JPH0752387Y2 - Hermetic rotary compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to the structure of a hermetic rotary compressor used in a refrigerant cycle.

[Prior Art] FIG. 3 is a cross-sectional view of a conventional hermetic rotary compressor shown in, for example, the Japan Society of Mechanical Engineers (60-606B).

In the figure, 1 is a rolling piston, 2 is fitted to the rolling piston 1, and the rotor 3 is shrink-fitted.
Alternatively, it is a press-fitted crankshaft. The rotor 3 and the stator 4 form an electric motor element 5.

6 is a compressor element constituted by the rolling piston 1 and the cylinder 7, 8 is an upper bearing that supports the crankshaft 2, 9 is a lower bearing that supports the crankshaft 2, and 10 is a balance with the eccentric weight of the crankshaft 2. The lower balance weight is provided at the lower end of the rotor 3 and 11 is the upper balance weight provided at the upper end of the rotor 3.

Next, the operation of the conventional hermetic rotary compressor will be described.

First, since the rotational force generated by the electric motor element 5 is transmitted to the rolling piston 1 via the crankshaft 2, the rolling piston 1 performs eccentric rotation along the inner wall of the cylinder 7. As a result, the volume of the space formed by the upper bearing 8 and the lower bearing 9 in the cylinder 7 and the rolling piston 1 changes, and the gas sucked therein is compressed and once discharged into the compressor container. Is
It is discharged to the outside from the pipe provided at the top.

[Problems to be Solved by the Invention] In the conventional hermetic rotary compressor, since the rotational force of the electric motor element is only directly transmitted to the compressor element, the rolling piston rotates to perform suction, compression and discharge. When the stroke is performed, it is easily affected by the increase or decrease of the load, and the rolling piston cannot be rotated at a constant speed accordingly.Therefore, there are problems such as increase of clearance volume and deterioration of volumetric efficiency. there were.

Therefore, the present invention was made in order to solve the above problems, and it is possible to rotate at a constant speed even if the load fluctuates, and as a result, the gap volume increases and the volume efficiency increases. It is an object to obtain a hermetic rotary compressor that does not cause a decrease.

[Means for Solving Problems] A hermetic rotary compressor according to the present invention includes an electric motor element,
In a hermetic rotary compressor having a compressor element that performs a compression action by the rotation of a rolling piston and a crankshaft that directly rotates from the electric motor element to the rolling piston, a flywheel provided on the crankshaft is The counterweight is provided at substantially the same position as the eccentric center of gravity and on the opposite side in the eccentric direction, and is located between the first and second bearings that support the crankshaft.

[Operation] In the present invention, since the flywheel provided on the crankshaft between the electric motor element and the compressor element rotates together with the rotation of the crankshaft, the inertial mass is increased and the load of the load is increased. The increase or decrease does not affect the rotation of the crankshaft.

[Embodiment] FIG. 1 is a sectional view showing a basic structure of a hermetic rotary compressor according to the present invention, and FIG. 2 is a sectional view showing an embodiment of a hermetic rotary compressor according to the present invention. .

In FIG. 1, 1 is a rolling piston, 2 is a crankshaft which is fitted into the rolling piston 1 and is shrink-fitted or press-fitted into a rotor 3, and the rotor 3 and the stator 4 are The electric motor element 5 is constituted by. 6 is a compressor element constituted by the rolling piston 1 and the cylinder 7, 8 is an upper bearing which constitutes a first bearing for supporting the crankshaft 2 at its intermediate portion, and 9 is a bearing for supporting the crankshaft 2 at its lower end portion. A lower bearing constituting a second bearing, 10 is a lower counterweight provided at the lower end of the rotor 3 for balancing the eccentric weight of the crankshaft 2, and 11
Is a counterbalance weight provided on the upper end of the rotor 3, and 12 is a flywheel provided on the crankshaft 2.

In the hermetic rotary compressor thus configured, the rotational force generated by the electric motor element 5 is transmitted to the rolling piston 1 via the crankshaft 2. Then, the rolling piston 1 eccentrically rotates along the inner wall of the cylinder by the rotational force transmitted. As a result, the upper bearing 8 and the lower bearing 9 in the cylinder and the rolling piston 1
The volume of the space formed by and changes, and accordingly the gas sucked into the space is compressed and discharged to the outside.

Here, since the flywheel 12 provided between the electric motor element 5 and the compressor element 6 rotates together with the rotation of the crankshaft 2 that transmits the rotation of the electric motor element 5 to the compressor element 6, the inertia moment Will increase. As a result, the fluctuation in the rotation of the crankshaft due to the fluctuation in the load is significantly reduced by the increase in the rotary inertia mass due to the flywheel 12.

Further, in the above basic configuration, only the case where the flywheel is provided between the electric motor element and the compressor element has been described, but as shown in the embodiment of FIG. By providing a counterweight 13 at the lower end on the opposite side, it is possible to balance the rotation.

In the embodiment shown in FIG. 2, a balance weight is provided at the lower end of the flywheel, and its position is set to the same horizontal position as the eccentric center of gravity of the crankshaft, or a position close to it, so that the force and moment are balanced. Therefore, the balance weights provided at the upper and lower ends of the stator shown in FIG. 1 can be eliminated, and by placing the balance weights between the upper and lower bearings, the load on the bearings can be reduced. become.

[Advantages of the Invention] As described above, according to the hermetic rotary compressor of the present invention, the flywheel provided on the crankshaft is located at substantially the same position as the eccentric center of gravity of the crankshaft and in the opposite eccentric direction. Since a balance weight is provided between the first and second bearings that are provided on the side and support the crankshaft, the forces and moments applied to the constituent members can be balanced, and the overall structure can be made compact. A simple structure can be achieved, and by placing the counterweight between the first and second bearings, the load on the bearings can be reduced and a highly reliable device can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing the basic structure of a hermetic rotary compressor according to the present invention, FIG. 2 is a sectional view showing an embodiment of a hermetic rotary compressor according to the present invention, and FIG. 3 is a conventional hermetic seal. It is a sectional view showing a rotary compressor. In the figure, 1 ... rolling piston, 2 ... crankshaft 3 ... rotor, 4 ... stator 5 ... motor element, 6 ... compressor element 7 ... cylinder, 8 ... upper bearing 9 ... Lower bearing, 10 …… Lower counterweight 11 …… Upper counterweight, 12 …… Flywheel. In the drawings, the same reference numerals and symbols indicate the same or corresponding constituent parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Susumu Kawaguchi 3-18-1 Ogashi, Shizuoka-shi, Shizuoka Mitsubishi Electric Corporation Shizuoka Plant (72) Inventor Takashi Yamamoto 3-18-1 Oka, Shizuoka-shi No. Mitsubishi Electric Co., Ltd. Shizuoka Works (56) Bibliographic Reference Showa 57-132086 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A hermetic rotary compressor having an electric motor element, a compressor element for performing a compression action by rotation of a rolling piston, and a crankshaft for directly rotating the electric motor element to the rolling piston. The provided flywheel has a counterweight that is provided at substantially the same position as the eccentric center of gravity of the crankshaft and on the opposite side in the eccentric direction, and that is located between the first and second bearings that support the crankshaft. A hermetic rotary compressor characterized by the following.