JPS5922306Y2 - Lubricating device for hermetic electric compressor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lubricating device for a hermetic electric compressor, and aims to improve lubricating characteristics for the sliding portion of a compression element with a simple configuration.

Conventionally, in a hermetic electric compressor in which an electric compressor body consisting of a compression element at the top and an electric element at the bottom is arranged and housed in a closed container with lubricating oil stored at the bottom, the rotating shaft of the electric compressor body An eccentric pump mechanism sucks up lubricating oil from the lower end of the crankshaft to lubricate each sliding part of the upper compression element.

As shown in FIG. 5, the inner bottom of the airtight container 1 has a stopper function to withstand the impact of the electric compressor body and to prevent dust (slatch) etc. that accumulate inside the container from being sucked up together with the lubricating oil 2. In order to achieve this, a cylindrical cup body 17 is provided to receive the lower end portion 18 of the rotating shaft, and the cup body has horizontal holes 21, 21...
... has been established.

During actual operation, the lubricating oil that has flowed into the cylindrical cup body 17 from the side hole 21 is stirred along the inner wall of the cylindrical cup body 17 by centrifugal force due to the rotation of the lower end portion 18 of the rotating shaft. It will be in the shape of closing the horizontal hole 21 of.

In the case of the conventional example in which the horizontal holes 21, 21, . As a result, the flow of oil from the lower end portion 18 of the rotating shaft also worsens.

Also, the flow velocity (1) of the rotating lubricating oil is maximum near the oil surface and minimum at the bottom, considering the shape of the lower end 18 of the rotating shaft (conical shape narrowing downward).

This proposal has been made in view of the above points, and the embodiment shown in the drawings will be described below.

Reference numeral 1 denotes a closed container in which lubricating oil 2 is stored at the bottom. Inside the container, there is an electric compressor body 6, which is constructed by mounting a compression element 4 on the upper part of a support frame 3 and an electric element 5 on the lower part. They are arranged and housed via a support device 7.

The compression element 4 includes a piston 9 connected to and driven by the crank rotation shaft 8 of the electric element 5, a cylinder 10 on which the piston slides, and a cylinder head mounted on the end face of the cylinder via a valve plate 11. It consists of 12.

The electric element 5 also includes a stator 14 having a winding 13;
The rotor 16 is press-fitted onto the crank rotation shaft 8 via a spacer 15.

Reference numeral 17 denotes a bottomed cylindrical cup body provided at the center of the bottom surface of the sealed container 1 to receive the lower end 18 of the crank rotation shaft 8, and the opening of the cup body is provided with the lower end of the spacer 15. Opposing flange portions 19 are formed, and oval horizontal holes 20.degree. 21 are bored in the upper and lower sides of the flange portions, respectively.

The upper horizontal hole 20 is a hole exclusively for oil discharge, and the lower horizontal hole 21 is a hole exclusively for oil suction.

That is, during operation when the crank rotating shaft 8 is driven and rotated by the electric element 5, the lubricating oil in the cylindrical cup body 17 is rotated by centrifugal force, but the oil in the upper part, where the flow rate is fastest, passes through the upper horizontal hole 20. The lubricating oil flows out of the cylindrical cup body 17 and is instead constantly replenished into the cylindrical cup body 17 through the lower horizontal hole 21.

As a result, as shown in FIG.
Sufficient lubricating oil is pumped up by the eccentric pump mechanism 8, and the lubricating parts are well supplied to each sliding part.

Further, as shown in the embodiment shown in FIG. 3, if the upper and lower horizontal holes 20 and 21 of the cylindrical cup body 17 are slightly inclined in the tangential direction by pressing or the like to form oil guide portions 23 and 24, the cylindrical cup body 17 Inflow and outflow of lubricating oil can be performed more smoothly.

As described above, the present invention relates to a hermetic electric compressor in which an electric compressor body including a compression element and an electric element is disposed and housed in a closed container in which lubricating oil is stored at the bottom. A cylindrical cup body having a flange for receiving the lower end of the rotating shaft of the cup body is provided, and horizontal holes inclined inwardly are bored vertically in the cup body, so that lubricating oil can flow into the cylindrical cup body. Oil flows out smoothly, and oil rising from the lower end of the rotating shaft is greatly improved.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional side view of the main part of a hermetic electric compressor equipped with the oil supply system of the present invention, Fig. 2 A and port are a side view of the main part of a different embodiment, and Fig. 3 A and 9 are a side view of the main part of a different embodiment. FIG. 4 is a side view of the main part of the example and its A-A and B-B sectional views, FIG. 4 is a side view of the main part of the conventional example corresponding to FIG. 2, and FIG. 5 is the main part of the conventional example showing the relationship with flow velocity. The partial sectional view and FIG. 6 are performance comparison test charts of the conventional example and the present example when the oil temperature is constant (70°C). 1... Airtight container, 2... Lubricating oil, 8.
...Crank rotating shaft, 18...Lower end,
17...Tubular cup body, 20°21...
- Upper and lower horizontal holes.

Claims (2)

[Scope of utility model registration request] (1) In a hermetic electric compressor in which an electric compressor body including a compression element and an electric element is arranged and housed in a hermetically sealed container with lubricating oil stored at the bottom, the rotating shaft of the electric compressor body is located at the bottom of the hermetically sealed container. 1. A refueling device for a hermetic electric compressor, comprising a cylindrical cup body having a flange for receiving a lower end portion, and horizontal holes bored vertically in the cup body. (2) An oil supply device for a hermetic electric compressor, characterized in that the inner opening of the cup body is inclined.