JPS59160091A - Rotary compressor - Google Patents

Abstract

PURPOSE:To permit to prevent seizing of contacting surfaces by a method wherein a multitude of recesses for lubricating oil reservoirs are provided on the slidingly contacting places of a side plate and a rotor. CONSTITUTION:A ball indent 10 is provided with a configuration capable of keeping the lubricating oil 12 substantially by the surface tension of the oil. The ball indents 10 are formed on the predetermined surface at many spots, therefore, the seizing of the slidingly contacting surfaces of the rotar 2 and the side plates 5 may be prevented effectively under a condition that the supply of the lubricating oil is poor or the oil is not supplied like the time of starting of the rotary compressor.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical field The present invention relates to a rotary compressor, and more specifically, it relates to an improved side plate and rotor of a rotary compressor for a car air conditioner.
r-related. Rotary compressors for car air conditioners are smaller and lighter than conventional piston-type compressors, and have high cooling efficiency in high rotational speed ranges. Although it is attracting a lot of attention, it is a technical field in which there are many points that need improvement because the accumulation of technology is insufficient.

(2) Description of the Prior Art Rotary compressors are broadly classified into two types: vane type and hero ring piston type. Below, the former will be mainly explained.

In the rotary compressor shown in Figs. 1 and 2, an engagement groove is formed in a rotor 2 fixed at rotation @1, and a vane 3 is engaged in each engagement 4 so as to be able to reciprocate and slide. has been done. In the illustrated example, four hard plates 73 are used, but two pieces may be used. The rotor 2 and the vanes are arranged in a space defined by a cylindrical gauging 4 and side plates 5 that close both end faces of the cylindrical gauging. The tip of the valley vane 3 is affected by centrifugal force due to rotation of the rotor 2 and each vane 4.
It is brought into sliding contact with the inner surface of the cylindrical casing 4 by the discharge pressure acting on the rear end surface. The axes of the rotor 2 and rotating shaft 1 are located at positions deviated from the center of the cylindrical casing 4, and both sides of the cylindrical casing 4 are closed by the side plates 5 as described above. There are four sealed spaces 6a to 6 with different volumes in the two matching spaces.
d is formed. A suction port (not shown) for sucking a mixed gas of compressed gas and lubricating oil is provided at a predetermined position of the cylindrical casing 4 or the side plate 5 so as to communicate with the space 6a in which the suction process is performed. A discharge port (not shown) is provided to communicate with the space 6d in which the discharge process is performed. Hereinafter, the spaces 6a to 6d will be collectively referred to as the compression space 6-. Figure 3 shows two inlets and two outlets t.
This is a rotary compressor called the G-shaped horn type.

The biggest problem in developing the above rotary compressor (Figures 1-3) for use in all car air conditioners is that compressors for automobiles are completely different from compressors for freezing and refrigerating food products, etc. The sliding conditions were extremely severe due to the round trip and frequent operation stoppages. Each company solves these problems using its own unique methods. ] The side surfaces of the rotor and side plates coated with oil, furan resin, carbon, graphite, etc. are smoothed by grinding to ensure smooth sliding. Increase the output of the attached oil pump so that the amount of oil discharged is sufficient.

Countermeasures such as changing the type of lubricant are known. According to the findings of the present inventors, compared to the compression space where the mixed gas of refrigerant and lubricating oil is filled with light, the contact surface between the rotor and the side plate is inherently difficult for lubricating oil to enter, and metal-to-metal contact is more likely to occur. It has been found that even if lubricating oil is once present on this contact surface, the lubricating oil tends to be returned to the compression space 6 due to the centrifugal force caused by the 1M1 rotation of the rotor, which makes it easy for the side plate and rotor to seize. .

Naturally, when the rotor rotates rapidly, that is, when the car accelerates rapidly, the centrifugal force and speed are generated and increased, which further increases the risk of seizure. Furthermore, if the rotary compressor is left unused for a long period of time, the lubricating oil interposed between the rotor 2 and the side plate 5, that is, the sliding surface, will flow out or the refrigerant will be absorbed by the oil, resulting in a significant drop in apparent viscosity. As a result, there is a high risk of seizure occurring at the start of operation. Furthermore, in order to take full advantage of the rotary compressor's small size and high performance, the lubrication system, including the oil pump, must be made smaller.
In this case, the question is how to achieve sufficient lubrication with a small amount of lubricating oil on the wide contact surface between the side grate and rotor, which has a Q much larger contact surface than the contact surface of the vane 7 cylinder. It's important.

(3) Purpose of the Invention The purpose of the present invention is to take measures against seizure by finishing the contact surface of a rotary compressor for a car air conditioner in a smooth and smooth surface condition.

(4) Structure of the Invention The rotary compressor of the present invention includes: a rotor fixed to a rotating shaft for transmitting rotational force, a cylindrical casing to which the rotating shaft is mounted, and a rotor fixed to both sides of the cylindrical casing and flat on both sides of the rotor. a pair of side plates in sliding contact with the carrying surface, and at least one of the side plate and the rotor is characterized in that it is provided with a large number of lubricating oil reservoir recesses in at least a part of the sliding contact area. .

The shape of the recess of the lubricating oil reservoir 9 may be any shape, such as circular, +n circular, rectangular, star-shaped, or irregular hole shape, as long as it can be used as an oil reservoir with an oil retaining effect. An example of a circular lubricating oil reservoir recess (hereinafter referred to as a pole indent) will be mainly described below.

First, the dimensions of the ball indent will be explained. The dimensions of the goal indent vary considerably depending on the viscosity of the lubricating oil and the sizes of the rotor and side plates, but are preferably between 0.5 and 4 mm thick, preferably about 3 tm.

If the diameter is less than 5mm, it will be difficult to manufacture and process, while if the diameter exceeds 3+mn, the sol effect cannot be ensured sufficiently, and the efficiency of the pump 1 may decrease.

In addition, if the depth of the ball indent is too shallow, the original effect will not be achieved, while if it is too deep, there will be almost no problem with the effect, but the processing cost will increase and it will be wasteful. Generally, the depth of the ball indentation is preferably 0.05 m or more.

Next, a method for forming ball indents and other recesses will be explained. First, the rotor and/or side plate are subjected to 0.8 to 1.6sK grinding as is generally done, and then subjected to 7-jot plast, mold transfer, barrel grinding, special lapping, electrical discharge machining, surface roughening etching, etc. Completely form the ball indentation of the desired size.

Mold transfer is useful for forming a relatively small number of ball indentations or for non-uniform array density, whereas other methods produce a significantly larger number of ball indentations - when forming ball indentations by shot planute. The conditions are to project a cut steel wire or steel ball with a diameter of 0.5 to 3 m+ at a normal projection speed onto a specified surface of a side plate made of aluminum, cast iron, etc. and/or a rotor made of aluminum, mild steel, carburized hardened steel, etc. It is done by doing. By doing this, the cross section shown in Fig. 4 is approximately symmetrical.
A large number of indents 10 are formed on a predetermined surface. These ball indents 10 have a shape that substantially retains the lubricating oil 12 by its surface tension.

Since a large number of single indents are formed on a predetermined surface, rotor 2 (first to third Seizure of the sliding surfaces of the side plate 5 (Figs. 1 to 3) is effectively prevented.

Next, the single indent formation area will be explained with reference to the fifth tooth and FIG. 6.

FIG. 5 is a perspective view showing an example of the rotor 2 fixed to the rotating shaft 1. As already explained, rotor 2 rotates @
It is rotated according to the running of own #Is through 11 pieces,
The outer circumferential surface 2a of the rotor is in contact with a light-filled compression space filled with a gas mixture (a mist-like mixture of refrigerant and lubricating oil) that is expanded or compressed by the stroke of the compressor. This gas mixture is supplied to the inlet 1 provided in the side plate 5.
4, the lubricating oil is fed through the contact surface between the side plate and the rotor, most of which flows into the compression space, undergoes predetermined expansion and compression, and then returns to the lubricating oil control mechanism from the outlet 15 of the side plate. .

A part of the gas mixture is press-fitted or flows into the contact surface between the side plate and the rotor from the inlet, another part is press-fitted into the compression space or the sliding contact surface between the side plate and the rotor, and still another part is forced into the rotor. Due to the rotation of Ail, the sliding surface moves. Some of the gas mixture flows in the axial direction of the rotor, but this is prevented by the shaft seal 9 (FIG. 1).

As above 7. - Two-gas mixed blade (seizing will not occur if the contact surface between the side plate and rotor is sufficiently distributed, but this condition has not been achieved at present, and only partially has been achieved. However, it is accompanied by pressure leakage due to the movement of the gas mixture from the high pressure area to the low pressure area.
There is a risk that the rotary compressor's original performance may deteriorate.

In order to effectively prevent such seizure, the contact surface between the side plate and the rotor should be tilted or a ball indentation should be formed on the entire surface of one side, so that the oil retaining effect of the goal indentation is advantageous for lubrication.

Furthermore, since the supply of lubricating oil near the gas mixture inlet is relatively good, the ball indentation may be formed in the side plate except for the inlet.

There is a slight difference in the effect depending on whether the ball indent is formed on the rotor ζ or on the side plate.

Because rotor 5 is receiving luck due to rotation,
The movement of the lubricating oil outward from the rotor surface is relatively large, and since the side plate is stationary, this movement is relatively small. When a ball indent is formed, these movements are suppressed by 11 on the Q-tar side and side delay (Gtli) due to its oil-retaining effect. however,
The lubricating oil in the peel indent on the rotor side is easily moved to the adjacent seven peel indents due to the action of centrifugal force. Side plate: In addition to either the pole indent on the rotor side or the pole indent on the rotor side, it is of course possible to form it as a single double sword.

If ball indents are formed at one-foot intervals on the outside of the rotor and/or side plate, that is, on the annular regions 2b and 5b extending into the compression space! Improved sealing performance for Samurai. An oil film with high surface tension tends to form around the ball indent 10 (FIG. 4), effectively narrowing the flow path of the gas mixture and preventing undesired leakage of the gas mixture from the high pressure side to the low pressure side. effectively reduce.

When such a ball indent is formed in the annular regions 2b and 5b, the ball indent acts as a trough location for lubricating oil and narrows the space through which the refrigerant flows, thereby further improving the sealing performance. The ball indentation on the rotor side is also effective in preventing seizure during startup.

The present invention can be implemented in various ways, such as by combining the above-mentioned ball indentation flare forming regions with the outside of the rotor and the inside of the side array, or vice versa.

In addition, the lubricating oil supply and discharge port is in the cylindrical cylinder 4 (Figures 1 to 3).
The present invention can also be practiced with a rotary contelesor formed in a.

Furthermore, the number of 9M indents formed per unit surface may be varied in the region of the side plates and/or the rotor.

(5) Effect The lubricating oil reservoir 9 recess according to the present invention prevents seizure and improves the sealing performance between the side plate and the rotor under severe lubrication conditions, especially under the operating conditions of the rotor IJ-compressor where metal contact is likely to occur. Improve.

[Brief explanation of drawings]

Figures 1 to 3 are conceptual cross-sectional views of the vane type rotary combination 7-nosers, Figure 4 is a conceptual diagram of the ball indent and the oil inside and on the four sides, and Figures 5 and 6 are conceptual cross-sectional views of the rotor. and a trunk view of the side plate. 1...lol&'++4+, 2...rotor, 3.
... Vane, 5... Side plate, 6... Compression space, 10... Ball indent. Patent applicant: Taiho Kogyo Co., Ltd. Patent application agent: Akira Aoki, patent attorney Kazuyuki Nishidate, patent attorney Takashi Murai Yuuyuki Yamaguchi, patent attorney

Claims (1)

[Claims] 1. A rotor fixed to a rotating shaft for transmitting rotational force,
A cylindrical casing on which a rotating shaft is mounted, and a pair of side plates fixed to both sides of the cylindrical casing and slidingly in contact with both flat side surfaces of the rotor, at least one of the side plates and the rotor being in sliding contact with the rotor. A rotary compressor characterized in that it is provided with a large number of lubricating oil sump recesses in at least some areas.