JPS606091A - Vane type rotary compressor - Google Patents

Abstract

PURPOSE:To aim at preventing burning damage and abrasion of a vane type compressor, by fabricating a cam ring, a rotor, etc. with ceramic materials. CONSTITUTION:A vane type compressor comprises a front side plate 1, a rear side plate 2 and a cam ring clamped therebetween. Further, a rotor 5 made of ceramic materials is rotatably disposed in the cam ring. The cam ring 3 may be made of ceramic materials, or of cast aluminum materials with zirconium oxide as a ceramic material being flamecoated to the inner surface of the cam ring.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a vane-type rotary compressor used in automobile air conditioners and the like.

[Background of the invention□]

Conventionally, the cam ring of a vane-type rotary compressor has been made of cast iron for its workability, and the rotor has been made of steel for its strength. However, due to the movement between the rotor/tip and the inner circumferential surface of the cam ring in the high-speed rotation range, the inner circumferential surface of the cam ring wears out, and the minimum clearance between the rotor and the cam ring (hereinafter referred to as the tangential seal gap) becomes narrower. As a result, there was a drawback that the performance deteriorated. 1, high-speed IL due to the difference in thermal expansion coefficient between the rotor and cam ring! The tangential seal gap was made large in order to prevent rotor burnout in the first rotation area. For this reason, there was a drawback that the efficiency was low in the low speed rotation range where the operating temperature was low.

[Purpose of the invention]

The purpose of the present invention is to prevent burnout in the high speed rotation region of the compressor,
The purpose of the present invention is to provide a complete vane type rotary compressor that improves durability by preventing wear on the inner circumferential surface of the cam ring and improves performance in the low-speed rotation range.

[Summary of the invention]

The compressor of the present invention has a cam ring made entirely of ceramics, or both a cam ring and a rotor made of ceramics.

Another 9 compressor of the present invention is one in which ceramics are sprayed on the inner circumferential surface of a cam ring made of a metal-iron-based material or an aluminum-based material.

[Embodiments of the invention]

Embodiments of the present invention will be described below using FIG. IH1.

FIG. 1 shows a vane type one-notary press i@ equipped with a cam ring and rotor made of ceramics. In the vane type rotary compressor, a space is formed by a front gray) 1, a rear plate 2, and a cam ring 3 fastened therebetween, and in this space, a space is provided on the rear and front gray 1°2. A rotor 5 made of ceramic is rotatably disposed by a bearing 4. This rotor 5 is provided with a plurality of radial grooves 6 on its outer circumference. A sliding vane 7 is installed in this groove 6, and the drive shaft 8 is driven by a belt by an engine or the like via an electromagnetic clutch (not shown). 11 plate], the rear plate 2 and the cam ring 3 made of ceramic are bolts (not shown).
is fixed to the front cover 10 by a chamber 11, and further surrounded by a chamber 11. The front cover 10 and the chamber 11 are kept airtight by an 01J ring 12, and a rotor 13 connected to a drive shaft 8
and a cover grate 14 fixed to the front cover 10.
and Itinl + seal are formed.

In such a vane compressor, the refrigerant iJ returned from the refrigeration cycle to the compressor, '7. , y I: I seat cover 10 with form 1) ~, ゛ 7 refrigerant suction
Therefore, the low pressure formed in the front cover 10 flows into the low pressure 16.

The same refrigerant is applied to the front 'If!' as many times as there are compression chambers 17 formed by the cam ring 3 and the rotor 5. The through holes 18 (two in this example) provided in the l plate 1, the through holes 19 (two in this example) provided in the cam ring 3, and the suction boat 20 that communicates between the through holes 19 and the compression chamber 17. Through compression chamber 17
flows into. The refrigerant is compressed between the vanes 7 incorporated in the rotor 5, and is discharged through the discharge boat 21 and discharge valve 22 provided in the cam ring 3 to the discharge royal chamber in the chamber 11, where the refrigerant is discharged into the discharge royal chamber in the chamber 11. The oil is completely separated by the oil separator and flows out into the refrigeration cycle through the refrigerant discharge port 23 provided in the chamber 11. The sliding parts such as bearings are lubricated by sucking oil from the oil reservoir 24 through the oil reservoir 257 using a differential pressure.

Figures 2 and 3 show the relationship between temperature (rotational speed) and tangential seal gap. The temperature increases almost in proportion to the rotation speed. Figure 2 shows the cam ring material being cast aluminum.
Ceramic (zirconium oxide) is completely sprayed on the inner surface.
It is something. Since the conventional rotor shown by the solid line (1) uses steel, it has a larger coefficient of thermal expansion than the conventional cam ring (material: cast iron) shown by the solid line (2). In order to prevent the tangential seal gap from becoming O at the highest temperature (maximum rotational speed), the tangential seal gap must be made large at low temperatures (idling rotational speed), as in the case of the broken line (3). As shown, conventional cam ring material (cast iron: coefficient of thermal expansion 9~10
Aluminum castings with a larger coefficient of thermal expansion than 10-6/lZ') (coefficient of thermal expansion 15-18X10=/'?:)i
Because of this, the tangential seal gap does not become 0 at maximum rotation even with a small tangential seal gear lug like b. With conventional cam rings and rotors, if there is an abnormally high outside temperature or abnormal suction overheating, the tangential seal gap may become zero and the compressor may burn out.

Next, in Figure 3, the coefficient of thermal expansion is shown by the dashed-dotted line (3).

As shown in (4), this is an example in which the cam ring and rotor are made of silicon nitride (thermal expansion coefficient of 5 to 6 X, 10-6/lr). In this case, the initially provided tangential seal gap b hardly changes even at high temperatures (high speeds).

Figures 4 and 5 show the relationship between operating time and tangential seal gap. As described above, the wear of the inner circumferential surface of the ring increases with the passage of operating time, and the tangential seal gap increases accordingly. FIG. 4 shows the increase in tangential seal gear wear in the high speed rotation range. Real an
Conventional product fd shown in (1): Idf wear increases with time, but does the product of the present invention shown in (2) have a one-point complication? T
The change in the tangential seal gap is small even after long hours of operation. FIG. 5 similarly shows the relationship between the tangential seal gap and the operating time in the low speed N rotation range.

FIG. 6 shows the relationship between the tangential sole gap and the volumetric efficiency after long-term operation. As the tangential sole gap increases, the volumetric efficiency decreases along the +Pi line. After a conventional product has been operated for a long time, a very large tangential seal gap is created as shown in FIGS. 4 and 5, so the volumetric efficiency is very poor in both high speed and low speed N rotation regions.

On the other hand, since the product of the present invention has a small tangential seal gap even after long-term operation, there is very little decrease in volumetric efficiency. Particularly high volumetric efficiency can be maintained in the low-speed rotation region.

According to the present invention, the volumetric efficiency in the low-speed rotation region can be maintained from the initial stage to the end of long-term operation, making it possible to reduce the size and weight of the compressor. However, there is no possibility of burnout, there is less wear and tear, and the durability is significantly improved.

In this example, 76 examples are shown in which the cam ring phase material rotor 11 is made of silicon nitride, and an example in which the cam ring material is aluminum and zirconium oxide is sprayed on the inner circumference, but other ceramics may also be used to improve strength, sliding properties, Similar results can be obtained with alumina, vertically oriented silicon, etc., which minimize the difference in thermal expansion coefficient between the rotor and cam ring materials.

〔Effect of the invention〕

As described above (1), according to the present invention, burnout prevention IE in the high speed rotation region of the compressor and wear μJ of the inner circumferential surface of the cam ring are achieved.
・It is possible to simultaneously achieve higher performance (VbJ) in the high speed rotation range (IJ).

Figure 1 is a vertical sectional view showing the structure of a vane type rotary compressor that is completely equipped with a cam ring and a rotor made of a ceramic material according to the present invention, and Figures 2 and 3 are temperature diagrams. The relationship between the operating time and the tangential seal gap, Figures 4 and 5, and the relationship between the operating time and the tangential seal gap, Figure 6. 8 Terama 1S Otsu ``NA fφshinkin --IL Kiya, 7 no.

Claims (1)

[Scope of Claims] 1. A vane type rotary compressor for air conditioning comprising a rotor and a cam ring, characterized in that the cam ring is made of gold ceramic. 2. A vane type rotary compressor according to claim 1, wherein the rotor is made of ceramic. 3. A vane type rotary compressor for air conditioning that is composed of a rotor and a cam ring, the cam ring being made of iron-based or At-based material, and the inner peripheral surface of the cam ring being coated with ceramic. . 4. A vane type rotary compressor according to claim 3, wherein the rotor is made of ceramic.