JPH0640949Y2 - Rotary compressor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rotary compressor suitable for use as a refrigerant compressor of an automobile air conditioner or the like.

2. Description of the Related Art In recent years, fuel efficiency competition in automobiles has been striking, and the high efficiency of the engine naturally contributes largely to the weight reduction of the vehicle itself. That is, as the whole body is made thinner and made plastic, various accessories are becoming smaller and lighter.

On the other hand, due to auxiliary equipment such as turbochargers and DOHC, the engine tends to have higher output and higher speed.

Against this background, refrigerant compressors used for air conditioning of automobiles are becoming smaller and lighter, and further, higher speeds are required to follow the maximum rotation speed of the engine. In order to meet these demands, a reciprocating refrigerant compressor called a swash plate type is being changed to a rotary type compressor.

However, at present, rotary type compressors have many features such as small size, light weight, and quietness, but have a large weight ratio to volume compared to swash plate type compressors. ing.

In a rotary compressor that requires high processing accuracy and appropriate clearance design, the change in clearance due to the temperature rise of members is an important issue that determines the durability limit together with the efficiency of the compressor. Material selection,
A method of fastening members is required.

An example of the above-described conventional rotary compressor will be described below with reference to the drawings.

FIG. 3 and FIG. 4 show an example of a conventional rotary compressor, in which a rotor 1 made of an iron-based material is provided with a plurality of slots 2 in a radial pattern, and vanes 3 project and retract therein. Glide freely. The rotor 1 is rotatably supported by a front plate 4 made of an aluminum material and a rear plate 5 made of an aluminum material via a bearing (not shown).
Reference numeral 6 denotes a cylinder made of an iron-based material having a cylindrical inner wall, which is eccentrically arranged with respect to the rotor 1 and forms a minute gap 7 at a position where the rotor 1 comes closest to the inner wall of the cylinder 6, and both end faces thereof have the front plate. 4 and rear plate 5
Are closed and fastened with bolts 8.

The operation of the rotary compressor configured as described above will be described below.

When the rotor 1 rotates counterclockwise upon receiving power transmission from a drive source (not shown) such as an engine,
The low-pressure refrigerant flows into the working chamber 12 through the suction port 11, and the rotor 1
The high-pressure refrigerant compressed in accordance with the rotation of (1) pushes up the discharge valve 14 from the discharge port 13 and communicates with the discharge port 15.

Problems to be Solved by the Invention However, in the above-mentioned configuration, when the compressor is assembled, the front plate 4, the rear plate 5, the cylinder 6 are set to the bolts 8 after being set to an appropriate value (usually 10 to 20 μm). The minute gap 7 secured by tightly tightening with the compressor has a complicated temperature distribution (usually 0 to 150
Front plate 4, rear plate 5,
Due to the difference in the amount of thermal deformation of the cylinder 6, the difference in the coefficient of thermal expansion between the aluminum-based material and the iron-based material, and the variation in the tightening force of the bolt 8 that suppresses the deformation and displacement of these members, the initial stage during operation is It changed with respect to the set value and reduced the reliability and performance of the compressor.

That is, when the minute gap 7 is reduced, the cylinder 6 and the rotor 1 are brought into metal contact with each other, and the abrasion powder enters the rotor side, causing problems such as abnormal wear and seizure.

In view of the above problems, the present invention provides a rotary compressor having a simple structure and compensating for the above-mentioned drawbacks.

Means for Solving the Problems In order to solve the above problems, the rotary compressor of the present invention has a small gap formed between the inner wall of the cylinder made of an iron-based material and the outer peripheral surface of the rotor, where the cylinder and the rotor are closest to each other. A pin for preventing relative displacement between the joint surface of the cylinder and the front plate and the joint surface of the cylinder and the rear plate is provided in the vicinity.

Effect The present invention has the above-described structure to increase or decrease the minute gap 7 due to the difference in the thermal deformation amount of each member during the operation of the compressor and the variation in the tightening force due to the bolts that suppress the thermal deformation amount. By providing a fixing pin for preventing relative displacement of the joint surfaces in the vicinity of the minute gap, the origin of thermal deformation of the cylinder and both plates can be set to the center of the fixing pin, and the thermal deformation of each member can be prevented. The direction is forcibly regulated, the optimum minute gap set during assembly is maintained even during operation, and smooth operation can be performed without problems such as abnormal wear seizure as in the past.

Embodiment A rotary compressor according to an embodiment of the present invention will be described below with reference to FIGS. 1 and 2 of the accompanying drawings.
In the figure, components having the same effects as those of the conventional rotary compressor are designated by the same reference numerals and the description thereof will be omitted.

In FIGS. 1 and 2, reference numeral 10 penetrates through the joint surface between the front plate 4 and the rear plate 5 made of an aluminum material and the cylinder 6 made of an iron material, and the rotor 1 comes closest to the inner wall of the cylinder 6. This is a ferrous metal fixing pin provided in the vicinity of the minute gap 7 at a location.

The operation of the rotary compressor configured as described above will be described below.

As mentioned above, the compressor exhibits a complicated temperature distribution during operation,
The temperature of each member is different. Further, since both side plates 4 and 5 are made of an aluminum material and the cylinder 6 is made of an iron material, the coefficient of thermal expansion is different. As a result, each member
Thermal deformation occurs depending on the temperature and the coefficient of thermal expansion at each position and the magnitude of the axial force of the tightening bolts that fix the plate and the cylinder. Therefore, at the joint between the cylinder 6, the front plate 4, and the rear plate 5, Relative displacement occurs and the minute gap 7 changes, but if the fixing pin 10 is provided in the vicinity of the minute gap 7 as in the present embodiment, thermal deformation of the front plate 4, the rear plate 5, and the cylinder 6 can be prevented. The origin is the fixed pin 10, and the increase or decrease of the minute gap 7 can be prevented.

In the embodiment, the fixing pin 10 is the two pins 10 that fix the front plate 4 and the cylinder 6, and the rear plate 5 and the cylinder 6, respectively, but the fixing pin 10 penetrates the cylinder 6. It may be one fixed pin.

As described above, according to the present invention, the joint surface between the cylinder and the front plate and the cylinder and the rear plate are formed in the vicinity of the minute gap formed at the portion where the outer circumference of the rotor is closest to the inner wall of the cylinder. By providing a fixing pin that prevents relative displacement of the joint surfaces, the origin of thermal deformation of each component can be placed at the center of the fixing pin, and thermal deformation can be restricted in the direction in which the minute gap expands. It is possible to provide a compressor with excellent durability, which can prevent contact with the inner wall, and is extremely useful for reducing the weight of the compressor by making the member aluminum.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are vertical and horizontal sectional views of a rotary compressor according to an embodiment of the present invention, and FIGS. 3 and 4 are vertical sectional views of a conventional rotary compressor. It is a side view and a side view. 1 ... Rotor, 2 ... Slot, 3 ... Vane, 4 ...
... front plate, 5 ... rear plate, 6 ... cylinder, 7 ... top clearance, 8 ... fixing bolt,
10 ... Fixing pin.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshio Matsuda 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-57-148095 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A cylinder made of an iron-based material having a cylindrical inner wall surface, a rotor arranged inside the cylinder and forming a minute gap at a portion where a part of the outer periphery of the cylinder is closest to the inner wall of the cylinder. A vane that is inserted into and retracted from a vane slot provided in a rotor, a front plate and a rear plate made of an aluminum material that closes both ends of the cylinder to form a compression chamber inside, and a portion near the minute gap. And a fixing pin for preventing relative displacement of a joint surface between the cylinder and the front plate and a joint surface between the cylinder and the rear plate.