JPS5813117Y2 - Mitsupei Gata Atsushiyukuki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hermetic compressor incorporated in, for example, a room cooler, a refrigerator, etc., and particularly relates to an improvement of a blade spring in a rotary hermetic compressor.

In this type of hermetic compressor, the spring body that causes the blades to spring against the roller fitted into the eccentric large-diameter portion of the crankshaft is of the compression coil type, and is attached to the outer peripheral surface of the cylinder. It is arranged in a drilled recess.

As a result, the rigidity of the cylinder is reduced and the compressor cannot be made smaller.

The present invention was made in view of the above points, and the spring body that makes the blade spring is configured in an abbreviated shape with a coil part in the middle part, one end of which is the blade, and the other end is the axis of the crankshaft. By fixing each to the non-operating part on the sliding center line of the blade in the radial direction of the cylinder,
To provide a hermetic compressor which improves durability by reducing stress generated in a spring body, enables miniaturization of the compressor, and does not require reduction in rigidity of the cylinder since there is no need to provide four parts to the cylinder. The purpose is to

An embodiment of the present invention will be described below with reference to the drawings.

In the drawings, reference numeral 1 denotes a hermetic casing having an oil tank 2 which is divided into two lower halves, and a rotary electric compressor 3 is provided within the hermetic casing 1.

The electric compression device 3 is composed of an electric motor 4 and a compression device 5. A rotor 4a of the electric motor 4 is fitted into a stator 4b, and a crankshaft 6 that is integral with the rotor 4a is connected to a crankshaft 6 of the compression device 5. It is rotatably supported by an upper bearing 7 and a lower bearing 8.

A cylinder 9 is arranged between the upper bearing 7 and the lower bearing 8 to define a cylinder chamber 10.

An eccentric large diameter portion 6a is formed at a portion of the crankshaft 6 located within the cylinder chamber 10, and a roller 11 is loosely fitted into the eccentric large diameter portion 6a.

Further, the cylinder 9 has a slit 12 extending in the radial direction.
A blade 13 is slidably disposed in the slit 12.

The blade 13 is constantly urged radially inward by a spring 14.

Therefore, as shown in FIG. 2, the blade 13 passes through the cylinder 9 and is elastically pressed against the roller 11 by the elasticity of the bower 14.

The spring 14 has an approximately L-shape as a whole, and a coil portion 15 having at least a minus turn is formed at the bent portion thereof, and one end 14a of the spring 14 is connected to a notch provided at the rear end portion of the blade 13. The other end 14b is a lower bearing which is a non-operating part on the crankshaft 6 side of the blade rear end on the approximate blade sliding center line l in the radial direction of the cylinder 9 when viewed from the axial direction of the crankshaft 6. 8 are respectively connected to holes provided in the boss portions 8a.

Further, the spring body 14 is attached so that the axis of the crankshaft 6 is included in a virtual plane including the coil portion 15 and 14 a and 14 b connected thereto.

Therefore, as a special space for arranging the spring body 14, only a space corresponding to the wire diameter of the spring body is required in the radial direction and the vertical direction.

Further, the coil portion 15 is located in a space between the boss portion 8a of the lower bearing 8 and the inner wall of the casing 1.

Therefore, substantially no special space is required for arranging the spring body 14.

Therefore, when the electric motor 4 is driven, the crankshaft 6
The roller 7 fitted into the eccentric large diameter portion 6a compresses the refrigerant supplied from the supply pipe (not shown) in the cylinder chamber 10 in cooperation with the blade 13, and the compressed refrigerant is periodically It is discharged into the casing 1.

In the above embodiment, one end 14b of the spring 14 is connected to the boss portion 8b of the lower bearing 8, which is a fixed non-operating portion, but the end 14b is not limited to this and may be connected to the boss portion of the upper bearing. Furthermore, a mounting plate is provided on the lower bearing, the upper bearing, or the casing 1 that extends substantially on the blade sliding center line l in the radial direction of the cylinder 9 when viewed from the axial direction of the crankshaft 6, and one end 14b of the spring 14 is attached to the Of course, it may be fixed to a portion of the mounting plate located approximately at the sliding center line -H of the blade.

As described above, according to the present invention, the body for repelling the blade is configured in an abbreviated shape with a coil section in the middle, one end is located at the rear end of the blade, and the other end is directed in the axial direction of the crankshaft. Since each spring is connected to a non-operating part on the crankshaft side of the rear end of the blade on the blade sliding center line in the radial direction of the cylinder, the stress generated in the spring body can be reduced and durability can be improved. Can be done.

Moreover, the line of action of the force of the spring body and the sliding direction of the blade substantially match, and it is possible to prevent large stress from being applied to the side surface of the blade.

Furthermore, there is no need to arrange a coiled spring between the blade and the casing, and the spring body is mounted so that the crankshaft axis is included in the virtual plane that includes the coil and both ends connected to the coil part. By effectively utilizing the space inside the casing, it is possible to arrange the h-body, the casing can be made smaller, and the compressor itself can therefore be made smaller.

Furthermore, since there is no need to form a recess on the outer circumferential surface of the cylinder, the rigidity of the cylinder does not decrease.

[Brief explanation of drawings]

Fig. 1 is a partially sectional side view of the hermetic compressor according to the present invention;
FIG. 2 is a sectional view taken along the line A-A in FIG. 1. 1...Casing, 4...Electric motor,
4a... Rotor, 6... Crankshaft,
6a...Eccentric large diameter part, 7...Upper bearing, 8...Lower bearing, 9...Cylinder,
10... Cylinder chamber, 11... Roller, 13... Blade, 14... Spring,
l...Blade sliding center line.

Claims (1)

[Scope of utility model registration request] An eccentric large-diameter portion of a crankshaft rotatably mounted on the cylinder body, a roller fitted into the eccentric large-diameter portion, a blade disposed on the cylinder body so as to be slidable in the radial direction, and the blade. In the hermetic compressor, the spring body is formed in an abbreviated shape with a coil part in the middle part, and one end is connected to the rear end part of the blade. and the other end is connected to a non-operating part on the crankshaft side of the rear end of the blade on the approximate blade sliding center line in the cylinder radial direction when viewed from the axial direction of the crankshaft, and the coil part of the spring body and this A hermetic compressor, characterized in that the spring body is mounted so that the crankshaft axis is included in a virtual plane that includes the both ends connected to the coil portion.