to a required shape therefrom. The shape can be complicated as long as the mold can be formed. Further, a concave portion for receiving the leg portion of the valve guide may be provided in the valve seat, and the type of the compressor and the valve, the shape of the valve plate, etc. The design can be freely changed within the scope, and the present invention covers all the modified embodiments easily conceivable by those skilled in the art from the above description.

[0024]

Since the compressor according to the present invention is constructed as described above, according to the present invention, the valve plate has excellent heat resistance, high fatigue strength against repetitive stress, and a valve even under a severe use environment. The plate is deformed,
No damage.

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional view showing an embodiment of a compressor according to the present invention.

FIG. 2 is a partially enlarged cross-sectional view showing the suction valve shown in FIG.

FIG. 3 is an enlarged sectional view showing a main configuration around a valve plate shown in FIG. 2;

FIG. 4 is a three-dimensional exploded view of the main configuration shown in FIG. 3;

FIG. 5 is a sectional view showing a second embodiment of the valve plate.

FIG. 6 is a sectional view showing a third embodiment of the valve plate.

FIG. 7 is a sectional view showing a fourth embodiment of the valve plate.

FIG. 8 is a sectional view showing a fifth embodiment of the valve plate.

FIG. 9 is a sectional view showing a sixth embodiment of the valve plate.

[Explanation of symbols]

 1 ... Compressor 10 ... Cylinder 100 ... Seal member 11 ... Piston 110 ... Movement control shaft 12 ... Suction port 13 ... Discharge port 2 ... ··· Suction valve 20 ···· Valve seat 20a ··· Disc part 20b ···· First outer ring part 20c ··· Second outer ring part 20d ···· Third outer ring part 20e ··· Rib 20f ... Ventilation passage 21 ... Valve plate 22 ... Valve plate 23 ... Valve plate 24 ... Valve spring 25 ... Valve spring 26 ... Valve spring 27 ... ..Valve guide 27a ... circular ventilation path 27b ... arc-shaped ventilation path 27c ... leg 280 ... valve plate 281 ... valve plate 282 ... valve plate 283 ... valve Valve plate 284 ... Valve plate 29 ... Valve seat 3 ... Suction valve 4 ... Discharge valve 5 ... Discharge valve

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Fumio Oshino 2-1-1 Tango-dori, Minami-ku, Nagoya City, Aichi Prefecture Inside Mitsui Toatsu Chemicals Co., Ltd.

Claims (2)

[Claims] 1. 100 parts by weight of a polyimide resin having a glass transition temperature exceeding 230 ° C., 50 to 70 parts by weight of at least one substance selected from the group consisting of polyetheretherketone and polyetherketone, and polyetherimide 0 Compressor valve plate (21, 22, 23, 280, 281, 28) formed by molding a resin composition comprising 20 parts by weight and 40-80 parts by weight of carbon fiber.
2, 283, 284). 2. A cylinder (10), a piston (11) reciprocating in the cylinder (10), and at least one suction valve (2, 3) and a discharge valve (4, 4) provided in the cylinder (10). 5), wherein the suction valve (2, 3) and the discharge valve (4, 5) are provided with the valve plate (21, 22, 23, 280, 2) according to claim 1.
81, 282, 283, 284).