JPS59145391A - Closed-type electric-motor compressor - Google Patents

Abstract

PURPOSE:To aim at preventing vibration and noise from occurring, by providing such an arrangement that a surrounding plate for shielding an oil pump coupled to a rotary shaft from discharged fluid is arranged around a discharge valve and a discharge port which are positioned in lubrication oil in the bottom section of a closed casing. CONSTITUTION:A surrounding plate 19 for shielding an oil pump 20 coupled to a rotary shaft 4 from discharged fluid, is arranged around a discharge valve 17 and a discharge port 10 which are positioned in lubrication oil 21 in the bottom section of a closed casing 1. Compressed high pressure fluid is discharged into an internal space 19' defined by the surrounding plate 19 from the discharge port 10 after pressing and then opening the discharge valve 17 and the retainer plate 18. Since the lubrication oil is filled in the internal space 19', the high pressure fluid is discharged into the lubrication oil 21 so that pressure pulsation, in the high-pressure oil, which is transmitted to the closed casing 1 through a cylinder frame 7 to generate vibration incurring noise, is absorbed into the lubrication oil 21, thereby noise and vibration may be prevented from occurring.

Description

[Detailed Description of the Invention] [Object of the Invention] The present invention relates to the improvement of a hermetic electric compressor used in air conditioners, etc., and its purpose is to improve a hermetic electric compressor for use in air conditioners, etc. The purpose of the present invention is to provide a hermetic electric compressor.

This conventional hermetic electric compressor, which is the subject of improvement in the present invention, will be explained with reference to FIG. 1 is a closed container, 2 is a motor stator fixed to the inner wall of the container, 5 is a *motor rotor,
4 is a rotating shaft track, and 5 is a piston to which the rotating shaft 4 VC is fixed. 6 is.

The cylinder chamber is formed by a cylinder frame 7 fixed to the closed container 1, and both upper and lower sides thereof are sealed by seven-lunge type bearings 8.9, and the piston 5 rotates by sliding on the inner surface of the cylinder chamber. The high pressure side 6a of the cylinder chamber 6 communicates with a discharge chamber 11 formed by the lower bearing 9 and 772-12 through a discharge port 10 having a discharge valve (not shown) provided in the lower bearing 9. There is. 13 is the lower bearing 9
, a discharge fluid passage passing through the cylinder 7 frame 7 and the upper bearing 8, 14 a fluid suction pipe, and 15 a discharge pipe.

In the above structure, when the electric motor is driven, the piston 5 rotates to suck fluid from the suction pipe 14 into the cylinder chamber 6 and compress it. The compressed fluid enters the discharge chamber 11 through the discharge port 10, passes through the passage 13, is discharged into the closed container 1, and is discharged from the discharge pipe 15. By the way, in the above conventional structure, when the compressed fluid passes through the passage 16, the high pressure pulsations of the fluid propagate to the closed container via the cylinder frame and generate vibrations, which cause noise S. . The present invention aims to solve this problem.

[Structure of the Invention] The present invention has an electric motor and a compressor inside a closed container, and a piston fixed to the rotating shaft of the electric motor is connected to a cylinder frame, an upper bearing, and a lower bearing of the compressor fixed to the closed container. The fluid sucked into the cylinder chamber is compressed by sliding and rotating the inner wall of the cylinder chamber formed by the lower bearing r (7), and the compressed fluid is discharged from the lower bearing r (from the discharge port having a discharge valve provided therein to the sealed container). In a structure that discharges internally, the discharge valve and the discharge port are located in the lubricating oil at the bottom of the closed container, and there is an enclosure surrounding the lubricating oil that isolates the oil pump attached to the rotating shaft from the discharged fluid. This is a hermetic electric compressor characterized by a plate.

An embodiment of the invention will be described with reference to FIGS. 2 and 6. In the figure, 1 to 1o and 14.15 are the same as in FIG. 1, so their explanation will be omitted. Reference numeral 16 denotes a spherical notch provided in the cylinder frame 7 at the entrance on the cylinder chamber side of the discharge port 1o, which allows fluid compressed from the high pressure 91146a of the cylinder chamber to smoothly enter the discharge port 10. 17
1 is a discharge valve provided on the discharge side of the discharge port 10, and 18 is a holding plate thereof. Reference numeral 19 denotes a shroud plate attached to the lower bearing 9 so as to cover the circumference of the discharge valve 17 and the presser plate 1, and isolates the oil pump 20 attached to the rotating shaft 4 from the discharged fluid. 21 is lubricating oil. In FIG. 3, 22 is a partition vane that moves in and out of a sliding groove 26 provided in the cylinder frame 7 to divide the cylinder chamber 6 into a high pressure side j and a low pressure side.

[Effects of the Invention] Since the present invention has the above configuration, it has the following effects. The fluid sucked from the suction pipe 14 is compressed in the cylinder chamber 6, and the compressed high-pressure fluid pushes open the discharge valve 17 and its holding plate 18 from the discharge port 10, and flows into the interior surrounded by the shroud plate 19. Enter space 191.

Since this internal space 191 is filled with the lubricating oil 21, the high-pressure fluid ii is discharged into the lubricating oil 21, and the pressure pulsations of the high-pressure fluid are absorbed by the lubricating oil 21. The fluid discharged into the lubricating oil 21 is released into the closed container 1,
It is sent out from the discharge pipe 15. Since the shroud 19 blocks the high pressure fluid discharged into the lubricating oil 21 from the oil pump 20, the operation of the oil pump is not hindered.

In the conventional hermetic electric compressor shown in Fig. 8g1, when the fluid discharged into the muffler 12 passes through the passage 13, a vibration sound is generated due to the pressure pulsation of the fluid, but in the present invention, The fluid is discharged into the lubricating oil,
Since the pressure pulsations are absorbed by the lubricating oil, the drawbacks of the conventional hermetic electric compressor shown in FIG. 1 are overcome. Therefore, the present invention achieves the object of the invention.

[Brief explanation of the drawing]

Figure 1: Longitudinal cross-sectional view of a conventional hermetic electric compressor No. 2N: Longitudinal cross-sectional view of the hermetic electric compressor of the present invention Figure 3 2 Exploded perspective view of Figure 2 1... Sealed container, 2- ... Electric motor stator, 6... Electric ivl rotor, 4... Rotating shaft, 5... Piston,
6... Cylinder chamber, 7... Cylinder frame, 8...
... Upper bearing, 9... Lower bearing, 10... Discharge port,
14... Suction pipe, 15... Discharge pipe, 16... Notch, 17... Discharge valve, 18... Holding plate, 19... Shrouding plate, 20... Oil pump, 21... ...Lubricating oil, 2
2... Partition vane, 23... Sliding groove Figure 1 Figure 2

Claims (1)

[Claims] An electric motor and a compressor are provided inside an airtight container, and a piston fixed to the rotating shaft of the electric motor is attached to an inner wall of a cylinder chamber formed by a cylinder frame of the compressor fixed to the airtight container, an upper bearing, and a lower bearing. A structure in which the fluid sucked into the cylinder chamber is compressed by sliding and rotating, and the compressed fluid is discharged into the inside of the sealed container from a discharge port having a discharge valve provided in the lower bearing. and the discharge port is located in the lubricating oil at the bottom of the sealed container, and a shroud is provided around the discharge port to isolate the oil pump attached to the rotating shaft from the discharged fluid. Hermetic electric compressor