JPH0716065Y2 - Sealing structure of compression chamber in vane compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a seal structure of a compression chamber in a vane compressor in which a space between a cylinder and a rotor is divided by a plurality of vanes to form a compression chamber. It is a thing.

[Prior Art] Since leakage of a refrigerant gas from a compression chamber defined by a vane in a cylinder leads to a reduction in compression efficiency, for example, as disclosed in Japanese Utility Model Laid-Open No. 63-154785, leakage is likely to occur. A seal ring is interposed between the rotor end surface and the front side plate. There is a slight clearance between the rotor end surface and the front side plate, and the high pressure refrigerant gas in the compression chamber easily leaks to the suction chamber side in the low pressure region via this clearance. The seal ring is housed in an annular recess on the front side plate, and is pressed against the rotating rotor end surface by the action of the discharge pressure passing through a slight clearance between the front side plate and the rotor end surface. To be done.

Aluminum is used as the material of the rotor and the front side plate in order to reduce the weight of the compressor.

At the sliding contact portion between the seal ring and the rotor end face, a mist-like lubricating oil in the refrigerant gas or an annular groove provided further outside the seal ring as disclosed in Japanese Utility Model Laid-Open No. 63-154785 is installed in the compressor. Is lubricated by the lubricating oil introduced from the oil pool portion, and wear of the sliding contact portion between the seal ring and the rotor end surface is prevented.

[Problems to be Solved by the Invention] However, when the oil film at the sliding contact portion between the rotor end surface and the seal ring is broken due to the rotation of the rotor, early wear of the sliding contact portion between the seal ring and the rotor end surface occurs. Inevitable.

It is an object of the present invention to provide a seal structure capable of maintaining a good sealing property of a compression chamber for a long period of time by improving the wear resistance performance of a sliding contact portion which leads to deterioration of the sealing property.

[Means for Solving the Problems] Therefore, in the present invention, a vane compressor in which the rotor and the front side plate are made of aluminum is targeted, and the sliding contact portion of the rotor with respect to the seal ring is formed of tetrafluoroethylene resin containing polyimide. In addition, the sliding contact portion of the seal ring with respect to the rotor was formed of carbon-containing tetrafluoroethylene resin.

[Operation] The lubricating oil that has entered between the seal ring and the rotor end surface prevents direct contact between the two and prevents wear of the sliding contact portion of the seal ring. The carbon contained in the sliding contact portion of the seal ring is very excellent in adsorbing the lubricating oil, and the lubricating oil that has entered between the seal ring and the rotor end surface is easily adsorbed by the carbon in the seal ring. Therefore, the lubricating oil adsorbed by the carbon in the seal ring forms an oil film, and the oil adsorption is prevented from causing the oil film to run out. As a result, the rate of progress of wear of the sliding contact portion is significantly reduced, and the seal of the compression chamber is stably maintained for a long period of time.

[Embodiment] An embodiment in which the present invention is embodied in a fixed capacity vane compressor will be described below with reference to FIGS.

Aluminum side plates 4 and 5 are closely attached to both front and rear ends of an aluminum cylinder 3 housed and fixed in a pair of front and rear housings 1 and 2, and a substantially elliptic cylindrical chamber inside the cylinder 3 has a circular shape. A columnar aluminum rotor 6 is rotatably supported. Aluminum is used as the material of the cylinder 3, the side plates 4 and 5, and the rotor 6 for the purpose of reducing the weight of the compressor, and for avoiding the adhesion due to the sliding contact of aluminum as shown in FIG. In addition, a protective layer C ₁ made of a mixed material of tetrafluoroethylene resin having excellent sliding performance, polyimide having excellent hardness, and carbon is provided on the end surface and the peripheral surface of the rotor 6. A plurality of grooves 7 are formed in the radial direction on the peripheral surface of the rotor 6,
A vane 8 is fitted into and supported by each groove 7 in close contact with the front and rear side plates 4 and 5 so as to be slidable in a substantially radial direction.

An oil separation chamber R is formed between the rear housing 2 and the rear side plate 5, and an oil pool portion Rp is provided below the oil separation chamber R. The bottom of the groove 7 communicates with the oil pool portion Rp via the annular groove 5a and the passage 5b on the inner surface of the rear side plate 5, so that the oil of the oil pulley portion Rp can be supplied to the bottom of the groove 7. There is. As a result, each vane 8 can be brought into contact with the circumferential surface of the cylinder chamber by the centrifugal force associated with the rotation of the rotor 6 and the hydraulic pressure at the bottom of the groove 7.
It is divided into R ₁ and R ₂ .

As shown in FIG. 4, the cylinder 3 has a pair of suction passages 9 and 10.
Are axially pierced at the axisymmetric position, and a pair of discharge chambers 3a, 3b are formed between the rear housing 2 and the cylinder 3 at the axisymmetric position. The suction passages 9 and 10 are suction ports 11 and 1.
The discharge chambers 3a and 3b are communicated with the cylinder chamber via the discharge ports 13 and 14. The discharge ports 13 and 14 are openably closed by discharge valves 15 and 16, and both discharge chambers 3a and 3b are connected to an oil separation chamber R through a through hole 5c penetrating the rear side plate 5. .

An annular groove 4a is provided on the surface of the front side plate 4 facing the end surface of the rotor 6 so as to communicate with the bottom of the groove 7 in the rotor 6, and a lubricating oil equivalent to the discharge pressure is stored in the annular groove 4a. I'm supposed to get stuck. Annular groove 4a and support shaft 6a
An annular accommodation groove 4b is provided on the facing surface of the front side plate 4 between the front side plate 4 and the front side plate 4, and a cut hole is formed in the accommodation groove 4b.
A seal ring 22 having 22a is housed. The seal ring 22 is made of a mixed material of tetrafluoroethylene resin and carbon, and the weight ratio of carbon is set to about 30%.

As shown in FIG. 3, a slight clearance ρ between the front side plate 4 and the end surface of the rotor 6 and an attempt to leak to the suction chamber 1a in the low pressure region via the front side plate 4 and the support shaft 6a. . Further, the lubricating oil in the storage groove 4b goes from the compression chambers R ₁ and R ₂ side in the high pressure region to the suction chamber 1a side in the low pressure region. If the seal ring 22 and the end face of the rotor 6 are not sufficiently sealed, not only the high pressure refrigerant gas in the compression chambers R ₁ and R ₂ but also the lubricating oil in the accommodating groove 4b is unnecessarily sucked into the suction chamber. 1a
To flow out. Seal ring 22 has clearance ρ
The high pressure refrigerant gas is pressed against the end surface of the rotor 6 by the pressure action of the high pressure refrigerant gas, and the presence of the notch 22a causes the inner circumference of the seal ring 22 to be closely joined to the inner peripheral wall of the housing groove 4b. Is reliably prevented.

Since the seal ring 22 for preventing such leakage is pressed against the end face of the rotating rotor 6, even though the sliding contact portion between the two is formed of tetrafluoroethylene resin having excellent sliding performance, this sliding contact is prevented. Early wear of parts is inevitable. However, the lubricating oil that has entered between the sliding contact portions is adsorbed by the carbon mixed in a relatively large amount in the seal ring 22, and this adsorbed lubricating oil forms an oil film. Since the lubricating oil adsorption performance of carbon is very high, the seal ring 22
The film of the lubricating oil adsorbed on the sliding contact portion of is hardly broken. Therefore, the front side plate 4 and the rotor 6
There is no direct sliding contact with the end faces, and early wear of the seal ring 22 and the protective layer C ₁ is reliably prevented. As a result, the effect of preventing high-pressure refrigerant gas from leaking between the front side plate 4 and the end surface of the rotor 6 and the effect of preventing lubricating oil from leaking are improved. Oil waste is eliminated.

Of course, the present invention is not limited to the above embodiment, and for example, as shown in FIG. 5, a protective layer made of a mixture of tetrafluoroethylene resin and carbon is formed on the surface of the seal ring 23.
An example in which C ₂ is provided is also possible, and this configuration can also obtain the same effects as the above example.

Further, the present invention is applied to a vane compressor having a variable capacity function, by appropriately changing the mixing ratio of tetrafluoroethylene resin and carbon on the seal ring side, omitting carbon in the rotor side protective layer. It is also possible.

[Advantage of the Invention] As described in detail above, according to the present invention, since the sliding contact portion of the seal ring with respect to the rotor is formed of carbon-containing tetrafluoroethylene resin, the lubricating oil is adsorbed and held by the carbon mixed in the seal ring. At the same time, it is possible to prevent direct contact between the rotor and the front side plate without breaking the film of the lubricant oil that is adsorbed and held, and thereby to achieve an excellent effect that early wear of the sliding contact portion between the two can be eliminated.

[Brief description of drawings]

1 to 4 show an embodiment embodying the present invention.
Fig. 2 is an enlarged sectional view taken along the line AA in Fig. 2, Fig. 2 is a sectional side view, Fig. 3 is an enlarged sectional view of an essential part, Fig. 4 is a sectional view taken along line BB in Fig. 2, and Fig. 5 is another example. It is a principal part expanded sectional view shown. Front side plate 4, storage groove 4b, rotor 6, seal rings 22, 23, protective layer C ₂ .

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location F04C 29/00 U

Claims (1)

[Scope of utility model registration request] 1. A space between a peripheral surface of a rotor rotatably housed in a cylinder sandwiched between a front side plate and a rear side plate and an inner peripheral surface of the cylinder is divided into a plurality of compression chambers by a plurality of vanes. In the vane compressor that is formed and sucks, compresses, and discharges the refrigerant gas by rotating the rotor, the rotor and the front side plate are made of aluminum, and the end surface of the rotor and the front side plate are in sliding contact with the rotor. With a seal ring interposed, the sliding contact portion of the rotor with respect to the seal ring is formed of tetrafluoroethylene resin containing polyimide,
A seal structure of a compression chamber in a vane compressor in which a sliding portion of a seal ring with respect to a rotor is formed of carbon-containing tetrafluoroethylene resin.