JPH0138311Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an apex sealing device for a rotary compressor used as a compressor for vehicle air conditioning.

<Prior art> As a conventional apex seal lubrication device of this type, for example, as described in Japanese Patent Application Laid-Open No. 55-98689, an apex seal is retracted from the tip of a vane held by a rotor. The apex seal can be attached freely, and the apex seal is biased to protrude by a spring, etc., and the tip surface of the apex seal is made into a cylindrical surface, thereby creating a seal between the inner diameter of the cylinder and the vane. There is something.

<Problems to be solved by the invention> However, in the conventional example in which the apex seal is urged to protrude from the tip of the vane and the tip is held in pressure contact with the cylinder inner diameter, the cylinder inner diameter Although the surface angle of the apex seal changes, the angle of the apex seal does not change, resulting in poor sealing between the two, which may cause gas leakage. In other words, since the rotor is rotated at an eccentric position within the cylinder, the straight line connecting the center of rotation of the rotor and the position of contact with the apex seal on the inside diameter of the cylinder (the normal line of the rotor) and the surface of the inside diameter of the cylinder The intersection angle with the rotor changes as the rotor rotates. For this reason, in conventional apex seals with a fixed angle, no matter what shape the tip surface (sliding surface) is, the apex seal and cylinder inner diameter may differ depending on the rotational phase of the rotor. There was a problem that the sealing performance between the parts may be impaired.

The present invention was developed in view of these circumstances, and aims to improve the sealing performance of the apex seal by maintaining the relative relationship between the apex seal and the cylinder inner diameter as specified regardless of the rotational phase of the rotor. The purpose is to

<Means for solving the problem> In order to achieve this purpose, the present invention includes a cylindrical rotor that is pivotally supported at an eccentric position within a cylindrical cylinder, and a rotor that can be retracted and retracted from the rotor in the diametrical direction. a plurality of vanes attached to the cylinder, an apex seal joined to the tip of the vane so as to be relatively rotatable with a cylindrical surface along the axial direction of the rotor, and a side plate covering the end surface of the cylinder. ing. While the apex seal is brought into constant surface contact with the inner diameter of the cylinder, a suction port is formed in the side plate, and the cylindrical surface is positioned in a portion where it can overlap with the suction port, and the cylindrical surface is positioned in a portion where it can overlap with the suction port, and The present invention is characterized in that a lubrication groove along the cylindrical surface of at least one of the vane or the apex seal is formed on the cylindrical surface of the vane or the apex seal.

<Operation> This improves sealing performance by rotating the apex seal attached to the tip of the vane to follow the inner diameter of the cylinder, and also introduces the lubricating oil contained in the refrigerant into the lubricating groove together with the refrigerant. The joint surface between the vane and the apex seal (cylindrical surface)
lubrication.

<Example> Hereinafter, an example of the present invention will be described based on the accompanying drawings.

In the figure, a housing 1 houses a cylindrical cylinder 2 and a side plate 3 that closes both end faces of the cylinder 2, and a rotor 5 is pivotally supported on the side plate 3 via a bearing 4. ing. The rotor 5 is pivotally supported at an eccentric position within the cylinder 2, and is driven to rotate by an external drive source (for example, an automobile engine) not shown.

Further, two vanes 6 extending along the diameter direction of the rotor 5 are slidably attached to the rotor 5 so as to be perpendicular to each other, and an apex seal 7 is attached to each tip of the vane 6. ing. Then, this apex seal 7 is attached to the cylinder 2.
When the rotor 5 rotates, the refrigerant in the suction chamber 9 is sucked into the pump chamber 10 through the suction port 8 provided in the side plate 3.
0 refrigerant is discharged into the delivery chamber 12 via the delivery valve 11. 13
14 is a connection port for a suction pipe, and 14 is a connection port for a discharge pipe. There is no need to explain in detail that it communicates with the connection port 14.

In the present invention, the tip surface of the vane 6 is a recessed cylindrical surface 15 centered on a straight line parallel to the axial direction of the rotor 5. By forming the back surface of the apex seal 7 (the surface that contacts and engages the vane 6) with a protruding cylindrical surface 16 having the same radius as the cylindrical surface 15, the apex seal 7 is guided by using these cylindrical surfaces 15 and 16 as a guide. The seal 7 can be rotated.

Further, the cylindrical surfaces 15 and 16 are connected to the side plate 3.
The vane 6 is positioned in a portion overlapping with the suction port 8 formed in the suction port 8, and a lubricating groove 17 along the axial direction of the rotor 5 is recessed in the center of the cylindrical surface 15 of the vane 6. When the lubricating groove 17 is rotated to the port 8 position, the end of the lubricating groove 17 opens into the suction port 8.

In the rotary compressor configured as described above, when the rotor 5 rotates, the refrigerant introduced into the suction chamber 9 through the suction pipe passes through the suction port 8 and into the pump chamber 10.
It is gradually compressed as the rotor 5 rotates, and is finally discharged into the delivery chamber 12 via the delivery valve 11. Incidentally, since this is the same as the conventional one, detailed explanation thereof will be omitted.

Furthermore, when the rotor 5 rotates and the vanes 6 move, the angle formed by the vanes 6 and the inner diameter of the cylinder 2 changes accordingly. However, since the apex seal 7 that seals between the tip of the vane 6 and the inner diameter of the cylinder is rotatably attached to the vane 6 using the cylindrical surfaces 15 and 16 as guides, the apex seal 7 does not follow the inner diameter of the cylinder. The apex seal 7 rotates. Therefore, the relative angle between the cylinder inner diameter and the apex seal 7 is maintained at a predetermined value under any condition, so that the sealing performance of the apex seal 7 is improved and gas leakage is avoided.

On the other hand, during the suction stroke in which the vane 6 rotates to the suction port 8 position, the refrigerant in the suction chamber 9 flows into the pump chamber 10 via the suction port 8, but at this time, the refrigerant enters the lubrication groove 17. There will also be an inflow. Further, this refrigerant contains an appropriate amount of lubricating oil, so that the joint surfaces (cylindrical surfaces 15, 16) between the vanes 6 and the apex seals 7 are sufficiently lubricated. Therefore, the joint surfaces 15 and 16 can be lubricated without providing a complicated lubricating oil supply path. It goes without saying that the contact portion between the apex seal 7 and the inner diameter of the cylinder is lubricated by lubricating oil contained in the refrigerant.

In the above embodiment, the cylindrical surface 15 at the tip of the vane 6
Although the lubrication grooves 17 are formed on the cylindrical surface 16 of the apex seal 7, the lubrication grooves may be provided on the cylindrical surface 16 of the apex seal 7, or on both sides.

<Effects of the invention> As explained above, according to the invention, an apex seal is rotatably attached to the tip of a vane that rotates with the rotor via a cylindrical surface, and this apex seal is slidably attached to the inner diameter of the cylinder. As the rotor rotates, the apex seal rotates to follow the inner diameter of the cylinder, increasing the stability of the apex seal.
Gas leakage is avoided. In addition, by forming a lubricating groove on the cylindrical surface that is the joint surface between the vane and the apex seal, the refrigerant containing lubricant can be introduced and stored at the joint surface, so it is possible to avoid complex lubricating oil. The joint surface between the vane and the apex seal can be lubricated without providing a supply path.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a sectional view taken along the line 1 in FIG. 1, and FIG. 3 is an enlarged sectional view of the main parts. 2...Cylinder, 3...Side plate, 5...
... Rotor, 6 ... Vane, 7 ... Apex seal, 8 ... Suction port, 15, 16 ... Cylindrical surface, 17 ... Lubrication groove.

Claims (1)

[Scope of utility model registration request] A cylindrical rotor pivotally supported at an eccentric position within a cylindrical cylinder, a plurality of vanes attached to the rotor so as to be retractable in the diametrical direction, and a cylinder extending along the axial direction of the rotor at the tip of the vane. The apex seal includes an apex seal that is relatively rotatably joined with a surface, and a side plate that covers the end surface of the cylinder, and the apex seal is always in surface contact with the inner diameter of the cylinder, while the side plate is in contact with the inner diameter of the cylinder. A suction port is formed, the cylindrical surface is located at a portion where it can overlap with the suction port, and a lubrication groove along the axial direction of the rotor is formed on the cylindrical surface of at least one of the vanes or the apex seal. Features apex seal device for rotary compressor.