KR-20260062282-A - Shaft device of scroll type electric compressor capable of reducing noise

KR20260062282AKR 20260062282 AKR20260062282 AKR 20260062282AKR-20260062282-A

Abstract

The present invention relates to a shaft device for a scroll-type electric compressor, and more specifically, to a shaft device for a scroll-type electric compressor capable of reducing noise generated during the rotation of a shaft that rotates a rotating scroll. The shaft device of a scroll-type electric compressor according to the present invention is coupled to enable rotation of the rotational scroll of a scroll-type electric compressor, which comprises a fixed scroll and a rotational scroll that rotates in engagement with the fixed scroll to form a compression chamber. Here, the shaft device includes a shaft, an eccentric pin, a balancing means, and a cushioning member. The shaft rotates around a central axis. The eccentric pin is coupled to protrude from one end of the shaft, eccentrically from the central axis. The balancing means comprises a bushing part and a balancing part. The bushing part is inserted into the rotational scroll to support the rotational scroll with a bearing, and the eccentric pin is inserted into the eccentric pin to support it so as to rotate. The balancing part is coupled to one side of the bushing part so as to be positioned at a certain distance in the radial direction from one side of the outer circumference of one end of the shaft, so as to allow relative rotation only within a small angle with respect to the shaft. The above cushioning member is mounted on at least one of the outer surface of one end of the shaft and the inner surface of the balancing member facing the outer surface, so that the balancing member can reduce noise when it rotates around the eccentric pin and collides with the outer surface of one end of the shaft.

Inventors

정재령
한상욱
임종학

Assignees

지엠비코리아 주식회사

Dates

Publication Date: 20260507
Application Date: 20241029

Claims (2)

In a shaft device of a scroll-type electric compressor having a fixed scroll and a rotating scroll that rotates in engagement with the fixed scroll to form a compression chamber, the rotating scroll is coupled to be rotatable, A shaft rotating around a central axis, and An eccentric pin coupled to be eccentrically offset from the central axis and protruding at one end of the shaft, and A balancing means comprising a bushing portion inserted into the aforementioned slewing scroll to support the slewing scroll with a bearing and having the aforementioned eccentric pin inserted therein to be supported so as to be rotatably supported on the aforementioned eccentric pin, and a balancing portion coupled to one side of the bushing portion to be positioned at a certain distance radially spaced from one side of the outer circumference of one end of the shaft so as to be able to rotate relatively only within a small angle with respect to the shaft, A shaft device of a scroll-type electric compressor characterized by including a cushioning member mounted on at least one of the outer surface of one end of the shaft and the inner surface of the balancing part facing the outer surface, so as to reduce noise when the balancing part rotates around the eccentric pin and collides with the outer surface of one end of the shaft.
In paragraph 1, The shaft device of a scroll-type electric compressor is characterized in that the above-mentioned cushioning member is formed as a cushioning ring of an elastic material and is mounted on the outer surface of one end of the shaft.

Description

Shaft device of scroll type electric compressor capable of reducing noise The present invention relates to a shaft device for a scroll-type electric compressor, and more specifically, to a shaft device for a scroll-type electric compressor capable of reducing noise generated during the rotation of a shaft that rotates a rotating scroll. FIGS. 5 and 6 are conventional scroll-type electric compressors. The conventional scroll-type electric compressor includes a shaft (11), a fixed scroll (13), a rotating scroll (15), a main housing (17), a ring (19), and a pin (21). The shaft (11) rotates by the operation of a motor, and an eccentric pin (70) is inserted at one end of the shaft (11) so as to protrude at a certain distance from the central axis. The fixed scroll (13) is fixed inside the case (10). The pivot scroll (15) engages with the fixed scroll (13) to form a compression chamber (33) and is mounted to rotate around the eccentric pin (70) of the shaft (11). When the shaft (11) rotates, the pivot scroll (15) moves by the eccentric pin (70) and performs a pivoting motion. When the pivot scroll (15) performs a pivoting motion, the refrigerant inside the compression chamber (33) is compressed. As explained above, when the shaft (11) rotates, the swivel scroll (15) must perform a swivel motion instead of a rotational motion. To prevent the swivel scroll (15) from performing a rotational motion, a groove is formed on the back of the swivel scroll (15) and a plurality of rings (19) are inserted therein. Additionally, a pin (21) is press-fitted and fixed to the main housing (17) so that one end is inserted into the ring (19). When the shaft (11) rotates, the swivel scroll (15) cannot rotate due to interference with the pin (21) and can only perform a swivel motion. Here, the ring (19) is inserted into the groove with a certain tolerance so that it can rotate inside the groove. This is because if the ring (19) cannot rotate, the frictional force with the pin (21) increases, or noise or wear occurs. The main housing (17) surrounds the rotating scroll (15) and supports the rotating scroll (15). At this time, a back pressure chamber (31) and a low pressure chamber (35) are formed inside the main housing (17). The back pressure chamber (31) is on the inner side of the rotating scroll (15), and the low pressure chamber (35) is on the outer side of the rotating scroll (15). Refrigerant is introduced from the outside into the low-pressure chamber (35), and the refrigerant is supplied from the low-pressure chamber (35) to the compression chamber (33). In the compression chamber (33), the rotating scroll (15) rotates to compress the refrigerant introduced from the low-pressure chamber (35). The compressed refrigerant is discharged to the outside. At this time, because the pressure in the compression chamber (33) is high, the rotating scroll (15) attempts to detach from the fixed scroll (13). To prevent this, a portion of the compressed refrigerant discharged from the compression chamber (33) is supplied to the back pressure chamber (31). The back pressure chamber (31) serves to press the rotating scroll (15) against the fixed scroll (13) using the back pressure of the contained compressed refrigerant. FIG. 1 is an enlarged view of a portion of the cross-section of a scroll-type electric compressor equipped with an embodiment of a shaft device according to the present invention. FIG. 2 is a perspective view of a part of a scroll electric compressor equipped with an embodiment of a shaft device according to the present invention. FIG. 3 is a plan view of FIG. 1 seen from the direction XX. FIG. 4 is an exploded perspective view of the shaft device of FIG. 1. FIG. 5 is a cross-sectional view of a conventional scroll-type electric compressor, FIG. 6 is an example of the operation of the balancing means in a cross-section viewed from BB of FIG. 5. An embodiment of a shaft device according to the present invention is described using FIGS. 1 to 4 with reference to the scroll-type electric compressor shown in FIGS. 5 and 6. Figure 1 is an enlarged view of the part corresponding to "C" of a scroll-type electric compressor as in Figure 5. The shaft device according to the present invention includes a shaft (11), an eccentric pin (70), a balancing means (90), and a cushioning member (94). The shaft (11) rotates around the central axis. The eccentric pin (70) is coupled to be eccentric from the central axis of the shaft (11) and protrude from one end (11a) of the shaft (11). The balancing means (90) is equipped with a bushing part (91) and a balancing part (93). The bushing part (91) is inserted into the pivot scroll (15) to support the pivot scroll (15) with a bearing, and the eccentric pin (70) is inserted and supported so as to rotate on the eccentric pin (70). The balancing part (93) serves to balance the weight when the shaft (11) rotates. To this end, the balancing part (93) is coupled to one side of the bushing part (91) so as to